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Message-ID: <20040916120158.85111.qmail@web90001.mail.scd.yahoo.com>
Date: Thu, 16 Sep 2004 13:01:58 +0100 (BST)
From: =?iso-8859-1?q?Lionel=20Barnett?= <lionelbuk AT yahoo DOT co DOT uk>
Reply-To: cygwin AT cygwin DOT com
Subject: Re: Problem with cat under bash shell
To: cygwin AT cygwin DOT com
In-Reply-To: <20040916103634.GD17670@cygbert.vinschen.de>
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 --- Corinna Vinschen <corinna-cygwin AT cygwin DOT com> wrote: 
> On Sep 16 10:47, Lionel Barnett wrote:
> >  --- Corinna Vinschen <corinna-cygwin AT cygwin DOT com> wrote: 
> > > > /netrel/src/cygwin-1.5.11-1/winsup/cygwin/fhandler.cc:263
> windows
> > > error
> > > > 59
> > > >   756  122627 [main] cat 2668 geterrno_from_win_error: unknown
> > > windows
> > > > error 59, setting errno to 13
> > > 
> > > That looks really weird.  Did you notice that win32 error 59
> means
> > > "An unexpected network error occurred." ?
> > 
> > Yes, I was aware of that.
> > 
> > > Does that give a hint to you?
> > 
> > Um, not really... except that it appears the problem doesn't arise
> if
> > /tmp is accessed locally rather than over the network. However, I
> > constantly read/write/execute files all over the network via Cygwin
> > tools and have not encountered any problems previously. Is there
> > something special about /tmp that I am not aware of?
> 
> 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.

Regards,


=====
Lionel B


	
	
		
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