blob: 78663359800ae64f8d77cf00a8fbf8bfc5476628 [file] [log] [blame]
/*
*
* 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
* creat05.c
*
* DESCRIPTION
* Testcase to check that creat(2) system call returns EMFILE.
*
* ALGORITHM
* A process creates a temporary test directory, then it should
* get the system configured NOFILE parameter (ie. the maximum no. of
* open files of a process). This can be done using the getdtablesize()
* system call. Once this is determined, the process should attempt
* to creat(2) the this no. of files (can be done using a "for" loop).
* Then, the process should attempt to creat() another file, which should
* fail with EMFILE.
*
* USAGE
* creat05
*
* HISTORY
* 07/2001 Ported by Wayne Boyer
*
* RESTRICTIONS
* None
*/
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/limits.h>
#include <unistd.h>
#include "test.h"
#include "usctest.h"
char *TCID = "creat05";
int TST_TOTAL = 1;
#define MODE 0666
void remove_files(int);
void setup(void);
void cleanup(void);
int exp_enos[] = { EMFILE, 0 };
int fd, ifile, mypid, first;
int *buf;
char fname[40];
int main(int ac, char **av)
{
int lc;
char *msg;
if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) {
tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
}
setup();
TEST_EXP_ENOS(exp_enos);
for (lc = 0; TEST_LOOPING(lc); lc++) {
/* reset tst_count in case we are looping */
tst_count = 0;
TEST(creat(fname, MODE));
if (TEST_RETURN != -1) {
tst_resm(TFAIL, "call succeeded unexpectedly");
continue;
}
TEST_ERROR_LOG(TEST_ERRNO);
if (TEST_ERRNO == EMFILE) {
tst_resm(TPASS, "call failed with expected error - "
"EMFILE");
} else {
tst_resm(TFAIL | TTERRNO, "Expected EMFILE");
}
remove_files(ifile);
}
cleanup();
tst_exit();
}
/*
* setup() - performs all ONE TIME setup for this test.
*/
void setup()
{
int max_open;
tst_sig(NOFORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
/* make a temporary directory and cd to it */
tst_tmpdir();
umask(0);
mypid = getpid();
sprintf(fname, "creat05.%d", mypid);
unlink(fname);
/* create a file to get the first file descriptor available */
if ((first = fd = creat(fname, MODE)) == -1) {
tst_brkm(TFAIL, cleanup, "Cannot open first file");
}
close(fd);
unlink(fname);
tst_resm(TINFO, "first file is #%d", fd);
/* get the maximum number of files that we can open */
max_open = getdtablesize();
/* Allocate memory for stat and ustat structure variables */
if ((buf = (int *)malloc(sizeof(int) * max_open - first)) == NULL) {
tst_brkm(TBROK, NULL, "Failed to allocate Memory");
}
/* now open as many files as we can up to max_open */
for (ifile = first; ifile <= max_open; ifile++) {
sprintf(fname, "creat05.%d.%d", ifile, mypid);
if ((fd = creat(fname, 0666)) == -1) {
tst_resm(TINFO, "could not creat file "
"#%d", ifile + 1);
if (errno != EMFILE) {
remove_files(ifile);
tst_brkm(TBROK | TERRNO, cleanup,
"Failed unexpectedly (expected EMFILE)");
}
break;
}
buf[ifile - first] = fd;
}
}
/*
* remove_files - remove the temporary files that were created
*/
void remove_files(int nfiles)
{
int i;
for (i = first; i < nfiles; i++) {
sprintf(fname, "creat05.%d.%d", i, mypid);
close(buf[i - first]);
unlink(fname);
}
}
/*
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit.
*/
void cleanup()
{
/*
* print timing stats if that option was specified.
* print errno log if that option was specified.
*/
close(first);
TEST_CLEANUP;
/* delete the test directory created in setup() */
tst_rmdir();
}