mcs/class/System/System.Net.Sockets/Socket_2_1.cs

   1 // System.Net.Sockets.Socket.cs
   2 //
   3 // Authors:
   4 //      Phillip Pearson (pp@myelin.co.nz)
   5 //      Dick Porter <dick@ximian.com>
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   7 //      Sridhar Kulkarni (sridharkulkarni@gmail.com)
   8 //      Brian Nickel (brian.nickel@gmail.com)
   9 //
  10 // Copyright (C) 2001, 2002 Phillip Pearson and Ximian, Inc.
  11 //    http://www.myelin.co.nz
  12 // (c) 2004-2011 Novell, Inc. (http://www.novell.com)
  13 //
  14
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 using System;
  37 using System.Net;
  38 using System.Collections;
  39 using System.Collections.Generic;
  40 using System.Runtime.CompilerServices;
  41 using System.Runtime.InteropServices;
  42 using System.Threading;
  43 using System.IO;
  44 using System.Security;
  45 using System.Text;
  46
  47 #if !NET_2_1
  48 using System.Net.Configuration;
  49 using System.Net.NetworkInformation;
  50 #endif
  51 #if MOONLIGHT && !INSIDE_SYSTEM
  52 using System.Net.Policy;
  53 #endif
  54
  55 namespace System.Net.Sockets {
  56
  57         public partial class Socket : IDisposable {
  58                 [StructLayout (LayoutKind.Sequential)]
  59                 struct WSABUF {
  60                         public int len;
  61                         public IntPtr buf;
  62                 }
  63
  64                 // Used by the runtime
  65                 internal enum SocketOperation {
  66                         Accept,
  67                         Connect,
  68                         Receive,
  69                         ReceiveFrom,
  70                         Send,
  71                         SendTo,
  72                         RecvJustCallback,
  73                         SendJustCallback,
  74                         UsedInProcess,
  75                         UsedInConsole2,
  76                         Disconnect,
  77                         AcceptReceive,
  78                         ReceiveGeneric,
  79                         SendGeneric
  80                 }
  81
  82                 [StructLayout (LayoutKind.Sequential)]
  83                 internal sealed class SocketAsyncResult: IAsyncResult
  84                 {
  85                         /* Same structure in the runtime */
  86                         /*
  87                           Keep this in sync with MonoSocketAsyncResult in
  88                           metadata/socket-io.h and ProcessAsyncReader
  89                           in System.Diagnostics/Process.cs.
  90                         */
  91
  92                         public Socket Sock;
  93                         public IntPtr handle;
  94                         object state;
  95                         AsyncCallback callback; // used from the runtime
  96                         WaitHandle waithandle;
  97
  98                         Exception delayedException;
  99
 100                         public EndPoint EndPoint;       // Connect,ReceiveFrom,SendTo
 101                         public byte [] Buffer;          // Receive,ReceiveFrom,Send,SendTo
 102                         public int Offset;              // Receive,ReceiveFrom,Send,SendTo
 103                         public int Size;                // Receive,ReceiveFrom,Send,SendTo
 104                         public SocketFlags SockFlags;   // Receive,ReceiveFrom,Send,SendTo
 105                         public Socket AcceptSocket;     // AcceptReceive
 106                         public IPAddress[] Addresses;   // Connect
 107                         public int Port;                // Connect
 108                         public IList<ArraySegment<byte>> Buffers;       // Receive, Send
 109                         public bool ReuseSocket;        // Disconnect
 110
 111                         // Return values
 112                         Socket acc_socket;
 113                         int total;
 114
 115                         bool completed_sync;
 116                         bool completed;
 117                         public bool blocking;
 118                         internal int error;
 119                         public SocketOperation operation;
 120                         public object ares;
 121                         public int EndCalled;
 122
 123                         // These fields are not in MonoSocketAsyncResult
 124                         public Worker Worker;
 125                         public int CurrentAddress; // Connect
 126
 127                         public SocketAsyncResult ()
 128                         {
 129                         }
 130
 131                         public void Init (Socket sock, object state, AsyncCallback callback, SocketOperation operation)
 132                         {
 133                                 this.Sock = sock;
 134                                 if (sock != null) {
 135                                         this.blocking = sock.blocking;
 136                                         this.handle = sock.socket;
 137                                 } else {
 138                                         this.blocking = true;
 139                                         this.handle = IntPtr.Zero;
 140                                 }
 141                                 this.state = state;
 142                                 this.callback = callback;
 143                                 GC.KeepAlive (this.callback);
 144                                 this.operation = operation;
 145                                 SockFlags = SocketFlags.None;
 146                                 if (waithandle != null)
 147                                         ((ManualResetEvent) waithandle).Reset ();
 148
 149                                 delayedException = null;
 150
 151                                 EndPoint = null;
 152                                 Buffer = null;
 153                                 Offset = 0;
 154                                 Size = 0;
 155                                 SockFlags = 0;
 156                                 AcceptSocket = null;
 157                                 Addresses = null;
 158                                 Port = 0;
 159                                 Buffers = null;
 160                                 ReuseSocket = false;
 161                                 acc_socket = null;
 162                                 total = 0;
 163
 164                                 completed_sync = false;
 165                                 completed = false;
 166                                 blocking = false;
 167                                 error = 0;
 168                                 ares = null;
 169                                 EndCalled = 0;
 170                                 Worker = null;
 171                         }
 172
 173                         public void DoMConnectCallback ()
 174                         {
 175                                 if (callback == null)
 176                                         return;
 177 #if MOONLIGHT
 178                                 ThreadPool.QueueUserWorkItem (_ => { callback (this); }, null);
 179 #else
 180                                 ThreadPool.UnsafeQueueUserWorkItem (_ => { callback (this); }, null);
 181 #endif
 182                         }
 183
 184                         public void Dispose ()
 185                         {
 186                                 Init (null, null, null, 0);
 187                                 if (waithandle != null) {
 188                                         waithandle.Close ();
 189                                         waithandle = null;
 190                                 }
 191                         }
 192
 193                         public SocketAsyncResult (Socket sock, object state, AsyncCallback callback, SocketOperation operation)
 194                         {
 195                                 this.Sock = sock;
 196                                 this.blocking = sock.blocking;
 197                                 this.handle = sock.socket;
 198                                 this.state = state;
 199                                 this.callback = callback;
 200                                 GC.KeepAlive (this.callback);
 201                                 this.operation = operation;
 202                                 SockFlags = SocketFlags.None;
 203                                 Worker = new Worker (this);
 204                         }
 205
 206                         public void CheckIfThrowDelayedException ()
 207                         {
 208                                 if (delayedException != null) {
 209                                         Sock.connected = false;
 210                                         throw delayedException;
 211                                 }
 212
 213                                 if (error != 0) {
 214                                         Sock.connected = false;
 215                                         throw new SocketException (error);
 216                                 }
 217                         }
 218
 219                         void CompleteAllOnDispose (Queue queue)
 220                         {
 221                                 object [] pending = queue.ToArray ();
 222                                 queue.Clear ();
 223
 224                                 WaitCallback cb;
 225                                 for (int i = 0; i < pending.Length; i++) {
 226                                         Worker worker = (Worker) pending [i];
 227                                         SocketAsyncResult ares = worker.result;
 228                                         cb = new WaitCallback (ares.CompleteDisposed);
 229 #if MOONLIGHT
 230                                         ThreadPool.QueueUserWorkItem (cb, null);
 231 #else
 232                                         ThreadPool.UnsafeQueueUserWorkItem (cb, null);
 233 #endif
 234                                 }
 235                         }
 236
 237                         void CompleteDisposed (object unused)
 238                         {
 239                                 Complete ();
 240                         }
 241
 242                         public void Complete ()
 243                         {
 244                                 if (operation != SocketOperation.Receive && Sock.disposed)
 245                                         delayedException = new ObjectDisposedException (Sock.GetType ().ToString ());
 246
 247                                 IsCompleted = true;
 248
 249                                 Queue queue = null;
 250                                 if (operation == SocketOperation.Receive ||
 251                                     operation == SocketOperation.ReceiveFrom ||
 252                                     operation == SocketOperation.ReceiveGeneric) {
 253                                         queue = Sock.readQ;
 254                                 } else if (operation == SocketOperation.Send ||
 255                                            operation == SocketOperation.SendTo ||
 256                                            operation == SocketOperation.SendGeneric) {
 257
 258                                         queue = Sock.writeQ;
 259                                 }
 260
 261                                 if (queue != null) {
 262                                         Worker worker = null;
 263                                         SocketAsyncCall sac = null;
 264                                         lock (queue) {
 265                                                 // queue.Count will only be 0 if the socket is closed while receive/send
 266                                                 // operation(s) are pending and at least one call to this method is
 267                                                 // waiting on the lock while another one calls CompleteAllOnDispose()
 268                                                 if (queue.Count > 0)
 269                                                         queue.Dequeue (); // remove ourselves
 270                                                 if (queue.Count > 0) {
 271                                                         worker = (Worker) queue.Peek ();
 272                                                         if (!Sock.disposed) {
 273                                                                 sac = Worker.Dispatcher;
 274                                                         } else {
 275                                                                 CompleteAllOnDispose (queue);
 276                                                         }
 277                                                 }
 278                                         }
 279
 280                                         if (sac != null)
 281                                                 Socket.socket_pool_queue (sac, worker.result);
 282                                 }
 283                                 // IMPORTANT: 'callback', if any is scheduled from unmanaged code
 284                         }
 285
 286                         public void Complete (bool synch)
 287                         {
 288                                 completed_sync = synch;
 289                                 Complete ();
 290                         }
 291
 292                         public void Complete (int total)
