1  /* Macros to check if a POSIX configuration variable is defined or set.
       2  
       3     Copyright (C) 1991-2023 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