GotchaTool.cpp

struct gotcha_binding_t mpi_wrappers[] = {
  { "MPI_Init", mpi_init_wrapper, &orig_mpi_init_handle },
  // other wrappers as desired
};

static int mpi_init_wrapper(int* argc, char*** argv )
{
   typeof(&puts) orig_init = gotcha_get_wrappee(orig_mpi_init_handle);
   /** do tool_things */
   return orig_init(str);
}

void init_tool()
{
   if(you_want_to){
     result = gotcha_wrap(mpi_wrappers, 
                          number_of_wrappers, 
                          "myToolName");
   }
}