dlfcn/dlopenold.c

   1 /* Load a shared object at run time.
   2    Copyright (C) 1995-1999, 2000, 2004 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <dlfcn.h>
  21 #include <stddef.h>
  22 #include <unistd.h>
  23 #include <ldsodefs.h>
  24
  25 /* This file is for compatibility with glibc 2.0.  Compile it only if
  26    versioning is used.  */
  27 #include <shlib-compat.h>
  28 #if SHLIB_COMPAT (libdl, GLIBC_2_0, GLIBC_2_1)
  29
  30 struct dlopen_args
  31 {
  32   /* The arguments for dlopen_doit.  */
  33   const char *file;
  34   int mode;
  35   /* The return value of dlopen_doit.  */
  36   void *new;
  37   /* Address of the caller.  */
  38   const void *caller;
  39 };
  40
  41
  42 /* Non-shared code has no support for multiple namespaces.  */
  43 #ifdef SHARED
  44 # define NS __LM_ID_CALLER
  45 #else
  46 # define NS LM_ID_BASE
  47 #endif
  48
  49
  50 static void
  51 dlopen_doit (void *a)
  52 {
  53   struct dlopen_args *args = (struct dlopen_args *) a;
  54
  55   args->new = GLRO(dl_open) (args->file ?: "", args->mode | __RTLD_DLOPEN,
  56                              args->caller,
  57                              args->file == NULL ? LM_ID_BASE : NS,
  58                              __dlfcn_argc, __dlfcn_argv, __environ);
  59 }
  60
  61 extern void *__dlopen_nocheck (const char *file, int mode);
  62 void *
  63 __dlopen_nocheck (const char *file, int mode)
  64 {
  65   struct dlopen_args args;
  66   args.file = file;
  67   args.caller = RETURN_ADDRESS (0);
  68
  69   if ((mode & RTLD_BINDING_MASK) == 0)
  70     /* By default assume RTLD_LAZY.  */
  71     mode |= RTLD_LAZY;
  72   args.mode = mode;
  73
  74   if (__builtin_expect (_dlfcn_hook != NULL, 0))
  75     return _dlfcn_hook->dlopen (file, mode, RETURN_ADDRESS (0));
  76
  77   return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;
  78 }
  79 compat_symbol (libdl, __dlopen_nocheck, dlopen, GLIBC_2_0);
  80 #endif