dlfcn/libc_dlerror_result.c

   1 /* Thread-local variable holding the dlerror result.
   2    Copyright (C) 2021-2023 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <dlerror.h>
  20
  21 /* This pointer is either NULL, dl_action_result_malloc_failed (), or
  22    has been allocated using malloc by the namespace that also contains
  23    this instance of the thread-local variable.  */
  24 __thread struct dl_action_result *__libc_dlerror_result attribute_tls_model_ie;
  25
  26 /* Called during thread shutdown to free resources.  */
  27 void
  28 __libc_dlerror_result_free (void)
  29 {
  30   if (__libc_dlerror_result != NULL)
  31     {
  32       if (__libc_dlerror_result != dl_action_result_malloc_failed)
  33         {
  34           dl_action_result_errstring_free (__libc_dlerror_result);
  35           free (__libc_dlerror_result);
  36         }
  37       __libc_dlerror_result = NULL;
  38     }
  39 }