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 #if !defined SHARED && defined IS_IN_libdl
  27
  28 void *
  29 dlmopen (Lmid_t nsid, const char *file, int mode)
  30 {
  31   return __dlmopen (nsid, file, mode, RETURN_ADDRESS (0));
  32 }
  33 static_link_warning (dlmopen)
  34
  35 #else
  36
  37 struct dlmopen_args
  38 {
  39   /* Namespace ID.  */
  40   Lmid_t nsid;
  41   /* The arguments for dlopen_doit.  */
  42   const char *file;
  43   int mode;
  44   /* The return value of dlopen_doit.  */
  45   void *new;
  46   /* Address of the caller.  */
  47   const void *caller;
  48 };
  49
  50 static void
  51 dlmopen_doit (void *a)
  52 {
  53   struct dlmopen_args *args = (struct dlmopen_args *) a;
  54
  55   /* Non-shared code has no support for multiple namespaces.  */
  56   if (args->nsid != LM_ID_BASE)
  57 # ifdef SHARED
  58     /* If trying to open the link map for the main executable the namespace
  59        must be the main one.  */
  60     if (args->file == NULL)
  61 # endif
  62       GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid namespace"));
  63
  64   args->new = _dl_open (args->file ?: "", args->mode | __RTLD_DLOPEN,
  65                         args->caller, args->nsid);
  66 }
  67
  68
  69 void *
  70 __dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
  71 {
  72 # ifdef SHARED
  73   if (__builtin_expect (_dlfcn_hook != NULL, 0))
  74     return _dlfcn_hook->dlmopen (nsid, file, mode, RETURN_ADDRESS (0));
  75 # endif
  76
  77   struct dlmopen_args args;
  78   args.nsid = nsid;
  79   args.file = file;
  80   args.mode = mode;
  81   args.caller = DL_CALLER;
  82
  83 # ifdef SHARED
  84   return _dlerror_run (dlmopen_doit, &args) ? NULL : args.new;
  85 # else
  86   if (_dlerror_run (dlmopen_doit, &args))
  87     return NULL;
  88
  89   __libc_register_dl_open_hook ((struct link_map *) args.new);
  90   __libc_register_dlfcn_hook ((struct link_map *) args.new);
  91
  92   return args.new;
  93 # endif
  94 }
  95 # ifdef SHARED
  96 strong_alias (__dlmopen, dlmopen)
  97 # endif
  98 #endif