(split) Apply minor changes from v3.32 to v3.35 in the upstream.

[linuxjm/LDP_man-pages.git] / draft / man7 / signal.7

'\" t
.\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
.\" and Copyright (c) 2002, 2006 by Michael Kerrisk <mtk.manpages@gmail.com>
.\" and Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
.\"     <mtk.manpages@gmail.com>
.\"
.\" 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 copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date.  The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein.  The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" 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 Sun Apr 14 12:02:29 1996 by Andries Brouwer (aeb@cwi.nl)
.\" Modified Sat Nov 13 16:28:23 1999 by Andries Brouwer (aeb@cwi.nl)
.\" Modified 10 Apr 2002, by Michael Kerrisk <mtk.manpages@gmail.com>
.\" Modified  7 Jun 2002, by Michael Kerrisk <mtk.manpages@gmail.com>
.\"     Added information on real-time signals
.\" Modified 13 Jun 2002, by Michael Kerrisk <mtk.manpages@gmail.com>
.\"     Noted that SIGSTKFLT is in fact unused
.\" 2004-12-03, Modified mtk, added notes on RLIMIT_SIGPENDING
.\" 2006-04-24, mtk, Added text on changing signal dispositions,
.\"             signal mask, and pending signals.
.\" 2008-07-04, mtk:
.\"     Added section on system call restarting (SA_RESTART)
.\"     Added section on stop/cont signals interrupting syscalls.
.\" 2008-10-05, mtk: various additions
.\"
.\" Japanese Version Copyright (c) 1997 Takafumi Naka
.\"     and 2005-2008 Akihiro MOTOKI
.\"         all rights reserved.
.\" Translated 1997-02-13, Takafumi Naka <takafumi@yk.rim.or.jp>
.\" Modified 1999-06-22, Tatsuo SEKINE <tsekine@isoternet.org>
.\" Modified 1999-07-18, Takafumi Naka <takafumi@yk.rim.or.jp>
.\" Modified 1999-12-06, NAKANO Takeo <nakano@apm.seikei.ac.jp>, LDP v1.28
.\" Updated 2003-07-24, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-02-23, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2006-07-28, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.36
.\" Updated 2007-05-28, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.50
.\" Updated 2007-09-08, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.64
.\" Updated 2008-08-11, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.05
.\" Updated 2008-11-21, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.13
.\" Updated 2010-04-10, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v3.24
.\"
.\"WORD:        disposition     ½èÍýÊýË¡
.\"WORD:        pending         ½èÍýÂÔ¤Á
.\"WORD:        signal handler  ¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é
.\"
.TH SIGNAL 7  2011-09-18 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.\"O signal \- overview of signals
.SH ̾Á°
signal \- ¥·¥°¥Ê¥ë¤Î³µÍ×
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O Linux supports both POSIX reliable signals (hereinafter
.\"O "standard signals") and POSIX real-time signals.
Linux ¤Ï POSIX ¿®Íꥷ¥°¥Ê¥ë (reliable signal; °Ê¸å "ɸ½à¥·¥°¥Ê¥ë"¤Èɽµ­)
¤È POSIX ¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ÎξÊý¤ËÂбþ¤·¤Æ¤¤¤ë¡£
.\"O .SS "Signal Dispositions"
.SS ¥·¥°¥Ê¥ë½èÍýÊýË¡
.\"O Each signal has a current
.\"O .IR disposition ,
.\"O which determines how the process behaves when it is delivered
.\"O the signal.
¥·¥°¥Ê¥ë¤Ï¤½¤ì¤¾¤ì¸½ºß¤Î¡Ö½èÍýÊýË¡ (disposition)¡×¤òÊÝ»ý¤·¤Æ¤ª¤ê¡¢
¤³¤Î½èÍýÊýË¡¤Ë¤è¤ê¥·¥°¥Ê¥ë¤¬ÇÛÁ÷¤µ¤ì¤¿ºÝ¤Ë¥×¥í¥»¥¹¤¬
¤É¤Î¤è¤¦¤Ê¿¶Éñ¤¤¤ò¤¹¤ë¤«¤¬·è¤Þ¤ë¡£

.\"O The entries in the "Action" column of the tables below specify
.\"O the default disposition for each signal, as follows:
¸å½Ò¤Îɽ¤Î "Æ°ºî" ¤ÎÍó¤Î¥¨¥ó¥È¥ê¤Ï³Æ¥·¥°¥Ê¥ë¤Î¥Ç¥Õ¥©¥ë¥È¤Î
½èÍýÊýË¡¤ò¼¨¤·¤Æ¤ª¤ê¡¢°Ê²¼¤Î¤è¤¦¤Ê°ÕÌ£¤ò»ý¤Ä¡£
.IP Term
.\"O Default action is to terminate the process.
¥Ç¥Õ¥©¥ë¥È¤ÎÆ°ºî¤Ï¥×¥í¥»¥¹½ªÎ»¡£
.IP Ign
.\"O Default action is to ignore the signal.
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.IP Core
.\"O Default action is to terminate the process and dump core (see
.\"O .BR core (5)).
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.RB ( core (5)
»²¾È)¡£
.IP Stop
.\"O Default action is to stop the process.
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.IP Cont
.\"O Default action is to continue the process if it is currently stopped.
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.PP
.\"O A process can change the disposition of a signal using
.\"O .BR sigaction (2)
.\"O or
.\"O .BR signal (2).
.\"O (The latter is less portable when establishing a signal handler;
.\"O see
.\"O .BR signal (2)
.\"O for details.)
¥×¥í¥»¥¹¤Ï¡¢
.BR sigaction (2)
¤ä
.BR signal (2)
¤ò»È¤Ã¤Æ¡¢¥·¥°¥Ê¥ë¤Î½èÍýÊýË¡¤òÊѹ¹¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë
.RB ( signal (2)
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¾ÜºÙ¤Ï
.BR signal (2)
¤ò»²¾È)¡£
.\"O Using these system calls, a process can elect one of the
.\"O following behaviors to occur on delivery of the signal:
.\"O perform the default action; ignore the signal;
.\"O or catch the signal with a
.\"O .IR "signal handler" ,
.\"O a programmer-defined function that is automatically invoked
.\"O when the signal is delivered.
.\"O (By default, the signal handler is invoked on the
.\"O normal process stack.
.\"O It is possible to arrange that the signal handler
.\"O uses an alternate stack; see
.\"O .BR sigaltstack (2)
.\"O for a discussion of how to do this and when it might be useful.)
¥·¥°¥Ê¥ë¤ÎÇÛÁ÷»þ¤Ëµ¯¤³¤ëÆ°ºî¤È¤·¤Æ
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.I "¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é (signal handler)"
¤Ç¥·¥°¥Ê¥ë¤òÊ᪤¹¤ë¡£¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤È¤Ï¡¢¥·¥°¥Ê¥ëÇÛÁ÷»þ¤Ë
¼«Æ°Åª¤Ëµ¯Æ°¤µ¤ì¤ë¥×¥í¥°¥é¥ÞÄêµÁ¤Î´Ø¿ô¤Ç¤¢¤ë¡£
(¥Ç¥Õ¥©¥ë¥È¤Ç¤Ï¡¢¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤ÏÄ̾ï¤Î¥×¥í¥»¥¹¤Î¥¹¥¿¥Ã¥¯¾å¤Çµ¯Æ°¤µ¤ì¤ë¡£
¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤¬ÂåÂØ¥¹¥¿¥Ã¥¯ (alternate stack) ¤ò»ÈÍѤ¹¤ë¤è¤¦¤ËÀßÄꤹ¤ë
¤³¤È¤â¤Ç¤­¤ë¡£ÂåÂØ¥¹¥¿¥Ã¥¯¤ò»ÈÍѤ¹¤ë¤è¤¦¤ËÀßÄꤹ¤ëÊýË¡¤È¡¢¤É¤Î¤è¤¦¤ÊºÝ¤Ë
ÂåÂØ¥¹¥¿¥Ã¥¯¤¬Ìò¤ËΩ¤Ä¤«¤Ë¤Ä¤¤¤Æ¤ÎµÄÏÀ¤Ë¤Ä¤¤¤Æ¤Ï
.BR sigaltstack (2)
¤ò»²¾È¤Î¤³¤È¡£

.\"O The signal disposition is a per-process attribute:
.\"O in a multithreaded application, the disposition of a
.\"O particular signal is the same for all threads.
¥·¥°¥Ê¥ë¤Î½èÍýÊýË¡¤Ï¥×¥í¥»¥¹Ã±°Ì¤Î°À­¤Ç¤¢¤ë¡£
¥Þ¥ë¥Á¥¹¥ì¥Ã¥É¤Î¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ç¤Ï¡¢¤¢¤ë¥·¥°¥Ê¥ë¤Î½èÍýÊýË¡¤Ï
Á´¤Æ¤Î¥¹¥ì¥Ã¥É¤ÇƱ¤¸¤Ç¤¢¤ë¡£

