WeeChat Relay TCP keepalive interval

relay-server.c.diff

diff --git a/src/plugins/relay/relay-server.c b/src/plugins/relay/relay-server.c
index 900ecf9..c64bcaa 100644
--- a/src/plugins/relay/relay-server.c
+++ b/src/plugins/relay/relay-server.c
@@ -29,6 +29,7 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#include <netinet/tcp.h>
 #include <arpa/inet.h>
 
 #include "../weechat-plugin.h"
@@ -455,6 +456,21 @@ relay_server_create_socket (struct t_relay_server *server)
         return 0;
     }
 
+    /* set option TCP_KEEPINTVL to 120 seconds */
+    set = 120;
+    if (setsockopt (server->sock, SOL_TCP, TCP_KEEPINTVL,
+                    (void *) &set, sizeof (set)) < 0)
+    {
+        weechat_printf (NULL,
+                        _("%s%s: cannot set socket option \"%s\" to %d: "
+                          "error %d %s"),
+                        weechat_prefix ("error"), RELAY_PLUGIN_NAME,
+                        "TCP_KEEPINTVL", set, errno, strerror (errno));
+        close (server->sock);
+        server->sock = -1;
+        return 0;
+    }
+
     /* bind */
     if (bind (server->sock, (struct sockaddr *)ptr_addr, addr_size) < 0)
     {