cluster: emit 'message' event on cluster master

For consistency with the worker 'exit', 'online', 'disconnect', and
'listening' events which are emitted on worker and cluster, also emit
'message' on cluster.

Reviewed-by: Sam Roberts <vieuxtech@gmail.com>
Reviewed-by: Christian Tellnes <christian@tellnes.no>
Reviewed-by: Stephen Belanger <admin@stephenbelanger.com>
PR-URL: https://github.com/nodejs/io.js/pull/861

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/cluster.js b/lib/cluster.js
index bb4b60a2fc..bcde4ce1fa 100644
--- a/lib/cluster.js
+++ b/lib/cluster.js
@@ -319,6 +319,8 @@ function masterInit() {
       process: workerProcess
     });
 
+    worker.on('message', this.emit.bind(this, 'message'));
+
     function removeWorker(worker) {
       assert(worker);