From 944382a62e47176e44ef35c18440ace180b6d2e1 Mon Sep 17 00:00:00 2001
From: neheb <rosenp@gmail.com>
Date: Fri, 17 Feb 2017 16:47:11 -0800
Subject: [PATCH] Add TCP_FASTOPEN support

Should make transmission slightly faster.
---
 libtransmission/net.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/libtransmission/net.c b/libtransmission/net.c
index b1fbb45cc..ae1faf80f 100644
--- a/libtransmission/net.c
+++ b/libtransmission/net.c
@@ -384,6 +384,17 @@ tr_netBindTCPImpl (const tr_address * addr,
     if (!suppressMsgs)
         tr_logAddDebug ("Bound socket %" PRIdMAX " to port %d on %s", (intmax_t) fd, port, tr_address_to_string (addr));
 
+#ifdef TCP_FASTOPEN
+
+#ifndef SOL_TCP
+#define SOL_TCP IPPROTO_TCP
+#endif
+
+    optval = 5;
+    setsockopt (fd, SOL_TCP, TCP_FASTOPEN, (const void *) &optval, sizeof (optval));
+
+#endif
+
     if (listen (fd, 128) == -1) {
         *errOut = sockerrno;
         tr_netCloseSocket (fd);