taglinefilesource code
CRTSCTS1146drivers/char/serial.cif (cflag & CRTSCTS) {
CRTSCTS1770drivers/char/serial.cif ((old_termios->c_cflag & CRTSCTS) &&
CRTSCTS1771drivers/char/serial.c!(tty->termios->c_cflag & CRTSCTS)) {
CRTSCTS162include/linux/tty.h#define C_CRTSCTS(tty)  _C_FLAG((tty),CRTSCTS)