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LDP: Update original to LDP v3.68
[linuxjm/LDP_man-pages.git]
/
original
/
man7
/
signal.7
diff --git
a/original/man7/signal.7
b/original/man7/signal.7
index
cd55cc9
..
8cc56bc
100644
(file)
--- a/
original/man7/signal.7
+++ b/
original/man7/signal.7
@@
-4,6
+4,7
@@
.\" and Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
.\" and Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
.\" <mtk.manpages@gmail.com>
.\"
+.\" %%%LICENSE_START(VERBATIM)
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
@@
-23,6
+24,7
@@
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
.\"
.\" Modified Sat Jul 24 17:34:08 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified Sun Jan 7 01:41:27 1996 by Andries Brouwer (aeb@cwi.nl)
.\"
.\" Modified Sat Jul 24 17:34:08 1993 by Rik Faith (faith@cs.unc.edu)
.\" Modified Sun Jan 7 01:41:27 1996 by Andries Brouwer (aeb@cwi.nl)
@@
-41,13
+43,13
@@
.\" Added section on stop/cont signals interrupting syscalls.
.\" 2008-10-05, mtk: various additions
.\"
.\" Added section on stop/cont signals interrupting syscalls.
.\" 2008-10-05, mtk: various additions
.\"
-.TH SIGNAL 7 201
0-09-19
"Linux" "Linux Programmer's Manual"
+.TH SIGNAL 7 201
3-07-30
"Linux" "Linux Programmer's Manual"
.SH NAME
signal \- overview of signals
.SH DESCRIPTION
Linux supports both POSIX reliable signals (hereinafter
"standard signals") and POSIX real-time signals.
.SH NAME
signal \- overview of signals
.SH DESCRIPTION
Linux supports both POSIX reliable signals (hereinafter
"standard signals") and POSIX real-time signals.
-.SS
"Signal Dispositions"
+.SS
Signal dispositions
Each signal has a current
.IR disposition ,
which determines how the process behaves when it is delivered
Each signal has a current
.IR disposition ,
which determines how the process behaves when it is delivered
@@
-100,7
+102,7
@@
During an
.BR execve (2),
the dispositions of handled signals are reset to the default;
the dispositions of ignored signals are left unchanged.
.BR execve (2),
the dispositions of handled signals are reset to the default;
the dispositions of ignored signals are left unchanged.
-.SS Sending a
S
ignal
+.SS Sending a
s
ignal
The following system calls and library functions allow
the caller to send a signal:
.TP 16
The following system calls and library functions allow
the caller to send a signal:
.TP 16
@@
-124,9
+126,9
@@
Sends a signal to a specified thread within a specific process.
(This is the system call used to implement
.BR pthread_kill (3).)
.TP
(This is the system call used to implement
.BR pthread_kill (3).)
.TP
-.BR sigqueue (
2
)
+.BR sigqueue (
3
)
Sends a real-time signal with accompanying data to a specified process.
Sends a real-time signal with accompanying data to a specified process.
-.SS Waiting for a
Signal to be C
aught
+.SS Waiting for a
signal to be c
aught
The following system calls suspend execution of the calling process
or thread until a signal is caught
(or an unhandled signal terminates the process):
The following system calls suspend execution of the calling process
or thread until a signal is caught
(or an unhandled signal terminates the process):
@@
-137,7
+139,7
@@
Suspends execution until any signal is caught.
.BR sigsuspend (2)
Temporarily changes the signal mask (see below) and suspends
execution until one of the unmasked signals is caught.
.BR sigsuspend (2)
Temporarily changes the signal mask (see below) and suspends
execution until one of the unmasked signals is caught.
-.SS Synchronously
Accepting a S
ignal
+.SS Synchronously
accepting a s
ignal
Rather than asynchronously catching a signal via a signal handler,
it is possible to synchronously accept the signal, that is,
to block execution until the signal is delivered,
Rather than asynchronously catching a signal via a signal handler,
it is possible to synchronously accept the signal, that is,
to block execution until the signal is delivered,
@@
-165,7
+167,7
@@
call is delivered to the caller.
The buffer returned by
.BR read (2)
contains a structure describing the signal.
The buffer returned by
.BR read (2)
contains a structure describing the signal.
-.SS
"Signal Mask and Pending Signals"
+.SS
Signal mask and pending signals
A signal may be
.IR blocked ,
which means that it will not be delivered until it is later unblocked.
A signal may be
.IR blocked ,
which means that it will not be delivered until it is later unblocked.
@@
-217,15
+219,17
@@
A child created via
initially has an empty pending signal set;
the pending signal set is preserved across an
.BR execve (2).
initially has an empty pending signal set;
the pending signal set is preserved across an
.BR execve (2).
