environments.h 2.8 KB

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  1. /* Copyright (C) 1999, 2001 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #ifndef _UNISTD_H
  16. # error "Never include this file directly. Use <unistd.h> instead"
  17. #endif
  18. #include <bits/wordsize.h>
  19. /* This header should define the following symbols under the described
  20. situations. A value `1' means that the model is always supported,
  21. `-1' means it is never supported. Undefined means it cannot be
  22. statically decided.
  23. _POSIX_V6_ILP32_OFF32 32bit int, long, pointers, and off_t type
  24. _POSIX_V6_ILP32_OFFBIG 32bit int, long, and pointers and larger off_t type
  25. _POSIX_V6_LP64_OFF32 64bit long and pointers and 32bit off_t type
  26. _POSIX_V6_LPBIG_OFFBIG 64bit long and pointers and large off_t type
  27. The macros _XBS5_ILP32_OFF32, _XBS5_ILP32_OFFBIG, _XBS5_LP64_OFF32, and
  28. _XBS5_LPBIG_OFFBIG were used in previous versions of the Unix standard
  29. and are available only for compatibility.
  30. */
  31. #if __WORDSIZE == 64
  32. /* We can never provide environments with 32-bit wide pointers. */
  33. # define _POSIX_V6_ILP32_OFF32 -1
  34. # define _POSIX_V6_ILP32_OFFBIG -1
  35. # define _XBS5_ILP32_OFF32 -1
  36. # define _XBS5_ILP32_OFFBIG -1
  37. /* We also have no use (for now) for an environment with bigger pointers
  38. and offsets. */
  39. # define _POSIX_V6_LPBIG_OFFBIG -1
  40. # define _XBS5_LPBIG_OFFBIG -1
  41. /* By default we have 64-bit wide `long int', pointers and `off_t'. */
  42. # define _POSIX_V6_LP64_OFF64 1
  43. # define _XBS5_LP64_OFF64 1
  44. #else /* __WORDSIZE == 32 */
  45. /* By default we have 32-bit wide `int', `long int', pointers and `off_t'
  46. and all platforms support LFS. */
  47. # define _POSIX_V6_ILP32_OFF32 1
  48. # define _POSIX_V6_ILP32_OFFBIG 1
  49. # define _XBS5_ILP32_OFF32 1
  50. # define _XBS5_ILP32_OFFBIG 1
  51. /* We optionally provide an environment with the above size but an 64-bit
  52. side `off_t'. Therefore we don't define _XBS5_ILP32_OFFBIG. */
  53. /* We can never provide environments with 64-bit wide pointers. */
  54. # define _POSIX_V6_LP64_OFF64 -1
  55. # define _POSIX_V6_LPBIG_OFFBIG -1
  56. # define _XBS5_LP64_OFF64 -1
  57. # define _XBS5_LPBIG_OFFBIG -1
  58. #endif /* __WORDSIZE == 32 */