From: luke gruber <luke.gru@...>
Date: 2011-10-14T23:55:38+09:00
Subject: Re: Signal handling cross-platform

>trap an OS signal that the host is shutting down, allowing Ruby to tidy >some 
things up first.

For unix-like OS's, when the computer is shutting down all processes are 
sent a SIGTERM, so if you use the the trap method (defined in the Kernel 
module) like this,

trap("TERM") do
...important stuff...
...
end

it should work. For other OS's, just find out what signals are sent on 
shutdown, and see if they match the signals recognized by your Ruby 
version by matching them against the output of Signal.list().

Hope this helps,

-Luke

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