-struct upoll;
-
-extern int upoll_is_valid(struct upoll *upoll);
-
-extern struct upoll *upoll_open(int fd, void *closure);
-
-extern int upoll_on_readable(struct upoll *upoll, void (*process)(void *closure));
-extern int upoll_on_writable(struct upoll *upoll, void (*process)(void *closure));
-
-extern void upoll_on_hangup(struct upoll *upoll, void (*process)(void *closure));
-
-extern void upoll_close(struct upoll *upoll);
-
-extern int upoll_wait(int timeout);
-