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.\" Copyright (c) 2005 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" Japanese Version Copyright (c) 2005 Akihiro MOTOKI all rights reserved.
.\" Translated 2005-12-04, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
.TH SIGVEC 3 2007-07-26 "Linux" "Linux Programmer's Manual"
.\"O .SH NAME
.SH ̾Á°
.\"O sigvec, sigblock, sigsetmask, siggetmask, sigmask \- BSD signal API
sigvec, sigblock, sigsetmask, siggetmask, sigmask \- BSD ÈÇ¥·¥°¥Ê¥ë API
.\"O .SH SYNOPSIS
.SH ½ñ¼°
.B #include <signal.h>
.sp
.BI "int sigvec(int " sig ", struct sigvec *" vec ", struct sigvec *" ovec );
.sp
.BI "int sigmask(int " signum );
.sp
.BI "int sigblock(int " mask );
.sp
.BI "int sigsetmask(int " mask );
.sp
.B int siggetmask(void);
.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
.\"O All functions shown above:
¾åµ­¤ÎÁ´¤Æ¤Î´Ø¿ô:
_BSD_SOURCE
.\"O .SH DESCRIPTION
.SH ÀâÌÀ
.\"O These functions are provided in glibc as a compatibility interface
.\"O for programs that make use of the historical BSD signal API.
.\"O This API is obsolete: new applications should use the POSIX signal API
.\"O .RB ( sigaction (2),
.\"O .BR sigprocmask (2),
.\"O etc.)
¤³¤ì¤é¤Î´Ø¿ô¤Ï¡¢ÀΤʤ¬¤é¤Î BSD ÈÇ¥·¥°¥Ê¥ë API ¤ò»ÈÍѤ·¤Æ¤¤¤ë¥×¥í¥°¥é¥à
¤ËÂФ·¤Æ¸ß´¹À­¤Î¤¢¤ë¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤ò glibc ¤ÇÄ󶡤¹¤ë¤â¤Î¤Ç¤¢¤ë¡£
¤³¤Î API ¤Ï²áµî¤Î¤â¤Î¤Ç¤¢¤ê¡¢¿·¤·¤¤¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ç¤Ï
POSIX ¥·¥°¥Ê¥ë API
.RB ( sigaction (2),
.BR sigprocmask (2)
¤Ê¤É) ¤ò»ÈÍѤ¹¤Ù¤­¤Ç¤¢¤ë¡£

.\"O The
.\"O .BR sigvec ()
.\"O function sets and/or gets the disposition of the signal
.\"O .I sig
.\"O (like the POSIX
.\"O .BR sigaction (2)).
´Ø¿ô
.BR sigvec ()
¤Ï¡¢(POSIX ¤Î
.BR sigaction (2)
¤ÈƱÍͤË) ¥·¥°¥Ê¥ë
.I sig
¤ÎÆ°ºî¤ÎÀßÄꡦ¼èÆÀ¤ò¹Ô¤¦¡£
.\"O If
.\"O .I vec
.\"O is not NULL, it points to a
.\"O .I sigvec
.\"O structure that defines the new disposition for
.\"O .IR sig .
.I vec
¤Ï¡¢NULL °Ê³°¤Î¾ì¹ç¡¢
.I sig
¤Î¿·¤·¤¤Æ°ºî¤òÄêµÁ¤·¤¿
.I sigvec
¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤Ç¤¢¤ë¡£
.\"O If
.\"O .I ovec
.\"O is not NULL, it points to a
.\"O .I sigvec
.\"O structure that is used to return the previous disposition of
.\"O .IR sig .
.I ovec
¤Ï¡¢NULL °Ê³°¤Î¾ì¹ç¡¢
.I sig
¤ÎÊѹ¹Á°¤ÎÆ°ºî¤òÊÖ¤¹¤¿¤á¤Ë»ÈÍѤµ¤ì¤ë
.I sigvec
¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤Ç¤¢¤ë¡£
.\"O To obtain the current disposition of
.\"O .I sig
.\"O without changing it, specify NULL for
.\"O .IR vec ,
.\"O and a non-NULL pointer for
.\"O .IR ovec .
.I sig
¤ÎÆ°ºî¤òÊѹ¹¤»¤º¤Ë¸½ºß¤ÎÆ°ºî¤ò¼èÆÀ¤¹¤ë¤¿¤á¤Ë¤Ï¡¢
.I vec
¤Ë NULL ¤ò»ØÄꤷ¡¢
.I ovec
¤Ë NULL ¤Ç¤Ê¤¤¥Ý¥¤¥ó¥¿¤ò»ØÄꤹ¤ì¤Ð¤è¤¤¡£

