testcases/kernel/syscalls/readdir/readdir02.c

/*
 * Copyright (C) Bull S.A. 2001
 * 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
 */

/*
 * DESCRIPTION
 *      Try to readdir with Invalid directory stream descriptor dir.
 *
 * ALGORITHM
 *      loop if that option was specified
 *      call readdir() with an invalid file descriptor
 *      check the errno value
 *        issue a PASS message if we get EBADF - errno 9
 *      otherwise, the tests fails
 *        issue a FAIL message
 *        call cleanup
 *
 * NOTE
 *	The POSIX standard says:
 *	  The readdir() function may fail if:
 *	  [EBADF] The dirp argument does not refer to an open directory stream.
 *	  (Note that readdir() is not _required_ to fail in this case.)
 *
 * HISTORY
 *      04/2002 - Written by Jacky Malcles
 *
 *      06/2003 - Added code to catch SIGSEGV and return TCONF.
 *		Robbie Williamson<robbiew@us.ibm.com>
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <signal.h>

#include "test.h"

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

char *TCID = "readdir02";
int TST_TOTAL = 1;

int main(int ac, char **av)
{
	int lc;
	const char *msg;
	DIR *test_dir;
	struct dirent *dptr;

	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;

		if ((test_dir = opendir(".")) == NULL) {
			tst_resm(TFAIL, "opendir(\".\") Failed, errno=%d : %s",
				 errno, strerror(errno));
		} else {
			if (closedir(test_dir) < 0) {
				tst_resm(TFAIL,
					 "closedir(\".\") Failed, errno=%d : %s",
					 errno, strerror(errno));
			} else {
				dptr = readdir(test_dir);
				switch (errno) {
				case EBADF:
					tst_resm(TPASS,
						 "expected failure - errno = %d : %s",
						 errno, strerror(errno));
					break;
				default:
					if (dptr != NULL) {
						tst_brkm(TFAIL, cleanup,
							 "call failed with an "
							 "unexpected error - %d : %s",
							 errno,
							 strerror(errno));
					} else {
						tst_resm(TINFO,
							 "readdir() is not _required_ to fail, "
							 "errno = %d  ", errno);
					}
				}
			}

		}

	}

	cleanup();
	tst_exit();
}

static void sigsegv_handler(int sig)
{
	tst_resm(TCONF,
		 "This system's implementation of closedir() will not allow this test to execute properly.");
	cleanup();
}

static void setup(void)
{
	struct sigaction act;

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	act.sa_handler = sigsegv_handler;
	act.sa_flags = 0;
	sigemptyset(&act.sa_mask);
	sigaction(SIGSEGV, &act, NULL);

	TEST_PAUSE;

	tst_tmpdir();
}

static void cleanup(void)
{
	tst_rmdir();
}