signals_trap_with_arg() {
    func="$1" ; shift
    for sig ; do
        echo "$func $sig"
        trap "$func $sig" "$sig"
    done
}

signals_wait_forever() {
    while true
    do
        tail -f /dev/null & wait ${!}
    done
}

signal_name_to_number() {
    SIGNAME="$1"
    trap -l | sed -nr "s/.*\b([0-9]+)\) $SIGNAME.*/\1/p"
}

signal_return_val() {
    SIGNAME="$1"
    SIGNUM=$(signal_name_to_number ${SIGNAME})
    echo "128 + $SIGNUM" | bc
}