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Subject:	Re: GetVersionEx() depreciated, what should be used instead for
	Windows 7/8/10?
To:	cygwin AT cygwin DOT com
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Date:	Tue, 19 Mar 2024 11:20:58 +0100
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From:	Christian Franke via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Christian Franke <Christian DOT Franke AT t-online DOT de>
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Cedric Blancher via Cygwin wrote:
> How does cygwin uname -s work, i.e. how does it get the OS version,
> revision and build number ('10.0-19045')?
> I tried to replicate it via GetVersionEx(), but that is deprecated.
>

AFAICS, MS does not offer an official way to retrieve the actual Windows 
version via the Win32 API layer. GetVersionEx() is unable to detect 
Windows versions which are more recent than the compatibility level 
advertised in the application manifest.

Cygwin uses the undocumented RtlGetNtVersionNumbers() from ntdll.dll 
because even RtlGetVersion() may not return the correct values. See 
function wincapc::init()
https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/cygwin/wincap.cc

-- 
Regards,
Christian


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