1  /* Copyright (C) 2001-2023 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 <stdio.h>
      19  #include <stdlib.h>
      20  
      21  int global;
      22  int *ip;
      23  
      24  extern void dummy (void);
      25  extern void foo (void *p);
      26  
      27  void
      28  dummy (void)
      29  {
      30    printf ("This is %s\n", __FUNCTION__);
      31    *ip = global = 1;
      32  }
      33  
      34  
      35  void
      36  foo (void *p)
      37  {
      38    printf ("This is %s\n", __FUNCTION__);
      39    atexit (dummy);
      40    ip = p;
      41  }