1 /* This testcase is part of GDB, the GNU debugger. 2 3 Copyright 2015-2020 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #include <assert.h> 19 #include <pthread.h> 20 #include <unistd.h> 21 #include <stdio.h> 22 #include <sys/types.h> 23 #include <sys/wait.h> 24 25 26 /* Number of times the main process forks. */ 27 #define NFORKS 10 28 29 /* Number of threads by each fork child. */ 30 #define NTHREADS 10 31 32 static void * 33 thread_func (void *arg) 34 { 35 /* Empty. */ 36 return NULL; 37 } 38 39 static void 40 fork_child (void) 41 { 42 pthread_t threads[NTHREADS]; 43 int i; 44 int ret; 45 46 for (i = 0; i < NTHREADS; i++) 47 { 48 ret = pthread_create (&threads[i], NULL, thread_func, NULL); 49 assert (ret == 0); 50 } 51 52 for (i = 0; i < NTHREADS; i++) 53 { 54 ret = pthread_join (threads[i], NULL); 55 assert (ret == 0); 56 } 57 } 58 59 int 60 main (void) 61 { 62 pid_t childs[NFORKS]; 63 int i; 64 int status; 65 int num_exited = 0; 66 67 /* Don't run forever if the wait loop below gets stuck. */ 68 alarm (180); 69 70 for (i = 0; i < NFORKS; i++) 71 { 72 pid_t pid; 73 74 pid = fork (); 75 76 if (pid > 0) 77 { 78 /* Parent. */ 79 childs[i] = pid; 80 } 81 else if (pid == 0) 82 { 83 /* Child. */ 84 fork_child (); 85 return 0; 86 } 87 else 88 { 89 perror ("fork"); 90 return 1; 91 } 92 } 93 94 while (num_exited != NFORKS) 95 { 96 pid_t pid = wait (&status); 97 98 if (pid == -1) 99 { 100 perror ("wait"); 101 return 1; 102 } 103 104 if (WIFEXITED (status)) 105 { 106 num_exited++; 107 } 108 else 109 { 110 printf ("Hmm, unexpected wait status 0x%x from child %d\n", status, 111 pid); 112 } 113 } 114 115 return 0; 116 } 117