| /* |
| * |
| * 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); |
| } |