From: Jos Backus <jos@...>
Date: 2009-03-25T05:11:16+09:00
Subject: Re: Looking for a method to kill all children for my	Timeout::Error contingency

On Wed, Mar 25, 2009 at 04:57:03AM +0900, Xeno Campanoli wrote:
> Do I really need to collect all the pids from fork to kill them in that case, or 
> is there a method I'm not finding in pickaxe that just does it???

Here's a trick I use, maybe it is useful. Note that even if push-to-slaves
creates children, those too will be killed because they reside in the same
process group.

  require 'timeout'
  signal = '-TERM'
  timeout = 30

  pid = Process.fork do
    Process.setsid
    exec %{push-to-slaves -v}
  end
  begin
    Timeout::timeout(timeout) { Process.waitpid(pid) }
  rescue Timeout::Error => exc
    puts "#{exc.message}, killing pid #{pid}"
    Process.kill(signal, pid)
    res = Process.waitpid(pid)
    puts "pid #{pid.inspect} != res #{res.inspect}" if res != pid
  end

-- 
Jos Backus
jos at catnook.com