Messages in this thread | | | Date | Thu, 31 Mar 2011 22:37:57 -0700 | From | Dmitry Torokhov <> | Subject | Re: signal to PID 1 from serial console like KeyboardRequest or CAD |
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On Thu, Mar 31, 2011 at 12:57:06PM -0700, Randy Dunlap wrote: > 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?
I believe it is simply a matter of console keymap and assigning "boot" value to the desired combination.
> > > 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?
We have SysRq bindings to unmount filesystems and reboot, isn't that enough?
-- Dmitry
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