inet/herrno.c

   1 /* Copyright (C) 1996,97,98,2002,2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <features.h>
  20 #include <netdb.h>
  21 #undef h_errno
  22
  23 #include <tls.h>
  24
  25 /* We need to have the error status variable of the resolver
  26    accessible in the libc.  */
  27
  28 #if USE___THREAD
  29 __thread int h_errno;
  30 extern __thread int __libc_h_errno __attribute__ ((alias ("h_errno")))
  31   attribute_hidden;
  32 # define h_errno __libc_h_errno
  33 #else
  34 /* This differs from plain `int h_errno;' in that it doesn't create
  35    a common definition, but a plain symbol that resides in .bss,
  36    which can have an alias.  */
  37 int h_errno __attribute__((section (".bss")));
  38 weak_alias (h_errno, _h_errno)
  39
  40 /* We declare these with compat_symbol so that they are not
  41    visible at link time.  Programs must use the accessor functions.  */
  42 # if defined HAVE_ELF && defined SHARED && defined DO_VERSIONING
  43 #  include <shlib-compat.h>
  44 compat_symbol (libc, h_errno, h_errno, GLIBC_2_0);
  45 compat_symbol (libc, _h_errno, _h_errno, GLIBC_2_0);
  46 # endif
  47 #endif