+/*************************************************
+TCP Fast Open: check that the ioctl is accepted
+*************************************************/
+
+#ifndef COMPILE_UTILITY
+void
+tfo_probe(void)
+{
+# ifdef TCP_FASTOPEN
+int sock;
+
+if ( (sock = socket(AF_INET, SOCK_STREAM, 0)) >= 0
+ && setsockopt(sock, IPPROTO_TCP, TCP_FASTOPEN, &on, sizeof(on) >= 0)
+ )
+ f.tcp_fastopen_ok = TRUE;
+close(sock);
+# endif
+}
+#endif
+
+