Date: Mon, 11 Dec 2006 15:07:03 -0500
From: Bob Rossi <bob_rossi AT cox DOT net>
To: cygwin AT cygwin DOT com
Subject: Re: sh problems
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On Mon, Dec 11, 2006 at 11:50:01AM -0800, Brian Dessent wrote:
> Bob Rossi wrote:
> 
> > I think that I have narrowed this down enough to say that this is a
> > cygwin issue. Hopefully, I can get some advice on this list. If I run
> > these commands in a dos window that I started nativly on the machine,
> 
> So, essentially, this boils down to "I'm running a non-Cygwin app
> connected to a Cygwin tty and it's behaving strangely."  Well, duh. 
> Non-cygwin apps attached to ttys do that, because non-Cygwin apps don't
> know what a tty is, they see it as a pipe and get confused.  I don't
> understand how you'd expect this to work, unless you thought for some
> reason that the fact that you're using MSYS's sh would somehow make it
> work because MSYS is an ancient fork of Cygwin.  But it's been all
> patched to hell so as to specifically not appear as a Cygwin app, so
> it's no different than any other non-Cygwin binary in that regard.  If
> you want MSYS's sh to think you're connected to a terminal you'll need
> to port openssh to use MSYS and not Cygwin's runtime, so that sh is
> connected to a MSYS tty (if MSYS even retained the pty emulation code at
> all, I have no idea.)  Remember the key point here, that ttys don't
> exist on windows and so they have to be emulated, and this emulation
> only works if all the programs involved are in on the prank.

Thanks, that is very helpful.

Bob Rossi

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