testcases/open_posix_testsuite/conformance/interfaces/fork/18-1.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., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.

* This sample test aims to check the following assertion:
*
* The per-process timers are not inherited.

* The steps are:
* -> Create a per-process timer
* -> fork
* -> check if the timer exists in child.

* The test fails if the timer expires in child (timer signal is delivered).

*/

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

/********************************************************************************************/
/****************************** standard includes *****************************************/
/********************************************************************************************/
#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 <signal.h>
 #include <time.h>

/********************************************************************************************/
/******************************   Test framework   *****************************************/
/********************************************************************************************/
#include "../testfrmw/testfrmw.h"
 #include "../testfrmw/testfrmw.c"
/* This header is responsible for defining the following macros:
 * UNRESOLVED(ret, descr);
 *    where descr is a description of the error and ret is an int (error code for example)
 * FAILED(descr);
 *    where descr is a short text saying why the test has failed.
 * PASSED();
 *    No parameter.
 *
 * Both three macros shall terminate the calling process.
 * The testcase shall not terminate in any other maneer.
 *
 * The other file defines the functions
 * void output_init()
 * void output(char * string, ...)
 *
 * Those may be used to output information.
 */

/********************************************************************************************/
/********************************** Configuration ******************************************/
/********************************************************************************************/
#ifndef VERBOSE
#define VERBOSE 1
#endif

/********************************************************************************************/
/***********************************    Test case   *****************************************/
/********************************************************************************************/

/* Global control value */
int notified;

/* Notification routine */
void notification(union sigval sv)
{
	if (sv.sival_int != SIGUSR1)
	{
		output("Got signal %d, expected %d\n", sv.sival_int, SIGUSR1);
		UNRESOLVED(1, "Unexpected notification");
	}

	notified = (int) getpid();
}

/* The main test function. */
int main(int argc, char * argv[])
{
	int ret, status;
	pid_t child, ctl;

	timer_t tmr;

	struct sigevent se;

	struct itimerspec it;

	/* Initialize output */
	output_init();

	notified = 0;

	/* Create the timer */
	se.sigev_notify = SIGEV_THREAD;
	se.sigev_signo = 0;
	se.sigev_value.sival_int = SIGUSR1;
	se.sigev_notify_function = &notification;
	se.sigev_notify_attributes = NULL; /* default detached thread */

	ret = timer_create(CLOCK_REALTIME, &se, &tmr);

	if (ret != 0)
	{
		UNRESOLVED(errno, "Failed to create a timer");
	}

	/* Arm the timer */
	it.it_interval.tv_nsec = 0;

	it.it_interval.tv_sec = 0;

	it.it_value.tv_sec = 0;

	it.it_value.tv_nsec = 500000000; /* 0.5 sec */

	ret = timer_settime(tmr, 0, &it, NULL);

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

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

	/* child */
	if (child == 0)
	{

		sleep(1);

		if (notified != 0)
		{
			if (notified == (int) getpid())
			{
				FAILED("Per-Process Timer was inherited in child");
			}
			else
			{
				output("Notification occured before the child forked");
			}
		}

		/* 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");
	}

	if (notified != (int) getpid())
	{
		output("Notified value: %d\n", notified);
		UNRESOLVED(-1, "No notification occured -- per process timers do not work?");
	}

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

#endif
	PASSED;
}