Re: Post-shutdown hook for UPS shutdown?

[Warner Losh]

You'd like have to hack the kernel.  There are hooks in the kernel to
execute very late in the game.  I even think there is one to do things
just before halt that you could use to power things off completely.
If this is a UPS, and the signal is several serial characters, you'd
have to poll the serial port rather than using interrupts (and you
should disable interrupts just in case).

Warner


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