| /* |
| * |
| * 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 |
| * fork06.c |
| * |
| * DESCRIPTION |
| * Test that a process can fork children a large number of |
| * times in succession |
| * |
| * ALGORITHM |
| * Attempt to fork a child that exits immediately |
| * Repeat it many times(1000), counting the number of successes and |
| * failures |
| * |
| * USAGE |
| * fork06 |
| * |
| * HISTORY |
| * 07/2001 Ported by Wayne Boyer |
| * |
| * RESTRICTIONS |
| * None |
| */ |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <stdio.h> |
| #include "test.h" |
| #include "usctest.h" |
| |
| char *TCID = "fork06"; |
| int TST_TOTAL = 1; |
| extern int Tst_count; |
| |
| void setup(void); |
| void cleanup(void); |
| |
| #define NUMFORKS 1000 |
| |
| int main(int ac, char **av) |
| { |
| int i, pid, status, childpid, succeed, fail; |
| |
| 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, cleanup, "OPTION PARSING ERROR - %s", msg); |
| /*NOTREACHED*/} |
| |
| /* |
| * perform global setup for the test |
| */ |
| setup(); |
| |
| /* |
| * check looping state if -i option is given |
| */ |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| /* |
| * reset Tst_count in case we are looping. |
| */ |
| Tst_count = 0; |
| |
| succeed = 0; |
| fail = 0; |
| |
| for (i = 0; i < NUMFORKS; i++) { |
| if ((pid = fork()) == -1) { |
| fail++; |
| continue; |
| } |
| |
| if (pid == 0) { /* child */ |
| _exit(0); |
| } |
| |
| /* parent */ |
| childpid = wait(&status); |
| if (pid != childpid) { |
| tst_resm(TFAIL, "pid from wait %d", childpid); |
| } |
| succeed++; |
| } |
| |
| tst_resm(TINFO, "tries %d", i); |
| tst_resm(TINFO, "successes %d", succeed); |
| tst_resm(TINFO, "failures %d", fail); |
| |
| if ((wait(&status)) == -1) { |
| tst_resm(TINFO, "There were no children to wait for"); |
| } else { |
| tst_resm(TINFO, "There were children left"); |
| } |
| } |
| cleanup(); |
| |
| /*NOTREACHED*/ return 0; |
| } |
| |
| /* |
| * setup() - performs all ONE TIME setup for this test |
| */ |
| void setup() |
| { |
| /* |
| * capture signals |
| */ |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| |
| /* |
| * Pause if that option was specified |
| */ |
| 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; |
| |
| tst_exit(); |
| } |