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Date: Sat, 14 Sep 2002 23:45:36 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Question about cygwin process behaviour and bash interactive mode
Message-ID: <20020915034536.GE19955@redhat.com>
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References: <LPEHIHGCJOAIPFLADJAHAELMCMAA DOT chris AT atomice DOT net> <LPEHIHGCJOAIPFLADJAHEELMCMAA DOT chris AT atomice DOT net>
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On Sat, Sep 14, 2002 at 08:36:08PM +0100, Chris January wrote:
>Upon further examination it would appear this is a bug in the tty
>handling code.  First of all, this behaviour is only observed when the
>tty flag is set in the CYGWIN environment variable.  It seems that the
>tty code uses pipes for some reason or another (see tty::make_pipes).

Yeah, it's that wacky tty code in cygwin, always doing wild things like
setting up pipes and stuff.

>However, if a non-cygwin program is launched, which then launches
>another cygwin program, the second cygwin program doesn't detect that
>it's stdin and stdout pipes were created by the tty code (and hence
>should be handled by fhandler_tty).  I don't really understand this
>code well enough to fix this - perhaps someone else could take a look?

It's not a bug.  It's a "don't do that".

All sorts of information gets lost if you have a cygwin program call a
windows program which calls a cygwin program.  The 'ttyness' of a pipe
is only part off the lost info.

cgf

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