ring_buffer_user_read
ssize_t ring_buffer_user_read(struct ring_buffer *buffer, uint8 *data, ssize_t length);
return ring_buffer_user_read(fBuffer, (uint8*)buffer, size);
ring_buffer_user_read(fRingBuffer, (uint8 *)buffer, length);
ring_buffer_user_read(port->rbuf, (uint8*)buf, 1);
bytesRead = ring_buffer_user_read(fBuffer, (uint8*)data, size);