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Date: Fri, 17 Sep 2004 11:16:38 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Problem with cat under bash shell
Message-ID: <20040917091638.GA9638@cygbert.vinschen.de>
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On Sep 16 13:01, Lionel Barnett wrote:
>  --- Corinna Vinschen <corinna-cygwin AT cygwin DOT com> wrote: 
> > I just curiously tried to reproduce the effect and it was pretty
> > simple.
> > I'm not quite sure, but it seems to be a strange interaction between
> > remote file handling under windows, coupled with the way the
> > temporary
> > file is handled by bash.
> > 
> > What bash does is this:  It opens a temporary file in /tmp which gets
> > everything you type into the here script up to the EOF.  Then it
> > duplicates the handle to become stdin for the still to be called
> > `cat'
> > process.  Next, it unlinks the file.  Unlink is implemented as
> >   
> >    h=CreateFile(FILE_FLAG_DELETE_ON_CLOSE);
> >    CloseHandle(h);
> > 
> > This should result in removing the file as soon as all open handles
> > to
> > the file are closed.  That works, but for some reason also the
> > ReadFile
> > call in cat fails as above.
> > 
> > I don't know how to fix this right now, but the workaround is simply
> > to have /tmp always be a local directory.
> 
> Thanks for the information, Corinna. Actually, what surprises me most
> is that this issue has not been reported more frequently.

I've applied a patch to Cygwin which hopefully solves that for any sort
of remote share.  I tried this with shares on Samba, NT4, XP64 and 2K3.

Check out the next developers snapshot from http://cygwin.com/snapshots/


Corinna

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

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