Merge pull request #71 from clowwindy/master

use runtime checking instead of compile-time checking for TCP_FASTOPEN

src/local.c

@@ -211,6 +211,12 @@ static void server_recv_cb (EV_P_ ev_io *w, int revents)
                 else
                 {
                     ERROR("sendto");
+                    if (errno == ENOTCONN)
+                    {
+                        LOGE("fast open is not supported on this platform");
+                        // just turn it off
+                        fast_open = 0;
+                    }
                     close_and_free_remote(EV_A_ remote);
                     close_and_free_server(EV_A_ server);
                     return;

src/server.c

@@ -100,7 +100,18 @@ int create_and_bind(const char *host, const char *port)
         if (fast_open)
         {
             opt = 5;
-            setsockopt(listen_sock, SOL_TCP, TCP_FASTOPEN, &opt, sizeof(opt));
+            int r = setsockopt(listen_sock, IPPROTO_TCP, TCP_FASTOPEN, &opt, sizeof(opt));
+            if (r == -1)
+            {
+                if (errno == EPROTONOSUPPORT || errno == ENOPROTOOPT)
+                {
+                    LOGE("fast open is not supported on this platform");
+                }
+                else
+                {
+                    ERROR("setsockopt");
+                }
+            }
         }
 #endif