.\" Copyright 1993 Giorgio Ciucci (giorgio@crcc.it)
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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 Tue Oct 22 17:55:06 1996 by Eric S. Raymond <esr@thyrsus.com>
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Sun Feb 23 22:53:35 JST 1997
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\"
.\"WORD:	semaphore		ޥե
.\"WORD:	member			С
.\"WORD:	process			ץ
.\"WORD:	system call		ƥࡦ
.\"WORD:	undo			ɥ
.\"WORD:	signal			ʥ
.\"WORD:	catch			(catch)
.\"WORD:	process-ID		ץID
.\"WORD:	policy			
.\"WORD:	implement		
.\"WORD:	queue			塼
.\"WORD:	free			(free)
.\"WORD:	memory			
.\"
.TH SEMOP 2 "November 1, 1993" "Linux 0.99.13" "Linux Programmer's Manual" 
.SH ̾
semop \- ޥե(semaphore)
.SH 
.nf
.B
# include <sys/types.h>
.B
# include <sys/ipc.h>
.B
# include <sys/sem.h>
.fi
.sp
.BI "int semop ( int " semid ,
.BI "struct sembuf *" sops ,
.BI "unsigned " nsops " )"
.SH 
δؿ
.IR semid
ǻꤵ줿ޥե(semaphore set)ΥС롣
.I sops
ˤäƻؤ
.B sembuf 
¤Τ
.I nsops
ĤǤϥޥեФꤹ롣
.B "sembuf ¤"
ϰʲΥСޤǤ:
.sp
.B
.br
.B
	short sem_num;	
/* semaphore number: 0 = first */
.br
.B
	short sem_op;	
/* semaphore operation */
.br
.B
	short sem_flg;	
/* operation flags */
.sp
.B sem_flg
ˤ
.B IPC_NOWAIT

.BR SEM_UNDO 
Ǥ롣
.BR SEM_UNDO
ꤵ줿ϤΥץ(process)λ(exit)
Ȥᤵ롣
.PP
Υƥࡦ(system call)ϤƤ
ˡƤξˤΤ߼¹Ԥ뤳Ȥݾڤ롣
줾ϥޥե
.BR sem_num 
ΥޥեФƼ¹Ԥ롣\- ޥեκǽϥޥե
.B 0
Ǥ롣
\- ϰʲλĤΤɤ줫Ǥ롣
.PP
⤷
.B sem_op
οʤСȤƤͤ
.BR  semval
˲ä롣ˤ
.B SEM_UNDO
ꤵƤϡƥϤΥޥե ץɥ
(process undo count)򹹿롣
Ͼ̲ᤷץ(sleep)ϵʤ
ƤӽФץϤΥޥեѹĤʤФʤʤ
.PP
⤷
.B sem_op
ʤСץϤΥޥեФɤ߹ߤεĤ
Фʤʤ
⤷
.B semval
ʤС̲᤹롣Ǥʤ
.BR sem_flg

.B IPC_NOWAIT
ꤵƤХƥࡦϼԤ(ƤνȤ
ᤷ)
.B errno

.BR EAGAIN
ꤹ롣Ǥʤ
.B semzcnt
 1 äơʲξޤǥץ(sleep):
.IP
.RS
.IP \(bu
.B semval
 0 ˤʤ롢λ
.B semzcnt
 1 롣
.IP \(bu
ޥե礬: ƥࡦ뤬Ԥ
.B errno

