testcases/kernel/syscalls/flock/flock06.c

/*
 *
 *   Copyright (c) Matthew Wilcox for Hewlett Packard 2003
 *
 *   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
 */

/**********************************************************
 *
 *    TEST IDENTIFIER   : flock06
 *
 *    EXECUTED BY       : anyone
 *
 *    TEST TITLE        : Error condition test for flock(2)
 *
 *    TEST CASE TOTAL   : 1
 *
 *    AUTHOR            : Matthew Wilcox <willy@debian.org>
 *
 *    SIGNALS
 *      Uses SIGUSR1 to pause before test if option set.
 *      (See the parse_opts(3) man page).
 *
 *    DESCRIPTION
 * 		 This test verifies that flock locks held on one fd conflict with
 * 		 flock locks held on a different fd.
 *
 *		 Test:
 * 		 		 The process opens two file descriptors on the same file.
 * 		 		 It acquires an exclusive flock on the first descriptor,
 * 		 		 checks that attempting to acquire an flock on the second
 * 		 		 descriptor fails.  Then it removes the first descriptor's
 * 		 		 lock and attempts to acquire an exclusive lock on the
 * 		 		 second descriptor.
 *
 * USAGE:  <for command-line>
 *      flock06 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p]
 *                      where,  -c n : Run n copies concurrently
 *                              -f   : Turn off functional testing
 *    		 		 		 		 -e   : Turn on errno logging
 *                              -h   : Show help screen
 *		 		 		 		 -i n : Execute test n times
 *                              -I x : Execute test for x seconds
 *                              -p   : Pause for SIGUSR1 before starting
 *                              -P x : Pause for x seconds between iterations
 *                              -t   : Turn on syscall timing
 *
 ****************************************************************/

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

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

char *TCID = "flock06";
int TST_TOTAL = 3;
char filename[100];

int main(int argc, char **argv)
{
	int lc;
	const char *msg;

	if ((msg = parse_opts(argc, argv, NULL, NULL)) != NULL) {
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
	}

	setup();

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

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		int fd1, fd2;

		/* reset tst_count in case we are looping */
		tst_count = 0;

		fd1 = open(filename, O_RDWR);
		if (fd1 == -1)
			tst_brkm(TFAIL, cleanup, "failed to open the"
				 "file, errno %d", errno);

		TEST(flock(fd1, LOCK_EX | LOCK_NB));
		if (TEST_RETURN != 0)
			tst_resm(TFAIL, "First attempt to flock() failed, "
				 "errno %d", TEST_ERRNO);
		else
			tst_resm(TPASS, "First attempt to flock() passed");

		fd2 = open(filename, O_RDWR);
		if (fd2 == -1)
			tst_brkm(TFAIL, cleanup, "failed to open the"
				 "file, errno %d", errno);

		TEST(flock(fd2, LOCK_EX | LOCK_NB));
		if (TEST_RETURN == -1)
			tst_resm(TPASS, "Second attempt to flock() denied");
		else
			tst_resm(TFAIL, "Second attempt to flock() succeeded!");

		TEST(flock(fd1, LOCK_UN));
		if (TEST_RETURN == -1)
			tst_resm(TFAIL, "Failed to unlock fd1, errno %d",
				 TEST_ERRNO);
		else
			tst_resm(TPASS, "Unlocked fd1");

		TEST(flock(fd2, LOCK_EX | LOCK_NB));
		if (TEST_RETURN == -1)
			tst_resm(TFAIL, "Third attempt to flock() denied!");
		else
			tst_resm(TPASS, "Third attempt to flock() succeeded");
		close(fd1);
		close(fd2);

	}

	cleanup();
	tst_exit();

}

/*
 * setup()
 *		 performs all ONE TIME setup for this test
 */
void setup(void)
{
	int fd;

	tst_sig(FORK, DEF_HANDLER, cleanup);

	/* Pause if that option was specified
	 * TEST_PAUSE contains the code to fork the test with the -i option.
	 * You want to make sure you do this before you create your temporary
	 * directory.
	 */
	TEST_PAUSE;

	/* Create a unique temporary directory and chdir() to it. */
	tst_tmpdir();

	sprintf(filename, "flock06.%d", getpid());

	/* creating temporary file */
	fd = creat(filename, 0666);
	if (fd < 0) {
		tst_resm(TFAIL, "creating a new file failed");

		/* Removing temp dir */
		tst_rmdir();

		tst_exit();
	}
	close(fd);
}

/*
 * cleanup()
 *		 performs all ONE TIME cleanup for this test at
 * 		 completion or premature exit
 */
void cleanup(void)
{

	unlink(filename);
	tst_rmdir();

}