.\"O The dispositions for
.\"O .B SIGKILL
.\"O and
.\"O .B SIGSTOP
.\"O cannot be changed.
.B SIGKILL
¤È
.B SIGSTOP
¤ÎÆ°ºî¤ÏÊѹ¹¤Ç¤­¤Ê¤¤¡£

.\"O The
.\"O .I sigvec
.\"O structure has the following form:
.I sigvec
¹½Â¤ÂΤϰʲ¼¤ÎÄ̤ê¤Ç¤¢¤ë:
.in +4n
.nf

struct sigvec {
    void (*sv_handler)();  /* Signal disposition */
    int    sv_mask;        /* Signals to be blocked in handler */
    int    sv_flags;       /* Flags */
};

.fi
.in
.\"O The
.\"O .I sv_handler
.\"O field specifies the disposition of the signal, and is either:
.\"O the address of a signal handler function; or
.\"O .B SIG_DFL
.\"O meaning the default disposition applies for the signal; or
.\"O .B SIG_IGN
.\"O meaning that the signal is ignored.
.I sv_handler
¥Õ¥£¡¼¥ë¥É¤Ï¥·¥°¥Ê¥ë¤ÎÆ°ºî¤ò»ØÄꤹ¤ë¤â¤Î¤Ç¡¢
¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é´Ø¿ô¤Î¥¢¥É¥ì¥¹¤«¡¢
.B SIG_DFL
¤È
.B SIG_IGN
¤Î¤¤¤º¤ì¤«¤ò»ØÄê¤Ç¤­¤ë¡£
.B SIG_DFL
¤Ï¥·¥°¥Ê¥ë¤ËŬÍѤµ¤ì¤ë¥Ç¥Õ¥©¥ë¥È¤ÎÆ°ºî¤ò°ÕÌ£¤·¡¢
.B SIG_IGN
¤Ï¥·¥°¥Ê¥ë¤ò̵»ë¤¹¤ë¤³¤È¤ò°ÕÌ£¤¹¤ë¡£

.\"O If
.\"O .I sv_handler
.\"O specifies the address of a signal handler, then
.\"O .I sv_mask
.\"O specifies a mask of signals that are to be blocked while
.\"O the handler is executing.
.\"O In addition, the signal for which the handler is invoked is
.\"O also blocked by default.
.\"O Attempts to block
.\"O .B SIGKILL
.\"O or
.\"O .B SIGSTOP
.\"O are silently ignored.
.I sv_handler
¤Ë¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Î¥¢¥É¥ì¥¹¤ò»ØÄꤷ¤¿¾ì¹ç¡¢
.I sv_mask
¤Ï¥Ï¥ó¥É¥é¤¬¼Â¹ÔÃæ¤Ë¥Ö¥í¥Ã¥¯¤µ¤ì¤ë¤Ù¤­¥·¥°¥Ê¥ë¤Î¥Þ¥¹¥¯¤ò»ØÄꤹ¤ë¡£
¤Þ¤¿¡¢¥Ï¥ó¥É¥é¤òµ¯Æ°¤·¤¿¥·¥°¥Ê¥ë¼«¿È¤Ï¥Ç¥Õ¥©¥ë¥È¤Ç¥Ö¥í¥Ã¥¯¤µ¤ì¤ë¡£
.B SIGKILL
¤«
.B SIGSTOP
¤ò¥Ö¥í¥Ã¥¯¤·¤è¤¦¤È¤·¤¿¾ì¹ç¤Ë¤Ï¡¢ÌۤäÆ̵»ë¤µ¤ì¤ë¡£

