elf/dl-fini.c

   1 /* Call the termination functions of loaded shared objects.
   2    Copyright (C) 1995, 1996, 1998, 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <elf/ldsodefs.h>
  21
  22 void
  23 internal_function
  24 _dl_fini (void)
  25 {
  26   struct link_map *l;
  27
  28   for (l = _dl_loaded; l; l = l->l_next)
  29     if (l->l_init_called)
  30       {
  31         int first = 1;
  32
  33         /* Make sure nothing happens if we are called twice.  */
  34         l->l_init_called = 0;
  35
  36         /* Don't call the destructors for objects we are not supposed to.  */
  37         if (l->l_name[0] == '\0' && l->l_type == lt_executable)
  38           continue;
  39
  40         /* First see whether an array is given.  */
  41         if (l->l_info[DT_FINI_ARRAY] != NULL)
  42           {
  43             ElfW(Addr) *array =
  44               (ElfW(Addr) *) (l->l_addr
  45                               + l->l_info[DT_FINI_ARRAY]->d_un.d_ptr);
  46             unsigned int sz = (l->l_info[DT_FINI_ARRAYSZ]->d_un.d_val
  47                                / sizeof (ElfW(Addr)));
  48             unsigned int cnt;
  49
  50             for (cnt = 0; cnt < sz; ++cnt)
  51               {
  52                 /* When debugging print a message first.  */
  53                 if (_dl_debug_impcalls && first)
  54                   _dl_debug_message (1, "\ncalling fini: ",
  55                                      l->l_name[0] ? l->l_name : _dl_argv[0],
  56                                      "\n\n", NULL);
  57                 first = 0;
  58
  59                 (*(void (*) (void)) (l->l_addr + array[cnt])) ();
  60               }
  61           }
  62
  63         /* Next try the old-style destructor.  */
  64         if (l->l_info[DT_FINI])
  65           {
  66             /* When debugging print a message first.  */
  67             if (_dl_debug_impcalls && first)
  68               _dl_debug_message (1, "\ncalling fini: ",
  69                                  l->l_name[0] ? l->l_name : _dl_argv[0],
  70                                  "\n\n", NULL);
  71
  72             (*(void (*) (void)) (l->l_addr + l->l_info[DT_FINI]->d_un.d_ptr)) ();
  73           }
  74       }
  75 }