| /* |
| * 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 |
| * fork12.c |
| * |
| * DESCRIPTION |
| * Check that all children inherit parent's file descriptor |
| * |
| * ALGORITHM |
| * Parent forks processes until -1 is returned.$ |
| * |
| * USAGE |
| * fork12 |
| * ** CAUTION ** Can hang your machine, esp prior to 2.4.19 |
| * |
| * HISTORY |
| * 07/2001 Ported by Wayne Boyer |
| * 07/2002 Split from fork07 as a test case to exhaust available pids. |
| * |
| * RESTRICTIONS |
| * Should be run as root to avoid resource limits.$ |
| * Should not be run with other test programs because it tries to |
| * use all available pids. |
| */ |
| |
| #include <stdio.h> |
| #include <sys/wait.h> |
| #include <errno.h> |
| #include <string.h> |
| #include "test.h" |
| #include "usctest.h" |
| |
| char *TCID = "fork12"; |
| int TST_TOTAL = 1; |
| |
| static void setup(void); |
| static void cleanup(void); |
| static void fork12_sigs(int signum); |
| |
| int main(int ac, char **av) |
| { |
| int forks, pid1, fork_errno, waitstatus; |
| int ret, status; |
| int lc; |
| const char *msg; |
| |
| msg = parse_opts(ac, av, NULL, NULL); |
| if (msg != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| |
| tst_resm(TINFO, "Forking as many kids as possible"); |
| forks = 0; |
| while ((pid1 = fork()) != -1) { |
| if (pid1 == 0) { /* child */ |
| pause(); |
| exit(0); |
| } |
| forks++; |
| ret = waitpid(-1, &status, WNOHANG); |
| if (ret < 0) |
| tst_brkm(TBROK, cleanup, |
| "waitpid failed %d: %s\n", errno, |
| strerror(errno)); |
| if (ret > 0) { |
| /* a child may be killed by OOM killer */ |
| if (WTERMSIG(status) == SIGKILL) |
| break; |
| tst_brkm(TBROK, cleanup, |
| "child exit with error code %d or signal %d", |
| WEXITSTATUS(status), WTERMSIG(status)); |
| } |
| } |
| fork_errno = errno; |
| |
| /* parent */ |
| tst_resm(TINFO, "Number of processes forked is %d", forks); |
| tst_resm(TPASS, "fork() eventually failed with %d: %s", |
| fork_errno, strerror(fork_errno)); |
| /* collect our kids */ |
| /* |
| * Introducing a sleep(3) to make sure all children are |
| * at pause() when SIGQUIT is sent to them |
| */ |
| sleep(3); |
| kill(0, SIGQUIT); |
| while (wait(&waitstatus) > 0) ; |
| |
| } |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| tst_sig(FORK, fork12_sigs, cleanup); |
| TEST_PAUSE; |
| } |
| |
| static void cleanup(void) |
| { |
| int waitstatus; |
| |
| /* collect our kids */ |
| kill(0, SIGQUIT); |
| while (wait(&waitstatus) > 0) ; |
| TEST_CLEANUP; |
| } |
| |
| static void fork12_sigs(int signum) |
| { |
| if (signum == SIGQUIT) { |
| /* Children will continue, parent will ignore */ |
| } else { |
| tst_brkm(TBROK, cleanup, |
| "Unexpected signal %d received.", signum); |
| } |
| } |