SER_DCD
| (!(status & SER_DCD) ? TIOCM_CAR : 0)
if(!(status & SER_DCD))
return !(ciab.pra & SER_DCD);
ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
if (dstatus & SER_DCD) {
if (tty_port_check_carrier(port) && (dstatus & SER_DCD)) {
(!(status & SER_DCD)) ? "on" : "off");
if (!(status & SER_DCD))
current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);