Moxa Technologies C360 manual Read the length of data queued in Rx buffer, Get modem line status

For UNIX Users ∙			∙ Chapter 4
int	sio_flush(int port, int func)
return	=	0	ok
		-1	bad port
		-2	time out
		-5	port is not open
port	=	port number
func	=	flush function (clear the assigned queue)
		0	for input queue
		1	for output queue

2for input & output queue

9.Read the length of data queued in Rx buffer.

long	sio_iqueue(int port)
return	=	>0	input queue size(bytes)
		-1	bad port
		-2	time out
		-5	port is not open
port	=	port number

10. Read the length of data queued in Tx buffer.

long	sio_oqueue(int port)
return	=	>=0	length of transmitted data which still
			queued in Tx buffer
		-1	bad port
		-2	time out
		-5	port is not open
port	=	port number

11. Get modem line status.

int	sio_lstatus(int port)
return	= >0 line status : bit 0	-- S_CTS
	bit 1	-- S_DSR
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