cluster: include settings object in 'setup' event

Emits on every call to cluster.setupMaster(), even if no new settings
are given. This is because calling cluster.setupMaster() without
arguments (or with an empty options object) results in the settings
being restored to their defaults.

Signed-off-by: Fedor Indutny <fedor@indutny.com>

doc/api/cluster.markdown

@@ -250,7 +250,15 @@ See [child_process event: 'exit'](child_process.html#child_process_event_exit).
 
 ## Event: 'setup'
 
-Emitted every time `.setupMaster()` is called with a `settings` argument.
+* `settings` {Object}
+
+Emitted every time `.setupMaster()` is called.
+
+The `settings` object is the `cluster.settings` object at the time
+`.setupMaster()` was called and is advisory only, since multiple calls to
+`.setupMaster()` can be made in a single tick.
+
+If accuracy is important, use `cluster.settings`.
 
 ## cluster.setupMaster([settings])
 

lib/cluster.js

@@ -258,8 +258,8 @@ function masterInit() {
     }
     cluster.settings = settings;
     if (initialized === true)
-      return options && process.nextTick(function() {
+      return process.nextTick(function() {
-        cluster.emit('setup');
+        cluster.emit('setup', settings);
       });
     initialized = true;
     schedulingPolicy = cluster.schedulingPolicy;  // Freeze policy.
@@ -274,7 +274,7 @@ function masterInit() {
     });
 
     process.nextTick(function() {
-      cluster.emit('setup');
+      cluster.emit('setup', settings);
     });
   };
 

test/simple/test-cluster-setup-master-emit.js

@@ -0,0 +1,60 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+var common = require('../common');
+var assert = require('assert');
+var cluster = require('cluster');
+
+assert(cluster.isMaster);
+
+var assertsRun = 0;
+
+function emitAndCatch(next) {
+  cluster.once('setup', function(settings) {
+    assert.strictEqual(settings.exec, 'new-exec');
+    console.log('ok "setup" emitted with options set');
+    assertsRun += 1;
+    setImmediate(next);
+  });
+  cluster.setupMaster({ exec: 'new-exec' });
+}
+
+function emitAndCatch2(next) {
+  cluster.once('setup', function(settings) {
+    assert('exec' in settings);
+    console.log('ok "setup" emitted without options set');
+    assertsRun += 1;
+    setImmediate(next);
+  });
+  cluster.setupMaster();
+}
+
+process.on('exit', function() {
+  assert.strictEqual(assertsRun, 2);
+  console.log('ok correct number of assertions');
+});
+
+emitAndCatch(function() {
+  emitAndCatch2(function() {
+    console.log('ok emitted and caught');
+  });
+});