RD_INT_FIFO_SIZE
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE);
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE) ==
(RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE);
unsigned char rd_msg_fifo[RD_INT_FIFO_SIZE * IPC_PAYLOAD_SIZE];