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Suggestion for modification of a system call?

Posted by HissPirat 

I am taking an operating systems course where we have a bonus assignment of modifying a linux kernel system call. The suggested modification was to "Make use of the Linux Netpoll API in the write syscall." but I can't find the documentation for how to send data using a file descriptor and the netpoll api. So I want to modify some other system call but have a hard time finding a suitable modification to do.

Any suggestions for an intersting modification to a system call that I could do?
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