1/* Copyright (C) 1991-2015 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, see
16 <http://www.gnu.org/licenses/>. */
17
18/*
19 * ISO C99 Standard: 7.5 Errors <errno.h>
20 */
21
22#ifndef _ERRNO_H
23
24/* The includer defined __need_Emath if he wants only the definitions
25 of EDOM and ERANGE, and not everything else. */
26#ifndef __need_Emath
27# define _ERRNO_H 1
28# include <features.h>
29#endif
30
31__BEGIN_DECLS
32
33/* Get the error number constants from the system-specific file.
34 This file will test __need_Emath and _ERRNO_H. */
35#include <bits/errno.h>
36#undef __need_Emath
37
38#ifdef _ERRNO_H
39
40/* Declare the `errno' variable, unless it's defined as a macro by
41 bits/errno.h. This is the case in GNU, where it is a per-thread
42 variable. This redeclaration using the macro still works, but it
43 will be a function declaration without a prototype and may trigger
44 a -Wstrict-prototypes warning. */
45#ifndef errno
46extern int errno;
47#endif
48
49#ifdef __USE_GNU
50
51/* The full and simple forms of the name with which the program was
52 invoked. These variables are set up automatically at startup based on
53 the value of ARGV[0] (this works only if you use GNU ld). */
54extern char *program_invocation_name, *program_invocation_short_name;
55#endif /* __USE_GNU */
56#endif /* _ERRNO_H */
57
58__END_DECLS
59
60#endif /* _ERRNO_H */
61
62/* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so
63 that printing `error_t' values in the debugger shows the names. We
64 might need this definition sometimes even if this file was included
65 before. */
66#if defined __USE_GNU || defined __need_error_t
67# ifndef __error_t_defined
68typedef int error_t;
69# define __error_t_defined 1
70# endif
71# undef __need_error_t
72#endif
73