doq_conn_cmp
table->conn_tree = rbtree_create(doq_conn_cmp);
int doq_conn_cmp(const void* key1, const void* key2);
else if(fptr == &doq_conn_cmp) return 1;
table->conn_tree = rbtree_create(doq_conn_cmp);
int doq_conn_cmp(const void* key1, const void* key2);
else if(fptr == &doq_conn_cmp) return 1;