.\" 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.\" manual page may be incorrect or out-of-date.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 16:40:11 1996 by Eric S. Raymond <esr@thyrsus.com>
.\"
.\" Japanese Version Copyright (c) 1997 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Sun Feb 23 16:59:36 JST 1997
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\"
.\"WORD:	message			å
.\"WORD:	operation		
.\"WORD:	queue			塼
.\"WORD:	process			ץ
.\"WORD:	catch			(catch)
.\"WORD:	signal			ʥ
.\"WORD:	suspend			(suspend)
.\"WORD:	sleep			(sleep)
.\"WORD:	block			(block)
.\"WORD:	process-ID		ץID
.\"WORD:	type			
.\"WORD:	policy			
.\"WORD:	super-user		ѡ桼
.\"WORD:	current time		߻
.\"WORD:	implement		
.\"
.TH MSGOP 2 "November 1, 1993" "Linux 0.99.13" "Linux Programmer's Manual" 
.SH ̾
msgop \- å(message)
.SH 
.nf
.B
# include <sys/types.h>
.br
.B
# include <sys/ipc.h>
.br
.B
# include <sys/msg.h>
.fi
.sp
.BI "int msgsnd ( int " msqid ,
.BI "struct msgbuf *" msgp ,
.BI "int " msgsz ,
.BI "int " msgflg " )"
.sp
.BI "int msgrcv ( int " msqid ,
.BI "struct msgbuf *" msgp ,
.BI "int " msgsz ,
.BI  "long " msgtyp ,
.BI "int " msgflg " )"
.SH 
å(message)äꤹ뤿
ƤӽФץϰʲΤ褦ʹ¤ΤƤ롣
.sp
.B
	struct msgbuf {
.br
.B
		long	mtype;	
/* message type, must be > 0 */
.br
.B
		char	mtext[1];	
/* message data */
.br
.B
	};
.sp

.B mtext
礭
.IR msgsz 
ǤʤФʤʤ
¤ΤΥС
.B mtype
ϥåȤץˤäƥåǤ褦
̩ǤʤФʤʤ(
.BR msgrcv 
򸫤衣)
.PP
ƤӽФץϥå뤿ˤϥ塼(queue)ؤ
񤭹ߵĤ򡢥å뤿ˤϥ塼ؤɤ߹ߵĤ
ʤФʤʤ
.PP
.B msgsnd
ƥࡦ
.I msgp
ǻꤵ줿åΥԡ
.I msqid
ͤǻꤵ줿å塼롣
.PP
.I msgflg
ϡå򥭥塼Τ˥塼
.B msg_qbytes
¿ɬפʾưꤹ롣
.B IPC_NOWAIT
ꤵ줿硢å줺ƥࡦϼԤ
.B errno

.BR EAGAIN
ꤷ֤롣ǤʤСΤ褦ʾʤʤ뤫
塼뤫ץ(catch)٤ʥ(signal)
ޤǡץ(process)μ¹Ԥ(suspend)롣
(ߤ褦ʾʤʤХåƥƥࡦ
롢塼줿ϥƥࡦϼԤ
.B errno

.BR EIDRM 
ꤵ롢ʥȤäϥƥࡦϼԤ
.B errno

.BR EINTR
ꤵ롣)
.PP
ˤϥå塼ǡ¤ΤϰʲΤ褦
:
.IP
.B msg_lspid
ˤϸƤӽФץΥץ ID ꤵ롣
.IP
.B msg_qnum
 1 ä롣
.IP
.B msg_stime
ˤϸ߻郎ꤵ롣
.PP
.B msgrcv
ƥࡦ
.I msqid
ǻꤷå塼
.I msgp
ˤäƻꤵ줿
.B msgbuf
¤ΤؤȥåɤߤȤꡢˤϡ塼ɤ
å롣
.PP
.I msgsz
ˤ
.I msgp
ǻꤵ줿¤Τ
.B mtext
СκΥХȿꤹ롣
⤷åΥƥȤĹ
.IR msgsz 
礭ˤϡ
.I msgflg

.BR MSG_NOERROR
ꤵƤХåΥƥȤڤͤ롢
ǤʤХåϥ塼줺
ƥࡦϼԤ
.B errno

.BR E2BIG
ꤵ롣
.PP
.I msgtyp
׵ᤷåη(type)ʲΤ褦Ϳ:
.IP
.I msgtyp

.BR 0 
ʤС塼κǽˤåɤ߹ޤ롣
.IP
.I msgtyp
 
.BR 0 
礭С
.I msgflg

.B MSG_EXCEPT
ꤵƤʤХ塼κǽ
.I msgtyp
Υåɤ߹ޤ롣
.B MSG_EXCEPT
ꤵƤϥ塼κǽ
.I msgtyp
ʳΥåɤ߹ޤ롣
.IP
.I msgtyp

