getpid02.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
 */

/*
 * Test Name: getpid01
 *
 * Test Description:
 *  Verify that getpid() system call gets the process ID of the of the
 *  calling process.
 *
 * Expected Result:
 *  getpid() should return pid of the process on success.
 *
 * Algorithm:
 *  Setup:
 *   Setup signal handling.
 *   Pause for SIGUSR1 if option specified.
 *
 *  Test:
 *   Loop if the proper options are given.
 *   Execute system call
 *   Check return code, if system call failed (return=-1)
 *   	Log the errno and Issue a FAIL message.
 *   Otherwise,
 *   	Verify the Functionality of system call	
 *      if successful,
 *      	Issue Functionality-Pass message.
 *      Otherwise,
 *		Issue Functionality-Fail message.
 *  Cleanup:
 *   Print errno log and/or timing stats if options given
 *
 * Usage:  <for command-line>
 *  getpid01 [-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 <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/wait.h>

#include "test.h"
#include "usctest.h"

void setup();			/* Main setup function of test */
void cleanup();			/* cleanup function for the test */

char *TCID="getpid01";		/* Test program identifier.    */
int TST_TOTAL=1;		/* Total number of test cases. */
extern int Tst_count;		/* Test Case counter for tst_* routines */

int
main(int ac, char **av)
{
	int lc;			/* loop counter */
	const char *msg;	/* message returned from parse_opts */
	pid_t proc_id;		/* process id of the test process */
	pid_t pid;		/* process id of the child process */
	pid_t pproc_id;		/* parent process id */
	int status;		/* exit status of child process */
    
	/* Parse standard options given to run the test. */
	msg = parse_opts(ac, av, (option_t *) NULL, NULL);
	if (msg != (char *) NULL) {
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
		tst_exit();
	}

	/* Perform global setup for test */
	setup();

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

		/* 
		 * Invoke getpid() to get the process id of
		 * the test process.
		 */
		TEST(getpid());

		/* Save the process id returned by getpid() */
		proc_id = TEST_RETURN;

		/*
		 * Perform functional verification if test
		 * executed without (-f) option.
		 */
		if (STD_FUNCTIONAL_TEST) {
			/* Fork a child now */
			if ((pid = fork()) < 0) {
				tst_resm(TFAIL, "fork() failed to create child,"
					 " error=%d", TEST_ERRNO);
			} else if (pid == 0) {	/* Child process */
				/* Get the parent process id */
				pproc_id = getppid();

				/* Verify if the two process IDs match */
				if (pproc_id != proc_id) {
					exit(1);
				}
				exit(0);
			} else {	/* parent process */
				wait(&status);

				/* Check exit status of child */
				if (WEXITSTATUS(status) != 0) {
					tst_resm(TFAIL, "getpid() returned "
						 "invalid pid %d", proc_id);
				} else {
					tst_resm(TPASS, "Functionality of "
						 "getpid() successful");
				}
			}
		} else {
			tst_resm(TPASS, "call succeeded");
		}
	}	/* End for TEST_LOOPING */

	/* Call cleanup() to undo setup done for the test. */
	cleanup();

	/*NOTREACHED*/
}	/* End main */

/*
 * setup() - performs all ONE TIME setup for this test.
 * 	     Setup signal catching function.
 */
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();
}