X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Date: Wed, 20 Feb 2013 08:51:43 +0100 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: non-blocking accept() can hang. Message-ID: <20130220075143.GI23688@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <5114A38B.6060201@gmail.com> <20130219144600.GE23688@calimero.vinschen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On Feb 20 07:16, Tanaka Akira wrote: > 2013/2/19 Corinna Vinschen > > > > I debugged your example code, and it can't work on Cygwin. The problem > > is that accept/connect on AF_LOCAL sockets performs a handshake > > operation to make sure that the other side of the socket is a Cygwin > > process as well, and to propagate credential information between > > client and listener. The way it's implemented right now requires that > > both sides of the socket are responsive. That's a safe thing for the > > accept call here, but since there's neither a blocking connect, nor a > > select or poll call waiting on the connecting side of the socket, nothing > > goes forward. > > > > To get this code working, you have to use either AF_INET or AF_INET6 > > sockets, or you have to start a thread calling select or poll, so > > there's an active function call which allows to perform the handshake > > from the connecting side. > > Thank you for the information. > I'll use threads. The most simple way to get a connected local socket is to use the socketpair function, btw. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple