Create a request script.
The request script determines where the administrator wants the driver objects to be installed, by questioning the administrator and assigning the answer to the $KERNDIR parameter.
The script ends with a routine to make the two parameters
CLASSES and KERNDIR available to the installation environment and the postinstall script.
Create a postinstall script.
The postinstall script actually performs the driver installation. It is executed after the two files buffer and buffer.conf have been installed. The postinstall file shown for this example performs the following actions:
Uses the add_drv command to load the driver into the system
Creates a link for the device using the installf command
Finalizes the installation using the installf -f command
Create a preremove script.
The preremove script uses the rem_drv command to unload the driver from the system, and then removes the link /dev/buffer0.