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two processes can not share function pointers.
if you want to use functions in two processes make library for that functions
and use that library in your processes

we can do it by using RPC ipc mechanisam... we can cal functions in other proceses

Both process has a different virtual address space. If you send address of a function from process A to process B, in process B address from A does not make any sense. The memory mapping in process A will be different from that in process B. If you want to do so u need to know the memory mapping of process A and according to that you need to deference the memory in process B.

There are 4 types of IPC's namely
1. Pipes
2. Shared Memory
3. Message Queues
4. Semaphores
Function pointers are variables defined in a process and can be used by any threads forked by the process hence they use Shared Memory