elf/linux-compat.c

   1 /* Initializer for Linux-compatible dynamic linker `/lib/ld-linux.so.1'.
   2 Copyright (C) 1995 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
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <link.h>
  21 #include <stdlib.h>
  22
  23 /* This function will be the DT_INIT initializer for the ld-linux.so.1
  24    shared object.  This is called from rtld.c before shlib initializers.
  25
  26    The old Linux ELF startup code expects the dynamic linker to magically
  27    call atexit to arrange for shared object finalizers to run.  (The
  28    ABI-compliant startup code does this itself.)  We build a compatible
  29    version of the dynamic linker to install as /lib/ld-linux.so.1, the
  30    name old Linux ELF binaries use.  */
  31
  32 void
  33 _init (void)
  34 {
  35   const Elf32_Sym *ref = NULL;
  36   Elf32_Addr loadbase = _dl_lookup_symbol ("atexit", &ref, _dl_loaded,
  37                                            "<ld-linux.so.1 initialization>",
  38                                            1);
  39   (*(__typeof (atexit) *) (loadbase + ref->st_value)) (&_dl_fini);
  40 }