nptl/tst-fork2.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 tf (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 int
  46 main (void)
  47 {
  48   initial_pid = getpid ();
  49
  50   pid_t child = fork ();
  51   if (child == 0)
  52     {
  53       if (getppid () != initial_pid)
  54         {
  55           printf ("first getppid returned %ld, expected %ld\n",
  56                   (long int) getppid (), (long int) initial_pid);
  57           exit (1);
  58         }
  59
  60       pthread_t th;
  61       if (pthread_create (&th, NULL, tf, NULL) != 0)
  62         {
  63           puts ("pthread_create failed");
  64           exit (1);
  65         }
  66
  67       void *result;
  68       if (pthread_join (th, &result) != 0)
  69         {
  70           puts ("pthread_join failed");
  71           exit  (1);
  72         }
  73
  74       exit (result == NULL ? 0 : 1);
  75     }
  76   else if (child == -1)
  77     {
  78       puts ("initial fork failed");
  79       return 1;
  80     }
  81
  82   int status;
  83   if (TEMP_FAILURE_RETRY (waitpid (child, &status, 0)) != child)
  84     {
  85       printf ("waitpid failed: %m\n");
  86       return 1;
  87     }
  88
  89   return status;
  90 }