From 056c153209fea793ce00986cf102a5b587e28369 Mon Sep 17 00:00:00 2001
From: Pierre Ossman <ossman@cendio.se>
Date: Thu, 23 Apr 2015 11:30:59 +0200
Subject: [PATCH] Clarify Windows SO_REUSEADDR exception

---
 common/network/TcpSocket.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/common/network/TcpSocket.cxx b/common/network/TcpSocket.cxx
index 99895ad8..1ebaeecb 100644
--- a/common/network/TcpSocket.cxx
+++ b/common/network/TcpSocket.cxx
@@ -440,10 +440,15 @@ TcpListener::TcpListener(const struct sockaddr *listenaddr,
   }
 #endif /* defined(IPV6_V6ONLY) */
 
-#ifndef WIN32
+#ifdef FD_CLOEXEC
   // - By default, close the socket on exec()
   fcntl(sock, F_SETFD, FD_CLOEXEC);
+#endif
 
+  // SO_REUSEADDR is broken on Windows. It allows binding to a port
+  // that already has a listening socket on it. SO_EXCLUSIVEADDRUSE
+  // might do what we want, but requires investigation.
+#ifndef WIN32
   if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
                  (char *)&one, sizeof(one)) < 0) {
     int e = errorNumber;
-- 
2.39.5