Delete existing message queue in C.

queue-delete.c

// Deletes message queue in C.
// For educational purposes only.
// Author: Vaclav Bohac

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>


int main ( void )
{
	int key, mask, msgid;

	key = getuid();
	mask = 0666;
	msgid = msgget(key, mask);	

	if (msgid == -1) {
		printf("Message queue does not exist.\n");
		exit(EXIT_SUCCESS);
	}

	if (msgctl(msgid, IPC_RMID, NULL) == -1) {
		fprintf(stderr, "Message queue could not be deleted.\n");
		exit(EXIT_FAILURE);
	}

	printf("Message queue was deleted.\n");

	return EXIT_SUCCESS;
}