 293                         {
 294                                 this.total = total;
 295                                 Complete ();
 296                         }
 297
 298                         public void Complete (Exception e, bool synch)
 299                         {
 300                                 completed_sync = synch;
 301                                 delayedException = e;
 302                                 Complete ();
 303                         }
 304
 305                         public void Complete (Exception e)
 306                         {
 307                                 delayedException = e;
 308                                 Complete ();
 309                         }
 310
 311                         public void Complete (Socket s)
 312                         {
 313                                 acc_socket = s;
 314                                 Complete ();
 315                         }
 316
 317                         public void Complete (Socket s, int total)
 318                         {
 319                                 acc_socket = s;
 320                                 this.total = total;
 321                                 Complete ();
 322                         }
 323
 324                         public object AsyncState {
 325                                 get {
 326                                         return state;
 327                                 }
 328                         }
 329
 330                         public WaitHandle AsyncWaitHandle {
 331                                 get {
 332                                         lock (this) {
 333                                                 if (waithandle == null)
 334                                                         waithandle = new ManualResetEvent (completed);
 335                                         }
 336
 337                                         return waithandle;
 338                                 }
 339                                 set {
 340                                         waithandle=value;
 341                                 }
 342                         }
 343
 344                         public bool CompletedSynchronously {
 345                                 get {
 346                                         return(completed_sync);
 347                                 }
 348                         }
 349
 350                         public bool IsCompleted {
 351                                 get {
 352                                         return(completed);
 353                                 }
 354                                 set {
 355                                         completed=value;
 356                                         lock (this) {
 357                                                 if (waithandle != null && value) {
 358                                                         ((ManualResetEvent) waithandle).Set ();
 359                                                 }
 360                                         }
 361                                 }
 362                         }
 363
 364                         public Socket Socket {
 365                                 get {
 366                                         return acc_socket;
 367                                 }
 368                         }
 369
 370                         public int Total {
 371                                 get { return total; }
 372                                 set { total = value; }
 373                         }
 374
 375                         public SocketError ErrorCode {
 376                                 get {
 377                                         SocketException ex = delayedException as SocketException;
 378                                         if (ex != null)
 379                                                 return(ex.SocketErrorCode);
 380
 381                                         if (error != 0)
 382                                                 return((SocketError)error);
 383
 384                                         return(SocketError.Success);
 385                                 }
 386                         }
 387                 }
 388
 389                 internal sealed class Worker
 390                 {
 391                         public SocketAsyncResult result;
 392                         SocketAsyncEventArgs args;
 393
 394                         public Worker (SocketAsyncEventArgs args)
 395                         {
 396                                 this.args = args;
 397                                 result = new SocketAsyncResult ();
 398                                 result.Worker = this;
 399                         }
 400
 401                         public Worker (SocketAsyncResult ares)
 402                         {
 403                                 this.result = ares;
 404                         }
 405
 406                         public void Dispose ()
 407                         {
 408                                 if (result != null) {
 409                                         result.Dispose ();
 410                                         result = null;
 411                                         args = null;
 412                                 }
 413                         }
 414
 415                         public static SocketAsyncCall Dispatcher = new SocketAsyncCall (DispatcherCB);
 416
 417                         static void DispatcherCB (SocketAsyncResult sar)
 418                         {
 419                                 SocketOperation op = sar.operation;
 420                                 if (op == Socket.SocketOperation.Receive || op == Socket.SocketOperation.ReceiveGeneric ||
 421                                         op == Socket.SocketOperation.RecvJustCallback)
 422                                         sar.Worker.Receive ();
 423                                 else if (op == Socket.SocketOperation.Send || op == Socket.SocketOperation.SendGeneric ||
 424                                         op == Socket.SocketOperation.SendJustCallback)
 425                                         sar.Worker.Send ();
 426 #if !MOONLIGHT
 427                                 else if (op == Socket.SocketOperation.ReceiveFrom)
 428                                         sar.Worker.ReceiveFrom ();
 429                                 else if (op == Socket.SocketOperation.SendTo)
 430                                         sar.Worker.SendTo ();
 431 #endif
 432                                 else if (op == Socket.SocketOperation.Connect)
 433                                         sar.Worker.Connect ();
 434 #if !MOONLIGHT
 435                                 else if (op == Socket.SocketOperation.Accept)
 436                                         sar.Worker.Accept ();
 437                                 else if (op == Socket.SocketOperation.AcceptReceive)
 438                                         sar.Worker.AcceptReceive ();
 439                                 else if (op == Socket.SocketOperation.Disconnect)
 440                                         sar.Worker.Disconnect ();
 441
 442                                 // SendPackets and ReceiveMessageFrom are not implemented yet
 443                                 /*
 444                                 else if (op == Socket.SocketOperation.ReceiveMessageFrom)
 445                                         async_op = SocketAsyncOperation.ReceiveMessageFrom;
 446                                 else if (op == Socket.SocketOperation.SendPackets)
 447                                         async_op = SocketAsyncOperation.SendPackets;
 448                                 */
 449 #endif
 450                                 else
 451                                         throw new NotImplementedException (String.Format ("Operation {0} is not implemented", op));
 452                         }
 453
 454                         /* This is called when reusing a SocketAsyncEventArgs */
 455                         public void Init (Socket sock, SocketAsyncEventArgs args, SocketOperation op)
 456                         {
 457                                 result.Init (sock, args, SocketAsyncEventArgs.Dispatcher, op);
 458                                 result.Worker = this;
 459                                 SocketAsyncOperation async_op;
 460
 461                                 // Notes;
 462                                 //      -SocketOperation.AcceptReceive not used in SocketAsyncEventArgs
 463                                 //      -SendPackets and ReceiveMessageFrom are not implemented yet
 464                                 if (op == Socket.SocketOperation.Connect)
 465                                         async_op = SocketAsyncOperation.Connect;
 466 #if !MOONLIGHT
 467                                 else if (op == Socket.SocketOperation.Accept)
 468                                         async_op = SocketAsyncOperation.Accept;
 469                                 else if (op == Socket.SocketOperation.Disconnect)
 470                                         async_op = SocketAsyncOperation.Disconnect;
 471 #endif
 472                                 else if (op == Socket.SocketOperation.Receive || op == Socket.SocketOperation.ReceiveGeneric)
 473                                         async_op = SocketAsyncOperation.Receive;
 474 #if !MOONLIGHT
 475                                 else if (op == Socket.SocketOperation.ReceiveFrom)
 476                                         async_op = SocketAsyncOperation.ReceiveFrom;
 477 #endif
 478                                 /*
 479                                 else if (op == Socket.SocketOperation.ReceiveMessageFrom)
 480                                         async_op = SocketAsyncOperation.ReceiveMessageFrom;
 481                                 */
 482                                 else if (op == Socket.SocketOperation.Send || op == Socket.SocketOperation.SendGeneric)
 483                                         async_op = SocketAsyncOperation.Send;
 484 #if !MOONLIGHT
 485                                 /*
 486                                 else if (op == Socket.SocketOperation.SendPackets)
 487                                         async_op = SocketAsyncOperation.SendPackets;
 488                                 */
 489                                 else if (op == Socket.SocketOperation.SendTo)
 490                                         async_op = SocketAsyncOperation.SendTo;
 491 #endif
 492                                 else
 493                                         throw new NotImplementedException (String.Format ("Operation {0} is not implemented", op));
 494
 495                                 args.SetLastOperation (async_op);
 496                                 args.SocketError = SocketError.Success;
 497                                 args.BytesTransferred = 0;
 498                         }
 499
 500                         public void Accept ()
 501                         {
 502 #if !MOONLIGHT
 503                                 Socket acc_socket = null;
 504                                 try {
 505                                         if (args != null && args.AcceptSocket != null) {
 506                                                 result.Sock.Accept (args.AcceptSocket);
 507                                                 acc_socket = args.AcceptSocket;
 508                                         } else {
 509                                                 acc_socket = result.Sock.Accept ();
 510                                                 if (args != null)
 511                                                         args.AcceptSocket = acc_socket;
 512                                         }
 513                                 } catch (Exception e) {
 514                                         result.Complete (e);
 515                                         return;
 516                                 }
 517
 518                                 result.Complete (acc_socket);
 519 #endif
 520                         }
 521
 522                         /* only used in 2.0 profile and newer, but
 523                          * leave in older profiles to keep interface
 524                          * to runtime consistent
 525                          */
 526                         public void AcceptReceive ()
 527                         {
 528 #if !MOONLIGHT
 529                                 Socket acc_socket = null;
 530                                 try {
 531                                         if (result.AcceptSocket == null) {
 532                                                 acc_socket = result.Sock.Accept ();
 533                                         } else {
 534                                                 acc_socket = result.AcceptSocket;
 535                                                 result.Sock.Accept (acc_socket);
 536                                         }
 537                                 } catch (Exception e) {
 538                                         result.Complete (e);
 539                                         return;
 540                                 }
 541
 542                                 /* It seems the MS runtime
 543                                  * special-cases 0-length requested
 544                                  * receive data.  See bug 464201.
