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Re: Who is supposed to set SIGURG for OOB in rlogin/tcp/rcmd??
- From: Corinna Vinschen <cygwin at cygwin dot com>
- To: "cygwin at cygwin dot com" <cygwin at cygwin dot com>
- Date: Mon, 7 Jan 2002 21:23:53 +0100
- Subject: Re: Who is supposed to set SIGURG for OOB in rlogin/tcp/rcmd??
- References: <20020105222903.T27340@cygbert.vinschen.de> <200201071733.g07HXZd19334@mail.redhat.com>
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-
> 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
> >Corinna Vinschen Please, send mails regarding Cygwin to
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> >Red Hat, Inc.
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Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Developer mailto:email@example.com
Red Hat, Inc.
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Bug reporting: http://cygwin.com/bugs.html