sysdeps/pthread/tst-fork3.c

   1 /* Copyright (C) 2002-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <pthread.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <sys/wait.h>
  24
  25
  26 static pid_t initial_pid;
  27
  28
  29 static void *
  30 tf2 (void *arg)
  31 {
  32   if (getppid () != initial_pid)
  33     {
  34       printf ("getppid in thread returned %ld, expected %ld\n",
  35               (long int) getppid (), (long int) initial_pid);
  36       return (void *) -1;
  37     }
  38
  39   return NULL;
  40 }
  41
  42
  43 static void *
  44 tf1 (void *arg)
  45 {
  46   pid_t child = fork ();
  47   if (child == 0)
  48     {
  49       if (getppid () != initial_pid)
  50         {
  51           printf ("first getppid returned %ld, expected %ld\n",
  52                   (long int) getppid (), (long int) initial_pid);
  53           exit (1);
  54         }
  55
  56       pthread_t th2;
  57       if (pthread_create (&th2, NULL, tf2, NULL) != 0)
  58         {
  59           puts ("child: pthread_create failed");
  60           exit (1);
  61         }
  62
  63       void *result;
  64       if (pthread_join (th2, &result) != 0)
  65         {
  66           puts ("pthread_join failed");
  67           exit  (1);
  68         }
  69
  70       exit (result == NULL ? 0 : 1);
  71     }
  72   else if (child == -1)
  73     {
  74       puts ("initial fork failed");
  75       exit (1);
  76     }
  77
  78   int status;
  79   if (TEMP_FAILURE_RETRY (waitpid (child, &status, 0)) != child)
  80     {
  81       printf ("waitpid failed: %m\n");
  82       exit (1);
  83     }
  84
  85   exit (status);
  86 }
  87
  88
  89 static int
  90 do_test (void)
  91 {
  92   initial_pid = getpid ();
  93
  94   pthread_t th1;
  95   if (pthread_create (&th1, NULL, tf1, NULL) != 0)
  96     {
  97       puts ("parent: pthread_create failed");
  98       exit (1);
  99     }
 100
 101   /* This call should never return.  */
 102   pthread_join (th1, NULL);
 103
 104   return 1;
 105 }
 106
 107 #include <support/test-driver.c>