From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756130Ab2CYOwJ (ORCPT ); Sun, 25 Mar 2012 10:52:09 -0400 Received: from lxorguk.ukuu.org.uk ([81.2.110.251]:39716 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756102Ab2CYOwH (ORCPT ); Sun, 25 Mar 2012 10:52:07 -0400 Date: Sun, 25 Mar 2012 15:51:43 +0100 From: Alan Cox To: Al Viro Cc: Richard Weinberger , Jiri Slaby , linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, Jiri Slaby Subject: Re: TTY: tty_port questions Message-ID: <20120325155143.7ca7cb13@ultron> In-Reply-To: <20120324232001.GK6589@ZenIV.linux.org.uk> References: <4F5BD51B.7030907@nod.at> <4F5BDB09.3020407@suse.cz> <4F5BE1E6.9000201@nod.at> <4F5C861F.2000507@nod.at> <4F5DCF39.8080308@nod.at> <20120312105312.665d2362@pyramind.ukuu.org.uk> <4F5DDAD4.4060504@nod.at> <20120312114832.784bb6fe@pyramind.ukuu.org.uk> <20120324232001.GK6589@ZenIV.linux.org.uk> X-Mailer: Claws Mail 3.8.0 (GTK+ 2.24.8; x86_64-redhat-linux-gnu) Face: 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 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 24 Mar 2012 23:20:01 +0000 Al Viro wrote: > On Mon, Mar 12, 2012 at 11:48:32AM +0000, Alan Cox wrote: > > > > > It will be. In order to fix the tty locking mess we need to shove a lot > > > > of stuff whose lifetime is the lifetime of the physical port somewhere > > > > else - the tty_port is that structure. > > > > > > > > > > "It will be" in terms of "not now"? ;-) > > > > As in, it's the very next step on. > > FWIW, uml console in default config is basically "start xterm for each VC". > What do you suggest to do on vhangup() on one of those? What posix says must happen. Which is that the running processes get a hangup. So a vhangup() would ensure there were no old apps on the UML guess talking to the xterm (eg stealing login credentials, or abusing TIOCSTI etc). The fact it's an xterm isn't really relevant. That's just the physical interface and vhangup is about breaking the logical link. The xterm would continue, no reason for it to do otherwise I can see ? Alan