---------------------here is the program --------------------------

struct list * reverse_ll( struct list * head, struct list * prev)
{
       struct list * temp = NULL; 
       if ( head == NULL ) 
          return prev;

       temp = reverse_ll ( head -> next , head );
       head -> next = prev;
       return temp;
}

-------------- use this function like followwing -----------------

int main()
{
...
    head = reverse_ll(head , NULL);
...
}