Why is this code not working? What is missing? Anyone could let me know?

int GetNode(struct Node, int positionFromTail) { static int position = 0; int ret = 0;

    if (head) {
            ret = GetNode(head->next, positionFromTail);    
            if (position++ == positionFromTail)
                    return head->data;
    }    
    return ret;

}