dlfcn/dlmopen.c

   1 /* Load a shared object at run time.
   2    Copyright (C) 1995-2000,2003,2004,2006 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 <unistd.h>
  25 #include <ldsodefs.h>
  26
  27 #if !defined SHARED && defined IS_IN_libdl
  28
  29 void *
  30 dlmopen (Lmid_t nsid, const char *file, int mode)
  31 {
  32   return __dlmopen (nsid, file, mode, RETURN_ADDRESS (0));
  33 }
  34 static_link_warning (dlmopen)
  35
  36 #else
  37
  38 struct dlmopen_args
  39 {
  40   /* Namespace ID.  */
  41   Lmid_t nsid;
  42   /* The arguments for dlopen_doit.  */
  43   const char *file;
  44   int mode;
  45   /* The return value of dlopen_doit.  */
  46   void *new;
  47   /* Address of the caller.  */
  48   const void *caller;
  49 };
  50
  51 static void
  52 dlmopen_doit (void *a)
  53 {
  54   struct dlmopen_args *args = (struct dlmopen_args *) a;
  55
  56   /* Non-shared code has no support for multiple namespaces.  */
  57   if (args->nsid != LM_ID_BASE)
  58     {
  59 # ifdef SHARED
  60       /* If trying to open the link map for the main executable the namespace
  61          must be the main one.  */
  62       if (args->file == NULL)
  63 # endif
  64         GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid namespace"));
  65
  66       /* It makes no sense to use RTLD_GLOBAL when loading a DSO into
  67          a namespace other than the base namespace.  */
  68       if (__builtin_expect (args->mode & RTLD_GLOBAL, 0))
  69         GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid mode"));
  70     }
  71
  72   args->new = GLRO(dl_open) (args->file ?: "", args->mode | __RTLD_DLOPEN,
  73                              args->caller,
  74                              args->nsid, __dlfcn_argc, __dlfcn_argv,
  75                              __environ);
  76 }
  77
  78
  79 void *
  80 __dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
  81 {
  82 # ifdef SHARED
  83   if (__builtin_expect (_dlfcn_hook != NULL, 0))
  84     return _dlfcn_hook->dlmopen (nsid, file, mode, RETURN_ADDRESS (0));
  85 # endif
  86
  87   struct dlmopen_args args;
  88   args.nsid = nsid;
  89   args.file = file;
  90   args.mode = mode;
  91   args.caller = DL_CALLER;
  92
  93 # ifdef SHARED
  94   return _dlerror_run (dlmopen_doit, &args) ? NULL : args.new;
  95 # else
  96   if (_dlerror_run (dlmopen_doit, &args))
  97     return NULL;
  98
  99   __libc_register_dl_open_hook ((struct link_map *) args.new);
 100   __libc_register_dlfcn_hook ((struct link_map *) args.new);
 101
 102   return args.new;
 103 # endif
 104 }
 105 # ifdef SHARED
 106 strong_alias (__dlmopen, dlmopen)
 107 # endif
 108 #endif