testcases/kernel/syscalls/chroot/chroot02.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/*
 * NAME
 *	chroot02.c
 *
 * DESCRIPTION
 *	Test functionality of chroot(2)
 *
 * ALGORITHM
 *	Change root directory and then stat a file.
 *
 * USAGE:  <for command-line>
 *  chroot02 [-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
 *	04/2003 Modified by Manoj Iyer - manjo@mail.utexas.edu
 *	Change testcase to chroot into a temporary directory
 *	and stat() a known file.
 *
 * RESTRICTIONS
 *	NONE
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <errno.h>
#include "test.h"
#include <fcntl.h>

char *TCID = "chroot02";
int TST_TOTAL = 1;
int fileHandle = 0;

#define TMP_FILENAME	"chroot02_testfile"
struct stat buf;

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

int main(int ac, char **av)
{
	int lc;
	const char *msg;
	int pid, status, retval;

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

	setup();

	/* Check for 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;

		if ((pid = FORK_OR_VFORK()) == -1) {
			tst_brkm(TBROK, cleanup, "Could not fork");
		}

		if (pid == 0) {
			retval = 0;

			if (chroot(tst_get_tmpdir()) == -1) {
				perror("chroot failed");
				retval = 1;
			} else {
				if (stat("/" TMP_FILENAME, &buf) == -1) {
					retval = 1;
					perror("stat failed");
				}
			}

			exit(retval);
		}

		/* parent */
		wait(&status);
		/* make sure the child returned a good exit status */
		if (WIFSIGNALED(status) ||
		    (WIFEXITED(status) && WEXITSTATUS(status) != 0))
			tst_resm(TFAIL, "chroot functionality incorrect");
		else
			tst_resm(TPASS, "chroot functionality correct");
	}

	cleanup();
	tst_exit();

}

/*
 * setup() - performs all ONE TIME setup for this test.
 */
void setup(void)
{
	tst_require_root(NULL);

	tst_tmpdir();
	if ((fileHandle = creat(TMP_FILENAME, 0777)) == -1)
		tst_brkm(TBROK, cleanup, "failed to create temporary file "
			 TMP_FILENAME);
	if (stat(TMP_FILENAME, &buf) != 0)
		tst_brkm(TBROK, cleanup, TMP_FILENAME " does not exist");

	tst_sig(FORK, DEF_HANDLER, cleanup);

	TEST_PAUSE;
}

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

	tst_rmdir();

}