dlfcn/dlopen.c

   1 /* Load a shared object at run time.
   2    Copyright (C) 1995,96,97,98,99,2000,2003,2004 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
  23 struct dlopen_args
  24 {
  25   /* The arguments for dlopen_doit.  */
  26   const char *file;
  27   int mode;
  28   /* The return value of dlopen_doit.  */
  29   void *new;
  30   /* Address of the caller.  */
  31   const void *caller;
  32 };
  33
  34
  35 /* Non-shared code has no support for multiple namespaces.  */
  36 #ifdef SHARED
  37 # define NS __LM_ID_CALLER
  38 #else
  39 # define NS LM_ID_BASE
  40 #endif
  41
  42
  43 static void
  44 dlopen_doit (void *a)
  45 {
  46   struct dlopen_args *args = (struct dlopen_args *) a;
  47
  48   args->new = _dl_open (args->file ?: "", args->mode | __RTLD_DLOPEN,
  49                         args->caller, args->file == NULL ? LM_ID_BASE : NS);
  50 }
  51
  52
  53 extern void *__dlopen_check (const char *file, int mode);
  54 void *
  55 __dlopen_check (const char *file, int mode)
  56 {
  57   struct dlopen_args args;
  58   args.file = file;
  59   args.mode = mode;
  60   args.caller = RETURN_ADDRESS (0);
  61
  62   return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;
  63 }
  64 #include <shlib-compat.h>
  65 versioned_symbol (libdl, __dlopen_check, dlopen, GLIBC_2_1);
  66 static_link_warning (dlopen)