Initial import of t_shmat.
[pcca-tests.git] / mqueue.h / t_mq_parent_child.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
97cb13ce 28#include <assert.h>
062bbe7c 29#include <fcntl.h>
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30#include <mqueue.h>
31#include <stdio.h>
dff7c724 32#include <string.h>
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33#include <stdlib.h>
34#include <unistd.h> /* fork() */
232ab19b 35#include <sys/wait.h>
97cb13ce 36
17621d19 37#define MQNAME "/tmqpc"
97cb13ce 38
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39mqd_t md;
40
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41static void diep(const char *s);
42
43int main(void)
44{
ff954369 45 const char msg[] = "Parent says hello";
97cb13ce 46 int rv;
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47 pid_t pid;
48
03ff01d7 49 /* Create a message queue for write only with default parameters. */
b1b68f2f 50 md = mq_open(MQNAME, O_CREAT | O_EXCL | O_WRONLY, 0700, NULL);
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51 if (md == -1)
52 diep("mq_open");
53
03ff01d7 54 /* Send message. */
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55 rv = mq_send(md, msg, sizeof(msg), /* priority */ 0);
56 if (rv == -1)
57 diep("mq_send");
58
03ff01d7 59 /* Disassociate with message queue. */
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60 rv = mq_close(md);
61 if (rv == -1)
62 diep("mq_close");
63
03ff01d7 64 /* Fork and have child read the message from parent. */
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65 pid = fork();
66 if (pid == -1) {
67 diep("fork");
68 } else if (pid == 0) {
03ff01d7 69 /* We are inside the child. */
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70 md = mq_open(MQNAME, O_RDONLY);
71 if (md == -1)
72 diep("child: mq_open");
73
03ff01d7 74 char msg_recvd[8192]; /* Implementation defined. */
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75 rv = mq_receive(md, msg_recvd, sizeof(msg_recvd), NULL);
76 if (rv == -1)
77 diep("child: mq_receive");
78
dff7c724 79 assert(strcmp(msg_recvd, msg) == 0);
97cb13ce 80
03ff01d7 81 /* Disassociate with message queue. */
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82 rv = mq_close(md);
83 if (rv == -1)
84 diep("child: mq_close");
85
03ff01d7 86 /* Remove the message queue from the system. */
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87 rv = mq_unlink(MQNAME);
88 if (rv == -1)
89 diep("mq_unlink");
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90
91 printf("passed\n");
97cb13ce 92 } else {
03ff01d7 93 /* We are inside the parent. */
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94 int status;
95 wait(&status);
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96 }
97
290718e9 98 return EXIT_SUCCESS;
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99}
100
101void diep(const char *s)
102{
103 perror(s);
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104
105 /*
106 * Message queues' name & resources are persistent, i.e., they live
107 * even after the process dies. That's why, disassociate and destroy
108 * the queue on failure, or else we might end up with zombie queues and
109 * hit the limit of max open queues.
110 * Also, we don't care about the return value of the following calls.
111 */
112 mq_close(md);
113 mq_unlink(MQNAME);
114
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115 exit(EXIT_FAILURE);
116}