errno.h 3.0 KB

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  1. /* Copyright (C) 1991,92,93,94,95,96,97,2002 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, see
  13. <http://www.gnu.org/licenses/>. */
  14. /*
  15. * ISO C99 Standard: 7.5 Errors <errno.h>
  16. */
  17. #ifndef _ERRNO_H
  18. /* The includer defined __need_Emath if he wants only the definitions
  19. of EDOM and ERANGE, and not everything else. */
  20. #ifndef __need_Emath
  21. # define _ERRNO_H 1
  22. # include <features.h>
  23. #endif
  24. __BEGIN_DECLS
  25. /* Get the error number constants from the system-specific file.
  26. This file will test __need_Emath and _ERRNO_H. */
  27. #include <bits/errno.h>
  28. #undef __need_Emath
  29. #ifdef _ERRNO_H
  30. /* Declare the `errno' variable, unless it's defined as a macro by
  31. bits/errno.h. This is the case in GNU, where it is a per-thread
  32. variable. This redeclaration using the macro still works, but it
  33. will be a function declaration without a prototype and may trigger
  34. a -Wstrict-prototypes warning. */
  35. #ifndef errno
  36. extern int errno;
  37. #endif
  38. #ifdef _LIBC
  39. # ifdef __UCLIBC_HAS___PROGNAME__
  40. extern const char *__progname, *__progname_full;
  41. # endif
  42. #endif
  43. #if defined __USE_GNU && defined __UCLIBC_HAS_PROGRAM_INVOCATION_NAME__
  44. /* The full and simple forms of the name with which the program was
  45. invoked. These variables are set up automatically at startup based on
  46. the value of ARGV[0] (this works only if you use GNU ld). */
  47. extern const char *program_invocation_name, *program_invocation_short_name;
  48. #endif /* __USE_GNU */
  49. #endif /* _ERRNO_H */
  50. __END_DECLS
  51. #ifdef _LIBC
  52. #ifdef IS_IN_rtld
  53. # undef errno
  54. # define errno _dl_errno
  55. extern int _dl_errno; /* attribute_hidden */
  56. #elif defined __UCLIBC_HAS_TLS__
  57. # if !defined NOT_IN_libc || defined IS_IN_libpthread
  58. # undef errno
  59. # ifndef NOT_IN_libc
  60. # define errno __libc_errno
  61. # else
  62. # define errno errno /* For #ifndef errno tests. */
  63. # endif
  64. extern __thread int errno attribute_tls_model_ie;
  65. # endif
  66. #endif
  67. #ifndef __set_errno
  68. #define __set_errno(val) (errno = (val))
  69. #endif
  70. #endif /* _LIBC */
  71. #endif /* _ERRNO_H */
  72. /* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so
  73. that printing `error_t' values in the debugger shows the names. We
  74. might need this definition sometimes even if this file was included
  75. before. */
  76. #if defined __USE_GNU || defined __need_error_t
  77. # ifndef __error_t_defined
  78. typedef int error_t;
  79. # define __error_t_defined 1
  80. # endif
  81. # undef __need_error_t
  82. #endif