dlfcn/dladdr1.c

   1 /* Locate the shared object symbol nearest a given address.
   2    Copyright (C) 2003-2022 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 #include <shlib-compat.h>
  22
  23 int
  24 __dladdr1 (const void *address, Dl_info *info, void **extra, int flags)
  25 {
  26 #ifdef SHARED
  27   if (GLRO (dl_dlfcn_hook) != NULL)
  28     return GLRO (dl_dlfcn_hook)->dladdr1 (address, info, extra, flags);
  29 #endif
  30
  31   switch (flags)
  32     {
  33     default:                    /* Make this an error?  */
  34     case 0:
  35       return _dl_addr (address, info, NULL, NULL);
  36     case RTLD_DL_SYMENT:
  37       return _dl_addr (address, info, NULL, (const ElfW(Sym) **) extra);
  38     case RTLD_DL_LINKMAP:
  39       return _dl_addr (address, info, (struct link_map **) extra, NULL);
  40     }
  41 }
  42 versioned_symbol (libc, __dladdr1, dladdr1, GLIBC_2_34);
  43
  44 #if OTHER_SHLIB_COMPAT  (libdl, GLIBC_2_3_3, GLIBC_2_34)
  45 compat_symbol (libdl, __dladdr1, dladdr1, GLIBC_2_3_3);
  46 #endif