drd/tests/threaded-fork.c

   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 }