Messages in this thread | | | From | Keith Owens <> | Subject | sysrq on serial consoles [was The Deadly `ping -f'] | Date | Tue, 27 Apr 1999 14:14:18 +1000 |
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On Mon, 26 Apr 1999 15:37:36 +0100 (BST), "Stephen C. Tweedie" <sct@redhat.com> wrote: >On Sat, 24 Apr 1999 11:58:33 -0400 (EDT), Bradley M Keryan ><keryan@andrew.cmu.edu> said: >> It sounds like you can still use your PC keyboard to press alt-sysrq. >You don't need multiple consoles enabled to get alt-sysrq. Alt-sysrq is >independent of the console settings: it is built into the keyboard >driver. Using the alt-sysrq combinations will generate normal kernel >prinkt output to the current console devices wherever they may be.
The original question was how to enter sysrq from a serial console. AFAICT, the only way of entering alt-sysrq is directly from a PC keyboard, I can see no way of doing it from a serial console. Proc handle_sysrq is only called from handle_scancode in keyboard.c. Serial consoles do not have scancodes.
So a question for the serial experts. How do you enter alt-sysrq on a serial console? Expecially if that console could be a dumb VT100 or an emulator running on Linux or even another OS entirely?
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