posix/posix-conf-vars.h

   1 /* Macros to check if a POSIX configuration variable is defined or set.
   2
   3    Copyright (C) 1991-2017 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    <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