LKM

gr33ndata · 02-09-2005, 08:54 AM

Hey, I want a Loadable Kernel Module to be able to get some configuration from a text file. The problem is that LKMs cannot use fopen, fprintf, fscanf etc. So is there alternatives that I can use. Also can an LKM get data from a Shared Memory, so that I can make a program to parse the config file and adds this data in a structure in some Shmem for the LKM to read.
Thanks a lot

gr33ndata · 02-10-2005, 06:12 PM

Any replies !?

shishir · 02-11-2005, 12:21 AM

you could use a proc entry to have this functionality ...this way you'll be able to share data...and do whatever you want to..
also there is a concept of intermodule communication...if you want you can use that too...

gr33ndata · 02-11-2005, 07:33 AM

Hi Shishir
Thank you, so what do people in real life actually do? Do you know any examples?

shishir · 02-11-2005, 07:51 AM

most of the time...at least that is what i used..proc entry is easy to implement and to use to...that is not to say that intermodule communication is rocket science...but cos i have never used it..cant really vouch for it...sorry if this answer is too skewed towards proc..

gr33ndata · 02-11-2005, 09:09 AM

Hey,
I also heard about using NetLink or even Simple Sockets to communicate between user and kernel spaces. Hoever I have no clue of the implementation.
Any ways, thank you for your advice, and I'll try to inform you of what I'll do whenever it is done.
Also if any one have more advices or more ideas and real world implementations. please tell me.

shishir · 02-11-2005, 09:35 AM

netlink spcklets are used to exchange routing information between the user space and the kernel space..
you can use it to exchange the routing information between the user space and kernel space...but i thot you wanted two kernel modules ..in that case you can use ioctl also .if it a user space kernel space communication...
yopu can create a character device and pass the info you want from the kernel using copy to user and copyfromuser...
-shishir

blackzone · 02-22-2005, 04:27 AM

hi can give a very simple LKM example to read/write proc fs?

have a hard time getting the example on other tutorial to work.

gr33ndata · 02-22-2005, 04:54 AM

See this link, and looking for your feedback
http://www.geocities.com/gr33ndata/articles/proc.txt