.\" 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.\" manual page may be incorrect or out-of-date.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 17:54:56 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 1 Jan 2002, Martin Schulze <joey@infodrom.org>
.\" Modified 4 Jan 2002, Michael Kerrisk <mtk.manpages@gmail.com>
.\" Modified, 27 May 2004, Michael Kerrisk <mtk.manpages@gmail.com>
.\"     Added notes on capability requirements
.\" Modified, 11 Nov 2004, Michael Kerrisk <mtk.manpages@gmail.com>
.\"	Language and formatting clean-ups
.\"	Added notes on /proc files
.\"	Rewrote BUGS note about semget()'s failure to initialize
.\"		semaphore values
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated 1997-02-23, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated 2003-04-08, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-03-01, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2006-07-20, Akihiro MOTOKI, LDP v2.36
.\"
.\"WORD:	semaphore		ޥե
.\"WORD:	identifier		̻
.\"WORD:	owner			ͭ
.\"WORD:	group			롼
.\"WORD:	other			¾
.\"WORD:	effective user ID	¸桼 ID
.\"WORD:	effective group ID	¸롼 ID
.\"WORD:	calling process		ƤӽФΥץ
.\"WORD:	process			ץ
.\"WORD:	policy			
.\"WORD:	structure		¤
.\"WORD:	initialize		
.\"WORD:	system call		ƥࡦ
.\"
.TH SEMGET 2 2004-05-27 "Linux" "Linux Programmer's Manual"
.SH ̾
semget \- ޥեμ̻Ҥ
.SH 
.nf
.B
#include <sys/types.h>
.B
#include <sys/ipc.h>
.B
#include <sys/sem.h>
.fi
.sp
.BI "int semget(key_t " key ,
.BI "int " nsems ,
.BI "int " semflg );
.SH 
.BR semget ()
ƥॳϡ
.I key
б륻ޥե (semaphore set) 
̻ (identifier) ֤
.I key
ͤ
.B IPC_PRIVATE
ξ硢⤷
.I semflg

.B IPC_CREAT
ꤵƤơ
.I key
б륻ޥե礬¸ߤʤ硢
.I nsems
ĤΥޥեʤ뿷礬롣
.PP
.I semflg

.B IPC_CREAT

.B IPC_EXCL
ξꤵ줿硢
.I key
б륻ޥե礬¸ߤȡ
.BR semget ()
ϼԤ
.I errno

.B EEXIST
ꤵ
(
.BR open (2)

.B O_CREAT | O_EXCL
ꤵ줿ưƱǤ)
.PP
ޥեˡ
.I semflg
β 9 ӥåȤϡΥޥե (ͭ (owner)롼 (group)
¾ (others) Ф) ĤȤƻѤ롣
ΥӥåȤ
.BR open (2)
ΰ
.I mode
ƱƱ̣Ǥ
(â¹ (execute) ĤϥޥեǤϰ̣
񤭹 (write) Ĥϥޥեͤѹ (alter) ĤȤƵǽ)
.PP
줿ޥեγƥޥեͤǤ
( POSIX.1-2001 Ƥ)
Linux ¾¿μƱͤ˥ޥեͤ 0 ˽뤬
ܿθץꥱǤϤưˤ٤ǤϤʤ
ץꥱŪ˥ޥե˾ͤǽ٤Ǥ롣
.\" In truth, every one of the many implementations that I've tested sets
.\" the values to zero, but I suppose there is/was some obscure
.\" implementation out there that does not.
.PP
Υޥեݡ
.BR semget ()
ϥޥեξݻǡ¤
.I semid_ds
򼡤Τ褦˽
.RI ( semid_ds
ˤĤƤ
.BR semctl (2)
򻲾):
.IP
.I sem_perm.cuid

.I sem_perm.uid
ˡƤӽФΥץμ¸ (effective) 桼 ID ꤹ롣
.IP
.I sem_perm.cgid

.I sem_perm.gid
ˡƤӽФΥץμ¸ (effective) 롼 ID ꤹ롣
.IP
.I sem_perm.mode
β 9 ӥåȤ
.I semflg
β 9 ӥåȤꤹ롣
.IP
.I sem_nsems

