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
  23
  24 extern int val;
  25
  26
  27 static void
  28 prepare (void)
  29 {
  30   ++val;
  31 }
  32
  33 static void
  34 parent (void)
  35 {
  36   val *= 4;
  37 }
  38
  39 static void
  40 child (void)
  41 {
  42   val *= 8;
  43 }
  44
  45 static void
  46 __attribute__ ((constructor))
  47 init (void)
  48 {
  49   extern void *__dso_handle;
  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 }