+struct IODescriptor *iohandler_listen_flags(const char *hostname, unsigned int port, iohandler_callback *callback, int flags);
+struct IODescriptor *iohandler_listen_ssl(const char *hostname, unsigned int port, const char *certfile, const char *keyfile, iohandler_callback *callback);
+struct IODescriptor *iohandler_listen_ssl_flags(const char *hostname, unsigned int port, const char *certfile, const char *keyfile, iohandler_callback *callback, int flags);