From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Jackson Subject: signal to PID 1 from serial console like KeyboardRequest or CAD Date: Fri, 11 Mar 2011 08:43:52 -0500 Message-ID: <4D7A2718.5090607@coplanar.net> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-console-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: linux-console@vger.kernel.org Hi, I ran into a problem recently on a Linux server with a remote serial console. /sbin/init (actually Upstart) was in a state where nothing (useful) was running. I had to power cycle the machine to get back to the boot prompt. This has the side-effect of triggering raid rebuilds. It would be nice to have what Ctrl-Alt-Del does at the VGA console with PS/2 or USB keyboard. This sends a SIGINT to PID 1, and most distros have this set to do "shutdown -r now" which attempts a clean reboot. Once upon a time there was KeyboardRequest, which would send a SIGWINCH to PID 1 (when pressing Alt-UP_arrow?). I don't see any sign of this feature in Linux 2.6.32 though. Looking at the Sysrq handlers in the kernel I don't see any keystrokes that send SIGINT to PID 1 either. So, I'm wondering if it makes sense to add a Sysrq key to send a signal to PID1 ? -- Coplanar Networks http://www.coplanar.net (519)489-4903