.\"O A child created via
.\"O .BR fork (2)
.\"O inherits a copy of its parent's signal dispositions.
.\"O During an
.\"O .BR execve (2),
.\"O the dispositions of handled signals are reset to the default;
.\"O the dispositions of ignored signals are left unchanged.
.BR fork (2)
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.BR execve (2)
¤Î´Ö¡¢¥Ï¥ó¥É¥é¤¬ÅÐÏ¿¤µ¤ì¤Æ¤¤¤ë¥·¥°¥Ê¥ë¤Î½èÍýÊýË¡¤Ï¥Ç¥Õ¥©¥ë¥È¤Ë¥ê¥»¥Ã¥È
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.\"O .SS Sending a Signal
.SS ¥·¥°¥Ê¥ë¤ÎÁ÷¿®
.\"O The following system calls and library functions allow
.\"O the caller to send a signal:
°Ê²¼¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤È¥é¥¤¥Ö¥é¥ê´Ø¿ô¤ò»È¤Ã¤Æ¡¢
¸Æ¤Ó½Ð¤·¼Ô¤Ï¥·¥°¥Ê¥ë¤òÁ÷¿®¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
.TP 16
.BR raise (3)
.\"O Sends a signal to the calling thread.
¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Ë¥·¥°¥Ê¥ë¤òÁ÷¤ë¡£
.TP
.BR kill (2)
.\"O Sends a signal to a specified process,
.\"O to all members of a specified process group,
.\"O or to all processes on the system.
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¥·¥¹¥Æ¥à¤ÎÁ´¥×¥í¥»¥¹¤Ë¥·¥°¥Ê¥ë¤òÁ÷¤ë¡£
.TP
.BR killpg (2)
.\"O Sends a signal to all of the members of a specified process group.
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.TP
.BR pthread_kill (3)
.\"O Sends a signal to a specified POSIX thread in the same process as
.\"O the caller.
¸Æ¤Ó½Ð¤·¼Ô¤ÈƱ¤¸¥×¥í¥»¥¹Æâ¤Î»ØÄꤵ¤ì¤¿ POSIX ¥¹¥ì¥Ã¥É¤Ë¥·¥°¥Ê¥ë¤òÁ÷¤ë¡£
.TP
.BR tgkill (2)
.\"O Sends a signal to a specified thread within a specific process.
.\"O (This is the system call used to implement
.\"O .BR pthread_kill (3).)
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(¤³¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤ò»È¤Ã¤Æ
.BR pthread_kill (3)
¤Ï¼ÂÁõ¤µ¤ì¤Æ¤¤¤ë)¡£
.TP
.BR sigqueue (3)
.\"O Sends a real-time signal with accompanying data to a specified process.
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.\"O .SS Waiting for a Signal to be Caught
.SS ¥·¥°¥Ê¥ë¤¬Ê᪤µ¤ì¤ë¤Î¤òÂÔ¤Ä
.\"O The following system calls suspend execution of the calling process
.\"O or thread until a signal is caught
.\"O (or an unhandled signal terminates the process):
°Ê²¼¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤ò»È¤Ã¤Æ¡¢¥·¥°¥Ê¥ë¤¬Ê᪤µ¤ì¤ë¤Þ¤Ç
¸Æ¤Ó½Ð¤·¤¿¥×¥í¥»¥¹¤ä¥¹¥ì¥Ã¥É¤Î¼Â¹Ô¤òÃæÃÇ (suspend) ¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë
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¾ì¹ç¤Ë¤â¼Â¹Ô¤ÎÄä»ß¤Ï½ªÎ»¤¹¤ë)¡£
.TP 16
.BR pause (2)
.\"O Suspends execution until any signal is caught.
²¿¤«¥·¥°¥Ê¥ë¤¬Ê᪤µ¤ì¤ë¤Þ¤Ç¼Â¹Ô¤òÄä»ß¤¹¤ë¡£
.TP
.BR sigsuspend (2)
.\"O Temporarily changes the signal mask (see below) and suspends
.\"O execution until one of the unmasked signals is caught.
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¥Þ¥¹¥¯¤µ¤ì¤Æ¤¤¤Ê¤¤¥·¥°¥Ê¥ë¤Î¤¤¤º¤ì¤«¤¬Ê᪤µ¤ì¤ë¤Þ¤Ç
¼Â¹Ô¤òÃæÃǤ¹¤ë¡£
.\"O .SS Synchronously Accepting a Signal
.SS ¥·¥°¥Ê¥ë¤ÎƱ´ü¼õ¿®
.\"O Rather than asynchronously catching a signal via a signal handler,
.\"O it is possible to synchronously accept the signal, that is,
.\"O to block execution until the signal is delivered,
.\"O at which point the kernel returns information about the
.\"O signal to the caller.
.\"O There are two general ways to do this:
¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é·Ðͳ¤Ç¥·¥°¥Ê¥ë¤òÈóƱ´ü (asynchronously) ¤ÇÊ᪤¹¤ë°Ê³°¤Ë¤â¡¢
¥·¥°¥Ê¥ë¤òƱ´ü (synchronously) ¤·¤Æ¼õ¤±ÉÕ¤±¤ë¤³¤È¤â¤Ç¤­¤ë¡£
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¤³¤ì¤ò¹Ô¤¦°ìÈÌŪ¤ÊÊýË¡¤¬Æó¤Ä¤¢¤ë¡£
.IP * 2
.\"O .BR sigwaitinfo (2),
.\"O .BR sigtimedwait (2),
.\"O and
.\"O .BR sigwait (3)
.\"O suspend execution until one of the signals in a specified
.\"O set is delivered.
.\"O Each of these calls returns information about the delivered signal.
.BR sigwaitinfo (2),
.BR sigtimedwait (2),
.BR sigwait (3)
¤Ï¡¢»ØÄꤵ¤ì¤¿¥·¥°¥Ê¥ë½¸¹ç¤Î¥·¥°¥Ê¥ë¤Î°ì¤Ä¤¬ÇÛÁ÷¤µ¤ì¤ë¤Þ¤Ç¼Â¹Ô¤òÃæÃǤ¹¤ë¡£
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.IP *
.\"O .BR signalfd (2)
.\"O returns a file descriptor that can be used to read information
.\"O about signals that are delivered to the caller.
.\"O Each
.\"O .BR read (2)
.\"O from this file descriptor blocks until one of the signals
.\"O in the set specified in the
.\"O .BR signalfd (2)
.\"O call is delivered to the caller.
.\"O The buffer returned by
.\"O .BR read (2)
.\"O contains a structure describing the signal.
.BR signalfd (2)
¤¬ÊÖ¤¹¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤ò»È¤¦¤È¡¢¸Æ¤Ó½Ð¤·¸µ¤ËÇÛÁ÷¤µ¤ì¤¿
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.BR read (2)
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.BR signalfd (2)
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ÇÛÁ÷¤µ¤ì¤ë¤Þ¤ÇÄä»ß (block) ¤¹¤ë¡£
.BR read (2)
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.\"O .SS "Signal Mask and Pending Signals"
.SS ¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤È½èÍýÂÔ¤Á¥·¥°¥Ê¥ë
.\"O A signal may be
.\"O .IR blocked ,
.\"O which means that it will not be delivered until it is later unblocked.
.\"O Between the time when it is generated and when it is delivered
.\"O a signal is said to be
.\"O .IR pending .
¥·¥°¥Ê¥ë¤Ï
.I "¥Ö¥í¥Ã¥¯ (block)"
¤µ¤ì¤ë¤³¤È¤¬¤¢¤ë¡£¥Ö¥í¥Ã¥¯¤µ¤ì¤ë¤È¡¢¤½¤Î¥·¥°¥Ê¥ë¤Ï
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.I "½èÍýÂÔ¤Á (pending)"
¤Ç¤¢¤ë¤È¸Æ¤Ð¤ì¤ë¡£

.\"O Each thread in a process has an independent
.\"O .IR "signal mask" ,
.\"O which indicates the set of signals that the thread is currently blocking.
.\"O A thread can manipulate its signal mask using
.\"O .BR pthread_sigmask (3).
.\"O In a traditional single-threaded application,
.\"O .BR sigprocmask (2)
.\"O can be used to manipulate the signal mask.
¥×¥í¥»¥¹Æâ¤Î³Æ¥¹¥ì¥Ã¥É¤Ï¡¢¤½¤ì¤¾¤ìÆÈΩ¤Ê
.I "¥·¥°¥Ê¥ë¥Þ¥¹¥¯ (signal mask)"
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.BR pthread_sigmask (3)
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ÅÁÅýŪ¤Ê¥·¥ó¥°¥ë¥¹¥ì¥Ã¥É¤Î¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ç¤Ï¡¢
.BR sigprocmask (2)
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.\"O A child created via
.\"O .BR fork (2)
.\"O inherits a copy of its parent's signal mask;
.\"O the signal mask is preserved across
.\"O .BR execve (2).
.BR fork (2)
·Ðͳ¤ÇºîÀ®¤µ¤ì¤¿»Ò¥×¥í¥»¥¹¤Ï¡¢
¿Æ¥×¥í¥»¥¹¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤Î¥³¥Ô¡¼¤ò·Ñ¾µ¤¹¤ë¡£
.BR execve (2)
¤ÎÁ°¸å¤Ç¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤ÏÊÝ»ý¤µ¤ì¤ë¡£

