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Date: Mon, 7 Jan 2002 21:23:53 +0100
From: Corinna Vinschen <cygwin AT cygwin DOT com>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Who is supposed to set SIGURG for OOB  in rlogin/tcp/rcmd??
Message-ID: <20020107212353.J1242@cygbert.vinschen.de>
Mail-Followup-To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
References: <20020105222903 DOT T27340 AT cygbert DOT vinschen DOT de> <200201071733 DOT g07HXZd19334 AT mail DOT redhat DOT com>
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On Mon, Jan 07, 2002 at 10:32:41AM -0700, Mark Paulus wrote:
> Would you like some help, or what kind of patch are you
> looking for? 

A patch to Cygwin to allow OOB signal handling and async-IO handling
even on blocking sockets.  Winsock only supports async-IO on non-
blocking sockets.

Corinna

> 
> On Sat, 5 Jan 2002 22:29:03 +0100, Corinna Vinschen wrote:
> 
> >On Thu, Jan 03, 2002 at 02:47:17PM -0700, Mark Paulus wrote:
> >> Hi,
> >> 
> >> I am using rlogin to talk to a sun box, and have noticed that my rows &
> >> columns are not being set, so I'm not getting good terminal 
> >> characteristics.  After digging down into the rlogin code (and cross
> >> comparing with some debian/linux code), it seems as though someone
> >> is not passing the SIGURG (Urgent Out Of Band data) signal back
> >> to rlogin, and so rlogin does not know that it needs to send the 
> >> terminal characteristics back to the remote session.
> >> 
> >> My question is, who is supposed to be passing on the SIGUSR
> >> signal?  rlogin is setting the appropriate handler, but it is never
> >> being called.
> >
> >SIGURG is sort of a problem for Cygwin due to the way Winsock
> >handles messages.  In contrast to SIGURG on U*X systems, which
> >is sent always when OOB messages arrive, the corresponding Winsock
> >FD_OOB message is only generated when async IO is used (as is on
> >U*X sytems with SIGIO).  Unfortunately, using async IO on sockets
> >has some unwanted side-effects.  I began to implement something
> >appropriate but my current solution breaks ssh so that's not going
> >to help very much.
> >
> >The current Cygwin doesn't handle SIGURG at all and unless I can
> >find a practical workaround for my async IO problem or unless
> >somebody else contributes a patch this stae will not change that
> >quickly.
> >
> >Corinna
> >
> >-- 
> >Corinna Vinschen                  Please, send mails regarding Cygwin to
> >Cygwin Developer                                mailto:cygwin AT cygwin DOT com
> >Red Hat, Inc.
> >
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> 
> 
> 
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-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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