From: Brian Candler <b.candler@...>
Date: 2009-02-19T23:25:20+09:00
Subject: Re: a little daemon daemonizes, but hangs the logout

Jeff Moore wrote:
> There is a perfectly serviceable Daemon class in lib/webrick/server.rb 
> as well.
> 
> You can use it as is, or as a template for your own code.

And there is this one from rackup (part of the rack package)

if daemonize
  if RUBY_VERSION < "1.9"
    exit if fork
    Process.setsid
    exit if fork
    Dir.chdir "/"
    File.umask 0000
    STDIN.reopen "/dev/null"
    STDOUT.reopen "/dev/null", "a"
    STDERR.reopen "/dev/null", "a"
  else
    Process.daemon
  end

  if pid
    File.open(pid, 'w'){ |f| f.write("#{Process.pid}") }
    at_exit { File.delete(pid) if File.exist?(pid) }
  end
end
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