.\" 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.\" manual page may be incorrect or out-of-date.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 17:53:56 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified Fri Jun 19 10:59:15 1998 by Andries Brouwer <aeb@cwi.nl>
.\"
.\" Japanese Version Copyright (c) 1997,1998 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Sun Feb 23 22:49:48 JST 1997
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified Thu Sep 10 00:05:24 JST 1998
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\"
.\"WORD:	semaphore		ޥե
.\"WORD:	union			
.\"WORD:	buffer			Хåե
.\"WORD:	member			С
.\"WORD:	superuser		ѡ桼
.\"WORD:	effective uid		¸桼ID
.\"WORD:	creator			
.\"WORD:	owner			ͭ
.\"WORD:	entry			ȥ
.\"WORD:	undo			ɥ
.\"WORD:	implement		
.\"WORD:	queue			塼
.\"
.TH SEMCTL 2 "November 1, 1993" "Linux 0.99.13" "Linux Programmer's Manual" 
.SH ̾
semctl \- ޥեԤʤ
.SH 
.nf
.B
#include <sys/types.h>
.B
#include <sys/ipc.h>
.B
#include <sys/sem.h>

#if defined(__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
/*  semun  <sys/sem.h> ˴ޤޤƤ */
#else
/* X/OPEN ˽ʤмʬȤǰʲΤ褦ʤФʤʤ */
union semun {
	int val;                    /* value for SETVAL */
	struct semid_ds *buf;       /* buffer for IPC_STAT, IPC_SET */
	unsigned short int *array;  /* array for GETALL, SETALL */
	struct seminfo *__buf;      /* buffer for IPC_INFO */
};
#endif
.fi
.sp
.BI "int semctl (int " semid ,
.BI "int " semnum ,
.BI "int " cmd ,
.BI "union semun " arg )
.SH 
δؿ
.IR semid
ǻꤵ줿ޥե(semaphore set)(ޤ
ޥե
.IR semnun 
Υޥե)
.I cmd
ꤵ줿ԤʤκǽΥޥե
.IR semnun

.B 0
Ǽ롣
.PP
.sp
.I cmd
ͤ
.TP 12
.B IPC_STAT
ޥեΥǡ¤Τξ
.IB arg .buf \fR.
ǻؤ줿Хåեإԡ롣
.I semnum
̵뤵롣ƤӽФץϤΥޥեФ
ɤ߹ߥθ¤ʤФʤʤ
.TP
.B IPC_SET
.IB arg .buf
ǻꤵ줿
.B semid_ds
¤ΤΥСΤĤͤ򥻥ޥեΥǡ¤Τ˽񤭹ࡢ
.B sem_ctime
Сͤ⹹롣
.IB arg .buf
ˤäƻꤵ桼Ϳ
.B "semid_ds ¤"
ΤθСϰʲ̤
.nf
.sp
.ft B
	sem_perm.uid
	sem_perm.gid
	sem_perm.mode	\fR/* only lowest 9-bits */\fP
.fi
.ft R
.sp
ƤӽФץμ¸(effective)桼ID ϥѡ桼
Υޥեκ(creator)ͭ(owner)ǤʤФʤʤ
.I semnum
̵뤵롣
.TP
.B IPC_RMID
ޥեȤΥǡ¤Τ򤿤˺(remove)
Ԥ֤ˤץܳФᤵ(
.B errno

