1 # SOME DESCRIPTIVE TITLE
2 # Copyright (C) YEAR Free Software Foundation, Inc.
3 # This file is distributed under the same license as the PACKAGE package.
4 # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
9 "Project-Id-Version: PACKAGE VERSION\n"
10 "POT-Creation-Date: 2012-05-28 07:17+0900\n"
11 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
12 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
13 "Language-Team: LANGUAGE <LL@li.org>\n"
16 "Content-Type: text/plain; charset=CHARSET\n"
17 "Content-Transfer-Encoding: 8bit\n"
20 #: build/C/man3/bsd_signal.3:23
26 #: build/C/man3/bsd_signal.3:23 build/C/man2/getitimer.2:7
32 #: build/C/man3/bsd_signal.3:23 build/C/man2/eventfd.2:21 build/C/man2/getitimer.2:7 build/C/man3/gsignal.3:25 build/C/man2/kill.2:44 build/C/man2/killpg.2:40 build/C/man2/pause.2:30 build/C/man2/prctl.2:48 build/C/man3/profil.3:28 build/C/man3/psignal.3:28 build/C/man3/raise.3:27 build/C/man2/rt_sigqueueinfo.2:23 build/C/man2/sgetmask.2:24 build/C/man2/sigaction.2:45 build/C/man2/sigaltstack.2:25 build/C/man7/sigevent.7:24 build/C/man3/siginterrupt.3:29 build/C/man2/signal.2:34 build/C/man7/signal.7:44 build/C/man2/signalfd.2:19 build/C/man3/sigpause.3:23 build/C/man2/sigpending.2:27 build/C/man2/sigprocmask.2:27 build/C/man3/sigqueue.3:26 build/C/man2/sigreturn.2:27 build/C/man3/sigset.3:24 build/C/man3/sigsetops.3:29 build/C/man2/sigsuspend.2:27 build/C/man3/sigvec.3:24 build/C/man3/sigwait.3:24 build/C/man2/sigwaitinfo.2:23 build/C/man3/sysv_signal.3:23 build/C/man2/timer_create.2:29 build/C/man2/timer_delete.2:23 build/C/man2/timer_getoverrun.2:23 build/C/man2/timer_settime.2:23 build/C/man2/timerfd_create.2:20 build/C/man2/tkill.2:29 build/C/man2/wait.2:50 build/C/man2/wait4.2:34
34 msgid "Linux Programmer's Manual"
38 #: build/C/man3/bsd_signal.3:24 build/C/man2/eventfd.2:22 build/C/man2/getitimer.2:8 build/C/man3/gsignal.3:26 build/C/man2/kill.2:45 build/C/man2/killpg.2:41 build/C/man2/pause.2:31 build/C/man2/prctl.2:49 build/C/man3/profil.3:29 build/C/man3/psignal.3:29 build/C/man3/raise.3:28 build/C/man2/rt_sigqueueinfo.2:24 build/C/man2/sgetmask.2:25 build/C/man2/sigaction.2:46 build/C/man2/sigaltstack.2:26 build/C/man7/sigevent.7:25 build/C/man3/siginterrupt.3:30 build/C/man2/signal.2:35 build/C/man7/signal.7:45 build/C/man2/signalfd.2:20 build/C/man3/sigpause.3:24 build/C/man2/sigpending.2:28 build/C/man2/sigprocmask.2:28 build/C/man3/sigqueue.3:27 build/C/man2/sigreturn.2:28 build/C/man3/sigset.3:25 build/C/man3/sigsetops.3:30 build/C/man2/sigsuspend.2:28 build/C/man3/sigvec.3:25 build/C/man3/sigwait.3:25 build/C/man2/sigwaitinfo.2:24 build/C/man3/sysv_signal.3:24 build/C/man2/timer_create.2:30 build/C/man2/timer_delete.2:24 build/C/man2/timer_getoverrun.2:24 build/C/man2/timer_settime.2:24 build/C/man2/timerfd_create.2:21 build/C/man2/tkill.2:30 build/C/man2/wait.2:51 build/C/man2/wait4.2:35
44 #: build/C/man3/bsd_signal.3:26
45 msgid "bsd_signal - signal handling with BSD semantics"
49 #: build/C/man3/bsd_signal.3:26 build/C/man2/eventfd.2:24 build/C/man2/getitimer.2:10 build/C/man3/gsignal.3:28 build/C/man2/kill.2:47 build/C/man2/killpg.2:43 build/C/man2/pause.2:33 build/C/man2/prctl.2:51 build/C/man3/profil.3:31 build/C/man3/psignal.3:31 build/C/man3/raise.3:30 build/C/man2/rt_sigqueueinfo.2:26 build/C/man2/sgetmask.2:27 build/C/man2/sigaction.2:48 build/C/man2/sigaltstack.2:28 build/C/man7/sigevent.7:27 build/C/man3/siginterrupt.3:32 build/C/man2/signal.2:37 build/C/man2/signalfd.2:22 build/C/man3/sigpause.3:26 build/C/man2/sigpending.2:30 build/C/man2/sigprocmask.2:30 build/C/man3/sigqueue.3:29 build/C/man2/sigreturn.2:30 build/C/man3/sigset.3:27 build/C/man3/sigsetops.3:33 build/C/man2/sigsuspend.2:30 build/C/man3/sigvec.3:27 build/C/man3/sigwait.3:27 build/C/man2/sigwaitinfo.2:26 build/C/man3/sysv_signal.3:26 build/C/man2/timer_create.2:32 build/C/man2/timer_delete.2:26 build/C/man2/timer_getoverrun.2:26 build/C/man2/timer_settime.2:27 build/C/man2/timerfd_create.2:24 build/C/man2/tkill.2:32 build/C/man2/wait.2:53 build/C/man2/wait4.2:37
55 #: build/C/man3/bsd_signal.3:28
56 msgid "B<#define _XOPEN_SOURCE> /* See feature_test_macros(7) */"
60 #: build/C/man3/bsd_signal.3:30 build/C/man2/killpg.2:45 build/C/man2/sigaltstack.2:30 build/C/man2/signal.2:39 build/C/man2/sigpending.2:32 build/C/man2/sigprocmask.2:32 build/C/man3/sigqueue.3:31 build/C/man3/sigset.3:29 build/C/man3/sigsetops.3:35 build/C/man2/sigsuspend.2:32 build/C/man3/sigvec.3:29 build/C/man3/sysv_signal.3:30
61 msgid "B<#include E<lt>signal.hE<gt>>"
65 #: build/C/man3/bsd_signal.3:32 build/C/man2/signal.2:41 build/C/man3/sigset.3:31 build/C/man3/sysv_signal.3:32
66 msgid "B<typedef void (*sighandler_t)(int);>"
70 #: build/C/man3/bsd_signal.3:34
71 msgid "B<sighandler_t bsd_signal(int >I<signum>B<, sighandler_t >I<handler>B<);>"
75 #: build/C/man3/bsd_signal.3:34 build/C/man2/eventfd.2:28 build/C/man2/getitimer.2:19 build/C/man3/gsignal.3:47 build/C/man2/kill.2:65 build/C/man2/killpg.2:59 build/C/man2/pause.2:37 build/C/man2/prctl.2:58 build/C/man3/profil.3:44 build/C/man3/psignal.3:54 build/C/man3/raise.3:36 build/C/man2/rt_sigqueueinfo.2:33 build/C/man2/sgetmask.2:31 build/C/man2/sigaction.2:65 build/C/man2/sigaltstack.2:49 build/C/man7/sigevent.7:50 build/C/man3/siginterrupt.3:53 build/C/man2/signal.2:43 build/C/man7/signal.7:47 build/C/man2/signalfd.2:26 build/C/man3/sigpause.3:34 build/C/man2/sigpending.2:44 build/C/man2/sigprocmask.2:45 build/C/man3/sigqueue.3:41 build/C/man2/sigreturn.2:32 build/C/man3/sigset.3:56 build/C/man3/sigsetops.3:61 build/C/man2/sigsuspend.2:44 build/C/man3/sigvec.3:47 build/C/man3/sigwait.3:43 build/C/man2/sigwaitinfo.2:44 build/C/man3/sysv_signal.3:34 build/C/man2/timer_create.2:50 build/C/man2/timer_delete.2:42 build/C/man2/timer_getoverrun.2:42 build/C/man2/timer_settime.2:47 build/C/man2/timerfd_create.2:36 build/C/man2/tkill.2:38 build/C/man2/wait.2:82 build/C/man2/wait4.2:68
81 #: build/C/man3/bsd_signal.3:39
83 "The B<bsd_signal>() function takes the same arguments, and performs the "
84 "same task, as B<signal>(2)."
88 #: build/C/man3/bsd_signal.3:52
90 "The difference between the two is that B<bsd_signal>() is guaranteed to "
91 "provide reliable signal semantics, that is: a) the disposition of the signal "
92 "is not reset to the default when the handler is invoked; b) delivery of "
93 "further instances of the signal is blocked while the signal handler is "
94 "executing; and c) if the handler interrupts a blocking system call, then the "
95 "system call is automatically restarted. A portable application cannot rely "
96 "on B<signal>(2) to provide these guarantees."
100 #: build/C/man3/bsd_signal.3:52 build/C/man2/eventfd.2:222 build/C/man2/getitimer.2:117 build/C/man2/kill.2:99 build/C/man2/killpg.2:88 build/C/man2/pause.2:42 build/C/man2/prctl.2:546 build/C/man3/profil.3:66 build/C/man3/psignal.3:87 build/C/man3/raise.3:59 build/C/man2/rt_sigqueueinfo.2:124 build/C/man2/sgetmask.2:54 build/C/man2/sigaction.2:656 build/C/man2/sigaltstack.2:131 build/C/man3/siginterrupt.3:71 build/C/man2/signal.2:95 build/C/man2/signalfd.2:248 build/C/man3/sigpause.3:46 build/C/man2/sigpending.2:51 build/C/man2/sigprocmask.2:91 build/C/man3/sigqueue.3:81 build/C/man2/sigreturn.2:51 build/C/man3/sigset.3:127 build/C/man3/sigsetops.3:105 build/C/man2/sigsuspend.2:68 build/C/man3/sigvec.3:197 build/C/man3/sigwait.3:66 build/C/man2/sigwaitinfo.2:101 build/C/man3/sysv_signal.3:49 build/C/man2/timer_create.2:165 build/C/man2/timer_delete.2:50 build/C/man2/timer_getoverrun.2:79 build/C/man2/timer_settime.2:169 build/C/man2/timerfd_create.2:286 build/C/man2/tkill.2:69 build/C/man2/wait.2:354 build/C/man2/wait4.2:127
106 #: build/C/man3/bsd_signal.3:58
108 "The B<bsd_signal>() function returns the previous value of the signal "
109 "handler, or B<SIG_ERR> on error."
113 #: build/C/man3/bsd_signal.3:58 build/C/man2/eventfd.2:229 build/C/man2/getitimer.2:122 build/C/man2/kill.2:104 build/C/man2/killpg.2:93 build/C/man2/pause.2:53 build/C/man2/prctl.2:563 build/C/man2/rt_sigqueueinfo.2:129 build/C/man2/sgetmask.2:59 build/C/man2/sigaction.2:659 build/C/man2/sigaltstack.2:135 build/C/man3/siginterrupt.3:76 build/C/man2/signal.2:100 build/C/man2/signalfd.2:262 build/C/man2/sigpending.2:54 build/C/man2/sigprocmask.2:94 build/C/man3/sigqueue.3:89 build/C/man3/sigset.3:152 build/C/man3/sigsetops.3:121 build/C/man2/sigsuspend.2:72 build/C/man3/sigvec.3:214 build/C/man3/sigwait.3:71 build/C/man2/sigwaitinfo.2:110 build/C/man3/sysv_signal.3:55 build/C/man2/timer_create.2:173 build/C/man2/timer_delete.2:57 build/C/man2/timer_getoverrun.2:87 build/C/man2/timer_settime.2:178 build/C/man2/timerfd_create.2:301 build/C/man2/tkill.2:73 build/C/man2/wait.2:383 build/C/man2/wait4.2:130
119 #: build/C/man3/bsd_signal.3:61 build/C/man3/sysv_signal.3:58
120 msgid "As for B<signal>(2)."
124 #: build/C/man3/bsd_signal.3:61 build/C/man2/eventfd.2:266 build/C/man2/getitimer.2:143 build/C/man3/gsignal.3:93 build/C/man2/kill.2:120 build/C/man2/killpg.2:110 build/C/man2/pause.2:57 build/C/man2/prctl.2:725 build/C/man3/profil.3:68 build/C/man3/psignal.3:97 build/C/man3/raise.3:62 build/C/man2/rt_sigqueueinfo.2:171 build/C/man2/sgetmask.2:61 build/C/man2/sigaction.2:671 build/C/man2/sigaltstack.2:154 build/C/man7/sigevent.7:128 build/C/man3/siginterrupt.3:80 build/C/man2/signal.2:105 build/C/man7/signal.7:836 build/C/man2/signalfd.2:304 build/C/man3/sigpause.3:54 build/C/man2/sigpending.2:59 build/C/man2/sigprocmask.2:107 build/C/man3/sigqueue.3:112 build/C/man2/sigreturn.2:58 build/C/man3/sigset.3:171 build/C/man3/sigsetops.3:126 build/C/man2/sigsuspend.2:80 build/C/man3/sigvec.3:219 build/C/man3/sigwait.3:77 build/C/man2/sigwaitinfo.2:129 build/C/man3/sysv_signal.3:58 build/C/man2/timer_create.2:191 build/C/man2/timer_delete.2:64 build/C/man2/timer_getoverrun.2:94 build/C/man2/timer_settime.2:203 build/C/man2/timerfd_create.2:370 build/C/man2/tkill.2:90 build/C/man2/wait.2:421 build/C/man2/wait4.2:133
126 msgid "CONFORMING TO"
130 #: build/C/man3/bsd_signal.3:68
132 "4.2BSD, POSIX.1-2001. POSIX.1-2008 removes the specification of "
133 "B<bsd_signal>(), recommending the use of B<sigaction>(2) instead."
137 #: build/C/man3/bsd_signal.3:68 build/C/man2/eventfd.2:271 build/C/man2/getitimer.2:153 build/C/man2/kill.2:122 build/C/man2/killpg.2:114 build/C/man3/raise.3:64 build/C/man2/rt_sigqueueinfo.2:173 build/C/man2/sgetmask.2:63 build/C/man2/sigaction.2:674 build/C/man2/sigaltstack.2:156 build/C/man2/signal.2:107 build/C/man2/signalfd.2:309 build/C/man3/sigpause.3:58 build/C/man2/sigpending.2:61 build/C/man2/sigprocmask.2:109 build/C/man3/sigqueue.3:114 build/C/man2/sigreturn.2:62 build/C/man3/sigset.3:188 build/C/man3/sigsetops.3:128 build/C/man2/sigsuspend.2:82 build/C/man3/sigvec.3:225 build/C/man3/sigwait.3:79 build/C/man2/sigwaitinfo.2:131 build/C/man3/sysv_signal.3:60 build/C/man2/timer_create.2:193 build/C/man2/timer_getoverrun.2:96 build/C/man2/tkill.2:96 build/C/man2/wait.2:423 build/C/man2/wait4.2:135
143 #: build/C/man3/bsd_signal.3:74
144 msgid "Use of B<bsd_signal>() should be avoided; use B<sigaction>(2) instead."
148 #: build/C/man3/bsd_signal.3:85
150 "On modern Linux systems, B<bsd_signal>() and B<signal>(2) are equivalent. "
151 "But on older systems, B<signal>(2) provided unreliable signal semantics; "
152 "see B<signal>(2) for details."
156 #: build/C/man3/bsd_signal.3:92 build/C/man3/sysv_signal.3:85
158 "The use of I<sighandler_t> is a GNU extension; this type is only defined if "
159 "the B<_GNU_SOURCE> feature test macro is defined."
163 #: build/C/man3/bsd_signal.3:92 build/C/man2/eventfd.2:417 build/C/man2/getitimer.2:219 build/C/man3/gsignal.3:101 build/C/man2/kill.2:170 build/C/man2/killpg.2:133 build/C/man2/pause.2:59 build/C/man2/prctl.2:739 build/C/man3/profil.3:79 build/C/man3/psignal.3:111 build/C/man3/raise.3:75 build/C/man2/rt_sigqueueinfo.2:183 build/C/man2/sgetmask.2:74 build/C/man2/sigaction.2:787 build/C/man2/sigaltstack.2:230 build/C/man7/sigevent.7:130 build/C/man3/siginterrupt.3:89 build/C/man2/signal.2:260 build/C/man7/signal.7:848 build/C/man2/signalfd.2:430 build/C/man3/sigpause.3:96 build/C/man2/sigpending.2:82 build/C/man2/sigprocmask.2:139 build/C/man3/sigqueue.3:147 build/C/man2/sigreturn.2:72 build/C/man3/sigset.3:264 build/C/man3/sigsetops.3:166 build/C/man2/sigsuspend.2:104 build/C/man3/sigvec.3:250 build/C/man3/sigwait.3:86 build/C/man2/sigwaitinfo.2:182 build/C/man3/sysv_signal.3:85 build/C/man2/timer_create.2:397 build/C/man2/timer_delete.2:66 build/C/man2/timer_getoverrun.2:128 build/C/man2/timer_settime.2:208 build/C/man2/timerfd_create.2:540 build/C/man2/tkill.2:105 build/C/man2/wait.2:605 build/C/man2/wait4.2:153
169 #: build/C/man3/bsd_signal.3:97
170 msgid "B<sigaction>(2), B<signal>(2), B<sysv_signal>(3), B<signal>(7)"
174 #: build/C/man3/bsd_signal.3:97 build/C/man2/eventfd.2:428 build/C/man2/getitimer.2:226 build/C/man3/gsignal.3:105 build/C/man2/kill.2:180 build/C/man2/killpg.2:139 build/C/man2/pause.2:64 build/C/man2/prctl.2:742 build/C/man3/profil.3:84 build/C/man3/psignal.3:116 build/C/man3/raise.3:82 build/C/man2/rt_sigqueueinfo.2:191 build/C/man2/sgetmask.2:77 build/C/man2/sigaction.2:806 build/C/man2/sigaltstack.2:237 build/C/man7/sigevent.7:140 build/C/man3/siginterrupt.3:91 build/C/man2/signal.2:279 build/C/man7/signal.7:881 build/C/man2/signalfd.2:443 build/C/man3/sigpause.3:104 build/C/man2/sigpending.2:90 build/C/man2/sigprocmask.2:150 build/C/man3/sigqueue.3:155 build/C/man2/sigreturn.2:77 build/C/man3/sigset.3:274 build/C/man3/sigsetops.3:171 build/C/man2/sigsuspend.2:114 build/C/man3/sigvec.3:260 build/C/man3/sigwait.3:94 build/C/man2/sigwaitinfo.2:194 build/C/man3/sysv_signal.3:90 build/C/man2/timer_create.2:410 build/C/man2/timer_delete.2:72 build/C/man2/timer_getoverrun.2:138 build/C/man2/timer_settime.2:212 build/C/man2/timerfd_create.2:552 build/C/man2/tkill.2:110 build/C/man2/wait.2:617 build/C/man2/wait4.2:160
180 #: build/C/man3/bsd_signal.3:104 build/C/man2/eventfd.2:435 build/C/man2/getitimer.2:233 build/C/man3/gsignal.3:112 build/C/man2/kill.2:187 build/C/man2/killpg.2:146 build/C/man2/pause.2:71 build/C/man2/prctl.2:749 build/C/man3/profil.3:91 build/C/man3/psignal.3:123 build/C/man3/raise.3:89 build/C/man2/rt_sigqueueinfo.2:198 build/C/man2/sgetmask.2:84 build/C/man2/sigaction.2:813 build/C/man2/sigaltstack.2:244 build/C/man7/sigevent.7:147 build/C/man3/siginterrupt.3:98 build/C/man2/signal.2:286 build/C/man7/signal.7:888 build/C/man2/signalfd.2:450 build/C/man3/sigpause.3:111 build/C/man2/sigpending.2:97 build/C/man2/sigprocmask.2:157 build/C/man3/sigqueue.3:162 build/C/man2/sigreturn.2:84 build/C/man3/sigset.3:281 build/C/man3/sigsetops.3:178 build/C/man2/sigsuspend.2:121 build/C/man3/sigvec.3:267 build/C/man3/sigwait.3:101 build/C/man2/sigwaitinfo.2:201 build/C/man3/sysv_signal.3:97 build/C/man2/timer_create.2:417 build/C/man2/timer_delete.2:79 build/C/man2/timer_getoverrun.2:145 build/C/man2/timer_settime.2:219 build/C/man2/timerfd_create.2:559 build/C/man2/tkill.2:117 build/C/man2/wait.2:624 build/C/man2/wait4.2:167
182 "This page is part of release 3.41 of the Linux I<man-pages> project. A "
183 "description of the project, and information about reporting bugs, can be "
184 "found at http://www.kernel.org/doc/man-pages/."
188 #: build/C/man2/eventfd.2:21
194 #: build/C/man2/eventfd.2:21
200 #: build/C/man2/eventfd.2:21 build/C/man2/getitimer.2:7 build/C/man2/kill.2:44 build/C/man2/killpg.2:40 build/C/man2/pause.2:30 build/C/man2/prctl.2:48 build/C/man3/profil.3:28 build/C/man2/rt_sigqueueinfo.2:23 build/C/man2/sgetmask.2:24 build/C/man2/sigaction.2:45 build/C/man2/sigaltstack.2:25 build/C/man2/signal.2:34 build/C/man7/signal.7:44 build/C/man2/signalfd.2:19 build/C/man3/sigpause.3:23 build/C/man2/sigpending.2:27 build/C/man2/sigprocmask.2:27 build/C/man3/sigqueue.3:26 build/C/man2/sigreturn.2:27 build/C/man3/sigset.3:24 build/C/man3/sigsetops.3:29 build/C/man2/sigsuspend.2:27 build/C/man3/sigvec.3:24 build/C/man3/sigwait.3:24 build/C/man2/sigwaitinfo.2:23 build/C/man2/timer_create.2:29 build/C/man2/timer_delete.2:23 build/C/man2/timer_getoverrun.2:23 build/C/man2/timer_settime.2:23 build/C/man2/timerfd_create.2:20 build/C/man2/tkill.2:29 build/C/man2/wait.2:50 build/C/man2/wait4.2:34
206 #: build/C/man2/eventfd.2:24
207 msgid "eventfd - create a file descriptor for event notification"
211 #: build/C/man2/eventfd.2:26
212 msgid "B<#include E<lt>sys/eventfd.hE<gt>>"
216 #: build/C/man2/eventfd.2:28
217 msgid "B<int eventfd(unsigned int >I<initval>B<, int >I<flags>B<);>"
221 #: build/C/man2/eventfd.2:38
223 "B<eventfd>() creates an \"eventfd object\" that can be used as an event "
224 "wait/notify mechanism by userspace applications, and by the kernel to notify "
225 "userspace applications of events. The object contains an unsigned 64-bit "
226 "integer (I<uint64_t>) counter that is maintained by the kernel. This "
227 "counter is initialized with the value specified in the argument I<initval>."
231 #: build/C/man2/eventfd.2:43
233 "The following values may be bitwise ORed in I<flags> to change the behaviour "
238 #: build/C/man2/eventfd.2:43
240 msgid "B<EFD_CLOEXEC> (since Linux 2.6.27)"
244 #: build/C/man2/eventfd.2:53 build/C/man2/signalfd.2:94 build/C/man2/timerfd_create.2:102
246 "Set the close-on-exec (B<FD_CLOEXEC>) flag on the new file descriptor. See "
247 "the description of the B<O_CLOEXEC> flag in B<open>(2) for reasons why this "
252 #: build/C/man2/eventfd.2:53
254 msgid "B<EFD_NONBLOCK> (since Linux 2.6.27)"
258 #: build/C/man2/eventfd.2:61 build/C/man2/signalfd.2:84 build/C/man2/timerfd_create.2:92
260 "Set the B<O_NONBLOCK> file status flag on the new open file description. "
261 "Using this flag saves extra calls to B<fcntl>(2) to achieve the same "
266 #: build/C/man2/eventfd.2:61
268 msgid "B<EFD_SEMAPHORE> (since Linux 2.6.30)"
272 #: build/C/man2/eventfd.2:65
274 "Provide semaphore-like semantics for reads from the new file descriptor. "
279 #: build/C/man2/eventfd.2:69 build/C/man2/signalfd.2:98
281 "In Linux up to version 2.6.26, the I<flags> argument is unused, and must be "
286 #: build/C/man2/eventfd.2:75
288 "As its return value, B<eventfd>() returns a new file descriptor that can be "
289 "used to refer to the eventfd object. The following operations can be "
290 "performed on the file descriptor:"
294 #: build/C/man2/eventfd.2:75 build/C/man2/signalfd.2:101 build/C/man2/timerfd_create.2:210
300 #: build/C/man2/eventfd.2:85
302 "Each successful B<read>(2) returns an 8-byte integer. A B<read>(2) will "
303 "fail with the error B<EINVAL> if the size of the supplied buffer is less "
308 #: build/C/man2/eventfd.2:90
310 "The value returned by B<read>(2) is in host byte order, i.e., the native "
311 "byte order for integers on the host machine."
315 #: build/C/man2/eventfd.2:97
317 "The semantics of B<read>(2) depend on whether the eventfd counter currently "
318 "has a nonzero value and whether the B<EFD_SEMAPHORE> flag was specified when "
319 "creating the eventfd file descriptor:"
323 #: build/C/man2/eventfd.2:98 build/C/man2/eventfd.2:105 build/C/man2/eventfd.2:112 build/C/man2/eventfd.2:157 build/C/man2/eventfd.2:167 build/C/man2/eventfd.2:177 build/C/man2/prctl.2:606 build/C/man2/prctl.2:611 build/C/man2/prctl.2:616 build/C/man2/prctl.2:626 build/C/man3/psignal.3:103 build/C/man3/psignal.3:107 build/C/man2/sigaction.2:294 build/C/man2/sigaction.2:309 build/C/man2/sigaction.2:325 build/C/man2/sigaction.2:340 build/C/man2/sigaction.2:387 build/C/man2/sigaction.2:423 build/C/man2/signal.2:66 build/C/man2/signal.2:71 build/C/man2/signal.2:78 build/C/man2/signal.2:206 build/C/man2/signal.2:210 build/C/man2/signal.2:249 build/C/man7/signal.7:147 build/C/man7/signal.7:155 build/C/man7/signal.7:613 build/C/man7/signal.7:615 build/C/man7/signal.7:636 build/C/man7/signal.7:651 build/C/man7/signal.7:655 build/C/man7/signal.7:662 build/C/man7/signal.7:678 build/C/man7/signal.7:684 build/C/man7/signal.7:691 build/C/man7/signal.7:696 build/C/man7/signal.7:715 build/C/man7/signal.7:734 build/C/man7/signal.7:741 build/C/man7/signal.7:750 build/C/man7/signal.7:758 build/C/man7/signal.7:764 build/C/man7/signal.7:769 build/C/man7/signal.7:789 build/C/man7/signal.7:808 build/C/man7/signal.7:811 build/C/man7/signal.7:814 build/C/man7/signal.7:817 build/C/man7/signal.7:822 build/C/man7/signal.7:828 build/C/man7/signal.7:832 build/C/man3/sigwait.3:59 build/C/man3/sigwait.3:64 build/C/man2/timer_create.2:214 build/C/man2/timer_create.2:217 build/C/man2/timer_create.2:220 build/C/man2/timer_create.2:224 build/C/man2/timer_create.2:227 build/C/man2/timer_create.2:233 build/C/man2/timer_create.2:237
329 #: build/C/man2/eventfd.2:105
331 "If B<EFD_SEMAPHORE> was not specified and the eventfd counter has a nonzero "
332 "value, then a B<read>(2) returns 8 bytes containing that value, and the "
333 "counter's value is reset to zero."
337 #: build/C/man2/eventfd.2:112
339 "If B<EFD_SEMAPHORE> was specified and the eventfd counter has a nonzero "
340 "value, then a B<read>(2) returns 8 bytes containing the value 1, and the "
341 "counter's value is decremented by 1."
345 #: build/C/man2/eventfd.2:122
347 "If the eventfd counter is zero at the time of the call to B<read>(2), then "
348 "the call either blocks until the counter becomes nonzero (at which time, the "
349 "B<read>(2) proceeds as described above) or fails with the error B<EAGAIN> "
350 "if the file descriptor has been made nonblocking."
354 #: build/C/man2/eventfd.2:123
360 #: build/C/man2/eventfd.2:140
362 "A B<write>(2) call adds the 8-byte integer value supplied in its buffer to "
363 "the counter. The maximum value that may be stored in the counter is the "
364 "largest unsigned 64-bit value minus 1 (i.e., 0xfffffffffffffffe). If the "
365 "addition would cause the counter's value to exceed the maximum, then the "
366 "B<write>(2) either blocks until a B<read>(2) is performed on the file "
367 "descriptor, or fails with the error B<EAGAIN> if the file descriptor has "
368 "been made nonblocking."
372 #: build/C/man2/eventfd.2:147
374 "A B<write>(2) will fail with the error B<EINVAL> if the size of the "
375 "supplied buffer is less than 8 bytes, or if an attempt is made to write the "
376 "value 0xffffffffffffffff."
380 #: build/C/man2/eventfd.2:147 build/C/man2/signalfd.2:139 build/C/man2/timerfd_create.2:243
382 msgid "B<poll>(2), B<select>(2) (and similar)"
386 #: build/C/man2/eventfd.2:156
388 "The returned file descriptor supports B<poll>(2) (and analogously "
389 "B<epoll>(7)) and B<select>(2), as follows:"
393 #: build/C/man2/eventfd.2:167
395 "The file descriptor is readable (the B<select>(2) I<readfds> argument; the "
396 "B<poll>(2) B<POLLIN> flag) if the counter has a value greater than 0."
400 #: build/C/man2/eventfd.2:177
402 "The file descriptor is writable (the B<select>(2) I<writefds> argument; the "
403 "B<poll>(2) B<POLLOUT> flag) if it is possible to write a value of at least "
404 "\"1\" without blocking."
408 #: build/C/man2/eventfd.2:197
410 "If an overflow of the counter value was detected, then B<select>(2) "
411 "indicates the file descriptor as being both readable and writable, and "
412 "B<poll>(2) returns a B<POLLERR> event. As noted above, B<write>(2) can "
413 "never overflow the counter. However an overflow can occur if 2^64 eventfd "
414 "\"signal posts\" were performed by the KAIO subsystem (theoretically "
415 "possible, but practically unlikely). If an overflow has occurred, then "
416 "B<read>(2) will return that maximum I<uint64_t> value (i.e., "
417 "0xffffffffffffffff)."
421 #: build/C/man2/eventfd.2:205
423 "The eventfd file descriptor also supports the other file-descriptor "
424 "multiplexing APIs: B<pselect>(2), B<ppoll>(2), and B<epoll>(7)."
428 #: build/C/man2/eventfd.2:205 build/C/man2/signalfd.2:159 build/C/man2/timerfd_create.2:261
434 #: build/C/man2/eventfd.2:210
436 "When the file descriptor is no longer required it should be closed. When "
437 "all file descriptors associated with the same eventfd object have been "
438 "closed, the resources for object are freed by the kernel."
442 #: build/C/man2/eventfd.2:222
444 "A copy of the file descriptor created by B<eventfd>() is inherited by the "
445 "child produced by B<fork>(2). The duplicate file descriptor is associated "
446 "with the same eventfd object. File descriptors created by B<eventfd>() are "
447 "preserved across B<execve>(2), unless the close-on-exec flag has been set."
451 #: build/C/man2/eventfd.2:229
453 "On success, B<eventfd>() returns a new eventfd file descriptor. On error, "
454 "-1 is returned and I<errno> is set to indicate the error."
458 #: build/C/man2/eventfd.2:230 build/C/man2/getitimer.2:130 build/C/man2/kill.2:105 build/C/man2/killpg.2:94 build/C/man2/prctl.2:568 build/C/man2/prctl.2:573 build/C/man2/prctl.2:585 build/C/man2/prctl.2:590 build/C/man2/prctl.2:599 build/C/man2/rt_sigqueueinfo.2:136 build/C/man2/sigaction.2:664 build/C/man2/sigaltstack.2:140 build/C/man3/siginterrupt.3:77 build/C/man2/signal.2:101 build/C/man2/signalfd.2:268 build/C/man2/signalfd.2:276 build/C/man2/sigprocmask.2:102 build/C/man3/sigqueue.3:96 build/C/man3/sigsetops.3:122 build/C/man3/sigwait.3:72 build/C/man2/sigwaitinfo.2:125 build/C/man2/timer_create.2:177 build/C/man2/timer_delete.2:58 build/C/man2/timer_getoverrun.2:88 build/C/man2/timer_settime.2:187 build/C/man2/timer_settime.2:195 build/C/man2/timerfd_create.2:304 build/C/man2/timerfd_create.2:312 build/C/man2/timerfd_create.2:348 build/C/man2/timerfd_create.2:355 build/C/man2/timerfd_create.2:361 build/C/man2/tkill.2:74 build/C/man2/wait.2:416
464 #: build/C/man2/eventfd.2:234
465 msgid "An unsupported value was specified in I<flags>."
469 #: build/C/man2/eventfd.2:234 build/C/man2/signalfd.2:283 build/C/man2/timerfd_create.2:319
475 #: build/C/man2/eventfd.2:237
476 msgid "The per-process limit on open file descriptors has been reached."
480 #: build/C/man2/eventfd.2:237 build/C/man2/signalfd.2:286 build/C/man2/timerfd_create.2:322
486 #: build/C/man2/eventfd.2:241 build/C/man2/signalfd.2:290 build/C/man2/timerfd_create.2:326
487 msgid "The system-wide limit on the total number of open files has been reached."
491 #: build/C/man2/eventfd.2:241 build/C/man2/signalfd.2:290 build/C/man2/timerfd_create.2:326
497 #: build/C/man2/eventfd.2:249 build/C/man2/signalfd.2:293 build/C/man2/timerfd_create.2:329
498 msgid "Could not mount (internal) anonymous inode device."
502 #: build/C/man2/eventfd.2:249 build/C/man2/sigaltstack.2:145 build/C/man2/signalfd.2:293 build/C/man2/timer_create.2:185 build/C/man2/timerfd_create.2:329
508 #: build/C/man2/eventfd.2:253
509 msgid "There was insufficient memory to create a new eventfd file descriptor."
513 #: build/C/man2/eventfd.2:253 build/C/man2/prctl.2:720 build/C/man3/psignal.3:93 build/C/man2/rt_sigqueueinfo.2:164 build/C/man2/signalfd.2:296 build/C/man3/sigqueue.3:110 build/C/man2/timer_create.2:189 build/C/man2/timer_delete.2:62 build/C/man2/timer_getoverrun.2:92 build/C/man2/timer_settime.2:201 build/C/man2/timerfd_create.2:367 build/C/man2/tkill.2:85
518 #. eventfd() is in glibc 2.7, but reportedly does not build
520 #: build/C/man2/eventfd.2:266
522 "B<eventfd>() is available on Linux since kernel 2.6.22. Working support is "
523 "provided in glibc since version 2.8. The B<eventfd2>() system call (see "
524 "NOTES) is available on Linux since kernel 2.6.27. Since version 2.9, the "
525 "glibc B<eventfd>() wrapper will employ the B<eventfd2>() system call, if "
526 "it is supported by the kernel."
530 #: build/C/man2/eventfd.2:271
531 msgid "B<eventfd>() and B<eventfd2>() are Linux-specific."
535 #: build/C/man2/eventfd.2:279
537 "Applications can use an eventfd file descriptor instead of a pipe (see "
538 "B<pipe>(2)) in all cases where a pipe is used simply to signal events. The "
539 "kernel overhead of an eventfd file descriptor is much lower than that of a "
540 "pipe, and only one file descriptor is required (versus the two required for "
544 #. or eventually syslets/threadlets
546 #: build/C/man2/eventfd.2:285
548 "When used in the kernel, an eventfd file descriptor can provide a "
549 "kernel-userspace bridge allowing, for example, functionalities like KAIO "
550 "(kernel AIO) to signal to a file descriptor that some operation is "
555 #: build/C/man2/eventfd.2:302
557 "A key point about an eventfd file descriptor is that it can be monitored "
558 "just like any other file descriptor using B<select>(2), B<poll>(2), or "
559 "B<epoll>(7). This means that an application can simultaneously monitor the "
560 "readiness of \"traditional\" files and the readiness of other kernel "
561 "mechanisms that support the eventfd interface. (Without the B<eventfd>() "
562 "interface, these mechanisms could not be multiplexed via B<select>(2), "
563 "B<poll>(2), or B<epoll>(7).)"
567 #: build/C/man2/eventfd.2:302 build/C/man2/signalfd.2:333
569 msgid "Underlying Linux system calls"
573 #: build/C/man2/eventfd.2:316
575 "There are two underlying Linux system calls: B<eventfd>() and the more "
576 "recent B<eventfd2>(). The former system call does not implement a I<flags> "
577 "argument. The latter system call implements the I<flags> values described "
578 "above. The glibc wrapper function will use B<eventfd2>() where it is "
583 #: build/C/man2/eventfd.2:316
585 msgid "Additional glibc features"
589 #: build/C/man2/eventfd.2:320
591 "The GNU C library defines an additional type, and two functions that attempt "
592 "to abstract some of the details of reading and writing on an eventfd file "
597 #: build/C/man2/eventfd.2:324
599 msgid "typedef uint64_t eventfd_t;\n"
603 #: build/C/man2/eventfd.2:327
606 "int eventfd_read(int fd, eventfd_t *value);\n"
607 "int eventfd_write(int fd, eventfd_t value);\n"
611 #: build/C/man2/eventfd.2:334
613 "The functions perform the read and write operations on an eventfd file "
614 "descriptor, returning 0 if the correct number of bytes was transferred, or "
619 #: build/C/man2/eventfd.2:334 build/C/man2/sigaction.2:784 build/C/man2/sigaltstack.2:213 build/C/man2/signalfd.2:357 build/C/man3/sigwait.3:83 build/C/man2/timer_create.2:251 build/C/man2/timer_getoverrun.2:125 build/C/man2/timer_settime.2:205 build/C/man2/timerfd_create.2:372 build/C/man2/wait.2:522
625 #: build/C/man2/eventfd.2:343
627 "The following program creates an eventfd file descriptor and then forks to "
628 "create a child process. While the parent briefly sleeps, the child writes "
629 "each of the integers supplied in the program's command-line arguments to the "
630 "eventfd file descriptor. When the parent has finished sleeping, it reads "
631 "from the eventfd file descriptor."