 545                                  */
 546                                 int total = 0;
 547                                 if (result.Size > 0) {
 548                                         try {
 549                                                 SocketError error;
 550                                                 total = acc_socket.Receive_nochecks (result.Buffer,
 551                                                                                      result.Offset,
 552                                                                                      result.Size,
 553                                                                                      result.SockFlags,
 554                                                                                      out error);
 555                                                 if (error != 0) {
 556                                                         result.Complete (new SocketException ((int) error));
 557                                                         return;
 558                                                 }
 559                                         } catch (Exception e) {
 560                                                 result.Complete (e);
 561                                                 return;
 562                                         }
 563                                 }
 564
 565                                 result.Complete (acc_socket, total);
 566 #endif
 567                         }
 568
 569                         public void Connect ()
 570                         {
 571                                 if (result.EndPoint == null) {
 572                                         result.Complete (new SocketException ((int)SocketError.AddressNotAvailable));
 573                                         return;
 574                                 }
 575
 576                                 SocketAsyncResult mconnect = result.AsyncState as SocketAsyncResult;
 577 #if !MOONLIGHT
 578                                 bool is_mconnect = (mconnect != null && mconnect.Addresses != null);
 579 #else
 580                                 bool is_mconnect = false;
 581 #endif
 582                                 try {
 583                                         int error_code;
 584                                         EndPoint ep = result.EndPoint;
 585                                         error_code = (int) result.Sock.GetSocketOption (SocketOptionLevel.Socket, SocketOptionName.Error);
 586                                         if (error_code == 0) {
 587                                                 if (is_mconnect)
 588                                                         result = mconnect;
 589                                                 result.Sock.seed_endpoint = ep;
 590                                                 result.Sock.connected = true;
 591                                                 result.Sock.isbound = true;
 592                                                 result.Sock.connect_in_progress = false;
 593                                                 result.error = 0;
 594                                                 result.Complete ();
 595                                                 if (is_mconnect)
 596                                                         result.DoMConnectCallback ();
 597                                                 return;
 598                                         }
 599
 600                                         if (!is_mconnect) {
 601                                                 result.Sock.connect_in_progress = false;
 602                                                 result.Complete (new SocketException (error_code));
 603                                                 return;
 604                                         }
 605
 606                                         if (mconnect.CurrentAddress >= mconnect.Addresses.Length) {
 607                                                 mconnect.Complete (new SocketException (error_code));
 608                                                 if (is_mconnect)
 609                                                         mconnect.DoMConnectCallback ();
 610                                                 return;
 611                                         }
 612                                         mconnect.Sock.BeginMConnect (mconnect);
 613                                 } catch (Exception e) {
 614                                         result.Sock.connect_in_progress = false;
 615                                         if (is_mconnect)
 616                                                 result = mconnect;
 617                                         result.Complete (e);
 618                                         if (is_mconnect)
 619                                                 result.DoMConnectCallback ();
 620                                         return;
 621                                 }
 622                         }
 623
 624                         /* Also only used in 2.0 profile and newer */
 625                         public void Disconnect ()
 626                         {
 627 #if !MOONLIGHT
 628                                 try {
 629                                         if (args != null)
 630                                                 result.ReuseSocket = args.DisconnectReuseSocket;
 631                                         result.Sock.Disconnect (result.ReuseSocket);
 632                                 } catch (Exception e) {
 633                                         result.Complete (e);
 634                                         return;
 635                                 }
 636                                 result.Complete ();
 637 #endif
 638                         }
 639
 640                         public void Receive ()
 641                         {
 642                                 if (result.operation == SocketOperation.ReceiveGeneric) {
 643                                         ReceiveGeneric ();
 644                                         return;
 645                                 }
 646                                 // Actual recv() done in the runtime
 647                                 result.Complete ();
 648                         }
 649
 650                         public void ReceiveFrom ()
 651                         {
 652 #if !MOONLIGHT
 653                                 int total = 0;
 654                                 try {
 655                                         total = result.Sock.ReceiveFrom_nochecks (result.Buffer,
 656                                                                          result.Offset,
 657                                                                          result.Size,
 658                                                                          result.SockFlags,
 659                                                                          ref result.EndPoint);
 660                                 } catch (Exception e) {
 661                                         result.Complete (e);
 662                                         return;
 663                                 }
 664
 665                                 result.Complete (total);
 666 #endif
 667                         }
 668
 669                         public void ReceiveGeneric ()
 670                         {
 671                                 int total = 0;
 672                                 try {
 673                                         total = result.Sock.Receive (result.Buffers, result.SockFlags);
 674                                 } catch (Exception e) {
 675                                         result.Complete (e);
 676                                         return;
 677                                 }
 678                                 result.Complete (total);
 679                         }
 680
 681                         int send_so_far;
 682
 683                         void UpdateSendValues (int last_sent)
 684                         {
 685                                 if (result.error == 0) {
 686                                         send_so_far += last_sent;
 687                                         result.Offset += last_sent;
 688                                         result.Size -= last_sent;
 689                                 }
 690                         }
 691
 692                         public void Send ()
 693                         {
 694                                 if (result.operation == SocketOperation.SendGeneric) {
 695                                         SendGeneric ();
 696                                         return;
 697                                 }
 698                                 // Actual send() done in the runtime
 699                                 if (result.error == 0) {
 700                                         UpdateSendValues (result.Total);
 701                                         if (result.Sock.disposed) {
 702                                                 result.Complete ();
 703                                                 return;
 704                                         }
 705
 706                                         if (result.Size > 0) {
 707                                                 Socket.socket_pool_queue (Worker.Dispatcher, result);
 708                                                 return; // Have to finish writing everything. See bug #74475.
 709                                         }
 710                                         result.Total = send_so_far;
 711                                 }
 712                                 result.Complete ();
 713                         }
 714
 715                         public void SendTo ()
 716                         {
 717 #if !MOONLIGHT
 718                                 int total = 0;
 719                                 try {
 720                                         total = result.Sock.SendTo_nochecks (result.Buffer,
 721                                                                     result.Offset,
 722                                                                     result.Size,
 723                                                                     result.SockFlags,
 724                                                                     result.EndPoint);
 725
 726                                         UpdateSendValues (total);
 727                                         if (result.Size > 0) {
 728                                                 Socket.socket_pool_queue (Worker.Dispatcher, result);
 729                                                 return; // Have to finish writing everything. See bug #74475.
