From 256df78fc6659a4799d25bf78da9bb16f881d31a Mon Sep 17 00:00:00 2001
From: Eric Frias <efrias@syncad.com>
Date: Thu, 2 Oct 2014 14:49:38 -0400
Subject: [PATCH] Allow binaries compiled on a system that doesn't support
 SO_REUSEPORT to use the option on systems that do support it

---
 src/network/tcp_socket.cpp | 42 ++++++++++++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 9 deletions(-)

diff --git a/src/network/tcp_socket.cpp b/src/network/tcp_socket.cpp
index f5a3617..70bb28a 100644
--- a/src/network/tcp_socket.cpp
+++ b/src/network/tcp_socket.cpp
@@ -13,6 +13,11 @@
 
 namespace fc {
 
+  namespace detail
+  {
+    bool have_so_reuseport = true;
+  }
+
   class tcp_socket::impl : public tcp_socket_io_hooks {
     public:
       impl() :
@@ -205,13 +210,24 @@ namespace fc {
     FC_ASSERT(my->_sock.is_open());
     boost::asio::socket_base::reuse_address option(enable);
     my->_sock.set_option(option);
-#if defined(__APPLE__) || (defined(__linux__) && defined(SO_REUSEPORT))
+#if defined(__APPLE__) || defined(__linux__)
+# ifndef SO_REUSEPORT
+#  define SO_REUSEPORT 15
+# endif
     // OSX needs SO_REUSEPORT in addition to SO_REUSEADDR.
     // This probably needs to be set for any BSD
-    int reuseport_value = 1;
-    if (setsockopt(my->_sock.native(), SOL_SOCKET, SO_REUSEPORT, 
-                   (char*)&reuseport_value, sizeof(reuseport_value)) < 0)
-        wlog("Error setting SO_REUSEPORT");
+    if (detail::have_so_reuseport)
+    {
+      int reuseport_value = 1;
+      if (setsockopt(my->_sock.native(), SOL_SOCKET, SO_REUSEPORT, 
+                     (char*)&reuseport_value, sizeof(reuseport_value)) < 0)
+      {
+        if (errno == ENOPROTOOPT)
+          detail::have_so_reuseport = false;
+        else
+          wlog("Error setting SO_REUSEPORT");
+      }
+    }
 #endif // __APPLE__
   }
 
@@ -267,10 +283,18 @@ namespace fc {
 #if defined(__APPLE__) || (defined(__linux__) && defined(SO_REUSEPORT))
     // OSX needs SO_REUSEPORT in addition to SO_REUSEADDR.
     // This probably needs to be set for any BSD
-    int reuseport_value = 1;
-    if (setsockopt(my->_accept.native(), SOL_SOCKET, SO_REUSEPORT, 
-                   (char*)&reuseport_value, sizeof(reuseport_value)) < 0)
-        wlog("Error setting SO_REUSEPORT");
+    if (detail::have_so_reuseport)
+    {
+      int reuseport_value = 1;
+      if (setsockopt(my->_accept.native(), SOL_SOCKET, SO_REUSEPORT, 
+                     (char*)&reuseport_value, sizeof(reuseport_value)) < 0)
+      {
+        if (errno == ENOPROTOOPT)
+          detail::have_so_reuseport = false;
+        else
+          wlog("Error setting SO_REUSEPORT");
+      }
+    }
 #endif // __APPLE__
   }
   void tcp_server::listen( uint16_t port )