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Actually we are trying to port 'Udhcpc' to our embedded linux application. But in source code of Udhcp, we've found that it has registered some interrupts with its handlers, which was already been registered by our application. Thus i had doubt about such scenerios.
The first-level interrupt handler can launch more than one second-level response to it, depending on the situation and architecture. Most commonly the second level response is a chain of subroutine-calls.