extern void init_submeshes(struct meshlink_handle *mesh);
extern void exit_submeshes(struct meshlink_handle *mesh);
-extern submesh_t *create_submesh(struct meshlink_handle *mesh, const char *);
-extern submesh_t *lookup_submesh(struct meshlink_handle *mesh, const char *);
-extern submesh_t *lookup_or_create_submesh(struct meshlink_handle *mesh, const char *);
-extern bool submesh_allows_node(const submesh_t *submesh, const struct node_t *node);
+extern submesh_t *create_submesh(struct meshlink_handle *mesh, const char *) __attribute__((__warn_unused_result__));
+extern submesh_t *lookup_submesh(struct meshlink_handle *mesh, const char *) __attribute__((__warn_unused_result__));
+extern submesh_t *lookup_or_create_submesh(struct meshlink_handle *mesh, const char *) __attribute__((__warn_unused_result__));
+extern bool submesh_allows_node(const submesh_t *submesh, const struct node_t *node) __attribute__((__warn_unused_result__));
#endif