testcases/kernel/fs/stream/stream01.c

/*
 *
 *   Copyright (c) International Business Machines  Corp., 2002
 *
 *   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
 */

/* ported from SPIE section2/filesuite/stream1.c, by Airong Zhang */

/*======================================================================
	=================== TESTPLAN SEGMENT ===================
>KEYS:  < freopen()
>WHAT:  < 1) check that freopen substitutes the named file in place of stream.
>HOW:   < 1) open a stream, write something to it, perform freopen and
	<    write some more. Check that second write to stream went to
	<    the file specified by freopen.
>BUGS:  <
======================================================================*/

#include <stdio.h>
#include <errno.h>
#include "test.h"

char *TCID = "stream01";
int TST_TOTAL = 1;
int local_flag;

#define PASSED 1
#define FAILED 0

/* XXX: add setup and cleanup. */

char progname[] = "stream01()";
char tempfile1[40] = "";
char tempfile2[40] = "";

/*--------------------------------------------------------------------*/
int main(int ac, char *av[])
{
	FILE *stream;
	char buf[10];
	int i;
	int lc;
	const char *msg;

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

	local_flag = PASSED;
	tst_tmpdir();
	for (lc = 0; TEST_LOOPING(lc); lc++) {

		sprintf(tempfile1, "stream011.%d", getpid());
		sprintf(tempfile2, "stream012.%d", getpid());
	/*--------------------------------------------------------------------*/
		//block0:
		if ((stream = fopen(tempfile1, "a+")) == NULL) {
			tst_brkm(TFAIL, NULL, "fopen(%s) a+ failed: %s",
				 tempfile1,
				 strerror(errno));
		}
		fwrite("a", 1, 1, stream);
		if ((stream = freopen(tempfile2, "a+", stream)) == NULL) {
			tst_brkm(TFAIL | TERRNO, NULL, "freopen(%s) a+ failed",
				 tempfile2);
		}
		fwrite("a", 1, 1, stream);
		fclose(stream);

		/* now check that a single "a" is in each file */
		if ((stream = fopen(tempfile1, "r")) == NULL) {
			tst_brkm(TFAIL | TERRNO, NULL, "fopen(%s) r failed",
				 tempfile1);
		} else {
			for (i = 0; i < 10; i++)
				buf[i] = 0;
			fread(buf, 1, 1, stream);
			if ((buf[0] != 'a') || (buf[1] != 0)) {
				tst_resm(TFAIL, "bad contents in %s",
					 tempfile1);
				local_flag = FAILED;
			}
			fclose(stream);
		}
		if ((stream = fopen(tempfile2, "r")) == NULL) {
			tst_brkm(TFAIL | TERRNO, NULL, "fopen(%s) r failed",
				 tempfile2);
		} else {
			for (i = 0; i < 10; i++)
				buf[i] = 0;
			fread(buf, 1, 1, stream);
			if ((buf[0] != 'a') || (buf[1] != 0)) {
				tst_resm(TFAIL, "bad contents in %s",
					 tempfile2);
				local_flag = FAILED;
			}
			fclose(stream);
		}
		if (local_flag == PASSED) {
			tst_resm(TPASS, "Test passed.");
		} else {
			tst_resm(TFAIL, "Test failed.");
		}

		local_flag = PASSED;

	/*--------------------------------------------------------------------*/
		unlink(tempfile1);
		unlink(tempfile2);

	}			/* end for */
	tst_rmdir();
	tst_exit();
}