bits/environments.h

   1 /* Copyright (C) 1999, 2001 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    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    _POSIX_V6_ILP32_OFF32   32bit int, long, pointers, and off_t type
  31    _POSIX_V6_ILP32_OFFBIG  32bit int, long, and pointers and larger off_t type
  32
  33    _POSIX_V6_LP64_OFF32    64bit long and pointers and 32bit off_t type
  34    _POSIX_V6_LPBIG_OFFBIG  64bit long and pointers and large off_t type
  35
  36    The macros _XBS5_ILP32_OFF32, _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and
  37    _XBS5_LPBIG_OFFBIG were used in previous versions of the Unix standard
  38    and are available only for compatibility.
  39 */
  40
  41 #if __WORDSIZE == 64
  42
  43 /* We can never provide environments with 32-bit wide pointers.  */
  44 # define _POSIX_V6_ILP32_OFF32  -1
  45 # define _POSIX_V6_ILP32_OFFBIG -1
  46 # define _XBS5_ILP32_OFF32      -1
  47 # define _XBS5_ILP32_OFFBIG     -1
  48 /* We also have no use (for now) for an environment with bigger pointers
  49    and offsets.  */
  50 # define _POSIX_V6_LPBIG_OFFBIG -1
  51 # define _XBS5_LPBIG_OFFBIG     -1
  52
  53 /* By default we have 64-bit wide `long int', pointers and `off_t'.  */
  54 # define _POSIX_V6_LP64_OFF64   1
  55 # define _XBS5_LP64_OFF64       1
  56
  57 #else /* __WORDSIZE == 32 */
  58
  59 /* By default we have 32-bit wide `int', `long int', pointers and `off_t'
  60    and all platforms support LFS.  */
  61 # define _POSIX_V6_ILP32_OFF32  1
  62 # define _POSIX_V6_ILP32_OFFBIG 1
  63 # define _XBS5_ILP32_OFF32      1
  64 # define _XBS5_ILP32_OFFBIG     1
  65
  66 /* We optionally provide an environment with the above size but an 64-bit
  67    side `off_t'.  Therefore we don't define _XBS5_ILP32_OFFBIG.  */
  68
  69 /* We can never provide environments with 64-bit wide pointers.  */
  70 # define _POSIX_V6_LP64_OFF64   -1
  71 # define _POSIX_V6_LPBIG_OFFBIG -1
  72 # define _XBS5_LP64_OFF64       -1
  73 # define _XBS5_LPBIG_OFFBIG     -1
  74
  75 #endif /* __WORDSIZE == 32 */