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Date: Fri, 29 Aug 2008 00:32:57 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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Subject: Re: [ANNOUNCE] OSS Proxy using CUSE
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> serial ports as ptys+userspace a much more capable replacement.  It's 
> not trivial, though, because the interpretation of the BREAK has to be 
> done when received, not when sent, which means supporting a 257th value 
> in the underlying buffer setup.

That bit of the problem is trivial. Its the rest of the behavioural
differences that are more of a nightmare - parity, flow control
differences, modem line emulation, being able to hook into things like
ldisc change/termios change.

Break is about a half hour job.

Alan