1: /* Load a shared object at run time.
    2:    Copyright (C) 1995-2000,2003,2004,2005 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 <libintl.h>
   22: #include <stddef.h>
   23: #include <unistd.h>
   24: #include <ldsodefs.h>
   25: 
   26: #if !defined SHARED && defined IS_IN_libdl
   27: 
   28: void *
   29: dlopen (const char *file, int mode)
   30: {
   31:   return __dlopen (file, mode, RETURN_ADDRESS (0));
   32: }
   33: static_link_warning (dlopen)
   34: 
   35: #else
   36: 
   37: struct dlopen_args
   38: {
   39:   /* The arguments for dlopen_doit.  */
   40:   const char *file;
   41:   int mode;
   42:   /* The return value of dlopen_doit.  */
   43:   void *new;
   44:   /* Address of the caller.  */
   45:   const void *caller;
   46: };
   47: 
   48: 
   49: /* Non-shared code has no support for multiple namespaces.  */
   50: # ifdef SHARED
   51: #  define NS __LM_ID_CALLER
   52: # else
   53: #  define NS LM_ID_BASE
   54: # endif
   55: 
   56: 
   57: static void
   58: dlopen_doit (void *a)
   59: {
   60:   struct dlopen_args *args = (struct dlopen_args *) a;
   61: 
   62:   if (args->mode & ~(RTLD_BINDING_MASK | RTLD_NOLOAD | RTLD_DEEPBIND
   63:                      | RTLD_GLOBAL | RTLD_LOCAL | RTLD_NODELETE))
   64:     GLRO(dl_signal_error) (0, NULL, NULL, _("invalid mode parameter"));
   65: 
   66:   args->new = GLRO(dl_open) (args->file ?: "", args->mode | __RTLD_DLOPEN,
   67:                              args->caller,
   68:                              args->file == NULL ? LM_ID_BASE : NS,
   69:                              __dlfcn_argc, __dlfcn_argv, __environ);
   70: }
   71: 
   72: 
   73: void *
   74: __dlopen (const char *file, int mode DL_CALLER_DECL)
   75: {
   76: # ifdef SHARED
   77:   if (__builtin_expect (_dlfcn_hook != NULL, 0))
   78:     return _dlfcn_hook->dlopen (file, mode, DL_CALLER);
   79: # endif
   80: 
   81:   struct dlopen_args args;
   82:   args.file = file;
   83:   args.mode = mode;
   84:   args.caller = DL_CALLER;
   85: 
   86: # ifdef SHARED
   87:   return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;
   88: # else
   89:   if (_dlerror_run (dlopen_doit, &args))
   90:     return NULL;
   91: 
   92:   __libc_register_dl_open_hook ((struct link_map *) args.new);
   93:   __libc_register_dlfcn_hook ((struct link_map *) args.new);
   94: 
   95:   return args.new;
   96: # endif
   97: }
   98: # ifdef SHARED
   99: #  include <shlib-compat.h>
  100: strong_alias (__dlopen, __dlopen_check)
  101: versioned_symbol (libdl, __dlopen_check, dlopen, GLIBC_2_1);
  102: # endif
  103: #endif