From: Martin Hansen <mail@...>
Date: 2010-06-21T18:22:49+09:00
Subject: Re: How to print exit status to a log file?

Hm, I am not making myself clear :o( - It is the status of the ruby 
script at hand I want to log. $? is probably barking up the wrong tree 
and adding confusion. In Perl I would do this trapping the signal.

> trap in your Ruby script will trap signals for this process not the
> forked process - unless you use the block form of fork in which case I
> believe the child inherits all signal handlers.

#!/usr/bin/env ruby

signal = nil

trap("INT") { signal = "interupted"; exit }
#trap("TERM") { signal = "terminated"; exit }

at_exit { puts "Put this in logfile: #{signal}" }

sleep 5

I have two issues with this: I loose the stack trace that is normally 
printed to stderr (I still want that printed to stderr):

./test.rb:10:in `sleep': Interrupt
        from ./test.rb:10:in `<main>'


And I fail setting signal as a global variable (if that can be done?) so 
I can use it from within a class without getting errors like this:

in `block in <class:Biopieces>': undefined local variable or method 
`signal' for Biopieces:Class (NameError)



Cheers,


Martin
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