Hi

I have created a List data structure implementation for generic data type with each node declared as following.

struct Node
{
  void *data;
  ....
  ....
}

So each node in my list will have pointer to the actual data(generic could be anything) item that should be stored in the list. I have following signature for adding a node to the list

AddNode(struct List *list, void* eledata);

the problem is when i want to remove a node i want to free even the data block pointed by *data pointer inside the node structure that is going to be freed. at first freeing of datablock seems to be straight forward

free(data) // forget about the syntax.....

But if data is pointing to a block created by malloc then the above call is fine....and we can free that block using free function

 int *x = (int*) malloc(sizeof(int));
 *x = 10;
  AddNode(list,(void*)x); // x can be freed as it was created using malloc

what if a node is created as following

  int x = 10;
  AddNode(list,(void*)&x); // x cannot be freed as it was not created using malloc

Here we cannot call free on variable x!!!!

How do i know or implement the functionality for both dynamically allocated variables and static ones....that are passed to my list....

Thanks in advance...