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glibc  2.9
herrno.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 <features.h>
00020 #include <netdb.h>
00021 #undef h_errno
00022 
00023 #include <tls.h>
00024 
00025 /* We need to have the error status variable of the resolver
00026    accessible in the libc.  */
00027 
00028 #if USE___THREAD
00029 __thread int h_errno;
00030 extern __thread int __libc_h_errno __attribute__ ((alias ("h_errno")))
00031   attribute_hidden;
00032 # define h_errno __libc_h_errno
00033 #else
00034 /* This differs from plain `int h_errno;' in that it doesn't create
00035    a common definition, but a plain symbol that resides in .bss,
00036    which can have an alias.  */
00037 int h_errno __attribute__((section (".bss")));
00038 weak_alias (h_errno, _h_errno)
00039 
00040 /* We declare these with compat_symbol so that they are not
00041    visible at link time.  Programs must use the accessor functions.  */
00042 # if defined HAVE_ELF && defined SHARED && defined DO_VERSIONING
00043 #  include <shlib-compat.h>
00044 compat_symbol (libc, h_errno, h_errno, GLIBC_2_0);
00045 compat_symbol (libc, _h_errno, _h_errno, GLIBC_2_0);
00046 # endif
00047 #endif