82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
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/* $NetBSD: featuretest.h,v 1.9 2009/05/04 16:44:14 ginsbach Exp $ */
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/*
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* Written by Klaus Klein <kleink@NetBSD.org>, February 2, 1998.
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* Public domain.
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*
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* NOTE: Do not protect this header against multiple inclusion. Doing
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* so can have subtle side-effects due to header file inclusion order
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* and testing of e.g. _POSIX_SOURCE vs. _POSIX_C_SOURCE. Instead,
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* protect each CPP macro that we want to supply.
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*/
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/*
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* Feature-test macros are defined by several standards, and allow an
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* application to specify what symbols they want the system headers to
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* expose, and hence what standard they want them to conform to.
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* There are two classes of feature-test macros. The first class
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* specify complete standards, and if one of these is defined, header
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* files will try to conform to the relevant standard. They are:
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*
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* ANSI macros:
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* _ANSI_SOURCE ANSI C89
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*
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* POSIX macros:
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* _POSIX_SOURCE == 1 IEEE Std 1003.1 (version?)
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* _POSIX_C_SOURCE == 1 IEEE Std 1003.1-1990
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* _POSIX_C_SOURCE == 2 IEEE Std 1003.2-1992
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* _POSIX_C_SOURCE == 199309L IEEE Std 1003.1b-1993
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* _POSIX_C_SOURCE == 199506L ISO/IEC 9945-1:1996
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* _POSIX_C_SOURCE == 200112L IEEE Std 1003.1-2001
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* _POSIX_C_SOURCE == 200809L IEEE Std 1003.1-2008
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*
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* X/Open macros:
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* _XOPEN_SOURCE System Interfaces and Headers, Issue 4, Ver 2
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* _XOPEN_SOURCE_EXTENDED == 1 XSH4.2 UNIX extensions
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* _XOPEN_SOURCE == 500 System Interfaces and Headers, Issue 5
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* _XOPEN_SOURCE == 520 Networking Services (XNS), Issue 5.2
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* _XOPEN_SOURCE == 600 IEEE Std 1003.1-2001, XSI option
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* _XOPEN_SOURCE == 700 IEEE Std 1003.1-2008, XSI option
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*
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* NetBSD macros:
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* _NETBSD_SOURCE == 1 Make all NetBSD features available.
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*
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* If more than one of these "major" feature-test macros is defined,
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* then the set of facilities provided (and namespace used) is the
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* union of that specified by the relevant standards, and in case of
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* conflict, the earlier standard in the above list has precedence (so
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* if both _POSIX_C_SOURCE and _NETBSD_SOURCE are defined, the version
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* of rename() that's used is the POSIX one). If none of the "major"
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* feature-test macros is defined, _NETBSD_SOURCE is assumed.
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*
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* There are also "minor" feature-test macros, which enable extra
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* functionality in addition to some base standard. They should be
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* defined along with one of the "major" macros. The "minor" macros
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* are:
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*
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* _REENTRANT
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* _ISOC99_SOURCE
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* _LARGEFILE_SOURCE Large File Support
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* <http://ftp.sas.com/standards/large.file/x_open.20Mar96.html>
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*/
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#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
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#define _POSIX_C_SOURCE 1L
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#endif
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#if !defined(_ANSI_SOURCE) && !defined(_POSIX_C_SOURCE) && \
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!defined(_XOPEN_SOURCE) && !defined(_NETBSD_SOURCE)
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#define _NETBSD_SOURCE 1
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#endif
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/* Never define _REENTRANT on Minix */
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#ifdef __minix
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#if ((_POSIX_C_SOURCE - 0) >= 199506L || (_XOPEN_SOURCE - 0) >= 500) && \
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!defined(_REENTRANT)
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#define _REENTRANT
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#endif
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#endif /* __minix */
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