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Date: Thu, 17 Feb 2005 13:31:25 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: more ctime bugs
Message-ID: <20050217123125.GT2597@cygbert.vinschen.de>
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References: <020920052127.27398.420A803A0009BD7500006B0622007507440A050E040D0C079D0A@comcast.net> <20050211093508.GB27256@cygbert.vinschen.de> <420CBCE6.60603@byu.net> <20050211142542.GE2597@cygbert.vinschen.de> <loom.20050213T052458-195@post.gmane.org>
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On Feb 13 04:30, Eric Blake wrote:
> Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
> > I'll update Cygwin to set ctime in close and link.  Link
> > is special since it doesn't involve using any explicit file descriptors,
> > so it's a bit unclear where to set the flags inside Cygwin to get that
> > right.  Using close() seems a good way to have ctime set for write()
> > as well as open(O_TRUNC).
> 
> I see the new has_changed flag in the 20050211 snapshot.  But you still have to
> add a call to touch_ctime() within the stat() family of calls if has_changed is
> set, in order to comply with the required semantics; stat and lstat are not
> allowed to return out-of-date timestamps.

You know that this contradicts the target to maintain speed on write?
It's not done with adding a call to touch_ctime() to fstat, because
that only affects the application which also has written to the file.
If I read SUSv3 correctly, any call to stat/fstat/lstat on the file
by any application would require to update the timestamp.  That's no
fun.  I'm willing to simply ignore this.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          mailto:cygwin@cygwin.com
Red Hat, Inc.

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