2 * Copyright (c) 2009, Stathis Kamperis
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34 #include <string.h> /* memset() */
36 #define MQNAME "/t_mq_send"
44 /* Invalid message queue descriptor. */
45 rv = mq_send(-1, "", 0, 0);
46 assert (rv == -1 && errno == EBADF);
49 * Priority is out of range 0...{MQ_PRIO_MAX}-1
50 * Mind that count starts from 0.
53 #ifdef _SC_MQ_PRIO_MAX
54 maxprio = sysconf(_SC_MQ_PRIO_MAX);
58 * Use some ridiculously high value.
59 * Linux claims that supports 32768 priorities!
63 md = mq_open(MQNAME, O_CREAT | O_EXCL | O_WRONLY, 0700, NULL);
66 rv = mq_send(md, "foo", sizeof("foo"), maxprio);
67 assert(rv == -1 && errno == EINVAL);
73 * Message size is larger than maximum allowed message size.
74 * The latter is implementation defined. In NetBSD happens to
75 * be 16*1024 as defined in sys/mqueue.h and kern/sys_mqueue.c.
76 * We use a "sufficiently" large value to cover other
77 * implemenetations as well.
79 md = mq_open(MQNAME, O_CREAT | O_EXCL | O_WRONLY, 0700, NULL);
83 rv = mq_send(md, p, 32768, /* priority */ 0);
84 assert(rv == -1 && errno == EMSGSIZE);
89 /* Same as previous but use a non-default maximum message size. */
90 memset(&attr, 0, sizeof(attr));
91 attr.mq_maxmsg = 1; /* Maximum number of messages. */
92 attr.mq_msgsize = 50; /* Maximum message size. */
93 md = mq_open(MQNAME, O_CREAT | O_EXCL | O_WRONLY, 0700, &attr);
96 p = malloc(2 * attr.mq_msgsize);
98 memset(p, 0xff, 2 * attr.mq_msgsize); /* Make sure we don't terminate prematurely */
100 rv = mq_send(md, p, 2 * attr.mq_msgsize, /* priority */ 0);
101 assert(rv == -1 && errno == EMSGSIZE);
110 return (EXIT_SUCCESS);