#!/bin/sh

# Code in this script is derived from OpenWRT
# GPLv2 License

kill_remaining() { # [ <signal> ]
	local sig="${1:-TERM}"
	echo -n "Sending $sig to remaining processes ... "

	local my_pid=$$
	local my_ppid=$(cut -d' ' -f4  /proc/$my_pid/stat)
	local my_ppisupgraded=
	grep -q upgraded /proc/$my_ppid/cmdline >/dev/null && {
		local my_ppisupgraded=1
	}
	
	local stat
	for stat in /proc/[0-9]*/stat; do
		[ -f "$stat" ] || continue

		local pid name state ppid rest
		read pid name state ppid rest < $stat
		name="${name#(}"; name="${name%)}"

		local cmdline
		read cmdline < /proc/$pid/cmdline

		# Skip kernel threads
		[ -n "$cmdline" ] || continue

		if [ $$ -eq 1 ] || [ $my_ppid -eq 1 ] && [ -n "$my_ppisupgraded" ]; then
			# Running as init process, kill everything except me
			if [ $pid -ne $$ ] && [ $pid -ne $my_ppid ]; then
				echo -n "$name "
				kill -$sig $pid 2>/dev/null
			fi
		else 
			case "$name" in
				# Skip essential services
				*procd*|*ash*|*init*|*ssh*|*dropbear*|*login*|*uhttpd*|*admin*|*sysupgrade*|*upgrade_kill_prep*|*olsr*|*ubusd*) : ;;

				# Killable process
				*)
					if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
						echo -n "$name "
						kill -$sig $pid 2>/dev/null
					fi
				;;
			esac
		fi
	done
	echo ""
}

kill_remaining TERM
sleep 3
kill_remaining KILL
sleep 1