getppid02.c

cygwin, 著名的在win32下模拟unix操作系统的东东

/*
 *
 *   Copyright (c) International Business Machines  Corp., 2001
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   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.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

/*
 * NAME
 * 	getppid01.c
 *
 * DESCRIPTION
 * 	Testcase to check the basic functionality of the getppid() syscall.
 *
 * USAGE:  <for command-line>
 *  getppid01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
 *     where,  -c n : Run n copies concurrently.
 *             -f   : Turn off functionality Testing.
 *             -i n : Execute test n times.
 *             -I x : Execute test for x seconds.
 *             -P x : Pause for x seconds between iterations.
 *             -t   : Turn on syscall timing.
 *
 * HISTORY
 *	07/2001 Ported by Wayne Boyer
 *
 * RESTRICTIONS
 * 	None
 */

#include <errno.h>
#include <test.h>
#include <usctest.h>

char *TCID = "getppid01";
int TST_TOTAL = 1;
extern int Tst_count;

void setup(void);
void cleanup(void);

main(int ac, char **av)
{
	int pid, ppid;

	int lc;				/* loop counter */
	const char *msg;		/* message returned from parse_opts */

	/*
	 * parse standard options
	 */
	if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
		tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
	}

	setup();

	/*
	 * check looping state if -i option is given
	 */
	for (lc = 0; TEST_LOOPING(lc); lc++) {
		/*
		 * reset Tst_count in case we are looping.
		 */
		Tst_count = 0;

		ppid = getpid();
		pid = fork();
		if (pid < 0) {
			tst_brkm(TBROK, cleanup, "fork() failed");
		}

		if (pid == 0) {			/* child */
			TEST(getppid());

			if (TEST_RETURN < 0)  {
				tst_resm(TFAIL, "something is really broken");
				continue;
			}

			if (STD_FUNCTIONAL_TEST) {
				if (TEST_RETURN != ppid) {
					tst_resm(TFAIL, "getppid() failed");
				} else {
					tst_resm(TPASS, "return value = "
						 "parent's pid value");
				}
			} else {
				tst_resm(TPASS, "call succeeded");
			}

		} else {
			wait(NULL);

			/* let the child carry on */
			exit(0);
		}
	}
	cleanup();

	/*NOTREACHED*/
}

/*
 * setup() - performs all ONE TIME setup for this test.
 */
void
setup()
{
	/* capture signals */
	tst_sig(FORK, DEF_HANDLER, cleanup);

	/* Pause if that option was specified */
	TEST_PAUSE;
}


/*
 * cleanup() - performs all ONE TIME cleanup for this test at
 *	       completion or premature exit.
 */
void
cleanup()
{
	/*
	 * print timing stats if that option was specified.
	 * print errno log if that option was specified.
	 */
	TEST_CLEANUP;

	/* exit with return code appropriate for results */
	tst_exit();
}