+/* Returned by connect_to_host when host name cannot be resolved. */
+enum {
+ E_HOST = -100
+};
+int connect_to_host PARAMS ((const char *, int));
+int connect_to_ip PARAMS ((const ip_address *, int, const char *));
+
+int bind_local PARAMS ((const ip_address *, int *));
+int accept_connection PARAMS ((int));
+
+enum {
+ ENDPOINT_LOCAL,
+ ENDPOINT_PEER
+};
+int socket_ip_address PARAMS ((int, ip_address *, int));
+
+int retryable_socket_connect_error PARAMS ((int));
+
+/* 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 *));