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'\" t
.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
.\"
.\" 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.\" manual page may be incorrect or out-of-date.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.
.\"
.\" Japanese Version Copyright (c) 2006 Akihiro MOTOKI all rights reserved.
.\" Translated 2006-04-23, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2008-11-09, Akihiro MOTOKI, LDP v3.13
.\"
.TH MQ_GETATTR 3 2008-09-29 "Linux" "Linux Programmer's Manual"
.SH ̾
mq_getattr, mq_setattr \- å塼°/
.SH
.nf
.B #include <mqueue.h>
.sp
.BI "mqd_t mq_getattr(mqd_t " mqdes ", struct mq_attr *" attr );
.BI "mqd_t mq_setattr(mqd_t " mqdes ", struct mq_attr *" newattr ","
.BI " struct mq_attr *" oldattr );
.fi
.sp
\fI\-lrt\fP ǥ롣
.SH
.BR mq_getattr ()
.BR mq_setattr ()
ϡһ
.I mqdes
ǻȤå塼°μѹ줾Ԥ
.BR mq_getattr ()
ϡ
.I attr
ؤХåե
.I mq_attr
¤ΤǼ֤ι¤ΤϰʲΤ褦Ƥ:
.in +4n
.nf
struct mq_attr {
long mq_flags; /* ե饰: 0 O_NONBLOCK */
long mq_maxmsg; /* 塼κå */
long mq_msgsize; /* å (Хñ) */
long mq_curmsgs; /* 塼˸äƤå */
};
.fi
.in
.PP
.I mq_flags
եɤˤϡץå塼 (open message queue
description) ˴ϢդƤե饰Ǽ롣
Υեɤ
.BR mq_open (3)
ǥ塼ݤ˽롣
Υեɤ˸ե饰
.B O_NONBLOCK
Ǥ롣
.I mq_maxmsg
.I mq_msgsize
եɤ
.BR mq_open (3)
ǥå塼ݤ˥åȤ롣
.I mq_maxmsg
եɤϡ
.BR mq_send (3)
Ȥäƥ塼뤳ȤǤåξ¤Ǥ롣
.I mq_msgsize
եɤϡ塼뤳ȤǤå
¥Ǥ롣
ΥեɤϤɤ 0 礭ͤǤʤФʤʤ
ΥեɤǤͤξ¤
.I /proc
եˤޤ롣
.I /proc
եξܺ٤
.BR mq_open (3)
Ƥ롣
.I mq_curmsgs
եɤϥ塼˸߳ǼƤå֤
.BR mq_setattr ()
ϡ
.I newattr
ؤ
.I mq_attr
¤ΤͿ줿Ȥäơå塼°ꤹ롣
ѹ뤳ȤǤ°ϡ
.I mq_flags
.B O_NONBLOCK
ե饰Ǥ롣
.I newattr
¾Υեɤ̵뤵롣
.I oldattr
եɤ NULL ʳξ硢
.BR mq_getattr ()
֤ΤƱǼ
.I mq_attr
¤Τ
.I oldattr
ؤХåե֤
.SH ֤
ȡ
.I mq_getattr ()
.I mq_setattr ()
0 ֤顼ξ硢\-1 ֤
.I errno
˥顼ͤꤹ롣
.SH 顼
.TP
.B EBADF
.I mqdes
ǻꤵ줿һҤǤ롣
.TP
.B EINVAL
.I newattr\->mq_flags
.B O_NONBLOCK
ʳΥӥåȤåȤƤ
.SH
POSIX.1-2001.
.SH
Linux Ǥϡ
.BR mq_getattr ()
.BR mq_setattr ()
ϥ饤֥ؿǤꡢ
.BR mq_getsetattr (2)
ƥॳѤƼƤ롣
.SH Ϣ
.BR mq_close (3),
.BR mq_notify (3),
.BR mq_open (3),
.BR mq_receive (3),
.BR mq_send (3),
.BR mq_unlink (3),
.BR mq_overview (7)
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