Fix a number of issues with the process handling

runtime/bin/socket.h

 // 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.
 
 #ifndef BIN_SOCKET_H_
 #define BIN_SOCKET_H_
 
 #include "bin/builtin.h"
 #include "bin/globals.h"
 
 
 class Socket {
  public:
   static bool Initialize();
   static intptr_t Available(intptr_t fd);
-  static intptr_t Read(intptr_t fd, void* buffer, intptr_t num_bytes);
-  static intptr_t Write(intptr_t fd, const void* buffer, intptr_t num_bytes);
+  static int Read(intptr_t fd, void* buffer, intptr_t num_bytes);
+  static int Write(intptr_t fd, const void* buffer, intptr_t num_bytes);
   static intptr_t CreateConnect(const char* host, const intptr_t port);
   static intptr_t GetPort(intptr_t fd);
   static intptr_t GetStdioHandle(int num);
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Socket);
 };
 
 
 class ServerSocket {
  public:
   static intptr_t Accept(intptr_t fd);
   static intptr_t CreateBindListen(const char* bindAddress,
                                    intptr_t port,
                                    intptr_t backlog);
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServerSocket);
 };
 
 #endif  // BIN_SOCKET_H_