.\"O A signal may be generated (and thus pending)
.\"O for a process as a whole (e.g., when sent using
.\"O .BR kill (2))
.\"O or for a specific thread (e.g., certain signals,
.\"O such as
.\"O .B SIGSEGV
.\"O and
.\"O .BR SIGFPE ,
.\"O generated as a
.\"O consequence of executing a specific machine-language instruction
.\"O are thread directed, as are signals targeted at a specific thread using
.\"O .BR pthread_kill (3)).
.\"O A process-directed signal may be delivered to any one of the
.\"O threads that does not currently have the signal blocked.
.\"O If more than one of the threads has the signal unblocked, then the
.\"O kernel chooses an arbitrary thread to which to deliver the signal.
À¸À®¤µ¤ì¤ë¥·¥°¥Ê¥ë (¤·¤¿¤¬¤Ã¤Æ½èÍýÂÔ¤Á¤È¤Ê¤ë¥·¥°¥Ê¥ë) ¤Ë¤Ï¡¢
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Î㤨¤Ð¡¢¥×¥í¥»¥¹Á´Âΰ¸¤Æ¤Î¥·¥°¥Ê¥ë¤Ï
.BR kill (2)
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ÆÃÄê¤Î¥Þ¥·¥ó¸ì¤ÎÌ¿Îá¤Î¼Â¹Ô¤Î·ë²Ì¤È¤·¤ÆÀ¸À®¤µ¤ì¤ë¡¢
.B SIGSEGV
¤ä
.B SIGFPE
¤Ê¤É¤Î¥·¥°¥Ê¥ë¤Ï¡¢¥¹¥ì¥Ã¥É°¸¤Æ¤È¤Ê¤ë¡£
¤Þ¤¿¡¢
.BR pthread_kill (3)
¤ò»È¤Ã¤ÆÆÃÄê¤Î¥¹¥ì¥Ã¥É°¸¤Æ¤ËÀ¸À®¤µ¤ì¤¿¥·¥°¥Ê¥ë¤â
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¤¤¤º¤ì¤«¤Î°ì¤Ä¤ËÇÛÁ÷¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£¤½¤Î¥·¥°¥Ê¥ë¤ò¥Ö¥í¥Ã¥¯¤·¤Æ¤¤¤Ê¤¤
¥¹¥ì¥Ã¥É¤¬Ê£¿ô¤¢¤ë¾ì¹ç¡¢¥·¥°¥Ê¥ë¤òÇÛÁ÷¤¹¤ë¥¹¥ì¥Ã¥É¤Ï¥«¡¼¥Í¥ë¤¬
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.\"O A thread can obtain the set of signals that it currently has pending
.\"O using
.\"O .BR sigpending (2).
.\"O This set will consist of the union of the set of pending
.\"O process-directed signals and the set of signals pending for
.\"O the calling thread.
¥¹¥ì¥Ã¥É¤Ï¡¢
.BR sigpending (2)
¤ò»È¤Ã¤Æ¡¢¸½ºß½èÍýÂÔ¤Á¤Î¥·¥°¥Ê¥ë½¸¹ç¤ò¼èÆÀ¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
¤³¤Î½¸¹ç¤Ï¡¢¥×¥í¥»¥¹°¸¤Æ¤Î½èÍýÂÔ¤Á¥·¥°¥Ê¥ë¤È
¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É°¸¤Æ¤Î¥·¥°¥Ê¥ë¤ÎξÊý¤«¤é¹½À®¤µ¤ì¤ë¡£

.\"O A child created via
.\"O .BR fork (2)
.\"O initially has an empty pending signal set;
.\"O the pending signal set is preserved across an
.\"O .BR execve (2).
.BR fork (2)
·Ðͳ¤ÇºîÀ®¤µ¤ì¤¿»Ò¥×¥í¥»¥¹¤Ç¤Ï¡¢½èÍýÂÔ¤Á¤Î¥·¥°¥Ê¥ë½¸¹ç¤Ï
¶õ¤Î½¸¹ç¤Ç½é´ü²½¤µ¤ì¤ë¡£
.BR execve (2)
¤ÎÁ°¸å¤Ç¡¢½èÍýÂÔ¤Á¤Î¥·¥°¥Ê¥ë½¸¹ç¤ÏÊÝ»ý¤µ¤ì¤ë¡£
.\"O .SS "Standard Signals"
.SS ɸ½à¥·¥°¥Ê¥ë
.\"O Linux supports the standard signals listed below.
.\"O Several signal numbers
.\"O are architecture-dependent, as indicated in the "Value" column.
.\"O (Where three values are given, the first one is usually valid for
.\"O alpha and sparc,
.\"O the middle one for ix86, ia64, ppc, s390, arm and sh,
.\"O and the last one for mips.
Linux ¤Ï°Ê²¼¤Ë¼¨¤¹É¸½à¥·¥°¥Ê¥ë¤ËÂбþ¤·¤Æ¤¤¤ë¡£
¥·¥°¥Ê¥ëÈÖ¹æ¤Î°ìÉô¤Ï¥¢¡¼¥­¥Æ¥¯¥Á¥ã°Í¸¤Ç¤¢¤ê¡¢"ÃÍ" Íó¤Ë¼¨¤¹Ä̤ê¤Ç¤¢¤ë¡£
(3¤Ä¤ÎÃͤ¬½ñ¤«¤ì¤Æ¤¤¤ë¤â¤Î¤Ï¡¢ 1¤ÄÌܤ¬ alpha ¤È sparc ¤ÇÄ̾ïÍ­¸ú¤ÊÃÍ¡¢
¿¿¤óÃ椬 ix86, ia64, ppc, s390, arm, sh ¤Ç¤ÎÃÍ¡¢ºÇ¸å¤¬ mips ¤Ç¤ÎÃͤǤ¢¤ë¡£
.\" parisc is a law unto itself
.\"O A \- denotes that a signal is absent on the corresponding architecture.)
\- ¤Ï¤½¤Î¥¢¡¼¥­¥Æ¥¯¥Á¥ã¤Ë¤ª¤¤¤ÆÂбþ¤¹¤ë¥·¥°¥Ê¥ë¤¬¤Ê¤¤¤³¤È¤ò¼¨¤¹¡£)

.\"O First the signals described in the original POSIX.1-1990 standard.
ºÇ½é¤Ë¡¢POSIX.1-1990 ¤ËÄêµÁ¤µ¤ì¤Æ¤¤¤ë¥·¥°¥Ê¥ë¤ò¼¨¤¹¡£
.TS
l c c l
____
lB c c l.
.\"O Signal     Value   Action  Comment
¥·¥°¥Ê¥ë        ÃÍ      Æ°ºî    ¥³¥á¥ó¥È
.\"O SIGHUP     \01     Term    Hangup detected on controlling terminal
.\"O                    or death of controlling process
SIGHUP  \01     Term    T{
À©¸æüËö(controlling terminal)¤Î¥Ï¥ó¥°¥¢¥Ã¥×¸¡½Ð¡¢
¤Þ¤¿¤ÏÀ©¸æ¤·¤Æ¤¤¤ë¥×¥í¥»¥¹¤Î»à
T}
.\"O SIGINT     \02     Term    Interrupt from keyboard
.\"O SIGQUIT    \03     Core    Quit from keyboard
.\"O SIGILL     \04     Core    Illegal Instruction
.\"O SIGABRT    \06     Core    Abort signal from \fBabort\fP(3)
.\"O SIGFPE     \08     Core    Floating point exception
.\"O SIGKILL    \09     Term    Kill signal
SIGINT  \02     Term    ¥­¡¼¥Ü¡¼¥É¤«¤é¤Î³ä¤ê¹þ¤ß (Interrupt)
SIGQUIT \03     Core    ¥­¡¼¥Ü¡¼¥É¤Ë¤è¤ëÃæ»ß (Quit)
SIGILL  \04     Core    ÉÔÀµ¤ÊÌ¿Îá
SIGABRT \06     Core    \fBabort\fP(3) ¤«¤é¤ÎÃæÃÇ (Abort) ¥·¥°¥Ê¥ë
SIGFPE  \08     Core    ÉâÆ°¾®¿ôÅÀÎã³°
SIGKILL \09     Term    Kill ¥·¥°¥Ê¥ë
.\"O SIGSEGV    11      Core    Invalid memory reference
.\"O SIGPIPE    13      Term    Broken pipe: write to pipe with no
.\"O                    readers
.\"O SIGALRM    14      Term    Timer signal from \fBalarm\fP(2)
.\"O SIGTERM    15      Term    Termination signal
SIGSEGV 11      Core    ÉÔÀµ¤Ê¥á¥â¥ê»²¾È
SIGPIPE 13      Term    ¥Ñ¥¤¥×Ç˲õ: Æɤ߼ê¤Î̵¤¤¥Ñ¥¤¥×¤Ø¤Î½ñ¤­½Ð¤·
SIGALRM 14      Term    \fBalarm\fP(2) ¤«¤é¤Î¥¿¥¤¥Þ¡¼¥·¥°¥Ê¥ë
SIGTERM 15      Term    ½ªÎ» (termination) ¥·¥°¥Ê¥ë
.\"O SIGUSR1    30,10,16        Term    User-defined signal 1
.\"O SIGUSR2    31,12,17        Term    User-defined signal 2
.\"O SIGCHLD    20,17,18        Ign     Child stopped or terminated
.\"O SIGCONT    19,18,25        Cont    Continue if stopped
SIGUSR1 30,10,16        Term    ¥æ¡¼¥¶ÄêµÁ¥·¥°¥Ê¥ë 1
SIGUSR2 31,12,17        Term    ¥æ¡¼¥¶ÄêµÁ¥·¥°¥Ê¥ë 2
SIGCHLD 20,17,18        Ign     »Ò¥×¥í¥»¥¹¤Î°ì»þÄä»ß (stop) ¤Þ¤¿¤Ï½ªÎ»
SIGCONT 19,18,25        Cont    °ì»þÄä»ß (stop) ¤«¤é¤ÎºÆ³«
.\"O SIGSTOP    17,19,23        Stop    Stop process
.\"O SIGTSTP    18,20,24        Stop    Stop typed at tty
.\"O SIGTTIN    21,21,26        Stop    tty input for background process
.\"O SIGTTOU    22,22,27        Stop    tty output for background process
SIGSTOP 17,19,23        Stop    ¥×¥í¥»¥¹¤Î°ì»þÄä»ß (stop)
SIGTSTP 18,20,24        Stop    üËö (tty) ¤è¤êÆþÎϤµ¤ì¤¿°ì»þÄä»ß (stop)
SIGTTIN 21,21,26        Stop    ¥Ð¥Ã¥¯¥°¥é¥ó¥É¥×¥í¥»¥¹¤Î tty ÆþÎÏ
SIGTTOU 22,22,27        Stop    ¥Ð¥Ã¥¯¥°¥é¥ó¥É¥×¥í¥»¥¹¤Î tty ½ÐÎÏ
.TE

