IXANY
if (ts->c_iflag & IXANY)
if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
if (termios->c_iflag & IXANY)
iflag_mask |= IXANY|IXON|IXOFF;
ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
#define I_IXANY(tty) _I_FLAG((tty), IXANY)