+#if defined(TCP_FASTOPEN) && !defined(__APPLE__)
+ if (tfo)
+ {
+ int backlog = 5;
+ if (setsockopt(listen_socket[v6n], IPPROTO_TCP, TCP_FASTOPEN,
+ &backlog, sizeof(backlog)))
+ if (debug) printf("setsockopt TCP_FASTOPEN: %s\n", strerror(errno));
+ }
+#endif