.\" 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.\" manual page may be incorrect or out-of-date.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
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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.
.\"
.\" 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>
.\" Modified Sun Feb 18 01:59:29 2001 by Andries Brouwer <aeb@cwi.nl>
.\" Modified 20 Dec 2001, Michael Kerrisk <mtk16@ext.canterbury.ac.nz>
.\" Modified 21 Dec 2001, aeb
.\"
.\" 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>
.\" Updated & Modified Sun Jun  3 10:17:38 JST 2001
.\"         by Yuichi SATO <ysato@h4.dion.ne.jp>
.\" Updated & Modified Wed Jan  2 16:23:21 JST 2002 by Yuichi SATO
.\"
.\"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 2001-12-21 "Linux 2.4.1" "Linux Programmer's Manual" 
.SH ̾
semctl \- ޥեԤʤ
.SH 
.nf
.B #include <sys/types.h>
.B #include <sys/ipc.h>
.B #include <sys/sem.h>
.sp
.BI "int semctl(int " semid ", int " semnum ", int " cmd ", ...);"
.fi
.SH 
ؿ
.B semctl
ϡ
.I semid
ǻꤵ줿ޥե (semaphore set) 
ޤϥޥե
.I semnun
ܤΥޥեФơ
.I cmd 
ǻꤵ줿Ԥʤ
(ޥեֹ 0 Ϥޤ)
.PP
δؿΰ 3 ġޤ 4 ĤǤ롣
 4 Ĥξϡ
.BI semctl( semid , semnum , cmd , arg );
ȤǸƤӽФ
ǡ 4 
.I arg
ηϡʲ
.B union semun
Ǥ롣
 
.nf
#if defined(__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
/*  semun  <sys/sem.h> ˴ޤޤƤ */
#else
/* X/OPEN ˽ʤмʬȤǰʲΤ褦ʤФʤʤ */
union semun {
      int val;                  /* SETVAL  */
      struct semid_ds *buf;     /* IPC_STAT, IPC_SET ѤΥХåե */
      unsigned short *array;    /* GETALL, SETALL Ѥ */
                                /* Linux ͭʬ: */
      struct seminfo *__buf;    /* IPC_INFO ѤΥХåե */
};
#endif
.fi
.PP
.I cmd
˻ǽͤ
.TP 12
.B IPC_STAT
ޥեΥǡ¤Τξ
.IB arg .buf
ǻؤ줿Хåեإԡ롣
.I semnum
̵뤵롣
ƤӽФץϤΥޥեФ
ɤ߹ߥθ¤ʤФʤʤ
.TP
.B IPC_SET
.IB arg .buf
ǻꤵ줿
.B semid_ds
¤ΤΥСΤĤͤ򥻥ޥեΥǡ¤Τ˽񤭹ߡ
.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
(顼֤ͤơ
.B errno

.BR EIDRM
ꤵ)
ƤӽФץμ¸ (effective) 桼ID ϥѡ桼
Υޥեκ (creator) ͭ (owner) ǤʤФʤʤ
.I semnum
̵뤵롣
.TP
.B GETALL
ƤΥޥե
.B semval
ͤ
.IB arg .array
֤
.I semnum
̵뤵롣
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B GETNCNT
ƥࡦϽ
.I semnum
ܤΥޥե
.B semncnt
 (
.I semnum
ܤΥޥե
.B semval
äԤäƤץο) ֤
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B GETPID
ƥࡦϽ
.I semnum
ܤΥޥե
.B sempid
 (
.I semnum
ܤΥޥե˺Ǹ
.B semop
¹Ԥץ pid) ֤
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B GETVAL
ƥࡦϽ
.I semnum
ܤΥޥե
.B semval
֤ͤ
ƤӽФץϤΥޥեɤ߹ߥθʤ
ʤʤ
.TP
.B GETZCNT
ƥࡦϽ
.I semnum
ܤΥޥե
.B semzcnt
 (
.I semnum
ܤΥޥե
.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

.I semnum
ܤΥޥե
.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 ֤
Ԥ硢
.B semctl

.B \-1
֤
.B errno
ˤΥ顼򼨤
ǤʤХƥࡦ
.I cmd
ˤäưʲǤʤ֤ͤ:
.TP 11
.B GETNCNT
.B semncnt
͡
.TP
.B GETPID
.B sempid
͡
.TP
.B GETVAL
.B semval
͡
.TP
.B GETZCNT
.B semzcnt
͡
.LP
.I cmd
ͤʳξ硢 0 ֤롣
.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
.I semid
̵ͤꤵ줿
.TP
.B EPERM
.I cmd

.B IPC_SET
ޤ
.B IPC_RMID
ꤵ졢ƤӽФץ
Υޥɤ¹Ԥ븢äƤʤ
.TP
.B ERANGE
.I cmd

.B SETALL
ޤ
.B SETVAL
ꤵ졢(ΥޥեΤɤ줫)
.B semval
ꤵͤ 0 꾮
.B SEMVMX
礭
.SH 
.BR IPC_INFO ,
.BR SEM_STAT ,
.B SEM_INFO
楳
.BR ipcs (8)
ץˤäƳ줿񸻤ˤĤƾ󶡤뤿˻Ѥ롣
ŪˤϤ proc ե롦ƥѤΤ˽
⤷ʤ
.LP
\fI¤ semid_ds\fP ¿Υեɤϡ
Linux 2.2 ǤûäLinux 2.4 ǤĹʤä
ˤϡglibc-2.1.91 ʹߤδĶ
ƥѥ뤹нʬǤ롣
ͥϿθƤӽФȸŤθƤӽФ
.I cmd
 IPC_64 ե饰Ƕ̤롣
.PP
ʲ
.B semctl
˱ƶ륻ޥեΥƥ:
.TP 11
.B SEMVMX
.BR semval
κ : ¸ (32767)
.LP
ܿ뤿ΰɤˡϡ 4 Ĥΰ
.B semctl
ƤӽФȤǤ롣 
.LP
Linux ˤơؿ
.B semctl
ϥƥࡦǤϤʤƥॳ
.BR ipc (2)
ȤäƼƤ롣
.SH 
SVr4, SVID.  SVr4 ˤ¾ EINVAL, EOVERFLOW 顼ˤĤƤεҤ롣
.SH Ϣ
.BR ipc (2),
.BR shmget (2),
.BR shmat (2),
.BR shmdt (2),
.BR ipc (5)