2 .\" Hey Emacs! This file is -*- nroff -*- source.
4 .\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
6 .\" Permission is granted to make and distribute verbatim copies of this
7 .\" manual provided the copyright notice and this permission notice are
8 .\" preserved on all copies.
10 .\" Permission is granted to copy and distribute modified versions of this
11 .\" manual under the conditions for verbatim copying, provided that the
12 .\" entire resulting derived work is distributed under the terms of a
13 .\" permission notice identical to this one.
15 .\" Since the Linux kernel and libraries are constantly changing, this
16 .\" manual page may be incorrect or out-of-date. The author(s) assume no
17 .\" responsibility for errors or omissions, or for damages resulting from
18 .\" the use of the information contained herein. The author(s) may not
19 .\" have taken the same level of care in the production of this manual,
20 .\" which is licensed free of charge, as they might when working
23 .\" Formatted or processed versions of this manual, if unaccompanied by
24 .\" the source, must acknowledge the copyright and authors of this work.
26 .\" Japanese Version Copyright (c) 2006 Akihiro MOTOKI all rights reserved.
27 .\" Translated 2006-07-31, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
28 .\" Updated 2010-04-18, Akihiro MOTOKI, LDP v3.24
29 .\" Updated 2010-10-27, Akihiro Motoki, LDP v3.29
31 .TH MQ_NOTIFY 3 2010-10-04 "Linux" "Linux Programmer's Manual"
33 mq_notify \- ¥á¥Ã¥»¡¼¥¸ÅþÃå»þ¤ËÄÌÃΤò¹Ô¤¦¤è¤¦ÅÐÏ¿¤¹¤ë
36 .B #include <mqueue.h>
38 .BI "int mq_notify(mqd_t " mqdes ", const struct sigevent *" notification );
41 \fI\-lrt\fP ¤Ç¥ê¥ó¥¯¤¹¤ë¡£
44 ¤ò»È¤¦¤È¡¢¥Ç¥£¥¹¥¯¥ê¥×¥¿
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47 ÈóƱ´ü¤ÎÄÌÃÎ (notification) ¤ÎÇÛÁ÷¤¬¹Ô¤ï¤ì¤ë¤è¤¦¤ËÅÐÏ¿¤·¤¿¤ê¡¢
48 ¤½¤Î²ò½ü¤ò¹Ô¤Ã¤¿¤ê¤Ç¤¤ë¡£
53 ¹½Â¤ÂΤؤΥݥ¤¥ó¥¿¤Ç¤¢¤ë¡£
54 ¤³¤Î¹½Â¤ÂΤÎÄêµÁ¤È°ìÈÌŪ¤Ê¾ÜºÙ¤Ë¤Ä¤¤¤Æ¤Ï
59 ¤¬ NULL ¤Ç¤Ê¤¤¥Ý¥¤¥ó¥¿¤Ç¤¢¤ì¤Ð¡¢
61 ¤Ï¥á¥Ã¥»¡¼¥¸ÄÌÃΤò¼õ¤±¼è¤ë¤è¤¦¤Ë¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤òÅÐÏ¿¤¹¤ë¡£
67 ¥Õ¥£¡¼¥ë¥É¤Ï¡¢¤É¤Î¤è¤¦¤ÊÄÌÃΤò¹Ô¤¦¤Î¤«¤ò»ØÄꤹ¤ë¡£
68 ¤³¤Î¥Õ¥£¡¼¥ë¥É¤Ï°Ê²¼¤ÎÃͤΤ¤¤º¤ì¤«¤ò»ý¤Ä¡£
71 ¡Ö¶õ¤Î (null)¡×¤ÎÄÌÃÎ: ¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤òÄÌÃΤΰ¸Àè¤È¤·¤ÆÅÐÏ¿¤¹¤ë¤¬¡¢
72 ¼ÂºÝ¤Ë¤Ï¥á¥Ã¥»¡¼¥¸¤¬ÅþÃ夷¤¿»þ¤ËÄÌÃΤÏÁ÷¤é¤ì¤Ê¤¤¡£
73 .\" When is SIGEV_NONE useful?
