1 /* fork a process that has created a detached thread. */ 2 3 #include <stdlib.h> 4 #include <sys/wait.h> 5 #include <pthread.h> 6 #include <sys/types.h> 7 #include <unistd.h> 8 #include <stdio.h> 9 #include <signal.h> 10 11 static void *threadmain(void *dummy) 12 { 13 sleep((unsigned long)dummy); 14 return NULL; 15 } 16 17 int main(int argc, char **argv) 18 { 19 int ctr; 20 pid_t childpid; 21 pthread_t childthread; 22 void *res; 23 int status; 24 25 pthread_create(&childthread, NULL, threadmain, (void *)2); 26 pthread_detach(childthread); 27 28 childpid = fork(); 29 switch (childpid) { 30 case 0: 31 pthread_create(&childthread, NULL, threadmain, 0); 32 pthread_join(childthread, &res); 33 exit(0); 34 break; 35 case -1: 36 perror("FAILED: fork failed\n"); 37 break; 38 default: 39 break; 40 } 41 42 ctr = 0; 43 while (waitpid(childpid, &status, 0) != childpid) { 44 sleep(1); 45 ctr++; 46 if (ctr >= 10) { 47 fprintf(stderr, "FAILED - timeout waiting for child\n"); 48 return 0; 49 } 50 } 51 52 fprintf(stderr, "PASS\n"); 53 54 return 0; 55 } 56
