xref: /external/ltp/testcases/open_posix_testsuite/conformance/interfaces/timer_gettime/1-2.c

/*
 * 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 timer_gettime() sets sets itimerspec.it_value to the
 * amount of time remaining in the middle of a timer.
 * - Create and arm a timer for TIMERSEC seconds.
 * - Sleep for SLEEPSEC < TIMERSEC.
 * - Call timer_gettime().
 * - Ensure the value returned is within ACCEPTABLEDELTA less than
 *   TIMERSEC-SLEEPSEC.
 *
 * Signal SIGCONT will be used so that it will not affect the test if
 * the timer expires.
 * Clock CLOCK_REALTIME will be used.
 */

#include <time.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include "posixtest.h"

#define TIMERSEC 8
#define SLEEPSEC 2
#define ACCEPTABLEDELTA 1

int main(void)
{
	struct sigevent ev;
	timer_t tid;
	struct itimerspec itsset, itsget;
	int delta;

	ev.sigev_notify = SIGEV_SIGNAL;
	ev.sigev_signo = SIGCONT;

	itsset.it_interval.tv_sec = 0;
	itsset.it_interval.tv_nsec = 0;
	itsset.it_value.tv_sec = TIMERSEC;
	itsset.it_value.tv_nsec = 0;

	if (timer_create(CLOCK_REALTIME, &ev, &tid) != 0) {
		perror("timer_create() did not return success\n");
		return PTS_UNRESOLVED;
	}

	if (timer_settime(tid, 0, &itsset, NULL) != 0) {
		perror("timer_settime() did not return success\n");
		return PTS_UNRESOLVED;
	}

	if (sleep(SLEEPSEC) != 0) {
		perror("sleep() did not return 0\n");
		return PTS_UNRESOLVED;
	}

	if (timer_gettime(tid, &itsget) != 0) {
		perror("timer_gettime() did not return success\n");
		return PTS_UNRESOLVED;
	}

	delta = (itsset.it_value.tv_sec - SLEEPSEC) - itsget.it_value.tv_sec;

	if (delta < 0) {
		printf("FAIL:  timer_gettime() value > time expected left\n");
		printf("%d > %d\n", (int)itsget.it_value.tv_sec,
		       (int)itsset.it_value.tv_sec - SLEEPSEC);
		return PTS_FAIL;
	}

	if (delta <= ACCEPTABLEDELTA) {
		printf("Test PASSED\n");
		return PTS_PASS;
	}

	printf("FAIL:  timer_gettime() value !~= time expected left\n");
	printf("%d !~= %d\n", (int)itsget.it_value.tv_sec,
	       (int)itsset.it_value.tv_sec - SLEEPSEC);
	return PTS_FAIL;
}