X-Recipient: archive-cygwin AT delorie DOT com X-Spam-Check-By: sourceware.org Date: Mon, 9 Mar 2009 22:48:50 -0400 From: Christopher Faylor To: cygwin AT cygwin DOT com Subject: Re: minTTY will not interrupt 'locked' process Message-ID: <20090310024849.GA17042@ednor.casa.cgf.cx> Reply-To: cygwin AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com References: <49B58491 DOT 5080101 AT columbus DOT rr DOT com> <416096c60903091432w1c4b2d2fjc1cf23896fd8ef9d AT mail DOT gmail DOT com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <416096c60903091432w1c4b2d2fjc1cf23896fd8ef9d@mail.gmail.com> User-Agent: Mutt/1.5.16 (2007-06-09) 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 Mon, Mar 09, 2009 at 09:32:36PM +0000, Andy Koppe wrote: >> Several times recently, I have executed a command on a "file" that was >> apparently "locked". ?Any attempts to perform any reads/opens on the file >> would block. ?When it happens, the only was out is to terminate minTTY >> session (no ctl-C or ctl-\ will terminate). ?Is this a normal situation? > >I'm afraid I don't know about those locked files, but in any case this >sounds more like a general Cygwin question. When you press Ctrl-C or >Ctrl-\, MinTTY simply writes the corresponding control character to >the pty device connecting it to its child process. The terminal driver >normally turns that into a SIGINT or SIGQUIT, but applications can >override that, or choose to ignore signals. Also, Cygwin can't deliver >signals while a program is executing a Win32 function. Right. If a process is blocked in a situation where Cygwin isn't expecting it, like when reading a disk file, then signals won't have much effect. This is actually more than a little like what happens Linux when you try to access a file on, say, a bad disk. Signals don't allow you to stop the process there either. cgf -- 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/