X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-1.4 required=5.0 tests=AWL,BAYES_00 X-Spam-Check-By: sourceware.org Date: Tue, 16 Feb 2010 14:54:04 +0100 From: Enrico Forestieri To: cygwin@cygwin.com Subject: Re: select() and named pipes Message-ID: <20100216135404.GA2380@GIOVE> References: <20091222224309.GA3504@GIOVE> <20091223003714.GA4491@ednor.casa.cgf.cx> <20091223021219.GA5836@GIOVE> <20100103165846.GA3284@GIOVE> <20100103191121.GA17057@ednor.casa.cgf.cx> <20100215015427.GB5207@ednor.casa.cgf.cx> <20100216012055.GA7936@GIOVE> <20100216031655.GC17979@ednor.casa.cgf.cx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100216031655.GC17979@ednor.casa.cgf.cx> User-Agent: Mutt/1.5.20 (2009-06-14) 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 Mon, Feb 15, 2010 at 10:16:55PM -0500, Christopher Faylor wrote: > On Tue, Feb 16, 2010 at 02:20:55AM +0100, Enrico Forestieri wrote: > >On Sun, Feb 14, 2010 at 08:54:27PM -0500, Christopher Faylor wrote: > > > >> I just checked in YA in my series of attempts to get this working right. > >> It will behave marginally better now but there are still problems if you > >> attempt to write to a fifo before anything is reading it and then try to > >> do a non-blocking read. > > > >Thank you for your efforts. It indeed works better with the 2010-02-15 > >snapshot. > > > >In order to help you pinpointing another glitch, I attach here a slightly > >slightly modified version of the original test case and a shell script. > >Launching the program in a terminal and then the shell script in another > >one, it seems that the program hangs on the write() call. > >Apparently, the problem is the O_RDWR flag, as replacing it with O_WRONLY, > >everything works. The test case works with O_RDWR both in cygwin 1.5 and > >linux. > > Yes, non-blocking writes are not working. They never really were, in fact. Please, note that the write fails when using O_RDWR instead of O_WRONLY. In the test case, O_NONBLOCK is not used. -- Enrico -- 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