csu/errno.c

   1 /* Definition of `errno' variable.  Canonical version.
   2    Copyright (C) 2002-2020 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 <errno.h>
  20 #include <tls.h>
  21 #include <dl-sysdep.h>
  22 #undef errno
  23
  24 #if RTLD_PRIVATE_ERRNO
  25
  26 /* Code compiled for rtld refers only to this name.  */
  27 int rtld_errno attribute_hidden;
  28
  29 #else
  30
  31 __thread int errno;
  32 extern __thread int __libc_errno __attribute__ ((alias ("errno")))
  33   attribute_hidden;
  34
  35 #endif