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[linuxjm/jm.git] / manual / LDP_man-pages / draft / man2 / sigprocmask.2

.\" Copyright (c) 2005 Michael Kerrisk
.\" based on earlier work by faith@cs.unc.edu and
.\" Mike Battersby <mib@deakin.edu.au>
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" 2005-09-15, mtk, Created new page by splitting off from sigaction.2
.\"
.\" Japanese Version Copyright (c) 2005 Akihiro MOTOKI all rights reserved.
.\" Translated 2005-10-03, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH SIGPROCMASK 2 2008-10-17 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O sigprocmask \- examine and change blocked signals
sigprocmask \- ¶Ø»ß¤¹¤ë¥·¥°¥Ê¥ë¤Î³Îǧ¤ÈÊѹ¹
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.B #include <signal.h>
.sp
.BI "int sigprocmask(int " how ", const sigset_t *" set ,
.BI "sigset_t *" oldset );
.sp
.in -4n
.\"O Feature Test Macro Requirements for glibc (see
.\"O .BR feature_test_macros (7)):
glibc ¸þ¤±¤Îµ¡Ç½¸¡ºº¥Þ¥¯¥í¤ÎÍ×·ï
.RB ( feature_test_macros (7)
»²¾È):
.in
.sp
.ad l
.BR sigprocmask ():
_POSIX_C_SOURCE\ >=\ 1 || _XOPEN_SOURCE || _POSIX_SOURCE
.ad b
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O .BR sigprocmask ()
.\"O is used to fetch and/or change the signal mask of the calling thread.
.\"O The signal mask is the set of signals whose delivery is currently
.\"O blocked for the caller
.\"O (see also
.\"O .BR signal (7)
.\"O for more details).
.BR sigprocmask ()
¤ò»È¤¦¤È¡¢¸Æ¤Ó½Ð¤·¤¿¥¹¥ì¥Ã¥É¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤Î¼èÆÀ/Êѹ¹¤¬¤Ç¤­¤ë¡£
¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤Ï¡¢¸Æ¤Ó½Ð¤·¸µ¤ËÂФ·¤Æ¸½ºßÇÛÁ÷¤¬¶Ø»ß¤µ¤ì¤Æ¤¤¤ë¥·¥°¥Ê¥ë¤Î
½¸¹ç¤Î¤³¤È¤Ç¤¢¤ë (¾ÜºÙ¤Ë¤Ä¤¤¤Æ¤Ï
.BR signal (7)
¤â»²¾È¤Î¤³¤È)¡£

.\"O The behavior of the call is dependent on the value of
.\"O .IR how ,
.\"O as follows.
¤³¤Î¥³¡¼¥ë¤ÎÆ°ºî¤Ï
.I how
¤ÎÃͤˤè¤Ã¤Æ·è¤Þ¤ë:
.TP
.B SIG_BLOCK
.\"O The set of blocked signals is the union of the current set and the
.\"O .I set
.\"O argument.
¶Ø»ß¤µ¤ì¤¿¥·¥°¥Ê¥ë¤Î½¸¹ç¤Ï¸½ºß¤ÎÃͤÈ
.I set
°ú¤­¿ô¤ò·ë¹ç¤·¤¿¤â¤Î¤È¤Ê¤ë¡£
.TP
.B SIG_UNBLOCK
.\"O The signals in
.\"O .I set
.\"O are removed from the current set of blocked signals.
.\"O It is permissible to attempt to unblock a signal which is not blocked.
¸½ºß¶Ø»ß¤µ¤ì¤Æ¤¤¤ë¥·¥°¥Ê¥ë¤Î½¸¹ç¤«¤é
.I set
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¤¹¤ë¤³¤È¤âǧ¤á¤é¤ì¤Æ¤¤¤ë¡£
.TP
.B SIG_SETMASK
.\"O The set of blocked signals is set to the argument
.\"O .IR set .
¶Ø»ß¤µ¤ì¤Æ¤¤¤ë¥·¥°¥Ê¥ë¤Î½¸¹ç¤Ë
.I set
°ú¤­¿ô¤òÀßÄꤹ¤ë¡£
.PP
.\"O If
.\"O .I oldset
.\"O is non-NULL, the previous value of the signal mask is stored in
.\"O .IR oldset .
.I oldset
¤¬ NULL ¤Ç¤Ê¤±¤ì¤Ð¡¢¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤Îº£¤Þ¤Ç¤ÎÃͤò
.I oldset
¤Ë³ÊǼ¤¹¤ë¡£

