X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/97cfe3942f67200f77f6ae9b302409075e4e5792..2130e492c2cda886d74abbb77df4493f151e0a44:/src/src/daemon.c?ds=sidebyside

diff --git a/src/src/daemon.c b/src/src/daemon.c
index 21807f64f..1006961d3 100644
--- a/src/src/daemon.c
+++ b/src/src/daemon.c
@@ -2431,6 +2431,11 @@ for (;;)
 
       if (accept_socket >= 0)
         {
+#ifdef TCP_QUICKACK /* Avoid pure-ACKs while in tls protocol pingpong phase */
+	/* Unfortunately we cannot be certain to do this before a TLS-on-connect
+	Client Hello arrives and is acked. We do it as early as possible. */
+	(void) setsockopt(accept_socket, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
+#endif
         if (inetd_wait_timeout)
           last_connection_time = time(NULL);
         handle_smtp_call(listen_sockets, listen_socket_count, accept_socket,