635 #: build/C/man2/eventfd.2:345
636 msgid "The following shell session shows a sample run of the program:"
640 #: build/C/man2/eventfd.2:357
643 "$B< ./a.out 1 2 4 7 14>\n"
644 "Child writing 1 to efd\n"
645 "Child writing 2 to efd\n"
646 "Child writing 4 to efd\n"
647 "Child writing 7 to efd\n"
648 "Child writing 14 to efd\n"
649 "Child completed write loop\n"
650 "Parent about to read\n"
651 "Parent read 28 (0x1c) from efd\n"
655 #: build/C/man2/eventfd.2:359 build/C/man2/signalfd.2:380 build/C/man2/timerfd_create.2:400 build/C/man2/wait.2:557
657 msgid "Program source"
661 #: build/C/man2/eventfd.2:367
664 "#include E<lt>sys/eventfd.hE<gt>\n"
665 "#include E<lt>unistd.hE<gt>\n"
666 "#include E<lt>stdlib.hE<gt>\n"
667 "#include E<lt>stdio.hE<gt>\n"
668 "#include E<lt>stdint.hE<gt> /* Definition of uint64_t */\n"
672 #: build/C/man2/eventfd.2:370 build/C/man2/signalfd.2:391
675 "#define handle_error(msg) \\e\n"
676 " do { perror(msg); exit(EXIT_FAILURE); } while (0)\n"
680 #: build/C/man2/eventfd.2:377
684 "main(int argc, char *argv[])\n"
692 #: build/C/man2/eventfd.2:382
695 " if (argc E<lt> 2) {\n"
696 " fprintf(stderr, \"Usage: %s E<lt>numE<gt>...\\en\", argv[0]);\n"
697 " exit(EXIT_FAILURE);\n"
702 #: build/C/man2/eventfd.2:386
705 " efd = eventfd(0, 0);\n"
707 " handle_error(\"eventfd\");\n"
711 #: build/C/man2/eventfd.2:398
714 " switch (fork()) {\n"
716 " for (j = 1; j E<lt> argc; j++) {\n"
717 " printf(\"Child writing %s to efd\\en\", argv[j]);\n"
718 " u = strtoull(argv[j], NULL, 0);\n"
719 " /* strtoull() allows various bases */\n"
720 " s = write(efd, &u, sizeof(uint64_t));\n"
721 " if (s != sizeof(uint64_t))\n"
722 " handle_error(\"write\");\n"
724 " printf(\"Child completed write loop\\en\");\n"
728 #: build/C/man2/eventfd.2:400
730 msgid " exit(EXIT_SUCCESS);\n"
734 #: build/C/man2/eventfd.2:403
742 #: build/C/man2/eventfd.2:411
745 " printf(\"Parent about to read\\en\");\n"
746 " s = read(efd, &u, sizeof(uint64_t));\n"
747 " if (s != sizeof(uint64_t))\n"
748 " handle_error(\"read\");\n"
749 " printf(\"Parent read %llu (0x%llx) from efd\\en\",\n"
750 " (unsigned long long) u, (unsigned long long) u);\n"
751 " exit(EXIT_SUCCESS);\n"
755 #: build/C/man2/eventfd.2:416
759 " handle_error(\"fork\");\n"
765 #: build/C/man2/eventfd.2:428
767 "B<futex>(2), B<pipe>(2), B<poll>(2), B<read>(2), B<select>(2), "
768 "B<signalfd>(2), B<timerfd_create>(2), B<write>(2), B<epoll>(7), "
773 #: build/C/man2/getitimer.2:7
779 #: build/C/man2/getitimer.2:10
780 msgid "getitimer, setitimer - get or set value of an interval timer"
784 #: build/C/man2/getitimer.2:13
786 msgid "B<#include E<lt>sys/time.hE<gt>>\n"
790 #: build/C/man2/getitimer.2:15
792 msgid "B<int getitimer(int >I<which>B<, struct itimerval *>I<curr_value>B<);>\n"
796 #: build/C/man2/getitimer.2:18
799 "B<int setitimer(int >I<which>B<, const struct itimerval *>I<new_value>B<,>\n"
800 "B< struct itimerval *>I<old_value>B<);>\n"
804 #: build/C/man2/getitimer.2:24
806 "The system provides each process with three interval timers, each "
807 "decrementing in a distinct time domain. When any timer expires, a signal is "
808 "sent to the process, and the timer (potentially) restarts."
812 #: build/C/man2/getitimer.2:24
814 msgid "B<ITIMER_REAL>"
818 #: build/C/man2/getitimer.2:29
819 msgid "decrements in real time, and delivers B<SIGALRM> upon expiration."
823 #: build/C/man2/getitimer.2:29
825 msgid "B<ITIMER_VIRTUAL>"
829 #: build/C/man2/getitimer.2:34
831 "decrements only when the process is executing, and delivers B<SIGVTALRM> "
836 #: build/C/man2/getitimer.2:34
838 msgid "B<ITIMER_PROF>"
842 #: build/C/man2/getitimer.2:44
844 "decrements both when the process executes and when the system is executing "
845 "on behalf of the process. Coupled with B<ITIMER_VIRTUAL>, this timer is "
846 "usually used to profile the time spent by the application in user and kernel "
847 "space. B<SIGPROF> is delivered upon expiration."
851 #: build/C/man2/getitimer.2:46
852 msgid "Timer values are defined by the following structures:"
856 #: build/C/man2/getitimer.2:54
859 "struct itimerval {\n"
860 " struct timeval it_interval; /* next value */\n"
861 " struct timeval it_value; /* current value */\n"
866 #: build/C/man2/getitimer.2:59
870 " long tv_sec; /* seconds */\n"
871 " long tv_usec; /* microseconds */\n"
876 #: build/C/man2/getitimer.2:81
878 "The function B<getitimer>() fills the structure pointed to by I<curr_value> "
879 "with the current setting for the timer specified by I<which> (one of "
880 "B<ITIMER_REAL>, B<ITIMER_VIRTUAL>, or B<ITIMER_PROF>). The element "
881 "I<it_value> is set to the amount of time remaining on the timer, or zero if "
882 "the timer is disabled. Similarly, I<it_interval> is set to the reset value."
886 #: build/C/man2/getitimer.2:89
888 "The function B<setitimer>() sets the specified timer to the value in "
889 "I<new_value>. If I<old_value> is non-NULL, the old value of the timer is "
894 #: build/C/man2/getitimer.2:99
896 "Timers decrement from I<it_value> to zero, generate a signal, and reset to "
897 "I<it_interval>. A timer which is set to zero (I<it_value> is zero or the "
898 "timer expires and I<it_interval> is zero) stops."
902 #: build/C/man2/getitimer.2:105
904 "Both I<tv_sec> and I<tv_usec> are significant in determining the duration of "
909 #: build/C/man2/getitimer.2:117
911 "Timers will never expire before the requested time, but may expire some "
912 "(short) time afterward, which depends on the system timer resolution and on "
913 "the system load; see B<time>(7). (But see BUGS below.) Upon expiration, a "
914 "signal will be generated and the timer reset. If the timer expires while "
915 "the process is active (always true for B<ITIMER_VIRTUAL>) the signal will "
916 "be delivered immediately when generated. Otherwise the delivery will be "
917 "offset by a small time dependent on the system loading."
921 #: build/C/man2/getitimer.2:122 build/C/man2/killpg.2:93 build/C/man2/tkill.2:73
923 "On success, zero is returned. On error, -1 is returned, and I<errno> is set "
928 #: build/C/man2/getitimer.2:123 build/C/man2/prctl.2:564 build/C/man2/sigaction.2:660 build/C/man2/sigaltstack.2:136 build/C/man2/sigpending.2:55 build/C/man2/sigprocmask.2:95 build/C/man2/sigsuspend.2:73 build/C/man2/timer_settime.2:180 build/C/man2/timerfd_create.2:341
934 #: build/C/man2/getitimer.2:130 build/C/man2/timerfd_create.2:348
935 msgid "I<new_value>, I<old_value>, or I<curr_value> is not valid a pointer."
939 #: build/C/man2/getitimer.2:143
941 "I<which> is not one of B<ITIMER_REAL>, B<ITIMER_VIRTUAL>, or B<ITIMER_PROF>; "
942 "or (since Linux 2.6.22) one of the I<tv_usec> fields in the structure "
943 "pointed to by I<new_value> contains a value outside the range 0 to 999999."
947 #: build/C/man2/getitimer.2:153
949 "POSIX.1-2001, SVr4, 4.4BSD (this call first appeared in 4.2BSD). "
950 "POSIX.1-2008 marks B<getitimer>() and B<setitimer>() obsolete, "
951 "recommending the use of the POSIX timers API (B<timer_gettime>(2), "
952 "B<timer_settime>(2), etc.) instead."
956 #: build/C/man2/getitimer.2:159
958 "A child created via B<fork>(2) does not inherit its parent's interval "
959 "timers. Interval timers are preserved across an B<execve>(2)."
963 #: build/C/man2/getitimer.2:169
965 "POSIX.1 leaves the interaction between B<setitimer>() and the three "
966 "interfaces B<alarm>(2), B<sleep>(3), and B<usleep>(3) unspecified."
970 #: build/C/man2/getitimer.2:169 build/C/man2/kill.2:160 build/C/man3/profil.3:70 build/C/man3/psignal.3:99 build/C/man2/sigaction.2:775 build/C/man2/signalfd.2:349 build/C/man2/sigpending.2:76 build/C/man3/sigset.3:230 build/C/man2/timer_getoverrun.2:112 build/C/man2/timerfd_create.2:534
976 #: build/C/man2/getitimer.2:178
978 "The generation and delivery of a signal are distinct, and only one instance "
979 "of each of the signals listed above may be pending for a process. Under "
980 "very heavy loading, an B<ITIMER_REAL> timer may expire before the signal "
981 "from a previous expiration has been delivered. The second signal in such an "
982 "event will be lost."
986 #: build/C/man2/getitimer.2:193
988 "On Linux kernels before 2.6.16, timer values are represented in jiffies. If "
989 "a request is made set a timer with a value whose jiffies representation "
990 "exceeds B<MAX_SEC_IN_JIFFIES> (defined in I<include/linux/jiffies.h>), then "
991 "the timer is silently truncated to this ceiling value. On Linux/i386 "
992 "(where, since Linux 2.6.13, the default jiffy is 0.004 seconds), this means "
993 "that the ceiling value for a timer is approximately 99.42 days. Since Linux "
994 "2.6.16, the kernel uses a different internal representation for times, and "
995 "this ceiling is removed."
998 #. 4 Jul 2005: It looks like this bug may remain in 2.4.x.
999 #. http://lkml.org/lkml/2005/7/1/165
1001 #: build/C/man2/getitimer.2:200
1003 "On certain systems (including i386), Linux kernels before version 2.6.12 "
1004 "have a bug which will produce premature timer expirations of up to one jiffy "
1005 "under some circumstances. This bug is fixed in kernel 2.6.12."
1008 #. Bugzilla report 25 Apr 2006:
1009 #. http://bugzilla.kernel.org/show_bug.cgi?id=6443
1010 #. "setitimer() should reject noncanonical arguments"
1012 #: build/C/man2/getitimer.2:219
1014 "POSIX.1-2001 says that B<setitimer>() should fail if a I<tv_usec> value is "
1015 "specified that is outside of the range 0 to 999999. However, in kernels up "
1016 "to and including 2.6.21, Linux does not give an error, but instead silently "
1017 "adjusts the corresponding seconds value for the timer. From kernel 2.6.22 "
1018 "onward, this nonconformance has been repaired: an improper I<tv_usec> value "
1019 "results in an B<EINVAL> error."
1023 #: build/C/man2/getitimer.2:226
1025 "B<gettimeofday>(2), B<sigaction>(2), B<signal>(2), B<timer_create>(2), "
1026 "B<timerfd_create>(2), B<time>(7)"
1030 #: build/C/man3/gsignal.3:25
1036 #: build/C/man3/gsignal.3:25 build/C/man3/profil.3:28 build/C/man3/sigvec.3:24
1042 #: build/C/man3/gsignal.3:28
1043 msgid "gsignal, ssignal - software signal facility"
1047 #: build/C/man3/gsignal.3:31 build/C/man2/kill.2:52 build/C/man3/psignal.3:34 build/C/man3/raise.3:33 build/C/man2/sigaction.2:51 build/C/man3/siginterrupt.3:35 build/C/man3/sigpause.3:29 build/C/man3/sigwait.3:30 build/C/man2/sigwaitinfo.2:29
1049 msgid "B<#include E<lt>signal.hE<gt>>\n"
1053 #: build/C/man3/gsignal.3:33
1055 msgid "B<typedef void (*sighandler_t)(int);>\n"
1059 #: build/C/man3/gsignal.3:35
1061 msgid "B<int gsignal(int >I<signum>B<);>\n"
1065 #: build/C/man3/gsignal.3:37
1067 msgid "B<sighandler_t ssignal(int >I<signum>B<, sighandler_t >I<action>B<);>\n"
1071 #: build/C/man3/gsignal.3:42 build/C/man2/kill.2:59 build/C/man2/killpg.2:51 build/C/man3/profil.3:40 build/C/man3/psignal.3:44 build/C/man2/sigaction.2:59 build/C/man2/sigaltstack.2:36 build/C/man3/siginterrupt.3:42 build/C/man2/sigpending.2:38 build/C/man2/sigprocmask.2:39 build/C/man3/sigqueue.3:37 build/C/man3/sigset.3:43 build/C/man3/sigsetops.3:49 build/C/man2/sigsuspend.2:38 build/C/man3/sigvec.3:43 build/C/man3/sigwait.3:37 build/C/man2/sigwaitinfo.2:39 build/C/man2/timer_create.2:46 build/C/man2/timer_delete.2:38 build/C/man2/timer_getoverrun.2:38 build/C/man2/timer_settime.2:42 build/C/man2/wait.2:68 build/C/man2/wait4.2:54
1072 msgid "Feature Test Macro Requirements for glibc (see B<feature_test_macros>(7)):"
1076 #: build/C/man3/gsignal.3:47
1077 msgid "B<gsignal>(), B<ssignal>(): _SVID_SOURCE"
1081 #: build/C/man3/gsignal.3:55
1083 "Don't use these functions under Linux. Due to a historical mistake, under "
1084 "Linux these functions are aliases for B<raise>(3) and B<signal>(2), "
1089 #: build/C/man3/gsignal.3:93
1091 "Elsewhere, on System V-like systems, these functions implement software "
1092 "signaling, entirely independent of the classical B<signal>(2) and "
1093 "B<kill>(2) functions. The function B<ssignal>() defines the action to "
1094 "take when the software signal with number I<signum> is raised using the "
1095 "function B<gsignal>(), and returns the previous such action or B<SIG_DFL>. "
1096 "The function B<gsignal>() does the following: if no action (or the action "
1097 "B<SIG_DFL>) was specified for I<signum>, then it does nothing and returns "
1098 "0. If the action B<SIG_IGN> was specified for I<signum>, then it does "
1099 "nothing and returns 1. Otherwise, it resets the action to B<SIG_DFL> and "
1100 "calls the action function with argument I<signum>, and returns the value "
1101 "returned by that function. The range of possible values I<signum> varies "
1102 "(often 1-15 or 1-17)."
1106 #: build/C/man3/gsignal.3:101
1108 "These functions are available under AIX, DG/UX, HP-UX, SCO, Solaris, Tru64. "
1109 "They are called obsolete under most of these systems, and are broken under "
1110 "Linux libc and glibc. Some systems also have B<gsignal_r>() and "
1115 #: build/C/man3/gsignal.3:105
1116 msgid "B<kill>(2), B<signal>(2), B<raise>(3)"
1120 #: build/C/man2/kill.2:44
1126 #: build/C/man2/kill.2:44
1132 #: build/C/man2/kill.2:47
1133 msgid "kill - send signal to a process"
1137 #: build/C/man2/kill.2:50
1139 msgid "B<#include E<lt>sys/types.hE<gt>>\n"
1143 #: build/C/man2/kill.2:54
1145 msgid "B<int kill(pid_t >I<pid>B<, int >I<sig>B<);>\n"
1149 #: build/C/man2/kill.2:64
1150 msgid "B<kill>(): _POSIX_C_SOURCE\\ E<gt>=\\ 1 || _XOPEN_SOURCE || _POSIX_SOURCE"
1154 #: build/C/man2/kill.2:70
1156 "The B<kill>() system call can be used to send any signal to any process "
1161 #: build/C/man2/kill.2:73
1163 "If I<pid> is positive, then signal I<sig> is sent to the process with the ID "
1164 "specified by I<pid>."
1168 #: build/C/man2/kill.2:76
1170 "If I<pid> equals 0, then I<sig> is sent to every process in the process "
1171 "group of the calling process."
1175 #: build/C/man2/kill.2:80
1177 "If I<pid> equals -1, then I<sig> is sent to every process for which the "
1178 "calling process has permission to send signals, except for process 1 "
1179 "(I<init>), but see below."
1183 #: build/C/man2/kill.2:83
1185 "If I<pid> is less than -1, then I<sig> is sent to every process in the "
1186 "process group whose ID is I<-pid>."
1190 #: build/C/man2/kill.2:88
1192 "If I<sig> is 0, then no signal is sent, but error checking is still "
1193 "performed; this can be used to check for the existence of a process ID or "
1198 #: build/C/man2/kill.2:99 build/C/man2/killpg.2:88
1200 "For a process to have permission to send a signal it must either be "
1201 "privileged (under Linux: have the B<CAP_KILL> capability), or the real or "
1202 "effective user ID of the sending process must equal the real or saved "
1203 "set-user-ID of the target process. In the case of B<SIGCONT> it suffices "
1204 "when the sending and receiving processes belong to the same session."
1208 #: build/C/man2/kill.2:104
1210 "On success (at least one signal was sent), zero is returned. On error, -1 "
1211 "is returned, and I<errno> is set appropriately."
1215 #: build/C/man2/kill.2:108
1216 msgid "An invalid signal was specified."
1220 #: build/C/man2/kill.2:108 build/C/man2/killpg.2:98 build/C/man2/prctl.2:639 build/C/man2/prctl.2:651 build/C/man2/prctl.2:661 build/C/man2/prctl.2:669 build/C/man2/rt_sigqueueinfo.2:143 build/C/man2/sigaltstack.2:149 build/C/man3/sigqueue.3:100 build/C/man2/tkill.2:77
1226 #: build/C/man2/kill.2:112 build/C/man2/killpg.2:102
1228 "The process does not have permission to send the signal to any of the target "
1233 #: build/C/man2/kill.2:112 build/C/man2/killpg.2:102 build/C/man2/killpg.2:106 build/C/man2/rt_sigqueueinfo.2:151 build/C/man3/sigqueue.3:106 build/C/man2/tkill.2:82
1239 #: build/C/man2/kill.2:120
1241 "The pid or process group does not exist. Note that an existing process "
1242 "might be a zombie, a process which already committed termination, but has "
1243 "not yet been B<wait>(2)ed for."
1247 #: build/C/man2/kill.2:122 build/C/man2/pause.2:59 build/C/man2/wait.2:423
1248 msgid "SVr4, 4.3BSD, POSIX.1-2001."
1252 #: build/C/man2/kill.2:130
1254 "The only signals that can be sent to process ID 1, the I<init> process, are "
1255 "those for which I<init> has explicitly installed signal handlers. This is "
1256 "done to assure the system is not brought down accidentally."
1260 #: build/C/man2/kill.2:136
1262 "POSIX.1-2001 requires that I<kill(-1,sig)> send I<sig> to all processes that "
1263 "the calling process may send signals to, except possibly for some "
1264 "implementation-defined system processes. Linux allows a process to signal "
1265 "itself, but on Linux the call I<kill(-1,sig)> does not signal the calling "
1270 #: build/C/man2/kill.2:146
1272 "POSIX.1-2001 requires that if a process sends a signal to itself, and the "
1273 "sending thread does not have the signal blocked, and no other thread has it "
1274 "unblocked or is waiting for it in B<sigwait>(3), at least one unblocked "
1275 "signal must be delivered to the sending thread before the B<kill>() "
1280 #: build/C/man2/kill.2:146 build/C/man3/sigpause.3:75 build/C/man2/wait.2:477
1285 #. In the 0.* kernels things chopped and changed quite
1286 #. a bit - MTK, 24 Jul 02
1288 #: build/C/man2/kill.2:160
1290 "Across different kernel versions, Linux has enforced different rules for the "
1291 "permissions required for an unprivileged process to send a signal to another "
1292 "process. In kernels 1.0 to 1.2.2, a signal could be sent if the effective "
1293 "user ID of the sender matched that of the receiver, or the real user ID of "
1294 "the sender matched that of the receiver. From kernel 1.2.3 until 1.3.77, a "
1295 "signal could be sent if the effective user ID of the sender matched either "
1296 "the real or effective user ID of the receiver. The current rules, which "
1297 "conform to POSIX.1-2001, were adopted in kernel 1.3.78."
1301 #: build/C/man2/kill.2:170
1303 "In 2.6 kernels up to and including 2.6.7, there was a bug that meant that "
1304 "when sending signals to a process group, B<kill>() failed with the error "
1305 "B<EPERM> if the caller did have permission to send the signal to I<any> "
1306 "(rather than I<all>) of the members of the process group. Notwithstanding "
1307 "this error return, the signal was still delivered to all of the processes "
1308 "for which the caller had permission to signal."
1312 #: build/C/man2/kill.2:180
1314 "B<_exit>(2), B<killpg>(2), B<signal>(2), B<tkill>(2), B<exit>(3), "
1315 "B<sigqueue>(3), B<capabilities>(7), B<credentials>(7), B<signal>(7)"
1319 #: build/C/man2/killpg.2:40
1325 #: build/C/man2/killpg.2:40 build/C/man3/sigset.3:24 build/C/man2/wait4.2:34
1331 #: build/C/man2/killpg.2:43
1332 msgid "killpg - send signal to a process group"
1336 #: build/C/man2/killpg.2:47
1337 msgid "B<int killpg(int >I<pgrp>B<, int >I<sig>B<);>"
1341 #: build/C/man2/killpg.2:54
1343 msgid "B<killpg>():"
1347 #: build/C/man2/killpg.2:58 build/C/man2/sigaltstack.2:44 build/C/man3/siginterrupt.3:49 build/C/man2/wait4.2:61
1349 "_BSD_SOURCE || _XOPEN_SOURCE\\ E<gt>=\\ 500 || _XOPEN_SOURCE\\ &&\\ "
1350 "_XOPEN_SOURCE_EXTENDED"
1354 #: build/C/man2/killpg.2:68
1356 "B<killpg>() sends the signal I<sig> to the process group I<pgrp>. See "
1357 "B<signal>(7) for a list of signals."
1361 #: build/C/man2/killpg.2:77
1363 "If I<pgrp> is 0, B<killpg>() sends the signal to the calling process's "
1364 "process group. (POSIX says: If I<pgrp> is less than or equal to 1, the "
1365 "behavior is undefined.)"
1369 #: build/C/man2/killpg.2:98
1370 msgid "I<Sig> is not a valid signal number."
1374 #: build/C/man2/killpg.2:106
1375 msgid "No process can be found in the process group specified by I<pgrp>."
1379 #: build/C/man2/killpg.2:110
1381 "The process group was given as 0 but the sending process does not have a "
1386 #: build/C/man2/killpg.2:114
1388 "SVr4, 4.4BSD (the B<killpg>() function call first appeared in 4BSD), "
1393 #: build/C/man2/killpg.2:128
1395 "There are various differences between the permission checking in BSD-type "
1396 "systems and System V-type systems. See the POSIX rationale for B<kill>(). "
1397 "A difference not mentioned by POSIX concerns the return value B<EPERM>: BSD "
1398 "documents that no signal is sent and B<EPERM> returned when the permission "
1399 "check failed for at least one target process, while POSIX documents B<EPERM> "
1400 "only when the permission check failed for all target processes."
1404 #: build/C/man2/killpg.2:133
1406 "On Linux, B<killpg>() is implemented as a library function that makes the "
1407 "call I<kill(-pgrp,\\ sig)>."
1411 #: build/C/man2/killpg.2:139
1413 "B<getpgrp>(2), B<kill>(2), B<signal>(2), B<capabilities>(7), "
1418 #: build/C/man2/pause.2:30
1424 #: build/C/man2/pause.2:30
1430 #: build/C/man2/pause.2:33
1431 msgid "pause - wait for signal"
1435 #: build/C/man2/pause.2:35 build/C/man3/profil.3:33
1436 msgid "B<#include E<lt>unistd.hE<gt>>"
1440 #: build/C/man2/pause.2:37
1441 msgid "B<int pause(void);>"
1445 #: build/C/man2/pause.2:42
1447 "B<pause>() causes the calling process (or thread) to sleep until a signal "
1448 "is delivered that either terminates the process or causes the invocation of "
1449 "a signal-catching function."
1452 #. .BR ERESTARTNOHAND .
1454 #: build/C/man2/pause.2:53
1456 "B<pause>() only returns when a signal was caught and the signal-catching "
1457 "function returned. In this case B<pause>() returns -1, and I<errno> is set "
1462 #: build/C/man2/pause.2:54 build/C/man2/sigsuspend.2:77 build/C/man2/sigwaitinfo.2:119 build/C/man2/wait.2:409
1468 #: build/C/man2/pause.2:57
1469 msgid "a signal was caught and the signal-catching function returned."
1473 #: build/C/man2/pause.2:64
1474 msgid "B<kill>(2), B<select>(2), B<signal>(2), B<sigsuspend>(2)"
1478 #: build/C/man2/prctl.2:48
1484 #: build/C/man2/prctl.2:48
1490 #: build/C/man2/prctl.2:51
1491 msgid "prctl - operations on a process"
1495 #: build/C/man2/prctl.2:54
1497 msgid "B<#include E<lt>sys/prctl.hE<gt>>\n"
1501 #: build/C/man2/prctl.2:57
1504 "B<int prctl(int >I<option>B<, unsigned long >I<arg2>B<, unsigned long "
1506 "B< unsigned long >I<arg4>B<, unsigned long >I<arg5>B<);>\n"
1510 #: build/C/man2/prctl.2:64
1512 "B<prctl>() is called with a first argument describing what to do (with "
1513 "values defined in I<E<lt>linux/prctl.hE<gt>>), and further arguments with a "
1514 "significance depending on the first one. The first argument can be:"
1518 #: build/C/man2/prctl.2:64
1520 msgid "B<PR_CAPBSET_READ> (since Linux 2.6.25)"
1524 #: build/C/man2/prctl.2:76
1526 "Return (as the function result) 1 if the capability specified in I<arg2> is "
1527 "in the calling thread's capability bounding set, or 0 if it is not. (The "
1528 "capability constants are defined in I<E<lt>linux/capability.hE<gt>>.) The "
1529 "capability bounding set dictates whether the process can receive the "
1530 "capability through a file's permitted capability set on a subsequent call to "
1535 #: build/C/man2/prctl.2:81
1537 "If the capability specified in I<arg2> is not valid, then the call fails "
1538 "with the error B<EINVAL>."
1542 #: build/C/man2/prctl.2:81
1544 msgid "B<PR_CAPBSET_DROP> (since Linux 2.6.25)"
1548 #: build/C/man2/prctl.2:90
1550 "If the calling thread has the B<CAP_SETPCAP> capability, then drop the "
1551 "capability specified by I<arg2> from the calling thread's capability "
1552 "bounding set. Any children of the calling thread will inherit the newly "
1553 "reduced bounding set."
1557 #: build/C/man2/prctl.2:102
1559 "The call fails with the error: B<EPERM> if the calling thread does not have "
1560 "the B<CAP_SETPCAP>; B<EINVAL> if I<arg2> does not represent a valid "
1561 "capability; or B<EINVAL> if file capabilities are not enabled in the kernel, "
1562 "in which case bounding sets are not supported."
1566 #: build/C/man2/prctl.2:102
1568 msgid "B<PR_SET_DUMPABLE> (since Linux 2.3.20)"
1571 #. See http://marc.theaimsgroup.com/?l=linux-kernel&m=115270289030630&w=2
1572 #. Subject: Fix prctl privilege escalation (CVE-2006-2451)
1573 #. From: Marcel Holtmann <marcel () holtmann ! org>
1574 #. Date: 2006-07-12 11:12:00
1576 #: build/C/man2/prctl.2:128
1578 "Set the state of the flag determining whether core dumps are produced for "
1579 "this process upon delivery of a signal whose default behavior is to produce "
1580 "a core dump. (Normally this flag is set for a process by default, but it is "
1581 "cleared when a set-user-ID or set-group-ID program is executed and also by "
1582 "various system calls that manipulate process UIDs and GIDs). In kernels up "
1583 "to and including 2.6.12, I<arg2> must be either 0 (process is not dumpable) "
1584 "or 1 (process is dumpable). Between kernels 2.6.13 and 2.6.17, the value 2 "
1585 "was also permitted, which caused any binary which normally would not be "
1586 "dumped to be dumped readable by root only; for security reasons, this "
1587 "feature has been removed. (See also the description of "
1588 "I</proc/sys/fs/suid_dumpable> in B<proc>(5).) Processes that are not "
1589 "dumpable can not be attached via B<ptrace(2)> B<PTRACE_ATTACH>."
1593 #: build/C/man2/prctl.2:128
1595 msgid "B<PR_GET_DUMPABLE> (since Linux 2.3.20)"
1598 #. Since Linux 2.6.13, the dumpable flag can have the value 2,
1599 #. but in 2.6.13 PR_GET_DUMPABLE simply returns 1 if the dumpable
1600 #. flags has a nonzero value. This was fixed in 2.6.14.
1602 #: build/C/man2/prctl.2:135
1604 "Return (as the function result) the current state of the calling process's "
1609 #: build/C/man2/prctl.2:135
1611 msgid "B<PR_SET_ENDIAN> (since Linux 2.6.18, PowerPC only)"
1614 #. Respectively 0, 1, 2
1616 #: build/C/man2/prctl.2:145
1618 "Set the endian-ness of the calling process to the value given in I<arg2>, "
1619 "which should be one of the following: B<PR_ENDIAN_BIG>, B<PR_ENDIAN_LITTLE>, "
1620 "or B<PR_ENDIAN_PPC_LITTLE> (PowerPC pseudo little endian)."
1624 #: build/C/man2/prctl.2:145
1626 msgid "B<PR_GET_ENDIAN> (since Linux 2.6.18, PowerPC only)"
1630 #: build/C/man2/prctl.2:150
1632 "Return the endian-ness of the calling process, in the location pointed to by "
1633 "I<(int\\ *) arg2>."
1637 #: build/C/man2/prctl.2:150
1639 msgid "B<PR_SET_FPEMU> (since Linux 2.4.18, 2.5.9, only on ia64)"
1643 #: build/C/man2/prctl.2:157
1645 "Set floating-point emulation control bits to I<arg2>. Pass "
1646 "B<PR_FPEMU_NOPRINT> to silently emulate fp operations accesses, or "
1647 "B<PR_FPEMU_SIGFPE> to not emulate fp operations and send B<SIGFPE> instead."
1651 #: build/C/man2/prctl.2:157
1653 msgid "B<PR_GET_FPEMU> (since Linux 2.4.18, 2.5.9, only on ia64)"
1657 #: build/C/man2/prctl.2:162
1659 "Return floating-point emulation control bits, in the location pointed to by "
1660 "I<(int\\ *) arg2>."
1664 #: build/C/man2/prctl.2:162
1666 msgid "B<PR_SET_FPEXC> (since Linux 2.4.21, 2.5.32, only on PowerPC)"
1670 #: build/C/man2/prctl.2:175
1672 "Set floating-point exception mode to I<arg2>. Pass B<PR_FP_EXC_SW_ENABLE> "
1673 "to use FPEXC for FP exception enables, B<PR_FP_EXC_DIV> for floating-point "
1674 "divide by zero, B<PR_FP_EXC_OVF> for floating-point overflow, "
1675 "B<PR_FP_EXC_UND> for floating-point underflow, B<PR_FP_EXC_RES> for "
1676 "floating-point inexact result, B<PR_FP_EXC_INV> for floating-point invalid "
1677 "operation, B<PR_FP_EXC_DISABLED> for FP exceptions disabled, "
1678 "B<PR_FP_EXC_NONRECOV> for async nonrecoverable exception mode, "
1679 "B<PR_FP_EXC_ASYNC> for async recoverable exception mode, "
1680 "B<PR_FP_EXC_PRECISE> for precise exception mode."
1684 #: build/C/man2/prctl.2:175
1686 msgid "B<PR_GET_FPEXC> (since Linux 2.4.21, 2.5.32, only on PowerPC)"
1690 #: build/C/man2/prctl.2:180
1692 "Return floating-point exception mode, in the location pointed to by I<(int\\ "
1697 #: build/C/man2/prctl.2:180
1699 msgid "B<PR_SET_KEEPCAPS> (since Linux 2.2.18)"
1703 #: build/C/man2/prctl.2:198
1705 "Set the state of the thread's \"keep capabilities\" flag, which determines "
1706 "whether the threads's permitted capability set is cleared when a change is "
1707 "made to the threads's user IDs such that the threads's real UID, effective "
1708 "UID, and saved set-user-ID all become nonzero when at least one of them "
1709 "previously had the value 0. By default, the permitted capability set is "
1710 "cleared when such a change is made; setting the \"keep capabilities\" flag "
1711 "prevents it from being cleared. I<arg2> must be either 0 (permitted "
1712 "capabilities are cleared) or 1 (permitted capabilities are kept). (A "
1713 "thread's I<effective> capability set is always cleared when such a "
1714 "credential change is made, regardless of the setting of the \"keep "
1715 "capabilities\" flag.) The \"keep capabilities\" value will be reset to 0 on "
1716 "subsequent calls to B<execve>(2)."
1720 #: build/C/man2/prctl.2:198
1722 msgid "B<PR_GET_KEEPCAPS> (since Linux 2.2.18)"
1726 #: build/C/man2/prctl.2:202
1728 "Return (as the function result) the current state of the calling threads's "
1729 "\"keep capabilities\" flag."
1733 #: build/C/man2/prctl.2:202
1735 msgid "B<PR_SET_NAME> (since Linux 2.6.9)"
1738 #. TASK_COMM_LEN in include/linux/sched.h
1740 #: build/C/man2/prctl.2:210
1742 "Set the process name for the calling process, using the value in the "
1743 "location pointed to by I<(char\\ *) arg2>. The name can be up to 16 bytes "
1744 "long, and should be null-terminated if it contains fewer bytes."
1748 #: build/C/man2/prctl.2:210
1750 msgid "B<PR_GET_NAME> (since Linux 2.6.11)"
1754 #: build/C/man2/prctl.2:217
1756 "Return the process name for the calling process, in the buffer pointed to by "
1757 "I<(char\\ *) arg2>. The buffer should allow space for up to 16 bytes; the "
1758 "returned string will be null-terminated if it is shorter than that."
1762 #: build/C/man2/prctl.2:217
1764 msgid "B<PR_SET_PDEATHSIG> (since Linux 2.1.57)"
1768 #: build/C/man2/prctl.2:228
1770 "Set the parent process death signal of the calling process to I<arg2> "
1771 "(either a signal value in the range 1..maxsig, or 0 to clear). This is the "
1772 "signal that the calling process will get when its parent dies. This value "
1773 "is cleared for the child of a B<fork>(2) and (since Linux 2.5.36 / 2.6.23) "
1774 "when executing a set-user_ID or set-group-ID binary."
1778 #: build/C/man2/prctl.2:228
1780 msgid "B<PR_GET_PDEATHSIG> (since Linux 2.3.15)"
1784 #: build/C/man2/prctl.2:233
1786 "Return the current value of the parent process death signal, in the location "
1787 "pointed to by I<(int\\ *) arg2>."
1791 #: build/C/man2/prctl.2:233
1793 msgid "B<PR_SET_SECCOMP> (since Linux 2.6.23)"
1796 #. See http://thread.gmane.org/gmane.linux.kernel/542632
1797 #. [PATCH 0 of 2] seccomp updates
1798 #. andrea@cpushare.com
1800 #: build/C/man2/prctl.2:257
1802 "Set the secure computing mode for the calling thread. In the current "
1803 "implementation, I<arg2> must be 1. After the secure computing mode has been "
1804 "set to 1, the only system calls that the thread is permitted to make are "
1805 "B<read>(2), B<write>(2), B<_exit>(2), and B<sigreturn>(2). Other system "
1806 "calls result in the delivery of a B<SIGKILL> signal. Secure computing mode "
1807 "is useful for number-crunching applications that may need to execute "
1808 "untrusted byte code, perhaps obtained by reading from a pipe or socket. "
1809 "This operation is only available if the kernel is configured with "
1810 "CONFIG_SECCOMP enabled."
1814 #: build/C/man2/prctl.2:257
1816 msgid "B<PR_GET_SECCOMP> (since Linux 2.6.23)"
1820 #: build/C/man2/prctl.2:270
1822 "Return the secure computing mode of the calling thread. Not very useful for "
1823 "the current implementation (mode equals 1), but may be useful for other "
1824 "possible future modes: if the caller is not in secure computing mode, this "
1825 "operation returns 0; if the caller is in secure computing mode, then the "
1826 "B<prctl>() call will cause a B<SIGKILL> signal to be sent to the process. "
1827 "This operation is only available if the kernel is configured with "
1828 "CONFIG_SECCOMP enabled."
1832 #: build/C/man2/prctl.2:270
1834 msgid "B<PR_SET_SECUREBITS> (since Linux 2.6.26)"
1838 #: build/C/man2/prctl.2:276
1840 "Set the \"securebits\" flags of the calling thread to the value supplied in "
1841 "I<arg2>. See B<capabilities>(7)."
1845 #: build/C/man2/prctl.2:276
1847 msgid "B<PR_GET_SECUREBITS> (since Linux 2.6.26)"
1851 #: build/C/man2/prctl.2:282
1853 "Return (as the function result) the \"securebits\" flags of the calling "
1854 "thread. See B<capabilities>(7)."
1858 #: build/C/man2/prctl.2:282
1860 msgid "B<PR_SET_TIMING> (since Linux 2.6.0-test4)"
1865 #. PR_TIMING_TIMESTAMP doesn't do anything in 2.6.26-rc8,
1866 #. and looking at the patch history, it appears
1867 #. that it never did anything.
1869 #: build/C/man2/prctl.2:299
1871 "Set whether to use (normal, traditional) statistical process timing or "
1872 "accurate timestamp-based process timing, by passing B<PR_TIMING_STATISTICAL> "
1873 "or B<PR_TIMING_TIMESTAMP> to I<arg2>. B<PR_TIMING_TIMESTAMP> is not "
1874 "currently implemented (attempting to set this mode will yield the error "
1879 #: build/C/man2/prctl.2:299
1881 msgid "B<PR_GET_TIMING> (since Linux 2.6.0-test4)"
1885 #: build/C/man2/prctl.2:303
1887 "Return (as the function result) which process timing method is currently in "
1892 #: build/C/man2/prctl.2:303
1894 msgid "B<PR_TASK_PERF_EVENTS_DISABLE> (since Linux 2.6.31)"
1898 #: build/C/man2/prctl.2:312
1900 "Disable all performance counters attached to the calling process, regardless "
1901 "of whether the counters were created by this process or another process. "
1902 "Performance counters created by the calling process for other processes are "
1903 "unaffected. For more information on performance counters, see the kernel "
1904 "source file I<tools/perf/design.txt>."
1907 #. commit 1d1c7ddbfab358445a542715551301b7fc363e28
1909 #: build/C/man2/prctl.2:318
1911 "Originally called B<PR_TASK_PERF_COUNTERS_DISABLE>; renamed (with same "
1912 "numerical value) in Linux 2.6.32."
1916 #: build/C/man2/prctl.2:318
1918 msgid "B<PR_TASK_PERF_EVENTS_ENABLE> (since Linux 2.6.31)"
1922 #: build/C/man2/prctl.2:323
1924 "The converse of B<PR_TASK_PERF_EVENTS_DISABLE>; enable performance counters "
1925 "attached to the calling process."
1928 #. commit 1d1c7ddbfab358445a542715551301b7fc363e28
1929 #. commit cdd6c482c9ff9c55475ee7392ec8f672eddb7be6
1931 #: build/C/man2/prctl.2:330
1932 msgid "Originally called B<PR_TASK_PERF_COUNTERS_ENABLE>; renamed in Linux 2.6.32."
1936 #: build/C/man2/prctl.2:330
1938 msgid "B<PR_SET_TSC> (since Linux 2.6.26, x86 only)"
1942 #: build/C/man2/prctl.2:343
1944 "Set the state of the flag determining whether the timestamp counter can be "
1945 "read by the process. Pass B<PR_TSC_ENABLE> to I<arg2> to allow it to be "
1946 "read, or B<PR_TSC_SIGSEGV> to generate a B<SIGSEGV> when the process tries "
1947 "to read the timestamp counter."
1951 #: build/C/man2/prctl.2:343
1953 msgid "B<PR_GET_TSC> (since Linux 2.6.26, x86 only)"
1957 #: build/C/man2/prctl.2:349
1959 "Return the state of the flag determining whether the timestamp counter can "
1960 "be read, in the location pointed to by I<(int\\ *) arg2>."
1964 #: build/C/man2/prctl.2:349
1966 msgid "B<PR_SET_UNALIGN>"
1970 #: build/C/man2/prctl.2:359
1972 "(Only on: ia64, since Linux 2.3.48; parisc, since Linux 2.6.15; PowerPC, "
1973 "since Linux 2.6.18; Alpha, since Linux 2.6.22) Set unaligned access control "
1974 "bits to I<arg2>. Pass B<PR_UNALIGN_NOPRINT> to silently fix up unaligned "
1975 "user accesses, or B<PR_UNALIGN_SIGBUS> to generate B<SIGBUS> on unaligned "
1980 #: build/C/man2/prctl.2:359
1982 msgid "B<PR_GET_UNALIGN>"
1986 #: build/C/man2/prctl.2:366
1988 "(see B<PR_SET_UNALIGN> for information on versions and architectures) "
1989 "Return unaligned access control bits, in the location pointed to by I<(int\\ "
1994 #: build/C/man2/prctl.2:366
1996 msgid "B<PR_MCE_KILL> (since Linux 2.6.32)"
2000 #: build/C/man2/prctl.2:406
2002 "Set the machine check memory corruption kill policy for the current thread. "
2003 "If I<arg2> is B<PR_MCE_KILL_CLEAR>, clear the thread memory corruption kill "
2004 "policy and use the system-wide default. (The system-wide default is defined "
2005 "by I</proc/sys/vm/memory_failure_early_kill>; see B<proc>(5).) If I<arg2> "
2006 "is B<PR_MCE_KILL_SET>, use a thread-specific memory corruption kill policy. "
2007 "In this case, I<arg3> defines whether the policy is I<early kill> "
2008 "(B<PR_MCE_KILL_EARLY>), I<late kill> (B<PR_MCE_KILL_LATE>), or the "
2009 "system-wide default (B<PR_MCE_KILL_DEFAULT>). Early kill means that the "
2010 "thread receives a B<SIGBUS> signal as soon as hardware memory corruption is "
2011 "detected inside its address space. In late kill mode, the process is only "
2012 "killed when it accesses a corrupted page. See B<sigaction>(2) for more "
2013 "information on the B<SIGBUS> signal. The policy is inherited by children. "
2014 "The remaining unused B<prctl>() arguments must be zero for future "
2019 #: build/C/man2/prctl.2:406
2021 msgid "B<PR_MCE_KILL_GET> (since Linux 2.6.32)"
2025 #: build/C/man2/prctl.2:412
2027 "Return the current per-process machine check kill policy. All unused "
2028 "B<prctl>() arguments must be zero."
2032 #: build/C/man2/prctl.2:412
2034 msgid "B<PR_SET_MM> (since Linux 3.3)"
2038 #: build/C/man2/prctl.2:432
2040 "Modify certain kernel memory map descriptor fields of the calling process. "
2041 "Usually these fields are set by the kernel and dynamic loader (see "
2042 "B<ld.so>(8) for more information) and a regular application should not use "
2043 "this feature. However, there are cases, such as self-modifying programs, "
2044 "where a program might find it useful to change its own memory map. This "
2045 "feature is available only if the kernel is built with the "
2046 "B<CONFIG_CHECKPOINT_RESTORE> option enabled. The calling process must have "
2047 "the B<CAP_SYS_RESOURCE> capability. The value in I<arg2> is one of the "
2048 "options below, while I<arg3> provides a new value for the option."
2052 #: build/C/man2/prctl.2:433
2054 msgid "B<PR_SET_MM_START_CODE>"
2058 #: build/C/man2/prctl.2:442
2060 "Set the address above which the program text can run. The corresponding "
2061 "memory area must be readable and executable, but not writable or sharable "
2062 "(see B<mprotect>(2) and B<mmap>(2) for more information)."
2066 #: build/C/man2/prctl.2:442
2068 msgid "B<PR_SET_MM_END_CODE>"
2072 #: build/C/man2/prctl.2:447
2074 "Set the address below which the program text can run. The corresponding "
2075 "memory area must be readable and executable, but not writable or sharable."
2079 #: build/C/man2/prctl.2:447
2081 msgid "B<PR_SET_MM_START_DATA>"
2085 #: build/C/man2/prctl.2:453
2087 "Set the address above which initialized and uninitialized (bss) data are "
2088 "placed. The corresponding memory area must be readable and writable, but "
2089 "not executable or sharable."
2093 #: build/C/man2/prctl.2:453
2095 msgid "B<PR_SET_MM_END_DATA>"
2099 #: build/C/man2/prctl.2:459
2101 "Set the address below which initialized and uninitialized (bss) data are "
2102 "placed. The corresponding memory area must be readable and writable, but "
2103 "not executable or sharable."
2107 #: build/C/man2/prctl.2:459
2109 msgid "B<PR_SET_MM_START_STACK>"
2113 #: build/C/man2/prctl.2:463
2115 "Set the start address of the stack. The corresponding memory area must be "
2116 "readable and writable."
2120 #: build/C/man2/prctl.2:463
2122 msgid "B<PR_SET_MM_START_BRK>"
2126 #: build/C/man2/prctl.2:475
2128 "Set the address above which the program heap can be expanded with B<brk>(2) "
2129 "call. The address must be greater than the ending address of the current "
2130 "program data segment. In addition, the combined size of the resulting heap "
2131 "and the size of the data segment can't exceed the B<RLIMIT_DATA> resource "
2132 "limit (see B<setrlimit>(2))."
2136 #: build/C/man2/prctl.2:475
2138 msgid "B<PR_SET_MM_BRK>"
2141 #. FIXME The following (until ========) is not yet in mainline kernel,
2142 #. so commented out for the moment.
2144 #. .BR PR_SET_MM_ARG_START
2145 #. Set the address above which the program command line is placed.
2147 #. .BR PR_SET_MM_ARG_END
2148 #. Set the address below which the program command line is placed.
2150 #. .BR PR_SET_MM_ENV_START
2151 #. Set the address above which the program environment is placed.
2153 #. .BR PR_SET_MM_ENV_END
2154 #. Set the address below which the program environment is placed.
2156 #. The address passed with
2157 #. .BR PR_SET_MM_ARG_START ,
2158 #. .BR PR_SET_MM_ARG_END ,
2159 #. .BR PR_SET_MM_ENV_START ,
2161 #. .BR PR_SET_MM_ENV_END
2162 #. should belong to a process stack area.
2163 #. Thus, the corresponding memory area must be readable, writable, and
2164 #. (depending on the kernel configuration) have the
2165 #. .BR MAP_GROWSDOWN
2166 #. attribute set (see
2169 #. .BR PR_SET_MM_AUXV
2170 #. Set a new auxiliary vector.
2173 #. argument should provide the address of the vector.
2176 #. is the size of the vector.
2178 #. .BR PR_SET_MM_EXE_FILE
2180 #. .IR /proc/pid/exe
2181 #. symbolic link with a new one pointing to a new executable file
2182 #. identified by the file descriptor provided in
2185 #. The file descriptor should be obtained with a regular
2189 #. To change the symbolic link, one needs to unmap all existing
2190 #. executable memory areas, including those created by the kernel itself
2191 #. (for example the kernel usually creates at least one executable
2192 #. memory area for the ELF
2196 #. The second limitation is that such transitions can be done only once
2197 #. in a process life time.
2198 #. Any further attempts will be rejected.
2199 #. This should help system administrators to monitor unusual
2200 #. symbolic-link transitions over all process running in a system.
2201 #. ========== END FIXME
2203 #: build/C/man2/prctl.2:544
2205 "Set the current B<brk>(2) value. The requirements for the address are the "
2206 "same as for the B<PR_SET_MM_START_BRK> option."
2210 #: build/C/man2/prctl.2:563
2212 "On success, B<PR_GET_DUMPABLE>, B<PR_GET_KEEPCAPS>, B<PR_CAPBSET_READ>, "
2213 "B<PR_GET_TIMING>, B<PR_GET_SECUREBITS>, B<PR_MCE_KILL_GET>, and (if it "
2214 "returns) B<PR_GET_SECCOMP> return the nonnegative values described above. "
2215 "All other I<option> values return 0 on success. On error, -1 is returned, "
2216 "and I<errno> is set appropriately."
2220 #: build/C/man2/prctl.2:568
2221 msgid "I<arg2> is an invalid address."
2225 #: build/C/man2/prctl.2:573
2226 msgid "The value of I<option> is not recognized."
2230 #: build/C/man2/prctl.2:585
2232 "I<option> is B<PR_MCE_KILL> or B<PR_MCE_KILL_GET> or B<PR_SET_MM>, and "
2233 "unused B<prctl>() arguments were not specified as zero."
2237 #: build/C/man2/prctl.2:590
2238 msgid "I<arg2> is not valid value for this I<option>."
2242 #: build/C/man2/prctl.2:599
2244 "I<option> is B<PR_SET_SECCOMP> or B<PR_SET_SECCOMP>, and the kernel was not "
2245 "configured with B<CONFIG_SECCOMP>."
2249 #: build/C/man2/prctl.2:605
2250 msgid "I<option> is B<PR_SET_MM>, and one of the following is true"
2254 #: build/C/man2/prctl.2:611
2255 msgid "I<arg4> or I<arg5> is nonzero;"
2259 #: build/C/man2/prctl.2:616
2261 "I<arg3> is greater than B<TASK_SIZE> (the limit on the size of the user "
2262 "address space for this architecture);"
2266 #: build/C/man2/prctl.2:626
2268 "I<arg2> is B<PR_SET_MM_START_CODE>, B<PR_SET_MM_END_CODE>, "
2269 "B<PR_SET_MM_START_DATA>, B<PR_SET_MM_END_DATA>, or B<PR_SET_MM_START_STACK,> "
2270 "and the permissions of the corresponding memory area are not as required;"
2274 #: build/C/man2/prctl.2:638
2276 "I<arg2> is B<PR_SET_MM_START_BRK> or B<PR_SET_MM_BRK>, and I<arg3> is less "
2277 "than or equal to the end of the data segment or specifies a value that would "
2278 "cause the B<RLIMIT_DATA> resource limit to be exceeded."
2282 #: build/C/man2/prctl.2:651
2284 "I<option> is B<PR_SET_SECUREBITS>, and the caller does not have the "
2285 "B<CAP_SETPCAP> capability, or tried to unset a \"locked\" flag, or tried to "
2286 "set a flag whose corresponding locked flag was set (see B<capabilities>(7))."
2290 #: build/C/man2/prctl.2:661
2292 "I<option> is B<PR_SET_KEEPCAPS>, and the callers's "
2293 "B<SECURE_KEEP_CAPS_LOCKED> flag is set (see B<capabilities>(7))."
2297 #: build/C/man2/prctl.2:669
2299 "I<option> is B<PR_CAPBSET_DROP>, and the caller does not have the "
2300 "B<CAP_SETPCAP> capability."
2303 #. FIXME The following (until ========) is not yet in mainline kernel,
2304 #. so commented out for the moment.
2313 #. .BR PR_SET_MM_EXE_FILE ,
2314 #. the file is not executable.
2322 #. .BR PR_SET_MM_EXE_FILE ,
2323 #. and this the second attempt to change the
2325 #. symbolic link, which is prohibited.
2333 #. .BR PR_SET_MM_EXE_FILE ,
2334 #. and the file descriptor passed in
2337 #. ========== END FIXME
2338 #. The following can't actually happen, because prctl() in
2339 #. seccomp mode will cause SIGKILL.
2344 #. .BR PR_SET_SECCOMP ,
2345 #. and secure computing mode is already 1.
2347 #: build/C/man2/prctl.2:720
2349 "I<option> is B<PR_SET_MM>, and the caller does not have the "
2350 "B<CAP_SYS_RESOURCE> capability."
2353 #. The library interface was added in glibc 2.0.6
2355 #: build/C/man2/prctl.2:725
2356 msgid "The B<prctl>() system call was introduced in Linux 2.1.57."
2360 #: build/C/man2/prctl.2:732
2362 "This call is Linux-specific. IRIX has a B<prctl>() system call (also "
2363 "introduced in Linux 2.1.44 as irix_prctl on the MIPS architecture), with "
2368 #: build/C/man2/prctl.2:734
2369 msgid "B<ptrdiff_t prctl(int >I<option>B<, int >I<arg2>B<, int >I<arg3>B<);>"
2373 #: build/C/man2/prctl.2:739
2375 "and options to get the maximum number of processes per user, get the maximum "
2376 "number of processors the calling process can use, find out whether a "
2377 "specified process is currently blocked, get or set the maximum stack size, "
2382 #: build/C/man2/prctl.2:742
2383 msgid "B<signal>(2), B<core>(5)"
2387 #: build/C/man3/profil.3:28
2393 #: build/C/man3/profil.3:31
2394 msgid "profil - execution time profile"
2398 #: build/C/man3/profil.3:36
2400 "B<int profil(unsigned short *>I<buf>B<, size_t >I<bufsiz>B<, size_t "
2401 ">I<offset>B<, unsigned int >I<scale>B<);>"
2405 #: build/C/man3/profil.3:44
2406 msgid "B<profil>(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE\\ E<lt>\\ 500)"
2410 #: build/C/man3/profil.3:66
2412 "This routine provides a means to find out in what areas your program spends "
2413 "most of its time. The argument I<buf> points to I<bufsiz> bytes of core. "
2414 "Every virtual 10 milliseconds, the user's program counter (PC) is examined: "
2415 "I<offset> is subtracted and the result is multiplied by I<scale> and divided "
2416 "by 65536. If the resulting value is less than I<bufsiz>, then the "
2417 "corresponding entry in I<buf> is incremented. If I<buf> is NULL, profiling "
2422 #: build/C/man3/profil.3:68
2423 msgid "Zero is always returned."
2427 #: build/C/man3/profil.3:70
2428 msgid "Similar to a call in SVr4 (but not POSIX.1-2001)."
2432 #: build/C/man3/profil.3:76
2434 "B<profil>() cannot be used on a program that also uses B<ITIMER_PROF> "
2435 "interval timers (see B<setitimer>(2))."
2439 #: build/C/man3/profil.3:79
2441 "True kernel profiling provides more accurate results. Libc 4.4 contained a "
2442 "kernel patch providing a system call profil."
2446 #: build/C/man3/profil.3:84
2447 msgid "B<gprof>(1), B<setitimer>(2), B<sigaction>(2), B<signal>(2)"
2451 #: build/C/man3/psignal.3:28
2457 #: build/C/man3/psignal.3:28
2463 #: build/C/man3/psignal.3:28 build/C/man3/raise.3:27 build/C/man7/sigevent.7:24
2469 #: build/C/man3/psignal.3:31
2470 msgid "psignal, psiginfo - print signal message"
2474 #: build/C/man3/psignal.3:37
2477 "B<void psignal(int >I<sig>B<, const char *>I<s>B<);>\n"
2478 "B<void psiginfo(const siginfo_t *>I<pinfo>B<, const char *>I<s>B<);>\n"
2482 #: build/C/man3/psignal.3:39
2484 msgid "B<extern const char *const >I<sys_siglist>B<[];>\n"
2488 #: build/C/man3/psignal.3:48
2489 msgid "B<psignal>(): _SVID_SOURCE || _BSD_SOURCE"
2493 #: build/C/man3/psignal.3:51
2495 "B<psiginfo>(): _XOPEN_SOURCE\\ E<gt>=\\ 700 || _POSIX_C_SOURCE\\ E<gt>=\\ "
2500 #: build/C/man3/psignal.3:54
2501 msgid "I<sys_siglist>: _BSD_SOURCE"
2505 #: build/C/man3/psignal.3:63
2507 "The B<psignal>() function displays a message on I<stderr> consisting of the "
2508 "string I<s>, a colon, a space, a string describing the signal number I<sig>, "
2509 "and a trailing newline. If the string I<s> is NULL or empty, the colon and "
2510 "space are omitted. If I<sig> is invalid, the message displayed will "
2511 "indicate an unknown signal."
2515 #: build/C/man3/psignal.3:84
2517 "The B<psiginfo>() function is like B<psignal>(), except that it displays "
2518 "information about the signal described by I<pinfo>, which should point to a "
2519 "valid I<siginfo_t> structure. As well as the signal description, "
2520 "B<psiginfo>() displays information about the origin of the signal, and "
2521 "other information relevant to the signal (e.g., the relevant memory address "
2522 "for hardware-generated signals, the child process ID for B<SIGCHLD>, and the "
2523 "user ID and process ID of the sender, for signals set using B<kill>(2) or "
2528 #: build/C/man3/psignal.3:87
2530 "The array I<sys_siglist> holds the signal description strings indexed by "
2535 #: build/C/man3/psignal.3:93
2536 msgid "The B<psignal>() and B<psiginfo>() functions return no value."
2540 #: build/C/man3/psignal.3:97
2541 msgid "The B<psiginfo>() function was added to glibc in version 2.10."
2545 #: build/C/man3/psignal.3:99
2546 msgid "POSIX.1-2008, 4.3BSD."
2550 #: build/C/man3/psignal.3:103
2551 msgid "In glibc versions up to 2.12, B<psiginfo>() had the following bugs:"
2554 #. FIXME http://sourceware.org/bugzilla/show_bug.cgi?id=12107
2555 #. Reportedly now fixed; check glibc 2.13
2557 #: build/C/man3/psignal.3:107
2558 msgid "In some circumstances, a trailing newline is not printed."
2561 #. FIXME http://sourceware.org/bugzilla/show_bug.cgi?id=12108
2562 #. Reportedly now fixed; check glibc 2.13
2564 #: build/C/man3/psignal.3:111
2565 msgid "Additional details are not displayed for real-time signals."
2569 #: build/C/man3/psignal.3:116
2570 msgid "B<sigaction>(2), B<perror>(3), B<strsignal>(3), B<signal>(7)"
2574 #: build/C/man3/raise.3:27
2580 #: build/C/man3/raise.3:27
2586 #: build/C/man3/raise.3:30
2587 msgid "raise - send a signal to the caller"
2591 #: build/C/man3/raise.3:35
2593 msgid "B<int raise(int >I<sig>B<);>\n"
2597 #: build/C/man3/raise.3:41
2599 "The B<raise>() function sends a signal to the calling process or thread. "
2600 "In a single-threaded program it is equivalent to"
2604 #: build/C/man3/raise.3:45
2606 msgid "kill(getpid(), sig);\n"
2610 #: build/C/man3/raise.3:49
2611 msgid "In a multithreaded program it is equivalent to"
2615 #: build/C/man3/raise.3:53
2617 msgid "pthread_kill(pthread_self(), sig);\n"
2621 #: build/C/man3/raise.3:59
2623 "If the signal causes a handler to be called, B<raise>() will only return "
2624 "after the signal handler has returned."
2628 #: build/C/man3/raise.3:62
2629 msgid "B<raise>() returns 0 on success, and nonzero for failure."
2633 #: build/C/man3/raise.3:64 build/C/man2/signal.2:107
2634 msgid "C89, C99, POSIX.1-2001."
2637 #. 2.3.2 used the obsolete tkill(), if available.
2639 #: build/C/man3/raise.3:75
2641 "Since version 2.3.3, glibc implements B<raise>() by calling B<tgkill>(2), "
2642 "if the kernel supports that system call. Older glibc versions implemented "
2643 "B<raise>() using B<kill>(2)."
2647 #: build/C/man3/raise.3:82
2649 "B<getpid>(2), B<kill>(2), B<sigaction>(2), B<signal>(2), B<pthread_kill>(3), "
2654 #: build/C/man2/rt_sigqueueinfo.2:23
2656 msgid "RT_SIGQUEUEINFO"
2660 #: build/C/man2/rt_sigqueueinfo.2:23 build/C/man2/tkill.2:29
2666 #: build/C/man2/rt_sigqueueinfo.2:26
2667 msgid "rt_sigqueueinfo, rt_tgsigqueueinfo - queue a signal and data"
2671 #: build/C/man2/rt_sigqueueinfo.2:29
2674 "B<int rt_sigqueueinfo(pid_t >I<tgid>B<, int >I<sig>B<, siginfo_t "
2679 #: build/C/man2/rt_sigqueueinfo.2:32
2682 "B<int rt_tgsigqueueinfo(pid_t >I<tgid>B<, pid_t >I<tid>B<, int >I<sig>B<,>\n"
2683 "B< siginfo_t *>I<uinfo>B<);>\n"
2687 #: build/C/man2/rt_sigqueueinfo.2:45
2689 "The B<rt_sigqueueinfo>() and B<rt_tgsigqueueinfo>() system calls are the "
2690 "low-level interfaces used to send a signal plus data to a process or "
2691 "thread. The receiver of the signal can obtain the accompanying data by "
2692 "establishing a signal handler with the B<sigaction>(2) B<SA_SIGINFO> flag."
2696 #: build/C/man2/rt_sigqueueinfo.2:51
2698 "These system calls are not intended for direct application use; they are "
2699 "provided to allow the implementation of B<sigqueue>(3) and "
2700 "B<pthread_sigqueue>(3)."
2704 #: build/C/man2/rt_sigqueueinfo.2:63
2706 "The B<rt_sigqueueinfo>() system call sends the signal I<sig> to the thread "
2707 "group with the ID I<tgid>. (The term \"thread group\" is synonymous with "
2708 "\"process\", and I<tid> corresponds to the traditional UNIX process ID.) "
2709 "The signal will be delivered to an arbitrary member of the thread group "
2710 "(i.e., one of the threads that is not currently blocking the signal)."
2714 #: build/C/man2/rt_sigqueueinfo.2:74
2716 "The I<uinfo> argument specifies the data to accompany the signal. This "
2717 "argument is a pointer to a structure of type I<siginfo_t>, described in "
2718 "B<sigaction>(2) (and defined by including I<E<lt>sigaction.hE<gt>>). The "
2719 "caller should set the following fields in this structure:"
2723 #: build/C/man2/rt_sigqueueinfo.2:74 build/C/man7/sigevent.7:86 build/C/man2/wait.2:315
2730 #: build/C/man2/rt_sigqueueinfo.2:90
2732 "This must be one of the B<SI_*> codes in the kernel source file "
2733 "I<include/asm-generic/siginfo.h>, with the restriction that the code must be "
2734 "negative (i.e., cannot be B<SI_USER>, which is used by the kernel to "
2735 "indicate a signal sent by B<kill>(2)) and cannot (since Linux 2.6.39) be "
2736 "B<SI_TKILL> (which is used by the kernel to indicate a signal sent using "
2741 #: build/C/man2/rt_sigqueueinfo.2:90 build/C/man2/wait.2:294
2747 #: build/C/man2/rt_sigqueueinfo.2:94
2748 msgid "This should be set to a process ID, typically the process ID of the sender."
2752 #: build/C/man2/rt_sigqueueinfo.2:94 build/C/man2/wait.2:297
2758 #: build/C/man2/rt_sigqueueinfo.2:98
2759 msgid "This should be set to a user ID, typically the real user ID of the sender."
2763 #: build/C/man2/rt_sigqueueinfo.2:98 build/C/man7/sigevent.7:94
2769 #: build/C/man2/rt_sigqueueinfo.2:105
2771 "This field contains the user data to accompany the signal. For more "
2772 "information, see the description of the last (I<union sigval>) argument of "
2777 #: build/C/man2/rt_sigqueueinfo.2:112
2779 "Internally, the kernel sets the I<si_signo> field to the value specified in "
2780 "I<sig>, so that the receiver of the signal can also obtain the signal number "
2785 #: build/C/man2/rt_sigqueueinfo.2:124
2787 "The B<rt_tgsigqueueinfo>() system call is like B<rt_sigqueueinfo>(), but "
2788 "sends the signal and data to the single thread specified by the combination "
2789 "of I<tgid>, a thread group ID, and I<tid>, a thread in that thread group."
2793 #: build/C/man2/rt_sigqueueinfo.2:129
2795 "On success, these system calls return 0. On error, they return -1 and "
2796 "I<errno> is set to indicate the error."
2800 #: build/C/man2/rt_sigqueueinfo.2:130 build/C/man3/sigqueue.3:90 build/C/man2/sigwaitinfo.2:111 build/C/man2/timer_create.2:174
2806 #: build/C/man2/rt_sigqueueinfo.2:136 build/C/man3/sigqueue.3:96
2808 "The limit of signals which may be queued has been reached. (See "
2809 "B<signal>(7) for further information.)"
2813 #: build/C/man2/rt_sigqueueinfo.2:143
2814 msgid "I<sig>, I<tgid>, or I<tid> was invalid."
2818 #: build/C/man2/rt_sigqueueinfo.2:151
2820 "The caller does not have permission to send the signal to the target. For "
2821 "the required permissions, see B<kill>(2). Or: I<uinfo-E<gt>si_code> is "
2826 #: build/C/man2/rt_sigqueueinfo.2:157
2827 msgid "B<rt_sigqueueinfo>(): No thread group matching I<tgid> was found."
2831 #: build/C/man2/rt_sigqueueinfo.2:164
2832 msgid "B<rt_tgsigqueinfo>(): No thread matching I<tgid> and I<tid> was found."
2836 #: build/C/man2/rt_sigqueueinfo.2:171
2838 "The B<rt_sigqueueinfo>() system call was added to Linux in version 2.2. "
2839 "The B<rt_tgsigqueueinfo>() system call was added to Linux in version "
2844 #: build/C/man2/rt_sigqueueinfo.2:173 build/C/man2/sgetmask.2:63 build/C/man2/timerfd_create.2:372
2845 msgid "These system calls are Linux-specific."
2849 #: build/C/man2/rt_sigqueueinfo.2:178
2851 "Since these system calls are not intended for application use, there are no "
2852 "glibc wrapper functions; use B<syscall>(2) in the unlikely case that you "
2853 "want to call them directly."
2857 #: build/C/man2/rt_sigqueueinfo.2:183
2859 "As with B<kill>(2), the null signal (0) can be used to check if the "
2860 "specified process or thread exists."
2864 #: build/C/man2/rt_sigqueueinfo.2:191
2866 "B<kill>(2), B<sigaction>(2), B<sigprocmask>(2), B<tgkill>(2), "
2867 "B<pthread_sigqueue>(3), B<sigqueue>(3), B<signal>(7)"
2871 #: build/C/man2/sgetmask.2:24
2877 #: build/C/man2/sgetmask.2:24
2883 #: build/C/man2/sgetmask.2:27
2884 msgid "sgetmask, ssetmask - manipulation of signal mask (obsolete)"
2888 #: build/C/man2/sgetmask.2:29
2889 msgid "B<long sgetmask(void);>"
2893 #: build/C/man2/sgetmask.2:31
2894 msgid "B<long ssetmask(long >I<newmask>B<);>"
2898 #: build/C/man2/sgetmask.2:37
2900 "These system calls are obsolete. I<Do not use them>; use B<sigprocmask>(2) "
2905 #: build/C/man2/sgetmask.2:40
2906 msgid "B<sgetmask>() returns the signal mask of the calling process."
2910 #: build/C/man2/sgetmask.2:45
2912 "B<ssetmask>() sets the signal mask of the calling process to the value "
2913 "given in I<newmask>. The previous signal mask is returned."
2917 #: build/C/man2/sgetmask.2:54
2919 "The signal masks dealt with by these two system calls are plain bit masks "
2920 "(unlike the I<sigset_t> used by B<sigprocmask>(2)); use B<sigmask>(3) to "
2921 "create and inspect these masks."
2925 #: build/C/man2/sgetmask.2:59
2927 "B<sgetmask>() always successfully returns the signal mask. B<ssetmask>() "
2928 "always succeeds, and returns the previous signal mask."
2932 #: build/C/man2/sgetmask.2:61
2933 msgid "These system calls always succeed."
2937 #: build/C/man2/sgetmask.2:66
2938 msgid "Glibc does not provide wrappers for these system calls; use B<syscall>(2)."
2942 #: build/C/man2/sgetmask.2:69
2944 "These system calls are unaware of signal numbers greater than 31 (i.e., "
2945 "real-time signals)."
2949 #: build/C/man2/sgetmask.2:74
2950 msgid "It is not possible to block B<SIGSTOP> or B<SIGKILL>."
2954 #: build/C/man2/sgetmask.2:77
2955 msgid "B<sigprocmask>(2), B<signal>(7)"
2959 #: build/C/man2/sigaction.2:45
2965 #: build/C/man2/sigaction.2:45
2971 #: build/C/man2/sigaction.2:48
2972 msgid "sigaction - examine and change a signal action"
2976 #: build/C/man2/sigaction.2:54
2979 "B<int sigaction(int >I<signum>B<, const struct sigaction *>I<act>B<,>\n"
2980 "B< struct sigaction *>I<oldact>B<);>\n"
2984 #: build/C/man2/sigaction.2:64
2986 "B<sigaction>(): _POSIX_C_SOURCE\\ E<gt>=\\ 1 || _XOPEN_SOURCE || "
2991 #: build/C/man2/sigaction.2:73
2993 "The B<sigaction>() system call is used to change the action taken by a "
2994 "process on receipt of a specific signal. (See B<signal>(7) for an overview "
2999 #: build/C/man2/sigaction.2:79
3001 "I<signum> specifies the signal and can be any valid signal except B<SIGKILL> "
3006 #: build/C/man2/sigaction.2:90
3008 "If I<act> is non-NULL, the new action for signal I<signum> is installed from "
3009 "I<act>. If I<oldact> is non-NULL, the previous action is saved in "
3014 #: build/C/man2/sigaction.2:94
3015 msgid "The I<sigaction> structure is defined as something like:"
3019 #: build/C/man2/sigaction.2:104
3022 "struct sigaction {\n"
3023 " void (*sa_handler)(int);\n"
3024 " void (*sa_sigaction)(int, siginfo_t *, void *);\n"
3025 " sigset_t sa_mask;\n"
3027 " void (*sa_restorer)(void);\n"
3032 #: build/C/man2/sigaction.2:111
3034 "On some architectures a union is involved: do not assign to both "
3035 "I<sa_handler> and I<sa_sigaction>."
3039 #: build/C/man2/sigaction.2:118
3041 "The I<sa_restorer> element is obsolete and should not be used. POSIX does "
3042 "not specify a I<sa_restorer> element."
3046 #: build/C/man2/sigaction.2:128
3048 "I<sa_handler> specifies the action to be associated with I<signum> and may "
3049 "be B<SIG_DFL> for the default action, B<SIG_IGN> to ignore this signal, or a "
3050 "pointer to a signal handling function. This function receives the signal "
3051 "number as its only argument."
3055 #: build/C/man2/sigaction.2:150
3057 "If B<SA_SIGINFO> is specified in I<sa_flags>, then I<sa_sigaction> (instead "
3058 "of I<sa_handler>) specifies the signal-handling function for I<signum>. "
3059 "This function receives the signal number as its first argument, a pointer to "
3060 "a I<siginfo_t> as its second argument and a pointer to a I<ucontext_t> (cast "
3061 "to I<void\\ *>) as its third argument. (Commonly, the handler function "
3062 "doesn't make any use of the third argument. See B<getcontext>(2) for "
3063 "further information about I<ucontext_t>.)"
3067 #: build/C/man2/sigaction.2:160
3069 "I<sa_mask> specifies a mask of signals which should be blocked (i.e., added "
3070 "to the signal mask of the thread in which the signal handler is invoked) "
3071 "during execution of the signal handler. In addition, the signal which "
3072 "triggered the handler will be blocked, unless the B<SA_NODEFER> flag is "
3077 #: build/C/man2/sigaction.2:164
3079 "I<sa_flags> specifies a set of flags which modify the behavior of the "
3080 "signal. It is formed by the bitwise OR of zero or more of the following:"
3084 #: build/C/man2/sigaction.2:165
3086 msgid "B<SA_NOCLDSTOP>"
3090 #: build/C/man2/sigaction.2:182
3092 "If I<signum> is B<SIGCHLD>, do not receive notification when child processes "
3093 "stop (i.e., when they receive one of B<SIGSTOP>, B<SIGTSTP>, B<SIGTTIN> or "
3094 "B<SIGTTOU>) or resume (i.e., they receive B<SIGCONT>) (see B<wait>(2)). "
3095 "This flag is only meaningful when establishing a handler for B<SIGCHLD>."
3099 #: build/C/man2/sigaction.2:182
3101 msgid "B<SA_NOCLDWAIT> (since Linux 2.6)"
3104 #. To be precise: Linux 2.5.60 -- MTK
3106 #: build/C/man2/sigaction.2:196
3108 "If I<signum> is B<SIGCHLD>, do not transform children into zombies when they "
3109 "terminate. See also B<waitpid>(2). This flag is only meaningful when "
3110 "establishing a handler for B<SIGCHLD>, or when setting that signal's "
3111 "disposition to B<SIG_DFL>."
3115 #: build/C/man2/sigaction.2:208
3117 "If the B<SA_NOCLDWAIT> flag is set when establishing a handler for "
3118 "B<SIGCHLD>, POSIX.1 leaves it unspecified whether a B<SIGCHLD> signal is "
3119 "generated when a child process terminates. On Linux, a B<SIGCHLD> signal is "
3120 "generated in this case; on some other implementations, it is not."
3124 #: build/C/man2/sigaction.2:208
3126 msgid "B<SA_NODEFER>"
3130 #: build/C/man2/sigaction.2:215
3132 "Do not prevent the signal from being received from within its own signal "
3133 "handler. This flag is only meaningful when establishing a signal handler. "
3134 "B<SA_NOMASK> is an obsolete, nonstandard synonym for this flag."
3138 #: build/C/man2/sigaction.2:215
3140 msgid "B<SA_ONSTACK>"
3144 #: build/C/man2/sigaction.2:221
3146 "Call the signal handler on an alternate signal stack provided by "
3147 "B<sigaltstack>(2). If an alternate stack is not available, the default "
3148 "stack will be used. This flag is only meaningful when establishing a signal "
3153 #: build/C/man2/sigaction.2:221
3155 msgid "B<SA_RESETHAND>"
3159 #: build/C/man2/sigaction.2:228
3161 "Restore the signal action to the default state once the signal handler has "
3162 "been called. This flag is only meaningful when establishing a signal "
3163 "handler. B<SA_ONESHOT> is an obsolete, nonstandard synonym for this flag."
3167 #: build/C/man2/sigaction.2:228
3169 msgid "B<SA_RESTART>"
3173 #: build/C/man2/sigaction.2:236
3175 "Provide behavior compatible with BSD signal semantics by making certain "
3176 "system calls restartable across signals. This flag is only meaningful when "
3177 "establishing a signal handler. See B<signal>(7) for a discussion of system "
3182 #: build/C/man2/sigaction.2:236
3184 msgid "B<SA_SIGINFO> (since Linux 2.2)"
3189 #. field was added in Linux 2.1.86.)
3191 #: build/C/man2/sigaction.2:247
3193 "The signal handler takes 3 arguments, not one. In this case, "
3194 "I<sa_sigaction> should be set instead of I<sa_handler>. This flag is only "
3195 "meaningful when establishing a signal handler."
3199 #: build/C/man2/sigaction.2:254
3201 "The I<siginfo_t> argument to I<sa_sigaction> is a struct with the following "
3206 #. si_trapno seems to be only used on SPARC and Alpha;
3207 #. this page could use a little more detail on its purpose there.
3208 #. In the kernel: si_tid
3210 #: build/C/man2/sigaction.2:285
3214 " int si_signo; /* Signal number */\n"
3215 " int si_errno; /* An errno value */\n"
3216 " int si_code; /* Signal code */\n"
3217 " int si_trapno; /* Trap number that caused\n"
3218 " hardware-generated signal\n"
3219 " (unused on most architectures) */\n"
3220 " pid_t si_pid; /* Sending process ID */\n"
3221 " uid_t si_uid; /* Real user ID of sending process */\n"
3222 " int si_status; /* Exit value or signal */\n"
3223 " clock_t si_utime; /* User time consumed */\n"
3224 " clock_t si_stime; /* System time consumed */\n"
3225 " sigval_t si_value; /* Signal value */\n"
3226 " int si_int; /* POSIX.1b signal */\n"
3227 " void *si_ptr; /* POSIX.1b signal */\n"
3228 " int si_overrun; /* Timer overrun count; POSIX.1b timers */\n"
3229 " int si_timerid; /* Timer ID; POSIX.1b timers */\n"
3230 " void *si_addr; /* Memory location which caused fault */\n"
3231 " long si_band; /* Band event (was I<int> in\n"
3232 " glibc 2.3.2 and earlier) */\n"
3233 " int si_fd; /* File descriptor */\n"
3234 " short si_addr_lsb; /* Least significant bit of address\n"
3235 " (since kernel 2.6.32) */\n"
3240 #: build/C/man2/sigaction.2:294
3242 "I<si_signo>, I<si_errno> and I<si_code> are defined for all signals. "
3243 "(I<si_errno> is generally unused on Linux.) The rest of the struct may be a "
3244 "union, so that one should only read the fields that are meaningful for the "
3249 #: build/C/man2/sigaction.2:309
3251 "Signals sent with B<kill>(2) and B<sigqueue>(3) fill in I<si_pid> and "
3252 "I<si_uid>. In addition, signals sent with B<sigqueue>(3) fill in I<si_int> "
3253 "and I<si_ptr> with the values specified by the sender of the signal; see "
3254 "B<sigqueue>(3) for more details."
3258 #: build/C/man2/sigaction.2:325
3260 "Signals sent by POSIX.1b timers (since Linux 2.6) fill in I<si_overrun> and "
3261 "I<si_timerid>. The I<si_timerid> field is an internal ID used by the kernel "
3262 "to identify the timer; it is not the same as the timer ID returned by "
3263 "B<timer_create>(2). The I<si_overrun> field is the timer overrun count; "
3264 "this is the same information as is obtained by a call to "
3265 "B<timer_getoverrun>(2). These fields are nonstandard Linux extensions."
3269 #: build/C/man2/sigaction.2:340
3271 "Signals sent for message queue notification (see the description of "
3272 "B<SIGEV_SIGNAL> in B<mq_notify>(3)) fill in I<si_int>/I<si_ptr>, with the "
3273 "I<sigev_value> supplied to B<mq_notify>(3); I<si_pid>, with the process ID "
3274 "of the message sender; and I<si_uid>, with the real user ID of the message "
3279 #. When si_utime and si_stime where originally implemented, the
3280 #. measurement unit was HZ, which was the same as clock ticks
3281 #. (sysconf(_SC_CLK_TCK)). In 2.6, HZ became configurable, and
3282 #. was *still* used as the unit to return the info these fields,
3283 #. with the result that the field values depended on the the
3284 #. configured HZ. Of course, the should have been measured in
3285 #. USER_HZ instead, so that sysconf(_SC_CLK_TCK) could be used to
3286 #. convert to seconds. I have a queued patch to fix this:
3287 #. http://thread.gmane.org/gmane.linux.kernel/698061/ .
3288 #. This patch made it into 2.6.27.
3289 #. But note that these fields still don't return the times of
3290 #. waited-for children (as is done by getrusage() and times()
3291 #. and wait4()). Solaris 8 does include child times.
3293 #: build/C/man2/sigaction.2:387
3295 "B<SIGCHLD> fills in I<si_pid>, I<si_uid>, I<si_status>, I<si_utime> and "
3296 "I<si_stime>, providing information about the child. The I<si_pid> field is "
3297 "the process ID of the child; I<si_uid> is the child's real user ID. The "
3298 "I<si_status> field contains the exit status of the child (if I<si_code> is "
3299 "B<CLD_EXITED>), or the signal number that caused the process to change "
3300 "state. The I<si_utime> and I<si_stime> contain the user and system CPU time "
3301 "used by the child process; these fields do not include the times used by "
3302 "waited-for children (unlike B<getrusage>(2) and B<time>(2)). In kernels up "
3303 "to 2.6, and since 2.6.27, these fields report CPU time in units of "
3304 "I<sysconf(_SC_CLK_TCK)>. In 2.6 kernels before 2.6.27, a bug meant that "
3305 "these fields reported time in units of the (configurable) system jiffy (see "
3309 #. FIXME SIGTRAP also sets the following for ptrace_notify() ?
3310 #. info.si_code = exit_code;
3311 #. info.si_pid = task_pid_vnr(current);
3312 #. info.si_uid = current_uid(); /* Real UID */
3314 #: build/C/man2/sigaction.2:423
3316 "B<SIGILL>, B<SIGFPE>, B<SIGSEGV>, B<SIGBUS>, and B<SIGTRAP> fill in "
3317 "I<si_addr> with the address of the fault. On some architectures, these "
3318 "signals also fill in the I<si_trapno> filed. Some suberrors of B<SIGBUS>, "
3319 "in particular B<BUS_MCEERR_AO> and B<BUS_MCEERR_AR>, also fill in "
3320 "I<si_addr_lsb>. This field indicates the least significant bit of the "
3321 "reported address and therefore the extent of the corruption. For example, "
3322 "if a full page was corrupted, I<si_addr_lsb> contains "
3323 "I<log2(sysconf(_SC_PAGESIZE))>. B<BUS_MCERR_*> and I<si_addr_lsb> are "
3324 "Linux-specific extensions."
3328 #: build/C/man2/sigaction.2:437
3330 "B<SIGIO>/B<SIGPOLL> (the two names are synonyms on Linux) fills in "
3331 "I<si_band> and I<si_fd>. The I<si_band> event is a bit mask containing the "
3332 "same values as are filled in the I<revents> field by B<poll>(2). The "
3333 "I<si_fd> field indicates the file descriptor for which the I/O event "
3338 #: build/C/man2/sigaction.2:444
3340 "I<si_code> is a value (not a bit mask) indicating why this signal was "
3341 "sent. The following list shows the values which can be placed in I<si_code> "
3342 "for any signal, along with reason that the signal was generated."
