1  /* Copyright (C) 2003-2023 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 <pthread.h>
      19  #include <stdio.h>
      20  #include <stdlib.h>
      21  #include <dso_handle.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    printf ("dsohandle = %p\n", __dso_handle);
      50  
      51    if (pthread_atfork (prepare, parent, child) != 0)
      52      {
      53        puts ("init: atfork failed");
      54        exit (1);
      55      }
      56  }