X-Spam-Check-By: sourceware.org
Date: Thu, 24 Nov 2005 12:25:03 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: WSADuplicateSocket used to implement ssh session multiplexing?
Message-ID: <20051124112503.GA2999@calimero.vinschen.de>
Reply-To: cygwin AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
References: <4a162fd0511231156h142d7a7fnb598aee09b134ec4 AT mail DOT gmail DOT com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4a162fd0511231156h142d7a7fnb598aee09b134ec4@mail.gmail.com>
User-Agent: Mutt/1.4.2i
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
Precedence: bulk
List-Unsubscribe: <mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe: <mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive: <http://sourceware.org/ml/cygwin/>
List-Post: <mailto:cygwin AT cygwin DOT com>
List-Help: <mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender: cygwin-owner AT cygwin DOT com
Mail-Followup-To: cygwin AT cygwin DOT com
Delivered-To: mailing list cygwin AT cygwin DOT com

On Nov 23 11:56, Jeff Hardy wrote:
> I understand that windows does not allow sending open file descriptors
> over sockets and that is the reason that session multiplexing through
> a control master doesn't work. The documentation for
> WSADuplicateSocket states that the resulting WSAPROTOCOL_INFO
> structure can be sent through an IPC to a target process and that the
> target process can then call WSASocket with that info and the effect
> is a shared socket. If the sending process closes the socket, then the
> target has the connection to itself.
> 
>  Is this essentially the same as sending an open file descriptor
> through a socket? I am of course assuming that the fd that is being
> sent is for a socket.
> 
> Or am I really missing the big picture?

You're missing the infrastructure necessary to send file descriptor
data between processes.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat, Inc.

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Problem reports:       http://cygwin.com/problems.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/