77 ¤Ç»ØÄꤵ¤ì¤¿¥·¥°¥Ê¥ë¤òÁ÷¤Ã¤Æ¡¢¥×¥í¥»¥¹¤ËÄÌÃΤ¹¤ë¡£
78 °ìÈÌŪ¤Ê¾ÜºÙ¤Ë¤Ä¤¤¤Æ¤Ï
87 .\" I don't know of other implementations that set
88 .\" si_pid and si_uid -- MTK
91 ¤Ë¤Ï¥á¥Ã¥»¡¼¥¸¤òÁ÷¿®¤·¤¿¥×¥í¥»¥¹¤Î PID ¤¬¡¢
93 ¤Ë¤ÏÁ÷¿®¥×¥í¥»¥¹¤Î¼Â¥æ¡¼¥¶ ID ¤¬ÀßÄꤵ¤ì¤ë¡£
96 ¥á¥Ã¥»¡¼¥¸¤ÎÇÛÁ÷»þ¤Ë¤Ï¡¢
97 .I sigev_notify_function
98 ¤¬¤¢¤¿¤«¤â¿·¤·¤¤¥¹¥ì¥Ã¥É¤Î³«»Ï´Ø¿ô¤Ç¤¢¤ë¤«¤Î¤è¤¦¤Ëµ¯Æ°¤µ¤ì¤ë¡£
103 °ì¤Ä¤Î¥á¥Ã¥»¡¼¥¸¥¥å¡¼¤«¤éÄÌÃΤò¼õ¿®¤¹¤ë¤è¤¦¤ËÅÐÏ¿¤Ç¤¤ë¥×¥í¥»¥¹¤Ï
107 ¤¬ NULL ¤Ç¡¢¤«¤Ä¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤¬¤³¤Î¥á¥Ã¥»¡¼¥¸¥¥å¡¼¤«¤é¤Î
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110 ÅÐÏ¿¤Ç¤¤ë¤è¤¦¤Ë¤Ê¤ë¡£
112 ¥á¥Ã¥»¡¼¥¸ÄÌÃΤϡ¢¤½¤ì¤Þ¤Ç¶õ¤Î¥¥å¡¼¤Ë¿·¤·¤¤¥á¥Ã¥»¡¼¥¸¤¬ÅþÃ夷¤¿
115 ¤¬¸Æ¤Ó½Ð¤µ¤ì¤¿»þ¤Ë¤½¤Î¥¥å¡¼¤¬¶õ¤Ç¤Ê¤¤¾ì¹ç¡¢
116 ¤½¤Î¥¥å¡¼¤¬¶õ¤Ë¤Ê¤ê¡¢¤½¤Î¸å¿·¤·¤¤¥á¥Ã¥»¡¼¥¸¤¬ÅþÃ夷¤¿»þ¤Ë
117 ½é¤á¤ÆÄÌÃΤ¬¹Ô¤ï¤ì¤ë¤³¤È¤Ë¤Ê¤ë¡£
119 ÊÌ¤Î¥×¥í¥»¥¹¤ä¥¹¥ì¥Ã¥É¤¬
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122 ¥á¥Ã¥»¡¼¥¸ÄÌÃΤÎÅÐÏ¿¤ÏÁ´¤Æ̵»ë¤µ¤ì¤ë¡£
125 ¤ò¸Æ¤Ó½Ð¤·¤Æ¤¤¤ë¥×¥í¥»¥¹¤ä¥¹¥ì¥Ã¥É¤ËÇÛÁ÷¤µ¤ì¡¢
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128 ÄÌÃΤϰìÅÙ¤À¤±¹Ô¤ï¤ì¤ë¡£ÄÌÃΤ¬Á÷¤é¤ì¤¿¸å¤Ï¡¢ÄÌÃÎÍ×µá¤ÎÅÐÏ¿¤Ïºï½ü¤µ¤ì¡¢
129 ÊÌ¤Î¥×¥í¥»¥¹¤¬¥á¥Ã¥»¡¼¥¸ÄÌÃΤò¼õ¿®¤¹¤ë¤è¤¦¤ËÅÐÏ¿¤Ç¤¤ë¤è¤¦¤Ë¤Ê¤ë¡£
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134 ¤òºÆÅٸƤӽФ¹¤Î¤Ï¡¢Æɤ߽Ф·¤Æ¤¤¤Ê¤¤¥á¥Ã¥»¡¼¥¸¤òÁ´ÉôÆɤ߽Ф·¤Æ
135 ¥¥å¡¼¤¬¶õ¤Ë¤Ê¤ëÁ°¤Ë¤¹¤Ù¤¤Ç¤¢¤ë
136 (¥¥å¡¼¤«¤é¤Î¥á¥Ã¥»¡¼¥¸Æɤ߽Ф·¤ò¥¥å¡¼¤¬¶õ¤Ë¤Ê¤Ã¤¿»þ¤Ë
137 Ää»ß (block) ¤»¤º¤Ë¹Ô¤¦¤Ë¤Ï¡¢¥¥å¡¼¤òÈóÄä»ß¥â¡¼¥É (non-blocking mode)
138 ¤ËÀßÄꤷ¤Æ¤ª¤¯¤È¤è¤¤)¡£
142 ¤Ï 0 ¤òÊÖ¤¹¡£¥¨¥é¡¼¤Î¾ì¹ç¡¢\-1 ¤òÊÖ¤·¡¢
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156 .I sevp\->sigev_notify
157 ¤¬µö²Ä¤µ¤ì¤¿ÃͤΤ¤¤º¤ì¤Ç¤â¤Ê¤¤¡£¤â¤·¤¯¤Ï
