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glibc  2.9
res-state.c
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00001 /* Copyright (C) 1996, 97, 98, 2002, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <resolv.h>
00020 #include <tls.h>
00021 #include <linuxthreads/internals.h>
00022 #include <sysdep-cancel.h>
00023 
00024 #if ! USE___THREAD
00025 # undef _res
00026 extern struct __res_state _res;
00027 #endif
00028 
00029 /* When threaded, _res may be a per-thread variable.  */
00030 struct __res_state *
00031 #if ! USE___THREAD
00032 weak_const_function
00033 #endif
00034 __res_state (void)
00035 {
00036 #if ! USE___THREAD
00037   if (! SINGLE_THREAD_P)
00038     {
00039       pthread_descr self = thread_self();
00040       return LIBC_THREAD_GETMEM (self, p_resp);
00041     }
00042   return &_res;
00043 #else
00044   return __resp;
00045 #endif
00046 }
00047 libc_hidden_def (__res_state)