.BR EIDRM
ꤵ롣
.IP \(bu
ƤӽФץ(catch)٤ʥ(signal):
.B semzcnt
ͤ 1 ƥࡦϼԤ
.B errno

.BR EINTR
ꤵ롣
.RE
.PP
⤷
.B sem_op
̤ʤСץϤΥޥեѹĤɬפǤ롣
.B semval

.BR sem_op
ͤ礭ϡ
.BR semval

.B sem_op
ͤ
ˡ
.B SEM_UNDO
ꤵƤϡΥޥեΥץɥ򹹿롣
줫̲᤹롣
Ǥʤ
.BR sem_flg

.B IPC_NOWAIT
ꤵ줿ϡƥࡦϼԤ(ƤνȤ
ᤷ)
.B errno

.BR EAGAIN
ꤹ롣Ǥʤ
.B semncnt
 1 äơʲΤɤ줫ޤǥץ(sleep):
.IP
.RS
.IP \(bu
.B semval

.BR sem_op
ͤ礭λ
.B semncnt
 1
.B semval

.B sem_op
ͤ롣
.B SEM_UNDO
ꤵ줿ˤϤΥޥեΥץɥ򹹿롣
.IP \(bu
ޥե礬ƥफ줿: ƥࡦϼԤ
.B errno

.BR EIDRM
ꤵ롣
.IP \(bu
ƤӽФץ(catch)٤ʥ(signal):
.B semncnt
ͤ 1 ƥࡦϼԤ
.B errno

.BR EINTR
ꤵ롣
.RE
.PP
硢
.I sops
ˤäƻؤ줿ǻꤵ줿ޥե
.B sem
¤Τ
.B sempid
СˤϸƤӽФץΥץ ID ꤵ롣

.B sem_otime

.B sem_ctime
ξ˸߻郎ꤵ롣
.SH ֤
ϥƥࡦ
.BR 0
֤Ǥʤ
.B \-1
֤
.B errno
ˤΥ顼򼨤
.SH 顼
Ԥϡ
.B errno
˰ʲͤΤɤ줫ꤹ:
.TP 11
.B E2BIG
.I nsops

.BR SEMOPM
礭
.BR SEMOPM
ϰΥƥࡦǵκ
.TP
.B EACCES
ƤӽФץΥޥե˻ꤵ줿ԤʤΤ
ɬפʥĤäƤʤ
.TP
.B EAGAIN
̲Ǥ
.IB sem_flg

.BR IPC_NOWAIT
ꤵƤ롣
.TP
.B EFAULT
.I sops
ǻؤƤ륢ɥ쥹˥Ǥʤ
.TP
.B EFBIG
ǡ
.B sem_num
ͤ 0 ̤Ǥ뤫ΥޥեοʾǤ롣
.TP
.B EIDRM
ޥե礬줿
.TP
.B EINTR
Ԥ塼(queue)ߤƤ˥ץͤ٤ʥ
.TP
.B EINVAL
ޥե礬¸ߤʤޤ
.I semid
 0̤ޤ
.I nsops
οǤʤ
.TP
.B ENOMEM

.B sem_flg

.B SEM_UNDO
ꤵ줿ƥ˥ɥ¤Τ˳Ƥ뽽ʬʥ꤬ʤ
.TP
.B ERANGE

.B semop+semval

.BR SEMVMX
礭
.BR SEMVMX
ϼ¸
.BR semval
κ͡
.SH 
ץ
.B sem_undo
¤Τ
.BR fork (2)
ƥࡦμ¹Ԥ˺ݤƻҥץˤϷѾʤ
.BR execve (2)
ƥࡦμ¹Ԥξäץ˷Ѿ롣
.PP
ʲ
.B semop
˴Ϣ륻ޥեλ񸻤¤Ǥ:
.TP 11
.B SEMOPM

.B semop
ǵκ: ˰¸
.TP
.B SEMVMX
.BR semval
Ϳ: ¸(32767)
.PP
Linux ˤ
ǤϰʲΤΤ˥ƥͭ¤Ϥʤ
λν(adjust on exit)κ
.RB ( SEMAEM )
ƥΤΥɥ¤Τκ
.RB ( SEMMNU )
ץΥɥ¤Τκ
.SH Х
ƥϥץȤ
.B sem_undo
¤Τ򥢥ɥ׵դѹ줿ޥեȤݻƤ롣
ι¤Τϥץλ(exit)˲(free)롣
ΥɥԹʤȤΰĤϥޥեʬǽ(atomic)
ȤȤȤǰˤդ路ʤȤǤ롣
ȤγƥޥեؤΥɥ׵¿
.B semop
ѤȤʤäƤ뤫⤷ʤ
λ˥ץ(sleep)٤Ȥ
ƤΥɥФ
.B IPC_NOWAIT
ե饰θ̤ŬѤ٤  ΤȤΥɥ
ϤŬѤ졢Ԥ׵᤹褦ۤä̵뤵롣
Τ褦ˡ̵ʥɥλѤϻŪ(private)ʥޥեǤΤݾڤ롣
.SH 
SVr4, SVID.  SVr4 ˤ¾ EINVAL, EFBIG, ENOSPC Υ顼֤ˤĤƤ
Ҥ롣
.SH Ϣ
.BR ipc (5),
.BR semctl (2),
.BR semget (2)