X-Spam-Check-By: sourceware.org Date: Wed, 27 Sep 2006 22:13:36 -0400 From: Christopher Faylor To: cygwin@cygwin.com Subject: Re: tcgetattr problem Message-ID: <20060928021335.GD31675@trixie.casa.cgf.cx> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <20060927193049.GA29552@flixx.linux.bogus> <20060927231017.GC29552@flixx.linux.bogus> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060927231017.GC29552@flixx.linux.bogus> User-Agent: Mutt/1.5.11 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk 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 Thu, Sep 28, 2006 at 12:10:18AM +0100, ahnkle wrote: >On 18:36 Wed 27 Sep , Igor Peshansky wrote: >> >> #define PORT "com1" >> ... >> fd = open(PORT, O_RDWR | O_NOCTTY ); >> >> There's your problem. When you open a port as "com1", it looks like a >> file to Cygwin, since it doesn't recognize it as a valid device name. >> Thus any attempt to manipulate that fd as a device will fail. >> >> Use the Cygwin device (e.g., "/dev/ttyS0"). > >Strangely, com1 *does* work in the call to open. Having tried "/dev/ttyS0", >tcgetattr() works ok. "It looks like a file to Cygwin" >I also note that read() and write() work ok too using "com1", but >tcsetattr() also fails. "It looks like a file to Cygwin" >BTW, I obtained the CVS source, but couldn't find the _ioctl() call >anywhere in my (brief) grepping. Is there any documentation about internal >structure, and whats going on under the hood? The name of the function is "ioctl", not "ioctl". -- 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/