.\" Hey Emacs! This file is -*- nroff -*- source.
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.\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
.\"
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.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
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.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
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.\" 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.\" manual page may be incorrect or out-of-date.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
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.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\" License.
.\"
.\" Modified Sat Jul 24 13:30:06 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified Sun Aug 21 17:42:42 1994 by Rik Faith <faith@cs.unc.edu>
.\"          (Thanks to Koen Holtman <koen@win.tue.nl>)
.\" Modified Wed May 17 15:54:12 1995 by Rik Faith <faith@cs.unc.edu>
.\"           To remove *'s from status in macros (Thanks to Michael Shields).
.\" Modified as suggested by Nick Duffek <nsd@bbc.com>, aeb, 960426
.\" Modified Mon Jun 23 14:09:52 1997 by aeb - add EINTR.
.\" Modified Thu Nov 26 02:12:45 1998 by aeb - add SIGCHLD stuff.
.\" Modified Mon Jul 24 21:37:38 2000 by David A. Wheeler
.\"          <dwheeler@dwheeler.com> - noted thread issues.
.\" Modified 26 Jun 01 by Michael Kerrisk
.\"          Added __WCLONE, __WALL, and __WNOTHREAD descriptions
.\" Modified 2001-09-25, aeb
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Tue Mar  4 00:14:47 JST 1997
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified Mon Sep 23 21:33:23 JST 2000
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated Mon Jun 25 JST 2001 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated Mon Oct 15 JST 2001 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated Thu Dec 13 JST 2001 by Kentaro Shirakata <argrath@ub32.org>
.\"
.\"WORD:	signal handling		ʥ
.\"WORD:	suspend			(suspend)
.\"WORD:	zombie			(zombie)
.\"WORD:	child process		ҥץ
.\"WORD:	process group		ץ롼
.\"WORD:	process group ID	ץ롼ID
.\"WORD:	stop			(stop)
.\"WORD:	effective user ID	¸桼ID
.\"WORD:	block			ػ(block)
.\"
.TH WAIT 2  2000-07-24 "Linux" "Linux Programmer's Manual"
.SH ̾
wait, waitpid \- ץνλԤ
.SH 
.B #include <sys/types.h>
.br
.B #include <sys/wait.h>
.sp
.BI "pid_t wait(int *" "status" );
.br
.BI "pid_t waitpid(pid_t " pid ", int *" status ", int " options );
.SH 
.B wait
ؿϻҶλ(exit)롢뤤ϸߤΥץʥ
Ȥäƽλ뤫ʥؿ(signal handling function)
ƤӽФޤǸߤΥץμ¹Ԥ(suspend)롣
⤷ƤӽФ˴˻ҥץλƤ
("(zombie)"ץȸƤФ)ˤϤδؿϤ˽λ롣
ҥץˤäƻѤƤƥλ񸻤Ʋ롣

.B waitpid
ؿϰ
.I pid
ǻꤵ줿Ҷλ롢뤤ϸߤΥץʥ
Ȥäƽλ뤫ʥؿƤӽФޤ
ߤΥץμ¹Ԥߤ롣⤷ƤӽФ줿˴
.I pid
ǻꤵ줿ҥץλƤ(ӡץȸƤФ)
ˤϤδؿϤ˽λ롣
ҥץˤäƻѤƤƥλ񸻤Ʋ롣

.I pid
ͤϰʲΤɤ줫:
.IP "< \-1"
 ץ롼(process group)ID ͤ
.I pid 
ҥץɤ줫λޤǤԤĤȤ̣롣
.IP \-1
ϻҥץΤɤ줫λޤԤĤȤ̣; 
.B wait
θƤӽФǤ롣
.IP 0
ϥץ롼ID ƤӽФץʻҥץԤ
Ȥ̣롣
.IP "> 0"
ϥץID  
.I pid
ҥץԤĤȤ̣롣
.PP
.I options
ͤϰʲƤΥİʾ¤Ǥ:
.TP
.B WNOHANG
Ϥ⤷ԤĤ٤ҥץ¸ߤʤˤϤ֤뤳Ȥ̣롣
.TP
.B WUNTRACED
ϻҶ(stop)Ƥˤ֤뤳Ȥ̣롣
(status)𤵤ʤ
.PP
(Linux ѥץˤĤƤϸҤ)
.PP
⤷
.I status
 
