X-Recipient: archive-cygwin AT delorie DOT com X-SWARE-Spam-Status: No, hits=-1.8 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,RCVD_IN_DNSWL_NONE,UNPARSEABLE_RELAY X-Spam-Check-By: sourceware.org X-Yahoo-SMTP: jenXL62swBAWhMTL3wnej93oaS0ClBQOAKs8jbEbx_o- Date: Tue, 11 Oct 2011 13:08:34 -0400 From: Christopher Faylor To: cygwin AT cygwin DOT com Subject: Re: Problem redirecting stderr to pipe in subprocess Message-ID: <20111011170834.GA4522@ednor.casa.cgf.cx> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <4E906DD1 DOT 50107 AT cornell DOT edu> <4E90C308 DOT 9090508 AT cornell DOT edu> <20111009235815 DOT GA18203 AT ednor DOT casa DOT cgf DOT cx> <20111010220608 DOT GA1568 AT ednor DOT casa DOT cgf DOT cx> <20111011121742 DOT GC21554 AT calimero DOT vinschen DOT de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20111011121742.GC21554@calimero.vinschen.de> User-Agent: Mutt/1.5.20 (2009-06-14) Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , 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 Tue, Oct 11, 2011 at 02:17:42PM +0200, Corinna Vinschen wrote: >On Oct 10 18:06, Christopher Faylor wrote: >> When the tty layer in Cygwin was first developed, the model (either in >> my head or in reality) was "If you don't have a tty and open a tty, that >> becomes your controlling tty". But, apparently that model changed over >> time to something more sensical where you have to explicitly use >> ioctl(TIOCSCTTY) to set up a controlling terminal. > >I don't quite understand this. The "If you don't have a tty and open a tty, >that becomes your controlling tty" is standard POSIX behaviour, isn't it? >SUSv4 open writes: > > O_NOCTTY > > If set and path identifies a terminal device, open() shall not > cause the terminal device to become the controlling terminal for > the process. If path does not identify a terminal device, > O_NOCTTY shall be ignored. > >The Linux man page contains basically the same. Check out the linux info page. It's more talkative. cgf -- 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