testcases/open_posix_testsuite/mq_open/mq_open01.26-1.c

/*
 * Copyright (c) 2003, Intel Corporation. All rights reserved.
 * Created by:  julie.n.fleischer REMOVE-THIS AT intel DOT com
 * This file is licensed under the GPL license.  For the full content
 * of this license, see the COPYING file at the top level of this
 * source tree.
 */

/*
 * Test that mq_open() fails with EMFILE if there are too many message
 * queue descriptors in use by the process calling mq_open.
 *
 * Test by calling mq_open() MQ_OPEN_MAX+1 times.  If it fails, assume
 * it was because there were too many message queue descriptors open
 * and check that errno == EMFILE.  
 */

#include <stdio.h>
#include <mqueue.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <limits.h>
#include "posixtest.h"

#define NAMESIZE 50

int main()
{
#ifdef MQ_OPEN_MAX
        char qname[NAMESIZE];
        mqd_t queue[MQ_OPEN_MAX+1];
	int i, unresolved=0, failure=0;

	for (i=0; i<MQ_OPEN_MAX;i++) {
        	sprintf(qname, "/msgqueue%d_%d", i, getpid());

        	queue[i] = mq_open(qname, O_CREAT |O_RDWR, 
						S_IRUSR | S_IWUSR, NULL);
        	if (queue[i] == (mqd_t)-1) {
			printf("mq_open() failed before expected\n");
			unresolved=1;
			break;
        	}
	}

	queue[MQ_OPEN_MAX] = mq_open(qname, O_CREAT |O_RDWR,
			S_IRUSR | S_IWUSR, NULL);
	if (queue[MQ_OPEN_MAX] != (mqd_t)-1) {
		printf("mq_open() did not fail on > MQ_OPEN_MAX queues\n");
		failure=1;
	}

	if (errno != EMFILE) {
		printf("errno != EMFILE on > MQ_OPEN_MAX queues\n");
		failure=1;
	}

	for (i=0; i<=MQ_OPEN_MAX;i++) {
        	mq_close(queue[i]);
	}

	for (i=0; i<=MQ_OPEN_MAX;i++) {
        	sprintf(qname, "/msgqueue%d_%d", i, getpid());
        	mq_unlink(qname);
	}

	if (failure==1) {
		printf("Test FAILED\n");
		return PTS_FAIL;
	}

	if (unresolved==1) {
		printf("Test UNRESOLVED\n");
		return PTS_UNRESOLVED;
	}

        printf("Test PASSED\n");
        return PTS_PASS;
#else
	printf("MQ_OPEN_MAX not defined as expected\n");
	return PTS_UNRESOLVED;
#endif
}