nptl/tst-fork3.c

   1 /* Copyright (C) 2002-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Roland McGrath <roland@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <pthread.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <sys/wait.h>
  25
  26
  27 static pid_t initial_pid;
  28
  29
  30 static void *
  31 tf2 (void *arg)
  32 {
  33   if (getppid () != initial_pid)
  34     {
  35       printf ("getppid in thread returned %ld, expected %ld\n",
  36               (long int) getppid (), (long int) initial_pid);
  37       return (void *) -1;
  38     }
  39
  40   return NULL;
  41 }
  42
  43
  44 static void *
  45 tf1 (void *arg)
  46 {
  47   pid_t child = fork ();
  48   if (child == 0)
  49     {
  50       if (getppid () != initial_pid)
  51         {
  52           printf ("first getppid returned %ld, expected %ld\n",
  53                   (long int) getppid (), (long int) initial_pid);
  54           exit (1);
  55         }
  56
  57       pthread_t th2;
  58       if (pthread_create (&th2, NULL, tf2, NULL) != 0)
  59         {
  60           puts ("child: pthread_create failed");
  61           exit (1);
  62         }
  63
  64       void *result;
  65       if (pthread_join (th2, &result) != 0)
  66         {
  67           puts ("pthread_join failed");
  68           exit  (1);
  69         }
  70
  71       exit (result == NULL ? 0 : 1);
  72     }
  73   else if (child == -1)
  74     {
  75       puts ("initial fork failed");
  76       exit (1);
  77     }
  78
  79   int status;
  80   if (TEMP_FAILURE_RETRY (waitpid (child, &status, 0)) != child)
  81     {
  82       printf ("waitpid failed: %m\n");
  83       exit (1);
  84     }
  85
  86   exit (status);
  87 }
  88
  89
  90 int
  91 main (void)
  92 {
  93   initial_pid = getpid ();
  94
  95   pthread_t th1;
  96   if (pthread_create (&th1, NULL, tf1, NULL) != 0)
  97     {
  98       puts ("parent: pthread_create failed");
  99       exit (1);
 100     }
 101
 102   /* This call should never return.  */
 103   pthread_join (th1, NULL);
 104
 105   return 1;
 106 }