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Subject:	Re: Handing filesystems which do not support some timestamp fields in
	|FILE_BASIC_INFO| and Microsoft NFSv3 driver "NfsV3Attributes" EA ...
To:	cygwin AT cygwin DOT com
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From:	Cedric Blancher via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Cedric Blancher <cedric DOT blancher AT gmail DOT com>
Sender:	"Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

On Wed, 22 Jan 2025 at 00:38, Roland Mainz via Cygwin <cygwin AT cygwin DOT com> wrote:
>
> Hi!
>
> ----
>
> If a Windows filesystem does not support a type of timestamp it sets
> the matching timestamp field in |FILE_BASIC_INFO| to |0LL| (e.g. see
> Windows-driver-samples/filesys/cdfs/fileinfo.c:
> |Buffer->LastAccessTime.QuadPart = 0| ; typically this can affect
> |FILE_BASIC_INFO.CreationTime| and/or
> |FILE_BASIC_INFO.LastAccessTime|, but formally any combination of
> timestamp fields can be unsupported(==|0LL|)), and the Microsoft NFSv3
> driver sets the matching
> |nfs_timestruc_t.tv_sec|+|nfs_timestruc_t.tv_nsec| to a negative value
> (traditional UNIX uses -1, see
> https://github.com/gagern/gnulib/blob/master/lib/stat-time.h#L173 -
> and this value is then propagated via NFS), but I can't find a place
> in Cygwin where this is explicitly handled - is this missing, or is
> this code handling this somehow implicitly ?
>

What should Cygwin stat() return if a timestamp field is not supported
by the file system? Return tv_sec=-1?

Ced
-- 
Cedric Blancher <cedric DOT blancher AT gmail DOT com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur

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