dlfcn/dlmopen.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 <errno.h>
  22 #include <libintl.h>
  23 #include <stddef.h>
  24 #include <ldsodefs.h>
  25
  26 struct dlmopen_args
  27 {
  28   /* Namespace ID.  */
  29   Lmid_t nsid;
  30   /* The arguments for dlopen_doit.  */
  31   const char *file;
  32   int mode;
  33   /* The return value of dlopen_doit.  */
  34   void *new;
  35   /* Address of the caller.  */
  36   const void *caller;
  37 };
  38
  39 static void
  40 dlmopen_doit (void *a)
  41 {
  42   struct dlmopen_args *args = (struct dlmopen_args *) a;
  43
  44   /* Non-shared code has no support for multiple namespaces.  */
  45   if (args->nsid != LM_ID_BASE)
  46 #ifdef SHARED
  47     /* If trying to open the link map for the main executable the namespace
  48        must be the main one.  */
  49     if (args->file == NULL)
  50 #endif
  51       GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid namespace"));
  52
  53   args->new = _dl_open (args->file ?: "", args->mode | __RTLD_DLOPEN,
  54                         args->caller, args->nsid);
  55 }
  56
  57
  58 void *
  59 dlmopen (Lmid_t nsid, const char *file, int mode)
  60 {
  61   struct dlmopen_args args;
  62   args.nsid = nsid;
  63   args.file = file;
  64   args.mode = mode;
  65   args.caller = RETURN_ADDRESS (0);
  66
  67   return _dlerror_run (dlmopen_doit, &args) ? NULL : args.new;
  68 }
  69 static_link_warning (dlmopen)