1 /* Macros to check if a POSIX configuration variable is defined or set. 2 3 Copyright (C) 1991-2022 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