sysdeps/pthread/tst-atfork1.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 int val;
  27
  28
  29 static void
  30 prepare1 (void)
  31 {
  32   val *= 2;
  33 }
  34
  35 static void
  36 prepare2 (void)
  37 {
  38   ++val;
  39 }
  40
  41 static void
  42 parent1 (void)
  43 {
  44   val += 4;
  45 }
  46
  47 static void
  48 parent2 (void)
  49 {
  50   val *= 4;
  51 }
  52
  53 static void
  54 child1 (void)
  55 {
  56   val += 8;
  57 }
  58
  59 static void
  60 child2 (void)
  61 {
  62   val *= 8;
  63 }
  64
  65
  66 static int
  67 do_test (void)
  68 {
  69   pid_t pid;
  70   int status = 0;
  71
  72   if (pthread_atfork (prepare1, parent1, child1) != 0)
  73     {
  74       puts ("1st atfork failed");
  75       exit (1);
  76     }
  77   if (pthread_atfork (prepare2, parent2, child2) != 0)
  78     {
  79       puts ("2nd atfork failed");
  80       exit (1);
  81     }
  82
  83   pid = fork ();
  84   if (pid == -1)
  85     {
  86       puts ("fork failed");
  87       exit (1);
  88     }
  89
  90   if (pid != 0)
  91     {
  92       /* Parent.  */
  93       if (val != 24)
  94         {
  95           printf ("expected val=%d, got %d\n", 24, val);
  96           exit (1);
  97         }
  98
  99       if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 100         {
 101           puts ("waitpid failed");
 102           exit (1);
 103         }
 104     }
 105   else
 106     {
 107       /* Child.  */
 108       if (val != 80)
 109         {
 110           printf ("expected val=%d, got %d\n", 80, val);
 111           exit (2);
 112         }
 113     }
 114
 115   return status;
 116 }
 117
 118 #define TEST_FUNCTION do_test ()
 119 #include "../test-skeleton.c"