1  /* Locate the shared object symbol nearest a given address.
       2     Copyright (C) 2003-2023 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