3346 #: build/C/man2/sigaction.2:445
3352 #: build/C/man2/sigaction.2:448 build/C/man7/signal.7:109
3358 #: build/C/man2/sigaction.2:448
3360 msgid "B<SI_KERNEL>"
3364 #: build/C/man2/sigaction.2:451
3365 msgid "Sent by the kernel."
3369 #: build/C/man2/sigaction.2:451
3375 #: build/C/man2/sigaction.2:454 build/C/man7/signal.7:126
3377 msgid "B<sigqueue>(3)"
3381 #: build/C/man2/sigaction.2:454
3387 #: build/C/man2/sigaction.2:457
3388 msgid "POSIX timer expired"
3392 #: build/C/man2/sigaction.2:457
3398 #: build/C/man2/sigaction.2:461
3399 msgid "POSIX message queue state changed (since Linux 2.6.6); see B<mq_notify>(3)"
3403 #: build/C/man2/sigaction.2:461
3405 msgid "B<SI_ASYNCIO>"
3409 #: build/C/man2/sigaction.2:464
3410 msgid "AIO completed"
3414 #: build/C/man2/sigaction.2:464
3420 #: build/C/man2/sigaction.2:473
3422 "Queued B<SIGIO> (only in kernels up to Linux 2.2; from Linux 2.4 onward "
3423 "B<SIGIO>/B<SIGPOLL> fills in I<si_code> as described below)."
3427 #: build/C/man2/sigaction.2:473
3432 #. SI_DETHREAD is defined in 2.6.9 sources, but isn't implemented
3433 #. It appears to have been an idea that was tried during 2.5.6
3434 #. through to 2.5.24 and then was backed out.
3436 #: build/C/man2/sigaction.2:482
3437 msgid "B<tkill>(2) or B<tgkill>(2) (since Linux 2.4.19)"
3441 #: build/C/man2/sigaction.2:489
3442 msgid "The following values can be placed in I<si_code> for a B<SIGILL> signal:"
3446 #: build/C/man2/sigaction.2:490
3448 msgid "B<ILL_ILLOPC>"
3452 #: build/C/man2/sigaction.2:493
3453 msgid "illegal opcode"
3457 #: build/C/man2/sigaction.2:493
3459 msgid "B<ILL_ILLOPN>"
3463 #: build/C/man2/sigaction.2:496
3464 msgid "illegal operand"
3468 #: build/C/man2/sigaction.2:496
3470 msgid "B<ILL_ILLADR>"
3474 #: build/C/man2/sigaction.2:499
3475 msgid "illegal addressing mode"
3479 #: build/C/man2/sigaction.2:499
3481 msgid "B<ILL_ILLTRP>"
3485 #: build/C/man2/sigaction.2:502
3486 msgid "illegal trap"
3490 #: build/C/man2/sigaction.2:502
3492 msgid "B<ILL_PRVOPC>"
3496 #: build/C/man2/sigaction.2:505
3497 msgid "privileged opcode"
3501 #: build/C/man2/sigaction.2:505
3503 msgid "B<ILL_PRVREG>"
3507 #: build/C/man2/sigaction.2:508
3508 msgid "privileged register"
3512 #: build/C/man2/sigaction.2:508
3514 msgid "B<ILL_COPROC>"
3518 #: build/C/man2/sigaction.2:511
3519 msgid "coprocessor error"
3523 #: build/C/man2/sigaction.2:511
3525 msgid "B<ILL_BADSTK>"
3529 #: build/C/man2/sigaction.2:514
3530 msgid "internal stack error"
3534 #: build/C/man2/sigaction.2:521
3535 msgid "The following values can be placed in I<si_code> for a B<SIGFPE> signal:"
3539 #: build/C/man2/sigaction.2:522
3541 msgid "B<FPE_INTDIV>"
3545 #: build/C/man2/sigaction.2:525
3546 msgid "integer divide by zero"
3550 #: build/C/man2/sigaction.2:525
3552 msgid "B<FPE_INTOVF>"
3556 #: build/C/man2/sigaction.2:528
3557 msgid "integer overflow"
3561 #: build/C/man2/sigaction.2:528
3563 msgid "B<FPE_FLTDIV>"
3567 #: build/C/man2/sigaction.2:531
3568 msgid "floating-point divide by zero"
3572 #: build/C/man2/sigaction.2:531
3574 msgid "B<FPE_FLTOVF>"
3578 #: build/C/man2/sigaction.2:534
3579 msgid "floating-point overflow"
3583 #: build/C/man2/sigaction.2:534
3585 msgid "B<FPE_FLTUND>"
3589 #: build/C/man2/sigaction.2:537
3590 msgid "floating-point underflow"
3594 #: build/C/man2/sigaction.2:537
3596 msgid "B<FPE_FLTRES>"
3600 #: build/C/man2/sigaction.2:540
3601 msgid "floating-point inexact result"
3605 #: build/C/man2/sigaction.2:540
3607 msgid "B<FPE_FLTINV>"
3611 #: build/C/man2/sigaction.2:543
3612 msgid "floating-point invalid operation"
3616 #: build/C/man2/sigaction.2:543
3618 msgid "B<FPE_FLTSUB>"
3622 #: build/C/man2/sigaction.2:546
3623 msgid "subscript out of range"
3627 #: build/C/man2/sigaction.2:553
3628 msgid "The following values can be placed in I<si_code> for a B<SIGSEGV> signal:"
3632 #: build/C/man2/sigaction.2:554
3634 msgid "B<SEGV_MAPERR>"
3638 #: build/C/man2/sigaction.2:557
3639 msgid "address not mapped to object"
3643 #: build/C/man2/sigaction.2:557
3645 msgid "B<SEGV_ACCERR>"
3649 #: build/C/man2/sigaction.2:560
3650 msgid "invalid permissions for mapped object"
3654 #: build/C/man2/sigaction.2:567
3655 msgid "The following values can be placed in I<si_code> for a B<SIGBUS> signal:"
3659 #: build/C/man2/sigaction.2:568
3661 msgid "B<BUS_ADRALN>"
3665 #: build/C/man2/sigaction.2:571
3666 msgid "invalid address alignment"
3670 #: build/C/man2/sigaction.2:571
3672 msgid "B<BUS_ADRERR>"
3676 #: build/C/man2/sigaction.2:574
3677 msgid "nonexistent physical address"
3681 #: build/C/man2/sigaction.2:574
3683 msgid "B<BUS_OBJERR>"
3687 #: build/C/man2/sigaction.2:577
3688 msgid "object-specific hardware error"
3692 #: build/C/man2/sigaction.2:577
3694 msgid "B<BUS_MCEERR_AR> (since Linux 2.6.32)"
3698 #: build/C/man2/sigaction.2:580
3699 msgid "Hardware memory error consumed on a machine check; action required."
3703 #: build/C/man2/sigaction.2:580
3705 msgid "B<BUS_MCEERR_AO> (since Linux 2.6.32)"
3709 #: build/C/man2/sigaction.2:583
3710 msgid "Hardware memory error detected in process but not consumed; action optional."
3714 #: build/C/man2/sigaction.2:590
3715 msgid "The following values can be placed in I<si_code> for a B<SIGTRAP> signal:"
3719 #: build/C/man2/sigaction.2:591
3721 msgid "B<TRAP_BRKPT>"
3725 #: build/C/man2/sigaction.2:594
3726 msgid "process breakpoint"
3730 #: build/C/man2/sigaction.2:594
3732 msgid "B<TRAP_TRACE>"
3736 #: build/C/man2/sigaction.2:597
3737 msgid "process trace trap"
3741 #: build/C/man2/sigaction.2:597
3743 msgid "B<TRAP_BRANCH> (since Linux 2.4)"
3747 #: build/C/man2/sigaction.2:600
3748 msgid "process taken branch trap"
3752 #: build/C/man2/sigaction.2:600
3754 msgid "B<TRAP_HWBKPT> (since Linux 2.4)"
3758 #: build/C/man2/sigaction.2:603
3759 msgid "hardware breakpoint/watchpoint"
3763 #: build/C/man2/sigaction.2:610
3764 msgid "The following values can be placed in I<si_code> for a B<SIGCHLD> signal:"
3768 #: build/C/man2/sigaction.2:611
3770 msgid "B<CLD_EXITED>"
3774 #: build/C/man2/sigaction.2:614
3775 msgid "child has exited"
3779 #: build/C/man2/sigaction.2:614
3781 msgid "B<CLD_KILLED>"
3785 #: build/C/man2/sigaction.2:617
3786 msgid "child was killed"
3790 #: build/C/man2/sigaction.2:617
3792 msgid "B<CLD_DUMPED>"
3796 #: build/C/man2/sigaction.2:620
3797 msgid "child terminated abnormally"
3801 #: build/C/man2/sigaction.2:620
3803 msgid "B<CLD_TRAPPED>"
3807 #: build/C/man2/sigaction.2:623
3808 msgid "traced child has trapped"
3812 #: build/C/man2/sigaction.2:623
3814 msgid "B<CLD_STOPPED>"
3818 #: build/C/man2/sigaction.2:626
3819 msgid "child has stopped"
3823 #: build/C/man2/sigaction.2:626
3825 msgid "B<CLD_CONTINUED>"
3829 #: build/C/man2/sigaction.2:629
3830 msgid "stopped child has continued (since Linux 2.6.9)"
3834 #: build/C/man2/sigaction.2:636
3836 "The following values can be placed in I<si_code> for a B<SIGIO>/B<SIGPOLL> "
3841 #: build/C/man2/sigaction.2:637
3847 #: build/C/man2/sigaction.2:640
3848 msgid "data input available"
3852 #: build/C/man2/sigaction.2:640
3858 #: build/C/man2/sigaction.2:643
3859 msgid "output buffers available"
3863 #: build/C/man2/sigaction.2:643
3869 #: build/C/man2/sigaction.2:646
3870 msgid "input message available"
3874 #: build/C/man2/sigaction.2:646
3880 #: build/C/man2/sigaction.2:649
3885 #: build/C/man2/sigaction.2:649
3891 #: build/C/man2/sigaction.2:652
3892 msgid "high priority input available"
3896 #: build/C/man2/sigaction.2:652
3902 #: build/C/man2/sigaction.2:655
3903 msgid "device disconnected"
3907 #: build/C/man2/sigaction.2:659
3908 msgid "B<sigaction>() returns 0 on success and -1 on error."
3912 #: build/C/man2/sigaction.2:664
3914 "I<act> or I<oldact> points to memory which is not a valid part of the "
3915 "process address space."
3919 #: build/C/man2/sigaction.2:671
3921 "An invalid signal was specified. This will also be generated if an attempt "
3922 "is made to change the action for B<SIGKILL> or B<SIGSTOP>, which cannot be "
3923 "caught or ignored."
3926 #. SVr4 does not document the EINTR condition.
3928 #: build/C/man2/sigaction.2:674
3929 msgid "POSIX.1-2001, SVr4."
3933 #: build/C/man2/sigaction.2:682 build/C/man7/signal.7:103
3935 "A child created via B<fork>(2) inherits a copy of its parent's signal "
3936 "dispositions. During an B<execve>(2), the dispositions of handled signals "
3937 "are reset to the default; the dispositions of ignored signals are left "
3942 #: build/C/man2/sigaction.2:700 build/C/man2/signal.2:129
3944 "According to POSIX, the behavior of a process is undefined after it ignores "
3945 "a B<SIGFPE>, B<SIGILL>, or B<SIGSEGV> signal that was not generated by "
3946 "B<kill>(2) or B<raise>(3). Integer division by zero has undefined result. "
3947 "On some architectures it will generate a B<SIGFPE> signal. (Also dividing "
3948 "the most negative integer by -1 may generate B<SIGFPE>.) Ignoring this "
3949 "signal might lead to an endless loop."
3953 #: build/C/man2/sigaction.2:717
3955 "POSIX.1-1990 disallowed setting the action for B<SIGCHLD> to B<SIG_IGN>. "
3956 "POSIX.1-2001 allows this possibility, so that ignoring B<SIGCHLD> can be "
3957 "used to prevent the creation of zombies (see B<wait>(2)). Nevertheless, the "
3958 "historical BSD and System V behaviors for ignoring B<SIGCHLD> differ, so "
3959 "that the only completely portable method of ensuring that terminated "
3960 "children do not become zombies is to catch the B<SIGCHLD> signal and perform "
3961 "a B<wait>(2) or similar."
3965 #: build/C/man2/sigaction.2:730
3967 "POSIX.1-1990 only specified B<SA_NOCLDSTOP>. POSIX.1-2001 added "
3968 "B<SA_NOCLDWAIT>, B<SA_RESETHAND>, B<SA_NODEFER>, and B<SA_SIGINFO>. Use of "
3969 "these latter values in I<sa_flags> may be less portable in applications "
3970 "intended for older UNIX implementations."
3974 #: build/C/man2/sigaction.2:734
3975 msgid "The B<SA_RESETHAND> flag is compatible with the SVr4 flag of the same name."
3979 #: build/C/man2/sigaction.2:744
3981 "The B<SA_NODEFER> flag is compatible with the SVr4 flag of the same name "
3982 "under kernels 1.3.9 and newer. On older kernels the Linux implementation "
3983 "allowed the receipt of any signal, not just the one we are installing "
3984 "(effectively overriding any I<sa_mask> settings)."
3988 #: build/C/man2/sigaction.2:750
3990 "B<sigaction>() can be called with a NULL second argument to query the "
3991 "current signal handler. It can also be used to check whether a given signal "
3992 "is valid for the current machine by calling it with NULL second and third "
3997 #: build/C/man2/sigaction.2:756
3999 "It is not possible to block B<SIGKILL> or B<SIGSTOP> (by specifying them in "
4000 "I<sa_mask>). Attempts to do so are silently ignored."
4004 #: build/C/man2/sigaction.2:760 build/C/man2/sigpending.2:65 build/C/man2/sigprocmask.2:139 build/C/man2/sigsuspend.2:104
4005 msgid "See B<sigsetops>(3) for details on manipulating signal sets."
4009 #: build/C/man2/sigaction.2:765
4011 "See B<signal>(7) for a list of the async-signal-safe functions that can be "
4012 "safely called inside from inside a signal handler."
4016 #: build/C/man2/sigaction.2:765
4018 msgid "Undocumented"
4022 #: build/C/man2/sigaction.2:775
4024 "Before the introduction of B<SA_SIGINFO> it was also possible to get some "
4025 "additional information, namely by using a I<sa_handler> with second argument "
4026 "of type I<struct sigcontext>. See the relevant kernel sources for details. "
4027 "This use is obsolete now."
4031 #: build/C/man2/sigaction.2:784
4033 "In kernels up to and including 2.6.13, specifying B<SA_NODEFER> in "
4034 "I<sa_flags> prevents not only the delivered signal from being masked during "
4035 "execution of the handler, but also the signals specified in I<sa_mask>. "
4036 "This bug was fixed in kernel 2.6.14."
4040 #: build/C/man2/sigaction.2:787
4041 msgid "See B<mprotect>(2)."
4045 #: build/C/man2/sigaction.2:806
4047 "B<kill>(1), B<kill>(2), B<killpg>(2), B<pause>(2), B<sigaltstack>(2), "
4048 "B<signal>(2), B<signalfd>(2), B<sigpending>(2), B<sigprocmask>(2), "
4049 "B<sigsuspend>(2), B<wait>(2), B<raise>(3), B<siginterrupt>(3), "
4050 "B<sigqueue>(3), B<sigsetops>(3), B<sigvec>(3), B<core>(5), B<signal>(7)"
4054 #: build/C/man2/sigaltstack.2:25
4060 #: build/C/man2/sigaltstack.2:25 build/C/man2/wait.2:50
4066 #: build/C/man2/sigaltstack.2:28
4067 msgid "sigaltstack - set and/or get signal stack context"
4071 #: build/C/man2/sigaltstack.2:32
4072 msgid "B<int sigaltstack(const stack_t *>I<ss>B<, stack_t *>I<oss>B<);>"
4076 #: build/C/man2/sigaltstack.2:39
4077 msgid "B<sigaltstack>():"
4081 #: build/C/man2/sigaltstack.2:46 build/C/man3/siginterrupt.3:51 build/C/man2/wait.2:79
4082 msgid "|| /* Since glibc 2.12: */ _POSIX_C_SOURCE\\ E<gt>=\\ 200809L"
4086 #: build/C/man2/sigaltstack.2:58
4088 "B<sigaltstack>() allows a process to define a new alternate signal stack "
4089 "and/or retrieve the state of an existing alternate signal stack. An "
4090 "alternate signal stack is used during the execution of a signal handler if "
4091 "the establishment of that handler (see B<sigaction>(2)) requested it."
4095 #: build/C/man2/sigaltstack.2:61
4097 "The normal sequence of events for using an alternate signal stack is the "
4102 #: build/C/man2/sigaltstack.2:61 build/C/man7/signal.7:385
4108 #: build/C/man2/sigaltstack.2:65
4109 msgid "Allocate an area of memory to be used for the alternate signal stack."
4113 #: build/C/man2/sigaltstack.2:65 build/C/man7/signal.7:389
4119 #: build/C/man2/sigaltstack.2:71
4121 "Use B<sigaltstack>() to inform the system of the existence and location of "
4122 "the alternate signal stack."
4126 #: build/C/man2/sigaltstack.2:71 build/C/man7/signal.7:409
4132 #: build/C/man2/sigaltstack.2:78
4134 "When establishing a signal handler using B<sigaction>(2), inform the system "
4135 "that the signal handler should be executed on the alternate signal stack by "
4136 "specifying the B<SA_ONSTACK> flag."
4140 #: build/C/man2/sigaltstack.2:86
4142 "The I<ss> argument is used to specify a new alternate signal stack, while "
4143 "the I<oss> argument is used to retrieve information about the currently "
4144 "established signal stack. If we are interested in performing just one of "
4145 "these tasks then the other argument can be specified as NULL. Each of these "
4146 "arguments is a structure of the following type:"
4150 #: build/C/man2/sigaltstack.2:94
4153 "typedef struct {\n"
4154 " void *ss_sp; /* Base address of stack */\n"
4155 " int ss_flags; /* Flags */\n"
4156 " size_t ss_size; /* Number of bytes in stack */\n"
4161 #: build/C/man2/sigaltstack.2:105
4163 "To establish a new alternate signal stack, I<ss.ss_flags> is set to zero, "
4164 "and I<ss.ss_sp> and I<ss.ss_size> specify the starting address and size of "
4165 "the stack. The constant B<SIGSTKSZ> is defined to be large enough to cover "
4166 "the usual size requirements for an alternate signal stack, and the constant "
4167 "B<MINSIGSTKSZ> defines the minimum size required to execute a signal "
4172 #: build/C/man2/sigaltstack.2:109
4174 "When a signal handler is invoked on the alternate stack, the kernel "
4175 "automatically aligns the address given in I<ss.ss_sp> to a suitable address "
4176 "boundary for the underlying hardware architecture."
4180 #: build/C/man2/sigaltstack.2:114
4182 "To disable an existing stack, specify I<ss.ss_flags> as B<SS_DISABLE>. In "
4183 "this case, the remaining fields in I<ss> are ignored."
4187 #: build/C/man2/sigaltstack.2:122
4189 "If I<oss> is not NULL, then it is used to return information about the "
4190 "alternate signal stack which was in effect prior to the call to "
4191 "B<sigaltstack>(). The I<oss.ss_sp> and I<oss.ss_size> fields return the "
4192 "starting address and size of that stack. The I<oss.ss_flags> may return "
4193 "either of the following values:"
4197 #: build/C/man2/sigaltstack.2:122
4199 msgid "B<SS_ONSTACK>"
4203 #: build/C/man2/sigaltstack.2:128
4205 "The process is currently executing on the alternate signal stack. (Note "
4206 "that it is not possible to change the alternate signal stack if the process "
4207 "is currently executing on it.)"
4211 #: build/C/man2/sigaltstack.2:128
4213 msgid "B<SS_DISABLE>"
4217 #: build/C/man2/sigaltstack.2:131
4218 msgid "The alternate signal stack is currently disabled."
4222 #: build/C/man2/sigaltstack.2:135
4224 "B<sigaltstack>() returns 0 on success, or -1 on failure with I<errno> set "
4225 "to indicate the error."
4229 #: build/C/man2/sigaltstack.2:140
4231 "Either I<ss> or I<oss> is not NULL and points to an area outside of the "
4232 "process's address space."
4236 #: build/C/man2/sigaltstack.2:145
4238 "I<ss> is not NULL and the I<ss_flags> field contains a nonzero value other "
4239 "than B<SS_DISABLE>."
4243 #: build/C/man2/sigaltstack.2:149
4245 "The specified size of the new alternate signal stack (I<ss.ss_size>) was "
4246 "less than B<MINSTKSZ>."
4250 #: build/C/man2/sigaltstack.2:154
4252 "An attempt was made to change the alternate signal stack while it was active "
4253 "(i.e., the process was already executing on the current alternate signal "
4258 #: build/C/man2/sigaltstack.2:156
4259 msgid "SUSv2, SVr4, POSIX.1-2001."
4263 #: build/C/man2/sigaltstack.2:164
4265 "The most common usage of an alternate signal stack is to handle the "
4266 "B<SIGSEGV> signal that is generated if the space available for the normal "
4267 "process stack is exhausted: in this case, a signal handler for B<SIGSEGV> "
4268 "cannot be invoked on the process stack; if we wish to handle it, we must use "
4269 "an alternate signal stack."
4273 #: build/C/man2/sigaltstack.2:174
4275 "Establishing an alternate signal stack is useful if a process expects that "
4276 "it may exhaust its standard stack. This may occur, for example, because the "
4277 "stack grows so large that it encounters the upwardly growing heap, or it "
4278 "reaches a limit established by a call to B<setrlimit(RLIMIT_STACK, &rlim)>. "
4279 "If the standard stack is exhausted, the kernel sends the process a "
4280 "B<SIGSEGV> signal. In these circumstances the only way to catch this signal "
4281 "is on an alternate signal stack."
4285 #: build/C/man2/sigaltstack.2:180
4287 "On most hardware architectures supported by Linux, stacks grow downward. "
4288 "B<sigaltstack>() automatically takes account of the direction of stack "
4293 #: build/C/man2/sigaltstack.2:189
4295 "Functions called from a signal handler executing on an alternate signal "
4296 "stack will also use the alternate signal stack. (This also applies to any "
4297 "handlers invoked for other signals while the process is executing on the "
4298 "alternate signal stack.) Unlike the standard stack, the system does not "
4299 "automatically extend the alternate signal stack. Exceeding the allocated "
4300 "size of the alternate signal stack will lead to unpredictable results."
4304 #: build/C/man2/sigaltstack.2:197
4306 "A successful call to B<execve>(2) removes any existing alternate signal "
4307 "stack. A child process created via B<fork>(2) inherits a copy of its "
4308 "parent's alternate signal stack settings."
4312 #: build/C/man2/sigaltstack.2:206
4314 "B<sigaltstack>() supersedes the older B<sigstack>() call. For backward "
4315 "compatibility, glibc also provides B<sigstack>(). All new applications "
4316 "should be written using B<sigaltstack>()."
4320 #: build/C/man2/sigaltstack.2:206 build/C/man3/sigpause.3:59
4326 #: build/C/man2/sigaltstack.2:213
4328 "4.2BSD had a B<sigstack>() system call. It used a slightly different "
4329 "struct, and had the major disadvantage that the caller had to know the "
4330 "direction of stack growth."
4334 #: build/C/man2/sigaltstack.2:216
4335 msgid "The following code segment demonstrates the use of B<sigaltstack>():"
4339 #: build/C/man2/sigaltstack.2:220
4341 msgid "stack_t ss;\n"
4345 #: build/C/man2/sigaltstack.2:228
4348 "ss.ss_sp = malloc(SIGSTKSZ);\n"
4349 "if (ss.ss_sp == NULL)\n"
4350 " /* Handle error */;\n"
4351 "ss.ss_size = SIGSTKSZ;\n"
4352 "ss.ss_flags = 0;\n"
4353 "if (sigaltstack(&ss, NULL) == -1)\n"
4354 " /* Handle error */;\n"
4358 #: build/C/man2/sigaltstack.2:237
4360 "B<execve>(2), B<setrlimit>(2), B<sigaction>(2), B<siglongjmp>(3), "
4361 "B<sigsetjmp>(3), B<signal>(7)"
4365 #: build/C/man7/sigevent.7:24
4371 #: build/C/man7/sigevent.7:24 build/C/man3/siginterrupt.3:29
4377 #: build/C/man7/sigevent.7:27
4378 msgid "sigevent - structure for notification from asynchronous routines"
4382 #: build/C/man7/sigevent.7:34
4385 "union sigval { /* Data passed with notification */\n"
4386 " int sival_int; /* Integer value */\n"
4387 " void *sival_ptr; /* Pointer value */\n"
4392 #: build/C/man7/sigevent.7:49
4395 "struct sigevent {\n"
4396 " int sigev_notify; /* Notification method */\n"
4397 " int sigev_signo; /* Notification signal */\n"
4398 " union sigval sigev_value; /* Data passed with\n"
4399 " notification */\n"
4400 " void (*sigev_notify_function) (union sigval);\n"
4401 " /* Function used for thread\n"
4402 " notification (SIGEV_THREAD) */\n"
4403 " void *sigev_notify_attributes;\n"
4404 " /* Attributes for notification thread\n"
4405 " (SIGEV_THREAD) */\n"
4406 " pid_t sigev_notify_thread_id;\n"
4407 " /* ID of thread to signal (SIGEV_THREAD_ID) */\n"
4412 #: build/C/man7/sigevent.7:58
4414 "The I<sigevent> structure is used by various APIs to describe the way a "
4415 "process is to be notified about an event (e.g., completion of an "
4416 "asynchronous request, expiration of a timer, or the arrival of a message)."
4420 #: build/C/man7/sigevent.7:66
4422 "The definition shown in the SYNOPSIS is approximate: some of the fields in "
4423 "the I<sigevent> structure may be defined as part of a union. Programs "
4424 "should only employ those fields relevant to the value specified in "
4429 #: build/C/man7/sigevent.7:71
4431 "The I<sigev_notify> field specifies how notification is to be performed. "
4432 "This field can have one of the following values:"
4436 #: build/C/man7/sigevent.7:71 build/C/man2/timer_create.2:105
4438 msgid "B<SIGEV_NONE>"
4442 #: build/C/man7/sigevent.7:74
4443 msgid "A \"null\" notification: don't do anything when the event occurs."
4447 #: build/C/man7/sigevent.7:74 build/C/man2/timer_create.2:110
4449 msgid "B<SIGEV_SIGNAL>"
4453 #: build/C/man7/sigevent.7:78
4454 msgid "Notify the process by sending the signal specified in I<sigev_signo>."
4458 #: build/C/man7/sigevent.7:85
4460 "If the signal is caught with a signal handler that was registered using the "
4461 "B<sigaction>(2) B<SA_SIGINFO> flag, then the following fields are set in "
4462 "the I<siginfo_t> structure that is passed as the second argument of the "
4467 #: build/C/man7/sigevent.7:90
4469 "This field is set to a value that depends on the API delivering the "
4474 #: build/C/man7/sigevent.7:90 build/C/man2/wait.2:301
4480 #: build/C/man7/sigevent.7:94
4482 "This field is set to the signal number (i.e., the same value as in "
4487 #: build/C/man7/sigevent.7:98
4488 msgid "This field is set to the value specified in I<sigev_value>."
4492 #: build/C/man7/sigevent.7:103
4494 "Depending on the API, other fields may also be set in the I<siginfo_t> "
4499 #: build/C/man7/sigevent.7:106
4501 "The same information is also available if the signal is accepted using "
4502 "B<sigwaitinfo>(2)."
4506 #: build/C/man7/sigevent.7:106 build/C/man2/timer_create.2:128
4508 msgid "B<SIGEV_THREAD>"
4512 #: build/C/man7/sigevent.7:123
4514 "Notify the process by invoking I<sigev_notify_function> \"as if\" it were "
4515 "the start function of a new thread. (Among the implementation possibilities "
4516 "here are that each timer notification could result in the creation of a new "
4517 "thread, or that a single thread is created to receive all notifications.) "
4518 "The function is invoked with I<sigev_value> as its sole argument. If "
4519 "I<sigev_notify_attributes> is not NULL, it should point to a "
4520 "I<pthread_attr_t> structure that defines attributes for the new thread (see "
4521 "B<pthread_attr_init>(3))."
4525 #: build/C/man7/sigevent.7:123 build/C/man2/timer_create.2:136
4527 msgid "B<SIGEV_THREAD_ID> (Linux-specific)"
4530 #. | SIGEV_SIGNAL vs not?
4532 #: build/C/man7/sigevent.7:128
4533 msgid "Currently used only by POSIX timers; see B<timer_create>(2)."
4537 #: build/C/man7/sigevent.7:130 build/C/man2/sigpending.2:61 build/C/man2/sigprocmask.2:109 build/C/man3/sigqueue.3:114 build/C/man3/sigsetops.3:128 build/C/man2/sigsuspend.2:82 build/C/man3/sigwait.3:79 build/C/man2/sigwaitinfo.2:131 build/C/man2/timer_create.2:193 build/C/man2/timer_delete.2:66 build/C/man2/timer_getoverrun.2:96 build/C/man2/timer_settime.2:205
4538 msgid "POSIX.1-2001."
4542 #: build/C/man7/sigevent.7:140
4544 "B<timer_create>(2), B<aio_fsync>(3), B<aio_read>(3), B<aio_write>(3), "
4545 "B<getaddrinfo_a>(3), B<lio_listio>(3), B<mq_notify>(3), B<aio>(7), "
4550 #: build/C/man3/siginterrupt.3:29
4552 msgid "SIGINTERRUPT"
4556 #: build/C/man3/siginterrupt.3:32
4557 msgid "siginterrupt - allow signals to interrupt system calls"
4561 #: build/C/man3/siginterrupt.3:37
4563 msgid "B<int siginterrupt(int >I<sig>B<, int >I<flag>B<);>\n"
4567 #: build/C/man3/siginterrupt.3:45
4568 msgid "B<siginterrupt>():"
4572 #: build/C/man3/siginterrupt.3:62
4574 "The B<siginterrupt>() function changes the restart behavior when a system "
4575 "call is interrupted by the signal I<sig>. If the I<flag> argument is false "
4576 "(0), then system calls will be restarted if interrupted by the specified "
4577 "signal I<sig>. This is the default behavior in Linux."
4581 #: build/C/man3/siginterrupt.3:67
4583 "If the I<flag> argument is true (1) and no data has been transferred, then a "
4584 "system call interrupted by the signal I<sig> will return -1 and I<errno> "
4585 "will be set to B<EINTR>."
4589 #: build/C/man3/siginterrupt.3:71
4591 "If the I<flag> argument is true (1) and data transfer has started, then the "
4592 "system call will be interrupted and will return the actual amount of data "
4597 #: build/C/man3/siginterrupt.3:76
4599 "The B<siginterrupt>() function returns 0 on success, or -1 if the signal "
4600 "number I<sig> is invalid."
4604 #: build/C/man3/siginterrupt.3:80
4605 msgid "The specified signal number is invalid."
4609 #: build/C/man3/siginterrupt.3:89
4611 "4.3BSD, POSIX.1-2001. POSIX.1-2008 marks B<siginterrupt>() as obsolete, "
4612 "recommending the use of B<sigaction>(2) with the B<SA_RESTART> flag "
4617 #: build/C/man3/siginterrupt.3:91
4618 msgid "B<signal>(2)"
4622 #: build/C/man2/signal.2:34 build/C/man7/signal.7:44
4628 #: build/C/man2/signal.2:34
4634 #: build/C/man2/signal.2:37
4635 msgid "signal - ANSI C signal handling"
4639 #: build/C/man2/signal.2:43
4640 msgid "B<sighandler_t signal(int >I<signum>B<, sighandler_t >I<handler>B<);>"
4644 #: build/C/man2/signal.2:52
4646 "The behavior of B<signal>() varies across UNIX versions, and has also "
4647 "varied historically across different versions of Linux. B<Avoid its use>: "
4648 "use B<sigaction>(2) instead. See I<Portability> below."
4652 #: build/C/man2/signal.2:62
4654 "B<signal>() sets the disposition of the signal I<signum> to I<handler>, "
4655 "which is either B<SIG_IGN>, B<SIG_DFL>, or the address of a "
4656 "programmer-defined function (a \"signal handler\")."
4660 #: build/C/man2/signal.2:66
4662 "If the signal I<signum> is delivered to the process, then one of the "
4663 "following happens:"
4667 #: build/C/man2/signal.2:71
4668 msgid "If the disposition is set to B<SIG_IGN>, then the signal is ignored."
4672 #: build/C/man2/signal.2:78
4674 "If the disposition is set to B<SIG_DFL>, then the default action associated "
4675 "with the signal (see B<signal>(7)) occurs."
4679 #: build/C/man2/signal.2:89
4681 "If the disposition is set to a function, then first either the disposition "
4682 "is reset to B<SIG_DFL>, or the signal is blocked (see I<Portability> below), "
4683 "and then I<handler> is called with argument I<signum>. If invocation of the "
4684 "handler caused the signal to be blocked, then the signal is unblocked upon "
4685 "return from the handler."
4689 #: build/C/man2/signal.2:95
4690 msgid "The signals B<SIGKILL> and B<SIGSTOP> cannot be caught or ignored."
4694 #: build/C/man2/signal.2:100
4696 "B<signal>() returns the previous value of the signal handler, or B<SIG_ERR> "
4701 #: build/C/man2/signal.2:105
4702 msgid "I<signum> is invalid."
4706 #: build/C/man2/signal.2:111
4707 msgid "The effects of B<signal>() in a multithreaded process are unspecified."
4711 #: build/C/man2/signal.2:136
4713 "See B<sigaction>(2) for details on what happens when B<SIGCHLD> is set to "
4718 #: build/C/man2/signal.2:141
4720 "See B<signal>(7) for a list of the async-signal-safe functions that can be "
4721 "safely called from inside a signal handler."
4724 #. libc4 and libc5 define
4725 #. .IR SignalHandler ;
4727 #: build/C/man2/signal.2:157
4729 "The use of I<sighandler_t> is a GNU extension, exposed if B<_GNU_SOURCE> is "
4730 "defined; glibc also defines (the BSD-derived) I<sig_t> if B<_BSD_SOURCE> is "
4731 "defined. Without use of such a type, the declaration of B<signal>() is the "
4732 "somewhat harder to read:"
4736 #: build/C/man2/signal.2:161
4739 "B<void ( *>I<signal>B<(int >I<signum>B<, void (*>I<handler>B<)(int)) ) "
4744 #: build/C/man2/signal.2:163
4750 #: build/C/man2/signal.2:175
4752 "The only portable use of B<signal>() is to set a signal's disposition to "
4753 "B<SIG_DFL> or B<SIG_IGN>. The semantics when using B<signal>() to "
4754 "establish a signal handler vary across systems (and POSIX.1 explicitly "
4755 "permits this variation); B<do not use it for this purpose.>"
4759 #: build/C/man2/signal.2:181
4761 "POSIX.1 solved the portability mess by specifying B<sigaction>(2), which "
4762 "provides explicit control of the semantics when a signal handler is invoked; "
4763 "use that interface instead of B<signal>()."
4767 #: build/C/man2/signal.2:194
4769 "In the original UNIX systems, when a handler that was established using "
4770 "B<signal>() was invoked by the delivery of a signal, the disposition of the "
4771 "signal would be reset to B<SIG_DFL>, and the system did not block delivery "
4772 "of further instances of the signal. System V also provides these semantics "
4773 "for B<signal>(). This was bad because the signal might be delivered again "
4774 "before the handler had a chance to reestablish itself. Furthermore, rapid "
4775 "deliveries of the same signal could result in recursive invocations of the "
4780 #: build/C/man2/signal.2:204
4782 "BSD improved on this situation by changing the semantics of signal handling "
4783 "(but, unfortunately, silently changed the semantics when establishing a "
4784 "handler with B<signal>()). On BSD, when a signal handler is invoked, the "
4785 "signal disposition is not reset, and further instances of the signal are "
4786 "blocked from being delivered while the handler is executing."
4790 #: build/C/man2/signal.2:206
4791 msgid "The situation on Linux is as follows:"
4795 #: build/C/man2/signal.2:210
4796 msgid "The kernel's B<signal>() system call provides System V semantics."
4800 #: build/C/man2/signal.2:226
4802 "By default, in glibc 2 and later, the B<signal>() wrapper function does not "
4803 "invoke the kernel system call. Instead, it calls B<sigaction>(2) using "
4804 "flags that supply BSD semantics. This default behavior is provided as long "
4805 "as the B<_BSD_SOURCE> feature test macro is defined. By default, "
4806 "B<_BSD_SOURCE> is defined; it is also implicitly defined if one defines "
4807 "B<_GNU_SOURCE>, and can of course be explicitly defined."
4811 #. System V semantics are also provided if one uses the separate
4812 #. .BR sysv_signal (3)
4815 #: build/C/man2/signal.2:249
4817 "On glibc 2 and later, if the B<_BSD_SOURCE> feature test macro is not "
4818 "defined, then B<signal>() provides System V semantics. (The default "
4819 "implicit definition of B<_BSD_SOURCE> is not provided if one invokes "
4820 "B<gcc>(1) in one of its standard modes (I<-std=xxx> or I<-ansi>) or "
4821 "defines various other feature test macros such as B<_POSIX_SOURCE>, "
4822 "B<_XOPEN_SOURCE>, or B<_SVID_SOURCE>; see B<feature_test_macros>(7).)"
4826 #: build/C/man2/signal.2:260
4828 "The B<signal>() function in Linux libc4 and libc5 provide System V "
4829 "semantics. If one on a libc5 system includes I<E<lt>bsd/signal.hE<gt>> "
4830 "instead of I<E<lt>signal.hE<gt>>, then B<signal>() provides BSD semantics."
4834 #: build/C/man2/signal.2:279
4836 "B<kill>(1), B<alarm>(2), B<kill>(2), B<killpg>(2), B<pause>(2), "
4837 "B<sigaction>(2), B<signalfd>(2), B<sigpending>(2), B<sigprocmask>(2), "
4838 "B<sigsuspend>(2), B<bsd_signal>(3), B<raise>(3), B<siginterrupt>(3), "
4839 "B<sigqueue>(3), B<sigsetops>(3), B<sigvec>(3), B<sysv_signal>(3), "
4844 #: build/C/man7/signal.7:44
4850 #: build/C/man7/signal.7:47
4851 msgid "signal - overview of signals"
4855 #: build/C/man7/signal.7:50
4857 "Linux supports both POSIX reliable signals (hereinafter \"standard "
4858 "signals\") and POSIX real-time signals."
4862 #: build/C/man7/signal.7:50
4864 msgid "Signal Dispositions"
4868 #: build/C/man7/signal.7:55
4870 "Each signal has a current I<disposition>, which determines how the process "
4871 "behaves when it is delivered the signal."
4875 #: build/C/man7/signal.7:58
4877 "The entries in the \"Action\" column of the tables below specify the default "
4878 "disposition for each signal, as follows:"
4882 #: build/C/man7/signal.7:58
4888 #: build/C/man7/signal.7:60
4889 msgid "Default action is to terminate the process."
4893 #: build/C/man7/signal.7:60
4899 #: build/C/man7/signal.7:62
4900 msgid "Default action is to ignore the signal."
4904 #: build/C/man7/signal.7:62
4910 #: build/C/man7/signal.7:65
4911 msgid "Default action is to terminate the process and dump core (see B<core>(5))."
4915 #: build/C/man7/signal.7:65
4921 #: build/C/man7/signal.7:67
4922 msgid "Default action is to stop the process."
4926 #: build/C/man7/signal.7:67
4932 #: build/C/man7/signal.7:69
4933 msgid "Default action is to continue the process if it is currently stopped."
4937 #: build/C/man7/signal.7:91
4939 "A process can change the disposition of a signal using B<sigaction>(2) or "
4940 "B<signal>(2). (The latter is less portable when establishing a signal "
4941 "handler; see B<signal>(2) for details.) Using these system calls, a "
4942 "process can elect one of the following behaviors to occur on delivery of the "
4943 "signal: perform the default action; ignore the signal; or catch the signal "
4944 "with a I<signal handler>, a programmer-defined function that is "
4945 "automatically invoked when the signal is delivered. (By default, the signal "
4946 "handler is invoked on the normal process stack. It is possible to arrange "
4947 "that the signal handler uses an alternate stack; see B<sigaltstack>(2) for "
4948 "a discussion of how to do this and when it might be useful.)"
