SINGLE_USER
if (cur_state == SINGLE_USER ||
cur_state = SINGLE_USER;
(void) sigaddset(&act.sa_mask, SINGLE_USER);
(void) sigaction(SINGLE_USER, &act, NULL);
{ SINGLE_USER, MASKSU, 'S', LSEL_RUNLEVEL },
{ SINGLE_USER, MASKSU, 's', LSEL_RUNLEVEL },
if (init_signal == SINGLE_USER) {
cur_state = SINGLE_USER;