#!/bin/sh

### check to see if cisco678polld.sh is running, start if needed

#clear
#reset

### execution tracing ON
#set -x

DAEMON=cisco678polld.sh
DPATH=~/mon_rrd
DLOCK=/var/tmp/${DAEMON}.lock


### check lock file
cklock() {
    if [ -f ${1} ] ; then
        if [ -r ${1} ] ; then
            DPID=$( cat ${1} )
        else
            echo lock is not readable
        fi
    else
        echo lock does not exist
    fi
}


### check lock pid
cklockpid() {
    if [ ${1} ] ; then
        CKPID=$( ps ax |\
            grep ${1} |\
            grep -v 'grep' |\
            awk '{print $1}' )
        if [ ${CKPID} ] && [ ${1} -eq ${CKPID} ] ; then
            echo proc is running, lock is valid
        fi
    else
        echo lock pid does not exist 
    fi
}


### check for running procs by name
ckprox() {
    PSPIDZ=$( ps ax |\
        grep ${DAEMON} |\
        grep -v 'grep' |\
        awk '{print $1}' )
}


start_daemon() {
    ( ${DPATH}/${DAEMON} ) &
    cklock ${DLOCK}
    cklockpid ${DPID}
}


stop_daemon(){
    ### remove lock, script should exit on its own
    cklock ${DLOCK}
    cklockpid ${DPID}
    if [ -f ${DLOCK} ] ; then
        rm -fv ${DLOCK}
    fi
}


terminate_daemon() {
    cklock ${DLOCK}
    cklockpid ${DPID}
    kill -9 ${DPID}
}


exterminate_daemons() {
    ### EXTERMINATE! 
    ckprox ${DAEMON}
    for PID in PSPIDZ ; do
        kill -9 ${PID}
    done
}


case "${1}" in
    'start')
        start_daemon
    ;;
    'stop')
        stop_daemon
        terminate_daemon
    ;;
    'terminate')
        stop_daemon
        terminate_daemon
    ;;
    'exterminate')
        stop_daemon
        terminate_daemon
        exterminate_daemons
    ;;
    'restart')
        stop_daemon
        terminate_daemon
        start_daemon
    ;;
    *)
        echo "Usage: $0 {start|stop|terminate|exterminate|restart}"
    ;;
esac

### execution tracing OFF
set +x