/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Berkeley Software Design, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _SYS__VISIBLE_H_ #define _SYS__VISIBLE_H_ /*- * The following definitions are an extension of the behavior originally * implemented in <sys/_posix.h>, but with a different level of granularity. * POSIX.1 requires that the macros we test be defined before any standard * header file is included. * * Here's a quick run-down of the versions (and some informal names) * defined(_POSIX_SOURCE) 1003.1-1988 * encoded as 198808 below * _POSIX_C_SOURCE == 1 1003.1-1990 * encoded as 199009 below * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option * encoded as 199209 below * _POSIX_C_SOURCE == 199309 1003.1b-1993 * (1003.1 Issue 4, Single Unix Spec v1, Unix 93) * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995, * and the omnibus ISO/IEC 9945-1: 1996 * (1003.1 Issue 5, Single Unix Spec v2, Unix 95) * _POSIX_C_SOURCE == 200112 1003.1-2001 (1003.1 Issue 6, Unix 03) * with _XOPEN_SOURCE=600 * _POSIX_C_SOURCE == 200809 1003.1-2008 (1003.1 Issue 7) * IEEE Std 1003.1-2017 (Rev of 1003.1-2008) is * 1003.1-2008 with two TCs applied and * _XOPEN_SOURCE=700 * _POSIX_C_SOURCE == 202405 1003.1-2004 (1003.1 Issue 8), IEEE Std 1003.1-2024 * with _XOPEN_SOURCE=800 * * In addition, the X/Open Portability Guide, which is now the Single UNIX * Specification, defines a feature-test macro which indicates the version of * that specification, and which subsumes _POSIX_C_SOURCE. * * Our macros begin with two underscores to avoid namespace screwage. */ /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */ #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */ #define _POSIX_C_SOURCE 199009 #endif /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */ #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2 #undef _POSIX_C_SOURCE #define _POSIX_C_SOURCE 199209 #endif /* * Deal with various X/Open Portability Guides and Single UNIX Spec. We use the * '- 0' construct so software that defines _XOPEN_SOURCE to nothing doesn't * cause errors. X/Open CAE Specification, August 1994, System Interfaces and * Headers, Issue 4, Version 2 section 2.2 states an empty definition means the * same thing as _POSIX_C_SOURCE == 2. This broadly mirrors "System V Interface * Definition, Fourth Edition", but earlier editions suggest some ambiguity. * However, FreeBSD has histoically implemented this as a NOP, so we just * document what it should be for now to not break ports gratuitously. */ #ifdef _XOPEN_SOURCE #if _XOPEN_SOURCE - 0 >= 800 #define __XSI_VISIBLE 800 #undef _POSIX_C_SOURCE #define _POSIX_C_SOURCE 202405 #elif _XOPEN_SOURCE - 0 >= 700 #define __XSI_VISIBLE 700 #undef _POSIX_C_SOURCE #define _POSIX_C_SOURCE 200809 #elif _XOPEN_SOURCE - 0 >= 600 #define __XSI_VISIBLE 600 #undef _POSIX_C_SOURCE #define _POSIX_C_SOURCE 200112 #elif _XOPEN_SOURCE - 0 >= 500 #define __XSI_VISIBLE 500 #undef _POSIX_C_SOURCE #define _POSIX_C_SOURCE 199506 #else /* #define _POSIX_C_SOURCE 199209 */ #endif #endif /* * Deal with all versions of POSIX. The ordering relative to the tests above is * important. */ #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) #define _POSIX_C_SOURCE 198808 #endif #ifdef _POSIX_C_SOURCE #if _POSIX_C_SOURCE >= 202405 #define __POSIX_VISIBLE 202405 #define __ISO_C_VISIBLE 