module Mixlib::ShellOut::Unix

def attempt_buffer_read
  ready = IO.select(open_pipes, nil, nil, READ_WAIT_TIME)
  if ready
    read_stdout_to_buffer if ready.first.include?(child_stdout)
    read_stderr_to_buffer if ready.first.include?(child_stderr)
    read_process_status_to_buffer if ready.first.include?(child_process_status)
  end
  ready
end