Mailing-List: contact cygwin-help AT sourceware DOT cygnus DOT com; run by ezmlm
Sender: cygwin-owner AT sourceware DOT cygnus DOT com
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT sourceware DOT cygnus DOT com>
List-Archive: <http://sourceware.cygnus.com/ml/cygwin/>
List-Help: <mailto:cygwin-help AT sourceware DOT cygnus DOT com>,
	<http://sourceware.cygnus.com/ml/#faqs>
Delivered-To: mailing list cygwin AT sourceware DOT cygnus DOT com
Message-ID: <37A9E6CE.FA1C0BEA@inspirepharm.com>
Date: Thu, 05 Aug 1999 15:32:30 -0400
From: "Suhaib M. Siddiqi" <ssiddiqi AT inspirepharm DOT com>
Reply-To: ssiddiqi AT ipass DOT net
Organization: Inspire Pharmaceuticals, Inc.
X-Mailer: Mozilla 4.07C-SGI [en] (X11; I; IRIX64 6.5 IP28)
MIME-Version: 1.0
To: cygwin AT sourceware DOT cygnus DOT com
Subject: Re: Accessing serial port.
References: <Pine DOT GSO DOT 4 DOT 10 DOT 9908051257330 DOT 12515-100000 AT scully> <NDBBLHPPKKBKPBLLMFJBCEGKCBAA DOT ssiddiqi AT ipass DOT net> <19990805151017 DOT B3170 AT cygnus DOT com>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Chris Faylor wrote:
> 
> On Thu, Aug 05, 1999 at 01:18:26PM -0400, Suhaib M. Siddiqi wrote:
> >
> >
> >>
> >>
> >> I am porting my C codes from DJGPP to Cygwin. One of the modules has
> >> several lines which read and write to COM1. I rewrite the code using
> >> open ("/dev/com1"), read (....), write (....), etc. However, the code
> >> seems to hang. The exact same code works fine under Linux by replacing
> >> "/dev/com1" to "/dev/ttyS0".
> >>
> >
> >This requires accessing the hardware through a proper device driver on
> >Windows.  It is not that easy to change /dev/xxx to someting.  Check
> >http://www.microsoft.com/hwdrv/ddk for info about devices.  If it would
> >have been so easy I would have finished Xfree86 port a long time ago
> >;-)
> 
> Um.  No.  I don't know why you think that this requires a device driver.
> You should be able to access /dev/com1 using normal open/close/read/write
> semantics.
> 
> However, there were serial problems in B20.1 that should be fixed in
> current snapshots: http://sourceware.cygnus.com/cygwin/snapshots/
> 
> cgf

I think for serial only might be possible.  
In my case, I need more then /dev/com1.  
I did try /dev/com1 on Windows NT  and it was
crashing, at least my code, with 
privilaged_access_violation.


Suhaib

--
Want to unsubscribe from this list?
Send a message to cygwin-unsubscribe AT sourceware DOT cygnus DOT com