Nios II interrupt design example required

I want to understand how to write code for a timer interrupt for the NIOS II in Eclipse. I understand that this will require me to use a timer block in Qsys and than use it to generate the interrupt signal. I am blank on how the C code is to be written and need clarification on this issue.

Is it possible to get a reference design that demonstrates how one may be able to implement interrupts in the NIOS II, with the Qsys side as well as the Eclipse side made manifest? A most humble design shall be well recieved if it can demonstrate the concept.