bits/environments.h

   1 /* Copyright (C) 1999 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _UNISTD_H
  20 # error "Never include this file directly.  Use <unistd.h> instead"
  21 #endif
  22
  23 #include <bits/wordsize.h>
  24
  25 /* This header should define the following symbols under the described
  26    situations.  A value `1' means that the model is always supported,
  27    `-1' means it is never supported.  Undefined means it cannot be
  28    statically decided.
  29
  30    _XBS5_ILP32_OFF32    32bit int, long, pointers, and off_t type
  31    _XBS5_ILP32_OFFBIG   32bit int, long, and pointers and larger off_t type
  32
  33    _XBS5_LP64_OFF32     64bit long and pointers and 32bit off_t type
  34    _XBS5_LPBIG_OFFBIG   64bit long and pointers and large off_t type
  35 */
  36
  37 #if __WORDSIZE == 64
  38
  39 /* We can never provide environments with 32-bit wide pointers.  */
  40 # define _XBS5_ILP32_OFF32      -1
  41 # define _XBS5_ILP32_OFFBIG     -1
  42
  43 /* By default we have 64-bit wide `long int', pointers and `off_t'.  */
  44 # define _XBS5_LP64_OFF32       1
  45 # define _XBS5_LPBIG_OFFBIG     1
  46
  47 #else /* __WORDSIZE == 32 */
  48
  49 /* By default we have 32-bit wide `int', `long int', pointers and `off_t'.  */
  50 # define _XBS5_ILP32_OFF32      1
  51
  52 /* We optionally provide an environment with the above size but an 64-bit
  53    side `off_t'.  Therefore we don't define _XBS5_ILP32_OFFBIG.  */
  54
  55 /* We can never provide environments with 64-bit wide pointers.  */
  56 # define _XBS5_LP64_OFF64       -1
  57 # define _XBS5_LPBIG_OFFBIG     -1
  58
  59 #endif /* __WORDSIZE == 32 */