#!/bin/sh

watchdog_kick() {
	while true; do
		for wd in /dev/watchdog*; do
			[ -c $wd ] && echo X > $wd
		done
		[ -z "$1" ] && sleep 10s || exit
	done
}

if [ -z "$1" ]; then
	watchdog_kick
else
	if [ "$1" != "-1" ]; then
		echo "Invalid argument"
		exit 1
	fi
	watchdog_kick $1
fi