-typedef int (*fd_reader_t) (int, char *, int, void *);
-typedef int (*fd_writer_t) (int, char *, int, void *);
-typedef int (*fd_poller_t) (int, double, int, void *);
-typedef int (*fd_peeker_t) (int, char *, int, void *);
-typedef void (*fd_closer_t) (int, void *);
-void fd_register_transport (int, fd_reader_t, fd_writer_t,
- fd_poller_t, fd_peeker_t, fd_closer_t, void *);
-void *fd_transport_context (int);
+struct transport_implementation {
+ int (*reader) (int, char *, int, void *);
+ int (*writer) (int, char *, int, void *);
+ int (*poller) (int, double, int, void *);
+ int (*peeker) (int, char *, int, void *);
+ const char *(*errstr) (int, void *);
+ void (*closer) (int, void *);
+};