.BR EIDRM
ꤵ졢顼Ȥ֤뤳Ȥˤ롣)
ƤӽФץμ¸(effective)桼ID ϥѡ桼
Υޥեκ(creator)ͭ(owner)ǤʤФʤʤ
.I semnum
̵뤵롣
.TP
.B GETALL
ƤΥޥե
.B semval
ͤ
.IB arg .array \FfR
֤
.I semnum
̵뤵롣
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B GETNCNT
ƥࡦϽ
.IR semnum 
Υޥե
.B semncnt
֤ͤ(
.IR semnum 
Υޥե
.B semval
äԤäƤץο)
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B GETPID
ƥࡦϽ
.IR semnum 
Υޥե
.B sempid
֤ͤ(
.IR semnum 
Υޥե˺Ǹ
.B semop
¹Ԥץ pid)
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B GETVAL
ƥࡦϽ
.IR semnum 
Υޥե
.B semval
֤ͤ
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B GETZCNT
ƥࡦϽ
.IR semnum 
Υޥե
.B semzcnt
֤ͤ(
.IR semnum 
Υޥե
.B semval
ͤ 0 ˤʤΤԤäƤץο)
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B SETALL
ƤΥޥե
.B semval

.IB arg .array
ǻꤵ줿ͤꤹ롣
ν
.B semid_ds
¤Τ
.B sem_ctime
Сͤ⹹롣
ƤΥץΥޥեѹˤĤƤΥɥȥ
õ(clear)롣
.B semval
ͤ 0 ˤʤ뤫äԤ塼(queue)(sleep)Ƥ
ץϺƳ(awake)롣
.I semnum
̵뤵롣
ƤӽФץϤΥޥեѹθʤ
ʤʤ
.TP
.B SETVAL

.IR semnum ܤ
ޥե
.B semval

.IB arg .val
ͤꤹ롣ν˴Ϣ
.B semid_ds
¤Τ
.B sem_ctime
Сͤ⹹롣
ƤΥץΥޥեѹˤĤƤΥɥȥϾõ롣
.B semval
ͤ 0 ˤʤ뤫äԤ塼(queue)(sleep)Ƥ
ץϺƳ(awake)롣
ƤӽФץϤΥޥեѹθʤ
ʤʤ
.SH ֤
Ԥϥƥࡦ
.B \-1
֤
.B errno
ˤΥ顼򼨤
ǤʤХƥࡦ
.I cmd
ˤäưʲǤʤ֤ͤ:
.TP 11
.B GETNCNT
.BR semncnt
͡
.TP
.B GETPID
.BR sempid
͡
.TP
.B GETVAL
.BR semval
͡
.TP
.B GETZCNT
.BR semzcnt
͡
.SH 顼
Ԥ
.B errno
ˤϰʲͤΤɤ줫ꤵ:
.TP 11
.B EACCES
ƤӽФץ
.IR cmd 
¹ԤΤɬפʥĤäƤʤ
.TP
.B EFAULT
.IB arg .buf
ޤ
.IB arg .array
ǻؤƤ륢ɥ쥹˥뤳ȤǤʤ
.TP
.B EIDRM
ޥե礬(remove)줿
.TP
.B EINVAL
.I cmd
ޤ
.IR semid
̵ͤꤵ줿
.TP
.B EPERM
.I cmd

.B IPC_SET
ޤ
.B IPC_RMID
ꤵ졢ƤӽФץμ¸(effective)桼ID 
Υޥɤ¹Ԥ븢äƤʤ
.TP
.B ERANGE
.I cmd

.B SETALL
ޤ
.B SETVAL
ꤵ졢(ΥޥեΤɤ줫)
.B semval
ꤵͤ 0 꾮
.BR SEMVMX
礭
.SH 
.BR IPC_INFO

.BR SEM_STAT

.B SEM_INFO
楳
.BR ipcs (8)
ץˤäƳ줿񸻤ˤĤƾ󶡤뤿˻Ѥ롣
ŪˤϤ proc ե롦ƥѤΤ˽
⤷ʤ
.PP
ʲ
.B semctl
˱ƶ륻ޥեΥƥ:
.TP 11
.B SEMVMX
.BR semval
κ : ¸(32767)
.SH 
SVr4, SVID.  SVr4 ˤ¾ EINVAL, EOVERFLOW 顼ˤĤƤεҤ롣
.SH Ϣ
.BR ipc (5),
.BR shmget (2),
.BR shmat (2),
.BR shmdt (2)