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SubjectRe: signal to PID 1 from serial console like KeyboardRequest or CAD
On Fri, 25 Mar 2011 13:41:40 -0400 Jeremy Jackson wrote:

> 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.

so C_A_D works at console via PS/2 or USB keyboard, but not on a remote
serial console? Could it be an issue with whatever remote/serial software
you are using?

> 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.

I couldn't find it in 2.4.37 either.

Can 'loadkeys' help you any?

> 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 ?

Dmitry, any ideas?


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***


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