.\" 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.\" manual page may be incorrect or out-of-date.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>
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Sun Feb 23 22:51:25 JST 1997
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\"
.\"WORD:	semaphore		ޥե
.\"WORD:	identifier		̻
.\"WORD:	owner			ͭ
.\"WORD:	group			롼
.\"WORD:	other			¾
.\"WORD:	effective user-ID	¸桼ID
.\"WORD:	effective group-ID	¸롼ID
.\"WORD:	process			ץ
.\"WORD:	policy			
.\"WORD:	structure		¤
.\"WORD:	initialize		
.\"WORD:	system call		ƥࡦ
.\"
.TH SEMGET 2 "November 1, 1993" "Linux 0.99.13" "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 
δؿ
.IR key
ͤ˴Ϣޥե(semaphore set)
̻(identifier)֤
.I key
ͤ
.B IPC_PRIVATE
ξˤ
.I nsems
ĤΥޥեʤ뿷礬롣
.I key

.BR IPC_PRIVATE 
ǤʤƤ
.IR key 
˴Ϣޥե礬¸ߤ
.I semflg

.B IPC_CREAT 
ꤵ줿(
.IB semflg " &"
.B IPC_CREAT
Ǥʤ)
ˤ
.I nsems
ĤΥޥեʤ뿷礬롣
.I semflg

.B IPC_CREAT

.B IPC_EXCL
ꤹȡ
.BR open (2)
ƥࡦ mode 
.B O_CREAT

.B O_EXCL
ꤹΤƱ̤¸ߤ륻ޥեͥ褹롣
㤨
.I semflg

.B IPC_CREAT

.B IPC_EXCL
ξꤵ줿
.IR key
ˤĤƥޥե礬¸ߤƤ硢
.B semget
ؿϼԤ롣
.PP
ˡ
.I semflg
β 9 ӥåȤϥޥեΥ(ͭ(owner)
롼(group)¾(other))
.BR open (2)

.BR creat (2)
ƥࡦΥĥѥ᡼Ʊ̣ġ
(¹(execute)ĤϥƥˤäƻѤƤʤ
񤭹(write)Ĥϥޥեξѹ(alter)ĤȤƵǽ롣)
.PP
ˡδ֡ƥࡦϥƥࡦޥե
ǡ¤
.B semid_ds
롢¤Τ:
.IP
.B sem_perm.cuid

.B sem_perm.uid
ˤϸƤӽФץμ¸(effective)桼ID ꤵ롣
.IP
.B sem_perm.cgid

.B sem_perm.gid
ˤϸƤӽФץμ¸(effective)롼ID ꤵ롣
.IP
.B sem_perm.mode
β 9 ӥåȤˤ
.IR semflg
β 9 ӥåȤꤵ롣
.IP
.B sem_nsems
ˤ
.IR nsems
ͤꤵ롣
.IP
.B sem_otime
ˤ 0 ꤵ롣
.IP
.B sem_ctime
ˤϸߤλ郎ꤵ롣
.PP
ƥࡦ뤬ޥեʤ
.I nsems

.B 0
ˤǤ롣
¾ξ
.I nsems

.B 0
礭ʤФʤ餺semid ȤΥޥեκƱ
ʤФʤʤ
.RB ( SEMMSL )
.PP
⤷ޥե礬¸ߤʤСĤ졢
˲(destruction)ޡʤå롣
.SH ֤
硢֤ͤϥޥեμ̻()Ǥ롣
Ǥʤ
.B \-1
֤졢
.B errno
ˤΥ顼롣
.SH 顼
Ԥˤϡ
.B errno
ˤϰʲͤΤɤ줫ꤵ:
.TP 11
.B EACCES
.IR key
б륻ޥե¸ߤ뤬
ƤӽФץνˤĤƤΥĤʤ
.TP
.B EEXIST
.B key
б륻ޥե礬¸ߤ
.I semflg

.B IPC_CREAT

.BR IPC_EXCL
ꤵ줿
.TP
.B EIDRM
ޥե˺(delete)ޡ롣
.TP
.B ENOENT
.I key
б륻ޥե礬¸ߤ
.I semflg

.BR IPC_CREAT
ꤵƤʤ
.TP
.B ENOMEM
ޥեʤФʤʤǡ¤Τ
Τ˽ʬʥ꤬ƥ¸ߤʤ
.TP
.B ENOSPC
ޥեʤФʤʤƥΥޥե

.RB ( SEMMNI )
ޤϥƥΤΥޥեκ
.RB ( SEMMNS )
ĶƤޤ
.SH 
.B IPC_PRIVATE
ϥե饰եɤǤϤʤ
.B key_t
Ǥ롣
̤ͤ
.IR key
ȤƻѤ줿ʤСƥࡦ
.I semflg
β 9 ӥåȤƤ̵뤷
()ޥե롣
.PP
ʲ
.B semget
˱ƶ륻ޥեλ񸻤¤Ǥ:
.TP 11
.B SEMMNI
ƥΤΥޥեκ: ˰¸
.TP
.B SEMMSL
semid Υޥեκ: ¸(ߤ 500).
.TP
.B SEMMNS
ƥΤΥޥեκ: ˰¸
.B SEMMSL * SEMMNI
礭̵̣ͤǤ롣
.SH Х
.B IPC_PRIVATE
λѤƤƤ줿ޥեФ¾Υץ
뤳Ȥػߤ뤳ȤϤǤʤ
.PP
եƱͤˡޥեФƥץ¾Ūʥ
ݾڤͭˡϸߤΤȤ¸ߤʤ
.I semflg

.B IPC_CREAT

.B IPC_EXCL
ξꤹ뤳Ȥ()ޥե礬
ȤΤߤݾڤ롣ޥեؤ¾ŪޤǤʤ
.PP
γƥޥեˤĤƥǡ¤ΤϤΥƥࡦǤ
ʤΥǡ¤Τ뤿ˤ
.BR semctl (2)
¹Ԥ
ǥޥե
.B SETVAL

.B SETALL
̿Ԥɬפ롣
.SH 
SVr4, SVID.  SVr4 ˤ¾ EINVAL, EFBIG, E2BIG, EAGAIN, ERANGE, EFAULT 
Υ顼֤ˤĤƤεҤ롣
.SH Ϣ
.BR ftok (3),
.BR ipc (5),
.BR semctl (2),
.BR semop (2)