EAGAIN error is eaten by Castle

[davidshen84]

var ctx = new Context();
// setup a pusher and puller

puller.SetOption(SocketOpt.RCVTIMEO, 500);
try {
  while(true) {
    var bytes = puller.Recv();
    // use bytes
  }
} catch (ZmqException) {}

With the above code, instead of getting a ZmqException, I got a normal system exception.

System.ArgumentNullException: Array cannot be null.

I think the problem is at this line. According to zmq doc, the EAGAIN error code is given if the ZMQ_RCVTIMEO options is set and the socket failed to receive the message within the specified time.