-.SS
"Standard Signals"
+.SS
Standard signals
Linux supports the standard signals listed below.
Several signal numbers
are architecture-dependent, as indicated in the "Value" column.
(Where three values are given, the first one is usually valid for
alpha and sparc,
Linux supports the standard signals listed below.
Several signal numbers
are architecture-dependent, as indicated in the "Value" column.
(Where three values are given, the first one is usually valid for
alpha and sparc,
-the middle one for
ix86, ia64, ppc, s390, arm and sh
,
+the middle one for
x86, arm, and most other architectures
,
and the last one for mips.
and the last one for mips.
-.\" parisc is a law unto itself
+(Values for parisc are
+.I not
+shown; see the Linux kernel source for signal numbering on that architecture.)
A \- denotes that a signal is absent on the corresponding architecture.)
First the signals described in the original POSIX.1-1990 standard.
A \- denotes that a signal is absent on the corresponding architecture.)
First the signals described in the original POSIX.1-1990 standard.
@@
-252,9
+256,9
@@
SIGUSR2 31,12,17 Term User-defined signal 2
SIGCHLD 20,17,18 Ign Child stopped or terminated
SIGCONT 19,18,25 Cont Continue if stopped
SIGSTOP 17,19,23 Stop Stop process
SIGCHLD 20,17,18 Ign Child stopped or terminated
SIGCONT 19,18,25 Cont Continue if stopped
SIGSTOP 17,19,23 Stop Stop process
-SIGTSTP 18,20,24 Stop Stop typed at t
ty
-SIGTTIN 21,21,26 Stop
tty
input for background process
-SIGTTOU 22,22,27 Stop
tty
output for background process
+SIGTSTP 18,20,24 Stop Stop typed at t
erminal
+SIGTTIN 21,21,26 Stop
Terminal
input for background process
+SIGTTOU 22,22,27 Stop
Terminal
output for background process
.TE
The signals
.TE
The signals
@@
-306,7
+310,7
@@
SIGIO 23,29,22 Term I/O now possible (4.2BSD)
SIGCLD \-,\-,18 Ign A synonym for \fBSIGCHLD\fP
SIGPWR 29,30,19 Term Power failure (System V)
SIGINFO 29,\-,\- A synonym for \fBSIGPWR\fP
SIGCLD \-,\-,18 Ign A synonym for \fBSIGCHLD\fP
SIGPWR 29,30,19 Term Power failure (System V)
SIGINFO 29,\-,\- A synonym for \fBSIGPWR\fP
-SIGLOST \-,\-,\- Term File lock lost
+SIGLOST \-,\-,\- Term File lock lost
(unused)
SIGWINCH 28,28,20 Ign Window resize signal (4.3BSD, Sun)
SIGUNUSED \-,31,\- Core Synonymous with \fBSIGSYS\fP
.TE
SIGWINCH 28,28,20 Ign Window resize signal (4.3BSD, Sun)
SIGUNUSED \-,31,\- Core Synonymous with \fBSIGSYS\fP
.TE
@@
-339,7
+343,7
@@
is synonymous with
.\" parisc is the only exception: SIGSYS is 12, SIGUNUSED is 31
.B SIGSYS
on most architectures.
.\" parisc is the only exception: SIGSYS is 12, SIGUNUSED is 31
.B SIGSYS
on most architectures.
-.SS
"Real-time Signals"
+.SS
Real-time signals
Linux supports real-time signals as originally defined in the POSIX.1b
real-time extensions (and now included in POSIX.1-2001).
The range of supported real-time signals is defined by the macros
Linux supports real-time signals as originally defined in the POSIX.1b
real-time extensions (and now included in POSIX.1-2001).
The range of supported real-time signals is defined by the macros
@@
-375,8
+379,6
@@
does not exceed
Unlike standard signals, real-time signals have no predefined meanings:
the entire set of real-time signals can be used for application-defined
purposes.
Unlike standard signals, real-time signals have no predefined meanings:
the entire set of real-time signals can be used for application-defined
purposes.
-(Note, however, that the LinuxThreads implementation uses the first
-three real-time signals.)
.PP
The default action for an unhandled real-time signal is to terminate the
receiving process.
.PP
The default action for an unhandled real-time signal is to terminate the
receiving process.
@@
-388,13
+390,13
@@
By contrast, if multiple instances of a standard signal are delivered
while that signal is currently blocked, then only one instance is queued.
.IP 2. 4
If the signal is sent using
while that signal is currently blocked, then only one instance is queued.
