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Date: Wed, 7 Jan 2009 17:09:25 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: [1.7] Cygwin 1.7 misnames hardlinks
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On Jan  7 09:38, Brian Ford wrote:
> On Wed, 7 Jan 2009, Corinna Vinschen wrote:
> 
> > The same happens with all hardlinks to files used by the system.  The NT
> > status code returned when trying to set the delete disposition flag is
> > C0000121, STATUS_CANNOT_DELETE.  None of the Windows native methods to
> > delete these hardlinks works.  I'm still puzzeled how to get rid of
> > them. Does anybody knows how to do that?
> 
> Just a WAG, but disable Windows File Protection?
> 
> http://support.microsoft.com/kb/222193

No, I found the solution by getting the double-plus surprising result
that removing these hardlinks works in Cygwin 1.5.  For some reason only
the OS hackers at Microsoft might grok, setting the delete dispostion
flag for a file (*) doesn't work, but opening the file with the
FILE_FLAG_DELETE_ON_CLOSE flag and then closing it again (**) works
fine.  Go figure!  Unfortunately the DELETE_ON_CLOSE stuff is too
dangerous in some circumstances so it's not a generic solution.

I'm preparing a fix for 1.7.


Corinna

(*)  Which is also what the Win32 function DeleteFile does.
(**) Which is what Cygwin 1.5 and the native function ZwDeleteFile does.

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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