X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org D51BF3858417
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1712697344;
	bh=9JJOlW394ingWnWqpL0UP/ltMsl5fen+iM3bDUHZk/Y=;
	h=Date:To:Subject:References:In-Reply-To:List-Id:List-Unsubscribe:
	List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc:
	From;
	b=xHx3Q8sIBQ8vzbx/+VDk0QJmWUPvT1f9weBQ98TvNMZ1tS9H3T89RD8g8Rz2ra/Jo
	tOQzbaEXY0FaqDGhzUGBvf8Msbn/10vvISTf0tfj8Y+x6aqArxV6XKgwUQC2zjVsAf
	HgZe87r2ZZo7x086guusHUcSVanwlqAYaMadQjP4=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 4EE033858D39
Date:	Tue, 9 Apr 2024 23:14:54 +0200
To:	cygwin AT cygwin DOT com
Subject:	Re: 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 '-'?
Message-ID:	<ZhWvznls2pyLd_YR@calimero.vinschen.de>
Mail-Followup-To:	cygwin AT cygwin DOT com
References:	<CANH4o6O=kbNTptDMNOvg6+HBYTufNgv_71Be2Fn6E3w7+qprVg AT mail DOT gmail DOT com>
	<CANH4o6NzSLKG3TQt6H9+kbn6aW66G0XASwjrTrBc-JVEcvss9g AT mail DOT gmail DOT com>
MIME-Version:	1.0
In-Reply-To:	<CANH4o6NzSLKG3TQt6H9+kbn6aW66G0XASwjrTrBc-JVEcvss9g@mail.gmail.com>
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.30
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
Errors-To:	cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>
X-MIME-Autoconverted:	from base64 to 8bit by delorie.com id 439LFjm7633981

On Apr  5 04:26, Martin Wege via Cygwin wrote:
> On Fri, Apr 5, 2024 at 2:05 AM Martin Wege <martin DOT l DOT wege AT gmail DOT 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?

I'm not aware of a filesystem not supporting ChangeTime, that is,
st_ctime.  Usually only CreationTime (st_birthtime) is missing.

I think setting the timestamp to 0 works for indicating that this kind
of timestamp is not supported.  Cygwin is handling Windows timestamps
this way, but I can't find this in documentation ATM.

But the FS driver can also just fill the CreationTime field with the
same value as LastWriteTime or ChangeTime.  MSFT NFS does that.


Corinna

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -