dlfcn/dlopen.c

   1 /* Load a shared object at run time.
   2    Copyright (C) 1995, 1996, 1997, 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 <dlfcn.h>
  21
  22 struct dlopen_args
  23 {
  24   /* The arguments for dlopen_doit.  */
  25   const char *file;
  26   int mode;
  27   /* The return value of dlopen_doit.  */
  28   void *new;
  29   /* Address of the caller.  */
  30   const void *caller;
  31 };
  32
  33 static void
  34 dlopen_doit (void *a)
  35 {
  36   struct dlopen_args *args = (struct dlopen_args *) a;
  37
  38   args->new = _dl_open (args->file ?: "", args->mode, args->caller);
  39 }
  40
  41
  42 void *
  43 __dlopen_check (const char *file, int mode)
  44 {
  45   struct dlopen_args args;
  46   args.file = file;
  47   args.mode = mode;
  48   args.caller = __builtin_return_address (0);
  49
  50   return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;
  51 }
  52 #if defined PIC && defined DO_VERSIONING
  53 default_symbol_version (__dlopen_check, dlopen, GLIBC_2.1);
  54 #else
  55 weak_alias (__dlopen_check, dlopen)
  56 #endif