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/*
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* NAME
* write03.c
*
* DESCRIPTION
* Testcase to check that write(2) doesn't corrupt a file when it fails
*
* ALGORITHM
* Create a file for writing, write 100 bytes to it. Then make write(2)
* fail with some erroneous parameter, close the fd. Then reopen the
* file in RDONLY mode, and read the contents of the file. Compare the
* buffers, to see whether they are same.
*
* USAGE: <for command-line>
* write03 [-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 John George
* -Ported
*
* Restrictions
* NONE
*/
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <test.h>
#include <usctest.h>
/* 0 terminated list of expected errnos */
int exp_enos[] = {14,0};
char *TCID = "write03";
int TST_TOTAL = 1;
extern int Tst_count;
void setup(void);
void cleanup(void);
int fd = -1;
char filename[100];
main(int argc, char **argv)
{
int lc; /* loop counter */
const char *msg; /* message returned from parse_opts */
char wbuf[BUFSIZ], rbuf[BUFSIZ];
/* parse standard options */
if ((msg = parse_opts(argc, argv, (option_t *)NULL, NULL)) !=
(char *)NULL) {
tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
/*NOTREACHED*/
}
/* global setup */
setup();
/* The following loop checks looping state if -i option given */
for (lc = 0; TEST_LOOPING(lc); lc++) {
/* reset Tst_count in case we are looping */
Tst_count = 0;
block1:
tst_resm(TINFO, "Enter Block 1: test to check if write "
"corrupts the file when write fails");
fd = creat(filename, 0644);
if (fd < 0) {
tst_resm(TBROK, "creating a new file failed");
cleanup();
/*NOTREACHED*/
}
(void)memset(wbuf, '0', 100);
if (write(fd, wbuf, 100) == -1) {
tst_resm(TFAIL, "failed to write to %s", filename);
cleanup();
/*NOTREACHED*/
}
if (write(fd, (void *)-1, 100) != -1) {
tst_resm(TFAIL, "write(2) failed to fail");
cleanup();
/*NOTREACHED*/
}
TEST_ERROR_LOG(errno);
close(fd);
fd = -1;
if ((fd = open(filename, O_RDONLY)) == -1) {
tst_resm(TBROK, "open(2) failed, errno: %d", errno);
cleanup();
/*NOTREACHED*/
}
if (read(fd, rbuf, 100) == -1) {
tst_resm(TBROK, "read(2) failed, errno: %d", errno);
cleanup();
/*NOTREACHED*/
}
if (memcmp(wbuf, rbuf, 100) == 0) {
tst_resm(TPASS, "failure of write(2) didnot corrupt "
"the file");
} else {
tst_resm(TFAIL, "failure of write(2) corrupted the "
"file");
}
tst_resm(TINFO, "Exit block 1");
}
cleanup();
/*NOTREACHED*/
}
/*
* setup() - performs all ONE TIME setup for this test
*/
void
setup(void)
{
/* capture signals */
tst_sig(FORK, DEF_HANDLER, cleanup);
/* Set up the expected error numbers for -e option */
TEST_EXP_ENOS(exp_enos);
/* 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, "./write03.%d", getpid());
}
/*
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit
*/
void
cleanup(void)
{
/*
* print timing stats if that option was specified.
* print errno log if that option was specified.
*/
TEST_CLEANUP;
if (fd >= 0)
close (fd);
unlink(filename);
tst_rmdir();
/* exit with return code appropriate for results */
tst_exit();
/*NOTREACHED*/
}
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