android13/external/ltp/testcases/kernel/syscalls/dup2/dup203.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
 *	dup203.c
 *
 * DESCRIPTION
 *	Testcase to check the basic functionality of dup2().
 *
 * ALGORITHM
 *	1.	Attempt to dup2() on an open file descriptor.
 *	2.	Attempt to dup2() on a close file descriptor.
 *
 * USAGE:  <for command-line>
 *  dup203 [-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
 *
 * RESTRICTIONS
 *	NONE
 */

#include <fcntl.h>
#include <sys/param.h>
#include <errno.h>
#include <string.h>
#include "test.h"
#include "safe_macros.h"

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

char *TCID = "dup203";
int TST_TOTAL = 1;

int main(int ac, char **av)
{
	int fd0, fd1, fd2, rval;
	char filename0[40], filename1[40];
	char buf[40];

	int lc;

	tst_parse_opts(ac, av, NULL, NULL);

	setup();

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

		tst_count = 0;
//block1:
		tst_resm(TINFO, "Enter block 1");
		tst_resm(TINFO, "Test duping over an open fd");

		sprintf(filename0, "dup202.file0.%d\n", getpid());
		sprintf(filename1, "dup202.file1.%d\n", getpid());
		unlink(filename0);
		unlink(filename1);

		if ((fd0 = creat(filename0, 0666)) == -1)
			tst_brkm(TBROK, cleanup, "cannot create first file");
		if (write(fd0, filename0, strlen(filename0)) == -1)
			tst_brkm(TBROK, cleanup, "filename0: write(2) failed");

		if ((fd1 = creat(filename1, 0666)) == -1)
			tst_brkm(TBROK, cleanup, "Cannot create second file");
		if (write(fd1, filename1, strlen(filename1)) == -1)
			tst_brkm(TBROK, cleanup, "filename1: write(2) failed");

		SAFE_CLOSE(cleanup, fd0);
		if ((fd0 = open(filename0, O_RDONLY)) == -1)
			tst_brkm(TBROK, cleanup, "open(2) on filename0 failed");

		SAFE_CLOSE(cleanup, fd1);
		if ((fd1 = open(filename1, O_RDONLY)) == -1)
			tst_brkm(TBROK, cleanup, "open(2) on filename1 failed");

		TEST(dup2(fd0, fd1));

		if ((fd2 = TEST_RETURN) == -1) {
			tst_resm(TFAIL, "call failed unexpectedly");
		} else {
			if (fd1 != fd2) {
				tst_resm(TFAIL, "file descriptors don't match");
				break;
			}

			memset(buf, 0, sizeof(buf));
			if (read(fd2, buf, sizeof(buf)) == -1)
				tst_brkm(TBROK, cleanup, "read(2) failed");
			if (strcmp(buf, filename0) != 0)
				tst_resm(TFAIL, "read from file got bad data");
			tst_resm(TPASS, "dup2 test 1 functionality is correct");
		}

		close(fd0);
		close(fd1);
		close(fd2);
		unlink(filename0);
		unlink(filename1);

		tst_resm(TINFO, "Exit block 1");

//block2:
		tst_resm(TINFO, "Enter block 2");
		tst_resm(TINFO, "Test close on exec flag");

		sprintf(filename0, "dup02.%d\n", getpid());
		unlink(filename0);

		if ((fd0 = creat(filename0, 0666)) == -1) {
			tst_brkm(TBROK, cleanup, "Cannot create first file");
		}
		if (fcntl(fd0, F_SETFD, 1) == -1) {
			tst_brkm(TBROK, cleanup, "setting close on exec flag "
				 "on fd0 failed");
		}

		if ((fd2 = creat(filename1, 0666)) == -1) {
			tst_brkm(TBROK, cleanup, "Cannot create second file");
		}

		/* SAFE_CLOSE() sets the fd to -1 avoid it here */
		rval = fd2;
		SAFE_CLOSE(cleanup, rval);

		TEST(dup2(fd0, fd2));

		if ((fd1 = TEST_RETURN) == -1) {
			tst_resm(TFAIL, "call failed unexpectedly");
		} else {
			if (fd1 != fd2) {
				tst_resm(TFAIL, "bad dup2 descriptor %d", fd1);
				break;
			}

			if ((rval = fcntl(fd1, F_GETFD, 0)) != 0) {
				tst_resm(TBROK | TERRNO,
					 "fcntl F_GETFD on fd1 failed; expected a "
					 "return value of 0x0, got %#x", rval);
				break;
			}
			if ((rval = (fcntl(fd0, F_GETFL, 0) & O_ACCMODE)) !=
			    O_WRONLY) {
				tst_resm(TFAIL, "fctnl F_GETFL bad rval on fd0 "
					 "Expected %#x got %#x", O_WRONLY,
					 rval);
			}
			tst_resm(TPASS, "dup2 test 2 functionality is correct");
		}

		close(fd0);
		close(fd1);

		unlink(filename0);
		unlink(filename1);
		tst_resm(TINFO, "Exit block 2");
	}

	cleanup();
	tst_exit();
}

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

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	TEST_PAUSE;

	tst_tmpdir();
}

/*
 * cleanup() - performs all ONE TIME cleanup for this test at
 *	       completion or premature exit.
 */
void cleanup(void)
{
	tst_rmdir();
}