4952 #: build/C/man7/signal.7:95
4954 "The signal disposition is a per-process attribute: in a multithreaded "
4955 "application, the disposition of a particular signal is the same for all "
4960 #: build/C/man7/signal.7:103
4962 msgid "Sending a Signal"
4966 #: build/C/man7/signal.7:106
4968 "The following system calls and library functions allow the caller to send a "
4973 #: build/C/man7/signal.7:106
4979 #: build/C/man7/signal.7:109
4980 msgid "Sends a signal to the calling thread."
4984 #: build/C/man7/signal.7:114
4986 "Sends a signal to a specified process, to all members of a specified process "
4987 "group, or to all processes on the system."
4991 #: build/C/man7/signal.7:114
4993 msgid "B<killpg>(2)"
4997 #: build/C/man7/signal.7:117
4998 msgid "Sends a signal to all of the members of a specified process group."
5002 #: build/C/man7/signal.7:117
5004 msgid "B<pthread_kill>(3)"
5008 #: build/C/man7/signal.7:121
5010 "Sends a signal to a specified POSIX thread in the same process as the "
5015 #: build/C/man7/signal.7:121
5017 msgid "B<tgkill>(2)"
5021 #: build/C/man7/signal.7:126
5023 "Sends a signal to a specified thread within a specific process. (This is "
5024 "the system call used to implement B<pthread_kill>(3).)"
5028 #: build/C/man7/signal.7:129
5029 msgid "Sends a real-time signal with accompanying data to a specified process."
5033 #: build/C/man7/signal.7:129
5035 msgid "Waiting for a Signal to be Caught"
5039 #: build/C/man7/signal.7:133
5041 "The following system calls suspend execution of the calling process or "
5042 "thread until a signal is caught (or an unhandled signal terminates the "
5047 #: build/C/man7/signal.7:133
5053 #: build/C/man7/signal.7:136
5054 msgid "Suspends execution until any signal is caught."
5058 #: build/C/man7/signal.7:136
5060 msgid "B<sigsuspend>(2)"
5064 #: build/C/man7/signal.7:140
5066 "Temporarily changes the signal mask (see below) and suspends execution until "
5067 "one of the unmasked signals is caught."
5071 #: build/C/man7/signal.7:140
5073 msgid "Synchronously Accepting a Signal"
5077 #: build/C/man7/signal.7:147
5079 "Rather than asynchronously catching a signal via a signal handler, it is "
5080 "possible to synchronously accept the signal, that is, to block execution "
5081 "until the signal is delivered, at which point the kernel returns information "
5082 "about the signal to the caller. There are two general ways to do this:"
5086 #: build/C/man7/signal.7:155
5088 "B<sigwaitinfo>(2), B<sigtimedwait>(2), and B<sigwait>(3) suspend execution "
5089 "until one of the signals in a specified set is delivered. Each of these "
5090 "calls returns information about the delivered signal."
5094 #: build/C/man7/signal.7:168
5096 "B<signalfd>(2) returns a file descriptor that can be used to read "
5097 "information about signals that are delivered to the caller. Each B<read>(2) "
5098 "from this file descriptor blocks until one of the signals in the set "
5099 "specified in the B<signalfd>(2) call is delivered to the caller. The "
5100 "buffer returned by B<read>(2) contains a structure describing the signal."
5104 #: build/C/man7/signal.7:168
5106 msgid "Signal Mask and Pending Signals"
5110 #: build/C/man7/signal.7:175
5112 "A signal may be I<blocked>, which means that it will not be delivered until "
5113 "it is later unblocked. Between the time when it is generated and when it is "
5114 "delivered a signal is said to be I<pending>."
5118 #: build/C/man7/signal.7:184
5120 "Each thread in a process has an independent I<signal mask>, which indicates "
5121 "the set of signals that the thread is currently blocking. A thread can "
5122 "manipulate its signal mask using B<pthread_sigmask>(3). In a traditional "
5123 "single-threaded application, B<sigprocmask>(2) can be used to manipulate "
5128 #: build/C/man7/signal.7:190 build/C/man2/sigprocmask.2:121
5130 "A child created via B<fork>(2) inherits a copy of its parent's signal mask; "
5131 "the signal mask is preserved across B<execve>(2)."
5135 #: build/C/man7/signal.7:207
5137 "A signal may be generated (and thus pending) for a process as a whole "
5138 "(e.g., when sent using B<kill>(2)) or for a specific thread (e.g., certain "
5139 "signals, such as B<SIGSEGV> and B<SIGFPE>, generated as a consequence of "
5140 "executing a specific machine-language instruction are thread directed, as "
5141 "are signals targeted at a specific thread using B<pthread_kill>(3)). A "
5142 "process-directed signal may be delivered to any one of the threads that does "
5143 "not currently have the signal blocked. If more than one of the threads has "
5144 "the signal unblocked, then the kernel chooses an arbitrary thread to which "
5145 "to deliver the signal."
5149 #: build/C/man7/signal.7:214
5151 "A thread can obtain the set of signals that it currently has pending using "
5152 "B<sigpending>(2). This set will consist of the union of the set of pending "
5153 "process-directed signals and the set of signals pending for the calling "
5158 #: build/C/man7/signal.7:220 build/C/man2/sigpending.2:76
5160 "A child created via B<fork>(2) initially has an empty pending signal set; "
5161 "the pending signal set is preserved across an B<execve>(2)."
5165 #: build/C/man7/signal.7:220
5167 msgid "Standard Signals"
5171 #: build/C/man7/signal.7:232
5173 "Linux supports the standard signals listed below. Several signal numbers "
5174 "are architecture-dependent, as indicated in the \"Value\" column. (Where "
5175 "three values are given, the first one is usually valid for alpha and sparc, "
5176 "the middle one for x86, arm, and most other architectures, and the last one "
5177 "for mips. (Values for parisc are I<not> shown; see the kernel source for "
5178 "signal numbering on that architecture.) A - denotes that a signal is absent "
5179 "on the corresponding architecture.)"
5183 #: build/C/man7/signal.7:234
5184 msgid "First the signals described in the original POSIX.1-1990 standard."
5188 #: build/C/man7/signal.7:238 build/C/man7/signal.7:274 build/C/man7/signal.7:303
5190 msgid "Signal\tValue\tAction\tComment\n"
5194 #: build/C/man7/signal.7:239
5196 msgid "SIGHUP\t\\01\tTerm\tHangup detected on controlling terminal\n"
5200 #: build/C/man7/signal.7:240
5202 msgid "\t\t\tor death of controlling process\n"
5206 #: build/C/man7/signal.7:241
5208 msgid "SIGINT\t\\02\tTerm\tInterrupt from keyboard\n"
5212 #: build/C/man7/signal.7:242
5214 msgid "SIGQUIT\t\\03\tCore\tQuit from keyboard\n"
5218 #: build/C/man7/signal.7:243
5220 msgid "SIGILL\t\\04\tCore\tIllegal Instruction\n"
5224 #: build/C/man7/signal.7:244
5226 msgid "SIGABRT\t\\06\tCore\tAbort signal from B<abort>(3)\n"
5230 #: build/C/man7/signal.7:245
5232 msgid "SIGFPE\t\\08\tCore\tFloating point exception\n"
5236 #: build/C/man7/signal.7:246
5238 msgid "SIGKILL\t\\09\tTerm\tKill signal\n"
5242 #: build/C/man7/signal.7:247
5244 msgid "SIGSEGV\t11\tCore\tInvalid memory reference\n"
5248 #: build/C/man7/signal.7:248
5250 msgid "SIGPIPE\t13\tTerm\tBroken pipe: write to pipe with no\n"
5254 #: build/C/man7/signal.7:249
5256 msgid "\t\t\treaders\n"
5260 #: build/C/man7/signal.7:250
5262 msgid "SIGALRM\t14\tTerm\tTimer signal from B<alarm>(2)\n"
5266 #: build/C/man7/signal.7:251
5268 msgid "SIGTERM\t15\tTerm\tTermination signal\n"
5272 #: build/C/man7/signal.7:252
5274 msgid "SIGUSR1\t30,10,16\tTerm\tUser-defined signal 1\n"
5278 #: build/C/man7/signal.7:253
5280 msgid "SIGUSR2\t31,12,17\tTerm\tUser-defined signal 2\n"
5284 #: build/C/man7/signal.7:254
5286 msgid "SIGCHLD\t20,17,18\tIgn\tChild stopped or terminated\n"
5290 #: build/C/man7/signal.7:255
5292 msgid "SIGCONT\t19,18,25\tCont\tContinue if stopped\n"
5296 #: build/C/man7/signal.7:256
5298 msgid "SIGSTOP\t17,19,23\tStop\tStop process\n"
5302 #: build/C/man7/signal.7:257
5304 msgid "SIGTSTP\t18,20,24\tStop\tStop typed at tty\n"
5308 #: build/C/man7/signal.7:258
5310 msgid "SIGTTIN\t21,21,26\tStop\ttty input for background process\n"
5314 #: build/C/man7/signal.7:259
5316 msgid "SIGTTOU\t22,22,27\tStop\ttty output for background process\n"
5320 #: build/C/man7/signal.7:267
5321 msgid "The signals B<SIGKILL> and B<SIGSTOP> cannot be caught, blocked, or ignored."
5325 #: build/C/man7/signal.7:270
5327 "Next the signals not in the POSIX.1-1990 standard but described in SUSv2 and "
5332 #: build/C/man7/signal.7:275
5334 msgid "SIGBUS\t10,7,10\tCore\tBus error (bad memory access)\n"
5338 #: build/C/man7/signal.7:276
5340 msgid "SIGPOLL\t\tTerm\tPollable event (Sys V).\n"
5344 #: build/C/man7/signal.7:277
5346 msgid "\t\t\tSynonym for B<SIGIO>\n"
5350 #: build/C/man7/signal.7:278
5352 msgid "SIGPROF\t27,27,29\tTerm\tProfiling timer expired\n"
5356 #: build/C/man7/signal.7:279
5358 msgid "SIGSYS\t12,31,12\tCore\tBad argument to routine (SVr4)\n"
5362 #: build/C/man7/signal.7:280
5364 msgid "SIGTRAP\t5\tCore\tTrace/breakpoint trap\n"
5368 #: build/C/man7/signal.7:281
5370 msgid "SIGURG\t16,23,21\tIgn\tUrgent condition on socket (4.2BSD)\n"
5374 #: build/C/man7/signal.7:282
5376 msgid "SIGVTALRM\t26,26,28\tTerm\tVirtual alarm clock (4.2BSD)\n"
5380 #: build/C/man7/signal.7:283
5382 msgid "SIGXCPU\t24,24,30\tCore\tCPU time limit exceeded (4.2BSD)\n"
5386 #: build/C/man7/signal.7:284
5388 msgid "SIGXFSZ\t25,25,31\tCore\tFile size limit exceeded (4.2BSD)\n"
5392 #: build/C/man7/signal.7:297
5394 "Up to and including Linux 2.2, the default behavior for B<SIGSYS>, "
5395 "B<SIGXCPU>, B<SIGXFSZ>, and (on architectures other than SPARC and MIPS) "
5396 "B<SIGBUS> was to terminate the process (without a core dump). (On some "
5397 "other UNIX systems the default action for B<SIGXCPU> and B<SIGXFSZ> is to "
5398 "terminate the process without a core dump.) Linux 2.4 conforms to the "
5399 "POSIX.1-2001 requirements for these signals, terminating the process with a "
5404 #: build/C/man7/signal.7:299
5405 msgid "Next various other signals."
5409 #: build/C/man7/signal.7:304
5411 msgid "SIGIOT\t6\tCore\tIOT trap. A synonym for B<SIGABRT>\n"
5415 #: build/C/man7/signal.7:305
5417 msgid "SIGEMT\t7,-,7\tTerm\n"
5421 #: build/C/man7/signal.7:306
5423 msgid "SIGSTKFLT\t-,16,-\tTerm\tStack fault on coprocessor (unused)\n"
5427 #: build/C/man7/signal.7:307
5429 msgid "SIGIO\t23,29,22\tTerm\tI/O now possible (4.2BSD)\n"
5433 #: build/C/man7/signal.7:308
5435 msgid "SIGCLD\t-,-,18\tIgn\tA synonym for B<SIGCHLD>\n"
5439 #: build/C/man7/signal.7:309
5441 msgid "SIGPWR\t29,30,19\tTerm\tPower failure (System V)\n"
5445 #: build/C/man7/signal.7:310
5447 msgid "SIGINFO\t29,-,-\t\tA synonym for B<SIGPWR>\n"
5451 #: build/C/man7/signal.7:311
5453 msgid "SIGLOST\t-,-,-\tTerm\tFile lock lost (unused)\n"
5457 #: build/C/man7/signal.7:312
5459 msgid "SIGWINCH\t28,28,20\tIgn\tWindow resize signal (4.3BSD, Sun)\n"
5463 #: build/C/man7/signal.7:313
5465 msgid "SIGUNUSED\t-,31,-\tCore\tSynonymous with B<SIGSYS>\n"
5469 #: build/C/man7/signal.7:323
5470 msgid "(Signal 29 is B<SIGINFO> / B<SIGPWR> on an alpha but B<SIGLOST> on a sparc.)"
5474 #: build/C/man7/signal.7:329
5476 "B<SIGEMT> is not specified in POSIX.1-2001, but nevertheless appears on most "
5477 "other UNIX systems, where its default action is typically to terminate the "
5478 "process with a core dump."
5482 #: build/C/man7/signal.7:333
5484 "B<SIGPWR> (which is not specified in POSIX.1-2001) is typically ignored by "
5485 "default on those other UNIX systems where it appears."
5489 #: build/C/man7/signal.7:337
5491 "B<SIGIO> (which is not specified in POSIX.1-2001) is ignored by default on "
5492 "several other UNIX systems."
5495 #. parisc is the only exception: SIGSYS is 12, SIGUNUSED is 31
5497 #: build/C/man7/signal.7:344
5499 "Where defined, B<SIGUNUSED> is synonymous with B<SIGSYS> on most "
5504 #: build/C/man7/signal.7:344
5506 msgid "Real-time Signals"
5510 #: build/C/man7/signal.7:354
5512 "Linux supports real-time signals as originally defined in the POSIX.1b "
5513 "real-time extensions (and now included in POSIX.1-2001). The range of "
5514 "supported real-time signals is defined by the macros B<SIGRTMIN> and "
5515 "B<SIGRTMAX>. POSIX.1-2001 requires that an implementation support at least "
5516 "B<_POSIX_RTSIG_MAX> (8) real-time signals."
5520 #: build/C/man7/signal.7:376
5522 "The Linux kernel supports a range of 32 different real-time signals, "
5523 "numbered 33 to 64. However, the glibc POSIX threads implementation "
5524 "internally uses two (for NPTL) or three (for LinuxThreads) real-time signals "
5525 "(see B<pthreads>(7)), and adjusts the value of B<SIGRTMIN> suitably (to 34 "
5526 "or 35). Because the range of available real-time signals varies according "
5527 "to the glibc threading implementation (and this variation can occur at run "
5528 "time according to the available kernel and glibc), and indeed the range of "
5529 "real-time signals varies across UNIX systems, programs should I<never refer "
5530 "to real-time signals using hard-coded numbers>, but instead should always "
5531 "refer to real-time signals using the notation B<SIGRTMIN>+n, and include "
5532 "suitable (run-time) checks that B<SIGRTMIN>+n does not exceed B<SIGRTMAX>."
5536 #: build/C/man7/signal.7:380
5538 "Unlike standard signals, real-time signals have no predefined meanings: the "
5539 "entire set of real-time signals can be used for application-defined "
5544 #: build/C/man7/signal.7:383
5546 "The default action for an unhandled real-time signal is to terminate the "
5547 "receiving process."
5551 #: build/C/man7/signal.7:385
5552 msgid "Real-time signals are distinguished by the following:"
5556 #: build/C/man7/signal.7:389
5558 "Multiple instances of real-time signals can be queued. By contrast, if "
5559 "multiple instances of a standard signal are delivered while that signal is "
5560 "currently blocked, then only one instance is queued."
5564 #: build/C/man7/signal.7:409
5566 "If the signal is sent using B<sigqueue>(3), an accompanying value (either an "
5567 "integer or a pointer) can be sent with the signal. If the receiving process "
5568 "establishes a handler for this signal using the B<SA_SIGINFO> flag to "
5569 "B<sigaction>(2) then it can obtain this data via the I<si_value> field of "
5570 "the I<siginfo_t> structure passed as the second argument to the handler. "
5571 "Furthermore, the I<si_pid> and I<si_uid> fields of this structure can be "
5572 "used to obtain the PID and real user ID of the process sending the signal."
5576 #: build/C/man7/signal.7:418
5578 "Real-time signals are delivered in a guaranteed order. Multiple real-time "
5579 "signals of the same type are delivered in the order they were sent. If "
5580 "different real-time signals are sent to a process, they are delivered "
5581 "starting with the lowest-numbered signal. (I.e., low-numbered signals have "
5582 "highest priority.) By contrast, if multiple standard signals are pending "
5583 "for a process, the order in which they are delivered is unspecified."
5587 #: build/C/man7/signal.7:423
5589 "If both standard and real-time signals are pending for a process, POSIX "
5590 "leaves it unspecified which is delivered first. Linux, like many other "
5591 "implementations, gives priority to standard signals in this case."
5595 #: build/C/man7/signal.7:446
5597 "According to POSIX, an implementation should permit at least "
5598 "B<_POSIX_SIGQUEUE_MAX> (32) real-time signals to be queued to a process. "
5599 "However, Linux does things differently. In kernels up to and including "
5600 "2.6.7, Linux imposes a system-wide limit on the number of queued real-time "
5601 "signals for all processes. This limit can be viewed and (with privilege) "
5602 "changed via the I</proc/sys/kernel/rtsig-max> file. A related file, "
5603 "I</proc/sys/kernel/rtsig-nr>, can be used to find out how many real-time "
5604 "signals are currently queued. In Linux 2.6.8, these I</proc> interfaces "
5605 "were replaced by the B<RLIMIT_SIGPENDING> resource limit, which specifies a "
5606 "per-user limit for queued signals; see B<setrlimit>(2) for further details."
5610 #: build/C/man7/signal.7:446
5612 msgid "Async-signal-safe functions"
5616 #: build/C/man7/signal.7:455
5618 "A signal handler function must be very careful, since processing elsewhere "
5619 "may be interrupted at some arbitrary point in the execution of the program. "
5620 "POSIX has the concept of \"safe function\". If a signal interrupts the "
5621 "execution of an unsafe function, and I<handler> calls an unsafe function, "
5622 "then the behavior of the program is undefined."
5626 #: build/C/man7/signal.7:459
5628 "POSIX.1-2004 (also known as POSIX.1-2001 Technical Corrigendum 2) requires "
5629 "an implementation to guarantee that the following functions can be safely "
5630 "called inside a signal handler:"
5634 #: build/C/man7/signal.7:580
5694 "posix_trace_event()\n"
5744 "timer_getoverrun()\n"
5758 #: build/C/man7/signal.7:585
5760 "POSIX.1-2008 removes fpathconf(), pathconf(), and sysconf() from the above "
5761 "list, and adds the following functions:"
5765 #: build/C/man7/signal.7:608
5791 #: build/C/man7/signal.7:610
5793 msgid "Interruption of System Calls and Library Functions by Signal Handlers"
5797 #: build/C/man7/signal.7:613
5799 "If a signal handler is invoked while a system call or library function call "
5800 "is blocked, then either:"
5804 #: build/C/man7/signal.7:615
5805 msgid "the call is automatically restarted after the signal handler returns; or"
5809 #: build/C/man7/signal.7:618
5810 msgid "the call fails with the error B<EINTR>."
5814 #: build/C/man7/signal.7:626
5816 "Which of these two behaviors occurs depends on the interface and whether or "
5817 "not the signal handler was established using the B<SA_RESTART> flag (see "
5818 "B<sigaction>(2)). The details vary across UNIX systems; below, the details "
5822 #. The following system calls use ERESTARTSYS,
5823 #. so that they are restartable
5825 #: build/C/man7/signal.7:635
5827 "If a blocked call to one of the following interfaces is interrupted by a "
5828 "signal handler, then the call will be automatically restarted after the "
5829 "signal handler returns if the B<SA_RESTART> flag was used; otherwise the "
5830 "call will fail with the error B<EINTR>:"
5834 #: build/C/man7/signal.7:651
5836 "B<read>(2), B<readv>(2), B<write>(2), B<writev>(2), and B<ioctl>(2) calls "
5837 "on \"slow\" devices. A \"slow\" device is one where the I/O call may block "
5838 "for an indefinite time, for example, a terminal, pipe, or socket. (A disk "
5839 "is not a slow device according to this definition.) If an I/O call on a "
5840 "slow device has already transferred some data by the time it is interrupted "
5841 "by a signal handler, then the call will return a success status (normally, "
5842 "the number of bytes transferred)."
5846 #: build/C/man7/signal.7:655
5847 msgid "B<open>(2), if it can block (e.g., when opening a FIFO; see B<fifo>(7))."
5851 #: build/C/man7/signal.7:662
5852 msgid "B<wait>(2), B<wait3>(2), B<wait4>(2), B<waitid>(2), and B<waitpid>(2)."
5855 #. If a timeout (setsockopt()) is in effect on the socket, then these
5856 #. system calls switch to using EINTR. Consequently, they and are not
5857 #. automatically restarted, and they show the stop/cont behavior
5858 #. described below. (Verified from 2.6.26 source, and by experiment; mtk)
5860 #: build/C/man7/signal.7:678
5862 "Socket interfaces: B<accept>(2), B<connect>(2), B<recv>(2), B<recvfrom>(2), "
5863 "B<recvmsg>(2), B<send>(2), B<sendto>(2), and B<sendmsg>(2), unless a timeout "
5864 "has been set on the socket (see below)."
5868 #: build/C/man7/signal.7:684
5869 msgid "File locking interfaces: B<flock>(2) and B<fcntl>(2) B<F_SETLKW>."
5873 #: build/C/man7/signal.7:691
5875 "POSIX message queue interfaces: B<mq_receive>(3), B<mq_timedreceive>(3), "
5876 "B<mq_send>(3), and B<mq_timedsend>(3)."
5880 #: build/C/man7/signal.7:696
5882 "B<futex>(2) B<FUTEX_WAIT> (since Linux 2.6.22; beforehand, always failed "
5887 #: build/C/man7/signal.7:703
5889 "POSIX semaphore interfaces: B<sem_wait>(3) and B<sem_timedwait>(3) (since "
5890 "Linux 2.6.22; beforehand, always failed with B<EINTR>)."
5893 #. These are the system calls that give EINTR or ERESTARTNOHAND
5894 #. on interruption by a signal handler.
5896 #: build/C/man7/signal.7:714
5898 "The following interfaces are never restarted after being interrupted by a "
5899 "signal handler, regardless of the use of B<SA_RESTART>; they always fail "
5900 "with the error B<EINTR> when interrupted by a signal handler:"
5904 #: build/C/man7/signal.7:734 build/C/man7/signal.7:808
5906 "Socket interfaces, when a timeout has been set on the socket using "
5907 "B<setsockopt>(2): B<accept>(2), B<recv>(2), B<recvfrom>(2), and "
5908 "B<recvmsg>(2), if a receive timeout (B<SO_RCVTIMEO>) has been set; "
5909 "B<connect>(2), B<send>(2), B<sendto>(2), and B<sendmsg>(2), if a send "
5910 "timeout (B<SO_SNDTIMEO>) has been set."
5914 #: build/C/man7/signal.7:741
5916 "Interfaces used to wait for signals: B<pause>(2), B<sigsuspend>(2), "
5917 "B<sigtimedwait>(2), and B<sigwaitinfo>(2)."
5921 #: build/C/man7/signal.7:750
5923 "File descriptor multiplexing interfaces: B<epoll_wait>(2), "
5924 "B<epoll_pwait>(2), B<poll>(2), B<ppoll>(2), B<select>(2), and B<pselect>(2)."
5927 #. On some other systems, SA_RESTART does restart these system calls
5929 #: build/C/man7/signal.7:758
5931 "System V IPC interfaces: B<msgrcv>(2), B<msgsnd>(2), B<semop>(2), and "
5936 #: build/C/man7/signal.7:764
5937 msgid "Sleep interfaces: B<clock_nanosleep>(2), B<nanosleep>(2), and B<usleep>(3)."
5941 #: build/C/man7/signal.7:769 build/C/man7/signal.7:822
5942 msgid "B<read>(2) from an B<inotify>(7) file descriptor."
5946 #: build/C/man7/signal.7:771
5947 msgid "B<io_getevents>(2)."
5951 #: build/C/man7/signal.7:777
5953 "The B<sleep>(3) function is also never restarted if interrupted by a "
5954 "handler, but gives a success return: the number of seconds remaining to "
5959 #: build/C/man7/signal.7:777
5961 msgid "Interruption of System Calls and Library Functions by Stop Signals"
5965 #: build/C/man7/signal.7:786
5967 "On Linux, even in the absence of signal handlers, certain blocking "
5968 "interfaces can fail with the error B<EINTR> after the process is stopped by "
5969 "one of the stop signals and then resumed via B<SIGCONT>. This behavior is "
5970 "not sanctioned by POSIX.1, and doesn't occur on other systems."
5974 #: build/C/man7/signal.7:788
5975 msgid "The Linux interfaces that display this behavior are:"
5979 #: build/C/man7/signal.7:811
5980 msgid "B<epoll_wait>(2), B<epoll_pwait>(2)."
5984 #: build/C/man7/signal.7:814
5985 msgid "B<semop>(2), B<semtimedop>(2)."
5989 #: build/C/man7/signal.7:817
5990 msgid "B<sigtimedwait>(2), B<sigwaitinfo>(2)."
5994 #: build/C/man7/signal.7:828
5996 "Linux 2.6.21 and earlier: B<futex>(2) B<FUTEX_WAIT>, B<sem_timedwait>(3), "
6001 #: build/C/man7/signal.7:832
6002 msgid "Linux 2.6.8 and earlier: B<msgrcv>(2), B<msgsnd>(2)."
6006 #: build/C/man7/signal.7:835
6007 msgid "Linux 2.4 and earlier: B<nanosleep>(2)."
6010 #. It must be a *very* long time since this was true:
6015 #. have the same value.
6016 #. The latter is commented out in the kernel source, but
6017 #. the build process of some software still thinks that
6021 #: build/C/man7/signal.7:848
6022 msgid "POSIX.1, except as noted."
6026 #: build/C/man7/signal.7:881
6028 "B<kill>(1), B<getrlimit>(2), B<kill>(2), B<killpg>(2), "
6029 "B<rt_sigqueueinfo>(2), B<setitimer>(2), B<setrlimit>(2), B<sgetmask>(2), "
6030 "B<sigaction>(2), B<sigaltstack>(2), B<signal>(2), B<signalfd>(2), "
6031 "B<sigpending>(2), B<sigprocmask>(2), B<sigsuspend>(2), B<sigwaitinfo>(2), "
6032 "B<abort>(3), B<bsd_signal>(3), B<longjmp>(3), B<raise>(3), "
6033 "B<pthread_sigqueue>(3), B<sigqueue>(3), B<sigset>(3), B<sigsetops>(3), "
6034 "B<sigvec>(3), B<sigwait>(3), B<strsignal>(3), B<sysv_signal>(3), B<core>(5), "
6035 "B<proc>(5), B<pthreads>(7), B<sigevent>(7)"
6039 #: build/C/man2/signalfd.2:19
6045 #: build/C/man2/signalfd.2:19
6051 #: build/C/man2/signalfd.2:22
6052 msgid "signalfd - create a file descriptor for accepting signals"
6056 #: build/C/man2/signalfd.2:24
6057 msgid "B<#include E<lt>sys/signalfd.hE<gt>>"
6061 #: build/C/man2/signalfd.2:26
6062 msgid "B<int signalfd(int >I<fd>B<, const sigset_t *>I<mask>B<, int >I<flags>B<);>"
6066 #: build/C/man2/signalfd.2:37
6068 "B<signalfd>() creates a file descriptor that can be used to accept signals "
6069 "targeted at the caller. This provides an alternative to the use of a signal "
6070 "handler or B<sigwaitinfo>(2), and has the advantage that the file descriptor "
6071 "may be monitored by B<select>(2), B<poll>(2), and B<epoll>(7)."
6075 #: build/C/man2/signalfd.2:57
6077 "The I<mask> argument specifies the set of signals that the caller wishes to "
6078 "accept via the file descriptor. This argument is a signal set whose "
6079 "contents can be initialized using the macros described in B<sigsetops>(3). "
6080 "Normally, the set of signals to be received via the file descriptor should "
6081 "be blocked using B<sigprocmask>(2), to prevent the signals being handled "
6082 "according to their default dispositions. It is not possible to receive "
6083 "B<SIGKILL> or B<SIGSTOP> signals via a signalfd file descriptor; these "
6084 "signals are silently ignored if specified in I<mask>."
6088 #: build/C/man2/signalfd.2:71
6090 "If the I<fd> argument is -1, then the call creates a new file descriptor and "
6091 "associates the signal set specified in I<mask> with that descriptor. If "
6092 "I<fd> is not -1, then it must specify a valid existing signalfd file "
6093 "descriptor, and I<mask> is used to replace the signal set associated with "
6098 #: build/C/man2/signalfd.2:76
6100 "Starting with Linux 2.6.27, the following values may be bitwise ORed in "
6101 "I<flags> to change the behaviour of B<signalfd>():"
6105 #: build/C/man2/signalfd.2:76
6107 msgid "B<SFD_NONBLOCK>"
6111 #: build/C/man2/signalfd.2:84
6113 msgid "B<SFD_CLOEXEC>"
6117 #: build/C/man2/signalfd.2:101
6119 "B<signalfd>() returns a file descriptor that supports the following "
6124 #: build/C/man2/signalfd.2:120
6126 "If one or more of the signals specified in I<mask> is pending for the "
6127 "process, then the buffer supplied to B<read>(2) is used to return one or "
6128 "more I<signalfd_siginfo> structures (see below) that describe the signals. "
6129 "The B<read>(2) returns information for as many signals as are pending and "
6130 "will fit in the supplied buffer. The buffer must be at least "
6131 "I<sizeof(struct signalfd_siginfo)> bytes. The return value of the "
6132 "B<read>(2) is the total number of bytes read."
6136 #: build/C/man2/signalfd.2:128
6138 "As a consequence of the B<read>(2), the signals are consumed, so that they "
6139 "are no longer pending for the process (i.e., will not be caught by signal "
6140 "handlers, and cannot be accepted using B<sigwaitinfo>(2))."
6144 #: build/C/man2/signalfd.2:139
6146 "If none of the signals in I<mask> is pending for the process, then the "
6147 "B<read>(2) either blocks until one of the signals in I<mask> is generated "
6148 "for the process, or fails with the error B<EAGAIN> if the file descriptor "
6149 "has been made nonblocking."
6153 #: build/C/man2/signalfd.2:152
6155 "The file descriptor is readable (the B<select>(2) I<readfds> argument; the "
6156 "B<poll>(2) B<POLLIN> flag) if one or more of the signals in I<mask> is "
6157 "pending for the process."
6161 #: build/C/man2/signalfd.2:159
6163 "The signalfd file descriptor also supports the other file-descriptor "
6164 "multiplexing APIs: B<pselect>(2), B<ppoll>(2), and B<epoll>(7)."
6168 #: build/C/man2/signalfd.2:164
6170 "When the file descriptor is no longer required it should be closed. When "
6171 "all file descriptors associated with the same signalfd object have been "
6172 "closed, the resources for object are freed by the kernel."
6176 #: build/C/man2/signalfd.2:164
6178 msgid "The signalfd_siginfo structure"
6182 #: build/C/man2/signalfd.2:170
6184 "The format of the I<signalfd_siginfo> structure(s) returned by B<read>(2)s "
6185 "from a signalfd file descriptor is as follows:"
6188 #. ssi_trapno is unused on most arches
6190 #: build/C/man2/signalfd.2:195
6193 "struct signalfd_siginfo {\n"
6194 " uint32_t ssi_signo; /* Signal number */\n"
6195 " int32_t ssi_errno; /* Error number (unused) */\n"
6196 " int32_t ssi_code; /* Signal code */\n"
6197 " uint32_t ssi_pid; /* PID of sender */\n"
6198 " uint32_t ssi_uid; /* Real UID of sender */\n"
6199 " int32_t ssi_fd; /* File descriptor (SIGIO) */\n"
6200 " uint32_t ssi_tid; /* Kernel timer ID (POSIX timers)\n"
6201 " uint32_t ssi_band; /* Band event (SIGIO) */\n"
6202 " uint32_t ssi_overrun; /* POSIX timer overrun count */\n"
6203 " uint32_t ssi_trapno; /* Trap number that caused signal */\n"
6204 " int32_t ssi_status; /* Exit status or signal (SIGCHLD) */\n"
6205 " int32_t ssi_int; /* Integer sent by sigqueue(3) */\n"
6206 " uint64_t ssi_ptr; /* Pointer sent by sigqueue(3) */\n"
6207 " uint64_t ssi_utime; /* User CPU time consumed (SIGCHLD) */\n"
6208 " uint64_t ssi_stime; /* System CPU time consumed (SIGCHLD) */\n"
6209 " uint64_t ssi_addr; /* Address that generated signal\n"
6210 " (for hardware-generated signals) */\n"
6211 " uint8_t pad[I<X>]; /* Pad size to 128 bytes (allow for\n"
6212 " additional fields in the future) */\n"
6217 #: build/C/man2/signalfd.2:218
6219 "Each of the fields in this structure is analogous to the similarly named "
6220 "field in the I<siginfo_t> structure. The I<siginfo_t> structure is "
6221 "described in B<sigaction>(2). Not all fields in the returned "
6222 "I<signalfd_siginfo> structure will be valid for a specific signal; the set "
6223 "of valid fields can be determined from the value returned in the I<ssi_code> "
6224 "field. This field is the analog of the I<siginfo_t> I<si_code> field; see "
6225 "B<sigaction>(2) for details."
6229 #: build/C/man2/signalfd.2:218 build/C/man2/timerfd_create.2:268
6231 msgid "fork(2) semantics"
6235 #: build/C/man2/signalfd.2:226
6237 "After a B<fork>(2), the child inherits a copy of the signalfd file "
6238 "descriptor. A B<read>(2) from the file descriptor in the child will return "
6239 "information about signals queued to the child."
6243 #: build/C/man2/signalfd.2:226 build/C/man2/timerfd_create.2:280
6245 msgid "execve(2) semantics"
6249 #: build/C/man2/signalfd.2:238
6251 "Just like any other file descriptor, a signalfd file descriptor remains open "
6252 "across an B<execve>(2), unless it has been marked for close-on-exec (see "
6253 "B<fcntl>(2)). Any signals that were available for reading before the "
6254 "B<execve>(2) remain available to the newly loaded program. (This is "
6255 "analogous to traditional signal semantics, where a blocked signal that is "
6256 "pending remains pending across an B<execve>(2).)"
6260 #: build/C/man2/signalfd.2:238
6262 msgid "Thread semantics"
6266 #: build/C/man2/signalfd.2:248
6268 "The semantics of signalfd file descriptors in a multithreaded program mirror "
6269 "the standard semantics for signals. In other words, when a thread reads "
6270 "from a signalfd file descriptor, it will read the signals that are directed "
6271 "to the thread itself and the signals that are directed to the process (i.e., "
6272 "the entire thread group). (A thread will not be able to read signals that "
6273 "are directed to other threads in the process.)"
6277 #: build/C/man2/signalfd.2:262
6279 "On success, B<signalfd>() returns a signalfd file descriptor; this is "
6280 "either a new file descriptor (if I<fd> was -1), or I<fd> if I<fd> was a "
6281 "valid signalfd file descriptor. On error, -1 is returned and I<errno> is "
6282 "set to indicate the error."
6286 #: build/C/man2/signalfd.2:263 build/C/man2/timerfd_create.2:337
6292 #: build/C/man2/signalfd.2:268
6293 msgid "The I<fd> file descriptor is not a valid file descriptor."
6298 #. argument is not equal to
6299 #. .IR sizeof(sigset_t) ;
6301 #: build/C/man2/signalfd.2:276
6302 msgid "I<fd> is not a valid signalfd file descriptor."
6306 #: build/C/man2/signalfd.2:283 build/C/man2/timerfd_create.2:319
6307 msgid "I<flags> is invalid; or, in Linux 2.6.26 or earlier, I<flags> is nonzero."
6311 #: build/C/man2/signalfd.2:286 build/C/man2/timerfd_create.2:322
6312 msgid "The per-process limit of open file descriptors has been reached."
6316 #: build/C/man2/signalfd.2:296
6317 msgid "There was insufficient memory to create a new signalfd file descriptor."
6320 #. signalfd() is in glibc 2.7, but reportedly does not build
6322 #: build/C/man2/signalfd.2:304
6324 "B<signalfd>() is available on Linux since kernel 2.6.22. Working support "
6325 "is provided in glibc since version 2.8. The B<signalfd4>() system call "
6326 "(see NOTES) is available on Linux since kernel 2.6.27."
6330 #: build/C/man2/signalfd.2:309
6331 msgid "B<signalfd>() and B<signalfd4>() are Linux-specific."
6335 #: build/C/man2/signalfd.2:319
6337 "The underlying Linux system call requires an additional argument, I<size_t "
6338 "sizemask>, which specifies the size of the I<mask> argument. The glibc "
6339 "B<signalfd>() wrapper function does not include this argument, since it "
6340 "provides the required value for the underlying system call."
6344 #: build/C/man2/signalfd.2:333
6346 "A process can create multiple signalfd file descriptors. This makes it "
6347 "possible to accept different signals on different file descriptors. (This "
6348 "may be useful if monitoring the file descriptors using B<select>(2), "
6349 "B<poll>(2), or B<epoll>(7): the arrival of different signals will make "
6350 "different descriptors ready.) If a signal appears in the I<mask> of more "
6351 "than one of the file descriptors, then occurrences of that signal can be "
6352 "read (once) from any one of the descriptors."
6356 #: build/C/man2/signalfd.2:349
6358 "There are two underlying Linux system calls: B<signalfd>() and the more "
6359 "recent B<signalfd4>(). The former system call does not implement a I<flags> "
6360 "argument. The latter system call implements the I<flags> values described "
6361 "above. Starting with glibc 2.9, the B<signalfd>() wrapper function will "
6362 "use B<signalfd4>() where it is available."
6365 #. The fix also was put into 2.6.24.5
6367 #: build/C/man2/signalfd.2:357
6369 "In kernels before 2.6.25, the I<ssi_ptr> and I<ssi_int> fields are not "
6370 "filled in with the data accompanying a signal sent by B<sigqueue>(3)."
6374 #: build/C/man2/signalfd.2:367
6376 "The program below accepts the signals B<SIGINT> and B<SIGQUIT> via a "
6377 "signalfd file descriptor. The program terminates after accepting a "
6378 "B<SIGQUIT> signal. The following shell session demonstrates the use of the "
6383 #: build/C/man2/signalfd.2:378
6386 "$B< ./signalfd_demo>\n"
6387 "B<^C> # Control-C generates SIGINT\n"
6391 "B<^\\e> # Control-\\e generates SIGQUIT\n"
6397 #: build/C/man2/signalfd.2:388
6400 "#include E<lt>sys/signalfd.hE<gt>\n"
6401 "#include E<lt>signal.hE<gt>\n"
6402 "#include E<lt>unistd.hE<gt>\n"
6403 "#include E<lt>stdlib.hE<gt>\n"
6404 "#include E<lt>stdio.hE<gt>\n"
6408 #: build/C/man2/signalfd.2:399
6412 "main(int argc, char *argv[])\n"
6416 " struct signalfd_siginfo fdsi;\n"
6421 #: build/C/man2/signalfd.2:403
6424 " sigemptyset(&mask);\n"
6425 " sigaddset(&mask, SIGINT);\n"
6426 " sigaddset(&mask, SIGQUIT);\n"
6430 #: build/C/man2/signalfd.2:406
6433 " /* Block signals so that they aren\\(aqt handled\n"
6434 " according to their default dispositions */\n"
6438 #: build/C/man2/signalfd.2:409
6441 " if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1)\n"
6442 " handle_error(\"sigprocmask\");\n"
6446 #: build/C/man2/signalfd.2:413
6449 " sfd = signalfd(-1, &mask, 0);\n"
6451 " handle_error(\"signalfd\");\n"
6455 #: build/C/man2/signalfd.2:418
6459 " s = read(sfd, &fdsi, sizeof(struct signalfd_siginfo));\n"
6460 " if (s != sizeof(struct signalfd_siginfo))\n"
6461 " handle_error(\"read\");\n"
6465 #: build/C/man2/signalfd.2:429
6468 " if (fdsi.ssi_signo == SIGINT) {\n"
6469 " printf(\"Got SIGINT\\en\");\n"
6470 " } else if (fdsi.ssi_signo == SIGQUIT) {\n"
6471 " printf(\"Got SIGQUIT\\en\");\n"
6472 " exit(EXIT_SUCCESS);\n"
6474 " printf(\"Read unexpected signal\\en\");\n"
6481 #: build/C/man2/signalfd.2:443
6483 "B<eventfd>(2), B<poll>(2), B<read>(2), B<select>(2), B<sigaction>(2), "
6484 "B<sigprocmask>(2), B<sigwaitinfo>(2), B<timerfd_create>(2), B<sigsetops>(3), "
6485 "B<sigwait>(3), B<epoll>(7), B<signal>(7)"
6489 #: build/C/man3/sigpause.3:23
6495 #: build/C/man3/sigpause.3:23
6501 #: build/C/man3/sigpause.3:26
6502 msgid "sigpause - atomically release blocked signals and wait for interrupt"
6506 #: build/C/man3/sigpause.3:31
6508 msgid "B<int sigpause(int >I<sigmask>B<); /* BSD */>\n"
6512 #: build/C/man3/sigpause.3:33
6514 msgid "B<int sigpause(int >I<sig>B<); /* System V / UNIX 95 */>\n"
6518 #: build/C/man3/sigpause.3:39
6519 msgid "Don't use this function. Use B<sigsuspend>(2) instead."
