this is untested and might not even compile. if that's the case tell me whats wrong with it and i'll fix

gistfile1.m

// declaring the function pointer
    int *(*cool_function_pointer)(int, char, float);
//   ^                             ^    ^      ^
// function's retval            function parameters


// getting a pointer to the function
    *(void **)(&cool_function_pointer) = dlsym(RTLD_DEFAULT, "cool_function_name");
//     ^                                        ^                            ^
//  always void                means "get func from hooked process"       name of function in the binary (should appear as string in dasm)


// call the function
(*cool_function_pointer)(1234, 'a', 56.78f);