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cdefs: Add some notes about the different versions of POSIX

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POSIX versions are a bit weird, so add some notes here.

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This commit is contained in:
Warner Losh 2022-07-25 16:19:28 -06:00
parent 30253da1a9
commit be54920c3b
1 changed files with 11 additions and 3 deletions
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14
sys/sys/cdefs.h
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@ -637,15 +637,23 @@
* 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:
* 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
* _POSIX_C_SOURCE == 200112 1003.1-2001
* _POSIX_C_SOURCE == 200809 1003.1-2008
* (1003.1 Issue 5, Single Unix Spec v2, Unix 95)
* _POSIX_C_SOURCE == 200112 1003.1-2001 (1003.1 Issue 6, Unix 03)
* _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 with
* _POSIX_C_SOURCE=200809 and _XOPEN_SOURCE=700
*
* In addition, the X/Open Portability Guide, which is now the Single UNIX
* Specification, defines a feature-test macro which indicates the version of