Hi kristof, when i executed the below line. i din't get what i suppose to get...the message "hello, world".. did i miss any steps sunil@ubuntu:~/test/drive$ sudo insmod helloworld.ko On Mon, Feb 11, 2013 at 4:34 PM, Kristof Provost <kristof@sigsegv.be> wrote:

On 2013-02-11 16:24:17 (+0530), sunil <sunil.slvphsn@gmail.com> wrote:

...

Have a look at this:

donno wats happening:

sunil@ubuntu:~/test/drive$ sudo rmmod helloworld sunil@ubuntu:~/test/drive$ lsmod|grep hellow* Binary file helloworld.ko matches Binary file helloworld.o matches

This doesn't actually do what you seem to think it does. You're not passing the 'hellow*' argument to grep. The 'hellow*' is first expaned by your shell, so it probably turns that command line into 'lsmod | grep helloworld.c helloworld.o helloworld.ko'. Try using 'lsmod | grep hellow' instead (i.e. without the *).

...

sunil@ubuntu:~/test/drive$ modprobe -r helloworld FATAL: Module helloworld not found.

Obviously, because your previous command succeeded. The module is no longer loaded.

Regards, Kristof

PS: Please don't top-post. PS 2: Please keep the mailing list in cc.

-- Regards, Sunil A S