.\"O If
.\"O .I sv_handler
.\"O specifies the address of a signal handler, then the
.\"O .I sv_flags
.\"O field specifies flags controlling what happens when the handler is called.
.\"O This field may contain zero or more of the following flags:
.I sv_handler
¤Ë¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤Î¥¢¥É¥ì¥¹¤ò»ØÄꤷ¤¿¾ì¹ç¡¢
.I sv_flags
¥Õ¥£¡¼¥ë¥É¤Ï¥Ï¥ó¥É¥é¤¬¸Æ¤Ð¤ì¤¿ºÝ¤ÎµóÆ°¤òÀ©¸æ¤¹¤ë¥Õ¥é¥°¤ò»ØÄꤹ¤ë¡£
¤³¤Î¥Õ¥£¡¼¥ë¥É¤Ë¤Ï¡¢0 ¤«¡¢°Ê²¼¤Î¥Õ¥é¥°¤ò 1¸Ä°Ê¾å»ØÄê¤Ç¤­¤ë:
.TP
.B SV_INTERRUPT
.\"O If the signal handler interrupts a blocking system call,
.\"O then upon return from the handler the system call will not be restarted:
.\"O instead it will fail with the error
.\"O .BR EINTR .
.\"O If this flag is not specified, then system calls are restarted
.\"O by default.
¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤¬Ää»ßÃæ¤Î¥·¥¹¥Æ¥à¥³¡¼¥ë¤òÃæÃǤ·¤¿¾ì¹ç¡¢
¥Ï¥ó¥É¥é¤«¤éÉüµ¢¤·¤Æ¤â¡¢¥·¥¹¥Æ¥à¥³¡¼¥ë¤ÏºÆ³«¤µ¤ì¤º¡¢
¥¨¥é¡¼
.B EINTR
¤Ç¼ºÇÔ¤¹¤ë¡£
¤³¤Î¥Õ¥é¥°¤ò»ØÄꤷ¤Ê¤«¤Ã¤¿¾ì¹ç¡¢¥·¥¹¥Æ¥à¥³¡¼¥ë¤Ï
¥Ç¥Õ¥©¥ë¥È¤ÇºÆ³«¤µ¤ì¤ë¡£
.TP
.B SV_RESETHAND
.\"O Reset the disposition of the signal to the default
.\"O before calling the signal handler.
.\"O If this flag is not specified, then the handler remains established
.\"O until explicitly removed by a later call to
.\"O .BR sigvec ()
.\"O or until the process performs an
.\"O .BR execve (2).
¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤ò¸Æ¤Ó½Ð¤¹Á°¤Ë¥·¥°¥Ê¥ë¤ÎÆ°ºî¤ò
¥Ç¥Õ¥©¥ë¥È¤Ë¥ê¥»¥Ã¥È¤¹¤ë¡£
¤³¤Î¥Õ¥é¥°¤ò»ØÄꤷ¤Ê¤«¤Ã¤¿¾ì¹ç¡¢¤â¤¦°ìÅÙ
.BR sigvec ()
¤ò¸Æ¤Ó½Ð¤·¤ÆÌÀ¼¨Åª¤Ëºï½ü¤µ¤ì¤ë¤«¡¢¥×¥í¥»¥¹¤¬
.BR execve (2)
¤ò¼Â¹Ô¤¹¤ë¤Þ¤Ç¡¢¥Ï¥ó¥É¥é¤ÏÀßÄꤵ¤ì¤¿¤Þ¤Þ¤È¤Ê¤ë¡£
.TP
.B SV_ONSTACK
.\"O Handle the signal on the alternate signal stack
.\"O (historically established under BSD using the obsolete
.\"O .BR sigstack ()
.\"O function; the POSIX replacement is
.\"O .BR sigaltstack (2)).
ÂåÂØ¥·¥°¥Ê¥ë¥¹¥¿¥Ã¥¯¾å¤Ç¥·¥°¥Ê¥ë¥Ï¥ó¥É¥é¤ò¼Â¹Ô¤¹¤ë
(Îò»ËŪ¤Ë¡¢BSD ¤Ç¤ÏÂåÂØ¥·¥°¥Ê¥ë¥¹¥¿¥Ã¥¯¤ÏÇѻߤµ¤ì¤¿´Ø¿ô
.BR sigstack ()
¤ò»È¤Ã¤ÆÀßÄꤹ¤ë¡£POSIX ¤Ç¤Ï¡¢Âå¤ï¤ê¤Ë
.BR sigaltstack (2)
¤ò»ÈÍѤ¹¤ë)¡£
.PP
.\"O The
.\"O .BR sigmask ()
.\"O function constructs and returns a "signal mask" for
.\"O .IR signum .
.\"O For example, we can initialize the
.\"O .I vec.sv_mask
.\"O field given to
.\"O .BR sigvec ()
.\"O using code such as the following:
´Ø¿ô
.BR sigmask ()
¤Ï
.I signum
¤ËÂФ¹¤ë¡Ö¥·¥°¥Ê¥ë¥Þ¥¹¥¯¡×¤ò¹½À®¤·¤ÆÊÖ¤¹¡£
Î㤨¤Ð¡¢°Ê²¼¤Î¤è¤¦¤Ê¥³¡¼¥É¤ò»È¤¦¤È¡¢
.BR sigvec ()
¤ËÅϤ¹
.I vec.sv_mask
¤ò½é´ü²½¤Ç¤­¤ë¡£
.nf

