From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262173AbVFILmR (ORCPT ); Thu, 9 Jun 2005 07:42:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262356AbVFILmR (ORCPT ); Thu, 9 Jun 2005 07:42:17 -0400 Received: from web25807.mail.ukl.yahoo.com ([217.12.10.192]:29779 "HELO web25807.mail.ukl.yahoo.com") by vger.kernel.org with SMTP id S262173AbVFILly (ORCPT ); Thu, 9 Jun 2005 07:41:54 -0400 Message-ID: <20050609114149.60315.qmail@web25807.mail.ukl.yahoo.com> Date: Thu, 9 Jun 2005 13:41:49 +0200 (CEST) From: moreau francis Subject: Re: [TTY] exclusive mode question To: Frederik Deweerdt Cc: Frederik Deweerdt , linux-kernel@vger.kernel.org In-Reply-To: <20050609104140.GB507@gilgamesh.home.res> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --- Frederik Deweerdt a écrit : > > > I've just greped and I found : > > > > > > if (!retval && test_bit(TTY_EXCLUSIVE, &tty->flags) && > > > !capable(CAP_SYS_ADMIN)) > > > retval = -EBUSY; > > > in drivers/char/tty_io.c:tty_open > > > > > > Which sources are you looking at? > > > > > > > same source code but if another process has previously open the tty, how > does > > this source code detect it ? > > > Sorry I misunderstood your question, there's no check on previous opens: > from man tty_ioctl: > > TIOCEXCL void > Put the tty into exclusive mode. No _further_ open(2) > operations on the terminal are permitted. > (They will fail with EBUSY, except for root.) > oh ok...sorry I misunderstood TIOEXCL meaning ;) Do you know how I could implement such exclusive mode (the one I described) ? thanks Francis _____________________________________________________________________________ Découvrez le nouveau Yahoo! Mail : 1 Go d'espace de stockage pour vos mails, photos et vidéos ! Créez votre Yahoo! Mail sur http://fr.mail.yahoo.com/