// sleepyd.c -- sleeps, and restarts self if given the HUP signal

#include <err.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

// an exec from a signal handler may be problematic (especially if
// signal masks and a fork is involved) so instead we only flag that a
// restart needs to happen
volatile sig_atomic_t Restart_Self;
void
handler(int sig)
{
	Restart_Self = 1;
}

int
main(int argc, char *argv[])
{
	// probably a daemon should have this
	//if (chdir("/") == -1) err(1, "chdir");
#ifdef __OpenBSD__
	if (pledge("exec stdio", NULL) == -1) err(1, "pledge failed");
#endif
	signal(SIGHUP, handler);
	fprintf(stderr, "sleepy time for %d\n", getpid());
	while (1) {
		sleep(INT_MAX);
		if (Restart_Self) {
			execv(*argv, argv);
			err(1, "execv failed '%s'", *argv);
		}
	}
	exit(EXIT_FAILURE);
}