def read(self, n, timeout_sec):
self._port.timeout = timeout_sec
to_return = self._port.read(n)
if not to_return:
raise server.IoTimeoutError()
return to_return
def _await_ready(self, rlist, wlist, timeout_sec=None, end_time=None):
if timeout_sec is None and end_time is not None:
timeout_sec = max(0, end_time - time.monotonic())
rlist, wlist, xlist = select.select(rlist, wlist, rlist + wlist,
timeout_sec)
if not rlist and not wlist and not xlist:
raise server.IoTimeoutError()
return True
