How to propagate a signal through a collection of scripts?

Question

I have an collection of scripts which are controlled by a main one. I want to trap the signal ctrl+c in the main script and propagate it to the others.

Answer 1

MAIN PARENT SCRIPT HEADER BEFORE THE MAIN LOOP:::

#Catch control-c and clean up testd instances if necessary
cleanup () {
    clear
    echo "Caught Signal.  Shutting Down MAIN."
    if [ "$MAIN_on" -eq 1 ]
    then
    M_shutdown
    fi
    exit 1
  }

In the main body of the script, as you spawn subprocesses you maintain an array with the proc ids of each. To load the PID into the array set the value to last spawned process e.g. put the following after each sub-shell spawn.

proc_id_array[1]=$!

Contents of the M_shutdow would be something like...

M_shutdown () {

    if [ "$MAIN_on" -eq 1 ]
    then
    echo "Stopping Main"
    echo "shutting down active subscripts"
    count_proc_id=1


while [ "$count_proc_id" -lt "$max_proc_id" ]
        do

            kill ${proc_id_array[$count_proc_id]} > /dev/null 2>&1
            DATE=$(date +%m%d%y-%k:%M)
            echo "$DATE: ${proc_name_array[$count_proc_id]} \(PID: ${proc_id_array[$count_proc_id]}\) stopped." >> $logfile             
            proc_id_array[$count_proc_id]="A"
            count_proc_id=`expr $count_proc_id + 1`
        done


        echo "MAIN stopped"
        MAIN_on=0

        sleep 5
        else
        echo "MAIN already stopped."
        sleep 1
        fi
    }