testcases/open_posix_testsuite/conformance/interfaces/fork/14-1.c

/*
* Copyright (c) 2004, Bull S.A..  All rights reserved.
* Created by: Sebastien Decugis

* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

* This sample test aims to check the following assertion:
*
* Opened semaphores are inherited in the child process..

* The steps are:
* -> Open 2 named semaphores, then unlink one.
* -> fork
* -> The child tries and posts both semaphores, then terminates.
* -> The parent waits for the child, then check the semaphores were posted

* The test fails if any semaphore has not been posted in the child.

*/

/* We are testing conformance to IEEE Std 1003.1, 2003 Edition */
#define _POSIX_C_SOURCE 200112L

#include <pthread.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <sys/wait.h>
#include <errno.h>

#include <semaphore.h>
#include <fcntl.h>

#include "../testfrmw/testfrmw.h"
#include "../testfrmw/testfrmw.c"

#ifndef VERBOSE
#define VERBOSE 1
#endif

int main(void)
{
	int ret, status;
	pid_t child, ctl;

	sem_t *sem_linked, *sem_unlinked;

	output_init();

	sem_linked = sem_open("/fork_14_1a", O_CREAT, O_RDWR, 0);

	if (sem_linked == SEM_FAILED) {
		UNRESOLVED(errno, "Failed to create the named semaphore");
	}

	sem_unlinked = sem_open("/fork_14_1b", O_CREAT, O_RDWR, 0);

	if (sem_unlinked == SEM_FAILED) {
		UNRESOLVED(errno, "Failed to create the named semaphore");
	}

	ret = sem_unlink("/fork_14_1b");

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to unlink the semaphore");
	}

	/* Create the child */
	child = fork();

	if (child == -1) {
		UNRESOLVED(errno, "Failed to fork");
	}

	/* child */
	if (child == 0) {
		do {
			ret = sem_post(sem_linked);
		}
		while ((ret != 0) && (errno == EINTR));

		if (ret != 0) {
			UNRESOLVED(errno, "Failed to post semaphore A");
		}

		do {
			ret = sem_post(sem_unlinked);
		}
		while ((ret != 0) && (errno == EINTR));

		if (ret != 0) {
			UNRESOLVED(errno, "Failed to post semaphore B");
		}

		/* We're done */
		exit(PTS_PASS);
	}

	/* Parent joins the child */
	ctl = waitpid(child, &status, 0);

	if (ctl != child) {
		UNRESOLVED(errno, "Waitpid returned the wrong PID");
	}

	if (!WIFEXITED(status) || (WEXITSTATUS(status) != PTS_PASS)) {
		FAILED("Child exited abnormally");
	}

	/* Check both semaphores have been posted */
	do {
		ret = sem_trywait(sem_linked);
	}
	while ((ret != 0) && (errno == EINTR));

	if (ret != 0) {
		if (errno == EAGAIN) {
			FAILED("Child did not inherit the semaphore A");
		} else {
			UNRESOLVED(errno, "sem_trywait failed");
		}
	}

	do {
		ret = sem_trywait(sem_unlinked);
	}
	while ((ret != 0) && (errno == EINTR));

	if (ret != 0) {
		if (errno == EAGAIN) {
			FAILED("Child did not inherit the semaphore B");
		} else {
			UNRESOLVED(errno, "sem_trywait failed");
		}
	}

	ret = sem_unlink("/fork_14_1a");

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to unlink semaphore A");
	}

	ret = sem_close(sem_linked);

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to close semaphore A");
	}

	ret = sem_close(sem_unlinked);

	if (ret != 0) {
		UNRESOLVED(errno, "Failed to close semaphore B");
	}

#if VERBOSE > 0
	output("Test passed\n");
#endif

	PASSED;
}