login_tty
if (login_tty(fd) == -1) {
int login_tty(int);
login_tty(slave);
if (login_tty(i) < 0) {
if (login_tty(i) < 0) {
login_tty(int),
if (login_tty(t) == -1)
if (login_tty(fd) == -1) {
login_tty(slavefd);
login_tty(slave);