popen_subprocess.rb

require 'open3'
require 'timeout'

def subprocess_sleep(seconds)
  Open3.popen3("sleep #{seconds}")
end

begin
  Timeout.timeout(2) do 
    stdin, stdout, stderr, wait_thr = subprocess_sleep(3)
    @pid = wait_thr.pid
    Process.wait(@pid)
  end
rescue Timeout::Error
  puts "Sleep PID: #{@pid}"
  Process.kill 9, @pid
end