1/* Macros to check if a POSIX configuration variable is defined or set.
2
3 Copyright (C) 1991-2021 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#ifndef _POSIX_CONF_VARS_H
21#define _POSIX_CONF_VARS_H
22
23/* The script gen-posix-conf-vars.awk generates the header
24 posix-conf-vars-def.h from the list file posix-conf-vars.list and defines
25 CONF_DEF_* macros for each entry in the list file set to either of
26 CONF_DEF_UNDEFINED, CONF_DEF_DEFINED_SET or CONF_DEF_DEFINED_UNSET. To
27 check configuration variables within glibc code, use the configuration macro
28 functions instead of checking for definitions of the macros. */
29
30#include <posix-conf-vars-def.h>
31
32#define CONF_DEF_UNDEFINED 1
33#define CONF_DEF_DEFINED_SET 2
34#define CONF_DEF_DEFINED_UNSET 3
35
36/* The configuration variable is not defined. */
37#define CONF_IS_UNDEFINED(conf) (CONF_DEF##conf == CONF_DEF_UNDEFINED)
38
39/* The configuration variable is defined. It may or may not be set. */
40#define CONF_IS_DEFINED(conf) (CONF_DEF##conf != CONF_DEF_UNDEFINED)
41
42/* The configuration variable is defined and set. */
43#define CONF_IS_DEFINED_SET(conf) (CONF_DEF##conf == CONF_DEF_DEFINED_SET)
44
45/* The configuration variable is defined but not set. */
46#define CONF_IS_DEFINED_UNSET(conf) (CONF_DEF##conf == CONF_DEF_DEFINED_UNSET)
47
48#endif
49