func recv(mq *sysv_mq.MessageQueue) (offset, size int, err error) {
data, _, e := mq.ReceiveBytes(1, 0)
if err != nil {
err = e
return
}
if len(data) < 16 {
err = fmt.Errorf("expected offset and size")
return
}
offset = int(binary.BigEndian.Uint64(data[:8]))
size = int(binary.BigEndian.Uint64(data[8:]))
return
}
