VINTR
termios->c_cc[VINTR] = v.c_cc[_VINTR];
v.c_cc[_VINTR] = termios->c_cc[VINTR];
tmp.t_intrc = tty->termios.c_cc[VINTR];
tty->termios.c_cc[VINTR] = tmp.t_intrc;
[VINTR] = 'C'-0x40, \
#define INTR_CHAR(tty) ((tty)->termios.c_cc[VINTR])