Systemnahe Programmierung in C: errno.h
| Systemnahe Programmierung in C: errno.h |
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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
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, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
18
19/*
20 * ISO C99 Standard: 7.5 Errors <errno.h>
21 */
22
23#ifndef _ERRNO_H
24
25/* The includer defined __need_Emath if he wants only the definitions
26 of EDOM and ERANGE, and not everything else. */
27#ifndef __need_Emath
28# define _ERRNO_H 1
29# include <features.h>
30#endif
31
32__BEGIN_DECLS
33
34/* Get the error number constants from the system-specific file.
35 This file will test __need_Emath and _ERRNO_H. */
36#include <bits/errno.h>
37#undef __need_Emath
38
39#ifdef _ERRNO_H
40
41/* Declare the `errno' variable, unless it's defined as a macro by
42 bits/errno.h. This is the case in GNU, where it is a per-thread
43 variable. This redeclaration using the macro still works, but it
44 will be a function declaration without a prototype and may trigger
45 a -Wstrict-prototypes warning. */
46#ifndef errno
47extern int errno;
48#endif
49
50#ifdef __USE_GNU
51
52/* The full and simple forms of the name with which the program was
53 invoked. These variables are set up automatically at startup based on
54 the value of ARGV[0] (this works only if you use GNU ld). */
55extern char *program_invocation_name, *program_invocation_short_name;
56#endif /* __USE_GNU */
57#endif /* _ERRNO_H */
58
59__END_DECLS
60
61#endif /* _ERRNO_H */
62
63/* The Hurd <bits/errno.h> defines `error_t' as an enumerated type so
64 that printing `error_t' values in the debugger shows the names. We
65 might need this definition sometimes even if this file was included
66 before. */
67#if defined __USE_GNU || defined __need_error_t
68# ifndef __error_t_defined
69typedef int error_t;
70# define __error_t_defined 1
71# endif
72# undef __need_error_t
73#endif
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| Letzte Änderung: 14.05.2002 | © Prof. Dr. Uwe Schmidt |
