path: rear_2.9+dfsg-3/usr/share/rear/lib/linux-functions.sh
    # as first fallback do what start_udev does on RHEL 4
    if has_binary udevstart ; then
        local udevd_pid=$( pidof -x udevd )
        test "$udevd_pid" && kill $udevd_pid
        udevstart </dev/null &>/dev/null && return 0