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glibc  2.9
herrno-loc.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 <netdb.h>
00020 #include <tls.h>
00021 #include <linuxthreads/internals.h>
00022 #include <sysdep-cancel.h>
00023 
00024 #if ! USE___THREAD
00025 # undef h_errno
00026 extern int h_errno;
00027 #endif
00028 
00029 /* When threaded, h_errno may be a per-thread variable.  */
00030 int *
00031 weak_const_function
00032 __h_errno_location (void)
00033 {
00034 #if ! USE___THREAD
00035   if (! SINGLE_THREAD_P)
00036     {
00037       pthread_descr self = thread_self();
00038       return LIBC_THREAD_GETMEM (self, p_h_errnop);
00039     }
00040 #endif
00041   return &h_errno;
00042 }
00043 libc_hidden_def (__h_errno_location)