检查变量是静态分配还是动态分配？

Question

I'm implementing my own malloc and free functions. How can I have an error check that passes in a static variable over a dynamically allocated variable? Let's say I have:

char foo[10];
void *bar = malloc(5); 

void free(void *p)

Is there a way to tell the user that this is an error?

free(foo)

Answer 1

Your best bet is to maintain a table of allocated pointers within your memory management functions.

Don't forget to remove entries when releasing memory.

Answer 2

This might sounds crazy ,

You need to maintain your allocated pointers from your custom malloc() function in a list/structure. Then when using your custom free() function check whether variable exists inside your maintained list/structure.