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4 .\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
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26 .\" Japanese Version Copyright (c) 2006 Akihiro MOTOKI all rights reserved.
27 .\" Translated 2006-04-23, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
28 .\" Updated 2008-11-09, Akihiro MOTOKI, LDP v3.13
30 .TH MQ_SEND 3 2010-09-20 "Linux" "Linux Programmer's Manual"
33 .\"O mq_send, mq_timedsend \- send a message to a message queue
34 mq_send, mq_timedsend \- メッセージキューにメッセージを送信する
38 .B #include <mqueue.h>
40 .BI "int mq_send(mqd_t " mqdes ", const char *" msg_ptr ,
41 .BI " size_t " msg_len ", unsigned " msg_prio );
44 .B #include <mqueue.h>
46 .BI "int mq_timedsend(mqd_t " mqdes ", const char *" msg_ptr ,
47 .BI " size_t " msg_len ", unsigned " msg_prio ,
48 .BI " const struct timespec *" abs_timeout );
51 .\"O Link with \fI\-lrt\fP.
56 .\"O Feature Test Macro Requirements for glibc (see
57 .\"O .BR feature_test_macros (7)):
59 .RB ( feature_test_macros (7)
65 _XOPEN_SOURCE\ >=\ 600 || _POSIX_C_SOURCE\ >=\ 200112L
71 .\"O adds the message pointed to by
73 .\"O to the message queue referred to by the descriptor
77 .\"O argument specifies the length of the message pointed to by
79 .\"O this length must be less than or equal to the queue's
82 .\"O Zero-length messages are allowed.
92 が指すメッセージの長さを示す。この長さはキューの
99 .\"O argument is a nonnegative integer that specifies the priority
100 .\"O of this message.
101 .\"O Messages are placed on the queue in decreasing order of priority,
102 .\"O with newer messages of the same priority being placed after
103 .\"O older messages with the same priority.
105 引き数は、メッセージの優先度を指定する負でない整数である。
106 メッセージは優先度の降順でキューに格納され、同じ優先度の新しいメッセージは
107 同じ優先度の古いメッセージの後ろに格納される。
109 .\"O If the message queue is already full
110 .\"O (i.e., the number of messages on the queue equals the queue's
112 .\"O attribute), then, by default,
114 .\"O blocks until sufficient space becomes available to allow the message
115 .\"O to be queued, or until the call is interrupted by a signal handler.
118 .\"O flag is enabled for the message queue description,
119 .\"O then the call instead fails immediately with the error
122 (すなわち、キューに入っているメッセージ数がキューの
126 は、メッセージをキューイングするのに十分な空間ができるか、
127 関数呼び出しがシグナルハンドラにより中断されるまで、停止 (block) する。
128 メッセージキュー記述 (message queue description) で
136 .\"O .BR mq_timedsend ()
137 .\"O behaves just like
139 .\"O except that if the queue is full and the
141 .\"O flag is not enabled for the message queue description, then
143 .\"O points to a structure which specifies a ceiling on the time for which
144 .\"O the call will block.
145 .\"O This ceiling is an absolute timeout in seconds and nanoseconds
146 .\"O since the Epoch, 1970-01-01 00:00:00 +0000 (UTC), and it is
147 .\"O specified in the following structure:
152 メッセージキューが一杯で、メッセージキュー記述で
154 フラグが有効になっていない場合に、この呼び出しが停止する時間の上限を
156 が指す構造体で指定する点が異なる。この上限は、タイムアウトの時刻を
157 時刻紀元 (Epoch; 1970-01-01 00:00:00 +0000 (UTC)) からの経過時間
158 (秒とナノ秒の組) で指定する。タイムアウト時刻は以下の構造体で指定する:
163 .\"O time_t tv_sec; /* seconds */
164 .\"O long tv_nsec; /* nanoseconds */
165 time_t tv_sec; /* 秒 */
166 long tv_nsec; /* ナノ秒 */
171 .\"O If the message queue is full,
172 .\"O and the timeout has already expired by the time of the call,
173 .\"O .BR mq_timedsend ()
174 .\"O returns immediately.
175 メッセージキューが一杯で、関数呼び出し時にすでにタイムアウト時刻が
179 .\"O .SH RETURN VALUE
184 .\"O .BR mq_timedsend ()
185 .\"O return zero; on error, \-1 is returned, with
187 .\"O set to indicate the error.
200 .\"O The queue was full, and the
202 .\"O flag was set for the message queue description referred to by
211 .\"O The descriptor specified in
218 .\"O The call was interrupted by a signal handler; see
220 関数呼び出しがシグナルハンドラにより中断された。
225 .\"O The call would have blocked, and
227 .\"O was invalid, either because
229 .\"O was less than zero, or because
231 .\"O was less than zero or greater than 1000 million.
240 が 0 未満か 1,000,000,000 より大きい、ということである。
244 .\"O was greater than the
246 .\"O attribute of the message queue.
253 .\"O The call timed out before a message could be transferred.
254 メッセージが転送される前に関数呼び出しがタイムアウトした。
255 .\"O .SH CONFORMING TO
261 .\"O .BR mq_timedsend ()
262 .\"O is a system call, and
264 .\"O is a library function layered on top of that system call.