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Date: Mon, 15 Oct 2001 14:34:29 +0200
From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Pavel Machek <pavel@suse.cz>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>, Jelson <jelson@circlemud.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [ANNOUNCE] FUSD v1.00: Framework for User-Space Devices
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Pavel Machek wrote:
> > Additionally you still don't need a FUSD driver for that case.  All
> > you need is to have is a ptty.  Because that is what modem drivers
> > are now.  And the ptty route has binary and source compatiblity
> > to multiple unix platforms.
> 
> I do not think tty/pty pair does cut it for AT emulation. Can you
> really emulate all neccessary features using pty/tty?

Perhaps.  Terminal modes & speeds & special lines and so on set on the
tty side can be seen on the pty side, although I think the pty is not
notified immediately so it has to poll if it wants to detect terminal
programs sending a BREAK signal and things like that.

I had a look at this about a year ago.  I remember that a couple of
small changes to the pty/tty layer would have been very handy to improve
the quality of serial port emulation, and that might be the thing to do.

-- Jamie
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