Messages in this thread | | | Date | Fri, 01 Apr 2011 11:47:10 -0400 | From | Jeremy Jackson <> | Subject | Re: signal to PID 1 from serial console like KeyboardRequest or CAD |
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On 04/01/2011 11:42 AM, Randy Dunlap wrote: > On Fri, 01 Apr 2011 11:39:28 -0400 Jeremy Jackson wrote: > >> On 04/01/2011 01:37 AM, Dmitry Torokhov wrote: >>> 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. >> >> The VGA console/keyboard isn't an issue here, C_A_D works great. The >> problem is, that functionality isn't available when using *serial* console. > > That's why I asked whether it could be an issue with the serial interface > software. E.g., minicom handles/processes certain keystrokes, other apps do things > differently, etc...
OK I guess I should clarify... when using Linux serial console, you can send BREAK <letter> to use SysRq functions. In minicom, META-F sends break. This works fine for all the existing functions linux offers, r = reboot immediate, i = kill all tasks, etc. But, there is no function available to reboot *clean*, or to signal PID 1 (/sbin/init) to do same. So, minicom is working/configured properly, Linux just doesn't offer a feature similar to C_A_D via serial.
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