/*
 * Copyright (c) 2002, 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 if O_NONBLOCK is set and the message queue is full, mq_send()
 * will just return an error message and the message will not be queued.
 *
 * Test by sending messages with increasing priority number until a failure
 * is received.  Then test that the message just sent (highest priority) is
 * not the one received.
 *
 * 3/13/03 - Added fix from Gregoire Pichon for specifying an attr
 *           with a mq_maxmsg >= BUFFER.
 *
 */

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

#define NAMESIZE 50
#define MESSAGESIZE 50
#define MSGSTR "0123456789"
#define BUFFER 40
#define MAXMSG 10 	// send should end after MAXMSG

int main()
{
        char qname[NAMESIZE], msgrcd[BUFFER];
        char msgptr[MESSAGESIZE];
        mqd_t queue;
	struct mq_attr attr;
	int unresolved=0, failure=0, spri=1, i, maxreached=0;
	unsigned pri;

        sprintf(qname, "/mq_send_7-1_%d", getpid());

	attr.mq_msgsize = BUFFER;
	attr.mq_maxmsg = MAXMSG;
        queue = mq_open(qname, O_CREAT | O_RDWR | O_NONBLOCK, 
			S_IRUSR | S_IWUSR, &attr);
        if (queue == (mqd_t)-1) {
                perror("mq_open() did not return success");
                return PTS_UNRESOLVED;
        }

	for (i=0; i<MQ_PRIO_MAX; i++) { // assuming MAXMSG < MQ_PRIO_MAX
		sprintf(msgptr, "message %d", i);
        	if (mq_send(queue, msgptr, strlen(msgptr), spri++) == -1) {
			maxreached=1;
			if (errno != EAGAIN) {
				printf("mq_send() did not fail on EAGAIN\n");
				failure=1;
			}
			break;
        	}
	}

        if (mq_receive(queue, msgrcd, BUFFER, &pri) == -1) {
		perror("mq_receive() returned failure");
		unresolved=1;
	} else {
		if ((strcmp(msgptr, msgrcd) == 0) && (maxreached!=0)) {
			printf("Error: Received message that caused EAGAIN\n");
			failure = 1;
		}
	}

        if (mq_close(queue) != 0) {
		perror("mq_close() did not return success");
		unresolved=1;
        }

        if (mq_unlink(qname) != 0) {
		perror("mq_unlink() did not return success");
		unresolved=1;
        }

	if (maxreached==0) {
		printf("Test inconclusive:  Couldn't fill message queue\n");
		return PTS_UNRESOLVED;
	}
	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;
}

