nonblock=

# File ext/io/wait/lib/nonblock.rb, line 7
  def nonblock=(nb)
    f = fcntl(Fcntl::F_GETFL)
    if nb
      f |= File::NONBLOCK
    else
      f &= ~File::NONBLOCK
    end
    fcntl(Fcntl::F_SETFL, f)
  end