testcases/kernel/syscalls/chdir/chdir04.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
 * 	chdir04.c
 *
 * DESCRIPTION
 *	Testcase to test whether chdir(2) sets errno correctly.
 *
 * ALGORITHM
 *	1.	Test for ENAMETOOLONG:
 *		Create a bad directory name with length more than
 *
 *		VFS_MAXNAMELEN (Linux kernel variable), and attempt to
 *		chdir(2) to it.
 *
 *	2.	Test for ENOENT:
 *		Attempt to chdir(2) on a non-existent directory
 *
 *	3.	Test for EFAULT:
 *		Pass an address which lies outside the address space of the
 *		process, and expect an EFAULT.
 *
 * USAGE:  <for command-line>
 * chdir04 [-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 <stdio.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "test.h"

char *TCID = "chdir04";

char bad_dir[] =
    "abcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyzabcdefghijklmnopqrstmnopqrstuvwxyz";

char noexist_dir[] = "/tmp/noexistdir";

struct test_case_t {
	char *dname;
	int error;
} TC[] = {
	/*
	 * to test whether chdir() is setting ENAMETOOLONG if the
	 * directory is more than VFS_MAXNAMELEN
	 */
	{
	bad_dir, ENAMETOOLONG},
	    /*
	     * to test whether chdir() is setting ENOENT if the
	     * directory is not existing.
	     */
	{
	noexist_dir, ENOENT},
#ifndef UCLINUX
	    /*
	     * to test whether chdir() is setting EFAULT if the
	     * directory is an invalid address.
	     */
	{
	(void *)-1, EFAULT}
#endif
};

int TST_TOTAL = ARRAY_SIZE(TC);

int flag;
#define	FAILED	1

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

char *bad_addr = 0;

int main(int ac, char **av)
{
	int lc;
	int i;
	const char *msg;

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

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		tst_count = 0;

		for (i = 0; i < TST_TOTAL; i++) {

			TEST(chdir(TC[i].dname));

			if (TEST_RETURN != -1) {
				tst_resm(TFAIL, "call succeeded unexpectedly");
				continue;
			}

			if (TEST_ERRNO == TC[i].error)
				tst_resm(TPASS | TTERRNO, "failed as expected");
			else {
				tst_resm(TFAIL | TTERRNO,
					 "didn't fail as expected (expected %d)",
					 TC[i].error);
			}
		}
	}
	cleanup();

	tst_exit();

}

void setup(void)
{

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	TEST_PAUSE;

	tst_tmpdir();

#ifdef UCLINUX
	bad_addr = mmap(0, 1, PROT_NONE,
			MAP_PRIVATE_EXCEPT_UCLINUX | MAP_ANONYMOUS, 0, 0);
	if (bad_addr == MAP_FAILED)
		tst_brkm(TBROK | TERRNO, cleanup, "mmap() failed");
	TC[2].dname = bad_addr;
#endif
}

void cleanup(void)
{
	tst_rmdir();

}