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From:	"Mark Paulus" <commpg AT yahoo DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Date:	Mon, 07 Jan 2002 10:32:41 -0700
Reply-To:	"Mark Paulus" <commpg AT yahoo DOT com>
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In-Reply-To:	<20020105222903.T27340@cygbert.vinschen.de>
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Subject:	Re: Who is supposed to set SIGURG for OOB in rlogin/tcp/rcmd??

Would you like some help, or what kind of patch are you
looking for? 

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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