.I nsems
ͤꤹ롣
.IP
.I sem_otime
 0 ꤹ롣
.IP
.I sem_ctime
˸ߤλꤹ롣
.PP
ޥեκԤʤϡ
.I nsems
 (don't care ̣) 0 ꤷƤ褤
Ǥʤϡ
.I nsems
 0 礭ͤǤʤФʤ餺ޥե礢Υޥեκ
.RB ( SEMMSL )
ʲǤʤФʤʤ
.PP
ޥե礬¸ߤϡĤθԤ롣
.\" ˲ (destruction) ޡʤå롣
.SH ֤
硢ޥեμ̻ () ֤ͤȤʤ롣
Ԥ \-1 ֤졢
.I errno
˥顼򼨤ͤꤵ롣
.SH 顼
Ԥ硢
.I errno
ˤϰʲͤΤ줫Ĥꤵ:
.TP 11
.B EACCES
.I key
б륻ޥե¸ߤ뤬
ƤӽФΥץϤνؤΥĤʤ
.B CAP_IPC_OWNER
ѥӥƥäƤʤ
.TP
.B EEXIST
.I key
б륻ޥե礬¸ߤ
.I semflg
ˤ
.B IPC_CREAT

.B IPC_EXCL
ꤵƤ
.\" .TP
.\" .B EIDRM
.\" ޥե˺ (delete) ޡĤƤ롣
.TP
.B EINVAL
.I nsems
 0 꾮ޥե礢Υޥեκ
.RB ( SEMMSL )
礭
ޤϡ
.I key
б륻ޥե礬¸ߤ
.I nsems
νΥޥե礭
.TP
.B ENOENT
.I key
б륻ޥե礬¸ߤ
.I semflg

.B IPC_CREAT
ꤵƤ⤤ʤ
.TP
.B ENOMEM
ޥե褦Ȥǡ¤Τ
Τ˽ʬʥ꤬ƥ¸ߤʤ
.TP
.B ENOSPC
ޥե褦ȤȡƥΥޥե

.RB ( SEMMNI )
ƥΤΥޥեκ
.RB ( SEMMNS )
Τ줫ĶƤޤ
.SH 
SVr4, POSIX.1-2001.
.\" SVr4 ˤϡɲä EFBIG, E2BIG, EAGAIN, ERANGE, EFAULT
.\" Υ顼֤ˤĤƤεҤ롣
.SH 
.B IPC_PRIVATE
ϥե饰եɤ˻ꤹΤǤϤʤ
.I key_t
Ǥ롣
̤ͤ
.I key
˻ꤵȡ
.BR semget ()
.I semflg
β 9 ӥåȰʳ̵뤷
() ޥե롣
.PP
ޥեΥ꥽˴ؤ¤Τ
.BR semget ()
˱ƶڤܤΤʲ˵󤲤:
.TP 11
.B SEMMNI
ƥΤΥޥեκ: ˰¸
(Linux Ǥϡͤ
.I /proc/sys/kernel/sem
4եɤбɤ߽ФѹǤ)
.\"  /proc ե Linux 2.2 ǤѤǤʤ -- MTK
.TP
.B SEMMSL
semid Υޥեκ: ¸
(Linux Ǥϡͤ
.I /proc/sys/kernel/sem
1եɤбɤ߽ФѹǤ)
.TP
.B SEMMNS
ƥΤΥޥեκ: ˰¸
(Linux Ǥϡͤ
.I /proc/sys/kernel/sem
2եɤбɤ߽ФѹǤ)
.B SEMMSL * SEMMNI
礭ͤϰ̣ʤ
.SH Х
.B IPC_PRIVATE
Ȥ̾ΤϤ餯ԤǤ
.B IPC_NEW
ΤˤεǽɽƤ
.LP
ޥեΥޥե
.BR semget ()
ǤϽʤ
.\" ºݤ Linux Ǥϥޥե 0 ˽뤬
.\" POSIX.1-2001 ǤϤʤ뤳ȤꤷƤǤϤʤΤǡ
.\" ܿθȤˤϤˤƤϤʤ
ΥޥեˤϡޥեФ
.BR semctl (2)
Ȥä
.B SETVAL

.B SETALL
¹Ԥɬפ롣
(ʣս꤫饻ޥեԤ̤Ǥϡ
ïǽ˽Ф褤ʬʤ
ξ򤱤ˤϡ
.BR semctl (2)

.B IPC_STAT
ǼǤ륻ޥեΥǡ¤Τ
.I sem_otime
 0 ʳˤʤäƤ뤫åФ褤)
.SH Ϣ
.BR semctl (2),
.BR semop (2),
.BR ftok (3),
.BR capabilities (7),
.BR sem_overview (7),
.BR svipc (7)