regress/lib/libpthread/fork/fork.c

   1 /*      $NetBSD: fork.c,v 1.2 2003/04/11 12:56:25 lha Exp $     */
   2
   3 /*
   4  * Check that child process doesn't get threads, also make sure sleep
   5  * works in child.
   6  *
   7  * Written by Love Hörnquist Åstrand <lha@NetBSD.org>, March 2003.
   8  * Public domain.
   9  */
  10
  11 #include <sys/types.h>
  12 #include <sys/wait.h>
  13
  14 #include <err.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <signal.h>
  18 #include <pthread.h>
  19 #include <unistd.h>
  20
  21 static pid_t parent;
  22 static int thread_survived = 0;
  23
  24 static void *
  25 print_pid(void *arg)
  26 {
  27         sleep(3);
  28
  29         thread_survived = 1;
  30         if (parent != getpid()) {
  31                 kill(parent, SIGKILL);
  32                 errx(1, "child thread running");
  33         }
  34         return NULL;
  35 }
  36
  37 int
  38 main(int argc, char **argv)
  39 {
  40         pthread_t p;
  41         pid_t fork_pid;
  42         int ret;
  43
  44         parent = getpid();
  45
  46         pthread_create(&p, NULL, print_pid, NULL);
  47
  48         fork_pid = fork();
  49         if (fork_pid == -1)
  50                 err(1, "fork failed");
  51
  52         if (fork_pid) {
  53                 ret = pthread_join(p, NULL);
  54                 if (ret && fork_pid != 0)
  55                         errx(1, "join failed in parent");
  56
  57                 if (!thread_survived)
  58                         errx(1, "child_thread did NOT survive");
  59
  60                 if (fork_pid != 0) {
  61                         int status;
  62                         waitpid(fork_pid, &status, 0);
  63                         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
  64                                 errx(1, "child died wrongly");
  65                 }
  66         } else {
  67                 sleep(5);
  68
  69                 if (thread_survived) {
  70                         kill(parent, SIGKILL);
  71                         errx(1, "child_thread survived");
  72                 }
  73         }
  74
  75         return 0;
  76 }