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Date:	Tue, 27 Apr 2004 11:40:15 -0500
From:	Brian Ford <ford AT vss DOT fsi DOT com>
Reply-To:	cygwin AT cygwin DOT com
To:	Jim Brain <brain AT jbrain DOT com>
cc:	cygwin AT cygwin DOT com
Subject:	Re: Need to replicate TIOCGICOUNT and TIOCMIWAIT on cygwin
In-Reply-To:	<loom.20040427T053617-292@post.gmane.org>
Message-ID:	<Pine.CYG.4.58.0404271133030.5560@fordpc.vss.fsi.com>
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On Tue, 27 Apr 2004, Jim Brain wrote:

> I have an application that I need to port to windows, and it uses these two
> Linux IOCTLs.  Specifically, the app needs to monitor the DSR line and signal
> another process when it changes.

What kind of response time do you need?  You could poll it with a TIOCMGET
and a small sleep (2 ms is the shortest sleep available via Cygwin).

> I have migrated the rest of the app over with minimal work, but obviously
> cygwin does not support linux/serial.h.  I am OK with a rewrite of this
> function (the rest is working fine), and am also OK writing it in straight
> Win32 calls, but I don't know how to relate my opened fd with a HANDLE to use
> the relevant WIN32 calls.

To eliminate this problem, why not add it to Cygwin and contribute it?
See http://cygwin.com/contrib.html for more details.

On the other hand, a patch to provide this hook might be accepted.  The
details above still apply, though.

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...

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