int main(int argc, char *argv[])
{
int fdtty1;
signal(SIGINT, SIG_IGN);
signal(SIGUSR1, sigusr1);
/* remove any stale /etc/mtab file */
unlink("/etc/mtab");
/* clean up anything handed to us by the kernel */
close(0);
close(1);
close(2);
/* loop until we can open the first terminal */
do {
fdtty1 = open("/dev/tty1", O_RDWR|O_NOCTTY);
} while (fdtty1 < 0);
/* make stdin, stdout and stderr point to /dev/tty1 */
if (fdtty1 != 0)
close(0);
dup(fdtty1);
close(1);
dup(fdtty1);
close(2);
dup(fdtty1);
putstr("init version 0.9.0ac#1\n");
close(open("/var/run/utmp", O_WRONLY | O_CREAT | O_TRUNC));
load_inittab();
parse_inittab();
boot_runlevel();
for (;;) {
clear_zombies(0);
if (dingdong) {
uint8_t newrl;
int fd = open("/var/run/intctl", O_RDONLY);
if (fd != -1 && read(fd, &newrl, 1) == 1) {
exit_runlevel(1 << runlevel, 1 << newrl);
runlevel = newrl;
enter_runlevel(1 << runlevel);
}
close(fd);
dingdong = 0;
}
}
}
/*
* Clear up the tasks that should not be running. Start with a HUP then
* probe them allowing up to 45 seconds, after which we send SIGKILL
*/
static void exit_runlevel(uint8_t oldmask, uint8_t newmask)
{
uint8_t n = 0;
if (cleanup_runlevel(oldmask, newmask, SIGHUP)) {
while (n++ < 9) {
sleep(5);
clear_zombies(WNOHANG);
if (cleanup_runlevel(oldmask, newmask, 0) == 0)
return;
}
cleanup_runlevel(oldmask, newmask, SIGKILL);
}
}