Win32 FILE_BASIC_INFORMATION.*Time.QuadPart - which value should be used if filesystem does not support it, so Cygwin /usr/bin/stat lists the value as '-'?

[Martin Wege via Cygwin]

On Fri, Apr 5, 2024 at 2:05 AM Martin Wege <martin.l.w...@gmail.com> wrote:
>
> Hello,
>
> I have problems with debugging, so a quick help would be appreciated,
> as I cannot figure this out after several hours of digging.
>
> Cygwin /usr/bin/stat returns "Birth: -" for some files. Which value
> must the CreationTime member of FILE_BASIC_INFORMATION have to cause
> /usr/bin/stat ti return "-"? 0, -1, or something else?

In a related matter:
The Win32 FILE_BASIC_INFORMATION structure defines four time values:

LARGE_INTEGER CreationTime;
LARGE_INTEGER LastAccessTime;
LARGE_INTEGER LastWriteTime;
LARGE_INTEGER ChangeTime;

How can a filesystem indicate if it does not support a particular
timestamp, such as ChangeTime? Should ChangeTime.QuadPart then be -1,
-2 or 0, or another value?

Thanks,
Martin

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