How to Bypass a Standard C++ Function While Maintaining Its Functionality

Question

I am looking for a way to be able to redefine a set of POSIX functions but then end the redefinition with a call to the original function. The idea is that I am trying to create

Answer 1

Here is how you would you change MY_string.h

#include 

namespace my_functions{
    char *strcpy(char *s1, const char *s2)
    {
#if defined(PROFILE_PASS_THROUGH)
        printf("strcpy is not allowed in this profile\n");
        return std::strcpy(s1, s2);
#elif defined(PROFILE_ERROR)
        static_assert(0, "strcpy is not allowed in this profile\n");
        return 0;
#else
        return std::strcpy(s1, s2);
#endif
     }

}
using namespace my_functions;

For this to work you cannot include or have using namespace std;