The branch main has been updated by imp: URL: https://cgit.FreeBSD.org/src/commit/?id=be54920c3b72f0b9284ddaf95796df25dca3eaf5
commit be54920c3b72f0b9284ddaf95796df25dca3eaf5 Author: Warner Losh <[email protected]> AuthorDate: 2022-07-25 22:19:28 +0000 Commit: Warner Losh <[email protected]> CommitDate: 2022-07-26 03:34:34 +0000 cdefs: Add some notes about the different versions of POSIX POSIX versions are a bit weird, so add some notes here. Sponsored by: Netflix --- sys/sys/cdefs.h | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h index 2295dd39f5ad..1ace5fbee787 100644 --- a/sys/sys/cdefs.h +++ b/sys/sys/cdefs.h @@ -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
