linux-kernel - signal to PID 1 from serial console like KeyboardRequest or CAD

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Message-ID: <4D8CD3D4.90900@coplanar.net>
Date:	Fri, 25 Mar 2011 13:41:40 -0400
From:	Jeremy Jackson <jerj@...lanar.net>
To:	linux-kernel@...r.kernel.org
Subject: signal to PID 1 from serial console like KeyboardRequest or CAD

Hi,

Sent to linux-console with no reply for over a week...

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
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