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| 1 | /* Error constants. Generic version. |
|---|---|
| 2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | /* This file defines the errno constants. */ |
| 20 | |
| 21 | #ifndef _BITS_ERRNO_H |
| 22 | #define _BITS_ERRNO_H 1 |
| 23 | |
| 24 | #if !defined _ERRNO_H |
| 25 | # error "Never include <bits/errno.h> directly; use <errno.h> instead." |
| 26 | #endif |
| 27 | |
| 28 | #error "Generic bits/errno.h included -- port is incomplete." |
| 29 | |
| 30 | /* Authors of new ports of the GNU C Library must override this file |
| 31 | with their own bits/errno.h in an appropriate subdirectory of |
| 32 | sysdeps/. Its function is to define all of the error constants |
| 33 | from C2011 and POSIX.1-2008, with values appropriate to the |
| 34 | operating system, and any additional OS-specific error constants. |
| 35 | |
| 36 | C2011 requires all error constants to be object-like macros that |
| 37 | expand to "integer constant expressions with type int, positive |
| 38 | values, and suitable for use in #if directives". Moreover, all of |
| 39 | their names must begin with a capital E, followed immediately by |
| 40 | either another capital letter, or a digit. It is OK to define |
| 41 | macros that are not error constants, but only in the implementation |
| 42 | namespace. |
| 43 | |
| 44 | errno.h is sometimes included from assembly language. Therefore, |
| 45 | when __ASSEMBLER__ is defined, bits/errno.h may only define macros; |
| 46 | it may not make any other kind of C declaration or definition. |
| 47 | Also, the error constants should, if at all possible, expand to |
| 48 | simple decimal or hexadecimal numbers. */ |
| 49 | |
| 50 | #endif /* bits/errno.h. */ |
| 51 |
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