1 /* 2 * Copyright (c) International Business Machines Corp., 2001 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 12 * the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 * 18 * NAME 19 * fork06.c 20 * 21 * DESCRIPTION 22 * Test that a process can fork children a large number of 23 * times in succession 24 * 25 * ALGORITHM 26 * Attempt to fork a child that exits immediately 27 * Repeat it many times(1000), counting the number of successes and 28 * failures 29 * 30 * USAGE 31 * fork06 32 * 33 * HISTORY 34 * 07/2001 Ported by Wayne Boyer 35 * 36 * RESTRICTIONS 37 * None 38 */ 39 40 #include <sys/types.h> 41 #include <sys/wait.h> 42 #include <stdio.h> 43 #include "test.h" 44 45 char *TCID = "fork06"; 46 int TST_TOTAL = 1; 47 48 static void setup(void); 49 static void cleanup(void); 50 51 #define NUMFORKS 1000 52 53 int main(int ac, char **av) 54 { 55 int i, pid, status, childpid, succeed, fail; 56 57 int lc; 58 59 tst_parse_opts(ac, av, NULL, NULL); 60 61 setup(); 62 63 for (lc = 0; TEST_LOOPING(lc); lc++) { 64 tst_count = 0; 65 succeed = 0; 66 fail = 0; 67 68 for (i = 0; i < NUMFORKS; i++) { 69 pid = fork(); 70 if (pid == -1) { 71 fail++; 72 continue; 73 } 74 75 if (pid == 0) 76 _exit(0); 77 78 childpid = wait(&status); 79 if (pid != childpid) 80 tst_resm(TFAIL, "pid from wait %d", childpid); 81 succeed++; 82 } 83 84 tst_resm(TINFO, "tries %d", i); 85 tst_resm(TINFO, "successes %d", succeed); 86 tst_resm(TINFO, "failures %d", fail); 87 88 if ((wait(&status)) == -1) 89 tst_resm(TINFO, "There were no children to wait for"); 90 else 91 tst_resm(TINFO, "There were children left"); 92 } 93 94 cleanup(); 95 tst_exit(); 96 } 97 98 static void setup(void) 99 { 100 tst_sig(FORK, DEF_HANDLER, cleanup); 101 TEST_PAUSE; 102 } 103 104 static void cleanup(void) 105 { 106 } 107
