aredn/files/usr/local/bin/clean_zombie.sh

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#!/bin/sh
true <<'LICENSE'
Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
Copyright (C) 2018 Joe Ayers AE6XE
See Contributors file for additional contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation version 3 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Additional Terms:
Additional use restrictions exist on the AREDN(TM) trademark and logo.
See AREDNLicense.txt for more info.
Attributions to the AREDN Project must be retained in the source code.
If importing this code into a new or existing project attribution
to the AREDN project must be added to the source code.
You must not misrepresent the origin of the material contained within.
Modified versions must be modified to attribute to the original source
and be marked in reasonable ways as differentiate it from the original
version.
LICENSE
# Look for hung 'iw' zombie processes prone to hang
# when available memory is low.
zombiepid="/tmp/clean_zombie.pid"
[ -e $zombiepid ] && [ -d "/proc/$(cat $zombiepid)" ] && exit
echo "$$" > $zombiepid
# wait for rssi_monitor and snrlog to run
sleep 20;
for pid in $(ps | grep -E "^\s*\d+\s+root\s+\d+\s+Z\s+\[iw\]"| sed -e "s/^\s*//"| cut -f1 -d\ )
do
# found an "iw" zombie
sleep 10 # in case process is naturally closing and needs more time
if [ -d "/proc/$pid" ] ; then
date >> /tmp/zombie.log
ps | grep -E "^\s*${pid}\s+" | grep -v grep | tail -1 >> /tmp/zombie.log
ppid="$(grep -i ppid < /proc/"$pid"/status | cut -f2)"
if [ -d "/proc/$ppid" ] ; then
ps | grep -E "^\s*${ppid}\s+" | grep -v grep | tail -1 >> /tmp/zombie.log
grep crond /proc/"$ppid"/status 2>&1 > /dev/null
if [ $? -ne 0 -a "$ppid" -gt 1 ]; then
# kill the zombie's parent process to free up resources
kill -9 "$ppid" 2>&1 >> /tmp/zombie.log
echo "Killed $ppid" >> /tmp/zombie.log
if [ "$(wc -l /tmp/zombie.log | cut -f1 -d\ )" -gt 300 ] ; then
# keep file size in check
cp /tmp/zombie.log /tmp/zombie.tmp
tail -275 /tmp/zombie.tmp > /tmp/zombie.log
rm -f /tmp/zombie.tmp
fi
fi
fi
echo "" >> /tmp/zombie.log
fi
done
rm $zombiepid