 730                                         }
 731                                         result.Total = send_so_far;
 732                                 } catch (Exception e) {
 733                                         result.Complete (e);
 734                                         return;
 735                                 }
 736
 737                                 result.Complete ();
 738 #endif
 739                         }
 740
 741                         public void SendGeneric ()
 742                         {
 743                                 int total = 0;
 744                                 try {
 745                                         total = result.Sock.Send (result.Buffers, result.SockFlags);
 746                                 } catch (Exception e) {
 747                                         result.Complete (e);
 748                                         return;
 749                                 }
 750                                 result.Complete (total);
 751                         }
 752                 }
 753
 754                 private Queue readQ = new Queue (2);
 755                 private Queue writeQ = new Queue (2);
 756
 757                 internal delegate void SocketAsyncCall (SocketAsyncResult sar);
 758
 759                 /*
 760                  *      These two fields are looked up by name by the runtime, don't change
 761                  *  their name without also updating the runtime code.
 762                  */
 763                 private static int ipv4Supported = -1, ipv6Supported = -1;
 764                 int linger_timeout;
 765
 766                 static Socket ()
 767                 {
 768                         // initialize ipv4Supported and ipv6Supported
 769                         CheckProtocolSupport ();
 770                 }
 771
 772                 internal static void CheckProtocolSupport ()
 773                 {
 774                         if(ipv4Supported == -1) {
 775                                 try {
 776                                         Socket tmp = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
 777                                         tmp.Close();
 778
 779                                         ipv4Supported = 1;
 780                                 } catch {
 781                                         ipv4Supported = 0;
 782                                 }
 783                         }
 784
 785                         if (ipv6Supported == -1) {
 786 #if !NET_2_1
 787 #if CONFIGURATION_DEP
 788                                 SettingsSection config;
 789                                 config = (SettingsSection) System.Configuration.ConfigurationManager.GetSection ("system.net/settings");
 790                                 if (config != null)
 791                                         ipv6Supported = config.Ipv6.Enabled ? -1 : 0;
 792 #else
 793                                 NetConfig config = System.Configuration.ConfigurationSettings.GetConfig("system.net/settings") as NetConfig;
 794                                 if (config != null)
 795                                         ipv6Supported = config.ipv6Enabled ? -1 : 0;
 796 #endif
 797 #endif
 798                                 if (ipv6Supported != 0) {
 799                                         try {
 800                                                 Socket tmp = new Socket(AddressFamily.InterNetworkV6, SocketType.Stream, ProtocolType.Tcp);
 801                                                 tmp.Close();
 802
 803                                                 ipv6Supported = 1;
 804                                         } catch {
 805                                                 ipv6Supported = 0;
 806                                         }
 807                                 }
 808                         }
 809                 }
 810
 811                 public static bool SupportsIPv4 {
 812                         get {
 813                                 CheckProtocolSupport();
 814                                 return ipv4Supported == 1;
 815                         }
 816                 }
 817
 818                 [ObsoleteAttribute ("Use OSSupportsIPv6 instead")]
 819                 public static bool SupportsIPv6 {
 820                         get {
 821                                 CheckProtocolSupport();
 822                                 return ipv6Supported == 1;
 823                         }
 824                 }
 825 #if NET_2_1
 826                 public static bool OSSupportsIPv4 {
 827                         get {
 828                                 CheckProtocolSupport();
 829                                 return ipv4Supported == 1;
 830                         }
 831                 }
 832 #endif
 833 #if NET_2_1
 834                 public static bool OSSupportsIPv6 {
 835                         get {
 836                                 CheckProtocolSupport();
 837                                 return ipv6Supported == 1;
 838                         }
 839                 }
 840 #else
 841                 public static bool OSSupportsIPv6 {
 842                         get {
 843                                 NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces ();
 844
 845                                 foreach (NetworkInterface adapter in nics) {
 846                                         if (adapter.Supports (NetworkInterfaceComponent.IPv6))
 847                                                 return true;
 848                                 }
 849                                 return false;
 850                         }
 851                 }
 852 #endif
 853
 854                 /* the field "socket" is looked up by name by the runtime */
 855                 private IntPtr socket;
 856                 private AddressFamily address_family;
 857                 private SocketType socket_type;
 858                 private ProtocolType protocol_type;
 859                 internal bool blocking=true;
 860                 Thread blocking_thread;
 861                 private bool isbound;
 862                 /* When true, the socket was connected at the time of
 863                  * the last IO operation
 864                  */
 865                 private bool connected;
 866                 /* true if we called Close_internal */
 867                 private bool closed;
 868                 internal bool disposed;
 869                 bool connect_in_progress;
 870
 871                 /*
 872                  * This EndPoint is used when creating new endpoints. Because
 873                  * there are many types of EndPoints possible,
 874                  * seed_endpoint.Create(addr) is used for creating new ones.
 875                  * As such, this value is set on Bind, SentTo, ReceiveFrom,
 876                  * Connect, etc.
 877                  */
 878                 internal EndPoint seed_endpoint = null;
 879
 880 #if !TARGET_JVM
 881                 // Creates a new system socket, returning the handle
 882                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 883                 private extern IntPtr Socket_internal(AddressFamily family,
 884                                                       SocketType type,
 885                                                       ProtocolType proto,
 886                                                       out int error);
 887 #endif
 888
 889                 public Socket(AddressFamily addressFamily, SocketType socketType, ProtocolType protocolType)
 890                 {
 891 #if NET_2_1 && !MOBILE
 892                         switch (addressFamily) {
 893                         case AddressFamily.InterNetwork:        // ok
 894                         case AddressFamily.InterNetworkV6:      // ok
 895                         case AddressFamily.Unknown:             // SocketException will be thrown later (with right error #)
 896                                 break;
 897                         // case AddressFamily.Unspecified:
 898                         default:
 899                                 throw new ArgumentException ("addressFamily");
 900                         }
 901
 902                         switch (socketType) {
 903                         case SocketType.Stream:                 // ok
 904                         case SocketType.Unknown:                // SocketException will be thrown later (with right error #)
 905                                 break;
 906                         default:
 907                                 throw new ArgumentException ("socketType");
 908                         }
 909
 910                         switch (protocolType) {
 911                         case ProtocolType.Tcp:                  // ok
 912                         case ProtocolType.Unspecified:          // ok
 913                         case ProtocolType.Unknown:              // SocketException will be thrown later (with right error #)
 914                                 break;
 915                         default:
 916                                 throw new ArgumentException ("protocolType");
 917                         }
 918 #endif
 919                         address_family = addressFamily;
 920                         socket_type = socketType;
 921                         protocol_type = protocolType;
 922
 923                         int error;
 924
 925                         socket = Socket_internal (addressFamily, socketType, protocolType, out error);
 926                         if (error != 0)
 927                                 throw new SocketException (error);
 928 #if !NET_2_1 || MOBILE
 929                         SocketDefaults ();
 930 #endif
 931                 }
 932
 933                 ~Socket ()
 934                 {
 935                         Dispose (false);
 936                 }
 937
 938
 939                 public AddressFamily AddressFamily {
 940                         get { return address_family; }
 941                 }
 942
 943 #if !TARGET_JVM
 944                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 945                 private extern static void Blocking_internal(IntPtr socket,
 946                                                              bool block,
 947                                                              out int error);
 948 #endif
 949
 950                 public bool Blocking {
 951                         get {
 952                                 return(blocking);
 953                         }
 954                         set {
 955                                 if (disposed && closed)
 956                                         throw new ObjectDisposedException (GetType ().ToString ());
 957
 958                                 int error;
 959
 960                                 Blocking_internal (socket, value, out error);
 961
 962                                 if (error != 0)
 963                                         throw new SocketException (error);
 964
 965                                 blocking=value;
 966                         }
 967                 }
 968
 969                 public bool Connected {
 970                         get { return connected; }
 971                         internal set { connected = value; }
 972                 }
 973
 974                 public ProtocolType ProtocolType {
 975                         get { return protocol_type; }
 976                 }
 977
 978                 public bool NoDelay {
 979                         get {
 980                                 if (disposed && closed)
 981                                         throw new ObjectDisposedException (GetType ().ToString ());
 982
 983                                 ThrowIfUpd ();
 984
 985                                 return (int)(GetSocketOption (
 986                                         SocketOptionLevel.Tcp,
 987                                         SocketOptionName.NoDelay)) != 0;
 988                         }
 989
 990                         set {
 991                                 if (disposed && closed)
 992                                         throw new ObjectDisposedException (GetType ().ToString ());
 993
 994                                 ThrowIfUpd ();
 995
 996                                 SetSocketOption (
 997                                         SocketOptionLevel.Tcp,
 998                                         SocketOptionName.NoDelay, value ? 1 : 0);
