errno.h 2.1 KB

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  1. /* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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. /*
  16. * ISO C99 Standard: 7.5 Errors <errno.h>
  17. */
  18. #ifndef _ERRNO_H
  19. /* The includer defined __need_Emath if he wants only the definitions
  20. of EDOM and ERANGE, and not everything else. */
  21. #ifndef __need_Emath
  22. #define _ERRNO_H 1
  23. #include <features.h>
  24. #endif
  25. __BEGIN_DECLS
  26. /* Get the error number constants from the system-specific file.
  27. This file will test __need_Emath and _ERRNO_H. */
  28. #include <bits/errno.h>
  29. #undef __need_Emath
  30. #ifdef _ERRNO_H
  31. /* Declare the `errno' variable, unless it's defined as a macro by
  32. bits/errno.h. This is the case in GNU, where it is a per-thread
  33. variable. This redeclaration using the macro still works, but it
  34. will be a function declaration without a prototype and may trigger
  35. a -Wstrict-prototypes warning. */
  36. #ifndef errno
  37. extern int errno;
  38. #endif
  39. #endif /* _ERRNO_H */
  40. __END_DECLS
  41. #endif /* _ERRNO_H */
  42. /* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so
  43. that printing `error_t' values in the debugger shows the names. We
  44. might need this definition sometimes even if this file was included
  45. before. */
  46. #if defined __USE_GNU || defined __need_error_t
  47. # ifndef __error_t_defined
  48. typedef int error_t;
  49. # define __error_t_defined 1
  50. # endif
  51. # undef __need_error_t
  52. #endif