Fix a number of issues with the process handling

tests/standalone/src/ProcessBrokenPipe.dart

+// Copyright (c) 2011, 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.
+//
+// Process test program to test closed stdin from child process.
+
+#source("ProcessTestUtil.dart");
+
+main() {
+  // Running dart without arguments makes it close right away.
+  Process process = new Process(getDartBinFileName(), []);
+
+  // Write to the stdin after the process is terminated to test
+  // writing to a broken pipe.
+  OutputStream output = process.stdin;
+  process.exitHandler = (code) {
+    Expect.isFalse(output.write([0]));
+    process.close();
+  };
+
+  process.start();
+}