 999                         }
1000                 }
1001
1002                 public int ReceiveBufferSize {
1003                         get {
1004                                 if (disposed && closed) {
1005                                         throw new ObjectDisposedException (GetType ().ToString ());
1006                                 }
1007                                 return((int)GetSocketOption (SocketOptionLevel.Socket, SocketOptionName.ReceiveBuffer));
1008                         }
1009                         set {
1010                                 if (disposed && closed) {
1011                                         throw new ObjectDisposedException (GetType ().ToString ());
1012                                 }
1013                                 if (value < 0) {
1014                                         throw new ArgumentOutOfRangeException ("value", "The value specified for a set operation is less than zero");
1015                                 }
1016
1017                                 SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.ReceiveBuffer, value);
1018                         }
1019                 }
1020
1021                 public int SendBufferSize {
1022                         get {
1023                                 if (disposed && closed) {
1024                                         throw new ObjectDisposedException (GetType ().ToString ());
1025                                 }
1026                                 return((int)GetSocketOption (SocketOptionLevel.Socket, SocketOptionName.SendBuffer));
1027                         }
1028                         set {
1029                                 if (disposed && closed) {
1030                                         throw new ObjectDisposedException (GetType ().ToString ());
1031                                 }
1032                                 if (value < 0) {
1033                                         throw new ArgumentOutOfRangeException ("value", "The value specified for a set operation is less than zero");
1034                                 }
1035
1036                                 SetSocketOption (SocketOptionLevel.Socket,
1037                                                  SocketOptionName.SendBuffer,
1038                                                  value);
1039                         }
1040                 }
1041
1042                 public short Ttl {
1043                         get {
1044                                 if (disposed && closed) {
1045                                         throw new ObjectDisposedException (GetType ().ToString ());
1046                                 }
1047
1048                                 short ttl_val;
1049
1050                                 if (address_family == AddressFamily.InterNetwork) {
1051                                         ttl_val = (short)((int)GetSocketOption (SocketOptionLevel.IP, SocketOptionName.IpTimeToLive));
1052                                 } else if (address_family == AddressFamily.InterNetworkV6) {
1053                                         ttl_val = (short)((int)GetSocketOption (SocketOptionLevel.IPv6, SocketOptionName.HopLimit));
1054                                 } else {
1055                                         throw new NotSupportedException ("This property is only valid for InterNetwork and InterNetworkV6 sockets");
1056                                 }
1057
1058                                 return(ttl_val);
1059                         }
1060                         set {
1061                                 if (disposed && closed) {
1062                                         throw new ObjectDisposedException (GetType ().ToString ());
1063                                 }
1064                                 if (value < 0) {
1065                                         throw new ArgumentOutOfRangeException ("value", "The value specified for a set operation is less than zero");
1066                                 }
1067
1068                                 if (address_family == AddressFamily.InterNetwork) {
1069                                         SetSocketOption (SocketOptionLevel.IP, SocketOptionName.IpTimeToLive, value);
1070                                 } else if (address_family == AddressFamily.InterNetworkV6) {
1071                                         SetSocketOption (SocketOptionLevel.IPv6, SocketOptionName.HopLimit, value);
1072                                 } else {
1073                                         throw new NotSupportedException ("This property is only valid for InterNetwork and InterNetworkV6 sockets");
1074                                 }
1075                         }
1076                 }
1077
1078                 // Returns the remote endpoint details in addr and port
1079                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
1080                 private extern static SocketAddress RemoteEndPoint_internal(IntPtr socket, int family, out int error);
1081
1082                 public EndPoint RemoteEndPoint {
1083                         get {
1084                                 if (disposed && closed)
1085                                         throw new ObjectDisposedException (GetType ().ToString ());
1086
1087 #if MOONLIGHT
1088                                 if (!connected)
1089                                         return seed_endpoint;
1090 #else
1091                                 /*
1092                                  * If the seed EndPoint is null, Connect, Bind,
1093                                  * etc has not yet been called. MS returns null
1094                                  * in this case.
1095                                  */
1096                                 if (!connected || seed_endpoint == null)
1097                                         return null;
1098 #endif
1099                                 SocketAddress sa;
1100                                 int error;
1101
1102                                 sa=RemoteEndPoint_internal(socket, (int) address_family, out error);
1103
1104                                 if (error != 0)
1105                                         throw new SocketException (error);
1106
1107                                 return seed_endpoint.Create (sa);
1108                         }
1109                 }
1110
1111                 void Linger (IntPtr handle)
1112                 {
1113                         if (!connected || linger_timeout <= 0)
1114                                 return;
1115
1116                         // We don't want to receive any more data
1117                         int error;
1118                         Shutdown_internal (handle, SocketShutdown.Receive, out error);
1119                         if (error != 0)
1120                                 return;
1121
1122                         int seconds = linger_timeout / 1000;
1123                         int ms = linger_timeout % 1000;
1124                         if (ms > 0) {
1125                                 // If the other end closes, this will return 'true' with 'Available' == 0
1126                                 Poll_internal (handle, SelectMode.SelectRead, ms * 1000, out error);
1127                                 if (error != 0)
1128                                         return;
1129
1130                         }
1131                         if (seconds > 0) {
1132                                 LingerOption linger = new LingerOption (true, seconds);
1133                                 SetSocketOption_internal (handle, SocketOptionLevel.Socket, SocketOptionName.Linger, linger, null, 0, out error);
1134                                 /* Not needed, we're closing upon return */
1135                                 /*if (error != 0)
1136                                         return; */
1137                         }
1138                 }
1139
1140                 protected virtual void Dispose (bool disposing)
1141                 {
1142                         if (disposed)
1143                                 return;
1144
1145                         disposed = true;
1146                         bool was_connected = connected;
1147                         connected = false;
1148                         if ((int) socket != -1) {
1149                                 int error;
1150                                 closed = true;
1151                                 IntPtr x = socket;
1152                                 socket = (IntPtr) (-1);
1153                                 Thread th = blocking_thread;
1154                                 if (th != null) {
1155                                         th.Abort ();
1156                                         blocking_thread = null;
1157                                 }
1158
1159                                 if (was_connected)
1160                                         Linger (x);
1161                                 //DateTime start = DateTime.UtcNow;
1162                                 Close_internal (x, out error);
1163                                 //Console.WriteLine ("Time spent in Close_internal: {0}ms", (DateTime.UtcNow - start).TotalMilliseconds);
1164                                 if (error != 0)
1165                                         throw new SocketException (error);
1166                         }
1167                 }
1168
1169 #if NET_2_1 || NET_4_0
1170                 public void Dispose ()
1171 #else
1172                 void IDisposable.Dispose ()
1173 #endif
1174                 {
1175                         Dispose (true);
1176                         GC.SuppressFinalize (this);
1177                 }
1178
1179                 // Closes the socket
1180                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
1181                 private extern static void Close_internal(IntPtr socket, out int error);
1182
1183                 public void Close ()
1184                 {
1185                         linger_timeout = 0;
1186                         ((IDisposable) this).Dispose ();
1187                 }
1188
1189                 public void Close (int timeout)
1190                 {
1191                         linger_timeout = timeout;
1192                         ((IDisposable) this).Dispose ();
1193                 }
1194
1195                 // Connects to the remote address
1196                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
1197                 private extern static void Connect_internal(IntPtr sock,
1198                                                             SocketAddress sa,
1199                                                             out int error);
1200
1201                 public void Connect (EndPoint remoteEP)
1202                 {
1203                         SocketAddress serial = null;
1204
1205                         if (disposed && closed)
1206                                 throw new ObjectDisposedException (GetType ().ToString ());
1207
1208                         if (remoteEP == null)
1209                                 throw new ArgumentNullException ("remoteEP");
1210
1211                         IPEndPoint ep = remoteEP as IPEndPoint;
1212 #if !MOONLIGHT
1213                         if (ep != null && socket_type != SocketType.Dgram) /* Dgram uses Any to 'disconnect' */
1214 #else
1215                         if (ep != null)
1216 #endif
1217                                 if (ep.Address.Equals (IPAddress.Any) || ep.Address.Equals (IPAddress.IPv6Any))
1218                                         throw new SocketException ((int) SocketError.AddressNotAvailable);
1219
1220 #if MOONLIGHT
1221                         if (protocol_type != ProtocolType.Tcp)
1222                                 throw new SocketException ((int) SocketError.AccessDenied);
1223 #else
1224                         if (islistening)
1225                                 throw new InvalidOperationException ();
1226 #endif
1227                         serial = remoteEP.Serialize ();
1228
1229                         int error = 0;
1230
1231                         blocking_thread = Thread.CurrentThread;
1232                         try {
1233                                 Connect_internal (socket, serial, out error);
1234                         } catch (ThreadAbortException) {
1235                                 if (disposed) {
1236                                         Thread.ResetAbort ();
1237                                         error = (int) SocketError.Interrupted;
