nptl/tst-fork3.c

   1 /* Copyright (C) 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <pthread.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <sys/wait.h>
  26
  27
  28 static pid_t initial_pid;
  29
  30
  31 static void *
  32 tf2 (void *arg)
  33 {
  34   if (getppid () != initial_pid)
  35     {
  36       printf ("getppid in thread returned %ld, expected %ld\n",
  37               (long int) getppid (), (long int) initial_pid);
  38       return (void *) -1;
  39     }
  40
  41   return NULL;
  42 }
  43
  44
  45 static void *
  46 tf1 (void *arg)
  47 {
  48   pid_t child = fork ();
  49   if (child == 0)
  50     {
  51       if (getppid () != initial_pid)
  52         {
  53           printf ("first getppid returned %ld, expected %ld\n",
  54                   (long int) getppid (), (long int) initial_pid);
  55           exit (1);
  56         }
  57
  58       pthread_t th2;
  59       if (pthread_create (&th2, NULL, tf2, NULL) != 0)
  60         {
  61           puts ("child: pthread_create failed");
  62           exit (1);
  63         }
  64
  65       void *result;
  66       if (pthread_join (th2, &result) != 0)
  67         {
  68           puts ("pthread_join failed");
  69           exit  (1);
  70         }
  71
  72       exit (result == NULL ? 0 : 1);
  73     }
  74   else if (child == -1)
  75     {
  76       puts ("initial fork failed");
  77       exit (1);
  78     }
  79
  80   int status;
  81   if (TEMP_FAILURE_RETRY (waitpid (child, &status, 0)) != child)
  82     {
  83       printf ("waitpid failed: %m\n");
  84       exit (1);
  85     }
  86
  87   exit (status);
  88 }
  89
  90
  91 int
  92 main (void)
  93 {
  94   initial_pid = getpid ();
  95
  96   pthread_t th1;
  97   if (pthread_create (&th1, NULL, tf1, NULL) != 0)
  98     {
  99       puts ("parent: pthread_create failed");
 100       exit (1);
 101     }
 102
 103   /* This call should never return.  */
 104   pthread_join (th1, NULL);
 105
 106   return 1;
 107 }