.\"O If
.\"O .I set
.\"O is NULL, then the signal mask is unchanged (i.e.,
.\"O .I how
.\"O is ignored),
.\"O but the current value of the signal mask is nevertheless returned in
.\"O .I oldset
.\"O (if it is not NULL).
.I set
¤¬ NULL ¤Ç¤¢¤ì¤Ð¡¢¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤ÏÊѹ¹¤µ¤ì¤Ê¤¤ (¤¹¤Ê¤ï¤Á¡¢
.I how
¤Ï̵»ë¤µ¤ì¤ë)¡£
.I set
¤ÎÃͤˤ«¤«¤ï¤é¤º¡¢¸½ºß¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤ÎÃͤÏ
.I oldset
¤ËÆþ¤ì¤ÆÊÖ¤µ¤ì¤ë (⤷¡¢
.I oldset
¤¬ NULL ¤Ç¤Ê¤¤¾ì¹ç)¡£

.\"O The use of
.\"O .BR sigprocmask ()
.\"O is unspecified in a multithreaded process; see
.\"O .BR pthread_sigmask (3).
¥Þ¥ë¥Á¥¹¥ì¥Ã¥É¤Î¥×¥í¥»¥¹¤Ç
.BR sigprocmask ()
¤ò»ÈÍѤ·¤¿¾ì¹ç¤ÎÆ°ºî¤Ïµ¬Äꤵ¤ì¤Æ¤¤¤Ê¤¤¡£
.BR pthread_sigmask (3)
¤ò»²¾È¤Î¤³¤È¡£
.\"O .SH "RETURN VALUE"
.SH ÊÖ¤êÃÍ
.\"O .BR sigprocmask ()
.\"O returns 0 on success and \-1 on error.
.BR sigprocmask ()
¤ÏÀ®¸ù¤¹¤ì¤Ð 0 ¤òÊÖ¤·¡¢¥¨¥é¡¼¤Ê¤é¤Ð \-1 ¤òÊÖ¤¹¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.B EINVAL
.\"O The value specified in
.\"O .I how
.\"O was invalid.
.I how
¤Ë»ØÄꤵ¤ì¤¿Ãͤ¬Í­¸ú¤Ç¤Ï¤Ê¤¤¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
POSIX.1-2001.
.\"O .SH NOTES
.SH Ãí°Õ
.\"O It is not possible to block
.\"O .BR SIGKILL " or " SIGSTOP .
.\"O Attempts to do so are silently ignored.
.B SIGKILL
¤ä
.B SIGSTOP
¤ò¶Ø»ß¤¹¤ë¤³¤È¤Ï¤Ç¤­¤Ê¤¤¡£
¶Ø»ß¤·¤è¤¦¤È¤·¤Æ¤âÌۤäÆ̵»ë¤µ¤ì¤ë¡£

.\"O Each of the threads in a process has its own signal mask.
¥×¥í¥»¥¹Æâ¤Î³Æ¥¹¥ì¥Ã¥É¤Ï¤½¤ì¤¾¤ìÀìÍѤΥ·¥°¥Ê¥ë¥Þ¥¹¥¯¤ò»ý¤Ä¡£

.\"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 If
.\"O .BR SIGBUS ,
.\"O .BR SIGFPE ,
.\"O .BR SIGILL ,
.\"O or
.\"O .B SIGSEGV
.\"O are generated
.\"O while they are blocked, the result is undefined,
.\"O unless the signal was generated by the
.\"O .BR kill (2),
.\"O .BR sigqueue (2),
.\"O or
.\"O .BR raise (3).
¥·¥°¥Ê¥ë
.BR SIGBUS ,
.BR SIGFPE ,
.BR SIGILL ,
.B SIGSEGV
¤¬¶Ø»ß¤µ¤ì¤Æ¤¤¤ë´Ö¤ËÀ¸À®¤µ¤ì¤¿¾ì¹ç¤Ç¡¢
¤½¤Î¥·¥°¥Ê¥ë¤¬
.BR kill (2),
.BR sigqueue (2),
.BR raise (3)
¤Ë¤è¤Ã¤ÆÀ¸À®¤µ¤ì¤¿¤â¤Î¤Ç¤Ê¤¤¤È¤­¤Ë¤Ï¡¢
¤½¤Î¸å¤ÎÆ°ºî¤Ï̤ÄêµÁ¤Ç¤¢¤ë¡£
.PP
.\"O See
.\"O .BR sigsetops (3)
.\"O for details on manipulating signal sets.
¥·¥°¥Ê¥ë½¸¹ç¤ÎÁàºî¤Ë´Ø¤¹¤ë¾ÜºÙ¤Ï
.BR sigsetops (3)
¤ò»²¾È¤Î¤³¤È¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR kill (2),
.BR pause (2),
.BR sigaction (2),
.BR signal (2),
.BR sigpending (2),
.BR sigqueue (2),
.BR sigsuspend (2),
.BR pthread_sigmask (3),
.BR sigsetops (3),
.BR signal (7)