6523 #: build/C/man3/sigpause.3:46
6525 "The function B<sigpause>() is designed to wait for some signal. It changes "
6526 "the process's signal mask (set of blocked signals), and then waits for a "
6527 "signal to arrive. Upon arrival of a signal, the original signal mask is "
6532 #: build/C/man3/sigpause.3:54
6534 "If B<sigpause>() returns, it was interrupted by a signal and the return "
6535 "value is -1 with I<errno> set to B<EINTR>."
6539 #: build/C/man3/sigpause.3:58
6540 msgid "The System V version of B<sigpause>() is standardized in POSIX.1-2001."
6543 #. __xpg_sigpause: UNIX 95, spec 1170, SVID, SVr4, XPG
6545 #: build/C/man3/sigpause.3:75
6547 "The classical BSD version of this function appeared in 4.2BSD. It sets the "
6548 "process's signal mask to I<sigmask>. UNIX 95 standardized the incompatible "
6549 "System V version of this function, which removes only the specified signal "
6550 "I<sig> from the process's signal mask. The unfortunate situation with two "
6551 "incompatible functions with the same name was solved by the "
6552 "B<\\%sigsuspend>(2) function, that takes a I<sigset_t *> argument (instead "
6557 #: build/C/man3/sigpause.3:78
6559 "On Linux, this routine is a system call only on the Sparc (sparc64) "
6564 #: build/C/man3/sigpause.3:80
6565 msgid "Libc4 and libc5 only know about the BSD version."
6569 #. For the BSD version, one usually uses a zero
6571 #. to indicate that no signals are to be blocked.
6573 #: build/C/man3/sigpause.3:96
6575 "Glibc uses the BSD version if the B<_BSD_SOURCE> feature test macro is "
6576 "defined and none of B<_POSIX_SOURCE>, B<_POSIX_C_SOURCE>, B<_XOPEN_SOURCE>, "
6577 "B<_GNU_SOURCE>, or B<_SVID_SOURCE> is defined. Otherwise, the System V "
6582 #: build/C/man3/sigpause.3:104
6584 "B<kill>(2), B<sigaction>(2), B<sigprocmask>(2), B<sigsuspend>(2), "
6585 "B<sigblock>(3), B<sigvec>(3), B<feature_test_macros>(7)"
6589 #: build/C/man2/sigpending.2:27
6595 #: build/C/man2/sigpending.2:27
6601 #: build/C/man2/sigpending.2:30
6602 msgid "sigpending - examine pending signals"
6606 #: build/C/man2/sigpending.2:34
6607 msgid "B<int sigpending(sigset_t *>I<set>B<);>"
6611 #: build/C/man2/sigpending.2:43
6613 "B<sigpending>(): _POSIX_C_SOURCE\\ E<gt>=\\ 1 || _XOPEN_SOURCE || "
6618 #: build/C/man2/sigpending.2:51
6620 "B<sigpending>() returns the set of signals that are pending for delivery to "
6621 "the calling thread (i.e., the signals which have been raised while "
6622 "blocked). The mask of pending signals is returned in I<set>."
6626 #: build/C/man2/sigpending.2:54
6627 msgid "B<sigpending>() returns 0 on success and -1 on error."
6631 #: build/C/man2/sigpending.2:59
6633 "I<set> points to memory which is not a valid part of the process address "
6638 #: build/C/man2/sigpending.2:70
6640 "The set of signals that is pending for a thread is the union of the set of "
6641 "signals that is pending for that thread and the set of signals that is "
6642 "pending for the process as a whole; see B<signal>(7)."
6646 #: build/C/man2/sigpending.2:82
6648 "In versions of glibc up to and including 2.2.1, there is a bug in the "
6649 "wrapper function for B<sigpending>() which means that information about "
6650 "pending real-time signals is not correctly returned."
6654 #: build/C/man2/sigpending.2:90
6656 "B<kill>(2), B<sigaction>(2), B<signal>(2), B<sigprocmask>(2), "
6657 "B<sigsuspend>(2), B<sigsetops>(3), B<signal>(7)"
6661 #: build/C/man2/sigprocmask.2:27
6667 #: build/C/man2/sigprocmask.2:27
6673 #: build/C/man2/sigprocmask.2:30
6674 msgid "sigprocmask - examine and change blocked signals"
6678 #: build/C/man2/sigprocmask.2:35
6680 "B<int sigprocmask(int >I<how>B<, const sigset_t *>I<set>B<,> B<sigset_t "
6685 #: build/C/man2/sigprocmask.2:44
6687 "B<sigprocmask>(): _POSIX_C_SOURCE\\ E<gt>=\\ 1 || _XOPEN_SOURCE || "
6692 #: build/C/man2/sigprocmask.2:53
6694 "B<sigprocmask>() is used to fetch and/or change the signal mask of the "
6695 "calling thread. The signal mask is the set of signals whose delivery is "
6696 "currently blocked for the caller (see also B<signal>(7) for more details)."
6700 #: build/C/man2/sigprocmask.2:57
6701 msgid "The behavior of the call is dependent on the value of I<how>, as follows."
6705 #: build/C/man2/sigprocmask.2:57
6707 msgid "B<SIG_BLOCK>"
6711 #: build/C/man2/sigprocmask.2:62
6713 "The set of blocked signals is the union of the current set and the I<set> "
6718 #: build/C/man2/sigprocmask.2:62
6720 msgid "B<SIG_UNBLOCK>"
6724 #: build/C/man2/sigprocmask.2:68
6726 "The signals in I<set> are removed from the current set of blocked signals. "
6727 "It is permissible to attempt to unblock a signal which is not blocked."
6731 #: build/C/man2/sigprocmask.2:68
6733 msgid "B<SIG_SETMASK>"
6737 #: build/C/man2/sigprocmask.2:72
6738 msgid "The set of blocked signals is set to the argument I<set>."
6742 #: build/C/man2/sigprocmask.2:77
6744 "If I<oldset> is non-NULL, the previous value of the signal mask is stored in "
6749 #: build/C/man2/sigprocmask.2:86
6751 "If I<set> is NULL, then the signal mask is unchanged (i.e., I<how> is "
6752 "ignored), but the current value of the signal mask is nevertheless returned "
6753 "in I<oldset> (if it is not NULL)."
6757 #: build/C/man2/sigprocmask.2:91
6759 "The use of B<sigprocmask>() is unspecified in a multithreaded process; see "
6760 "B<pthread_sigmask>(3)."
6764 #: build/C/man2/sigprocmask.2:94
6765 msgid "B<sigprocmask>() returns 0 on success and -1 on error."
6769 #: build/C/man2/sigprocmask.2:102
6771 "the I<set> or I<oldset> argument points outside the process's allocated "
6776 #: build/C/man2/sigprocmask.2:107
6777 msgid "The value specified in I<how> was invalid."
6781 #: build/C/man2/sigprocmask.2:113
6783 "It is not possible to block B<SIGKILL> or B<SIGSTOP>. Attempts to do so are "
6788 #: build/C/man2/sigprocmask.2:115
6789 msgid "Each of the threads in a process has its own signal mask."
6793 #: build/C/man2/sigprocmask.2:135
6795 "If B<SIGBUS>, B<SIGFPE>, B<SIGILL>, or B<SIGSEGV> are generated while they "
6796 "are blocked, the result is undefined, unless the signal was generated by "
6797 "B<kill>(2), B<sigqueue>(3), or B<raise>(3)."
6801 #: build/C/man2/sigprocmask.2:150
6803 "B<kill>(2), B<pause>(2), B<sigaction>(2), B<signal>(2), B<sigpending>(2), "
6804 "B<sigsuspend>(2), B<pthread_sigmask>(3), B<sigqueue>(3), B<sigsetops>(3), "
6809 #: build/C/man3/sigqueue.3:26
6815 #: build/C/man3/sigqueue.3:26
6821 #: build/C/man3/sigqueue.3:29
6822 msgid "sigqueue - queue a signal and data to a process"
6826 #: build/C/man3/sigqueue.3:33
6828 "B<int sigqueue(pid_t >I<pid>B<, int >I<sig>B<, const union sigval "
6833 #: build/C/man3/sigqueue.3:41
6834 msgid "B<sigqueue>(): _POSIX_C_SOURCE\\ E<gt>=\\ 199309L"
6838 #: build/C/man3/sigqueue.3:53
6840 "B<sigqueue>() sends the signal specified in I<sig> to the process whose PID "
6841 "is given in I<pid>. The permissions required to send a signal are the same "
6842 "as for B<kill>(2). As with B<kill>(2), the null signal (0) can be used to "
6843 "check if a process with a given PID exists."
6847 #: build/C/man3/sigqueue.3:58
6849 "The I<value> argument is used to specify an accompanying item of data "
6850 "(either an integer or a pointer value) to be sent with the signal, and has "
6851 "the following type:"
6855 #: build/C/man3/sigqueue.3:65
6860 " void *sival_ptr;\n"
6865 #: build/C/man3/sigqueue.3:81
6867 "If the receiving process has installed a handler for this signal using the "
6868 "B<SA_SIGINFO> flag to B<sigaction>(2), then it can obtain this data via the "
6869 "I<si_value> field of the I<siginfo_t> structure passed as the second "
6870 "argument to the handler. Furthermore, the I<si_code> field of that "
6871 "structure will be set to B<SI_QUEUE>."
6875 #: build/C/man3/sigqueue.3:89
6877 "On success, B<sigqueue>() returns 0, indicating that the signal was "
6878 "successfully queued to the receiving process. Otherwise -1 is returned and "
6879 "I<errno> is set to indicate the error."
6883 #: build/C/man3/sigqueue.3:100
6884 msgid "I<sig> was invalid."
6888 #: build/C/man3/sigqueue.3:106
6890 "The process does not have permission to send the signal to the receiving "
6891 "process. For the required permissions, see B<kill>(2)."
6895 #: build/C/man3/sigqueue.3:110
6896 msgid "No process has a PID matching I<pid>."
6900 #: build/C/man3/sigqueue.3:112
6901 msgid "This system call first appeared in Linux 2.2."
6905 #: build/C/man3/sigqueue.3:122
6907 "If this function results in the sending of a signal to the process that "
6908 "invoked it, and that signal was not blocked by the calling thread, and no "
6909 "other threads were willing to handle this signal (either by having it "
6910 "unblocked, or by waiting for it using B<sigwait>(3)), then at least some "
6911 "signal must be delivered to this thread before this function returns."
6915 #: build/C/man3/sigqueue.3:137
6917 "On Linux, this function is implemented using the B<rt_sigqueueinfo>(2) "
6918 "system call. The system call differs in its third argument, which is the "
6919 "I<siginfo_t> structure that will be supplied to the receiving process's "
6920 "signal handler or returned by the receiving process's B<sigtimedwait>(2) "
6921 "call. Inside the glibc B<sigqueue>() wrapper, this argument, I<uinfo>, is "
6922 "initialized as follows:"
6926 #: build/C/man3/sigqueue.3:145
6929 "uinfo.si_signo = sig; /* argument supplied to sigqueue() */\n"
6930 "uinfo.si_code = SI_QUEUE;\n"
6931 "uinfo.si_pid = getpid(); /* Process ID of sender */\n"
6932 "uinfo.si_uid = getuid(); /* Real UID of sender */\n"
6933 "uinfo.si_value = val; /* argument supplied to sigqueue() */\n"
6937 #: build/C/man3/sigqueue.3:155
6939 "B<kill>(2), B<rt_sigqueueinfo>(2), B<sigaction>(2), B<signal>(2), "
6940 "B<pthread_sigqueue>(3), B<sigwait>(3), B<signal>(7)"
6944 #: build/C/man2/sigreturn.2:27
6950 #: build/C/man2/sigreturn.2:27
6956 #: build/C/man2/sigreturn.2:30
6957 msgid "sigreturn - return from signal handler and cleanup stack frame"
6961 #: build/C/man2/sigreturn.2:32
6962 msgid "B<int sigreturn(unsigned long >I<__unused>B<);>"
6966 #: build/C/man2/sigreturn.2:40
6968 "When the Linux kernel creates the stack frame for a signal handler, a call "
6969 "to B<sigreturn>() is inserted into the stack frame so that upon return from "
6970 "the signal handler, B<sigreturn>() will be called."
6974 #: build/C/man2/sigreturn.2:51
6976 "This B<sigreturn>() call undoes everything that was done\\(emchanging the "
6977 "process's signal mask, switching stacks (see B<sigaltstack>(2))\\(emin order "
6978 "to invoke the signal handler: it restores the process's signal mask, "
6979 "switches stacks, and restores the process's context (registers, processor "
6980 "flags), so that the process directly resumes execution at the point where it "
6981 "was interrupted by the signal."
6985 #: build/C/man2/sigreturn.2:54
6986 msgid "B<sigreturn>() never returns."
6990 #: build/C/man2/sigreturn.2:54
6996 #: build/C/man2/sigreturn.2:56
6997 msgid "/usr/src/linux/arch/i386/kernel/signal.c"
7001 #: build/C/man2/sigreturn.2:58
7002 msgid "/usr/src/linux/arch/alpha/kernel/entry.S"
7006 #: build/C/man2/sigreturn.2:62
7008 "B<sigreturn>() is specific to Linux and should not be used in programs "
7009 "intended to be portable."
7013 #: build/C/man2/sigreturn.2:72
7015 "The B<sigreturn>() call is used by the kernel to implement signal "
7016 "handlers. It should B<never> be called directly. Better yet, the specific "
7017 "use of the I<__unused> argument varies depending on the architecture."
7021 #: build/C/man2/sigreturn.2:77
7022 msgid "B<kill>(2), B<sigaltstack>(2), B<signal>(2), B<signal>(7)"
7026 #: build/C/man3/sigset.3:24
7032 #: build/C/man3/sigset.3:27
7033 msgid "sigset, sighold, sigrelse, sigignore - System V signal API"
7037 #: build/C/man3/sigset.3:33
7038 msgid "B<sighandler_t sigset(int >I<sig>B<, sighandler_t >I<disp>B<);>"
7042 #: build/C/man3/sigset.3:35
7043 msgid "B<int sighold(int >I<sig>B<);>"
7047 #: build/C/man3/sigset.3:37
7048 msgid "B<int sigrelse(int >I<sig>B<);>"
7052 #: build/C/man3/sigset.3:39
7053 msgid "B<int sigignore(int >I<sig>B<);>"
7057 #: build/C/man3/sigset.3:50
7058 msgid "B<sigset>(), B<sighold>(), B<sigrelse>(), B<sigignore>():"
7062 #: build/C/man3/sigset.3:54
7063 msgid "_XOPEN_SOURCE\\ E<gt>=\\ 500 || _XOPEN_SOURCE\\ &&\\ _XOPEN_SOURCE_EXTENDED"
7067 #: build/C/man3/sigset.3:63
7069 "These functions are provided in glibc as a compatibility interface for "
7070 "programs that make use of the historical System V signal API. This API is "
7071 "obsolete: new applications should use the POSIX signal API (B<sigaction>(2), "
7072 "B<sigprocmask>(2), etc.)"
7076 #: build/C/man3/sigset.3:72
7078 "The B<sigset>() function modifies the disposition of the signal I<sig>. "
7079 "The I<disp> argument can be the address of a signal handler function, or one "
7080 "of the following constants:"
7084 #: build/C/man3/sigset.3:72
7090 #: build/C/man3/sigset.3:77
7091 msgid "Reset the disposition of I<sig> to the default."
7095 #: build/C/man3/sigset.3:77
7101 #: build/C/man3/sigset.3:81
7102 msgid "Ignore I<sig>."
7106 #: build/C/man3/sigset.3:81
7112 #: build/C/man3/sigset.3:88
7114 "Add I<sig> to the process's signal mask, but leave the disposition of I<sig> "
7119 #: build/C/man3/sigset.3:94
7121 "If I<disp> specifies the address of a signal handler, then I<sig> is added "
7122 "to the process's signal mask during execution of the handler."
7126 #: build/C/man3/sigset.3:102
7128 "If I<disp> was specified as a value other than B<SIG_HOLD>, then I<sig> is "
7129 "removed from the process's signal mask."
7133 #: build/C/man3/sigset.3:108 build/C/man3/sigvec.3:85
7134 msgid "The dispositions for B<SIGKILL> and B<SIGSTOP> cannot be changed."
7138 #: build/C/man3/sigset.3:114
7139 msgid "The B<sighold>() function adds I<sig> to the calling process's signal mask."
7143 #: build/C/man3/sigset.3:120
7145 "The B<sigrelse>() function removes I<sig> from the calling process's signal "
7150 #: build/C/man3/sigset.3:127
7151 msgid "The B<sigignore>() function sets the disposition of I<sig> to B<SIG_IGN>."
7155 #: build/C/man3/sigset.3:143
7157 "On success, B<sigset>() returns B<SIG_HOLD> if I<sig> was blocked before "
7158 "the call, or the signal's previous disposition if it was not blocked before "
7159 "the call. On error, B<sigset>() returns -1, with I<errno> set to indicate "
7160 "the error. (But see BUGS below.)"
7164 #: build/C/man3/sigset.3:152
7166 "The B<sighold>(), B<sigrelse>(), and B<sigignore>() functions return 0 on "
7167 "success; on error, these functions return -1 and set I<errno> to indicate "
7172 #: build/C/man3/sigset.3:159
7174 "For B<sigset>() see the ERRORS under B<sigaction>(2) and "
7175 "B<sigprocmask>(2)."
7179 #: build/C/man3/sigset.3:166
7180 msgid "For B<sighold>() and B<sigrelse>() see the ERRORS under B<sigprocmask>(2)."
7184 #: build/C/man3/sigset.3:171
7185 msgid "For B<sigignore>(), see the errors under B<sigaction>(2)."
7189 #: build/C/man3/sigset.3:188
7191 "SVr4, POSIX.1-2001. These functions are obsolete: do not use them in new "
7192 "programs. POSIX.1-2008 marks B<sighold>(), B<sigignore>(), B<sigpause>(), "
7193 "B<sigrelse>(), and B<sigset>() as obsolete, recommending the use of "
7194 "B<sigaction>(2), B<sigprocmask>(2), B<pthread_sigmask>(3), and "
7195 "B<sigsuspend>(2) instead."
7199 #: build/C/man3/sigset.3:190
7200 msgid "These functions appeared in glibc version 2.1."
7204 #: build/C/man3/sigset.3:196
7206 "The I<sighandler_t> type is a GNU extension; it is only used on this page to "
7207 "make the B<sigset>() prototype more easily readable."
7211 #: build/C/man3/sigset.3:204
7213 "The B<sigset>() function provides reliable signal handling semantics (as "
7214 "when calling B<sigaction>(2) with I<sa_mask> equal to 0)."
7218 #: build/C/man3/sigset.3:222
7220 "On System V, the B<signal>() function provides unreliable semantics (as "
7221 "when calling B<sigaction>(2) with I<sa_mask> equal to I<SA_RESETHAND | "
7222 "SA_NODEFER>). On BSD, B<signal>() provides reliable semantics. "
7223 "POSIX.1-2001 leaves these aspects of B<signal>() unspecified. See "
7224 "B<signal>(2) for further details."
7228 #: build/C/man3/sigset.3:230 build/C/man3/sigvec.3:250
7230 "In order to wait for a signal, BSD and System V both provided a function "
7231 "named B<sigpause>(3), but this function has a different argument on the two "
7232 "systems. See B<sigpause>(3) for details."
7236 #: build/C/man3/sigset.3:239
7238 "In versions of glibc before 2.2, B<sigset>() did not unblock I<sig> if "
7239 "I<disp> was specified as a value other than B<SIG_HOLD>."
7242 #. See http://sourceware.org/bugzilla/show_bug.cgi?id=1951
7244 #: build/C/man3/sigset.3:264
7246 "In versions of glibc before 2.5, B<sigset>() does not correctly return the "
7247 "previous disposition of the signal in two cases. First, if I<disp> is "
7248 "specified as B<SIG_HOLD>, then a successful B<sigset>() always returns "
7249 "B<SIG_HOLD>. Instead, it should return the previous disposition of the "
7250 "signal (unless the signal was blocked, in which case B<SIG_HOLD> should be "
7251 "returned). Second, if the signal is currently blocked, then the return "
7252 "value of a successful B<sigset>() should be B<SIG_HOLD>. Instead, the "
7253 "previous disposition of the signal is returned. These problems have been "
7254 "fixed since glibc 2.5."
7258 #: build/C/man3/sigset.3:274
7260 "B<kill>(2), B<pause>(2), B<sigaction>(2), B<signal>(2), B<sigprocmask>(2), "
7261 "B<raise>(3), B<sigpause>(3), B<sigvec>(3), B<signal>(7)"
7265 #: build/C/man3/sigsetops.3:29
7271 #: build/C/man3/sigsetops.3:29
7277 #: build/C/man3/sigsetops.3:33
7279 "sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - POSIX signal "
7284 #: build/C/man3/sigsetops.3:37
7285 msgid "B<int sigemptyset(sigset_t *>I<set>B<);>"
7289 #: build/C/man3/sigsetops.3:39
7290 msgid "B<int sigfillset(sigset_t *>I<set>B<);>"
7294 #: build/C/man3/sigsetops.3:41
7295 msgid "B<int sigaddset(sigset_t *>I<set>B<, int >I<signum>B<);>"
7299 #: build/C/man3/sigsetops.3:43
7300 msgid "B<int sigdelset(sigset_t *>I<set>B<, int >I<signum>B<);>"
7304 #: build/C/man3/sigsetops.3:45
7305 msgid "B<int sigismember(const sigset_t *>I<set>B<, int >I<signum>B<);>"
7309 #: build/C/man3/sigsetops.3:57
7311 "B<sigemptyset>(), B<sigfillset>(), B<sigaddset>(), B<sigdelset>(), "
7316 #: build/C/man3/sigsetops.3:59
7317 msgid "_POSIX_C_SOURCE\\ E<gt>=\\ 1 || _XOPEN_SOURCE || _POSIX_SOURCE"
7321 #: build/C/man3/sigsetops.3:63
7322 msgid "These functions allow the manipulation of POSIX signal sets."
7326 #: build/C/man3/sigsetops.3:68
7328 "B<sigemptyset>() initializes the signal set given by I<set> to empty, with "
7329 "all signals excluded from the set."
7333 #: build/C/man3/sigsetops.3:73
7334 msgid "B<sigfillset>() initializes I<set> to full, including all signals."
7338 #: build/C/man3/sigsetops.3:81
7340 "B<sigaddset>() and B<sigdelset>() add and delete respectively signal "
7341 "I<signum> from I<set>."
7345 #: build/C/man3/sigsetops.3:87
7346 msgid "B<sigismember>() tests whether I<signum> is a member of I<set>."
7350 #: build/C/man3/sigsetops.3:105
7352 "Objects of type I<sigset_t> must be initialized by a call to either "
7353 "B<sigemptyset>() or B<sigfillset>() before being passed to the functions "
7354 "B<sigaddset>(), B<sigdelset>() and B<sigismember>() or the additional "
7355 "glibc functions described below (B<sigisemptyset>(), B<sigandset>(), and "
7356 "B<sigorset>()). The results are undefined if this is not done."
7360 #: build/C/man3/sigsetops.3:112
7362 "B<sigemptyset>(), B<sigfillset>(), B<sigaddset>(), and B<sigdelset>() "
7363 "return 0 on success and -1 on error."
7367 #: build/C/man3/sigsetops.3:121
7369 "B<sigismember>() returns 1 if I<signum> is a member of I<set>, 0 if "
7370 "I<signum> is not a member, and -1 on error."
7374 #: build/C/man3/sigsetops.3:126
7375 msgid "I<sig> is not a valid signal."
7379 #: build/C/man3/sigsetops.3:129
7385 #: build/C/man3/sigsetops.3:135
7387 "If the B<_GNU_SOURCE> feature test macro is defined, then "
7388 "I<E<lt>signal.hE<gt>> exposes three other functions for manipulating signal "
7393 #: build/C/man3/sigsetops.3:135
7395 msgid "B<int sigisemptyset(sigset_t *>I<set>B<);>"
7399 #: build/C/man3/sigsetops.3:140
7400 msgid "returns 1 if I<set> contains no signals, and 0 otherwise."
7404 #: build/C/man3/sigsetops.3:140
7407 "B<int sigorset(sigset_t *>I<dest>B<, sigset_t *>I<left>B<, sigset_t "
7412 #: build/C/man3/sigsetops.3:149
7413 msgid "places the union of the sets I<left> and I<right> in I<dest>."
7417 #: build/C/man3/sigsetops.3:149
7420 "B<int sigandset(sigset_t *>I<dest>B<, sigset_t *>I<left>B<, sigset_t "
7425 #: build/C/man3/sigsetops.3:158
7426 msgid "places the intersection of the sets I<left> and I<right> in I<dest>."
7430 #: build/C/man3/sigsetops.3:163
7431 msgid "B<sigorset>() and B<sigandset>() return 0 on success, and -1 on failure."
7435 #: build/C/man3/sigsetops.3:166
7437 "These functions are nonstandard (a few other systems provide similar "
7438 "functions) and their use should be avoided in portable applications."
7442 #: build/C/man3/sigsetops.3:171
7443 msgid "B<sigaction>(2), B<sigpending>(2), B<sigprocmask>(2), B<sigsuspend>(2)"
7447 #: build/C/man2/sigsuspend.2:27
7453 #: build/C/man2/sigsuspend.2:27
7459 #: build/C/man2/sigsuspend.2:30
7460 msgid "sigsuspend - wait for a signal"
7464 #: build/C/man2/sigsuspend.2:34
7465 msgid "B<int sigsuspend(const sigset_t *>I<mask>B<);>"
7469 #: build/C/man2/sigsuspend.2:43
7471 "B<sigsuspend>(): _POSIX_C_SOURCE\\ E<gt>=\\ 1 || _XOPEN_SOURCE || "
7476 #: build/C/man2/sigsuspend.2:51
7478 "B<sigsuspend>() temporarily replaces the signal mask of the calling process "
7479 "with the mask given by I<mask> and then suspends the process until delivery "
7480 "of a signal whose action is to invoke a signal handler or to terminate a "
7485 #: build/C/man2/sigsuspend.2:60
7487 "If the signal terminates the process, then B<sigsuspend>() does not "
7488 "return. If the signal is caught, then B<sigsuspend>() returns after the "
7489 "signal handler returns, and the signal mask is restored to the state before "
7490 "the call to B<sigsuspend>()."
7494 #: build/C/man2/sigsuspend.2:68
7496 "It is not possible to block B<SIGKILL> or B<SIGSTOP>; specifying these "
7497 "signals in I<mask>, has no effect on the process's signal mask."
7501 #: build/C/man2/sigsuspend.2:72
7502 msgid "B<sigsuspend>() always returns -1, normally with the error B<EINTR>."
7506 #: build/C/man2/sigsuspend.2:77
7508 "I<mask> points to memory which is not a valid part of the process address "
7513 #: build/C/man2/sigsuspend.2:80
7514 msgid "The call was interrupted by a signal."
7518 #: build/C/man2/sigsuspend.2:100
7520 "Normally, B<sigsuspend>() is used in conjunction with B<sigprocmask>(2) in "
7521 "order to prevent delivery of a signal during the execution of a critical "
7522 "code section. The caller first blocks the signals with B<sigprocmask>(2). "
7523 "When the critical code has completed, the caller then waits for the signals "
7524 "by calling B<sigsuspend>() with the signal mask that was returned by "
7525 "B<sigprocmask>(2) (in the I<oldset> argument)."
7529 #: build/C/man2/sigsuspend.2:114
7531 "B<kill>(2), B<pause>(2), B<sigaction>(2), B<signal>(2), B<sigprocmask>(2), "
7532 "B<sigwaitinfo>(2), B<sigsetops>(3), B<sigwait>(3), B<signal>(7)"
7536 #: build/C/man3/sigvec.3:24
7542 #: build/C/man3/sigvec.3:27
7543 msgid "sigvec, sigblock, sigsetmask, siggetmask, sigmask - BSD signal API"
7547 #: build/C/man3/sigvec.3:31
7549 "B<int sigvec(int >I<sig>B<, struct sigvec *>I<vec>B<, struct sigvec "
7554 #: build/C/man3/sigvec.3:33
7555 msgid "B<int sigmask(int >I<signum>B<);>"
7559 #: build/C/man3/sigvec.3:35
7560 msgid "B<int sigblock(int >I<mask>B<);>"
7564 #: build/C/man3/sigvec.3:37
7565 msgid "B<int sigsetmask(int >I<mask>B<);>"
7569 #: build/C/man3/sigvec.3:39
7570 msgid "B<int siggetmask(void);>"
7574 #: build/C/man3/sigvec.3:47
7575 msgid "All functions shown above: _BSD_SOURCE"
7579 #: build/C/man3/sigvec.3:54
7581 "These functions are provided in glibc as a compatibility interface for "
7582 "programs that make use of the historical BSD signal API. This API is "
7583 "obsolete: new applications should use the POSIX signal API (B<sigaction>(2), "
7584 "B<sigprocmask>(2), etc.)"
7588 #: build/C/man3/sigvec.3:79
7590 "The B<sigvec>() function sets and/or gets the disposition of the signal "
7591 "I<sig> (like the POSIX B<sigaction>(2)). If I<vec> is not NULL, it points "
7592 "to a I<sigvec> structure that defines the new disposition for I<sig>. If "
7593 "I<ovec> is not NULL, it points to a I<sigvec> structure that is used to "
7594 "return the previous disposition of I<sig>. To obtain the current "
7595 "disposition of I<sig> without changing it, specify NULL for I<vec>, and a "
7596 "non-NULL pointer for I<ovec>."
7600 #: build/C/man3/sigvec.3:89
7601 msgid "The I<sigvec> structure has the following form:"
7605 #: build/C/man3/sigvec.3:97
7609 " void (*sv_handler)(); /* Signal disposition */\n"
7610 " int sv_mask; /* Signals to be blocked in handler */\n"
7611 " int sv_flags; /* Flags */\n"
7616 #: build/C/man3/sigvec.3:108
7618 "The I<sv_handler> field specifies the disposition of the signal, and is "
7619 "either: the address of a signal handler function; or B<SIG_DFL> meaning the "
7620 "default disposition applies for the signal; or B<SIG_IGN> meaning that the "
7621 "signal is ignored."
7625 #: build/C/man3/sigvec.3:122
7627 "If I<sv_handler> specifies the address of a signal handler, then I<sv_mask> "
7628 "specifies a mask of signals that are to be blocked while the handler is "
7629 "executing. In addition, the signal for which the handler is invoked is also "
7630 "blocked by default. Attempts to block B<SIGKILL> or B<SIGSTOP> are silently "
7635 #: build/C/man3/sigvec.3:129
7637 "If I<sv_handler> specifies the address of a signal handler, then the "
7638 "I<sv_flags> field specifies flags controlling what happens when the handler "
7639 "is called. This field may contain zero or more of the following flags:"
7643 #: build/C/man3/sigvec.3:129
7645 msgid "B<SV_INTERRUPT>"
7649 #: build/C/man3/sigvec.3:137
7651 "If the signal handler interrupts a blocking system call, then upon return "
7652 "from the handler the system call will not be restarted: instead it will fail "
7653 "with the error B<EINTR>. If this flag is not specified, then system calls "
7654 "are restarted by default."
7658 #: build/C/man3/sigvec.3:137
7660 msgid "B<SV_RESETHAND>"
7664 #: build/C/man3/sigvec.3:146
7666 "Reset the disposition of the signal to the default before calling the signal "
7667 "handler. If this flag is not specified, then the handler remains "
7668 "established until explicitly removed by a later call to B<sigvec>() or "
7669 "until the process performs an B<execve>(2)."
7673 #: build/C/man3/sigvec.3:146
7675 msgid "B<SV_ONSTACK>"
7679 #: build/C/man3/sigvec.3:153
7681 "Handle the signal on the alternate signal stack (historically established "
7682 "under BSD using the obsolete B<sigstack>() function; the POSIX replacement "
7683 "is B<sigaltstack>(2))."
7687 #: build/C/man3/sigvec.3:163
7689 "The B<sigmask>() function constructs and returns a \"signal mask\" for "
7690 "I<signum>. For example, we can initialize the I<vec.sv_mask> field given to "
7691 "B<sigvec>() using code such as the following:"
7695 #: build/C/man3/sigvec.3:168
7698 " vec.sv_mask = sigmask(SIGQUIT) | sigpause(SIGABRT);\n"
7699 " /* Block SIGQUIT and SIGABRT during\n"
7700 " handler execution */\n"
7704 #: build/C/man3/sigvec.3:183
7706 "The B<sigblock>() function adds the signals in I<mask> to the process's "
7707 "signal mask (like POSIX I<sigprocmask(SIG_BLOCK)>), and returns the "
7708 "process's previous signal mask. Attempts to block B<SIGKILL> or B<SIGSTOP> "
7709 "are silently ignored."
7713 #: build/C/man3/sigvec.3:191
7715 "The B<sigsetmask>() function sets the process's signal mask to the value "
7716 "given in I<mask> (like POSIX I<sigprocmask(SIG_SETMASK)>), and returns the "
7717 "process's previous signal mask."
7721 #: build/C/man3/sigvec.3:197
7723 "The B<siggetmask>() function returns the process's current signal mask. "
7724 "This call is equivalent to I<sigblock(0)>."
7728 #: build/C/man3/sigvec.3:203
7730 "The B<sigvec>() function returns 0 on success; on error, it returns -1 and "
7731 "sets I<errno> to indicate the error."
7735 #: build/C/man3/sigvec.3:209
7737 "The B<sigblock>() and B<sigsetmask>() functions return the previous signal "
7742 #: build/C/man3/sigvec.3:214
7743 msgid "The B<sigmask>() function returns the signal mask for I<signum>."
7747 #: build/C/man3/sigvec.3:219
7748 msgid "See the ERRORS under B<sigaction>(2) and B<sigprocmask>(2)."
7752 #: build/C/man3/sigvec.3:225
7754 "All of these functions were in 4.3BSD, except B<siggetmask>(), whose origin "
7755 "is unclear. These functions are obsolete: do not use them in new programs."
7759 #: build/C/man3/sigvec.3:242
7761 "On 4.3BSD, the B<signal>() function provided reliable semantics (as when "
7762 "calling B<sigvec>() with I<vec.sv_mask> equal to 0). On System V, "
7763 "B<signal>() provides unreliable semantics. POSIX.1-2001 leaves these "
7764 "aspects of B<signal>() unspecified. See B<signal>(2) for further details."
7768 #: build/C/man3/sigvec.3:260
7770 "B<kill>(2), B<pause>(2), B<sigaction>(2), B<signal>(2), B<sigprocmask>(2), "
7771 "B<raise>(3), B<sigpause>(3), B<sigset>(3), B<signal>(7)"
7775 #: build/C/man3/sigwait.3:24
7781 #: build/C/man3/sigwait.3:24
7787 #: build/C/man3/sigwait.3:27
7788 msgid "sigwait - wait for a signal"
7792 #: build/C/man3/sigwait.3:32
7794 msgid "B< int sigwait(const sigset_t *>I<set>B<, int *>I<sig>B<);>\n"
7798 #: build/C/man3/sigwait.3:42
7799 msgid "B<sigwait>(): _POSIX_C_SOURCE\\ E<gt>=\\ 1 || _XOPEN_SOURCE || _POSIX_SOURCE"
7803 #: build/C/man3/sigwait.3:53
7805 "The B<sigwait>() function suspends execution of the calling thread until "
7806 "the delivery of one of the signals specified in the signal set I<set>. The "
7807 "function accepts the signal (removes it from the pending list of signals), "
7808 "and returns the signal number in I<sig>."
7812 #: build/C/man3/sigwait.3:59
7814 "The operation of B<sigwait>() is the same as B<sigwaitinfo>(2), except "
7819 #: build/C/man3/sigwait.3:64
7821 "B<sigwait>() only returns the signal number, rather than a I<siginfo_t> "
7822 "structure describing the signal."
7826 #: build/C/man3/sigwait.3:66
7827 msgid "The return values of the two functions are different."
7831 #: build/C/man3/sigwait.3:71
7833 "On success, B<sigwait>() returns 0. On error, it returns a positive error "
7834 "number (listed in ERRORS)."
7837 #. Does not occur for glibc.
7839 #: build/C/man3/sigwait.3:77
7840 msgid "I<set> contains an invalid signal number."
7844 #: build/C/man3/sigwait.3:83
7845 msgid "B<sigwait>() is implemented using B<sigtimedwait>(2)."
7849 #: build/C/man3/sigwait.3:86
7850 msgid "See B<pthread_sigmask>(3)."
7854 #: build/C/man3/sigwait.3:94
7856 "B<sigaction>(2), B<signalfd>(2), B<sigpending>(2), B<sigsuspend>(2), "
7857 "B<sigwaitinfo>(2), B<sigsetops>(3), B<signal>(7)"
7861 #: build/C/man2/sigwaitinfo.2:23
7867 #: build/C/man2/sigwaitinfo.2:23
7873 #: build/C/man2/sigwaitinfo.2:26
7874 msgid "sigwaitinfo, sigtimedwait - synchronously wait for queued signals"
7878 #: build/C/man2/sigwaitinfo.2:31
7880 msgid "B<int sigwaitinfo(const sigset_t *>I<set>B<, siginfo_t *>I<info>B<);>\n"
7884 #: build/C/man2/sigwaitinfo.2:34
7887 "B<int sigtimedwait(const sigset_t *>I<set>B<, siginfo_t *>I<info>B<, >\n"
7888 "B< const struct timespec *>I<timeout>B<);>\n"
7892 #: build/C/man2/sigwaitinfo.2:44
7893 msgid "B<sigwaitinfo>(), B<sigtimedwait>(): _POSIX_C_SOURCE\\ E<gt>=\\ 199309L"
7897 #: build/C/man2/sigwaitinfo.2:54
7899 "B<sigwaitinfo>() suspends execution of the calling thread until one of the "
7900 "signals in I<set> is delivered. (If one of the signals in I<set> is already "
7901 "pending for the calling thread, B<sigwaitinfo>() will return immediately "
7902 "with information about that signal.)"
7906 #: build/C/man2/sigwaitinfo.2:66
7908 "B<sigwaitinfo>() removes the delivered signal from the set of pending "
7909 "signals and returns the signal number as its function result. If the "
7910 "I<info> argument is not NULL, then it returns a structure of type "
7911 "I<siginfo_t> (see B<sigaction>(2)) containing information about the signal."
7915 #: build/C/man2/sigwaitinfo.2:72
7917 "Signals returned via B<sigwaitinfo>() are delivered in the usual order; see "
7918 "B<signal>(7) for further details."
