errno.h 2.9 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495
  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, 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. #if defined __USE_GNU && defined __UCLIBC_HAS_PROGRAM_INVOCATION_NAME__
  40. /* The full and simple forms of the name with which the program was
  41. invoked. These variables are set up automatically at startup based on
  42. the value of ARGV[0] (this works only if you use GNU ld). */
  43. extern const char *program_invocation_name, *program_invocation_short_name;
  44. #endif /* __USE_GNU */
  45. #endif /* _ERRNO_H */
  46. __END_DECLS
  47. #ifdef _LIBC
  48. #ifdef IS_IN_rtld
  49. # undef errno
  50. # define errno _dl_errno
  51. extern int _dl_errno; /* attribute_hidden */
  52. #elif defined __UCLIBC_HAS_TLS__
  53. # if !defined NOT_IN_libc || defined IS_IN_libpthread
  54. # undef errno
  55. # ifndef NOT_IN_libc
  56. # define errno __libc_errno
  57. # else
  58. # define errno errno /* For #ifndef errno tests. */
  59. # endif
  60. extern __thread int errno attribute_tls_model_ie;
  61. # endif
  62. #endif
  63. #ifndef __set_errno
  64. #define __set_errno(val) (errno = (val))
  65. #endif
  66. #endif /* _LIBC */
  67. #endif /* _ERRNO_H */
  68. /* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so
  69. that printing `error_t' values in the debugger shows the names. We
  70. might need this definition sometimes even if this file was included
  71. before. */
  72. #if defined __USE_GNU || defined __need_error_t
  73. # ifndef __error_t_defined
  74. typedef int error_t;
  75. # define __error_t_defined 1
  76. # endif
  77. # undef __need_error_t
  78. #endif