.B NULL 
ǤʤʤС
.B wait
ޤ
.B waitpid

.I status
ǻꤵ줿˾־Ǽ롣

ξ֤ϰʲΥޥȤäɾǤ(Υޥϰ
 \(em ֥ХåեؤΥݥ󥿡Ǥʤ \(em ֥Хåե
(\fBint\fR) ):
.TP
.BI WIFEXITED( status )
Ϥ⤷Ҷ̾˽λˤϥʳǤ롣
.TP
.BI WEXITSTATUS( status )
Ͻλҥץ
.B exit
ƤӽФΰ main ؿǼ¹Ԥ줿
.B return
ʸΰꤵ롣Υޥ
.B WIFEXITED
ǤʤɾǤ롣
.TP
.BI WIFSIGNALED( status )
ϻҥץ(catch)Ƥʤʥˤäƽλ˿֤
.TP
.BI WTERMSIG( status )
ϻҥץλʥֹ֤Υޥ
.B WIFSIGNALED
ʳξΤɾǤ롣
.TP
.BI WIFSTOPPED( status )
Ϥ⤷֤äƤͳȤʤäҥץ(stop)Ƥ
˿֤
.BR WUNTRACED 
ѤˤΤߤꤨ롣
.TP
.BI WSTOPSIG( status )
ϻҶߤʥֹ֤Υޥ
.B WIFSTOPPED
ʳξΤɾǤ롣
.LP
Ĥ Unix ΥС(㤨 Linux  Solaris Ϥ
AIX  SunOS ƤϤޤʤ)Ǥ
.BI WCOREDUMP( status )
ޥƤ롣ϻҥץ core Ϥɤ
Ĵ٤Τ˻Ѥ롣#ifdef WCOREDUMP ... #endif dzäƻѤ뤳ȡ
.SH ֤
λҶΥץ ID ֤롣

.B WNOHANG
ѤƤŬڤʻҶ¸ߤʤˤ 0 
顼ξ \-1 ֤롣(ξˤ
.I errno
Ŭڤꤵ롣)
.SH 顼
.TP
.B ECHILD
.I pid
ǻꤷץ¸ߤʤƤӽФץλҥץǤʤ
(SIGCHLD  SIG_IGN ꤷˤϼʬȤλҶǤ⤳ʤ롣
 աפ⻲Ȥ뤳ȡ)
.TP
.B EINVAL
.I options
Ǥ롣
.TP
.B EINTR
.B WNOHANG
ꤵƤʤƶػ(block)Ƥʤʥ
.B SIGCHLD

.SH 
Single Unix Specification ˤ (Linux ǤϥݡȤƤʤ)
SA_NOCLDWAIT ե饰ˤĤƤεҤ롣Υե饰ꤵƤ뤫
SIGCHLD ưȤ SIG_IGN ꤵ줿
(Ǥ POSIX ǤϵƤʤ)ˤϡ
λҥץϥӤˤʤ뤳Ȥʤ
.I wait()

.I waitpid()
ƤӽФȻҥץλޤ(block)롣
.I errno
 ECHILD ꤵƼԤ롣
.SH "Linux Ǥ"
Linux ͥǤϡͥˤäƥ塼뤵륹åɤ
뼫ʥץιǤǤϤʤˡåɤ Linux ͭ
.BR clone (2)
ƥࡦѤñʥץ˲᤮ʤ
.BR pthread_create (3)
Τ褦¾ΰܿΤ롼
.BR clone (2)
ѤƼƤ롣
Linux 2.4 ǤϡåɤñüʥץǤäΤǡ
㤨Ʊåɥ롼פǤäƤ⡢
륹åɤ¾ΥåɤλҶλΤԤĤȤϽʤä
POSIX ǤϤΤ褦ʵǽꤷƤꡢLinux 2.4 ʹߤ
åɤǤϤ줬褦ˤʤä
ƥǥեȤǤƱåɥ롼פ¾ΥåɤλҶ
λΤԤġ
.LP
ʲ Linux ͭ
.I options

.BR clone (2)
Ѥƺ줿ҶΤѤ롣
.TP
.B __WCLONE
"clone" λҶԤġ
ꤵʤä "clone" λҶԤ
("clone" λҶʥȯʤ
ޤϽλ˿Ƥ
.B SIGCHLD
ʥ뤷ȯʤ)
Υץ
.B __WALL
ꤵƤ̵뤵롣
.TP
(Linux 2.4 ʹߤǤ) "clone"   "clone" ˴ؤ餺
ƤλҶԤġ
.TP
(Linux 2.4 ʹߤǤ) Ʊåɥ롼פ¾ΥåɤλҶԤʤ
 Linux 2.4 ΥǥեȤǤ롣
.SH 
SVr4, POSIX.1
.SH Ϣ
.BR clone (2),
.BR signal (2),
.BR wait4 (2),
.BR pthread_create (3),
.BR signal (7)