#!/usr/bin/env python3
import os
import signal
import time

path = os.environ.get("LESAVKA_WATCHDOG_DEV", "/dev/watchdog")
interval = float(os.environ.get("LESAVKA_WATCHDOG_INTERVAL", "5"))

fd = os.open(path, os.O_WRONLY)

running = True


def handle(_sig, _frame):
    global running
    running = False


signal.signal(signal.SIGTERM, handle)
signal.signal(signal.SIGINT, handle)

try:
    while running:
        os.write(fd, b"\0")
        time.sleep(interval)
finally:
    try:
        os.write(fd, b"V")
    except Exception:
        pass
    os.close(fd)