cat RunCache
#!/bin/sh
#
# RunCache      Run squid, restart it if it died.
#               This is overly cautious - with new versions of
#               squid, it just doesn't die. Oh well.
#
# Version:      @(#)RunCache  2.00  17-Dec-1998  miquels@cistron.nl
#

#
#       Squid gets run with the arguments passed to "RunCache".
#       Set some defaults args if none were passed. If a filename
#       was passed, treat it as configfile location (backwards compat).
#
case "$1" in
        "")
                set -- -s
                ;;
        /*)
                set -- -s "$1"
                ;;
esac

PIDFILE=/var/run/runcache.pid
PATH=/usr/lib/squid:/bin:/sbin:/usr/sbin:/usr/bin:/usr/local/squid/bin
L=/var/log/squid/squid.out
export PATH
umask 022

#
#       Just to be sure, check if squid is not already running.
#
if [ -f /var/run/squid.pid ]
then
        spid=`cat /var/run/squid.pid`
        kill -CONT $spid 2>/dev/null
        if [ $? = 0 ]
        then
                #echo "RunCache: squid is already running." >&2
                exit 0
        fi
fi

rm -f $PIDFILE
echo $$ > $PIDFILE

failcount=0
while : ; do
        exec >>$L 2>&1 0</dev/null # (Re) open logfile
        echo "`date`: Running: squid -D -s $conf"
        start=`date '+%d%H%M%S'`
        squid "$@"
        exec >>$L 2>&1 0</dev/null # Re-open logfile
        stop=`date '+%d%H%M%S'`
        t=`expr $stop - $start`
        if test 0 -le $t -a $t -lt 5 ; then
                failcount=`expr $failcount + 1`
        else
                failcount=0
        fi
        if test $failcount -gt 5 ; then
          echo "`date`: RunCache: EXITING DUE TO REPEATED FREQUENT FAILURES"
          exit 1
        fi
        sleep 10
done