Initial import of t_shmat.
[pcca-tests.git] / mqueue.h / t_mq_send3.c
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1/*
2 * Copyright (c) 2010, 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
86afc136 28#include <assert.h>
29#include <mqueue.h>
86afc136 30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h> /* memset() */
86afc136 33#include <sys/types.h>
34#include <sys/wait.h>
35#include <unistd.h>
36
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37#define MQNAME "/t_mq_send3"
38#define NMESSAGES 10
86afc136 39
86afc136 40int
41main(void)
42{
43 /* Create message queue with maxmsg `10'. */
44 struct mq_attr attr;
45
46 memset(&attr, 0, sizeof(attr));
47 attr.mq_maxmsg = NMESSAGES; /* Maximum number of messages. */
48 attr.mq_msgsize = 1024; /* Maximum message size. */
49
50 /*
51 * We intentionally omit the O_NONBLOCK flag as we want our queue to
52 * operate on blocking mode.
53 */
54 mqd_t md;
55
131a7cec 56 md = mq_open(MQNAME, O_CREAT | O_EXCL | O_RDWR, 700, &attr);
86afc136 57 assert(md != (mqd_t)-1);
58
59 /*
60 * A little bit of paranoia.
61 * Make sure that the maximum number of messages is equal to what we
62 * set it. I.e., it didn't round up under our feet, which would defeat
63 * the whole purpose of the test.
64 */
65 memset(&attr, 0, sizeof(attr));
66
67 assert(mq_getattr(md, &attr) != -1);
68 assert(attr.mq_maxmsg == NMESSAGES);
69
70 pid_t pid = fork();
71 assert(pid != -1);
72
73 if (pid == 0) {
86afc136 74 /*
39a3e021 75 * We are inside the child.
76 *
86afc136 77 * Send one more message than the maximum messages the queue
78 * can hold. In the last message, the mq_send() call will block.
79 */
80 size_t i;
846b5cff 81
86afc136 82 for (i = 0; i < NMESSAGES + 1; i++) {
83 assert(mq_send(md, "foo", sizeof("foo"),
8e0b532e 84 /* priority */ i + 1) != -1);
86afc136 85 }
86 } else {
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87 /*
88 * We are inside the parent.
89 *
90 * Sleep a bit so that child takes its time to block on
91 * mq_send().
92 */
93 assert(sleep(2) == 0);
86afc136 94
95 /*
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96 * Start draining messages from the queue.
97 * Messages are sent with increasing priority, so the last sent
98 * is the first to be delivered.
86afc136 99 */
100 char buf[1024];
86afc136 101 unsigned int prio;
102
8e0b532e 103 /*
39a3e021 104 * Deliver 10th message --
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105 * this means that the last mq_send() call blocked.
106 */
107 assert(mq_receive(md, buf, sizeof(buf), &prio) != -1);
108 assert(prio == NMESSAGES);
86afc136 109
8e0b532e 110 assert(sleep(1) == 0);
86afc136 111
112 /*
39a3e021 113 * Deliver 11th message --
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114 * this means that the last mq_send() call unblocked as it ought
115 * to.
86afc136 116 */
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117 assert(mq_receive(md, buf, sizeof(buf), &prio) != -1);
118 assert(prio == NMESSAGES + 1);
86afc136 119
120 /* We are done -- cleanup */
121 assert(mq_close(md) != -1);
122 assert(mq_unlink(MQNAME) != -1);
846b5cff 123
86afc136 124 printf("passed\n");
125
126 return (EXIT_SUCCESS);
127 }
128
8e0b532e 129 /* Only reached by the child. */
86afc136 130 return (EXIT_SUCCESS);
131}