memory mock test

complie command

g++ -Wl,--wrap=malloc -Wl,--wrap=free test.cpp

test.cpp

#include <stdio.h>
#include <stdlib.h>

#ifdef __cplusplus
extern "C" {
#endif
void *__real_malloc(size_t);
void *__wrap_malloc(size_t c) {
  void *ptr = __real_malloc(c);
  printf("malloc called with %zu %p\n", c, ptr);
  return ptr;
}
void *__real_free(void *ptr);
void *__wrap_free(void *ptr) {
  printf("free called with %p\n", ptr);
  return __real_free(ptr);
}
#ifdef __cplusplus
}
#endif

int main(int argc, char const *argv[]) {
  int *p = (int *)malloc(10000);
  printf("%p\n", p);
  free(p);
  return 0;
}