.\"O The signals
.\"O .B SIGKILL
.\"O and
.\"O .B SIGSTOP
.\"O cannot be caught, blocked, or ignored.
¥·¥°¥Ê¥ë
.B SIGKILL
¤È
.B SIGSTOP
¤Ï¥­¥ã¥Ã¥Á¡¢¥Ö¥í¥Ã¥¯¡¢Ìµ»ë¤Ç¤­¤Ê¤¤¡£

.\"O Next the signals not in the POSIX.1-1990 standard but described in
.\"O SUSv2 and POSIX.1-2001.
¼¡¤Ë¡¢ POSIX.1-1990 ɸ½à¤Ë¤Ï¤Ê¤¤¤¬¡¢ SUSv2 ¤È
POSIX.1-2001 ¤Ëµ­½Ò¤µ¤ì¤Æ¤¤¤ë¥·¥°¥Ê¥ë¤ò¼¨¤¹¡£
.TS
l c c l
____
lB c c l.
.\"O Signal     Value   Action  Comment
¥·¥°¥Ê¥ë        ÃÍ      Æ°ºî    ¥³¥á¥ó¥È
.\"O SIGBUS     10,7,10 Core    Bus error (bad memory access)
.\"O SIGPOLL            Term    Pollable event (Sys V).
.\"O                    Synonym for \fBSIGIO\fP
.\"O SIGPROF    27,27,29        Term    Profiling timer expired
SIGBUS  10,7,10 Core    ¥Ð¥¹¥¨¥é¡¼ (ÉÔÀµ¤Ê¥á¥â¥ê¥¢¥¯¥»¥¹)
SIGPOLL         Term    ¥Ý¡¼¥ê¥ó¥°²Äǽ¤Ê¥¤¥Ù¥ó¥È (Sys V)¡£
                        \fBSIGIO\fP ¤ÈƱµÁ
SIGPROF 27,27,29        Term    profiling ¥¿¥¤¥Þ¤Î»þ´ÖÀÚ¤ì
.\"O SIGSYS     12,31,12        Core    Bad argument to routine (SVr4)
.\"O SIGTRAP    5       Core    Trace/breakpoint trap
.\"O SIGURG     16,23,21        Ign     Urgent condition on socket (4.2BSD)
SIGSYS  12,31,12        Core    ¥ë¡¼¥Á¥ó¤Ø¤Î°ú¤­¿ô¤¬ÉÔÀµ (SVr4)
SIGTRAP 5       Core    ¥È¥ì¡¼¥¹/¥Ö¥ì¡¼¥¯¥Ý¥¤¥ó¥È ¥È¥é¥Ã¥×
SIGURG  16,23,21        Ign     T{
¥½¥±¥Ã¥È¤Î¶ÛµÞ»öÂÖ (urgent condition) (4.2BSD)
T}
.\"O SIGVTALRM  26,26,28        Term    Virtual alarm clock (4.2BSD)
.\"O SIGXCPU    24,24,30        Core    CPU time limit exceeded (4.2BSD)
.\"O SIGXFSZ    25,25,31        Core    File size limit exceeded (4.2BSD)
SIGVTALRM       26,26,28        Term    ²¾ÁÛ¥¢¥é¡¼¥à¥¯¥í¥Ã¥¯ (4.2BSD)
SIGXCPU 24,24,30        Core    CPU»þ´ÖÀ©¸ÂĶ²á (4.2BSD)
SIGXFSZ 25,25,31        Core    ¥Õ¥¡¥¤¥ë¥µ¥¤¥ºÀ©¸Â¤ÎĶ²á (4.2BSD)
.TE

.\"O Up to and including Linux 2.2, the default behavior for
.\"O .BR SIGSYS ", " SIGXCPU ", " SIGXFSZ ", "
.\"O and (on architectures other than SPARC and MIPS)
.\"O .B SIGBUS
.\"O was to terminate the process (without a core dump).
.\"O (On some other UNIX systems the default action for
.\"O .BR SIGXCPU " and " SIGXFSZ
.\"O is to terminate the process without a core dump.)
.\"O Linux 2.4 conforms to the POSIX.1-2001 requirements for these signals,
.\"O terminating the process with a core dump.
Linux 2.2 °ÊÁ°¤Ç¤Ï¡¢
.BR SIGSYS ", " SIGXCPU ", " SIGXFSZ
¤ª¤è¤Ó SPARC ¤È MIPS °Ê³°¤Î¥¢¡¼¥­¥Æ¥¯¥Á¥ã¤Ç¤Î
.B SIGBUS
¤Î¥Ç¥Õ¥©¥ë¥È¤Î¿¶¤ëÉñ¤¤¤Ï (¥³¥¢¥À¥ó¥×½ÐÎϤʤ·¤Î) ¥×¥í¥»¥¹½ªÎ»¤Ç¤¢¤Ã¤¿¡£
(¾¤Î UNIX ¥·¥¹¥Æ¥à¤Ë¤â
.BR SIGXCPU " ¤È " SIGXFSZ
¤Î¥Ç¥Õ¥©¥ë¥È¤ÎÆ°ºî¤¬¥³¥¢¥À¥ó¥×¤Ê¤·¤Î¥×¥í¥»¥¹½ªÎ»¤Î¤â¤Î¤¬¤¢¤ë¡£)
Linux 2.4 ¤Ç¤Ï¡¢POSIX.1-2001 ¤Ç¤ÎÍ×µá»ÅÍͤ˽àµò¤·¤Æ¡¢
¤³¤ì¤é¤Î¥·¥°¥Ê¥ë¤Ç¡¢¥×¥í¥»¥¹¤ò½ªÎ»¤µ¤»¡¢¥³¥¢¥À¥ó¥×¤ò½ÐÎϤ¹¤ë
¤è¤¦¤Ë¤Ê¤Ã¤Æ¤¤¤ë¡£

.\"O Next various other signals.
¼¡¤Ë¤½¤Î¾¤Î³Æ¼ï¥·¥°¥Ê¥ë¤ò¼¨¤¹¡£
.TS
l c c l
____
lB c c l.
.\"O Signal     Value   Action  Comment
¥·¥°¥Ê¥ë        ÃÍ      Æ°ºî    ¥³¥á¥ó¥È
.\"O SIGIOT     6       Core    IOT trap. A synonym for \fBSIGABRT\fP
.\"O SIGEMT     7,\-,7  Term
.\"O SIGSTKFLT  \-,16,\-        Term    Stack fault on coprocessor (unused)
.\"O SIGIO      23,29,22        Term    I/O now possible (4.2BSD)
.\"O SIGCLD     \-,\-,18        Ign     A synonym for \fBSIGCHLD\fP
SIGIOT  6       Core    IOT ¥È¥é¥Ã¥×¡£\fBSIGABRT\fP ¤ÈƱµÁ
SIGEMT  7,\-,7  Term
SIGSTKFLT       \-,16,\-        A       T{
¿ôÃͱ黻¥×¥í¥»¥Ã¥µ¤Ë¤ª¤±¤ë¥¹¥¿¥Ã¥¯¥Õ¥©¥ë¥È (̤»ÈÍÑ)
T}
SIGIO   23,29,22        Term    Æþ½ÐÎϤ¬²Äǽ¤Ë¤Ê¤Ã¤¿ (4.2BSD)
SIGCLD  \-,\-,18        Ign     \fBSIGCHLD\fP ¤ÈƱµÁ
.\"O SIGPWR     29,30,19        Term    Power failure (System V)
.\"O SIGINFO    29,\-,\-                A synonym for \fBSIGPWR\fP
.\"O SIGLOST    \-,\-,\-        Term    File lock lost
.\"O SIGWINCH   28,28,20        Ign     Window resize signal (4.3BSD, Sun)
.\"O SIGUNUSED  \-,31,\-        Core    Synonymous with \fBSIGSYS\fP
SIGPWR  29,30,19        Term    ÅŸ»ÁÓ¼º (Power failure) (System V)
SIGINFO 29,\-,\-                \fBSIGPWR\fP ¤ÈƱµÁ
SIGLOST \-,\-,\-        Term    ¥Õ¥¡¥¤¥ë¥í¥Ã¥¯¤¬¼º¤ï¤ì¤¿
SIGWINCH        28,28,20        Ign     T{
¥¦¥£¥ó¥É¥¦ ¥ê¥µ¥¤¥º ¥·¥°¥Ê¥ë (4.3BSD, Sun)
T}
SIGUNUSED       \-,31,\-        Core    \fBSIGSYS\fP ¤ÈƱµÁ
.TE

.\"O (Signal 29 is
.\"O .B SIGINFO
.\"O /
.\"O .B SIGPWR
.\"O on an alpha but
.\"O .B SIGLOST
.\"O on a sparc.)
(¥·¥°¥Ê¥ë 29 ¤Ï alpha ¤Ç¤Ï
.B SIGINFO
/
.B SIGPWR
¤À¤¬¡¢sparc ¤Ç¤Ï
.B SIGLOST
¤Ç¤¢¤ë¡£)

