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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
* open04.c
*
* DESCRIPTION
* Testcase to check that open(2) sets EMFILE if a process opens files
* more than its descriptor size
*
* ALGORITHM
* First get the file descriptor table size which is set for a process.
* Use open(2) for creating files till the descriptor table becomes full.
* These open(2)s should succeed. Finally use open(2) to open another
* file. This attempt should fail with EMFILE.
*
* USAGE: <for command-line>
* open04 [-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 Ported by Wayne Boyer
*
* RESTRICTIONS
* NONE
*
*/
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "test.h"
#include "usctest.h"
char *TCID = "open04";
int TST_TOTAL = 1;
extern int Tst_count;
int fd, ifile, mypid, first;
int nfile;
int *buf;
char fname[40];
int exp_enos[] = { EMFILE, 0 };
void setup(void);
void cleanup(void);
int main(int ac, char **av)
{
int lc; /* loop counter */
char *msg; /* message returned from parse_opts */
/* parse standard options */
if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) {
tst_brkm(TBROK, tst_exit, "OPTION PARSING ERROR - %s", msg);
}
setup();
TEST_EXP_ENOS(exp_enos);
/* check looping state if -i option given */
for (lc = 0; TEST_LOOPING(lc); lc++) {
/* reset Tst_count in case we are looping */
Tst_count = 0;
TEST(open(fname, O_RDWR | O_CREAT, 0777));
if (TEST_RETURN != -1) {
tst_resm(TFAIL, "call succeeded unexpectedly");
continue;
}
TEST_ERROR_LOG(TEST_ERRNO);
if (TEST_ERRNO != EMFILE) {
tst_resm(TFAIL, "Expected EMFILE, got %d", TEST_ERRNO);
} else {
tst_resm(TPASS, "call returned expected EMFILE error");
}
}
close(first);
close(fd);
cleanup();
/*NOTREACHED*/ return 0;
}
/*
* setup() - performs all ONE TIME setup for this test.
*/
void setup()
{
/* capture signals */
tst_sig(NOFORK, DEF_HANDLER, cleanup);
/* Pause if that option was specified */
TEST_PAUSE;
/* make a temporary directory and cd to it */
tst_tmpdir();
mypid = getpid();
nfile = getdtablesize();
sprintf(fname, "open04.%d", mypid);
if ((first = fd = open(fname, O_RDWR | O_CREAT, 0777)) == -1) {
tst_brkm(TBROK, cleanup, "Cannot open first file");
}
close(fd);
close(first);
unlink(fname);
/* Allocate memory for stat and ustat structure variables */
if ((buf = (int *)malloc(sizeof(int) * nfile - first)) == NULL) {
tst_brkm(TBROK, tst_exit, "Failed to allocate Memory");
}
for (ifile = first; ifile <= nfile; ifile++) {
sprintf(fname, "open04.%d.%d", ifile, mypid);
if ((fd = open(fname, O_RDWR | O_CREAT, 0777)) == -1) {
if (errno != EMFILE) {
tst_brkm(TBROK, cleanup, "Expected EMFILE got "
"%d", errno);
}
break;
}
buf[ifile - first] = fd;
}
}
/*
* 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;
for (ifile = first; ifile < nfile; ifile++) {
sprintf(fname, "open04.%d.%d", ifile, mypid);
close(buf[ifile - first]);
unlink(fname);
}
/* delete the test directory created in setup() */
tst_rmdir();
/* exit with return code appropriate for results */
tst_exit();
}