blob: 32df083662e8298cf1603f2add5c662553af999a [file] [log] [blame]
/*
*
* 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
*/
/*
* NAME
* pipe07.c
*
* DESCRIPTION
* Test the ability of pipe to open the maximum even number of file
* descriptors permitted (or (maxfds - 3)/2 pipes)
*
* ALGORITHM
* 1. open pipes until EMFILE is returned
* 2. check to see that the number of pipes opened is
* (maxfds - 3) / 2
*
* USAGE: <for command-line>
* pipe07 [-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
* 12/2002 Ported by Paul Larson
*
* RESTRICTIONS
* None
*/
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include "test.h"
#include "usctest.h"
char *TCID = "pipe07";
int TST_TOTAL = 1;
int exp_enos[] = { EMFILE, 0 };
int pipe_ret, pipes[2];
char currdir[PATH_MAX];
char *tempdir = NULL;
void setup(void);
void cleanup(void);
int main(int ac, char **av)
{
int lc;
char *msg;
int min; /* number of file descriptors */
int usedfds; /* number of currently used file descriptors */
int npipes; /* number of pipes opened */
pid_t mypid; /* process of id of test */
char *cmdstring = NULL; /* hold command string to execute using system() */
FILE *f; /* used for retrieving the used fds */
if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL)
tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
setup();
/* Get the currently used number of file descriptors */
mypid = getpid();
cmdstring = malloc(BUFSIZ);
snprintf(cmdstring, BUFSIZ, "test -d /proc/%d/fd || exit 1 ; "
"ls -A -1 /proc/%d/fd | wc -l | awk {'print $1'} > pipe07.tmp",
mypid, mypid);
if (system(cmdstring) == 0) {
f = fopen("pipe07.tmp", "r");
fscanf(f, "%d", &usedfds);
fclose(f);
} else
usedfds = 3; /* Could not get processes used fds, so assume 3 */
unlink("pipe07.tmp");
TEST_EXP_ENOS(exp_enos);
for (lc = 0; TEST_LOOPING(lc); lc++) {
/* reset Tst_count in case we are looping */
Tst_count = 0;
min = getdtablesize();
/* subtract used fds */
min -= usedfds;
for (npipes = 0;; npipes++) {
pipe_ret = pipe(pipes);
if (pipe_ret < 0) {
if (errno != EMFILE) {
tst_brkm(TFAIL, cleanup,
"got unexpected error - %d",
errno);
}
break;
}
}
if (npipes == (min / 2))
tst_resm(TPASS, "Opened %d pipes", npipes);
else
tst_resm(TFAIL, "Unable to open maxfds/2 pipes");
}
cleanup();
tst_exit();
}
/*
* setup() - performs all ONE TIME setup for this test.
*/
void setup()
{
char template[PATH_MAX];
/* I had to do this, instead of tst_tmpdir() b/c I was receiving *
* a SIGSEGV for some reason when I tried to use tst_tmpdir/tst_rmdir */
/* Save current working directory */
getcwd(currdir, PATH_MAX);
/* Create temp directory and cd to it */
snprintf(template, PATH_MAX, "%s/%.3sXXXXXX", TEMPDIR, TCID);
tempdir = mkdtemp(template);
chdir(tempdir);
tst_sig(FORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
}
/*
* 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.
*/
TEST_CLEANUP;
/* I had to do this, instead of tst_tmpdir() b/c I was receiving *
* a SIGSEGV for some reason when I tried to use tst_tmpdir/tst_rmdir */
/* Chdir back to original working directory */
chdir(currdir);
rmdir(tempdir);
}