dlfcn/dlinfo.c

   1 /* dlinfo -- Get information from the dynamic linker.
   2    Copyright (C) 2003 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 <link.h>
  22 #include <ldsodefs.h>
  23 #include <libintl.h>
  24
  25 struct dlinfo_args
  26 {
  27   ElfW(Addr) caller;
  28   void *handle;
  29   int request;
  30   void *arg;
  31 };
  32
  33 static void
  34 dlinfo_doit (void *argsblock)
  35 {
  36   struct dlinfo_args *const args = argsblock;
  37   struct link_map *l = args->handle;
  38
  39 #if 0
  40   if (args->handle == RTLD_SELF)
  41     {
  42
  43       /* Find the highest-addressed object that CALLER is not below.  */
  44       for (l = GL(dl_loaded); l != NULL; l = l->l_next)
  45         if (caller >= l->l_map_start && caller < l->l_map_end)
  46           /* There must be exactly one DSO for the range of the virtual
  47              memory.  Otherwise something is really broken.  */
  48           break;
  49
  50       if (l == NULL)
  51         _dl_signal_error (0, NULL, NULL, N_("\
  52 RTLD_SELF used in code not dynamically loaded"));
  53     }
  54 #endif
  55
  56   switch (args->request)
  57     {
  58     case RTLD_DI_LMID:
  59     case RTLD_DI_CONFIGADDR:
  60     default:
  61       _dl_signal_error (0, NULL, NULL, N_("unsupported dlinfo request"));
  62       break;
  63
  64     case RTLD_DI_LINKMAP:
  65       *(struct link_map **) args->arg = l;
  66       break;
  67
  68     case RTLD_DI_SERINFO:
  69       _dl_rtld_di_serinfo (l, args->arg, false);
  70       break;
  71     case RTLD_DI_SERINFOSIZE:
  72       _dl_rtld_di_serinfo (l, args->arg, true);
  73       break;
  74
  75     case RTLD_DI_ORIGIN:
  76       strcpy (args->arg, l->l_origin);
  77       break;
  78     }
  79 }
  80
  81 int
  82 dlinfo (void *handle, int request, void *arg)
  83 {
  84   struct dlinfo_args args = { (ElfW(Addr)) RETURN_ADDRESS (0),
  85                               handle, request, arg };
  86   return _dlerror_run (&dlinfo_doit, &args) ? -1 : 0;
  87 }