dlfcn/modatexit.c

   1 /* Copyright (C) 2001-2017 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    <http://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   extern void *__dso_handle __attribute__ ((__weak__));
  39   printf ("This is %s\n", __FUNCTION__);
  40   atexit (dummy);
  41   if (&__dso_handle) puts ("have dso handle"); else puts ("no dso handle");
  42   ip = p;
  43 }