+YAZ_EXPORT
+void yaz_sock_chan_set_mask(yaz_sock_chan_t chan, unsigned mask);
+
+YAZ_EXPORT
+void yaz_sock_chan_set_max_idle(yaz_sock_chan_t chan, int max_idle);
+
+YAZ_EXPORT
+unsigned yaz_sock_get_mask(yaz_sock_chan_t chan);
+
+YAZ_EXPORT
+void *yaz_sock_chan_get_data(yaz_sock_chan_t chan);
+