Initial import of t_shmat.
[pcca-tests.git] / mqueue.h / t_mq_notify_simple.c
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1/*
2 * Copyright (c) 2009, Stathis Kamperis
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
17 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
18 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
24 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
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28#include <assert.h>
29#include <mqueue.h>
30#include <signal.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <unistd.h> /* for sleep() */
34
d58890c5 35#define MQNAME "/t_mq_notify_simple"
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36
37int notified = 0; /* Whether we were notified or not. */
38
39/* Function prototypes. */
40static void myhandler(int, siginfo_t *, void *);
41
42int main(void)
43{
44 mqd_t md;
45
46 /* Create a new message queue. */
47 md = mq_open(MQNAME, O_CREAT | O_EXCL | O_RDWR, 0777, NULL);
48 assert(md != (mqd_t)-1);
49
50 /*
51 * At this point the message queue is empty.
d58890c5 52 * We register ourselves for notification, upon the arrival of a
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53 * message.
54 */
55 struct sigevent sigev;
56
57 sigev.sigev_signo = SIGUSR1;
58 sigev.sigev_notify = SIGEV_SIGNAL;
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59 /* This is a temporary (famous last words) hack for DragonFly. */
60#ifndef __DragonFly__
61 sigev.sigev_value.sival_int = (int)md;
62#endif
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63
64 assert(mq_notify(md, &sigev) != -1);
65
66 /* We install a signal handler to catch SIGUSR1. */
67 struct sigaction sa;
68
69 sa.sa_sigaction = myhandler;
70 sa.sa_flags = SA_SIGINFO;
71
72 assert(sigaction(SIGUSR1, &sa, NULL) != -1);
73
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74 /* A little bit paranoid. */
75 assert(notified == 0);
76
af3f41db 77 /*
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78 * We send a message to the queue so that the transition
79 * empty->non empty takes place and the signal is raised.
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80 */
81 assert(mq_send(md, "foo", sizeof("foo"), 0) != -1);
82
83 /*
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84 * Make sure we were notified, but first take a nap so that the
85 * implementation has enough time at its disposal.
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86 */
87 sleep(1);
88 assert(notified == 1);
89 notified = 0;
90
91 /* Disassociate with message queue. */
92 assert(mq_close(md) != -1);
93
94 /* Remove the message queue from the system. */
95 assert(mq_unlink(MQNAME) != -1);
96
70c4500a 97 /* A little bit of paranoia again. We don't want spurious wakeups. */
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98 assert(notified == 0);
99
100 printf("passed\n");
101
102 return (EXIT_SUCCESS);
103}
104
105static void
106myhandler(int signo, siginfo_t *info, void *context)
107{
108 notified = 1;
109}