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Date: Thu, 13 Jul 2000 12:30:44 -0400
To: "cygwin AT sourceware DOT cygnus DOT com" <cygwin AT hotpop DOT com>
From: "Larry Hall (RFK Partners, Inc)" <lhall AT rfk DOT com>
Subject: Re: Have rename() semantics changed?
In-Reply-To: <20000713122327.A9529@cygnus.com>
References: <779F20BCCE5AD31186A50008C75D9979171747 AT silldn_mail1 DOT sanwaint DOT com>
 <779F20BCCE5AD31186A50008C75D9979171747 AT silldn_mail1 DOT sanwaint DOT com>
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At 12:23 PM 7/13/2000, Chris Faylor wrote:
>On Thu, Jul 13, 2000 at 05:15:06PM +0100, Fifer, Eric wrote:
> >
> >Stewart Greenhill wrote:
> >> The latest cygwin seems not to allow open files to be renamed. This
> >> works under Unix. It is not normally allowed under Windows, but worked
> >> in previous versions of the cygwin environment.
> >> 
> >> Is this an official change, or could it be a bug?
> >
> >I compared strace's on b20.1 and 1.1.2 and the shared argument to
> >CreateFileA has changed.  FILE_SHARE_DELETE was dropped from
> >host_dependent.shared in dcrt0.cc (host_dependent_constants::init).
> >This was the comment at the time:
> >
> >  Sat Mar 18 01:32:04 2000  Christopher Faylor <cgf AT cygnus DOT com>
> >
> >        * dcrt0.cc (host_dependent_constants::init): Eliminate DELETE flag
> >        from shared constant.
> >
> >I put it back and your test program works again.  Perhaps Chris can
> >shed some light on the reason for the change.
>
>Can you still unlink opened files on Windows 9x, Windows NT, and W2K
>with this change?  I believe that is why I removed this.  Either that
>or it prevented files from being opened.  Sorry that I don't remember.
>
>If the above still works, then I'll put this back and comment this
>so we won't have to guess next time.
>
>cgf



According to the MSDN, FILE_SHARE_DELETE is a NT/W2K thingy.  That implies 
that this functionality is only available there.  One would hope that 
enabling it doesn't cause 9x to misbehave but who knows.  I suppose the
constant could be conditionally compiled in if need be...



Larry Hall                              lhall AT rfk DOT com
RFK Partners, Inc.                      http://www.rfk.com
118 Washington Street                   (508) 893-9779 - RFK Office
Holliston, MA 01746                     (508) 893-9889 - FAX



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