.\"O .B SIGEMT
.\"O is not specified in POSIX.1-2001, but nevertheless appears
.\"O on most other UNIX systems,
.\"O where its default action is typically to terminate
.\"O the process with a core dump.
.B SIGEMT
¤Ï POSIX.1-2001 ¤Ëµ¬Äꤵ¤ì¤Æ¤¤¤Ê¤¤¤¬¡¢
¤½¤Î¾¤Î¿¤¯¤Î UNIX ¥·¥¹¥Æ¥à¤Ë¸ºß¤¹¤ë¡£
¥Ç¥Õ¥©¥ë¥È¤ÎÆ°ºî¤Ï¿¤¯¤Î¾ì¹ç¡¢¥³¥¢¥À¥ó¥×½ÐÎϤòȼ¤¦¥×¥í¥»¥¹¤Î½ªÎ»¤Ç¤¢¤ë¡£

.\"O .B SIGPWR
.\"O (which is not specified in POSIX.1-2001) is typically ignored
.\"O by default on those other UNIX systems where it appears.
.B SIGPWR
¤Ï (POSIX.1-2001 ¤Ëµ¬Äꤵ¤ì¤Æ¤¤¤Ê¤¤¤¬) ¤³¤Î¥·¥°¥Ê¥ë¤¬Â¸ºß¤¹¤ë
¾¤Î UNIX ¥·¥¹¥Æ¥à¤Ç¤Ï¿¤¯¤Î¾ì¹ç¡¢¥Ç¥Õ¥©¥ë¥ÈÆ°ºî¤Ï̵»ë¤Ç¤¢¤ë¡£

.\"O .B SIGIO
.\"O (which is not specified in POSIX.1-2001) is ignored by default
.\"O on several other UNIX systems.
.B SIGIO
¤Ï (POSIX.1-2001 ¤Ëµ¬Äꤵ¤ì¤Æ¤¤¤Ê¤¤¤¬) ¤¤¤¯¤Ä¤«¤Î¾¤Î UNIX ¥·¥¹¥Æ¥à¤Ç¤Ï
¥Ç¥Õ¥©¥ë¥ÈÆ°ºî¤Ï̵»ë¤Ç¤¢¤ë¡£

