dlfcn/dladdr1.c

   1 /* Locate the shared object symbol nearest a given address.
   2    Copyright (C) 2003-2020 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 <ldsodefs.h>
  21
  22 #if !defined SHARED && IS_IN (libdl)
  23
  24 int
  25 dladdr1 (const void *address, Dl_info *info, void **extra, int flags)
  26 {
  27   return __dladdr1 (address, info, extra, flags);
  28 }
  29
  30 #else
  31
  32 int
  33 __dladdr1 (const void *address, Dl_info *info, void **extra, int flags)
  34 {
  35 # ifdef SHARED
  36   if (!rtld_active ())
  37     return _dlfcn_hook->dladdr1 (address, info, extra, flags);
  38 # endif
  39
  40   switch (flags)
  41     {
  42     default:                    /* Make this an error?  */
  43     case 0:
  44       return _dl_addr (address, info, NULL, NULL);
  45     case RTLD_DL_SYMENT:
  46       return _dl_addr (address, info, NULL, (const ElfW(Sym) **) extra);
  47     case RTLD_DL_LINKMAP:
  48       return _dl_addr (address, info, (struct link_map **) extra, NULL);
  49     }
  50 }
  51 # ifdef SHARED
  52 strong_alias (__dladdr1, dladdr1)
  53 # endif
  54 #endif