Fix error reporting in child_process callbacks

Issue 120, test case by Nathan Ostgard

lib/child_process.js

@@ -86,7 +86,7 @@ exports.execFile = function (file, args /*, options, callback */) {
 
 
 function ChildProcess () {
-  process.EventEmitter.call(this);
+  EventEmitter.call(this);
 
   var self = this;
 
@@ -99,11 +99,14 @@ function ChildProcess () {
   var stdout = this.stdout = new Stream();
   var stderr = this.stderr = new Stream();
 
-  stderr.onend = stdout.onend = function () {
+  function onClose () {
     if (gotCHLD && !stdout.readable && !stderr.readable) {
       self.emit('exit', exitCode, termSignal);
     }
-  };
+  }
+
+  stderr.addListener('close', onClose);
+  stdout.addListener('close', onClose);
 
   internal.onexit = function (code, signal) {
     gotCHLD = true;

test/simple/test-child-process-exit-code.js

@@ -1,11 +1,30 @@
 require("../common");
-var spawn = require('child_process').spawn
+spawn = require('child_process').spawn,
-  , path = require('path')
+path = require('path');
-  , sub = path.join(fixturesDir, 'exit.js')
-  , child = spawn(process.argv[0], [sub, 23])
-  ; 
 
-child.addListener('exit', function(code, signal) {
+exits = 0;
+
+exitScript = path.join(fixturesDir, 'exit.js')
+exitChild = spawn(process.argv[0], [exitScript, 23]);
+exitChild.addListener('exit', function(code, signal) {
   assert.strictEqual(code, 23);
   assert.strictEqual(signal, null);
-});
+
+  exits++;
+});
+
+
+
+errorScript = path.join(fixturesDir, 'child_process_should_emit_error.js')
+errorChild = spawn(process.argv[0], [errorScript]);
+errorChild.addListener('exit', function(code, signal) {
+  assert.ok(code !== 0);
+  assert.strictEqual(signal, null);
+
+  exits++;
+});
+
+
+process.addListener('exit', function () {
+  assert.equal(2, exits);
+});