.BR 0
꾮С
.I msgtyp
ͰʲκǤ⾮ĥ塼κǽΥåɤ߹ޤ롣
.PP
.I msgflg
ˤϰʲΥե饰 0, 1, ʣ( OR)Ϳ:
.IP
.B IPC_NOWAIT
塼׵ᤵ줿ΥåʤˤϤ֤롣
ƥࡦϼԤ errno ˤ
.BR ENOMSG
ꤵ롣
.IP
.B MSG_EXCEPT
.B 0
礭
.I msgtyp
Ȱ˻Ѥơ
塼κǽ
.IR msgtyp
ʳΥåɤࡣ
.IP
.B MSG_NOERROR
.I msgsz
ХȤĹäϥåΥƥȤڤͤ롣
.PP
׵ᤵ줿Υå¸ߤ
.IR msgflg

.B IPC_NOWAIT
ꤵƤʤä硢ʲξޤǸƤӽФץ
(block):
.IP
Ƥ뷿Υå塼줿
.IP
å塼ƥफ줿
ξϥƥࡦϼԤ
.B errno

.BR EIDRM 
ꤵ롣
.IP
ƤӽФץͤ٤ʥ
ξϥƥࡦϼԤ
.B errno

.BR EINTR
ꤵ롣
.PP
ˤϥå塼ǡ¤ΤϰʲΤ褦
:
.IP
.B msg_lrpid
ˤϸƤӽФץΥץ ID ꤵ롣
.IP
.B msg_qnum
 1 롣
.IP
.B msg_rtime
ˤϸ߻郎ꤵ롣
.SH ֤
ԤˤϤɤδؿ
.B \-1
֤顼
.B errno
˻ؼ롣Ǥʤ
.B msgsnd

.B 0
֤
.B msgrvc
 ºݤ
.B mtext

ԡХȿ֤
.SH 顼
.B msgsnd
Ԥˤ
.B errno
˰ʲͤΤɤ줫ꤷ֤:
.TP 11
.B EAGAIN
.B msg_qbytes
塼θ³ĶƤ
.IR mgsflg 

.B IPC_NOWAIT
ꤵƤå뤳ȤǤʤä
.TP
.B EACCES
ƤӽФץå塼Ф񤭹ߵĤ
äƤʤ
.TP
.B EFAULT
.I msgp
ؤƤ륢ɥ쥹ǽǤʤ
.TP
.B EIDRM
å塼줿
.TP
.B EINTR
å塼ξ֤(sleep)Ƥˡ
ץ(catch)٤ʥȤä
.TP
.B EINVAL
.I msqid
ŬڤͤǤ뤫
.I mtype
ͤǤʤ
.I msgsz
Ŭڤ(0 ʲƥͤ
.BR MSGMAX 
礭)
.TP
.B ENOMEM
.BR msgbuf
˥ԡ뤿νʬʥ꤬ƥ¸ߤʤ
.PP
.B msgrcv
Ԥˤ
.B errno
˰ʲͤΤɤ줫ꤷ֤:
.TP 11
.B E2BIG
åΥƥȤĹ
.I msgsz
礭
.IR msgflg

.B MSG_NOERROR
ꤵƤʤä
.TP
.B EACCES
ƤӽФץå塼Ф
ɤ߹ߵĤäƤʤä
.TP
.B EFAULT
.I msgp
ؤƤ륢ɥ쥹ǽǤʤä
.TP
.B EIDRM
å뤿˥ץ(sleep)Ƥ֤ˡ
å塼줿
.TP
.B EINTR
å뤿˥ץ(sleep)Ƥ֤ˡ
ץͤ٤ʥ
.TP
.B EINVAL
.I msgqid

.I msgsz

.BR 0
꾮
.TP
.B ENOMSG
.I msgflg

.B IPC_NOWAIT
ꤵƤꡢ
å塼׵ᤵ줿Υå¸ߤʤä
.SH 
ʲ
.B msgsnd
ƥࡦ˱ƶ륷ƥ¤Ǥ:
.TP 11
.B MSGMAX
åΥƥȤκ祵:  4080 ХȤꤵƤ롣
.TP
.B MSGMNB
å塼ΥХȡΥǥեȤκ祵: ˰¸
ѡ桼
.B msgctl
ƥࡦǥå塼Υ
.B MSGMNB
礭ͤä뤳ȤǤ롣
.PP
ߤμǤϡƥΤΥåإåο
.RB ( MSGTQL )
ȡƥΤΥåסκХȿ
.RB ( MSGPOOL )
˸ͭξ¤Ϥʤ

.SH 
SVr4, SVID.
.SH Ϣ
.BR ipc (5),
.BR msgctl (2),
.BR msgget (2),
.BR msgrcv (2),
.BR msgsnd (2)