linuxthreads/sysdeps/pthread/errno-loc.c

   1 /* MT support function to get address of `errno' variable, linuxthreads
   2    version.
   3    Copyright (C) 1996, 1998, 2002, 2003, 2004 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <tls.h>
  23 #include <linuxthreads/internals.h>
  24 #include <sysdep-cancel.h>
  25
  26 #if ! USE___THREAD && !RTLD_PRIVATE_ERRNO
  27 #undef errno
  28 extern int errno;
  29 #endif
  30
  31 int *
  32 #if ! USE___THREAD
  33 weak_const_function
  34 #endif
  35 __errno_location (void)
  36 {
  37 #if ! USE___THREAD && !defined NOT_IN_libc
  38   if (! SINGLE_THREAD_P)
  39     {
  40       pthread_descr self = thread_self();
  41       return LIBC_THREAD_GETMEM (self, p_errnop);
  42     }
  43 #endif
  44   return &errno;
  45 }
  46 libc_hidden_def (__errno_location)