xref: /external/ltp/testcases/open_posix_testsuite/conformance/interfaces/shm_unlink/5-1.c

/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 * Test that the reuse of the name subsequently causes shm_open() to
 * create a new shared memory object if O_CREAT is set even if the object
 * continues to exist after the last shm_unlink(),
 */

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

#define SHM_NAME "posixtest_5-1"

int main() {
	int fd;

	fd = shm_open(SHM_NAME, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
	if (fd == -1) {
		perror("An error occurs when calling shm_open()");
		return PTS_UNRESOLVED;
	}

	if (shm_unlink(SHM_NAME) != 0) {
		perror("An error occurs when calling shm_unlink()");
		return PTS_UNRESOLVED;
	}

	fd = shm_open(SHM_NAME, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
	if (fd == -1 && errno == EEXIST) {
		printf("shm_open() can not create a new object.\n");
		return PTS_FAIL;
	} else if (fd == -1) {
		perror("shm_open");
		return PTS_UNRESOLVED;
	}

	printf("Test PASSED\n");
	shm_unlink(SHM_NAME);
	return PTS_PASS;

}