.\"O Where defined,
.\"O .B SIGUNUSED
.\"O is synonymous with
.\"O .\" parisc is the only exception: SIGSYS is 12, SIGUNUSED is 31
.\"O .B SIGSYS
.\"O on most architectures.
.B SIGUNUSED
¤¬ÄêµÁ¤µ¤ì¤Æ¤¤¤ë¾ì¹ç¤Ë¤Ï¡¢¤Û¤È¤ó¤É¤Î¥¢¡¼¥­¥Æ¥¯¥Á¥ã¤Ç
.B SIGSYS
¤ÎƱµÁ¸ì¤È¤Ê¤Ã¤Æ¤¤¤ë¡£
.\" parisc is the only exception: SIGSYS is 12, SIGUNUSED is 31
.\"O .SS "Real-time Signals"
.SS ¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë
.\"O Linux supports real-time signals as originally defined in the POSIX.1b
.\"O real-time extensions (and now included in POSIX.1-2001).
Linux ¤Ï¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¡£
¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤Ï¸µ¡¹ POSIX.1b ¤Î¥ê¥¢¥ë¥¿¥¤¥à³ÈÄ¥¤ÇÄêµÁ¤µ¤ì¤Æ
¤¤¤ë¤â¤Î¤Ç¤¢¤ê¡¢¸½ºß¤Ç¤Ï POSIX.1-2001 ¤Ë´Þ¤Þ¤ì¤Æ¤¤¤ë¡£
.\"O The range of supported real-time signals is defined by the macros
.\"O .B SIGRTMIN
.\"O and
.\"O .BR SIGRTMAX .
.\"O POSIX.1-2001 requires that an implementation support at least
.\"O .B _POSIX_RTSIG_MAX
.\"O (8) real-time signals.
Âбþ¤·¤Æ¤¤¤ë¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ÎÈϰϤϡ¢¥Þ¥¯¥í
.B SIGRTMIN
¤È
.B SIGRTMAX
¤ÇÄêµÁ¤µ¤ì¤ë¡£
POSIX.1-2001 ¤Ç¤Ï¡¢¾¯¤Ê¤¯¤È¤â
.B _POSIX_RTSIG_MAX
(8) ¸Ä¤Î¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ËÂбþ¤·¤¿¼ÂÁõ¤¬Í׵ᤵ¤ì¤Æ¤¤¤ë¡£
.PP
.\"O The Linux kernel supports a range of 32 different real-time
.\"O signals, numbered 33 to 64.
.\"O However, the glibc POSIX threads implementation internally uses
.\"O two (for NPTL) or three (for LinuxThreads) real-time signals
.\"O (see
.\"O .BR pthreads (7)),
.\"O and adjusts the value of
.\"O .B SIGRTMIN
.\"O suitably (to 34 or 35).
Linux ¤Ï¡¢32 ¸Ä¤Î°Û¤Ê¤ë¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ËÂбþ¤·¤Æ¤ª¤ê¡¢
¤½¤ÎÈÖ¹æ¤Ï 33 ¤«¤é 64 ¤Ç¤¢¤ë¡£
¤·¤«¤·¤Ê¤¬¤é¡¢glibc ¤Î POSIX ¥¹¥ì¥Ã¥É¼ÂÁõ¤Ï¡¢
ÆâÉô¤Ç 2¸Ä (NPTL ¤Î¾ì¹ç) ¤« 3¸Ä (LinuxThreads ¤Î¾ì¹ç) ¤Î
¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ò»ÈÍѤ·¤Æ¤ª¤ê
.RB ( pthreads (7)
»²¾È)¡¢
.B SIGRTMIN
¤ÎÃͤòŬÀÚ¤Ë (34 ¤« 35 ¤Ë) Ä´À°¤¹¤ë¡£
.\"O Because the range of available real-time signals varies according
.\"O to the glibc threading implementation (and this variation can occur
.\"O at run time according to the available kernel and glibc),
.\"O and indeed the range of real-time signals varies across UNIX systems,
.\"O programs should
.\"O .IR "never refer to real-time signals using hard-coded numbers" ,
.\"O but instead should always refer to real-time signals using the notation
.\"O .BR SIGRTMIN +n,
.\"O and include suitable (run-time) checks that
.\"O .BR SIGRTMIN +n
.\"O does not exceed
.\"O .BR SIGRTMAX .
ÍøÍѲÄǽ¤Ê¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ÎÈÏ°Ï¤Ï glibc ¤Î¥¹¥ì¥Ã¥É¼ÂÁõ¤Ë¤è¤ê
°Û¤Ê¤ë¤· (»ÈÍѤ¹¤ë¥«¡¼¥Í¥ë¤È glibc ¤Ë¤è¤ê¼Â¹Ô»þ¤Ë¤âÊѲ½¤¹¤ë)¡¢
UNIX ¥·¥¹¥Æ¥à¤Î¼ïÎà¤Ë¤è¤Ã¤Æ¤â°Û¤Ê¤ë¡£¤·¤¿¤¬¤Ã¤Æ¡¢
¥×¥í¥°¥é¥à¤Ç¤Ï¡Ö¥Ï¡¼¥É¥³¡¼¥Ç¥£¥ó¥°¤·¤¿¿ô»ú¤ò»È¤Ã¤Æ¤Î¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤Î
»²¾È¤Ï·è¤·¤Æ¤¹¤Ù¤­¤Ç¤Ï¤Ê¤¯¡×¡¢Âå¤ï¤ê¤Ë
.BR SIGRTMIN +n
¤Î·Á¤Ç»²¾È¤¹¤Ù¤­¤Ç¤¢¤ë¡£¤Þ¤¿¡¢
.BR SIGRTMIN +n
¤¬
.B SIGRTMAX
¤òĶ¤¨¤Æ¤¤¤Ê¤¤¤«¤Î¥Á¥§¥Ã¥¯¤ò (¼Â¹Ô»þ¤Ë) ŬÀڤ˹Ԥ¦¤Ù¤­¤Ç¤¢¤ë¡£
.PP
.\"O Unlike standard signals, real-time signals have no predefined meanings:
.\"O the entire set of real-time signals can be used for application-defined
.\"O purposes.
ɸ½à¥·¥°¥Ê¥ë¤È°Û¤Ê¤ê¡¢¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤Ë¤Ï
»öÁ°¤ËÄêµÁ¤µ¤ì¤¿°ÕÌ£¤Ï¤Ê¤¤¡£
¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ÎÁ´Éô¤ò¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤ÇÄêµÁ¤·¤¿ÍÑÅӤ˻Ȥ¨¤ë¡£
.PP
.\"O The default action for an unhandled real-time signal is to terminate the
.\"O receiving process.
¥Ï¥ó¥É¥ê¥ó¥°¤·¤Ê¤¤¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤Î¥Ç¥Õ¥©¥ë¥È¤ÎÆ°ºî¤Ï
¼õ¿®¤·¤¿¥×¥í¥»¥¹¤Î½ªÎ»¤Ç¤¢¤ë¡£
.PP
.\"O Real-time signals are distinguished by the following:
¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤Ï°Ê²¼¤ÎÆÃħ¤¬¤¢¤ë:
.IP 1. 4
.\"O Multiple instances of real-time signals can be queued.
.\"O By contrast, if multiple instances of a standard signal are delivered
.\"O while that signal is currently blocked, then only one instance is queued.
¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ÏÊ£¿ô¤Î¼ÂÂΤò¥­¥å¡¼¤ËÆþ¤ì¤ë¤³¤È¤¬¤Ç¤­¤ë¡£
°ìÊý¡¢É¸½à¥·¥°¥Ê¥ë¤Î¾ì¹ç¡¢¤½¤Î¥·¥°¥Ê¥ë¤¬¥Ö¥í¥Ã¥¯¤µ¤ì¤Æ¤¤¤ë´Ö¤Ë
Ʊ¤¸¥·¥°¥Ê¥ë¤ÎÊ£¿ô¤Î¥¤¥ó¥¹¥¿¥ó¥¹¤¬ÇÛÁ÷¤µ¤ì¤Æ¤â¡¢
1 ¤Ä¤À¤±¤¬¥­¥å¡¼¤ËÆþ¤ì¤é¤ì¤ë¡£
.IP 2. 4
.\"O If the signal is sent using
.\"O .BR sigqueue (3),
.\"O an accompanying value (either an integer or a pointer) can be sent
.\"O with the signal.
¥·¥°¥Ê¥ë¤¬
.BR sigqueue (3)
¤òÍѤ¤¤ÆÁ÷¿®¤µ¤ì¤¿¾ì¹ç¡¢
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.\"O If the receiving process establishes a handler for this signal using the
.\"O .B SA_SIGINFO
.\"O flag to
.\"O .BR sigaction (2)
.\"O then it can obtain this data via the
.\"O .I si_value
.\"O field of the
.\"O .I siginfo_t
.\"O structure passed as the second argument to the handler.
¼õ¿®Â¦¥×¥í¥»¥¹¤¬
.BR sigaction (2)
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.B SA_SIGINFO
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.I siginfo_t
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.I si_value
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.\"O Furthermore, the
.\"O .I si_pid
.\"O and
.\"O .I si_uid
.\"O fields of this structure can be used to obtain the PID
.\"O and real user ID of the process sending the signal.
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.I si_pid
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.I si_uid
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.\"O Real-time signals are delivered in a guaranteed order.
.\"O Multiple real-time signals of the same type are delivered in the order
.\"O they were sent.
.\"O If different real-time signals are sent to a process, they are delivered
.\"O starting with the lowest-numbered signal.
.\"O (I.e., low-numbered signals have highest priority.)
.\"O By contrast, if multiple standard signals are pending for a process,
.\"O the order in which they are delivered is unspecified.
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.PP
.\"O If both standard and real-time signals are pending for a process,
.\"O POSIX leaves it unspecified which is delivered first.
.\"O Linux, like many other implementations, gives priority
.\"O to standard signals in this case.
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.PP
.\"O According to POSIX, an implementation should permit at least
.\"O .B _POSIX_SIGQUEUE_MAX
.\"O (32) real-time signals to be queued to
.\"O a process.
POSIX ¤Ë¤è¤ì¤Ð¡¢1 ¥×¥í¥»¥¹Ëè¤ËºÇÄã
.B _POSIX_SIGQUEUE_MAX
(32) ¸Ä¤Î¥ê¥¢¥ë¥¿¥¤¥à¥·¥°¥Ê¥ë¤ò¥­¥å¡¼¤ËÆþ¤ì¤é¤ì¤ë¤Ù¤­¤È¤·¤Æ¤¤¤ë¡£
.\"O However, Linux does things differently.
.\"O In kernels up to and including 2.6.7, Linux imposes
.\"O a system-wide limit on the number of queued real-time signals
.\"O for all processes.
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.\"O This limit can be viewed and (with privilege) changed via the
.\"O .I /proc/sys/kernel/rtsig-max
.\"O file.
.\"O A related file,
.\"O .IR /proc/sys/kernel/rtsig-nr ,
.\"O can be used to find out how many real-time signals are currently queued.
¤³¤ÎÀ©¸Â¤Ï
.I /proc/sys/kernel/rtsig-max
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.I /proc/sys/kernel/rtsig-nr
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.\"O In Linux 2.6.8, these
.\"O .I /proc
.\"O interfaces were replaced by the
.\"O .B RLIMIT_SIGPENDING
.\"O resource limit, which specifies a per-user limit for queued
.\"O signals; see
.\"O .BR setrlimit (2)
.\"O for further details.
Linux 2.6.8 ¤Ç¡¢¤³¤ì¤é¤Î
.I /proc
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.B RLIMIT_SIGPENDING
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.BR setrlimit (2)
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.\"O .SS "Async-signal-safe functions"
.SS "ÈóƱ´ü¥·¥°¥Ê¥ë¤Ç°ÂÁ´¤Ê´Ø¿ô (async-signal-safe functions)"
.PP
.\"O A signal handler function must be very careful,
.\"O since processing elsewhere may be interrupted
.\"O at some arbitrary point in the execution of the program.
.\"O POSIX has the concept of "safe function".
.\"O If a signal interrupts the execution of an unsafe function, and
.\"O .I handler
.\"O calls an unsafe function, then the behavior of the program is undefined.
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.I handler
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.\"O POSIX.1-2004 (also known as POSIX.1-2001 Technical Corrigendum 2)
.\"O requires an implementation to guarantee that the following
.\"O functions can be safely called inside a signal handler:
POSIX.1-2004 (POSIX.1-2001 Technical Corrigendum (Àµ¸íɽ) 2 ¤È¤â¸À¤¦) ¤Ç¤Ï¡¢
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.in +4
.nf
_Exit()
_exit()
abort()
accept()
access()
aio_error()
aio_return()
aio_suspend()
alarm()
bind()
cfgetispeed()
cfgetospeed()
cfsetispeed()
cfsetospeed()
chdir()
chmod()
chown()
clock_gettime()
close()
connect()
creat()
dup()
dup2()
execle()
execve()
fchmod()
fchown()
fcntl()
fdatasync()
fork()
fpathconf()
fstat()
fsync()
ftruncate()
getegid()
geteuid()
getgid()
getgroups()
getpeername()
getpgrp()
getpid()
getppid()
getsockname()
getsockopt()
getuid()
kill()
link()
listen()
lseek()
lstat()
mkdir()
mkfifo()
open()
pathconf()
pause()
pipe()
poll()
posix_trace_event()
pselect()
raise()
read()
readlink()
recv()
recvfrom()
recvmsg()
rename()
rmdir()
select()
sem_post()
send()
sendmsg()
sendto()
setgid()
setpgid()
setsid()
setsockopt()
setuid()
shutdown()
sigaction()
sigaddset()
sigdelset()
sigemptyset()
sigfillset()
sigismember()
signal()
sigpause()
sigpending()
sigprocmask()
sigqueue()
sigset()
sigsuspend()
sleep()
sockatmark()
socket()
socketpair()
stat()
symlink()
sysconf()
tcdrain()
tcflow()
tcflush()
tcgetattr()
tcgetpgrp()
tcsendbreak()
tcsetattr()
tcsetpgrp()
time()
timer_getoverrun()
timer_gettime()
timer_settime()
times()
umask()
uname()
unlink()
utime()
wait()
waitpid()
write()
.fi
.in
.PP
.\"O POSIX.1-2008 removes fpathconf(), pathconf(), and sysconf()
.\"O from the above list, and adds the following functions:
POSIX.1-2008 ¤Ç¤Ï¡¢¾åµ­¤Î¥ê¥¹¥È¤Î¤¦¤Á fpathconf(), pathconf(), sysconf()
¤¬ºï½ü¤µ¤ì¡¢°Ê²¼¤Î´Ø¿ô¤¬Äɲ䵤줿¡£
.PP
.in +4n
.nf
execl()
execv()
faccessat()
fchmodat()
fchownat()
fexecve()
fstatat()
futimens()
linkat()
mkdirat()
mkfifoat()
mknod()
mknodat()
openat()
readlinkat()
renameat()
symlinkat()
unlinkat()
utimensat()
utimes()
.fi
.in
.\"O .SS Interruption of System Calls and Library Functions by Signal Handlers
.SS ¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤ë¥·¥¹¥Æ¥à¥³¡¼¥ë¤ä¥é¥¤¥Ö¥é¥ê´Ø¿ô¤Ø¤Î³ä¤ê¹þ¤ß
.\"O If a signal handler is invoked while a system call or library
.\"O function call is blocked, then either:
¥·¥¹¥Æ¥à¥³¡¼¥ë¤ä¥é¥¤¥Ö¥é¥ê¤¬Ää»ß (block) ¤·¤Æ¤¤¤ë´Ö¤Ë¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤¬
µ¯Æ°¤µ¤ì¤ë¤È¡¢°Ê²¼¤Î¤É¤Á¤é¤«¤È¤Ê¤ë¡£
.IP * 2
.\"O the call is automatically restarted after the signal handler returns; or
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.IP *
.\"O the call fails with the error
.\"O .BR EINTR .
¸Æ¤Ó½Ð¤·¤Ï¥¨¥é¡¼
.B EINTR
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.PP
.\"O Which of these two behaviors occurs depends on the interface and
.\"O whether or not the signal handler was established using the
.\"O .BR SA_RESTART
.\"O flag (see
.\"O .BR sigaction (2)).
.\"O The details vary across UNIX systems;
.\"O below, the details for Linux.
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¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤¬
.B SA_RESTART
¥Õ¥é¥°
.RB ( sigaction (2)
»²¾È) ¤ò»È¤Ã¤ÆÀßÄꤵ¤ì¤Æ¤¤¤¿¤«¤Ë¤â°Í¸¤¹¤ë¡£
¾ÜºÙ¤Ï UNIX ¥·¥¹¥Æ¥à¤Ë¤è¤Ã¤Æ°Û¤Ê¤ë¡£
Linux ¤Ë¤ª¤±¤ë¾ÜºÙ¤ò°Ê²¼¤ÇÀâÌÀ¤¹¤ë¡£

