Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sources.redhat.com/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sources.redhat.com/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com
Date: Thu, 14 Feb 2002 10:59:11 +0100
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Lego IR tower USB driver vs. Cygwin
Message-ID: <20020214105911.S23094@cygbert.vinschen.de>
Mail-Followup-To: cygwin AT cygwin DOT com
References: <5 DOT 1 DOT 0 DOT 14 DOT 0 DOT 20020214195624 DOT 00a03ec0 AT mail DOT mckinn1 DOT vic DOT optushome DOT com DOT au>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <5.1.0.14.0.20020214195624.00a03ec0@mail.mckinn1.vic.optushome.com.au>
User-Agent: Mutt/1.3.22.1i

On Thu, Feb 14, 2002 at 08:26:49PM +1100, Graham Menhennitt wrote:
> The download program attempts to open a device named \\.\legotower1. This 
> works via the standard Win32 call CreateFile(). However, under Cygwin, the 
> effect is quite strange. When you try to open the device using:
> 	open("\\\\.\\legotower1, O_RDWR)
> the machine hangs for a considerable period (~30 seconds). In this time, 
> the machine is essentially dead - the mouse cursor moves but the cursor in 
> [...]
> I've tried debugging it to see the exact parameters that open() eventually 
> uses when it internally calls CreateFIle() - so far no success.

Sounds as if Cygwin tries to access a network drive for some
reason...  unfortunately devices and SMB paths are both using
leading double backslashes so there's room for misinterpretation.

If you run your app under strace you can probably find a line
where suddenly the timestamp jumps to a very big value.  That's
a good starting point for further debugging with gdb.

Corinna

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

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/