struct handle;
typedef int (*handle_inputfn_t)(struct handle *h, void *data, int len);
typedef void (*handle_outputfn_t)(struct handle *h, int new_backlog);
struct handle;
typedef int (*handle_inputfn_t)(struct handle *h, void *data, int len);
typedef void (*handle_outputfn_t)(struct handle *h, int new_backlog);