    vec.sv_mask = sigmask(SIGQUIT) | sigpause(SIGABRT);
                /* Block SIGQUIT and SIGABRT during
                   handler execution */
.fi
.PP
.\"O The
.\"O .BR sigblock ()
.\"O function adds the signals in
.\"O .I mask
.\"O to the process's signal mask
.\"O (like POSIX
.\"O .IR sigprocmask(SIG_BLOCK) ),
.\"O and returns the process's previous signal mask.
.\"O Attempts to block
.\"O .B SIGKILL
.\"O or
.\"O .B SIGSTOP
.\"O are silently ignored.
.BR sigblock ()
´Ø¿ô¤Ï¡¢
.I mask
¤Ë¤¢¤ë¥·¥°¥Ê¥ë¤ò¥×¥í¥»¥¹¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤ËÄɲä·
(POSIX ¤Î
.I sigprocmask(SIG_BLOCK)
¤ÈƱÍÍ)¡¢Êѹ¹Á°¤Î¥×¥í¥»¥¹¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤òÊÖ¤¹¡£
.B SIGKILL
¤ä
.B SIGSTOP
¤ò¥Ö¥í¥Ã¥¯¤·¤è¤¦¤È¤·¤¿¾ì¹ç¤Ë¤Ï¡¢ÌۤäÆ̵»ë¤µ¤ì¤ë¡£
.PP
.\"O The
.\"O .BR sigsetmask ()
.\"O function sets the process's signal mask to the value given in
.\"O .I mask
.\"O (like POSIX
.\"O .IR sigprocmask(SIG_SETMASK) ),
.\"O and returns the process's previous signal mask.
.BR sigsetmask ()
´Ø¿ô¤Ï¥×¥í¥»¥¹¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤ò
.I mask
¤Ç»ØÄꤵ¤ì¤¿ÃͤËÀßÄꤷ (POSIX ¤Î
.I sigprocmask(SIG_SETMASK)
¤ÈƱÍÍ)¡¢Êѹ¹Á°¤Î¥×¥í¥»¥¹¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤òÊÖ¤¹¡£
.PP
.\"O The
.\"O .BR siggetmask ()
.\"O function returns the process's current signal mask.
.\"O This call is equivalent to
.\"O .IR sigblock(0) .
.BR siggetmask ()
´Ø¿ô¤Ï¥×¥í¥»¥¹¤Î¸½ºß¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤òÊÖ¤¹¡£¤³¤Î´Ø¿ô¤Ï
.I sigblock(0)
¤ÈÅù²Á¤Ç¤¢¤ë¡£
.\"O .SH RETURN VALUE
.SH ÊÖ¤êÃÍ
.\"O The
.\"O .BR sigvec ()
.\"O function returns 0 on success; on error, it returns \-1 and sets
.\"O .I errno
.\"O to indicate the error.
.BR sigvec ()
´Ø¿ô¤ÏÀ®¸ù¤¹¤ë¤È 0 ¤òÊÖ¤¹¡£¥¨¥é¡¼¤Î¾ì¹ç¡¢\-1 ¤òÊÖ¤·¡¢
.I errno
¤Ë¥¨¥é¡¼¤ò¼¨¤¹Ãͤò¥»¥Ã¥È¤¹¤ë¡£

.\"O The
.\"O .BR sigblock ()
.\"O and
.\"O .BR sigsetmask ()
.\"O functions return the previous signal mask.
.BR sigblock ()
¤È
.BR sigsetmask ()
¤ÏÊѹ¹Á°¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤òÊÖ¤¹¡£