7922 #: build/C/man2/sigwaitinfo.2:84
7924 "B<sigtimedwait>() operates in exactly the same way as B<sigwaitinfo>() "
7925 "except that it has an additional argument, I<timeout>, which specifies a "
7926 "minimum interval for which the thread is suspended waiting for a signal. "
7927 "(This interval will be rounded up to the system clock granularity, and "
7928 "kernel scheduling delays mean that the interval may overrun by a small "
7929 "amount.) This argument is of the following type:"
7933 #: build/C/man2/sigwaitinfo.2:91
7936 "struct timespec {\n"
7937 " long tv_sec; /* seconds */\n"
7938 " long tv_nsec; /* nanoseconds */\n"
7943 #: build/C/man2/sigwaitinfo.2:101
7945 "If both fields of this structure are specified as 0, a poll is performed: "
7946 "B<sigtimedwait>() returns immediately, either with information about a "
7947 "signal that was pending for the caller, or with an error if none of the "
7948 "signals in I<set> was pending."
7952 #: build/C/man2/sigwaitinfo.2:110
7954 "On success, both B<sigwaitinfo>() and B<sigtimedwait>() return a signal "
7955 "number (i.e., a value greater than zero). On failure both calls return -1, "
7956 "with I<errno> set to indicate the error."
7960 #: build/C/man2/sigwaitinfo.2:119
7962 "No signal in I<set> was delivered within the I<timeout> period specified to "
7963 "B<sigtimedwait>()."
7967 #: build/C/man2/sigwaitinfo.2:125
7969 "The wait was interrupted by a signal handler; see B<signal>(7). (This "
7970 "handler was for a signal other than one of those in I<set>.)"
7974 #: build/C/man2/sigwaitinfo.2:129
7975 msgid "I<timeout> was invalid."
7979 #: build/C/man2/sigwaitinfo.2:148
7981 "In normal usage, the calling program blocks the signals in I<set> via a "
7982 "prior call to B<sigprocmask>(2) (so that the default disposition for these "
7983 "signals does not occur if they are delivered between successive calls to "
7984 "B<sigwaitinfo>() or B<sigtimedwait>()) and does not establish handlers for "
7985 "these signals. In a multithreaded program, the signal should be blocked in "
7986 "all threads to prevent the signal being delivered to a thread other than the "
7987 "one calling B<sigwaitinfo>() or B<sigtimedwait>())."
7991 #: build/C/man2/sigwaitinfo.2:153
7993 "The set of signals that is pending for a given thread is the union of the "
7994 "set of signals that is pending specifically for that thread and the set of "
7995 "signals that is pending for the process as a whole (see B<signal>(7))."
7999 #: build/C/man2/sigwaitinfo.2:159
8000 msgid "Attempts to wait for B<SIGKILL> and B<SIGSTOP> are silently ignored."
8004 #: build/C/man2/sigwaitinfo.2:168
8006 "If multiple threads of a process are blocked waiting for the same signal(s) "
8007 "in B<sigwaitinfo>() or B<sigtimedwait>(), then exactly one of the threads "
8008 "will actually receive the signal if it is delivered to the process as a "
8009 "whole; which of the threads receives the signal is indeterminate."
8013 #: build/C/man2/sigwaitinfo.2:177
8015 "POSIX leaves the meaning of a NULL value for the I<timeout> argument of "
8016 "B<sigtimedwait>() unspecified, permitting the possibility that this has the "
8017 "same meaning as a call to B<sigwaitinfo>(), and indeed this is what is done "
8022 #: build/C/man2/sigwaitinfo.2:182
8024 "On Linux, B<sigwaitinfo>() is a library function implemented on top of "
8025 "B<sigtimedwait>()."
8029 #: build/C/man2/sigwaitinfo.2:194
8031 "B<kill>(2), B<sigaction>(2), B<signal>(2), B<signalfd>(2), B<sigpending>(2), "
8032 "B<sigprocmask>(2), B<sigqueue>(3), B<sigsetops>(3), B<sigwait>(3), "
8033 "B<signal>(7), B<time>(7)"
8037 #: build/C/man3/sysv_signal.3:23
8043 #: build/C/man3/sysv_signal.3:23
8049 #: build/C/man3/sysv_signal.3:26
8050 msgid "sysv_signal - signal handling with System V semantics"
8054 #: build/C/man3/sysv_signal.3:28
8055 msgid "B<#define _GNU_SOURCE> /* See feature_test_macros(7) */"
8059 #: build/C/man3/sysv_signal.3:34
8060 msgid "B<sighandler_t sysv_signal(int >I<signum>B<, sighandler_t >I<handler>B<);>"
8064 #: build/C/man3/sysv_signal.3:39
8066 "The B<sysv_signal>() function takes the same arguments, and performs the "
8067 "same task, as B<signal>(2)."
8071 #: build/C/man3/sysv_signal.3:49
8073 "However B<sysv_signal>() provides the System V unreliable signal semantics, "
8074 "that is: a) the disposition of the signal is reset to the default when the "
8075 "handler is invoked; b) delivery of further instances of the signal is not "
8076 "blocked while the signal handler is executing; and c) if the handler "
8077 "interrupts (certain) blocking system calls, then the system call is not "
8078 "automatically restarted."
8082 #: build/C/man3/sysv_signal.3:55
8084 "The B<sysv_signal>() function returns the previous value of the signal "
8085 "handler, or B<SIG_ERR> on error."
8089 #: build/C/man3/sysv_signal.3:60
8090 msgid "This function is nonstandard."
8094 #: build/C/man3/sysv_signal.3:66
8095 msgid "Use of B<sysv_signal>() should be avoided; use B<sigaction>(2) instead."
8099 #: build/C/man3/sysv_signal.3:77
8101 "On older Linux systems, B<sysv_signal>() and B<signal>(2) were "
8102 "equivalent. But on newer systems, B<signal>(2) provides reliable signal "
8103 "semantics; see B<signal>(2) for details."
8107 #: build/C/man3/sysv_signal.3:90
8108 msgid "B<sigaction>(2), B<signal>(2), B<bsd_signal>(3), B<signal>(7)"
8112 #: build/C/man2/timer_create.2:29
8114 msgid "TIMER_CREATE"
8118 #: build/C/man2/timer_create.2:29
8124 #: build/C/man2/timer_create.2:32
8125 msgid "timer_create - create a POSIX per-process timer"
8129 #: build/C/man2/timer_create.2:36
8132 "B<#include E<lt>signal.hE<gt>>\n"
8133 "B<#include E<lt>time.hE<gt>>\n"
8137 #: build/C/man2/timer_create.2:39
8140 "B<int timer_create(clockid_t >I<clockid>B<, struct sigevent *>I<sevp>B<,>\n"
8141 "B< timer_t *>I<timerid>B<);>\n"
8145 #: build/C/man2/timer_create.2:42 build/C/man2/timer_delete.2:34 build/C/man2/timer_getoverrun.2:34 build/C/man2/timer_settime.2:38
8146 msgid "Link with I<-lrt>."
8150 #: build/C/man2/timer_create.2:50
8151 msgid "B<timer_create>(): _POSIX_C_SOURCE\\ E<gt>=\\ 199309L"
8155 #: build/C/man2/timer_create.2:58
8157 "B<timer_create>() creates a new per-process interval timer. The ID of the "
8158 "new timer is returned in the buffer pointed to by I<timerid>, which must be "
8159 "a non-NULL pointer. This ID is unique within the process, until the timer "
8160 "is deleted. The new timer is initially disarmed."
8164 #: build/C/man2/timer_create.2:63
8166 "The I<clockid> argument specifies the clock that the new timer uses to "
8167 "measure time. It can be specified as one of the following values:"
8171 #: build/C/man2/timer_create.2:63
8173 msgid "B<CLOCK_REALTIME>"
8177 #: build/C/man2/timer_create.2:66
8178 msgid "A settable system-wide real-time clock."
8182 #: build/C/man2/timer_create.2:66
8184 msgid "B<CLOCK_MONOTONIC>"
8187 #. Note: the CLOCK_MONOTONIC_RAW clock added for clock_gettime()
8188 #. in 2.6.28 is not supported for POSIX timers -- mtk, Feb 2009
8190 #: build/C/man2/timer_create.2:73
8192 "A nonsettable monotonically increasing clock that measures time from some "
8193 "unspecified point in the past that does not change after system startup."
8197 #: build/C/man2/timer_create.2:73
8199 msgid "B<CLOCK_PROCESS_CPUTIME_ID> (since Linux 2.6.12)"
8203 #: build/C/man2/timer_create.2:77
8205 "A clock that measures (user and system) CPU time consumed by (all of the "
8206 "threads in) the calling process."
8210 #: build/C/man2/timer_create.2:77
8212 msgid "B<CLOCK_THREAD_CPUTIME_ID> (since Linux 2.6.12)"
8215 #. The CLOCK_MONOTONIC_RAW that was added in 2.6.28 can't be used
8216 #. to create a timer -- mtk, Feb 2009
8218 #: build/C/man2/timer_create.2:83
8220 "A clock that measures (user and system) CPU time consumed by the calling "
8225 #: build/C/man2/timer_create.2:92
8227 "As well as the above values, I<clockid> can be specified as the I<clockid> "
8228 "returned by a call to B<clock_getcpuclockid>(3) or "
8229 "B<pthread_getcpuclockid>(3)."
8233 #: build/C/man2/timer_create.2:101
8235 "The I<sevp> argument points to a I<sigevent> structure that specifies how "
8236 "the caller should be notified when the timer expires. For the definition "
8237 "and general details of this structure, see B<sigevent>(7)."
8241 #: build/C/man2/timer_create.2:105
8242 msgid "The I<sevp.sigev_notify> field can have the following values:"
8246 #: build/C/man2/timer_create.2:110
8248 "Don't asynchronously notify when the timer expires. Progress of the timer "
8249 "can be monitored using B<timer_gettime>(2)."
8253 #: build/C/man2/timer_create.2:128
8255 "Upon timer expiration, generate the signal I<sigev_signo> for the process. "
8256 "See B<sigevent>(7) for general details. The I<si_code> field of the "
8257 "I<siginfo_t> structure will be set to B<SI_TIMER>. At any point in time, at "
8258 "most one signal is queued to the process for a given timer; see "
8259 "B<timer_getoverrun>(2) for more details."
8263 #: build/C/man2/timer_create.2:136
8265 "Upon timer expiration, invoke I<sigev_notify_function> as if it were the "
8266 "start function of a new thread. See B<sigevent>(7) for details."
8270 #: build/C/man2/timer_create.2:150
8272 "As for B<SIGEV_SIGNAL>, but the signal is targeted at the thread whose ID is "
8273 "given in I<sigev_notify_thread_id>, which must be a thread in the same "
8274 "process as the caller. The I<sigev_notify_thread_id> field specifies a "
8275 "kernel thread ID, that is, the value returned by B<clone>(2) or "
8276 "B<gettid>(2). This flag is only intended for use by threading libraries."
8280 #: build/C/man2/timer_create.2:165
8282 "Specifying I<sevp> as NULL is equivalent to specifying a pointer to a "
8283 "I<sigevent> structure in which I<sigev_notify> is B<SIGEV_SIGNAL>, "
8284 "I<sigev_signo> is B<SIGALRM>, and I<sigev_value.sival_int> is the timer ID."
8288 #: build/C/man2/timer_create.2:173
8290 "On success, B<timer_create>() returns 0, and the ID of the new timer is "
8291 "placed in I<*timerid>. On failure, -1 is returned, and I<errno> is set to "
8292 "indicate the error."
8296 #: build/C/man2/timer_create.2:177
8297 msgid "Temporary error during kernel allocation of timer structures."
8301 #: build/C/man2/timer_create.2:185
8303 "Clock ID, I<sigev_notify>, I<sigev_signo>, or I<sigev_notify_thread_id> is "
8307 #. glibc layer: malloc()
8309 #: build/C/man2/timer_create.2:189
8310 msgid "Could not allocate memory."
8314 #: build/C/man2/timer_create.2:191 build/C/man2/timer_delete.2:64 build/C/man2/timer_getoverrun.2:94
8315 msgid "This system call is available since Linux 2.6."
8319 #: build/C/man2/timer_create.2:196
8320 msgid "A program may create multiple interval timers using B<timer_create>()."
8324 #: build/C/man2/timer_create.2:201
8326 "Timers are not inherited by the child of a B<fork>(2), and are disarmed and "
8327 "deleted during an B<execve>(2)."
8331 #: build/C/man2/timer_create.2:209
8333 "The kernel preallocates a \"queued real-time signal\" for each timer created "
8334 "using B<timer_create>(). Consequently, the number of timers is limited by "
8335 "the B<RLIMIT_SIGPENDING> resource limit (see B<setrlimit>(2))."
8339 #: build/C/man2/timer_create.2:214
8341 "The timers created by B<timer_create>() are commonly known as \"POSIX "
8342 "(interval) timers\". The POSIX timers API consists of the following "
8347 #: build/C/man2/timer_create.2:217
8348 msgid "B<timer_create>(): Create a timer."
8352 #: build/C/man2/timer_create.2:220
8353 msgid "B<timer_settime>(2): Arm (start) or disarm (stop) a timer."
8357 #: build/C/man2/timer_create.2:224
8359 "B<timer_gettime>(2): Fetch the time remaining until the next expiration of a "
8360 "timer, along with the interval setting of the timer."
8364 #: build/C/man2/timer_create.2:227
8366 "B<timer_getoverrun>(2): Return the overrun count for the last timer "
8371 #: build/C/man2/timer_create.2:230
8372 msgid "B<timer_delete>(2): Disarm and delete a timer."
8376 #: build/C/man2/timer_create.2:233
8378 "Part of the implementation of the POSIX timers API is provided by glibc. In "
8383 #: build/C/man2/timer_create.2:237
8385 "The functionality for B<SIGEV_THREAD> is implemented within glibc, rather "
8389 #. See the glibc source file kernel-posix-timers.h for the structure
8390 #. that glibc uses to map userspace timer IDs to kernel timer IDs
8391 #. The kernel-level timer ID is exposed via siginfo.si_tid.
8393 #: build/C/man2/timer_create.2:243
8395 "The timer IDs presented at user level are maintained by glibc, which maps "
8396 "these IDs to the timer IDs employed by the kernel."
8400 #: build/C/man2/timer_create.2:251
8402 "The POSIX timers system calls first appeared in Linux 2.6. Prior to this, "
8403 "glibc provided an incomplete userspace implementation (B<CLOCK_REALTIME> "
8404 "timers only) using POSIX threads, and current glibc falls back to this "
8405 "implementation on systems running pre-2.6 Linux kernels."
8409 #: build/C/man2/timer_create.2:263
8411 "The program below takes two arguments: a sleep period in seconds, and a "
8412 "timer frequency in nanoseconds. The program establishes a handler for the "
8413 "signal it uses for the timer, blocks that signal, creates and arms a timer "
8414 "that expires with the given frequency, sleeps for the specified number of "
8415 "seconds, and then unblocks the timer signal. Assuming that the timer "
8416 "expired at least once while the program slept, the signal handler will be "
8417 "invoked, and the handler displays some information about the timer "
8418 "notification. The program terminates after one invocation of the signal "
8423 #: build/C/man2/timer_create.2:268
8425 "In the following example run, the program sleeps for 1 second, after "
8426 "creating a timer that has a frequency of 100 nanoseconds. By the time the "
8427 "signal is unblocked and delivered, there have been around ten million "
8432 #: build/C/man2/timer_create.2:280
8435 "$ B<./a.out 1 100>\n"
8436 "Establishing handler for signal 34\n"
8437 "Blocking signal 34\n"
8438 "timer ID is 0x804c008\n"
8439 "Sleeping for 1 seconds\n"
8440 "Unblocking signal 34\n"
8441 "Caught signal 34\n"
8442 " sival_ptr = 0xbfb174f4; *sival_ptr = 0x804c008\n"
8443 " overrun count = 10004886\n"
8447 #: build/C/man2/timer_create.2:282
8449 msgid "Program Source"
8453 #: build/C/man2/timer_create.2:290
8456 "#include E<lt>stdlib.hE<gt>\n"
8457 "#include E<lt>unistd.hE<gt>\n"
8458 "#include E<lt>stdio.hE<gt>\n"
8459 "#include E<lt>signal.hE<gt>\n"
8460 "#include E<lt>time.hE<gt>\n"
8464 #: build/C/man2/timer_create.2:293
8467 "#define CLOCKID CLOCK_REALTIME\n"
8468 "#define SIG SIGRTMIN\n"
8472 #: build/C/man2/timer_create.2:296
8475 "#define errExit(msg) do { perror(msg); exit(EXIT_FAILURE); \\e\n"
8480 #: build/C/man2/timer_create.2:302
8484 "print_siginfo(siginfo_t *si)\n"
8491 #: build/C/man2/timer_create.2:304
8493 msgid " tidp = si-E<gt>si_value.sival_ptr;\n"
8497 #: build/C/man2/timer_create.2:307
8500 " printf(\" sival_ptr = %p; \", si-E<gt>si_value.sival_ptr);\n"
8501 " printf(\" *sival_ptr = 0x%lx\\en\", (long) *tidp);\n"
8505 #: build/C/man2/timer_create.2:314
8508 " or = timer_getoverrun(*tidp);\n"
8510 " errExit(\"timer_getoverrun\");\n"
8512 " printf(\" overrun count = %d\\en\", or);\n"
8517 #: build/C/man2/timer_create.2:321
8521 "handler(int sig, siginfo_t *si, void *uc)\n"
8523 " /* Note: calling printf() from a signal handler is not\n"
8524 " strictly correct, since printf() is not async-signal-safe;\n"
8525 " see signal(7) */\n"
8529 #: build/C/man2/timer_create.2:326
8532 " printf(\"Caught signal %d\\en\", sig);\n"
8533 " print_siginfo(si);\n"
8534 " signal(sig, SIG_IGN);\n"
8539 #: build/C/man2/timer_create.2:336
8543 "main(int argc, char *argv[])\n"
8545 " timer_t timerid;\n"
8546 " struct sigevent sev;\n"
8547 " struct itimerspec its;\n"
8548 " long long freq_nanosecs;\n"
8550 " struct sigaction sa;\n"
8554 #: build/C/man2/timer_create.2:342
8557 " if (argc != 3) {\n"
8558 " fprintf(stderr, \"Usage: %s E<lt>sleep-secsE<gt> "
8559 "E<lt>freq-nanosecsE<gt>\\en\",\n"
8561 " exit(EXIT_FAILURE);\n"
8566 #: build/C/man2/timer_create.2:344
8568 msgid " /* Establish handler for timer signal */\n"
8572 #: build/C/man2/timer_create.2:351
8575 " printf(\"Establishing handler for signal %d\\en\", SIG);\n"
8576 " sa.sa_flags = SA_SIGINFO;\n"
8577 " sa.sa_sigaction = handler;\n"
8578 " sigemptyset(&sa.sa_mask);\n"
8579 " if (sigaction(SIG, &sa, NULL) == -1)\n"
8580 " errExit(\"sigaction\");\n"
8584 #: build/C/man2/timer_create.2:353
8586 msgid " /* Block timer signal temporarily */\n"
8590 #: build/C/man2/timer_create.2:359
8593 " printf(\"Blocking signal %d\\en\", SIG);\n"
8594 " sigemptyset(&mask);\n"
8595 " sigaddset(&mask, SIG);\n"
8596 " if (sigprocmask(SIG_SETMASK, &mask, NULL) == -1)\n"
8597 " errExit(\"sigprocmask\");\n"
8601 #: build/C/man2/timer_create.2:361
8603 msgid " /* Create the timer */\n"
8607 #: build/C/man2/timer_create.2:367
8610 " sev.sigev_notify = SIGEV_SIGNAL;\n"
8611 " sev.sigev_signo = SIG;\n"
8612 " sev.sigev_value.sival_ptr = &timerid;\n"
8613 " if (timer_create(CLOCKID, &sev, &timerid) == -1)\n"
8614 " errExit(\"timer_create\");\n"
8618 #: build/C/man2/timer_create.2:369
8620 msgid " printf(\"timer ID is 0x%lx\\en\", (long) timerid);\n"
8624 #: build/C/man2/timer_create.2:371
8626 msgid " /* Start the timer */\n"
8630 #: build/C/man2/timer_create.2:377
8633 " freq_nanosecs = atoll(argv[2]);\n"
8634 " its.it_value.tv_sec = freq_nanosecs / 1000000000;\n"
8635 " its.it_value.tv_nsec = freq_nanosecs % 1000000000;\n"
8636 " its.it_interval.tv_sec = its.it_value.tv_sec;\n"
8637 " its.it_interval.tv_nsec = its.it_value.tv_nsec;\n"
8641 #: build/C/man2/timer_create.2:380
8644 " if (timer_settime(timerid, 0, &its, NULL) == -1)\n"
8645 " errExit(\"timer_settime\");\n"
8649 #: build/C/man2/timer_create.2:383
8652 " /* Sleep for a while; meanwhile, the timer may expire\n"
8653 " multiple times */\n"
8657 #: build/C/man2/timer_create.2:386
8660 " printf(\"Sleeping for %d seconds\\en\", atoi(argv[1]));\n"
8661 " sleep(atoi(argv[1]));\n"
8665 #: build/C/man2/timer_create.2:389
8668 " /* Unlock the timer signal, so that timer notification\n"
8669 " can be delivered */\n"
8673 #: build/C/man2/timer_create.2:393
8676 " printf(\"Unblocking signal %d\\en\", SIG);\n"
8677 " if (sigprocmask(SIG_UNBLOCK, &mask, NULL) == -1)\n"
8678 " errExit(\"sigprocmask\");\n"
8682 #: build/C/man2/timer_create.2:396 build/C/man2/timerfd_create.2:533
8685 " exit(EXIT_SUCCESS);\n"
8690 #: build/C/man2/timer_create.2:410
8692 "B<clock_gettime>(2), B<setitimer>(2), B<timer_delete>(2), "
8693 "B<timer_getoverrun>(2), B<timer_settime>(2), B<timerfd_create>(2), "
8694 "B<clock_getcpuclockid>(3), B<pthread_getcpuclockid>(3), B<pthreads>(7), "
8695 "B<sigevent>(7), B<signal>(7), B<time>(7)"
8699 #: build/C/man2/timer_delete.2:23
8701 msgid "TIMER_DELETE"
8705 #: build/C/man2/timer_delete.2:23 build/C/man2/timer_getoverrun.2:23 build/C/man2/timer_settime.2:23
8711 #: build/C/man2/timer_delete.2:26
8712 msgid "timer_delete - delete a POSIX per-process timer"
8716 #: build/C/man2/timer_delete.2:29 build/C/man2/timer_getoverrun.2:29 build/C/man2/timer_settime.2:30
8718 msgid "B<#include E<lt>time.hE<gt>>\n"
8722 #: build/C/man2/timer_delete.2:31
8724 msgid "B<int timer_delete(timer_t >I<timerid>B<);>\n"
8728 #: build/C/man2/timer_delete.2:42
8729 msgid "B<timer_delete>(): _POSIX_C_SOURCE\\ E<gt>=\\ 199309L"
8733 #: build/C/man2/timer_delete.2:50
8735 "B<timer_delete>() deletes the timer whose ID is given in I<timerid>. If "
8736 "the timer was armed at the time of this call, it is disarmed before being "
8737 "deleted. The treatment of any pending signal generated by the deleted timer "
8742 #: build/C/man2/timer_delete.2:57
8744 "On success, B<timer_delete>() returns 0. On failure, -1 is returned, and "
8745 "I<errno> is set to indicate the error."
8749 #: build/C/man2/timer_delete.2:62 build/C/man2/timer_getoverrun.2:92
8750 msgid "I<timerid> is not a valid timer ID."
8754 #: build/C/man2/timer_delete.2:72
8756 "B<clock_gettime>(2), B<timer_create>(2), B<timer_getoverrun>(2), "
8757 "B<timer_settime>(2), B<time>(7)"
8761 #: build/C/man2/timer_getoverrun.2:23
8763 msgid "TIMER_GETOVERRUN"
8767 #: build/C/man2/timer_getoverrun.2:26
8768 msgid "timer_getoverrun - get overrun count for a POSIX per-process timer"
8772 #: build/C/man2/timer_getoverrun.2:31
8774 msgid "B<int timer_getoverrun(timer_t >I<timerid>B<);>\n"
8778 #: build/C/man2/timer_getoverrun.2:42
8779 msgid "B<timer_getoverrun>(): _POSIX_C_SOURCE\\ E<gt>=\\ 199309L"
8783 #: build/C/man2/timer_getoverrun.2:53
8785 "B<timer_getoverrun>() returns the \"overrun count\" for the timer referred "
8786 "to by I<timerid>. An application can use the overrun count to accurately "
8787 "calculate the number of timer expirations that would have occurred over a "
8788 "given time interval. Timer overruns can occur both when receiving "
8789 "expiration notifications via signals (B<SIGEV_SIGNAL>), and via threads "
8790 "(B<SIGEV_THREAD>)."
8794 #: build/C/man2/timer_getoverrun.2:73
8796 "When expiration notifications are delivered via a signal, overruns can occur "
8797 "as follows. Regardless of whether or not a real-time signal is used for "
8798 "timer notifications, the system queues at most one signal per timer. (This "
8799 "is the behavior specified by POSIX.1-2001. The alternative, queuing one "
8800 "signal for each timer expiration, could easily result in overflowing the "
8801 "allowed limits for queued signals on the system.) Because of system "
8802 "scheduling delays, or because the signal may be temporarily blocked, there "
8803 "can be a delay between the time when the notification signal is generated "
8804 "and the time when it is delivered (e.g., caught by a signal handler) or "
8805 "accepted (e.g., using B<sigwaitinfo>(2)). In this interval, further timer "
8806 "expirations may occur. The timer overrun count is the number of additional "
8807 "timer expirations that occurred between the time when the signal was "
8808 "generated and when it was delivered or accepted."
8812 #: build/C/man2/timer_getoverrun.2:79
8814 "Timer overruns can also occur when expiration notifications are delivered "
8815 "via invocation of a thread, since there may be an arbitrary delay between an "
8816 "expiration of the timer and the invocation of the notification thread, and "
8817 "in that delay interval, additional timer expirations may occur"
8821 #: build/C/man2/timer_getoverrun.2:87
8823 "On success, B<timer_getoverrun>() returns the overrun count of the "
8824 "specified timer; this count may be 0 if no overruns have occurred. On "
8825 "failure, -1 is returned, and I<errno> is set to indicate the error."
8829 #: build/C/man2/timer_getoverrun.2:108
8831 "When timer notifications are delivered via signals (B<SIGEV_SIGNAL>), on "
8832 "Linux it is also possible to obtain the overrun count via the I<si_overrun> "
8833 "field of the I<siginfo_t> structure (see B<sigaction>(2)). This allows an "
8834 "application to avoid the overhead of making a system call to obtain the "
8835 "overrun count, but is a nonportable extension to POSIX.1-2001."
8838 #. FIXME . Austin bug filed, 11 Feb 09
8840 #: build/C/man2/timer_getoverrun.2:112
8842 "POSIX.1-2001 only discusses timer overruns in the context of timer "
8843 "notifications using signals."
8846 #. Bug filed: http://bugzilla.kernel.org/show_bug.cgi?id=12665
8847 #. http://thread.gmane.org/gmane.linux.kernel/113276/
8849 #: build/C/man2/timer_getoverrun.2:125
8851 "POSIX.1-2001 specifies that if the timer overrun count is equal to or "
8852 "greater than an implementation-defined maximum, B<DELAYTIMER_MAX>, then "
8853 "B<timer_getoverrun>() should return B<DELAYTIMER_MAX>. However, Linux does "
8854 "not implement this feature: instead, if the timer overrun value exceeds the "
8855 "maximum representable integer, the counter cycles, starting once more from "
8860 #: build/C/man2/timer_getoverrun.2:128 build/C/man2/timer_settime.2:208
8861 msgid "See B<timer_create>(2)."
8865 #: build/C/man2/timer_getoverrun.2:138
8867 "B<clock_gettime>(2), B<sigaction>(2), B<signalfd>(2), B<sigwaitinfo>(2), "
8868 "B<timer_create>(2), B<timer_delete>(2), B<timer_settime>(2), B<signal>(7), "
8873 #: build/C/man2/timer_settime.2:23
8875 msgid "TIMER_SETTIME"
8879 #: build/C/man2/timer_settime.2:27
8881 "timer_settime, timer_gettime - arm/disarm and fetch state of POSIX "
8886 #: build/C/man2/timer_settime.2:35
8889 "B<int timer_settime(timer_t >I<timerid>B<, int >I<flags>B<,>\n"
8890 "B< const struct itimerspec *>I<new_value>B<,>\n"
8891 "B< struct itimerspec * >I<old_value>B<);>\n"
8892 "B<int timer_gettime(timer_t >I<timerid>B<, struct itimerspec "
8893 "*>I<curr_value>B<);>\n"
8897 #: build/C/man2/timer_settime.2:47
8898 msgid "B<timer_settime>(), B<timer_gettime>(): _POSIX_C_SOURCE\\ E<gt>=\\ 199309L"
8902 #: build/C/man2/timer_settime.2:60
8904 "B<timer_settime>() arms or disarms the timer identified by I<timerid>. The "
8905 "I<new_value> argument is an I<itimerspec> structure that specifies the new "
8906 "initial value and the new interval for the timer. The I<itimerspec> "
8907 "structure is defined as follows:"
8911 #: build/C/man2/timer_settime.2:67 build/C/man2/timerfd_create.2:127
8914 "struct timespec {\n"
8915 " time_t tv_sec; /* Seconds */\n"
8916 " long tv_nsec; /* Nanoseconds */\n"
8921 #: build/C/man2/timer_settime.2:72
8924 "struct itimerspec {\n"
8925 " struct timespec it_interval; /* Timer interval */\n"
8926 " struct timespec it_value; /* Initial expiration */\n"
8931 #: build/C/man2/timer_settime.2:84
8933 "Each of the substructures of the I<itimerspec> structure is a I<timespec> "
8934 "structure that allows a time value to be specified in seconds and "
8935 "nanoseconds. These time values are measured according to the clock that was "
8936 "specified when the timer was created by B<timer_create>(2)"
8940 #: build/C/man2/timer_settime.2:98
8942 "If I<new_value-E<gt>it_value> specifies a nonzero value (i.e., either "
8943 "subfield is nonzero), then B<timer_settime>() arms (starts) the timer, "
8944 "setting it to initially expire at the given time. (If the timer was already "
8945 "armed, then the previous settings are overwritten.) If "
8946 "I<new_value-E<gt>it_value> specifies a zero value (i.e., both subfields are "
8947 "zero), then the timer is disarmed."
8951 #: build/C/man2/timer_settime.2:110
8953 "The I<new_value-E<gt>it_interval> field specifies the period of the timer, "
8954 "in seconds and nanoseconds. If this field is nonzero, then each time that "
8955 "an armed timer expires, the timer is reloaded from the value specified in "
8956 "I<new_value-E<gt>it_interval>. If I<new_value-E<gt>it_interval> specifies a "
8957 "zero value then the timer expires just once, at the time specified by "
8961 #. By experiment: the overrun count is set correctly, for CLOCK_REALTIME.
8963 #: build/C/man2/timer_settime.2:131
8965 "By default, the initial expiration time specified in "
8966 "I<new_value-E<gt>it_value> is interpreted relative to the current time on "
8967 "the timer's clock at the time of the call. This can be modified by "
8968 "specifying B<TIMER_ABSTIME> in I<flags>, in which case "
8969 "I<new_value-E<gt>it_value> is interpreted as an absolute value as measured "
8970 "on the timer's clock; that is, the timer will expire when the clock value "
8971 "reaches the value specified by I<new_value-E<gt>it_value>. If the specified "
8972 "absolute time has already passed, then the timer expires immediately, and "
8973 "the overrun count (see B<timer_getoverrun>(2)) will be set correctly."
8976 #. Similar remarks might apply with respect to process and thread CPU time
8977 #. clocks, but these clocks are not currently (2.6.28) settable on Linux.
8979 #: build/C/man2/timer_settime.2:141
8981 "If the value of the B<CLOCK_REALTIME> clock is adjusted while an absolute "
8982 "timer based on that clock is armed, then the expiration of the timer will be "
8983 "appropriately adjusted. Adjustments to the B<CLOCK_REALTIME> clock have no "
8984 "effect on relative timers based on that clock."
8988 #: build/C/man2/timer_settime.2:149
8990 "If I<old_value> is not NULL, then it returns the previous interval of the "
8991 "timer (in I<old_value-E<gt>it_interval>) and the amount of time until the "
8992 "timer would previously have next expired (in I<old_value-E<gt>it_value>)."
8996 #: build/C/man2/timer_settime.2:169
8998 "B<timer_gettime>() returns the time until next expiration, and the "
8999 "interval, for the timer specified by I<timerid>, in the buffer pointed to by "
9000 "I<curr_value>. The time remaining until the next timer expiration is "
9001 "returned in I<curr_value-E<gt>it_value>; this is always a relative value, "
9002 "regardless of whether the B<TIMER_ABSTIME> flag was used when arming the "
9003 "timer. If the value returned in I<curr_value-E<gt>it_value> is zero, then "
9004 "the timer is currently disarmed. The timer interval is returned in "
9005 "I<curr_value-E<gt>it_interval>. If the value returned in "
9006 "I<curr_value-E<gt>it_interval> is zero, then this is a \"one-shot\" timer."
9010 #: build/C/man2/timer_settime.2:178
9012 "On success, B<timer_settime>() and B<timer_gettime>() return 0. On error, "
9013 "-1 is returned, and I<errno> is set to indicate the error."
9017 #: build/C/man2/timer_settime.2:180
9018 msgid "These functions may fail with the following errors:"
9022 #: build/C/man2/timer_settime.2:187
9023 msgid "I<new_value>, I<old_value>, or I<curr_value> is not a valid pointer."
9026 #. FIXME . eventually: invalid value in flags
9028 #: build/C/man2/timer_settime.2:192
9029 msgid "I<timerid> is invalid."
9033 #: build/C/man2/timer_settime.2:195
9034 msgid "B<timer_settime>() may fail with the following errors:"
9038 #: build/C/man2/timer_settime.2:201
9040 "I<new_value.it_value> is negative; or I<new_value.it_value.tv_nsec> is "
9041 "negative or greater than 999,999,999."
9045 #: build/C/man2/timer_settime.2:203
9046 msgid "These system calls are available since Linux 2.6."
9050 #: build/C/man2/timer_settime.2:212
9051 msgid "B<timer_create>(2), B<timer_getoverrun>(2), B<time>(7)"
9055 #: build/C/man2/timerfd_create.2:20
9057 msgid "TIMERFD_CREATE"
9061 #: build/C/man2/timerfd_create.2:20
9067 #: build/C/man2/timerfd_create.2:24
9069 "timerfd_create, timerfd_settime, timerfd_gettime - timers that notify via "
9074 #: build/C/man2/timerfd_create.2:27
9076 msgid "B<#include E<lt>sys/timerfd.hE<gt>>\n"
9080 #: build/C/man2/timerfd_create.2:29
9082 msgid "B<int timerfd_create(int >I<clockid>B<, int >I<flags>B<);>\n"
9086 #: build/C/man2/timerfd_create.2:33
9089 "B<int timerfd_settime(int >I<fd>B<, int >I<flags>B<,>\n"
9090 "B< const struct itimerspec *>I<new_value>B<,>\n"
9091 "B< struct itimerspec *>I<old_value>B<);>\n"
9095 #: build/C/man2/timerfd_create.2:35
9097 msgid "B<int timerfd_gettime(int >I<fd>B<, struct itimerspec *>I<curr_value>B<);>\n"
9101 #: build/C/man2/timerfd_create.2:48
9103 "These system calls create and operate on a timer that delivers timer "
9104 "expiration notifications via a file descriptor. They provide an alternative "
9105 "to the use of B<setitimer>(2) or B<timer_create>(2), with the advantage "
9106 "that the file descriptor may be monitored by B<select>(2), B<poll>(2), and "
9111 #: build/C/man2/timerfd_create.2:60
9113 "The use of these three system calls is analogous to the use of "
9114 "B<timer_create>(2), B<timer_settime>(2), and B<timer_gettime>(2). (There is "
9115 "no analog of B<timer_getoverrun>(2), since that functionality is provided by "
9116 "B<read>(2), as described below.)"
9120 #: build/C/man2/timerfd_create.2:60
9122 msgid "timerfd_create()"
9126 #: build/C/man2/timerfd_create.2:79
9128 "B<timerfd_create>() creates a new timer object, and returns a file "
9129 "descriptor that refers to that timer. The I<clockid> argument specifies the "
9130 "clock that is used to mark the progress of the timer, and must be either "
9131 "B<CLOCK_REALTIME> or B<CLOCK_MONOTONIC>. B<CLOCK_REALTIME> is a settable "
9132 "system-wide clock. B<CLOCK_MONOTONIC> is a nonsettable clock that is not "
9133 "affected by discontinuous changes in the system clock (e.g., manual changes "
9134 "to system time). The current value of each of these clocks can be retrieved "
9135 "using B<clock_gettime>(2)."
9139 #: build/C/man2/timerfd_create.2:84
9141 "Starting with Linux 2.6.27, the following values may be bitwise ORed in "
9142 "I<flags> to change the behavior of B<timerfd_create>():"
9146 #: build/C/man2/timerfd_create.2:84
9148 msgid "B<TFD_NONBLOCK>"
9152 #: build/C/man2/timerfd_create.2:92
9154 msgid "B<TFD_CLOEXEC>"
9158 #: build/C/man2/timerfd_create.2:106
9160 "In Linux versions up to and including 2.6.26, I<flags> must be specified as "
9165 #: build/C/man2/timerfd_create.2:106
9167 msgid "timerfd_settime()"
9171 #: build/C/man2/timerfd_create.2:111
9173 "B<timerfd_settime>() arms (starts) or disarms (stops) the timer referred "
9174 "to by the file descriptor I<fd>."
9178 #: build/C/man2/timerfd_create.2:120
9180 "The I<new_value> argument specifies the initial expiration and interval for "
9181 "the timer. The I<itimer> structure used for this argument contains two "
9182 "fields, each of which is in turn a structure of type I<timespec>:"
9186 #: build/C/man2/timerfd_create.2:132
9189 "struct itimerspec {\n"
9190 " struct timespec it_interval; /* Interval for periodic timer */\n"
9191 " struct timespec it_value; /* Initial expiration */\n"
9196 #: build/C/man2/timerfd_create.2:144
9198 "I<new_value.it_value> specifies the initial expiration of the timer, in "
9199 "seconds and nanoseconds. Setting either field of I<new_value.it_value> to a "
9200 "nonzero value arms the timer. Setting both fields of I<new_value.it_value> "
9201 "to zero disarms the timer."
9205 #: build/C/man2/timerfd_create.2:153
9207 "Setting one or both fields of I<new_value.it_interval> to nonzero values "
9208 "specifies the period, in seconds and nanoseconds, for repeated timer "
9209 "expirations after the initial expiration. If both fields of "
9210 "I<new_value.it_interval> are zero, the timer expires just once, at the time "
9211 "specified by I<new_value.it_value>."
9215 #: build/C/man2/timerfd_create.2:169
9217 "The I<flags> argument is either 0, to start a relative timer "
9218 "(I<new_value.it_value> specifies a time relative to the current value of the "
9219 "clock specified by I<clockid>), or B<TFD_TIMER_ABSTIME>, to start an "
9220 "absolute timer (I<new_value.it_value> specifies an absolute time for the "
9221 "clock specified by I<clockid>; that is, the timer will expire when the value "
9222 "of that clock reaches the value specified in I<new_value.it_value>)."
9226 #: build/C/man2/timerfd_create.2:180
9228 "If the I<old_value> argument is not NULL, then the I<itimerspec> structure "
9229 "that it points to is used to return the setting of the timer that was "
9230 "current at the time of the call; see the description of B<timerfd_gettime>() "
9235 #: build/C/man2/timerfd_create.2:180
9237 msgid "timerfd_gettime()"
9241 #: build/C/man2/timerfd_create.2:189
9243 "B<timerfd_gettime>() returns, in I<curr_value>, an I<itimerspec> structure "
9244 "that contains the current setting of the timer referred to by the file "
9249 #: build/C/man2/timerfd_create.2:199
9251 "The I<it_value> field returns the amount of time until the timer will next "
9252 "expire. If both fields of this structure are zero, then the timer is "
9253 "currently disarmed. This field always contains a relative value, regardless "
9254 "of whether the B<TFD_TIMER_ABSTIME> flag was specified when setting the "
9259 #: build/C/man2/timerfd_create.2:206
9261 "The I<it_interval> field returns the interval of the timer. If both fields "
9262 "of this structure are zero, then the timer is set to expire just once, at "
9263 "the time specified by I<curr_value.it_value>."