2017 #elif _POSIX_C_SOURCE >= 200809 #define __POSIX_VISIBLE 200809 #define __ISO_C_VISIBLE 1999 #elif _POSIX_C_SOURCE >= 200112 #define __POSIX_VISIBLE 200112 #define __ISO_C_VISIBLE 1999 #elif _POSIX_C_SOURCE >= 199506 #define __POSIX_VISIBLE 199506 #define __ISO_C_VISIBLE 1990 #elif _POSIX_C_SOURCE >= 199309 #define __POSIX_VISIBLE 199309 #define __ISO_C_VISIBLE 1990 #elif _POSIX_C_SOURCE >= 199209 #define __POSIX_VISIBLE 199209 #define __ISO_C_VISIBLE 1990 #elif _POSIX_C_SOURCE >= 199009 #define __POSIX_VISIBLE 199009 #define __ISO_C_VISIBLE 1990 #else #define __POSIX_VISIBLE 198808 #define __ISO_C_VISIBLE 0 #endif /* _POSIX_C_SOURCE */ /* * When we've explicitly asked for a newer C version, make the C variable * visible by default. Also honor the glibc _ISOC{11,23}_SOURCE macros * extensions. Both glibc and OpenBSD do this, even when a more strict * _POSIX_C_SOURCE has been requested, and it makes good sense (especially for * pre POSIX 2024, since C11 is much nicer than the old C99 base). Continue the * practice with C23, though don't do older standards. Also, GLIBC doesn't have * a _ISOC17_SOURCE, so it's not implemented here. glibc has earlier ISOCxx defines, * but we don't implement those as they are not relevant enough. */ #if _ISOC23_SOURCE || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L) #undef __ISO_C_VISIBLE #define __ISO_C_VISIBLE 2023 #elif _ISOC11_SOURCE || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) #undef __ISO_C_VISIBLE #define __ISO_C_VISIBLE 2011 #endif #else /* _POSIX_C_SOURCE */ /*- * Deal with _ANSI_SOURCE: * If it is defined, and no other compilation environment is explicitly * requested, then define our internal feature-test macros to zero. This * makes no difference to the preprocessor (undefined symbols in preprocessing * expressions are defined to have value zero), but makes it more convenient for * a test program to print out the values. * * If a program mistakenly defines _ANSI_SOURCE and some other macro such as * _POSIX_C_SOURCE, we will assume that it wants the broader compilation * environment (and in fact we will never get here). */ #if defined(_ANSI_SOURCE) /* Hide almost everything. */ #define __POSIX_VISIBLE 0 #define __XSI_VISIBLE 0 #define __BSD_VISIBLE 0 #define __ISO_C_VISIBLE 1990 #define __EXT1_VISIBLE 0 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */ #define __POSIX_VISIBLE 0 #define __XSI_VISIBLE 0 #define __BSD_VISIBLE 0 #define __ISO_C_VISIBLE 1999 #define __EXT1_VISIBLE 0 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */ #define __POSIX_VISIBLE 0 #define __XSI_VISIBLE 0 #define __BSD_VISIBLE 0 #define __ISO_C_VISIBLE 2011 #define __EXT1_VISIBLE 0 #elif defined(_C23_SOURCE) /* Localism to specify strict C23 env. */ #define __POSIX_VISIBLE 0 #define __XSI_VISIBLE 0 #define __BSD_VISIBLE 0 #define __ISO_C_VISIBLE 2023 #define __EXT1_VISIBLE 0 #else /* Default environment: show everything. */ #define __POSIX_VISIBLE 202405 #define __XSI_VISIBLE 800 #define __BSD_VISIBLE 1 #define __ISO_C_VISIBLE 2023 #define __EXT1_VISIBLE 1 #endif #endif /* _POSIX_C_SOURCE */ /* User override __EXT1_VISIBLE */ #if defined(__STDC_WANT_LIB_EXT1__) #undef __EXT1_VISIBLE #if __STDC_WANT_LIB_EXT1__ #define __EXT1_VISIBLE 1 #else #define __EXT1_VISIBLE 0 #endif #endif /* __STDC_WANT_LIB_EXT1__ */ #endif /* !_SYS__VISIBLE_H_ */
