I think you are looking for Upcall Functionality

upcall functionality allows a kernel module to invoke a function in user
space. It is possible to start a program in user space, and give it some
command line arguments, as well as setting environment variables.


**
int call_usermodehelper  (char * *path*, char ** *argv*, char ** *envp*,
int *wait*);

Runs a user-space application. The application is started asynchronously if
wait is not set, and runs as a child of keventd. (ie. it runs with full
root capabilities).

Must be called from process context. Returns a negative error code if
program was not execed successfully, or 0.

**man pages

Regards

Santosh



On Wed, Nov 7, 2012 at 8:30 PM, Bernd Petrovitsch <bernd@petrovitsch.priv.at

wrote:

Hi!

On Sam, 2012-11-03 at 19:14 +0530, Jeshwanth Kumar N K Jeshu wrote:
[...]

quoted

Can I call userspace function from kernel module ? Actually I need to
process some data in user space for every event occured in kernel module.

The usual way to implement this with a character device. The userspace
application opens the character device. It then read()s the events from
it, handles it and write()s results back (if needed).
The kernel part handles to IRQs, puts that into a buffer where it waits
for the read() from user space.

You can use netlink sockets for this which may save some code though or
implement a character device directly.

Kind regards,
        Bernd
--
Bernd Petrovitsch                  Email : bernd at petrovitsch.priv.at
                     LUGA : http://www.luga.at


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-- 
*Regards,
Santosh*
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