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1 | /* Macros to check if a POSIX configuration variable is defined or set. |
2 | ||
04277e02 | 3 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
4a6aca7b SP |
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 | <http://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 |