.\"O The
.\"O .BR sigmask ()
.\"O function returns the signal mask for
.\"O .IR signum .
.BR sigmask ()
´Ø¿ô¤Ï
.I signum
¤Î¥·¥°¥Ê¥ë¥Þ¥¹¥¯¤òÊÖ¤¹¡£
.\"O .SH ERRORS
.SH ¥¨¥é¡¼
.\"O See the ERRORS under
.\"O .BR sigaction (2)
.\"O and
.\"O .BR sigprocmask (2).
.BR sigaction (2)
¤È
.BR sigprocmask (2)
¤Î¡Ö¥¨¥é¡¼¡×¤ÎÀá¤ò»²¾È¡£
.\"O .SH "CONFORMING TO"
.SH ½àµò
.\"O All of these functions were in
.\"O 4.3BSD, except
.\"O .BR siggetmask (),
.\"O whose origin is unclear.
.\"O These functions are obsolete: do not use them in new programs.
¤³¤ì¤é¤Î´Ø¿ô¤Î¤¦¤Á
.BR siggetmask ()
°Ê³°¤ÎÁ´¤Æ¤Ï 4.3BSD ¤Ë¤¢¤Ã¤¿¡£
.BR siggetmask ()
¤Î½Ð¼«¤Ï¤Ï¤Ã¤­¤ê¤·¤Ê¤¤¡£
¤³¤ì¤é¤Î´Ø¿ô¤ÏÇÑ»ßͽÄê¤Ç¤¢¤ê¡¢¿·¤·¤¤¥×¥í¥°¥é¥à¤Ç¤Ï»ÈÍѤ·¤Ê¤¤¤³¤È¡£
.\"O .SH NOTES
.SH Ãí°Õ
.\"O On 4.3BSD, the
.\"O .BR signal ()
.\"O function provided reliable semantics (as when calling
.\"O .BR sigvec ()
.\"O with
.\"O .I vec.sv_mask
.\"O equal to 0).
4.3BSD ¤Ç¤Ï¡¢¿®ÍêÀ­¤Î¤¢¤ë¥·¥°¥Ê¥ë½èÍýµ¡¹½¤òÄ󶡤¹¤ë
.RI ( vec.sv_mask
¤ò 0 ¤Ç
.BR sigvec ()
¤ò¸Æ¤Ó½Ð¤·¤¿¤È¤­¤ÈƱÍÍ)¡£
.\"O On System V,
.\"O .BR signal ()
.\"O provides unreliable semantics.
System V ¤¬Ä󶡤¹¤ë½èÍýµ¡¹½¤Ï¿®ÍêÀ­¤Î¤Ê¤¤¤â¤Î¤Ç¤¢¤ë¡£
.\"O POSIX.1-2001 leaves these aspects of
.\"O .BR signal ()
.\"O unspecified.
.\"O See
.\"O .BR signal (2)
.\"O for further details.
POSIX.1-2001 ¤Ç¤Ï¡¢
.BR signal ()
¤Î¤³¤ÎÅÀ¤Ïµ¬Äꤷ¤Ê¤¤¤Þ¤Þ¤È¤Ê¤Ã¤Æ¤¤¤ë¡£
¤µ¤é¤Ê¤ë¾ÜºÙ¤Ë¤Ä¤¤¤Æ¤Ï
.BR signal (2)
¤ò»²¾È¡£

.\"O In order to wait for a signal,
.\"O BSD and System V both provided a function named
.\"O .BR sigpause (3),
.\"O but this function has a different argument on the two systems.
.\"O See
.\"O .BR sigpause (3)
.\"O for details.
BSD ¤È System V ¤Î¤É¤Á¤é¤Î¥·¥¹¥Æ¥à¤Ç¤â
¥·¥°¥Ê¥ë¤òÂԤĤ¿¤á¤Ë¡¢
.BR sigpause (3)
¤È¤¤¤¦Ì¾Á°¤Î´Ø¿ô¤¬Ä󶡤µ¤ì¤Æ¤¤¤ë¤¬¡¢
¤³¤Î´Ø¿ô¤Î°ú¤­¿ô¤ÏξÊý¤Î¥·¥¹¥Æ¥à¤Ç°Û¤Ê¤ë¡£
¾ÜºÙ¤Ï
.BR sigpause (3)
¤ò»²¾È¡£
.\"O .SH "SEE ALSO"
.SH ´ØÏ¢¹àÌÜ
.BR kill (2),
.BR pause (2),
.BR sigaction (2),
.BR signal (2),
.BR sigprocmask (2),
.BR raise (3),
.BR sigpause (3),
.BR sigset (3),
.BR signal (7)