X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-4.6 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FROM,KHOP_RCVD_TRUST,KHOP_THREADED,RCVD_IN_DNSWL_LOW,RCVD_IN_HOSTKARMA_YE X-Spam-Check-By: sourceware.org MIME-Version: 1.0 X-Received: by 10.52.26.200 with SMTP id n8mr20423471vdg.72.1361312204497; Tue, 19 Feb 2013 14:16:44 -0800 (PST) In-Reply-To: <20130219144600.GE23688@calimero.vinschen.de> References: <5114A38B.6060201@gmail.com> <20130219144600.GE23688@calimero.vinschen.de> Date: Wed, 20 Feb 2013 07:16:44 +0900 Message-ID: Subject: Re: non-blocking accept() can hang. From: Tanaka Akira To: cygwin@cygwin.com Content-Type: text/plain; charset=ISO-8859-1 X-IsSubscribed: yes 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 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. -- Tanaka Akira -- 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