struct btr_pool *btr_pool_new(const char *name, size_t area_size);
void btr_pool_free(struct btr_pool *btrp);
size_t btr_pool_get_buffer(struct btr_pool *btrp, char **result);
+int btr_pool_get_buffers(struct btr_pool *btrp, struct iovec iov[2]);
void btr_add_output_pool(struct btr_pool *btrp, size_t size,
struct btr_node *btrn);
size_t btr_pool_unused(struct btr_pool *btrp);