dlfcn/dlinfo.c

   1 /* dlinfo -- Get information from the dynamic linker.
   2    Copyright (C) 2003-2021 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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <dlfcn.h>
  20 #include <link.h>
  21 #include <ldsodefs.h>
  22 #include <libintl.h>
  23
  24 #if !defined SHARED && IS_IN (libdl)
  25
  26 int
  27 dlinfo (void *handle, int request, void *arg)
  28 {
  29   return __dlinfo (handle, request, arg);
  30 }
  31
  32 #else
  33
  34 # include <dl-tls.h>
  35
  36 struct dlinfo_args
  37 {
  38   void *handle;
  39   int request;
  40   void *arg;
  41 };
  42
  43 static void
  44 dlinfo_doit (void *argsblock)
  45 {
  46   struct dlinfo_args *const args = argsblock;
  47   struct link_map *l = args->handle;
  48
  49   switch (args->request)
  50     {
  51     case RTLD_DI_CONFIGADDR:
  52     default:
  53       _dl_signal_error (0, NULL, NULL, N_("unsupported dlinfo request"));
  54       break;
  55
  56     case RTLD_DI_LMID:
  57       *(Lmid_t *) args->arg = l->l_ns;
  58       break;
  59
  60     case RTLD_DI_LINKMAP:
  61       *(struct link_map **) args->arg = l;
  62       break;
  63
  64     case RTLD_DI_SERINFO:
  65       _dl_rtld_di_serinfo (l, args->arg, false);
  66       break;
  67     case RTLD_DI_SERINFOSIZE:
  68       _dl_rtld_di_serinfo (l, args->arg, true);
  69       break;
  70
  71     case RTLD_DI_ORIGIN:
  72       strcpy (args->arg, l->l_origin);
  73       break;
  74
  75     case RTLD_DI_TLS_MODID:
  76       *(size_t *) args->arg = 0;
  77       *(size_t *) args->arg = l->l_tls_modid;
  78       break;
  79
  80     case RTLD_DI_TLS_DATA:
  81       {
  82         void *data = NULL;
  83         if (l->l_tls_modid != 0)
  84           data = GLRO(dl_tls_get_addr_soft) (l);
  85         *(void **) args->arg = data;
  86         break;
  87       }
  88     }
  89 }
  90
  91 int
  92 __dlinfo (void *handle, int request, void *arg)
  93 {
  94 # ifdef SHARED
  95   if (!rtld_active ())
  96     return _dlfcn_hook->dlinfo (handle, request, arg);
  97 # endif
  98
  99   struct dlinfo_args args = { handle, request, arg };
 100   return _dlerror_run (&dlinfo_doit, &args) ? -1 : 0;
 101 }
 102 # ifdef SHARED
 103 strong_alias (__dlinfo, dlinfo)
 104 # endif
 105 #endif