From: Ross Bamford <rossrt@...>
Date: 2006-01-26T19:44:39+09:00
Subject: Re: ensure statement and signals

On Thu, 2006-01-26 at 07:06 +0900, tsuraan wrote:
> My test code is:
> 
> #!/usr/bin/env ruby
> begin
>   sleep(1000)
> ensure
>   p "hi there!"
> end
> 
> And I run the script and send it all sort of signals (quit, int, term,
> hup, etc).  Nothing makes the program print "hi there!"  Can this be
> done?
> 

Running your code and hitting Ctrl-C does give the expected behaviour,
as does sending an INT directly:

  [rosco@jukebox ruby]$ ruby term1.rb &
  [1] 28052
  [rosco@jukebox ruby]$ kill -INT 28052
  [rosco@jukebox ruby]$ 
  "hi there!"
  term1.rb:2:in `sleep': Interrupt
          from term1.rb:2

  [1]+  Exit 1                  ruby term1.rb

(I made it p "\nhi there!" to make the example clearer). If you wanted
to broaden your horizons a bit you could try trapping some signals and
raising exceptions yourself:

  trap('TERM') {
    raise "Terminated!"
  }

  begin
    sleep 1000
  rescue Exception => ex
    puts "\nGot #{ex}"
  ensure
    puts "hi there!"
  end

Running that gives:

  [rosco@jukebox ruby]$ ruby term2.rb &
  [1] 28088
  [rosco@jukebox ruby]$ kill -TERM 28088
  [rosco@jukebox ruby]$ 
  Got Terminated!
  hi there!

  [1]+  Done                    ruby term2.rb

Obviously it's pretty simplistic but maybe gives a starting point...

Hope that helps,
Ross

-- 
Ross Bamford - rosco@roscopeco.REMOVE.co.uk