asked on

looping

Hi I am writing a kernel module.

I need a continuous loop that will look for tcp traffic and read from skb to store each source ip address from ip_hdr->saddr into an array

I can get it to read packets one at a time but I need it to loop, but when I try to implement a continuous loop the system crashes/hangs.

Can anyone offer any advice/possible fixes?

Cheers

Anthony2000

Here is an example of using a thread in the kernel module.

http://www.scs.ch/~frey/linux/kernelthreads.html

I think your problem might be that your loop is running and using all available kernel/process time. Thus, giving the result of maybe locking up your machine. Is that what is happening?

codey-06

ASKER

Hi yes you are correct, the loop is using up all the kernel resources. Is there a quick fix?

Anthony2000

Have you tried some kind of sleep (I cannot remember the API call). This may give the OS and other processes time to run.

codey-06

ASKER

Thank you. If anyone could offer a bit more help it would be very much appreciated?

SOLUTION

sarabande

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Anthony2000

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Anthony2000

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Anthony2000

Also, take a look at the functions:
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout (signed long timeout);

See chapter 7 of the book link I provided.

codey-06

ASKER

Brilliant thank you