testcases/kernel/timers/clock_settime/clock_settime02.c

/*
 * Copyright (c) Wipro Technologies Ltd, 2003.  All Rights Reserved.
 *
 * 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.
 *
 */
/**************************************************************************
 *
 *    TEST IDENTIFIER	: clock_settime02
 *
 *    EXECUTED BY	: root / superuser
 *
 *    TEST TITLE	: Basic test for clock_settime(2)
 *
 *    TEST CASE TOTAL	: 1
 *
 *    AUTHOR		: Aniruddha Marathe <aniruddha.marathe@wipro.com>
 *
 *    SIGNALS
 * 	Uses SIGUSR1 to pause before test if option set.
 * 	(See the parse_opts(3) man page).
 *
 *    DESCRIPTION
 *     This is a Phase I test for the clock_settime(2) system call.
 *     It is intended to provide a limited exposure of the system call.
 *
 * 	Setup:
 *	  Setup signal handling.
 *	  Pause for SIGUSR1 if option specified.
 *
 * 	Test:
 *	 Loop if the proper options are given.
 *	 Set the parameters of timespec struct
 *	 Execute system call
 *	 Check return code, if system call failed (return=-1)
 *		Log the errno and Issue a FAIL message.
 *	 Otherwise, Issue a PASS message.
 *
 * 	Cleanup:
 * 	  Print errno log and/or timing stats if options given
 *
 * USAGE:  <for command-line>
 * clock_settime02 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-p]
 * where:
 * 	-c n : Run n copies simultaneously.
 *	-e   : Turn on errno logging.
 *	-i n : Execute test n times.
 *	-I x : Execute test for x seconds.
 *	-p   : Pause for SIGUSR1 before starting
 *	-P x : Pause for x seconds between iterations.
 *	-t   : Turn on syscall timing.
 *
 *RESTRICTIONS:
 * None
 *****************************************************************************/

#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include <signal.h>

#include "test.h"
#include "common_timers.h"

void setup(void);

char *TCID = "clock_settime02";	/* Test program identifier.    */
int TST_TOTAL = 1;		/* Total number of test cases. */
static struct timespec saved;	/* Used to reset the time */

int main(int ac, char **av)
{
	int lc;
	const char *msg;
	struct timespec spec;	/* Used to specify time for test */

	if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {

		tst_count = 0;

		spec.tv_sec = 1;
		spec.tv_nsec = 0;

		TEST(ltp_syscall(__NR_clock_settime, CLOCK_REALTIME, &spec));
		tst_resm((TEST_RETURN < 0 ? TFAIL | TTERRNO : TPASS),
			 "clock_settime %s",
			 (TEST_RETURN == 0 ? "passed" : "failed"));
	}

	cleanup();
	tst_exit();
}

/* setup() - performs all ONE TIME setup for this test */
void setup(void)
{

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	/* Check whether we are root */
	if (geteuid() != 0) {
		tst_brkm(TBROK, NULL, "Test must be run as root");
	}
	/* Save the current time specifications */
	if (ltp_syscall(__NR_clock_gettime, CLOCK_REALTIME, &saved) < 0)
		tst_brkm(TBROK, NULL, "Could not save the current time");

	TEST_PAUSE;
}

/*
 * cleanup() - Performs one time cleanup for this test at
 * completion or premature exit
 */

void cleanup(void)
{
	/* Set the saved time */
	if (clock_settime(CLOCK_REALTIME, &saved) < 0) {
		tst_resm(TWARN, "FATAL COULD NOT RESET THE CLOCK");
		tst_resm(TFAIL, "Error Setting Time, errno=%d", errno);
	}
}