.IP 2. 4
If the signal is sent using
-.BR sigqueue (
2
),
+.BR sigqueue (
3
),
an accompanying value (either an integer or a pointer) can be sent
with the signal.
If the receiving process establishes a handler for this signal using the
.B SA_SIGINFO
flag to
an accompanying value (either an integer or a pointer) can be sent
with the signal.
If the receiving process establishes a handler for this signal using the
.B SA_SIGINFO
flag to
-.BR sigaction (2)
+.BR sigaction (2)
,
then it can obtain this data via the
.I si_value
field of the
then it can obtain this data via the
.I si_value
field of the
@@
-443,7
+445,7
@@
resource limit, which specifies a per-user limit for queued
signals; see
.BR setrlimit (2)
for further details.
signals; see
.BR setrlimit (2)
for further details.
-.SS
"Async-signal-safe functions"
+.SS
Async-signal-safe functions
.PP
A signal handler function must be very careful,
since processing elsewhere may be interrupted
.PP
A signal handler function must be very careful,
since processing elsewhere may be interrupted
@@
-607,7
+609,7
@@
utimensat()
utimes()
.fi
.in
utimes()
.fi
.in
-.SS Interruption of
System Calls and Library Functions by Signal H
andlers
+.SS Interruption of
system calls and library functions by signal h
andlers
If a signal handler is invoked while a system call or library
function call is blocked, then either:
.IP * 2
If a signal handler is invoked while a system call or library
function call is blocked, then either:
.IP * 2
@@
-774,7
+776,7
@@
The
.BR sleep (3)
function is also never restarted if interrupted by a handler,
but gives a success return: the number of seconds remaining to sleep.
.BR sleep (3)
function is also never restarted if interrupted by a handler,
but gives a success return: the number of seconds remaining to sleep.
-.SS Interruption of
System Calls and Library Functions by Stop S
ignals
+.SS Interruption of
system calls and library functions by stop s
ignals
On Linux, even in the absence of signal handlers,
certain blocking interfaces can fail with the error
.BR EINTR
On Linux, even in the absence of signal handlers,
certain blocking interfaces can fail with the error
.BR EINTR
@@
-833,22
+835,25
@@
Linux 2.6.8 and earlier:
Linux 2.4 and earlier:
.BR nanosleep (2).
.RE
Linux 2.4 and earlier:
.BR nanosleep (2).
.RE
-.SH
"CONFORMING TO"
+.SH
CONFORMING TO
POSIX.1, except as noted.
POSIX.1, except as noted.
-.SH BUGS
-.B SIGIO
-and
-.B SIGLOST
-have the same value.
-The latter is commented out in the kernel source, but
-the build process of some software still thinks that
-signal 29 is
-.BR SIGLOST .
-.SH "SEE ALSO"
+.\" It must be a *very* long time since this was true:
+.\" .SH BUGS
+.\" .B SIGIO
+.\" and
+.\" .B SIGLOST
+.\" have the same value.
+.\" The latter is commented out in the kernel source, but
+.\" the build process of some software still thinks that
+.\" signal 29 is
+.\" .BR SIGLOST .
+.SH SEE ALSO
.BR kill (1),
.BR getrlimit (2),
.BR kill (2),
.BR killpg (2),
.BR kill (1),
.BR getrlimit (2),
.BR kill (2),
.BR killpg (2),
+.BR restart_syscall (2),
+.BR rt_sigqueueinfo (2),
.BR setitimer (2),
.BR setrlimit (2),
.BR sgetmask (2),
.BR setitimer (2),
.BR setrlimit (2),
.BR sgetmask (2),
@@
-858,13
+863,14
@@
signal 29 is
.BR signalfd (2),
.BR sigpending (2),
.BR sigprocmask (2),
.BR signalfd (2),
.BR sigpending (2),
.BR sigprocmask (2),
-.BR sigqueue (2),
.BR sigsuspend (2),
.BR sigwaitinfo (2),
.BR abort (3),
.BR bsd_signal (3),
.BR longjmp (3),
.BR raise (3),
.BR sigsuspend (2),
.BR sigwaitinfo (2),
.BR abort (3),
.BR bsd_signal (3),
.BR longjmp (3),
.BR raise (3),
+.BR pthread_sigqueue (3),
+.BR sigqueue (3),
.BR sigset (3),
.BR sigsetops (3),
.BR sigvec (3),
.BR sigset (3),
.BR sigsetops (3),
.BR sigvec (3),
@@
-875,3
+881,12
@@
signal 29 is
.BR proc (5),
.BR pthreads (7),
.BR sigevent (7)
.BR proc (5),
.BR pthreads (7),
.BR sigevent (7)
+.SH COLOPHON
+This page is part of release 3.68 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.
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