9267 #: build/C/man2/timerfd_create.2:206
9269 msgid "Operating on a timer file descriptor"
9273 #: build/C/man2/timerfd_create.2:210
9275 "The file descriptor returned by B<timerfd_create>() supports the following "
9280 #: build/C/man2/timerfd_create.2:224
9282 "If the timer has already expired one or more times since its settings were "
9283 "last modified using B<timerfd_settime>(), or since the last successful "
9284 "B<read>(2), then the buffer given to B<read>(2) returns an unsigned 8-byte "
9285 "integer (I<uint64_t>) containing the number of expirations that have "
9286 "occurred. (The returned value is in host byte order, i.e., the native byte "
9287 "order for integers on the host machine.)"
9291 #: build/C/man2/timerfd_create.2:237
9293 "If no timer expirations have occurred at the time of the B<read>(2), then "
9294 "the call either blocks until the next timer expiration, or fails with the "
9295 "error B<EAGAIN> if the file descriptor has been made nonblocking (via the "
9296 "use of the B<fcntl>(2) B<F_SETFL> operation to set the B<O_NONBLOCK> flag)."
9300 #: build/C/man2/timerfd_create.2:243
9302 "A B<read>(2) will fail with the error B<EINVAL> if the size of the supplied "
9303 "buffer is less than 8 bytes."
9307 #: build/C/man2/timerfd_create.2:254
9309 "The file descriptor is readable (the B<select>(2) I<readfds> argument; the "
9310 "B<poll>(2) B<POLLIN> flag) if one or more timer expirations have occurred."
9314 #: build/C/man2/timerfd_create.2:261
9316 "The file descriptor also supports the other file-descriptor multiplexing "
9317 "APIs: B<pselect>(2), B<ppoll>(2), and B<epoll>(7)."
9321 #: build/C/man2/timerfd_create.2:268
9323 "When the file descriptor is no longer required it should be closed. When "
9324 "all file descriptors associated with the same timer object have been closed, "
9325 "the timer is disarmed and its resources are freed by the kernel."
9329 #: build/C/man2/timerfd_create.2:280
9331 "After a B<fork>(2), the child inherits a copy of the file descriptor created "
9332 "by B<timerfd_create>(). The file descriptor refers to the same underlying "
9333 "timer object as the corresponding file descriptor in the parent, and "
9334 "B<read>(2)s in the child will return information about expirations of the "
9339 #: build/C/man2/timerfd_create.2:286
9341 "A file descriptor created by B<timerfd_create>() is preserved across "
9342 "B<execve>(2), and continues to generate timer expirations if the timer was "
9347 #: build/C/man2/timerfd_create.2:293
9349 "On success, B<timerfd_create>() returns a new file descriptor. On error, "
9350 "-1 is returned and I<errno> is set to indicate the error."
9354 #: build/C/man2/timerfd_create.2:301
9356 "B<timerfd_settime>() and B<timerfd_gettime>() return 0 on success; on "
9357 "error they return -1, and set I<errno> to indicate the error."
9361 #: build/C/man2/timerfd_create.2:304
9362 msgid "B<timerfd_create>() can fail with the following errors:"
9366 #: build/C/man2/timerfd_create.2:312
9367 msgid "The I<clockid> argument is neither B<CLOCK_MONOTONIC> nor B<CLOCK_REALTIME>;"
9371 #: build/C/man2/timerfd_create.2:332
9372 msgid "There was insufficient kernel memory to create the timer."
9376 #: build/C/man2/timerfd_create.2:337
9378 "B<timerfd_settime>() and B<timerfd_gettime>() can fail with the following "
9383 #: build/C/man2/timerfd_create.2:341
9384 msgid "I<fd> is not a valid file descriptor."
9388 #: build/C/man2/timerfd_create.2:352
9389 msgid "I<fd> is not a valid timerfd file descriptor."
9393 #: build/C/man2/timerfd_create.2:355
9394 msgid "B<timerfd_settime>() can also fail with the following errors:"
9398 #: build/C/man2/timerfd_create.2:361
9400 "I<new_value> is not properly initialized (one of the I<tv_nsec> falls "
9401 "outside the range zero to 999,999,999)."
9404 #. This case only checked since 2.6.29, and 2.2.2[78].some-stable-version.
9405 #. In older kernel versions, no check was made for invalid flags.
9407 #: build/C/man2/timerfd_create.2:367
9408 msgid "I<flags> is invalid."
9412 #: build/C/man2/timerfd_create.2:370
9414 "These system calls are available on Linux since kernel 2.6.25. Library "
9415 "support is provided by glibc since version 2.8."
9419 #: build/C/man2/timerfd_create.2:381
9421 "The following program creates a timer and then monitors its progress. The "
9422 "program accepts up to three command-line arguments. The first argument "
9423 "specifies the number of seconds for the initial expiration of the timer. "
9424 "The second argument specifies the interval for the timer, in seconds. The "
9425 "third argument specifies the number of times the program should allow the "
9426 "timer to expire before terminating. The second and third command-line "
9427 "arguments are optional."
9431 #: build/C/man2/timerfd_create.2:383 build/C/man2/wait.2:541
9432 msgid "The following shell session demonstrates the use of the program:"
9436 #: build/C/man2/timerfd_create.2:398
9439 "$B< a.out 3 1 100>\n"
9440 "0.000: timer started\n"
9441 "3.000: read: 1; total=1\n"
9442 "4.000: read: 1; total=2\n"
9443 "B<^Z > # type control-Z to suspend the program\n"
9444 "[1]+ Stopped ./timerfd3_demo 3 1 100\n"
9445 "$ B<fg> # Resume execution after a few seconds\n"
9447 "9.660: read: 5; total=7\n"
9448 "10.000: read: 1; total=8\n"
9449 "11.000: read: 1; total=9\n"
9450 "B<^C > # type control-C to suspend the program\n"
9453 #. The commented out code here is what we currently need until
9454 #. the required stuff is in glibc
9457 #. /* Link with -lrt */
9458 #. #define _GNU_SOURCE
9459 #. #include <sys/syscall.h>
9460 #. #include <unistd.h>
9461 #. #include <time.h>
9462 #. #if defined(__i386__)
9463 #. #define __NR_timerfd_create 322
9464 #. #define __NR_timerfd_settime 325
9465 #. #define __NR_timerfd_gettime 326
9469 #. timerfd_create(int clockid, int flags)
9471 #. return syscall(__NR_timerfd_create, clockid, flags);
9475 #. timerfd_settime(int fd, int flags, struct itimerspec *new_value,
9476 #. struct itimerspec *curr_value)
9478 #. return syscall(__NR_timerfd_settime, fd, flags, new_value,
9483 #. timerfd_gettime(int fd, struct itimerspec *curr_value)
9485 #. return syscall(__NR_timerfd_gettime, fd, curr_value);
9488 #. #define TFD_TIMER_ABSTIME (1 << 0)
9490 #. ////////////////////////////////////////////////////////////
9492 #: build/C/man2/timerfd_create.2:447
9495 "#include E<lt>sys/timerfd.hE<gt>\n"
9496 "#include E<lt>time.hE<gt>\n"
9497 "#include E<lt>unistd.hE<gt>\n"
9498 "#include E<lt>stdlib.hE<gt>\n"
9499 "#include E<lt>stdio.hE<gt>\n"
9500 "#include E<lt>stdint.hE<gt> /* Definition of uint64_t */\n"
9504 #: build/C/man2/timerfd_create.2:450
9507 "#define handle_error(msg) \\e\n"
9508 " do { perror(msg); exit(EXIT_FAILURE); } while (0)\n"
9512 #: build/C/man2/timerfd_create.2:458
9516 "print_elapsed_time(void)\n"
9518 " static struct timespec start;\n"
9519 " struct timespec curr;\n"
9520 " static int first_call = 1;\n"
9521 " int secs, nsecs;\n"
9525 #: build/C/man2/timerfd_create.2:464
9528 " if (first_call) {\n"
9529 " first_call = 0;\n"
9530 " if (clock_gettime(CLOCK_MONOTONIC, &start) == -1)\n"
9531 " handle_error(\"clock_gettime\");\n"
9536 #: build/C/man2/timerfd_create.2:467
9539 " if (clock_gettime(CLOCK_MONOTONIC, &curr) == -1)\n"
9540 " handle_error(\"clock_gettime\");\n"
9544 #: build/C/man2/timerfd_create.2:476
9547 " secs = curr.tv_sec - start.tv_sec;\n"
9548 " nsecs = curr.tv_nsec - start.tv_nsec;\n"
9549 " if (nsecs E<lt> 0) {\n"
9551 " nsecs += 1000000000;\n"
9553 " printf(\"%d.%03d: \", secs, (nsecs + 500000) / 1000000);\n"
9558 #: build/C/man2/timerfd_create.2:485
9562 "main(int argc, char *argv[])\n"
9564 " struct itimerspec new_value;\n"
9565 " int max_exp, fd;\n"
9566 " struct timespec now;\n"
9567 " uint64_t exp, tot_exp;\n"
9572 #: build/C/man2/timerfd_create.2:491
9575 " if ((argc != 2) && (argc != 4)) {\n"
9576 " fprintf(stderr, \"%s init-secs [interval-secs max-exp]\\en\",\n"
9578 " exit(EXIT_FAILURE);\n"
9583 #: build/C/man2/timerfd_create.2:494
9586 " if (clock_gettime(CLOCK_REALTIME, &now) == -1)\n"
9587 " handle_error(\"clock_gettime\");\n"
9591 #: build/C/man2/timerfd_create.2:497
9594 " /* Create a CLOCK_REALTIME absolute timer with initial\n"
9595 " expiration and interval as specified in command line */\n"
9599 #: build/C/man2/timerfd_create.2:508
9602 " new_value.it_value.tv_sec = now.tv_sec + atoi(argv[1]);\n"
9603 " new_value.it_value.tv_nsec = now.tv_nsec;\n"
9604 " if (argc == 2) {\n"
9605 " new_value.it_interval.tv_sec = 0;\n"
9608 " new_value.it_interval.tv_sec = atoi(argv[2]);\n"
9609 " max_exp = atoi(argv[3]);\n"
9611 " new_value.it_interval.tv_nsec = 0;\n"
9615 #: build/C/man2/timerfd_create.2:512
9618 " fd = timerfd_create(CLOCK_REALTIME, 0);\n"
9620 " handle_error(\"timerfd_create\");\n"
9624 #: build/C/man2/timerfd_create.2:515
9627 " if (timerfd_settime(fd, TFD_TIMER_ABSTIME, &new_value, NULL) == -1)\n"
9628 " handle_error(\"timerfd_settime\");\n"
9632 #: build/C/man2/timerfd_create.2:518
9635 " print_elapsed_time();\n"
9636 " printf(\"timer started\\en\");\n"
9640 #: build/C/man2/timerfd_create.2:523
9643 " for (tot_exp = 0; tot_exp E<lt> max_exp;) {\n"
9644 " s = read(fd, &exp, sizeof(uint64_t));\n"
9645 " if (s != sizeof(uint64_t))\n"
9646 " handle_error(\"read\");\n"
9650 #: build/C/man2/timerfd_create.2:530
9653 " tot_exp += exp;\n"
9654 " print_elapsed_time();\n"
9655 " printf(\"read: %llu; total=%llu\\en\",\n"
9656 " (unsigned long long) exp,\n"
9657 " (unsigned long long) tot_exp);\n"
9663 #: build/C/man2/timerfd_create.2:540
9665 "Currently, B<timerfd_create>() supports fewer types of clock IDs than "
9666 "B<timer_create>(2)."
9670 #: build/C/man2/timerfd_create.2:552
9672 "B<eventfd>(2), B<poll>(2), B<read>(2), B<select>(2), B<setitimer>(2), "
9673 "B<signalfd>(2), B<timer_create>(2), B<timer_gettime>(2), "
9674 "B<timer_settime>(2), B<epoll>(7), B<time>(7)"
9678 #: build/C/man2/tkill.2:29
9684 #: build/C/man2/tkill.2:32
9685 msgid "tkill, tgkill - send a signal to a thread"
9689 #: build/C/man2/tkill.2:35
9691 msgid "B<int tkill(int >I<tid>B<, int >I<sig>B<);>\n"
9695 #: build/C/man2/tkill.2:37
9697 msgid "B<int tgkill(int >I<tgid>B<, int >I<tid>B<, int >I<sig>B<);>\n"
9701 #: build/C/man2/tkill.2:51
9703 "B<tgkill>() sends the signal I<sig> to the thread with the thread ID I<tid> "
9704 "in the thread group I<tgid>. (By contrast, B<kill>(2) can only be used to "
9705 "send a signal to a process (i.e., thread group) as a whole, and the signal "
9706 "will be delivered to an arbitrary thread within that process.)"
9710 #: build/C/man2/tkill.2:59
9712 "B<tkill>() is an obsolete predecessor to B<tgkill>(). It only allows the "
9713 "target thread ID to be specified, which may result in the wrong thread being "
9714 "signaled if a thread terminates and its thread ID is recycled. Avoid using "
9719 #: build/C/man2/tkill.2:66
9720 msgid "If I<tgid> is specified as -1, B<tgkill>() is equivalent to B<tkill>()."
9724 #: build/C/man2/tkill.2:69
9726 "These are the raw system call interfaces, meant for internal thread library "
9731 #: build/C/man2/tkill.2:77
9732 msgid "An invalid thread ID, thread group ID, or signal was specified."
9736 #: build/C/man2/tkill.2:82
9737 msgid "Permission denied. For the required permissions, see B<kill>(2)."
9741 #: build/C/man2/tkill.2:85
9742 msgid "No process with the specified thread ID (and thread group ID) exists."
9746 #: build/C/man2/tkill.2:90
9748 "B<tkill>() is supported since Linux 2.4.19 / 2.5.4. B<tgkill>() was added "
9753 #: build/C/man2/tkill.2:96
9755 "B<tkill>() and B<tgkill>() are Linux-specific and should not be used in "
9756 "programs that are intended to be portable."
9760 #: build/C/man2/tkill.2:102
9762 "See the description of B<CLONE_THREAD> in B<clone>(2) for an explanation of "
9767 #: build/C/man2/tkill.2:105
9769 "Glibc does not provide wrappers for these system calls; call them using "
9774 #: build/C/man2/tkill.2:110
9775 msgid "B<clone>(2), B<gettid>(2), B<kill>(2), B<rt_sigqueueinfo>(2)"
9779 #: build/C/man2/wait.2:50
9785 #: build/C/man2/wait.2:53
9786 msgid "wait, waitpid, waitid - wait for process to change state"
9790 #: build/C/man2/wait.2:55
9791 msgid "B<#include E<lt>sys/types.hE<gt>>"
9795 #: build/C/man2/wait.2:57
9796 msgid "B<#include E<lt>sys/wait.hE<gt>>"
9800 #: build/C/man2/wait.2:59
9801 msgid "B<pid_t wait(int *>I<status>B<);>"
9805 #: build/C/man2/wait.2:61
9806 msgid "B<pid_t waitpid(pid_t >I<pid>B<, int *>I<status>B<, int >I<options>B<);>"
9810 #: build/C/man2/wait.2:64
9812 "B<int waitid(idtype_t >I<idtype>B<, id_t >I<id>B<, siginfo_t *>I<infop>B<, "
9813 "int >I<options>B<);>"
9817 #: build/C/man2/wait.2:73
9818 msgid "B<waitid>():"
9822 #: build/C/man2/wait.2:77
9824 "_SVID_SOURCE || _XOPEN_SOURCE\\ E<gt>=\\ 500 || _XOPEN_SOURCE\\ &&\\ "
9825 "_XOPEN_SOURCE_EXTENDED"
9829 #: build/C/man2/wait.2:92
9831 "All of these system calls are used to wait for state changes in a child of "
9832 "the calling process, and obtain information about the child whose state has "
9833 "changed. A state change is considered to be: the child terminated; the "
9834 "child was stopped by a signal; or the child was resumed by a signal. In the "
9835 "case of a terminated child, performing a wait allows the system to release "
9836 "the resources associated with the child; if a wait is not performed, then "
9837 "the terminated child remains in a \"zombie\" state (see NOTES below)."
9841 #: build/C/man2/wait.2:104
9843 "If a child has already changed state, then these calls return immediately. "
9844 "Otherwise they block until either a child changes state or a signal handler "
9845 "interrupts the call (assuming that system calls are not automatically "
9846 "restarted using the B<SA_RESTART> flag of B<sigaction>(2)). In the "
9847 "remainder of this page, a child whose state has changed and which has not "
9848 "yet been waited upon by one of these system calls is termed I<waitable>."
9852 #: build/C/man2/wait.2:104
9854 msgid "wait() and waitpid()"
9858 #: build/C/man2/wait.2:112
9860 "The B<wait>() system call suspends execution of the calling process until "
9861 "one of its children terminates. The call I<wait(&status)> is equivalent to:"
9865 #: build/C/man2/wait.2:115
9867 msgid " waitpid(-1, &status, 0);\n"
9871 #: build/C/man2/wait.2:129
9873 "The B<waitpid>() system call suspends execution of the calling process "
9874 "until a child specified by I<pid> argument has changed state. By default, "
9875 "B<waitpid>() waits only for terminated children, but this behavior is "
9876 "modifiable via the I<options> argument, as described below."
9880 #: build/C/man2/wait.2:133
9881 msgid "The value of I<pid> can be:"
9885 #: build/C/man2/wait.2:133
9891 #: build/C/man2/wait.2:137
9893 "meaning wait for any child process whose process group ID is equal to the "
9894 "absolute value of I<pid>."
9898 #: build/C/man2/wait.2:137
9904 #: build/C/man2/wait.2:139
9905 msgid "meaning wait for any child process."
9909 #: build/C/man2/wait.2:139
9915 #: build/C/man2/wait.2:142
9917 "meaning wait for any child process whose process group ID is equal to that "
9918 "of the calling process."
9922 #: build/C/man2/wait.2:142
9928 #: build/C/man2/wait.2:146
9929 msgid "meaning wait for the child whose process ID is equal to the value of I<pid>."
9933 #: build/C/man2/wait.2:150
9934 msgid "The value of I<options> is an OR of zero or more of the following constants:"
9938 #: build/C/man2/wait.2:150 build/C/man2/wait.2:279
9944 #: build/C/man2/wait.2:153
9945 msgid "return immediately if no child has exited."
9949 #: build/C/man2/wait.2:153
9951 msgid "B<WUNTRACED>"
9955 #: build/C/man2/wait.2:162
9957 "also return if a child has stopped (but not traced via B<ptrace>(2)). "
9958 "Status for I<traced> children which have stopped is provided even if this "
9959 "option is not specified."
9963 #: build/C/man2/wait.2:162
9965 msgid "B<WCONTINUED> (since Linux 2.6.10)"
9969 #: build/C/man2/wait.2:166
9970 msgid "also return if a stopped child has been resumed by delivery of B<SIGCONT>."
9974 #: build/C/man2/wait.2:168
9975 msgid "(For Linux-only options, see below.)"
9979 #: build/C/man2/wait.2:182
9981 "If I<status> is not NULL, B<wait>() and B<waitpid>() store status "
9982 "information in the I<int> to which it points. This integer can be inspected "
9983 "with the following macros (which take the integer itself as an argument, not "
9984 "a pointer to it, as is done in B<wait>() and B<waitpid>()!):"
9988 #: build/C/man2/wait.2:182
9990 msgid "B<WIFEXITED(>I<status>B<)>"
9994 #: build/C/man2/wait.2:190
9996 "returns true if the child terminated normally, that is, by calling "
9997 "B<exit>(3) or B<_exit>(2), or by returning from main()."
10001 #: build/C/man2/wait.2:190
10003 msgid "B<WEXITSTATUS(>I<status>B<)>"
10006 #. type: Plain text
10007 #: build/C/man2/wait.2:203
10009 "returns the exit status of the child. This consists of the least "
10010 "significant 8 bits of the I<status> argument that the child specified in a "
10011 "call to B<exit>(3) or B<_exit>(2) or as the argument for a return "
10012 "statement in main(). This macro should only be employed if B<WIFEXITED> "
10017 #: build/C/man2/wait.2:203
10019 msgid "B<WIFSIGNALED(>I<status>B<)>"
10022 #. type: Plain text
10023 #: build/C/man2/wait.2:206
10024 msgid "returns true if the child process was terminated by a signal."
10028 #: build/C/man2/wait.2:206
10030 msgid "B<WTERMSIG(>I<status>B<)>"
10033 #. type: Plain text
10034 #: build/C/man2/wait.2:213
10036 "returns the number of the signal that caused the child process to "
10037 "terminate. This macro should only be employed if B<WIFSIGNALED> returned "
10042 #: build/C/man2/wait.2:213
10044 msgid "B<WCOREDUMP(>I<status>B<)>"
10047 #. type: Plain text
10048 #: build/C/man2/wait.2:222
10050 "returns true if the child produced a core dump. This macro should only be "
10051 "employed if B<WIFSIGNALED> returned true. This macro is not specified in "
10052 "POSIX.1-2001 and is not available on some UNIX implementations (e.g., AIX, "
10053 "SunOS). Only use this enclosed in #ifdef WCOREDUMP ... #endif."
10057 #: build/C/man2/wait.2:222
10059 msgid "B<WIFSTOPPED(>I<status>B<)>"
10062 #. type: Plain text
10063 #: build/C/man2/wait.2:229
10065 "returns true if the child process was stopped by delivery of a signal; this "
10066 "is only possible if the call was done using B<WUNTRACED> or when the child "
10067 "is being traced (see B<ptrace>(2))."
10071 #: build/C/man2/wait.2:229
10073 msgid "B<WSTOPSIG(>I<status>B<)>"
10076 #. type: Plain text
10077 #: build/C/man2/wait.2:235
10079 "returns the number of the signal which caused the child to stop. This macro "
10080 "should only be employed if B<WIFSTOPPED> returned true."
10084 #: build/C/man2/wait.2:235
10086 msgid "B<WIFCONTINUED(>I<status>B<)>"
10089 #. type: Plain text
10090 #: build/C/man2/wait.2:240
10092 "(since Linux 2.6.10) returns true if the child process was resumed by "
10093 "delivery of B<SIGCONT>."
10097 #: build/C/man2/wait.2:240
10102 #. type: Plain text
10103 #: build/C/man2/wait.2:245
10105 "The B<waitid>() system call (available since Linux 2.6.9) provides more "
10106 "precise control over which child state changes to wait for."
10109 #. type: Plain text
10110 #: build/C/man2/wait.2:251
10112 "The I<idtype> and I<id> arguments select the child(ren) to wait for, as "
10117 #: build/C/man2/wait.2:251
10119 msgid "I<idtype> == B<P_PID>"
10122 #. type: Plain text
10123 #: build/C/man2/wait.2:254
10124 msgid "Wait for the child whose process ID matches I<id>."
10128 #: build/C/man2/wait.2:254
10130 msgid "I<idtype> == B<P_PGID>"
10133 #. type: Plain text
10134 #: build/C/man2/wait.2:257
10135 msgid "Wait for any child whose process group ID matches I<id>."
10139 #: build/C/man2/wait.2:257
10141 msgid "I<idtype> == B<P_ALL>"
10144 #. type: Plain text
10145 #: build/C/man2/wait.2:261
10146 msgid "Wait for any child; I<id> is ignored."
10149 #. type: Plain text
10150 #: build/C/man2/wait.2:265
10152 "The child state changes to wait for are specified by ORing one or more of "
10153 "the following flags in I<options>:"
10157 #: build/C/man2/wait.2:265
10162 #. type: Plain text
10163 #: build/C/man2/wait.2:268
10164 msgid "Wait for children that have terminated."
10168 #: build/C/man2/wait.2:268
10170 msgid "B<WSTOPPED>"
10173 #. type: Plain text
10174 #: build/C/man2/wait.2:271
10175 msgid "Wait for children that have been stopped by delivery of a signal."
10179 #: build/C/man2/wait.2:271
10181 msgid "B<WCONTINUED>"
10184 #. type: Plain text
10185 #: build/C/man2/wait.2:276
10187 "Wait for (previously stopped) children that have been resumed by delivery of "
10191 #. type: Plain text
10192 #: build/C/man2/wait.2:279
10193 msgid "The following flags may additionally be ORed in I<options>:"
10196 #. type: Plain text
10197 #: build/C/man2/wait.2:283
10198 msgid "As for B<waitpid>()."
10202 #: build/C/man2/wait.2:283
10207 #. type: Plain text
10208 #: build/C/man2/wait.2:287
10210 "Leave the child in a waitable state; a later wait call can be used to again "
10211 "retrieve the child status information."
10214 #. type: Plain text
10215 #: build/C/man2/wait.2:294
10217 "Upon successful return, B<waitid>() fills in the following fields of the "
10218 "I<siginfo_t> structure pointed to by I<infop>:"
10221 #. type: Plain text
10222 #: build/C/man2/wait.2:297
10223 msgid "The process ID of the child."
10226 #. type: Plain text
10227 #: build/C/man2/wait.2:301
10229 "The real user ID of the child. (This field is not set on most other "
10230 "implementations.)"
10233 #. type: Plain text
10234 #: build/C/man2/wait.2:305
10235 msgid "Always set to B<SIGCHLD>."
10239 #: build/C/man2/wait.2:305
10241 msgid "I<si_status>"
10244 #. type: Plain text
10245 #: build/C/man2/wait.2:315
10247 "Either the exit status of the child, as given to B<_exit>(2) (or "
10248 "B<exit>(3)), or the signal that caused the child to terminate, stop, or "
10249 "continue. The I<si_code> field can be used to determine how to interpret "
10253 #. type: Plain text
10254 #: build/C/man2/wait.2:332
10256 "Set to one of: B<CLD_EXITED> (child called B<_exit>(2)); B<CLD_KILLED> "
10257 "(child killed by signal); B<CLD_DUMPED> (child killed by signal, and dumped "
10258 "core); B<CLD_STOPPED> (child stopped by signal); B<CLD_TRAPPED> (traced "
10259 "child has trapped); or B<CLD_CONTINUED> (child continued by B<SIGCONT>)."
10262 #. POSIX.1-2001 leaves this possibility unspecified; most
10263 #. implementations (including Linux) zero out the structure
10264 #. in this case, but at least one implementation (AIX 5.1)
10265 #. does not -- MTK Nov 04
10266 #. type: Plain text
10267 #: build/C/man2/wait.2:354
10269 "If B<WNOHANG> was specified in I<options> and there were no children in a "
10270 "waitable state, then B<waitid>() returns 0 immediately and the state of the "
10271 "I<siginfo_t> structure pointed to by I<infop> is unspecified. To "
10272 "distinguish this case from that where a child was in a waitable state, zero "
10273 "out the I<si_pid> field before the call and check for a nonzero value in "
10274 "this field after the call returns."
10277 #. type: Plain text
10278 #: build/C/man2/wait.2:358
10280 "B<wait>(): on success, returns the process ID of the terminated child; on "
10281 "error, -1 is returned."
10284 #. type: Plain text
10285 #: build/C/man2/wait.2:367
10287 "B<waitpid>(): on success, returns the process ID of the child whose state "
10288 "has changed; if B<WNOHANG> was specified and one or more child(ren) "
10289 "specified by I<pid> exist, but have not yet changed state, then 0 is "
10290 "returned. On error, -1 is returned."
10293 #. FIXME: As reported by Vegard Nossum, if infop is NULL, then waitid()
10294 #. returns the PID of the child. Either this is a bug, or it is intended
10295 #. behavior that needs to be documented. See my Jan 2009 LKML mail
10296 #. "waitid() return value strangeness when infop is NULL".
10297 #. type: Plain text
10298 #: build/C/man2/wait.2:383
10300 "B<waitid>(): returns 0 on success or if B<WNOHANG> was specified and no "
10301 "child(ren) specified by I<id> has yet changed state; on error, -1 is "
10302 "returned. Each of these calls sets I<errno> to an appropriate value in the "
10303 "case of an error."
10307 #: build/C/man2/wait.2:384 build/C/man2/wait.2:389
10312 #. type: Plain text
10313 #: build/C/man2/wait.2:389
10315 "(for B<wait>()) The calling process does not have any unwaited-for "
10319 #. type: Plain text
10320 #: build/C/man2/wait.2:409
10322 "(for B<waitpid>() or B<waitid>()) The process specified by I<pid> "
10323 "(B<waitpid>()) or I<idtype> and I<id> (B<waitid>()) does not exist or is "
10324 "not a child of the calling process. (This can happen for one's own child if "
10325 "the action for B<SIGCHLD> is set to B<SIG_IGN>. See also the I<Linux Notes> "
10326 "section about threads.)"
10329 #. type: Plain text
10330 #: build/C/man2/wait.2:416
10332 "B<WNOHANG> was not set and an unblocked signal or a B<SIGCHLD> was caught; "
10333 "see B<signal>(7)."
10336 #. type: Plain text
10337 #: build/C/man2/wait.2:421
10338 msgid "The I<options> argument was invalid."
10341 #. type: Plain text
10342 #: build/C/man2/wait.2:436
10344 "A child that terminates, but has not been waited for becomes a \"zombie\". "
10345 "The kernel maintains a minimal set of information about the zombie process "
10346 "(PID, termination status, resource usage information) in order to allow the "
10347 "parent to later perform a wait to obtain information about the child. As "
10348 "long as a zombie is not removed from the system via a wait, it will consume "
10349 "a slot in the kernel process table, and if this table fills, it will not be "
10350 "possible to create further processes. If a parent process terminates, then "
10351 "its \"zombie\" children (if any) are adopted by B<init>(8), which "
10352 "automatically performs a wait to remove the zombies."
10355 #. type: Plain text
10356 #: build/C/man2/wait.2:477
10358 "POSIX.1-2001 specifies that if the disposition of B<SIGCHLD> is set to "
10359 "B<SIG_IGN> or the B<SA_NOCLDWAIT> flag is set for B<SIGCHLD> (see "
10360 "B<sigaction>(2)), then children that terminate do not become zombies and a "
10361 "call to B<wait>() or B<waitpid>() will block until all children have "
10362 "terminated, and then fail with I<errno> set to B<ECHILD>. (The original "
10363 "POSIX standard left the behavior of setting B<SIGCHLD> to B<SIG_IGN> "
10364 "unspecified. Note that even though the default disposition of B<SIGCHLD> is "
10365 "\"ignore\", explicitly setting the disposition to B<SIG_IGN> results in "
10366 "different treatment of zombie process children.) Linux 2.6 conforms to this "
10367 "specification. However, Linux 2.4 (and earlier) does not: if a B<wait>() "
10368 "or B<waitpid>() call is made while B<SIGCHLD> is being ignored, the call "
10369 "behaves just as though B<SIGCHLD> were not being ignored, that is, the call "
10370 "blocks until the next child terminates and then returns the process ID and "
10371 "status of that child."
10374 #. type: Plain text
10375 #: build/C/man2/wait.2:493
10377 "In the Linux kernel, a kernel-scheduled thread is not a distinct construct "
10378 "from a process. Instead, a thread is simply a process that is created using "
10379 "the Linux-unique B<clone>(2) system call; other routines such as the "
10380 "portable B<pthread_create>(3) call are implemented using B<clone>(2). "
10381 "Before Linux 2.4, a thread was just a special case of a process, and as a "
10382 "consequence one thread could not wait on the children of another thread, "
10383 "even when the latter belongs to the same thread group. However, POSIX "
10384 "prescribes such functionality, and since Linux 2.4 a thread can, and by "
10385 "default will, wait on children of other threads in the same thread group."
10388 #. type: Plain text
10389 #: build/C/man2/wait.2:500
10391 "The following Linux-specific I<options> are for use with children created "
10392 "using B<clone>(2); they cannot be used with B<waitid>():"
10396 #: build/C/man2/wait.2:500
10398 msgid "B<__WCLONE>"
10402 #. type: Plain text
10403 #: build/C/man2/wait.2:511
10405 "Wait for \"clone\" children only. If omitted then wait for \"non-clone\" "
10406 "children only. (A \"clone\" child is one which delivers no signal, or a "
10407 "signal other than B<SIGCHLD> to its parent upon termination.) This option "
10408 "is ignored if B<__WALL> is also specified."
10412 #: build/C/man2/wait.2:511
10414 msgid "B<__WALL> (since Linux 2.4)"
10417 #. since patch-2.3.48
10418 #. type: Plain text
10419 #: build/C/man2/wait.2:516
10420 msgid "Wait for all children, regardless of type (\"clone\" or \"non-clone\")."
10424 #: build/C/man2/wait.2:516
10426 msgid "B<__WNOTHREAD> (since Linux 2.4)"
10429 #. since patch-2.4.0-test8
10430 #. type: Plain text
10431 #: build/C/man2/wait.2:522
10433 "Do not wait for children of other threads in the same thread group. This "
10434 "was the default before Linux 2.4."
10437 #. fork.2 refers to this example program.
10438 #. type: Plain text
10439 #: build/C/man2/wait.2:539
10441 "The following program demonstrates the use of B<fork>(2) and B<waitpid>(). "
10442 "The program creates a child process. If no command-line argument is "
10443 "supplied to the program, then the child suspends its execution using "
10444 "B<pause>(2), to allow the user to send signals to the child. Otherwise, if "
10445 "a command-line argument is supplied, then the child exits immediately, using "
10446 "the integer supplied on the command line as the exit status. The parent "
10447 "process executes a loop that monitors the child using B<waitpid>(), and uses "
10448 "the W*() macros described above to analyze the wait status value."
10451 #. type: Plain text
10452 #: build/C/man2/wait.2:555
10456 "Child PID is 32360\n"
10458 "$B< kill -STOP 32360>\n"
10459 "stopped by signal 19\n"
10460 "$B< kill -CONT 32360>\n"
10462 "$B< kill -TERM 32360>\n"
10463 "killed by signal 15\n"
10464 "[1]+ Done ./a.out\n"
10468 #. type: Plain text
10469 #: build/C/man2/wait.2:564
10472 "#include E<lt>sys/wait.hE<gt>\n"
10473 "#include E<lt>stdlib.hE<gt>\n"
10474 "#include E<lt>unistd.hE<gt>\n"
10475 "#include E<lt>stdio.hE<gt>\n"
10478 #. type: Plain text
10479 #: build/C/man2/wait.2:570
10483 "main(int argc, char *argv[])\n"
10485 " pid_t cpid, w;\n"
10489 #. type: Plain text
10490 #: build/C/man2/wait.2:576
10493 " cpid = fork();\n"
10494 " if (cpid == -1) {\n"
10495 " perror(\"fork\");\n"
10496 " exit(EXIT_FAILURE);\n"
10500 #. type: Plain text
10501 #: build/C/man2/wait.2:582
10504 " if (cpid == 0) { /* Code executed by child */\n"
10505 " printf(\"Child PID is %ld\\en\", (long) getpid());\n"
10506 " if (argc == 1)\n"
10507 " pause(); /* Wait for signals */\n"
10508 " _exit(atoi(argv[1]));\n"
10511 #. type: Plain text
10512 #: build/C/man2/wait.2:590
10515 " } else { /* Code executed by parent */\n"
10517 " w = waitpid(cpid, &status, WUNTRACED | WCONTINUED);\n"
10518 " if (w == -1) {\n"
10519 " perror(\"waitpid\");\n"
10520 " exit(EXIT_FAILURE);\n"
10524 #. type: Plain text
10525 #: build/C/man2/wait.2:604
10528 " if (WIFEXITED(status)) {\n"
10529 " printf(\"exited, status=%d\\en\", WEXITSTATUS(status));\n"
10530 " } else if (WIFSIGNALED(status)) {\n"
10531 " printf(\"killed by signal %d\\en\", WTERMSIG(status));\n"
10532 " } else if (WIFSTOPPED(status)) {\n"
10533 " printf(\"stopped by signal %d\\en\", WSTOPSIG(status));\n"
10534 " } else if (WIFCONTINUED(status)) {\n"
10535 " printf(\"continued\\en\");\n"
10537 " } while (!WIFEXITED(status) && !WIFSIGNALED(status));\n"
10538 " exit(EXIT_SUCCESS);\n"
10543 #. type: Plain text
10544 #: build/C/man2/wait.2:617
10546 "B<_exit>(2), B<clone>(2), B<fork>(2), B<kill>(2), B<ptrace>(2), "
10547 "B<sigaction>(2), B<signal>(2), B<wait4>(2), B<pthread_create>(3), "
10548 "B<credentials>(7), B<signal>(7)"
10552 #: build/C/man2/wait4.2:34
10557 #. type: Plain text
10558 #: build/C/man2/wait4.2:37
10559 msgid "wait3, wait4 - wait for process to change state, BSD style"
10562 #. type: Plain text
10563 #: build/C/man2/wait4.2:43
10566 "B<#include E<lt>sys/types.hE<gt>>\n"
10567 "B<#include E<lt>sys/time.hE<gt>>\n"
10568 "B<#include E<lt>sys/resource.hE<gt>>\n"
10569 "B<#include E<lt>sys/wait.hE<gt>>\n"
10572 #. type: Plain text
10573 #: build/C/man2/wait4.2:46
10576 "B<pid_t wait3(int *>I<status>B<, int >I<options>B<,>\n"
10577 "B< struct rusage *>I<rusage>B<);>\n"
10580 #. type: Plain text
10581 #: build/C/man2/wait4.2:49
10584 "B<pid_t wait4(pid_t >I<pid>B<, int *>I<status>B<, int >I<options>B<,>\n"
10585 "B< struct rusage *>I<rusage>B<);>\n"
10588 #. type: Plain text
10589 #: build/C/man2/wait4.2:58
10590 msgid "B<wait3>():"
10593 #. type: Plain text
10594 #: build/C/man2/wait4.2:64
10595 msgid "B<wait4>():"
10598 #. type: Plain text
10599 #: build/C/man2/wait4.2:66
10600 msgid "_BSD_SOURCE"
10603 #. type: Plain text
10604 #: build/C/man2/wait4.2:78
10606 "The B<wait3>() and B<wait4>() system calls are similar to B<waitpid>(2), "
10607 "but additionally return resource usage information about the child in the "
10608 "structure pointed to by I<rusage>."
10611 #. type: Plain text
10612 #: build/C/man2/wait4.2:84
10614 "Other than the use of the I<rusage> argument, the following B<wait3>() "
10618 #. type: Plain text
10619 #: build/C/man2/wait4.2:87
10621 msgid " wait3(status, options, rusage);\n"
10624 #. type: Plain text
10625 #: build/C/man2/wait4.2:90 build/C/man2/wait4.2:104
10626 msgid "is equivalent to:"
10629 #. type: Plain text
10630 #: build/C/man2/wait4.2:93
10632 msgid " waitpid(-1, status, options);\n"
10635 #. type: Plain text
10636 #: build/C/man2/wait4.2:98
10637 msgid "Similarly, the following B<wait4>() call:"
10640 #. type: Plain text
10641 #: build/C/man2/wait4.2:101
10643 msgid " wait4(pid, status, options, rusage);\n"
10646 #. type: Plain text
10647 #: build/C/man2/wait4.2:107
10649 msgid " waitpid(pid, status, options);\n"
10652 #. type: Plain text
10653 #: build/C/man2/wait4.2:117
10655 "In other words, B<wait3>() waits of any child, while B<wait4>() can be "
10656 "used to select a specific child, or children, on which to wait. See "
10657 "B<wait>(2) for further details."
10660 #. type: Plain text
10661 #: build/C/man2/wait4.2:127
10663 "If I<rusage> is not NULL, the I<struct rusage> to which it points will be "
10664 "filled with accounting information about the child. See B<getrusage>(2) "
10668 #. type: Plain text
10669 #: build/C/man2/wait4.2:130 build/C/man2/wait4.2:133
10670 msgid "As for B<waitpid>(2)."
10673 #. type: Plain text
10674 #: build/C/man2/wait4.2:135
10678 #. type: Plain text
10679 #: build/C/man2/wait4.2:147
10681 "Including I<E<lt>sys/time.hE<gt>> is not required these days, but increases "
10682 "portability. (Indeed, I<E<lt>sys/resource.hE<gt>> defines the I<rusage> "
10683 "structure with fields of type I<struct timeval> defined in "
10684 "I<E<lt>sys/time.hE<gt>>.)"
10687 #. type: Plain text
10688 #: build/C/man2/wait4.2:153
10690 "On Linux, B<wait3>() is a library function implemented on top of the "
10691 "B<wait4>() system call."
10694 #. type: Plain text
10695 #: build/C/man2/wait4.2:160
10697 "B<fork>(2), B<getrusage>(2), B<sigaction>(2), B<signal>(2), B<wait>(2), "