testcases/kernel/syscalls/msync/msync03.c

/*
 *
 *   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: msync03
 *
 * Test Description:
 *  Verify that, msync() fails, when the region to synchronize, is outside
 *  the address space of the process.
 *
 * Expected Result:
 *  msync() should fail with a return value of -1, and errno should be
 *  set to EINVAL.
 *
 * 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)
 *      if errno set == expected errno
 *              Issue sys call fails with expected return value and errno.
 *      Otherwise,
 *              Issue sys call fails with unexpected errno.
 *   Otherwise,
 *      Issue sys call returns unexpected value.
 *
 *  Cleanup:
 *   Print errno log and/or timing stats if options given
 *
 * Usage:  <for command-line>
 *  msync03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
 *     where,  -c n : Run n copies concurrently.
 *	       -e   : Turn on errno logging.
 *	       -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 <unistd.h>
#include <sys/mman.h>
#include <sys/resource.h>

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

char *TCID="msync03";		/* Test program identifier.    */
int TST_TOTAL=1;		/* Total number of test cases. */
extern int Tst_count;		/* Test Case counter for tst_* routines */

char *addr;			/* addr of memory mapped region */
size_t page_sz;			/* system page size */

int exp_enos[] = {EINVAL, 0};

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

int
main(int ac, char **av)
{
	int lc;			/* loop counter */
	char *msg;		/* message returned from parse_opts */
	
	/* Parse standard options given to run the test. */
	msg = parse_opts(ac, av, (option_t *)NULL, NULL);
	if (msg != (char *)NULL) {
		tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg);
	}

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

	TEST_EXP_ENOS(exp_enos);

	/* 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;

		/* 
		 * Call msync to synchronize the memory region which
	 	 * points to outside the user address space.
		 */
		TEST(msync(addr, page_sz, MS_ASYNC));

		/* Check for the return value of msync() */
		if (TEST_RETURN != -1) {
			tst_resm(TFAIL, "msync() returns unexpected "
				 "value %d, expected:-1", TEST_RETURN);
			continue;
		}

		TEST_ERROR_LOG(TEST_ERRNO);

		/*
		 * Verify whether expected errno is
		 * set (EINVAL).
		 */
		if (errno == EINVAL) {
			tst_resm(TPASS, "msync() fails, Invalid address, "
				 "errno : %d", TEST_ERRNO);
		} else {
			tst_resm(TFAIL, "msync() fails, unexpected errno : %d, "
				 "expected: EINVAL", TEST_ERRNO);
		}
	}	/* End for TEST_LOOPING */

	/* Call cleanup() to exit the test. */
	cleanup();

	/*NOTREACHED*/
	return 0;

}	/* End main */

/*
 * setup() - performs all ONE TIME setup for this test.
 *
 * 	     Get system page size,
 * 	     Get an address outside the process address space.
 */
void 
setup()
{
		 struct rlimit brkval;		 /* variable to hold max. break val */

	/* capture signals */
	tst_sig(NOFORK, DEF_HANDLER, cleanup);

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

	/* Get the system page size */
	if ((page_sz = getpagesize()) < 0) {
		tst_brkm(TBROK, cleanup,
			 "getpagesize() failed to get system page size");
	}

		 /* call getrlimit function to get the maximum possible break value */
		 getrlimit(RLIMIT_DATA, &brkval);

		 /* Set the virtual memory address to maximum break value */
		 addr = (char *) brkval.rlim_max;
}

/*
 * cleanup() - performs all ONE TIME cleanup for this test at
 *             completion or premature exit.
 * 	       Exit the test with appropriate exit code.
 */
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();
}