Modify next Instruction in memory with gcc

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C

Linux

GCC

I want to modify next instruction before it fetches, in best answer of this question in foo function, *p points to the next instruction in main function. I want to modify content of where *p points at. For example I want to change the next instruction to a jump instruction. How to I can do this?

void foo()
{
    void** p = search((void**)&p, __builtin_return_address(0));
    // modify content of where *p points at.
}

int main()
{

    foo();
    //next instruction. *p points here
    return 0;
}

I want to do this with gcc compiler, on intel Core-i7 3632QM processor.