.\"O If a blocked call to one of the following interfaces is interrupted
.\"O by a signal handler, then the call will be automatically restarted
.\"O after the signal handler returns if the
.\"O .BR SA_RESTART
.\"O flag was used; otherwise the call will fail with the error
.\"O .BR EINTR :
.\"O .\" The following system calls use ERESTARTSYS,
.\"O .\" so that they are restartable
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.B SA_RESTART
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¤½¤ì°Ê³°¤Î¾ì¹ç¤Ï¡¢¤½¤Î¸Æ¤Ó½Ð¤·¤Ï¥¨¥é¡¼
.B EINTR
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.\" °Ê²¼¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï ERESTARTSYS ¤ò»È¤Ã¤Æ¤¤¤ë¡£
.\" ¤½¤Î¤¿¤á¡¢¤³¤ì¤é¤ÏºÆ¥¹¥¿¡¼¥È¤¬²Äǽ¤Ç¤¢¤ë¡£
.RS 4
.IP * 2
.\"O .BR read (2),
.\"O .BR readv (2),
.\"O .BR write (2),
.\"O .BR writev (2),
.\"O and
.\"O .BR ioctl (2)
.\"O calls on "slow" devices.
.\"O A "slow" device is one where the I/O call may block for an
.\"O indefinite time, for example, a terminal, pipe, or socket.
.\"O (A disk is not a slow device according to this definition.)
.\"O If an I/O call on a slow device has already transferred some
.\"O data by the time it is interrupted by a signal handler,
.\"O then the call will return a success status
.\"O (normally, the number of bytes transferred).
.BR read (2),
.BR readv (2),
.BR write (2),
.BR writev (2),
.BR ioctl (2)
¤Î¡ÖÃÙ¤¤ (slow)¡×¥Ç¥Ð¥¤¥¹¤ËÂФ¹¤ë¸Æ¤Ó½Ð¤·¡£
¤³¤³¤Ç¤¤¤¦¡ÖÃÙ¤¤¡×¥Ç¥Ð¥¤¥¹¤È¤Ï¡¢I/O ¸Æ¤Ó½Ð¤·¤¬Ìµ´ü¸Â¤ËÄä»ß (block) ¤¹¤ë
²ÄǽÀ­¤Î¤¢¤ë¥Ç¥Ð¥¤¥¹¤Î¤³¤È¤Ç¡¢Îã¤È¤·¤Æ¤ÏüËö¡¢¥Ñ¥¤¥×¡¢¥½¥±¥Ã¥È¤¬¤¢¤ë
(¤³¤ÎÄêµÁ¤Ç¤Ï¡¢¥Ç¥£¥¹¥¯¤ÏÃÙ¤¤¥Ç¥Ð¥¤¥¹¤Ç¤Ï¤Ê¤¤)¡£
ÃÙ¤¤¥Ç¥Ð¥¤¥¹¤ËÂФ¹¤ë I/O ¸Æ¤Ó½Ð¤·¤¬¡¢
¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤ê³ä¤ê¹þ¤Þ¤ì¤¿»þÅÀ¤Þ¤Ç¤Ë²¿¤é¤«¤Î¥Ç¡¼¥¿¤ò
¤¹¤Ç¤ËžÁ÷¤·¤Æ¤¤¤ì¤Ð¡¢¸Æ¤Ó½Ð¤·¤ÏÀ®¸ù¥¹¥Æ¡¼¥¿¥¹
(Ä̾ï¤Ï¡¢Å¾Á÷¤µ¤ì¤¿¥Ð¥¤¥È¿ô) ¤òÊÖ¤¹¤³¤È¤À¤í¤¦¡£
.IP *
.\"O .BR open (2),
.\"O if it can block (e.g., when opening a FIFO; see
.\"O .BR fifo (7)).
Ää»ß (block) ¤¹¤ë²ÄǽÀ­¤Î¤¢¤ë
.BR open (2)
(Î㤨¤Ð¡¢FIFO ¤Î¥ª¡¼¥×¥ó»þ;
.BR fifo (7)
»²¾È)¡£
.IP *
.\"O .BR wait (2),
.\"O .BR wait3 (2),
.\"O .BR wait4 (2),
.\"O .BR waitid (2),
.\"O and
.\"O .BR waitpid (2).
.BR wait (2),
.BR wait3 (2),
.BR wait4 (2),
.BR waitid (2),
.BR waitpid (2).
.IP *
.\"O Socket interfaces:
¥½¥±¥Ã¥È¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹:
.\" If a timeout (setsockopt()) is in effect on the socket, then these
.\" system calls switch to using EINTR.  Consequently, they and are not
.\" automatically restarted, and they show the stop/cont behavior
.\" described below.  (Verified from 2.6.26 source, and by experiment; mtk)
.\"O .BR accept (2),
.\"O .BR connect (2),
.\"O .BR recv (2),
.\"O .BR recvfrom (2),
.\"O .BR recvmsg (2),
.\"O .BR send (2),
.\"O .BR sendto (2),
.\"O and
.\"O .BR sendmsg (2),
.\"O unless a timeout has been set on the socket (see below).
.BR accept (2),
.BR connect (2),
.BR recv (2),
.BR recvfrom (2),
.BR recvmsg (2),
.BR send (2),
.BR sendto (2),
.BR sendmsg (2).
⤷¡¢¥½¥±¥Ã¥È¤Ë¥¿¥¤¥à¥¢¥¦¥È¤¬ÀßÄꤵ¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç (²¼µ­»²¾È)¡£
.IP *
.\"O File locking interfaces:
¥Õ¥¡¥¤¥ë¥í¥Ã¥¯ÍÑ¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹:
.\"O .BR flock (2)
.\"O and
.\"O .BR fcntl (2)
.\"O .BR F_SETLKW .
.BR flock (2),
.BR fcntl (2)
.BR F_SETLKW .
.IP *
.\"O POSIX message queue interfaces:
POSIX ¥á¥Ã¥»¡¼¥¸¥­¥å¡¼¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹:
.BR mq_receive (3),
.BR mq_timedreceive (3),
.BR mq_send (3),
.\"O and
.BR mq_timedsend (3).
.IP *
.BR futex (2)
.B FUTEX_WAIT
.\"O (since Linux 2.6.22; beforehand, always failed with
.\"O .BR EINTR ).
(Linux 2.6.22 °Ê¹ß; ¤½¤ì°ÊÁ°¤Ï¾ï¤Ë
.B EINTR
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.IP *
.\"O POSIX semaphore interfaces:
POSIX ¥»¥Þ¥Õ¥©¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹:
.\"O .BR sem_wait (3)
.\"O and
.\"O .BR sem_timedwait (3)
.\"O (since Linux 2.6.22; beforehand, always failed with
.\"O .BR EINTR ).
.BR sem_wait (3),
.BR sem_timedwait (3)
(Linux 2.6.22 °Ê¹ß; ¤½¤ì°ÊÁ°¤Ï¾ï¤Ë
.B EINTR
¤Ç¼ºÇÔ¤·¤Æ¤¤¤¿)¡£
.RE
.PP
.\"O The following interfaces are never restarted after
.\"O being interrupted by a signal handler,
.\"O regardless of the use of
.\"O .BR SA_RESTART ;
.\"O they always fail with the error
.\"O .B EINTR
.\"O when interrupted by a signal handler:
.\"O .\" These are the system calls that give EINTR or ERESTARTNOHAND
.\"O .\" on interruption by a signal handler.
°Ê²¼¤Î¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹¤Ï¡¢
.B SA_RESTART
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ºÆ¥¹¥¿¡¼¥È¤¹¤ë¤³¤È¤Ï·è¤·¤Æ¤Ê¤¤¡£
¤³¤ì¤é¤Ï¡¢¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤ê³ä¤ê¹þ¤Þ¤ì¤ë¤È¡¢¾ï¤Ë¥¨¥é¡¼
.B EINTR
¤Ç¼ºÇÔ¤¹¤ë¡£
.\" ¤³¤ì¤é¤Ï¡¢¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Ë¤è¤ë³ä¤ê¹þ¤ß¤ÎºÝ¤Ë
.\" EINTR ¤« ERESTARTNOHAND ¤òÊÖ¤¹¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ç¤¢¤ë¡£
.RS 4
.IP * 2
.\"O Socket interfaces, when a timeout has been set on the socket using
.\"O .BR setsockopt (2):
.\"O .BR accept (2),
.\"O .BR recv (2),
.\"O .BR recvfrom (2),
.\"O and
.\"O .BR recvmsg (2),
.\"O if a receive timeout
.\"O .RB ( SO_RCVTIMEO )
.\"O has been set;
.\"O .BR connect (2),
.\"O .BR send (2),
.\"O .BR sendto (2),
.\"O and
.\"O .BR sendmsg (2),
.\"O if a send timeout
.\"O .RB ( SO_SNDTIMEO )
.\"O has been set.
.BR setsockopt (2)
¤ò»È¤Ã¤Æ¥¿¥¤¥à¥¢¥¦¥È¤¬ÀßÄꤵ¤ì¤Æ¤¤¤ë¥½¥±¥Ã¥È¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹:
.BR accept (2),
.BR recv (2),
.BR recvfrom (2),
.BR recvmsg (2)
¤Ç¼õ¿®¥¿¥¤¥à¥¢¥¦¥È
.RB ( SO_RCVTIMEO )
¤¬ÀßÄꤵ¤ì¤Æ¤¤¤ë¾ì¹ç¤È¡¢
.BR connect (2),
.BR send (2),
.BR sendto (2),
.BR sendmsg (2)
¤ÇÁ÷¿®¥¿¥¤¥à¥¢¥¦¥È
.RB ( SO_SNDTIMEO )
¤¬ÀßÄꤵ¤ì¤Æ¤¤¤ë¾ì¹ç¡£
.IP *
.\"O Interfaces used to wait for signals:
¥·¥°¥Ê¥ëÂÔ¤Á¤Ë»È¤ï¤ì¤ë¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹:
.BR pause (2),
.BR sigsuspend (2),
.BR sigtimedwait (2),
.\"O and
.BR sigwaitinfo (2).
.IP *
.\"O File descriptor multiplexing interfaces:
¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿Â¿½Å¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹:
.BR epoll_wait (2),
.BR epoll_pwait (2),
.BR poll (2),
.BR ppoll (2),
.BR select (2),
.\"O and
.BR pselect (2).
.IP *
.\"O System V IPC interfaces:
System V IPC ¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹:
.\" On some other systems, SA_RESTART does restart these system calls
.BR msgrcv (2),
.BR msgsnd (2),
.BR semop (2),
.\"O and
.BR semtimedop (2).
.IP *
.\"O Sleep interfaces:
¥¹¥ê¡¼¥×ÍѤΥ¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹:
.BR clock_nanosleep (2),
.BR nanosleep (2),
.\"O and
.BR usleep (3).
.IP *
.\"O .BR read (2)
.\"O from an
.\"O .BR inotify (7)
.\"O file descriptor.
.BR inotify (7)
¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤«¤é¤Î
.BR read (2).
.IP *
.BR io_getevents (2).
.RE
.PP
.\"O The
.\"O .BR sleep (3)
.\"O function is also never restarted if interrupted by a handler,
.\"O but gives a success return: the number of seconds remaining to sleep.
.BR sleep (3)
´Ø¿ô¤â¡¢¥Ï¥ó¥É¥é¤Ë¤è¤ê³ä¤ê¹þ¤Þ¤ì¤¿¾ì¹ç¡¢·è¤·¤ÆºÆ¥¹¥¿¡¼¥È¤µ¤ì¤ë¤³¤È¤Ï¤Ê¤¤¡£
¤·¤«¤·¡¢À®¸ù¤È¤Ê¤ê¡¢»Ä¤Ã¤Æ¤¤¤ëÄä»ß»þ´Ö¤òÊÖ¤¹¡£
.\"O .SS Interruption of System Calls and Library Functions by Stop Signals
.SS °ì»þÄä»ß¥·¥°¥Ê¥ë¤Ë¤è¤ë¥·¥¹¥Æ¥à¥³¡¼¥ë¤ä¥é¥¤¥Ö¥é¥ê´Ø¿ô¤Ø¤Î³ä¤ê¹þ¤ß
.\"O On Linux, even in the absence of signal handlers,
.\"O certain blocking interfaces can fail with the error
.\"O .BR EINTR
.\"O after the process is stopped by one of the stop signals
.\"O and then resumed via
.\"O .BR SIGCONT .
.\"O This behavior is not sanctioned by POSIX.1, and doesn't occur
.\"O on other systems.
Linux ¤Ç¤Ï¡¢¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤¬ÀßÄꤵ¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç¤Ç¤â¡¢
¤¤¤¯¤Ä¤«¤Î¥Ö¥í¥Ã¥­¥ó¥°·¿¤Î¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹¤Ï¡¢
¥×¥í¥»¥¹¤¬°ì»þÄä»ß (stop) ¥·¥°¥Ê¥ë¤Î°ì¤Ä¤Ë¤è¤êÄä»ß¤µ¤ì¡¢
.B SIGCONT
¤Ë¤è¤êºÆ³«¤µ¤ì¤¿¸å¤Ë¡¢¥¨¥é¡¼
.B EINTR
¤Ç¼ºÇÔ¤¹¤ë²ÄǽÀ­¤¬¤¢¤ë¡£
¤³¤ÎµóÆ°¤Ï POSIX.1 ¤Çǧ¤á¤é¤ì¤Æ¤ª¤é¤º¡¢Â¾¤Î¥·¥¹¥Æ¥à¤Ç¤Ïµ¯¤³¤é¤Ê¤¤¡£

