nptl/tst-atfork2mod.c

   1 /* Copyright (C) 2003-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   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 <pthread.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <dso_handle.h>
  23
  24
  25 extern int val;
  26
  27
  28 static void
  29 prepare (void)
  30 {
  31   ++val;
  32 }
  33
  34 static void
  35 parent (void)
  36 {
  37   val *= 4;
  38 }
  39
  40 static void
  41 child (void)
  42 {
  43   val *= 8;
  44 }
  45
  46 static void
  47 __attribute__ ((constructor))
  48 init (void)
  49 {
  50   printf ("dsohandle = %p\n", __dso_handle);
  51
  52   if (pthread_atfork (prepare, parent, child) != 0)
  53     {
  54       puts ("init: atfork failed");
  55       exit (1);
  56     }
  57 }