与网络断开连接时创建 adhoc 网络

Question

我正在使用 ArchLinux，并且想在家庭网络连接断开（或启动时无法连接到家庭网络）时自动创建 AdHoc 网络。我该如何实现？

我在互联网上发现这可以解决启动时的问题，但不能解决网络断开连接时的问题：

# RPi Network Conf Bootstrapper

createAdHocNetwork(){
    echo "Creating ad-hoc network"
    ifconfig wlan0 down
    iwconfig wlan0 mode ad-hoc
    iwconfig wlan0 key aaaaa11111 #WEP key
    iwconfig wlan0 essid RPi      #SSID
    ifconfig wlan0 10.0.0.200 netmask 255.255.255.0 up
    /usr/sbin/dhcpd wlan0
    echo "Ad-hoc network created"
}

echo "================================="
echo "RPi Network Conf Bootstrapper 0.1"
echo "================================="
echo "Scanning for known WiFi networks"
ssids=( 'MyWlan' 'MyOtherWlan' )
connected=false
for ssid in "${ssids[@]}"
do
    if iwlist wlan0 scan | grep $ssid > /dev/null
    then
        echo "First WiFi in range has SSID:" $ssid
        echo "Starting supplicant for WPA/WPA2"
        wpa_supplicant -B -i wlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf     > /dev/null 2>&1
        echo "Obtaining IP from DHCP"
        if dhclient -1 wlan0
        then
            echo "Connected to WiFi"
            connected=true
            break
        else
            echo "DHCP server did not respond with an IP lease (DHCPOFFER)"
            wpa_cli terminate
            break
       fi
    else
        echo "Not in range, WiFi with SSID:" $ssid
    fi
done

if ! $connected; then
    createAdHocNetwork
fi

exit 0

wicd另一边提供（前/后）（dis）连接脚本，但我不知道启动