1238                                 }
1239                         } finally {
1240                                 blocking_thread = null;
1241                         }
1242
1243                         if (error == 0 || error == 10035)
1244                                 seed_endpoint = remoteEP; // Keep the ep around for non-blocking sockets
1245
1246                         if (error != 0)
1247                                 throw new SocketException (error);
1248
1249 #if !MOONLIGHT
1250                         if (socket_type == SocketType.Dgram && (ep.Address.Equals (IPAddress.Any) || ep.Address.Equals (IPAddress.IPv6Any)))
1251                                 connected = false;
1252                         else
1253                                 connected = true;
1254 #else
1255                         connected = true;
1256 #endif
1257                         isbound = true;
1258                 }
1259
1260                 public bool ReceiveAsync (SocketAsyncEventArgs e)
1261                 {
1262                         // NO check is made whether e != null in MS.NET (NRE is thrown in such case)
1263                         if (disposed && closed)
1264                                 throw new ObjectDisposedException (GetType ().ToString ());
1265
1266                         // LAME SPEC: the ArgumentException is never thrown, instead an NRE is
1267                         // thrown when e.Buffer and e.BufferList are null (works fine when one is
1268                         // set to a valid object)
1269                         if (e.Buffer == null && e.BufferList == null)
1270                                 throw new NullReferenceException ("Either e.Buffer or e.BufferList must be valid buffers.");
1271
1272                         e.curSocket = this;
1273                         SocketOperation op = (e.Buffer != null) ? SocketOperation.Receive : SocketOperation.ReceiveGeneric;
1274                         e.Worker.Init (this, e, op);
1275                         SocketAsyncResult res = e.Worker.result;
1276                         if (e.Buffer != null) {
1277                                 res.Buffer = e.Buffer;
1278                                 res.Offset = e.Offset;
1279                                 res.Size = e.Count;
1280                         } else {
1281                                 res.Buffers = e.BufferList;
1282                         }
1283                         res.SockFlags = e.SocketFlags;
1284                         int count;
1285                         lock (readQ) {
1286                                 readQ.Enqueue (e.Worker);
1287                                 count = readQ.Count;
1288                         }
1289                         if (count == 1) {
1290                                 // Receive takes care of ReceiveGeneric
1291                                 socket_pool_queue (Worker.Dispatcher, res);
1292                         }
1293
1294                         return true;
1295                 }
1296
1297                 public bool SendAsync (SocketAsyncEventArgs e)
1298                 {
1299                         // NO check is made whether e != null in MS.NET (NRE is thrown in such case)
1300                         if (disposed && closed)
1301                                 throw new ObjectDisposedException (GetType ().ToString ());
1302                         if (e.Buffer == null && e.BufferList == null)
1303                                 throw new NullReferenceException ("Either e.Buffer or e.BufferList must be valid buffers.");
1304
1305                         e.curSocket = this;
1306                         SocketOperation op = (e.Buffer != null) ? SocketOperation.Send : SocketOperation.SendGeneric;
1307                         e.Worker.Init (this, e, op);
1308                         SocketAsyncResult res = e.Worker.result;
1309                         if (e.Buffer != null) {
1310                                 res.Buffer = e.Buffer;
1311                                 res.Offset = e.Offset;
1312                                 res.Size = e.Count;
1313                         } else {
1314                                 res.Buffers = e.BufferList;
1315                         }
1316                         res.SockFlags = e.SocketFlags;
1317                         int count;
1318                         lock (writeQ) {
1319                                 writeQ.Enqueue (e.Worker);
1320                                 count = writeQ.Count;
1321                         }
1322                         if (count == 1) {
1323                                 // Send takes care of SendGeneric
1324                                 socket_pool_queue (Worker.Dispatcher, res);
1325                         }
1326                         return true;
1327                 }
1328
1329                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
1330                 extern static bool Poll_internal (IntPtr socket, SelectMode mode, int timeout, out int error);
1331
1332                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
1333                 private extern static int Receive_internal(IntPtr sock,
1334                                                            byte[] buffer,
1335                                                            int offset,
1336                                                            int count,
1337                                                            SocketFlags flags,
1338                                                            out int error);
1339
1340                 internal int Receive_nochecks (byte [] buf, int offset, int size, SocketFlags flags, out SocketError error)
1341                 {
1342                         int nativeError;
1343                         int ret = Receive_internal (socket, buf, offset, size, flags, out nativeError);
1344                         error = (SocketError) nativeError;
1345                         if (error != SocketError.Success && error != SocketError.WouldBlock && error != SocketError.InProgress) {
1346                                 connected = false;
1347                                 isbound = false;
1348                         } else {
1349                                 connected = true;
1350                         }
1351
1352                         return ret;
1353                 }
1354
1355                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
1356                 private extern static void GetSocketOption_obj_internal(IntPtr socket,
1357                         SocketOptionLevel level, SocketOptionName name, out object obj_val,
1358                         out int error);
1359
1360                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
1361                 private extern static int Send_internal(IntPtr sock,
1362                                                         byte[] buf, int offset,
1363                                                         int count,
1364                                                         SocketFlags flags,
1365                                                         out int error);
1366
1367                 internal int Send_nochecks (byte [] buf, int offset, int size, SocketFlags flags, out SocketError error)
1368                 {
1369                         if (size == 0) {
1370                                 error = SocketError.Success;
1371                                 return 0;
1372                         }
1373
1374                         int nativeError;
1375
1376                         int ret = Send_internal (socket, buf, offset, size, flags, out nativeError);
1377
1378                         error = (SocketError)nativeError;
1379
1380                         if (error != SocketError.Success && error != SocketError.WouldBlock && error != SocketError.InProgress) {
1381                                 connected = false;
1382                                 isbound = false;
1383                         } else {
1384                                 connected = true;
1385                         }
1386
1387                         return ret;
1388                 }
1389
1390                 public object GetSocketOption (SocketOptionLevel optionLevel, SocketOptionName optionName)
1391                 {
1392                         if (disposed && closed)
1393                                 throw new ObjectDisposedException (GetType ().ToString ());
1394
1395                         object obj_val;
1396                         int error;
1397
1398                         GetSocketOption_obj_internal (socket, optionLevel, optionName, out obj_val,
1399                                 out error);
1400                         if (error != 0)
1401                                 throw new SocketException (error);
1402
1403                         if (optionName == SocketOptionName.Linger) {
1404                                 return((LingerOption)obj_val);
1405                         } else if (optionName == SocketOptionName.AddMembership ||
1406                                    optionName == SocketOptionName.DropMembership) {
1407                                 return((MulticastOption)obj_val);
1408                         } else if (obj_val is int) {
1409                                 return((int)obj_val);
1410                         } else {
1411                                 return(obj_val);
1412                         }
1413                 }
1414
1415                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
1416                 private extern static void Shutdown_internal (IntPtr socket, SocketShutdown how, out int error);
1417
1418                 public void Shutdown (SocketShutdown how)
1419                 {
1420                         if (disposed && closed)
1421                                 throw new ObjectDisposedException (GetType ().ToString ());
1422
1423                         if (!connected)
1424                                 throw new SocketException (10057); // Not connected
1425
1426                         int error;
1427
1428                         Shutdown_internal (socket, how, out error);
1429                         if (error != 0)
1430                                 throw new SocketException (error);
1431                 }
1432
1433                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
1434                 private extern static void SetSocketOption_internal (IntPtr socket, SocketOptionLevel level,
1435                                                                      SocketOptionName name, object obj_val,
1436                                                                      byte [] byte_val, int int_val,
1437                                                                      out int error);
1438
1439                 public void SetSocketOption (SocketOptionLevel optionLevel, SocketOptionName optionName, int optionValue)
1440                 {
1441                         if (disposed && closed)
1442                                 throw new ObjectDisposedException (GetType ().ToString ());
1443
1444                         int error;
1445
1446                         SetSocketOption_internal (socket, optionLevel, optionName, null,
1447                                                  null, optionValue, out error);
1448
1449                         if (error != 0)
1450                                 throw new SocketException (error);
1451                 }
1452
1453                 private void ThrowIfUpd ()
1454                 {
1455 #if !NET_2_1 || MOBILE
1456                         if (protocol_type == ProtocolType.Udp)
1457                                 throw new SocketException ((int)SocketError.ProtocolOption);
1458 #endif
1459                 }
1460
1461 #if !MOONLIGHT
1462                 public
1463 #endif
1464                 IAsyncResult BeginConnect(EndPoint end_point, AsyncCallback callback, object state)
1465                 {
1466                         if (disposed && closed)
1467                                 throw new ObjectDisposedException (GetType ().ToString ());
1468
1469                         if (end_point == null)
1470                                 throw new ArgumentNullException ("end_point");
1471
1472                         SocketAsyncResult req = new SocketAsyncResult (this, state, callback, SocketOperation.Connect);
1473                         req.EndPoint = end_point;
1474
1475                         // Bug #75154: Connect() should not succeed for .Any addresses.
