Extend dart:io error handling to all socket functions

runtime/bin/eventhandler_win.h

 // 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.
 
 #ifndef BIN_EVENTHANDLER_WIN_H_
 #define BIN_EVENTHANDLER_WIN_H_
 
 #if !defined(BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_win.h directly; use eventhandler.h instead.
 #endif
@@ skipping 180 matching lines @@
 
   void MarkDoesNotSupportOverlappedIO() {
     flags_ |= (1 << kDoesNotSupportOverlappedIO);
   }
   bool SupportsOverlappedIO() {
     return (flags_ & (1 << kDoesNotSupportOverlappedIO)) == 0;
   }
 
   void ReadSyncCompleteAsync();
 
+  DWORD last_error() { return last_error_; }
+  void set_last_error(DWORD last_error) { last_error_ = last_error; }
+
  protected:
   enum Flags {
     kClosing = 0,
     kCloseRead = 1,
     kCloseWrite = 2,
     kDoesNotSupportOverlappedIO = 3
   };
 
   explicit Handle(HANDLE handle);
   Handle(HANDLE handle, Dart_Port port);
 
   virtual void AfterClose() = 0;
 
   Type type_;
   HANDLE handle_;
   Dart_Port port_;  // Dart port to communicate events for this socket.
   intptr_t mask_;  // Mask of events to report through the port.
   HANDLE completion_port_;
   EventHandlerImplementation* event_handler_;
 
   IOBuffer* data_ready_;  // IO buffer for data ready to be read.
   IOBuffer* pending_read_;  // IO buffer for pending read.
   IOBuffer* pending_write_;  // IO buffer for pending write
 
+  DWORD last_error_;
+
  private:
   int flags_;
   CRITICAL_SECTION cs_;  // Critical section protecting this object.
 };
 
 
 class FileHandle : public Handle {
  public:
   explicit FileHandle(HANDLE handle)
       : Handle(reinterpret_cast<HANDLE>(handle)) { type_ = kFile; }
@@ skipping 107 matching lines @@
   virtual ~EventHandlerImplementation() {}
 
   void SendData(intptr_t id, Dart_Port dart_port, intptr_t data);
   void StartEventHandler();
 
   DWORD GetTimeout();
   void HandleInterrupt(InterruptMessage* msg);
   void HandleTimeout();
   void HandleAccept(ListenSocket* listen_socket, IOBuffer* buffer);
   void HandleClosed(Handle* handle);
+  void HandleError(Handle* handle);
   void HandleRead(Handle* handle, int bytes, IOBuffer* buffer);
   void HandleWrite(Handle* handle, int bytes, IOBuffer* buffer);
   void HandleClose(ClientSocket* client_socket);
   void HandleIOCompletion(DWORD bytes, ULONG_PTR key, OVERLAPPED* overlapped);
 
   HANDLE completion_port() { return completion_port_; }
 
  private:
   ClientSocket* client_sockets_head_;
 
   int64_t timeout_;  // Time for next timeout.
   Dart_Port timeout_port_;
   HANDLE completion_port_;
 };
 
 
 #endif  // BIN_EVENTHANDLER_WIN_H_