Fix issues with Socket shutdown.

tests/standalone/io/issue_22637_test.dart

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file

[Bill Hesse, 2015/03/03 16:17:45]

2015

+// 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.
+//
+// This test checks that a shutdown(SocketDirection.SEND) of a socket,
+// when the other end is already closed, does not discard unread data
+// that remains in the connection.
+
+import "dart:io";
+import "dart:async";
+import "package:expect/expect.dart";
+
+RawServerSocket server;
+RawSocket client;
+Duration delay = new Duration(seconds: 1);
+
+void serverListen(RawSocket serverSide) {
+  var data = new List.generate(200, (i) => i % 20 + 65);
+  var offset = 0;
+  void serveData(RawSocketEvent event) {
+    if (event == RawSocketEvent.WRITE) {
+      while (offset < data.length) {
+        var written = serverSide.write(data, offset);
+        offset += written;
+        if (written == 0) {
+          serverSide.writeEventsEnabled = true;
+          return;
+        }
+      }
+      serverSide.close();
+      server.close();
+    }
+  }
+  serverSide.listen(serveData);
+}
+
+
+void clientListen(RawSocketEvent event) {
+  if (event == RawSocketEvent.READ) {
+    client.readEventsEnabled = false;
+    new Future.delayed(delay, () {
+      var data = client.read(100);
+      Expect.isNotNull(data);
+      client.shutdown(SocketDirection.SEND);
+      data = client.read(100);
+      Expect.isNotNull(data);
+      client.close();
+    });      
+  }
+}
+
+
+test() async {
+  server = await RawServerSocket.bind("localhost", 1968);
+  server.listen(serverListen);
+  client = await RawSocket.connect("localhost", 1968);
+  client.listen(clientListen);
+}
+
+
+void main() {
+  test();
+}