net: register net.Server callback only once

Only register once for listening when passing a callback to Server.listen(),
this prevents servers recycled using close() from invoking the callback when
Server.listen() is called later.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/net.js b/lib/net.js
index 561ebaec1f..8404d6f44c 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -698,7 +698,7 @@ Server.prototype.listen = function() {
 
   var lastArg = arguments[arguments.length - 1];
   if (typeof lastArg == 'function') {
-    self.addListener('listening', lastArg);
+    self.once('listening', lastArg);
   }
 
   var port = toPort(arguments[0]);