158 .I sevp\->sigev_notify
162 .I sevp\->sigev_signo
163 ¤¬Í¸ú¤Ê¥·¥°¥Ê¥ëÈÖ¹æ¤Ç¤Ï¤Ê¤¤¡£
166 ɬÍפʥá¥â¥ê¤¬¤Ê¤«¤Ã¤¿¡£
170 ¤¬ NULL ¤Ç¡¢¸Æ¤Ó½Ð¤·¸µ¤Î¥×¥í¥»¥¹¤¬¥¥å¡¼
172 ¤Ë´Ø¤¹¤ëÄÌÃΤò¼õ¿®¤¹¤ë¤è¤¦¤ËÅÐÏ¿¤µ¤ì¤Æ¤¤¤Ê¤¤¾ì¹ç¡¢¥¨¥é¡¼
174 ¤òÀ¸À®¤¹¤ë¤è¤¦¤Ê¼ÂÁõ¤ò¹Ô¤Ã¤Æ¤â¡Ö¤è¤¤¡×¤³¤È¤Ë¤Ê¤Ã¤Æ¤¤¤ë¡£
175 .\" Linux ¤Î¼ÂÁõ¤Ç¤Ï EINVAL ¤ÏÀ¸À®¤µ¤ì¤Ê¤¤
180 ¥³¥Þ¥ó¥É¥é¥¤¥ó°ú¤¿ô¤Ç»ØÄꤵ¤ì¤¿Ì¾Á°¤Î¥á¥Ã¥»¡¼¥¸¥¥å¡¼¤Ø¤Î
181 ÄÌÃÎÍ×µá¤òÅÐÏ¿¤·¡¢ÄÌÃΤϥ¹¥ì¥Ã¥É¤ÎºîÀ®¤Ë¤è¤Ã¤Æ¹Ô¤ï¤ì¤ë¡£
182 ¤½¤Î¥¹¥ì¥Ã¥É¤Ï¡¢¤½¤Î¥¥å¡¼¤«¤é¥á¥Ã¥»¡¼¥¸¤ò°ì¤ÄÆɤ߽Ф·¤Æ¤«¤é¡¢
183 ¥×¥í¥»¥¹¤ò½ªÎ»¤¹¤ë´Ø¿ô¤ò¼Â¹Ô¤¹¤ë¡£
192 #define handle_error(msg) \\
193 do { perror(msg); exit(EXIT_FAILURE); } while (0)
195 static void /* ¥¹¥ì¥Ã¥É³«»Ï´Ø¿ô */
196 tfunc(union sigval sv)
201 mqd_t mqdes = *((mqd_t *) sv.sival_ptr);
203 /* ºÇÂç¥á¥Ã¥»¡¼¥¸¥µ¥¤¥º¤ò·èÄꤷ¡¢
204 ¥á¥Ã¥»¡¼¥¸¼õ¿®ÍѤΥХåե¡¤ò³ÎÊݤ¹¤ë */
206 if (mq_getattr(mqdes, &attr) == \-1)
207 handle_error("mq_getattr");
208 buf = malloc(attr.mq_msgsize);
210 handle_error("malloc");
212 nr = mq_receive(mqdes, buf, attr.mq_msgsize, NULL);
214 handle_error("mq_receive");
216 printf("Read %ld bytes from MQ\\n", (long) nr);
218 exit(EXIT_SUCCESS); /* ¥×¥í¥»¥¹¤ò½ªÎ»¤¹¤ë */
222 main(int argc, char *argv[])
228 fprintf(stderr, "Usage: %s <mq-name>\\n", argv[0]);
232 mqdes = mq_open(argv[1], O_RDONLY);
233 if (mqdes == (mqd_t) \-1)
234 handle_error("mq_open");
236 sev.sigev_notify = SIGEV_THREAD;
237 sev.sigev_notify_function = tfunc;
238 sev.sigev_notify_attributes = NULL;
239 sev.sigev_value.sival_ptr = &mqdes; /* ¥¹¥ì¥Ã¥É´Ø¿ô¤ËÅϤ¹°ú¤¿ô */
240 if (mq_notify(mqdes, &sev) == \-1)
241 handle_error("mq_notify");
243 pause(); /* ¥×¥í¥»¥¹¤Ï¥¹¥ì¥Ã¥É´Ø¿ô¤Ë¤è¤ê½ªÎ»¤µ¤ì¤ë */