From fa643bd7bbc7654ef81146a7f2333c74a8a0fda7 Mon Sep 17 00:00:00 2001
From: Huan Vu <huan.t.vu@gmail.com>
Date: Mon, 6 Mar 2017 23:17:10 -0800
Subject: [PATCH] Catch and emit error on socket.addMembership (throws error on
 no network connection) so that library doesn't crash (#34)

---
 index.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 8d9a448..7980249 100644
--- a/index.js
+++ b/index.js
@@ -49,7 +49,11 @@ module.exports = function (opts) {
   socket.on('listening', function () {
     if (!port) port = me.port = socket.address().port
     if (opts.multicast !== false) {
-      socket.addMembership(ip, opts.interface)
+      try {
+        socket.addMembership(ip, opts.interface)
+      } catch (err) {
+        that.emit('error', err)
+      }
       socket.setMulticastTTL(opts.ttl || 255)
       socket.setMulticastLoopback(opts.loopback !== false)
     }