Start better error reporting for sockets

runtime/bin/dartutils.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/dartutils.h"
 
 #include "bin/file.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/globals.h"
@@ skipping 402 matching lines @@
 
 CObject* CObject::IllegalArgumentError() {
   CObjectArray* result = new CObjectArray(CObject::NewArray(1));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kIllegalArgumentError)));
   return result;
 }
 
 
 CObject* CObject::NewOSError() {
   OSError os_error;
+  return NewOSError(&os_error);
+}
+
+CObject* CObject::NewOSError(OSError* os_error) {
   CObject* error_message =
-      new CObjectString(CObject::NewString(os_error.message()));
+      new CObjectString(CObject::NewString(os_error->message()));
   CObjectArray* result = new CObjectArray(CObject::NewArray(3));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kOSError)));
-  result->SetAt(1, new CObjectInt32(CObject::NewInt32(os_error.code())));
+  result->SetAt(1, new CObjectInt32(CObject::NewInt32(os_error->code())));
   result->SetAt(2, error_message);
   return result;
 }