.\"O The Linux interfaces that display this behavior are:
¤³¤ÎµóÆ°¤ò¼¨¤¹ Linux ¤Î¥¤¥ó¥¿¡¼¥Õ¥§¥¤¥¹¤Ï°Ê²¼¤ÎÄ̤ê¤Ç¤¢¤ë¡£
.RS 4
.IP * 2
.\"O Socket interfaces, when a timeout has been set on the socket using
.\"O .BR setsockopt (2):
.\"O .BR accept (2),
.\"O .BR recv (2),
.\"O .BR recvfrom (2),
.\"O and
.\"O .BR recvmsg (2),
.\"O if a receive timeout
.\"O .RB ( SO_RCVTIMEO )
.\"O has been set;
.\"O .BR connect (2),
.\"O .BR send (2),
.\"O .BR sendto (2),
.\"O and
.\"O .BR sendmsg (2),
.\"O if a send timeout
.\"O .RB ( SO_SNDTIMEO )
.\"O has been set.
.BR setsockopt (2)
¤ò»È¤Ã¤Æ¥¿¥¤¥à¥¢¥¦¥È¤¬ÀßÄꤵ¤ì¤Æ¤¤¤ë¥½¥±¥Ã¥È¥¤¥ó¥¿¡¼¥Õ¥§¡¼¥¹:
.BR accept (2),
.BR recv (2),
.BR recvfrom (2),
.BR recvmsg (2)
¤Ç¼õ¿®¥¿¥¤¥à¥¢¥¦¥È
.RB ( SO_RCVTIMEO )
¤¬ÀßÄꤵ¤ì¤Æ¤¤¤ë¾ì¹ç¤È¡¢
.BR connect (2),
.BR send (2),
.BR sendto (2),
.BR sendmsg (2)
¤ÇÁ÷¿®¥¿¥¤¥à¥¢¥¦¥È
.RB ( SO_SNDTIMEO )
¤¬ÀßÄꤵ¤ì¤Æ¤¤¤ë¾ì¹ç¡£
.IP * 2
.BR epoll_wait (2),
.BR epoll_pwait (2).
.IP *
.BR semop (2),
.BR semtimedop (2).
.IP *
.BR sigtimedwait (2),
.BR sigwaitinfo (2).
.IP *
.\"O .BR read (2)
.\"O from an
.\"O .BR inotify (7)
.\"O file descriptor.
.BR inotify (7)
¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤«¤é¤Î
.BR read (2).
.IP *
.\"O Linux 2.6.21 and earlier:
Linux 2.6.21 °ÊÁ°:
.BR futex (2)
.BR FUTEX_WAIT ,
.BR sem_timedwait (3),
.BR sem_wait (3).
.IP *
.\"O Linux 2.6.8 and earlier:
Linux 2.6.8 °ÊÁ°:
.BR msgrcv (2),
.BR msgsnd (2).
.IP *
.\"O Linux 2.4 and earlier:
Linux 2.4 °ÊÁ°:
.BR nanosleep (2).
.RE
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O POSIX.1, except as noted.
POSIX.1 (Ãíµ­¤·¤¿ÆâÍưʳ°)¡£
.\"O .SH BUGS
.SH ¥Ð¥°
.\"O .B SIGIO
.\"O and
.\"O .B SIGLOST
.\"O have the same value.
.\"O The latter is commented out in the kernel source, but
.\"O the build process of some software still thinks that
.\"O signal 29 is
.\"O .BR SIGLOST .
.B SIGIO
¤È
.B SIGLOST
¤ÏƱ¤¸Ãͤò»ý¤Ã¤Æ¤¤¤ë¡£
.B SIGLOST
¤Ï¥«¡¼¥Í¥ë¤Î¥½¡¼¥¹¤Ç¤Ï¥³¥á¥ó¥È¥¢¥¦¥È¤µ¤ì¤Æ¤¤¤ë¡£
¤·¤«¤·¡¢¥½¥Õ¥È¥¦¥§¥¢¤Ë¤è¤Ã¤Æ¤Ï¥Ó¥ë¥É¤Î²áÄø¤Ç¥·¥°¥Ê¥ë 29 ¤ò
.B SIGLOST
¤È¤ß¤Ê¤·¤Æ¤·¤Þ¤¦¤â¤Î¤¬¤¢¤ë¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR kill (1),
.BR getrlimit (2),
.BR kill (2),
.BR killpg (2),
.BR rt_sigqueueinfo (2),
.BR setitimer (2),
.BR setrlimit (2),
.BR sgetmask (2),
.BR sigaction (2),
.BR sigaltstack (2),
.BR signal (2),
.BR signalfd (2),
.BR sigpending (2),
.BR sigprocmask (2),
.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 sigwait (3),
.BR strsignal (3),
.BR sysv_signal (3),
.BR core (5),
.BR proc (5),
.BR pthreads (7),
.BR sigevent (7)