1476                         if (end_point is IPEndPoint) {
1477                                 IPEndPoint ep = (IPEndPoint) end_point;
1478                                 if (ep.Address.Equals (IPAddress.Any) || ep.Address.Equals (IPAddress.IPv6Any)) {
1479                                         req.Complete (new SocketException ((int) SocketError.AddressNotAvailable), true);
1480                                         return req;
1481                                 }
1482                         }
1483
1484                         int error = 0;
1485                         if (connect_in_progress) {
1486                                 // This could happen when multiple IPs are used
1487                                 // Calling connect() again will reset the connection attempt and cause
1488                                 // an error. Better to just close the socket and move on.
1489                                 connect_in_progress = false;
1490                                 Close_internal (socket, out error);
1491                                 socket = Socket_internal (address_family, socket_type, protocol_type, out error);
1492                                 if (error != 0)
1493                                         throw new SocketException (error);
1494                         }
1495                         bool blk = blocking;
1496                         if (blk)
1497                                 Blocking = false;
1498                         SocketAddress serial = end_point.Serialize ();
1499                         Connect_internal (socket, serial, out error);
1500                         if (blk)
1501                                 Blocking = true;
1502                         if (error == 0) {
1503                                 // succeeded synch
1504                                 connected = true;
1505                                 isbound = true;
1506                                 req.Complete (true);
1507                                 return req;
1508                         }
1509
1510                         if (error != (int) SocketError.InProgress && error != (int) SocketError.WouldBlock) {
1511                                 // error synch
1512                                 connected = false;
1513                                 isbound = false;
1514                                 req.Complete (new SocketException (error), true);
1515                                 return req;
1516                         }
1517
1518                         // continue asynch
1519                         connected = false;
1520                         isbound = false;
1521                         connect_in_progress = true;
1522                         socket_pool_queue (Worker.Dispatcher, req);
1523                         return req;
1524                 }
1525
1526 #if !MOONLIGHT
1527                 public
1528 #else
1529                 internal
1530 #endif
1531                 IAsyncResult BeginConnect (IPAddress[] addresses, int port, AsyncCallback callback, object state)
1532
1533                 {
1534                         if (disposed && closed)
1535                                 throw new ObjectDisposedException (GetType ().ToString ());
1536
1537                         if (addresses == null)
1538                                 throw new ArgumentNullException ("addresses");
1539
1540                         if (addresses.Length == 0)
1541                                 throw new ArgumentException ("Empty addresses list");
1542
1543                         if (this.AddressFamily != AddressFamily.InterNetwork &&
1544                                 this.AddressFamily != AddressFamily.InterNetworkV6)
1545                                 throw new NotSupportedException ("This method is only valid for addresses in the InterNetwork or InterNetworkV6 families");
1546
1547                         if (port <= 0 || port > 65535)
1548                                 throw new ArgumentOutOfRangeException ("port", "Must be > 0 and < 65536");
1549 #if !MOONLIGHT
1550                         if (islistening)
1551                                 throw new InvalidOperationException ();
1552 #endif
1553
1554                         SocketAsyncResult req = new SocketAsyncResult (this, state, callback, SocketOperation.Connect);
1555                         req.Addresses = addresses;
1556                         req.Port = port;
1557                         connected = false;
1558                         return BeginMConnect (req);
1559                 }
1560
1561                 IAsyncResult BeginMConnect (SocketAsyncResult req)
1562                 {
1563                         IAsyncResult ares = null;
1564                         Exception exc = null;
1565                         for (int i = req.CurrentAddress; i < req.Addresses.Length; i++) {
1566                                 IPAddress addr = req.Addresses [i];
1567                                 IPEndPoint ep = new IPEndPoint (addr, req.Port);
1568                                 try {
1569                                         req.CurrentAddress++;
1570                                         ares = BeginConnect (ep, null, req);
1571                                         if (ares.IsCompleted && ares.CompletedSynchronously) {
1572                                                 ((SocketAsyncResult) ares).CheckIfThrowDelayedException ();
1573                                                 req.DoMConnectCallback ();
1574                                         }
1575                                         break;
1576                                 } catch (Exception e) {
1577                                         exc = e;
1578                                         ares = null;
1579                                 }
1580                         }
1581
1582                         if (ares == null)
1583                                 throw exc;
1584
1585                         return req;
1586                 }
1587
1588                 // Returns false when it is ok to use RemoteEndPoint
1589                 //         true when addresses must be used (and addresses could be null/empty)
1590                 bool GetCheckedIPs (SocketAsyncEventArgs e, out IPAddress [] addresses)
1591                 {
1592                         addresses = null;
1593 #if MOONLIGHT || NET_4_0
1594                         // Connect to the first address that match the host name, like:
1595                         // http://blogs.msdn.com/ncl/archive/2009/07/20/new-ncl-features-in-net-4-0-beta-2.aspx
1596                         // while skipping entries that do not match the address family
1597                         DnsEndPoint dep = (e.RemoteEndPoint as DnsEndPoint);
1598                         if (dep != null) {
1599                                 addresses = Dns.GetHostAddresses (dep.Host);
1600                                 IPEndPoint endpoint;
1601 #if MOONLIGHT && !INSIDE_SYSTEM
1602                                 if (!e.PolicyRestricted && !SecurityManager.HasElevatedPermissions) {
1603                                         List<IPAddress> valid = new List<IPAddress> ();
1604                                         foreach (IPAddress a in addresses) {
1605                                                 // if we're not downloading a socket policy then check the policy
1606                                                 // and if we're not running with elevated permissions (SL4 OoB option)
1607                                                 endpoint = new IPEndPoint (a, dep.Port);
1608                                                 if (!CrossDomainPolicyManager.CheckEndPoint (endpoint, e.SocketClientAccessPolicyProtocol))
1609                                                         continue;
1610                                                 valid.Add (a);
1611                                         }
1612                                         addresses = valid.ToArray ();
1613                                 }
1614 #endif
1615                                 return true;
1616                         } else {
1617                                 e.ConnectByNameError = null;
1618 #if MOONLIGHT && !INSIDE_SYSTEM
1619                                 if (!e.PolicyRestricted && !SecurityManager.HasElevatedPermissions) {
1620                                         if (CrossDomainPolicyManager.CheckEndPoint (e.RemoteEndPoint, e.SocketClientAccessPolicyProtocol))
1621                                                 return false;
1622                                 } else
1623 #endif
1624                                         return false;
1625                         }
1626                         return true; // do not use remote endpoint
1627 #else
1628                         return false; // < NET_4_0 -> use remote endpoint
1629 #endif
1630                 }
1631
1632                 bool ConnectAsyncReal (SocketAsyncEventArgs e)
1633                 {
1634                         IPAddress [] addresses = null;
1635                         bool use_remoteep = true;
1636 #if MOONLIGHT || NET_4_0
1637                         use_remoteep = !GetCheckedIPs (e, out addresses);
1638 #endif
1639                         e.curSocket = this;
1640                         Worker w = e.Worker;
1641                         w.Init (this, e, SocketOperation.Connect);
1642                         SocketAsyncResult result = w.result;
1643                         IAsyncResult ares = null;
1644                         try {
1645                                 if (use_remoteep) {
1646                                         result.EndPoint = e.RemoteEndPoint;
1647                                         ares = BeginConnect (e.RemoteEndPoint, SocketAsyncEventArgs.Dispatcher, e);
1648                                 }
1649 #if MOONLIGHT || NET_4_0
1650                                 else {
1651
