+/* Flags for select_fd's WAIT_FOR argument. */
+enum {
+ WAIT_FOR_READ = 1,
+ WAIT_FOR_WRITE = 2
+};
+int select_fd PARAMS ((int, double, int));
+int test_socket_open PARAMS ((int));
+int socket_has_inet6 PARAMS ((void));
+
+typedef int (*fd_reader_t) PARAMS ((int, char *, int, void *));
+typedef int (*fd_writer_t) PARAMS ((int, char *, int, void *));
+typedef int (*fd_poller_t) PARAMS ((int, double, int, void *));
+typedef int (*fd_peeker_t) PARAMS ((int, char *, int, void *));
+typedef void (*fd_closer_t) PARAMS ((int, void *));
+void fd_register_transport PARAMS ((int, fd_reader_t, fd_writer_t,
+ fd_poller_t, fd_peeker_t, fd_closer_t,
+ void *));
+
+int fd_read PARAMS ((int, char *, int, double));
+int fd_write PARAMS ((int, char *, int, double));
+int fd_peek PARAMS ((int, char *, int, double));
+void fd_close PARAMS ((int));