hi.
i am developing a small module for the linux 2.6.14 kernel.
so far i have been able to create the character devices that will contain any kind of char data i send them.
for example, if i type
echo HELLO WORLD > /dev/vale0
and then
cat < /dev/vale0
then the output will be
HELLO WORLD
but now i would like to alter the result of the last cat comment.
let's say i want to swap the letter O with the letter X so that the output will be:
cat < /dev/vale0
HELLX WXRLD
i suppose the main task is to modify the copy_to_user buffer, but I have absolutely no idea of doing it.
any suggestion will be gladfully accepted.
thanks guys