/*
 * Copyright (c) 2003, Intel Corporation. All rights reserved.
 * Created by:  majid.awad 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.
 */

/*
 * errno return EAGAIN: The semaphore can't be immediately locked by 
 * sem_trywait when its already locked.
 */


#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <semaphore.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "posixtest.h"


#define TEST "5-1"
#define FUNCTION "sem_trywait"
#define ERROR_PREFIX "unexpected errno: " FUNCTION " " TEST ": "



int main() {
	sem_t *mysemp;
	char semname[20];

	sprintf(semname, "/" FUNCTION "_" TEST "_%d", getpid());

	/* Initial value of Semaphore is 0 Locked */
	mysemp = sem_open(semname, O_CREAT, 0777, 0);
	if( mysemp == SEM_FAILED || mysemp == NULL ) {
		perror(ERROR_PREFIX "sem_open");
		return PTS_UNRESOLVED;
	}

	/* Lock Semaphore by sem_trywait*/
	if (( sem_trywait(mysemp) == -1) && ( errno == EAGAIN) ) {
		puts("TEST PASSED");
		sem_close(mysemp);
		sem_unlink(semname);
		return PTS_PASS;
	} else {
		puts("TEST FAILED: ERROR IS NOT EAGAIN");
		return PTS_FAIL;
	}
}


