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Date:	Mon, 17 Sep 2012 04:03:09 -0700
From:	Daniel Colascione <dancol AT dancol DOT org>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Win PTY library.
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On 9/15/2012 9:21 AM, Christopher Faylor wrote:
> On Sat, Sep 15, 2012 at 12:15:49PM -0400, Earnie Boyd wrote:
>> I just discovered https://github.com/rprichard/winpty and thought
>> Cygwin users and developers may be interested.  The license is MIT
>> style.
>=20
> Looks interesting.  I've had something similar sitting around in my
> Cygwin sandbox for a while.  It would be nice to have a real console-based
> pty implementation.

Unfortunately, this program works by polling and scraping a hidden console
window. Any approach of this type will lose data. (No, you can't synchronize
your scraping by using console accessibility APIs because conhost calls out=
 into
accessibility with its locks held, and if you try to read the console buffe=
r in
this context, you deadlock.)

The best userspace solution would be chained DLL injection, but this approa=
ch
has its own problems --- the console handle can get decoupled from the DLL
injection in a number of ways. The most robust approach would be an NT filt=
er
driver attached to the console driver itself. That'd only work on systems w=
ith a
non-insane console layer (i.e., post-Vista systems), and you'd have to figu=
re
out the internal console communication protocol.


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