Re: [PATCH v1 01/23] man/man2/clock_getres.2: HISTORY: Update first POSIX appearance of clock_* syscalls

[Alejandro Colomar <alx@kernel.org>]

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Hi Seth,

On Thu, Jan 22, 2026 at 12:32:55AM +0000, Seth McDonald wrote:
> Hi Alex,
> 
> On Wed, Jan 21, 2026 at 04:49:25PM +0100, Alejandro Colomar wrote:
> > Hi Seth,
> > 
> > On Wed, Jan 21, 2026 at 12:06:57PM +0000, Seth McDonald wrote:
> > > clock_getres(2), clock_gettime(2), and clock_settime(2) first appeared
> > > in POSIX.1-1996.[1]  SUSv2 incorporates POSIX.1-1996, so listing both is
> > > redundant.
> > 
> > Are you sure SUSv2 incorporates POSIX.1-1996?  Could you please show
> > sources for that?
> 
> We can reference the following SUSv2 PDF:
> CAE Specification, System Interfaces and Headers, Issue 5.
> <https://pubs.opengroup.org/onlinepubs/009639399/toc.pdf>
> 
> Section 1.6 "Relationship to Formal Standards", page 11 states:
> 
> 	Great care has been taken to ensure that this specification is
> 	fully aligned with the following formal standards:
> 	- ISO/IEC 9945-1:1996
> 	- ISO/IEC 9945-2:1993
> 	- ISO/IEC 9899:1990
> 	- ISO/IEC 9899:1990/Amendment 1:1994 (E) (MSE)
> 	- Federal Information Procurement Standards (FIPS) 151-2.
> 
> 	Any conflict between this specification and any of these
> 	standards is unintentional.
> 
> Additionally, section 1.7 "Portability", page 12 states:
> 
> 	This document describes a superset of the requirements of the
> 	ISO POSIX-1 standard and the ISO C standard. [...] (The ISO
> 	POSIX-1 standard is identical to IEEE Std 1003.1-1996, which is
> 	often referred to as the POSIX.1 standard. [...])
> 
> For context, page xiii defines "ISO C" as ISO/IEC 9899:1990 including
> Technical Corrigendum 1:1994 and Amendment 1:1994.  And "ISO POSIX-1" as
> ISO/IEC 9945-1:1996.
> 
> So SUSv2 XSH is a superset of POSIX.1-1996 and C95.

Thanks!  And then I guess POSIX.1-1996 would also be based on C95.
This is quite interesting!


Have a lovely night!
Alex

> 
> -- 
> Take care,
> 	Seth McDonald.
> 
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