From 72a39226178d49a7574f805190ba2fb190a0ca2e Mon Sep 17 00:00:00 2001
From: Geoff Garside <geoff@geoffgarside.co.uk>
Date: Mon, 19 Sep 2011 23:31:41 +0100
Subject: [PATCH] Add static anetV6Only() function.

This function sets the IPV6_V6ONLY option to 1 to use separate stack
IPv6 sockets.
---
 src/anet.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/anet.c b/src/anet.c
index f86c5249..bbefa2fe 100644
--- a/src/anet.c
+++ b/src/anet.c
@@ -362,6 +362,16 @@ static int anetListen(char *err, int s, struct sockaddr *sa, socklen_t len) {
     return ANET_OK;
 }
 
+static int anetV6Only(char *err, int s) {
+    int yes = 1;
+    if (setsockopt(s,IPPROTO_IPV6,IPV6_V6ONLY,&yes,sizeof(yes)) == -1) {
+        anetSetError(err, "setsockopt: %s", strerror(errno));
+        close(s);
+        return ANET_ERR;
+    }
+    return ANET_OK;
+}
+
 int anetTcpServer(char *err, int port, char *bindaddr)
 {
     int s, rv;