spock.c

// From: http://beej.us/guide/bgipc/output/html/multipage/mq.html
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>

struct my_msgbuf {
long mtype;
char mtext[200];
};

int main(void)
{
struct my_msgbuf buf;
int msqid;
key_t key;

if ((key = ftok("kirk.c", 'B')) == -1) { /* same key as kirk.c */
perror("ftok");
exit(1);
}

if ((msqid = msgget(key, 0644)) == -1) { /* connect to the queue */
perror("msgget");
exit(1);
}

printf("spock: ready to receive messages, captain.\n");

for(;;) { /* Spock never quits! */
if (msgrcv(msqid, &buf, sizeof(buf.mtext), 0, 0) == -1) {
perror("msgrcv");
exit(1);
}
printf("spock: \"%s\"\n", buf.mtext);
}

return 0;
}