module Process

  # Turns the current script into a daemon process
  # that detaches from the console. It can be shut
  # down with a TERM signal.
  #
  # CREDIT: David Heinemeier Hansson

  def self.daemon(nochdir=nil, noclose=nil)
    exit if fork # Parent exits, child continues.
    Process.setsid # Become session leader.
    exit if fork # Zap session leader. See [1].

    unless nochdir
      Dir.chdir "/" # Release old working directory.
    end

    File.umask 0000 # Ensure sensible umask. Adjust as needed.

    unless noclose
      STDIN.reopen "/dev/null" # Free file descriptors and
      STDOUT.reopen "/dev/null", "a" # point them somewhere sensible.
      STDERR.reopen '/dev/null', 'a'
    end

    trap("TERM") { exit }

    return 0
  end unless respond_to?(:daemon)

end