[gentoo-embedded] displaying serial port status

Gretings,

In the old days when we used direct port I/O to perform serial port actions, code like the following would display the port's status:

#define BASE    0x03F8     /* COM1 port base address */
#define LS_REG (BASE+5)    /* Line Status Register   */

void ShowLineStatus(void)
{
    int status = inportb(LS_REG);
    if (status & 0x02) printf("Overrun Error\n");
    if (status & 0x04) printf("Parity Error\n");
    if (status & 0x08) printf("Framing Error\n");
    if (status & 0x10) printf("Break Interrupt\n");
    if (status & 0x80) printf("Timeout Error\n");
}

How does one perform the same thing for /dev/ttyS0 (or any other serial port)?

I've been looking at various ioctl's, but haven't yet spotted one that provides information on overrun errors, parity errors, etc.

Thanks in advance!
 
David