linuxthreads/sysdeps/pthread/res-state.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 <resolv.h>
  20 #include <tls.h>
  21 #include <linuxthreads/internals.h>
  22 #include <sysdep-cancel.h>
  23
  24 #if ! USE___THREAD
  25 # undef _res
  26 extern struct __res_state _res;
  27 #endif
  28
  29 /* When threaded, _res may be a per-thread variable.  */
  30 struct __res_state *
  31 #if ! USE___THREAD
  32 weak_const_function
  33 #endif
  34 __res_state (void)
  35 {
  36 #if ! USE___THREAD
  37   if (! SINGLE_THREAD_P)
  38     {
  39       pthread_descr self = thread_self();
  40       return LIBC_THREAD_GETMEM (self, p_resp);
  41     }
  42   return &_res;
  43 #else
  44   return __resp;
  45 #endif
  46 }
  47 libc_hidden_def (__res_state)