aredn/files/usr/local/bin/upgrade_kill_prep

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#!/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 1
kill_remaining KILL