struct edge_t *reverse; /* edge in the opposite direction, if available */
int weight; /* weight of this edge */
+ uint32_t session_id; /* the session_id of the from node */
} edge_t;
extern void init_edges(struct meshlink_handle *mesh);
extern void free_edge_tree(struct splay_tree_t *);
extern void edge_add(struct meshlink_handle *mesh, edge_t *);
extern void edge_del(struct meshlink_handle *mesh, edge_t *);
-extern edge_t *lookup_edge(struct node_t *, struct node_t *);
+extern edge_t *lookup_edge(struct node_t *, struct node_t *) __attribute__((__warn_unused_result__));
#endif