digraph_path
struct digraph_path *pathnode = NULL;
pathnode = topo_hdl_zalloc(thp, sizeof (struct digraph_path));
topo_hdl_free(thp, pathnode, sizeof (struct digraph_path));
struct digraph_path *path;
struct digraph_path *tmp = path;
topo_hdl_free(thp, tmp, sizeof (struct digraph_path));
struct digraph_path *tmp = path;
topo_hdl_free(thp, tmp, sizeof (struct digraph_path));