/* See LICENSE file for copyright and license details. */
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>

void boot(void);
void shut(char);

int main(void)
{
	int sig;
	sigset_t set;
	size_t i;

	if (getpid() != 1)
		return 1;

	chdir("/");

	sigfillset(&set);
	sigprocmask(SIG_BLOCK, &set, NULL);

	nice(15);
	boot();

restart:
	while (1)
	{
		sigwait(&set, &sig);

		switch (sig)
		{
		case SIGUSR1:
			shut('p');
			goto restart;
		case SIGCHLD:
		case SIGALRM:
			while (waitpid(-1, NULL, WNOHANG) > 0)
				;
			goto restart;
		case SIGINT:
			shut('r');
			goto restart;
		}
	}

	/* not reachable */
	return 0;
}