Fix memory leak in MacOS process handling.

runtime/bin/socket.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.
 
 interface ServerSocket factory _ServerSocket {
   /*
    * Constructs a new server socket, binds it to a given address and port,
    * and listens on it.
    */
   ServerSocket(String bindAddress, int port, int backlog);
@@ skipping 44 matching lines @@
    * buffer after buffer offset [offset]. The number of successfully read
    * bytes is returned. This function is non-blocking and will only read data
    * if data is available.
    */
   int readList(List<int> buffer, int offset, int count);
 
   /*
    * Writes up to [count] bytes of the buffer from [offset] buffer offset to
    * the socket. The number of successfully written bytes is returned. This
    * function is non-blocking and will only write data if buffer space is
-   * available in the socket. It will return 0 if an error occurs, e.g., no
-   * buffer space available.
+   * available in the socket.
    */
   int writeList(List<int> buffer, int offset, int count);
 
   /*
    * The connect handler gets called when connection to a given host
    * succeeded.
    */
   void set connectHandler(void callback());
 
   /*
@@ skipping 47 matching lines @@
 
 class SocketIOException implements Exception {
   const SocketIOException([String this.message = ""]);
   String toString() => "SocketIOException: $message";
 
   /*
    * Contains the exception message.
    */
   final String message;
 }