kms_functions

function killmesoftly {
    PID=$1
    echo -n "Now sending SIGTERM to PID ${PID}... "
    kill ${PID}
    [ 0 -ne "$?" ] && { echo "Could not kill process. You are probably not allowed to perform the operation"; exit 3; }

    # wait 15 seconds by default between SIGTERM and SIGKILL and between SIGKILL and abandon the operation.
    COUNT=0
    SIGKILL_SENT=1
    while kill -0 "${PID}" &>/dev/null; do
        sleep 0.2
        COUNT=$((COUNT+1))
        [ "${COUNT}" -gt 150 ] && SIGKILL_SENT && { echo "Could not stop. Probably stuck in kernel call. Abandoning the whole kill chain."; exit 2; }
        [ "${COUNT}" -gt 75 ] && { echo -n "didn't terminate, sending SIGKILL... "; kill -9 ${PID}; COUNT=0; SIGKILL_SENT=0; }
    done
    echo "killed successfully"
}

# return 0 if a PID exists, 1 in any other case (regardless of ps exit code)
function checkPsExists {
    PID=$1
    ps -p ${PID} >/dev/null
    [ 0 -eq $? ] && return 0
    return 1
}