test/ipc/shmget/shmget04.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
 */

/*
 * NAME
 *	shmget04.c
 *
 * DESCRIPTION
 *	shmget04 - test for EACCES error
 *
 * ALGORITHM
 *	create a shared memory segment without read or write permissions
 *	loop if that option was specified
 *	  call shmget() with SHM_RW flag using TEST() macro
 *	  check the errno value
 *	    issue a PASS message if we get EACCES
 *	  otherwise, the tests fails
 *	    issue a FAIL message
 *	call cleanup
 *
 * USAGE:  <for command-line>
 *  shmget04 [-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
 *	03/2001 - Written by Wayne Boyer
 *
 * RESTRICTIONS
 *	none
 */
#include <pwd.h>
#include "ipcshm.h"

char *TCID = "shmget04";
int TST_TOTAL = 1;
extern int Tst_count;

int exp_enos[] = {EACCES, 0};	/* 0 terminated list of expected errnos */

char nobody_uid[] = "nobody";
struct passwd *ltpuser;

int shm_id_1 = -1;

int main(int ac, char **av)
{
	int lc;				/* loop counter */
	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();			/* global setup */

	/* The following loop checks looping state if -i option given */

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		/* reset Tst_count in case we are looping */
		Tst_count = 0;

		/*
		 * use the TEST() macro to make the call
		 */
	
		TEST(shmget(shmkey, SHM_SIZE, SHM_RW));
	
		if (TEST_RETURN != -1) {
			tst_resm(TFAIL, "call succeeded when error expected");
			continue;
		}
	
		TEST_ERROR_LOG(TEST_ERRNO);

		switch(TEST_ERRNO) {
		case EACCES:
			tst_resm(TPASS, "expected failure - errno = "
				 "%d : %s", TEST_ERRNO, strerror(TEST_ERRNO));
			break;
		default:
			tst_resm(TFAIL, "call failed with an "
				 "unexpected error - %d : %s",
				 TEST_ERRNO, strerror(TEST_ERRNO));
			break;
		}			
	}

	cleanup();

	/*NOTREACHED*/
	return(0);
}

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

	/* Set up the expected error numbers for -e option */
	TEST_EXP_ENOS(exp_enos);

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

	/* Switch to nobody user for correct error code collection */
        if (geteuid() != 0) {
                tst_brkm(TBROK, tst_exit, "Test must be run as root");
        }

	/*
	 * Create a temporary directory and cd into it.
	 * This helps to ensure that a unique msgkey is created.
	 * See ../lib/libipc.c for more information.
	 */
	tst_tmpdir();

        ltpuser = getpwnam(nobody_uid);
        if (seteuid(ltpuser->pw_uid) == -1) {
                tst_resm(TINFO, "setuid failed to "
                         "to set the effective uid to %d",
                         ltpuser->pw_uid);
                perror("seteuid");
        }


	/* get an IPC resource key */
	shmkey = getipckey();

	/* create a shared memory segment without read or access permissions */
	if ((shm_id_1 = shmget(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL)) == -1) {
		tst_brkm(TBROK, cleanup, "Failed to create shared memory "
			 "segment in setup");
	}
}

/*
 * cleanup() - performs all the ONE TIME cleanup for this test at completion
 * 	       or premature exit.
 */
void
cleanup(void)
{
	/* if it exists, remove the shared memory resource */
	rm_shm(shm_id_1);

        if (seteuid(0) == -1) {
                tst_resm(TINFO, "setuid failed to "
                         "to set the effective uid to root");
                perror("seteuid");
        }

	/* Remove the temporary directory */
	tst_rmdir();

	/*
	 * 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();
}

