how to detect a buffer over run on serial port in linux using c++

Question

I have a big problem. At present I am accessing a serial port via the following hooks:

fd = open( \"/dev/ttyS1\", O_RDWR | O_NOCTTY )

then

Answer 1

According to the kernel sources, you should use the TIOCGICOUNT ioctl. The third ioctl argument should be a pointer to the following struct, defined in <linux/serial.h> :

/*
 * Serial input interrupt line counters -- external structure
 * Four lines can interrupt: CTS, DSR, RI, DCD
 */
struct serial_icounter_struct {
        int cts, dsr, rng, dcd;
        int rx, tx;
        int frame, overrun, parity, brk;
        int buf_overrun;
        int reserved[9];
};

I don't know if every driver detect all conditions however.

Answer 2

Dark Templer,

Your serial driver should update the icount.frame/overrun errors.

struct uart_port in serial_core.h has member struct uart_icount, which should be updated in platform serial device driver as per interrupts received.