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From: Emanuel Berg <embe8573@student.uu.se>
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Subject: execute defun on reception of signal
Date: Sun, 12 Jul 2015 03:59:28 +0200
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I read somewhere you can do it like this:

    (defun usr1-handler ()
      (interactive)
      (message "Got usr1 signal."))
      
    (global-set-key [signal usr1] 'usr1-handler)

However if the Emacs PID is 2592,

    $ kill -s usr1 2592

doesn't do it.

-- 
underground experts united
http://user.it.uu.se/~embe8573