88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
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/* This file is part of the sample code and exercises
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* used by the class "Advanced Programming in the UNIX
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* Environment" taught by Jan Schaumann
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* <jschauma@netmeister.org> at Stevens Institute of
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* Technology.
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*
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* This file is in the public domain.
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*
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* You don't have to, but if you feel like
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* acknowledging where you got this code, you may
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* reference me by name, email address, or point
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* people to the course website:
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* https://stevens.netmeister.org/631/
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*/
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/* This program is used together with 'mqrecv' program
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* to illustrate the use of POSIX message queues; see
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* mq(3) for details.
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*
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* Remember to link with '-lrt'.
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*
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* Note: you need to run the 'mqrecv' program first,
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* as it create the message queue.
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*/
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#include <err.h>
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#include <errno.h>
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#include <mqueue.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define MQ_PATH "/sandwiches"
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#define MQ_DEFAULT_PRIORITY 0
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#define MQ_IMPORTANT 1
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int
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main(int argc, char **argv) {
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mqd_t mq;
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int ch, wait;
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wait = 0;
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setprogname(argv[0]);
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while ((ch = getopt(argc, argv, "w")) != -1) {
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switch (ch) {
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case 'w':
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wait = 1;
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break;
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default:
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(void)fprintf(stderr, "Usage: %s [-w] message\n",
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getprogname());
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exit(EXIT_FAILURE);
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if ((mq = mq_open(MQ_PATH, O_WRONLY)) == (mqd_t)-1) {
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err(EXIT_FAILURE, "mq_open");
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/* NOTREACHED */
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}
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for (int i = 0; i < argc; i++) {
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if (mq_send(mq, argv[i], strlen(argv[i]), MQ_DEFAULT_PRIORITY) == -1) {
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(void)fprintf(stderr, "%s: Unable to send message %d: %s\n",
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getprogname(), i, strerror(errno));
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}
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if (wait) {
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sleep(1);
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}
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}
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if (mq_send(mq, "TUNA", strlen("TUNA"), MQ_IMPORTANT) == -1) {
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err(EXIT_FAILURE, "mq_send");
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/* NOTREACHED */
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}
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if (mq_close(mq) == -1) {
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err(EXIT_FAILURE, "mq_close");
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/* NOTREACHED */
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}
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return EXIT_SUCCESS;
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}
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