Communicating between user space and kernel space

[urs_balan]

Hi all
i want to write a module which tests a device driver. I want my testing program to sit in the kernel space. For example i am writing test code for testing a flash which has read and write operations. I want my code to be such that,when i insert my module the testing should start automatically and i have to store the log in a file. Please provide some good ideas to do this.

Thanks

Regards
Bala

[sybvn]

I am not sure my idea is a good idea or not, I just think that it can work.

You may want to implement file operation read on your test driver in kernel space, then use copy_to_user() in that read function to make your data available to user space program, then in your user space program you can store that data to log file as need.

[urs_balan]

Hi
Thanks for your reply.

I have found out another solution.
There is a daemon process running which captures the log messages from the kernel. It is /sbin/klogd. This daemon takes the messages from the /proc/kmsg and sends to syslog. For saving this daemon to the log file i have edited the file /etc/sysconfig/syslog. KLOGD_OPTIONS=" -c 1 -x -f /home/bala/log.txt". That -f option is used for storing the log to the specified path. This is how i arrived to the solution. I dont know whether there is any more easy ways are there to do this. If you come to know please intimate me.

Thanks

regards
Bala