1652                                         DnsEndPoint dep = (e.RemoteEndPoint as DnsEndPoint);
1653                                         result.Addresses = addresses;
1654                                         result.Port = dep.Port;
1655
1656                                         ares = BeginConnect (addresses, dep.Port, SocketAsyncEventArgs.Dispatcher, e);
1657                                 }
1658 #endif
1659                                 if (ares.IsCompleted && ares.CompletedSynchronously) {
1660                                         ((SocketAsyncResult) ares).CheckIfThrowDelayedException ();
1661                                         return false;
1662                                 }
1663                         } catch (Exception exc) {
1664                                 result.Complete (exc, true);
1665                                 return false;
1666                         }
1667                         return true;
1668                 }
1669
1670 #if !MOONLIGHT
1671                 public bool ConnectAsync (SocketAsyncEventArgs e)
1672                 {
1673                         // NO check is made whether e != null in MS.NET (NRE is thrown in such case)
1674                         if (disposed && closed)
1675                                 throw new ObjectDisposedException (GetType ().ToString ());
1676                         if (islistening)
1677                                 throw new InvalidOperationException ("You may not perform this operation after calling the Listen method.");
1678                         if (e.RemoteEndPoint == null)
1679                                 throw new ArgumentNullException ("remoteEP");
1680
1681                         return ConnectAsyncReal (e);
1682                 }
1683 #endif
1684 #if MOONLIGHT
1685                 static void CheckConnect (SocketAsyncEventArgs e)
1686                 {
1687                         // NO check is made whether e != null in MS.NET (NRE is thrown in such case)
1688
1689                         if (e.RemoteEndPoint == null)
1690                                 throw new ArgumentNullException ("remoteEP");
1691                         if (e.BufferList != null)
1692                                 throw new ArgumentException ("Multiple buffers cannot be used with this method.");
1693                 }
1694
1695                 public bool ConnectAsync (SocketAsyncEventArgs e)
1696                 {
1697                         if (disposed && closed)
1698                                 throw new ObjectDisposedException (GetType ().ToString ());
1699
1700                         CheckConnect (e);
1701                         // if an address family is specified then they must match
1702                         AddressFamily raf = e.RemoteEndPoint.AddressFamily;
1703                         if ((raf != AddressFamily.Unspecified) && (raf != AddressFamily))
1704                                 throw new NotSupportedException ("AddressFamily mismatch between socket and endpoint");
1705
1706                         return ConnectAsyncReal (e);
1707                 }
1708
1709                 public static bool ConnectAsync (SocketType socketType, ProtocolType protocolType, SocketAsyncEventArgs e)
1710                 {
1711                         // exception ordering requires to check before creating the socket (good thing resource wise too)
1712                         CheckConnect (e);
1713
1714                         // create socket based on the endpoint address family (if specified), otherwise default fo IPv4
1715                         AddressFamily raf = e.RemoteEndPoint.AddressFamily;
1716                         if (raf == AddressFamily.Unspecified)
1717                                 raf = AddressFamily.InterNetwork;
1718                         Socket s = new Socket (raf, socketType, protocolType);
1719                         return s.ConnectAsyncReal (e);
1720                 }
1721
1722                 public static void CancelConnectAsync (SocketAsyncEventArgs e)
1723                 {
1724                         if (e == null)
1725                                 throw new ArgumentNullException ("e");
1726
1727                         // FIXME: this is canceling a synchronous connect, not an async one
1728                         Socket s = e.ConnectSocket;
1729                         if ((s != null) && (s.blocking_thread != null))
1730                                 s.blocking_thread.Abort ();
1731                 }
1732 #endif
1733                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
1734                 private extern static int Receive_internal (IntPtr sock, WSABUF[] bufarray, SocketFlags flags, out int error);
1735 #if !MOONLIGHT
1736                 public
1737 #else
1738                 internal
1739 #endif
1740                 int Receive (IList<ArraySegment<byte>> buffers)
1741                 {
1742                         int ret;
1743                         SocketError error;
1744                         ret = Receive (buffers, SocketFlags.None, out error);
1745                         if (error != SocketError.Success) {
1746                                 throw new SocketException ((int)error);
1747                         }
1748                         return(ret);
1749                 }
1750
1751                 [CLSCompliant (false)]
1752 #if !MOONLIGHT
1753                 public
1754 #else
1755                 internal
1756 #endif
1757                 int Receive (IList<ArraySegment<byte>> buffers, SocketFlags socketFlags)
1758                 {
1759                         int ret;
1760                         SocketError error;
1761                         ret = Receive (buffers, socketFlags, out error);
1762                         if (error != SocketError.Success) {
1763                                 throw new SocketException ((int)error);
1764                         }
1765                         return(ret);
1766                 }
1767
1768                 [CLSCompliant (false)]
1769 #if !MOONLIGHT
1770                 public
1771 #else
1772                 internal
1773 #endif
1774                 int Receive (IList<ArraySegment<byte>> buffers, SocketFlags socketFlags, out SocketError errorCode)
1775                 {
1776                         if (disposed && closed)
1777                                 throw new ObjectDisposedException (GetType ().ToString ());
1778
1779                         if (buffers == null ||
1780                             buffers.Count == 0) {
1781                                 throw new ArgumentNullException ("buffers");
1782                         }
1783
1784                         int numsegments = buffers.Count;
1785                         int nativeError;
1786                         int ret;
1787
1788                         /* Only example I can find of sending a byte
1789                          * array reference directly into an internal
1790                          * call is in
1791                          * System.Runtime.Remoting/System.Runtime.Remoting.Channels.Ipc.Win32/NamedPipeSocket.cs,
1792                          * so taking a lead from that...
1793                          */
1794                         WSABUF[] bufarray = new WSABUF[numsegments];
1795                         GCHandle[] gch = new GCHandle[numsegments];
1796
1797                         for(int i = 0; i < numsegments; i++) {
1798                                 ArraySegment<byte> segment = buffers[i];
1799                                 gch[i] = GCHandle.Alloc (segment.Array, GCHandleType.Pinned);
1800                                 bufarray[i].len = segment.Count;
1801                                 bufarray[i].buf = Marshal.UnsafeAddrOfPinnedArrayElement (segment.Array, segment.Offset);
1802                         }
1803
1804                         try {
1805                                 ret = Receive_internal (socket, bufarray,
1806                                                         socketFlags,
1807                                                         out nativeError);
1808                         } finally {
1809                                 for(int i = 0; i < numsegments; i++) {
1810                                         if (gch[i].IsAllocated) {
1811                                                 gch[i].Free ();
1812                                         }
1813                                 }
1814                         }
1815
1816                         errorCode = (SocketError)nativeError;
1817                         return(ret);
1818                 }
1819
1820                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
1821                 private extern static int Send_internal (IntPtr sock, WSABUF[] bufarray, SocketFlags flags, out int error);
1822 #if !MOONLIGHT
1823                 public
1824 #else
1825                 internal
1826 #endif
1827                 int Send (IList<ArraySegment<byte>> buffers)
1828                 {
1829                         int ret;
1830                         SocketError error;
1831                         ret = Send (buffers, SocketFlags.None, out error);
1832                         if (error != SocketError.Success) {
1833                                 throw new SocketException ((int)error);
1834                         }
1835                         return(ret);
1836                 }
1837
1838 #if !MOONLIGHT
1839                 public
1840 #else
1841                 internal
1842 #endif
1843                 int Send (IList<ArraySegment<byte>> buffers, SocketFlags socketFlags)
1844                 {
1845                         int ret;
1846                         SocketError error;
1847                         ret = Send (buffers, socketFlags, out error);
1848                         if (error != SocketError.Success) {
1849                                 throw new SocketException ((int)error);
1850                         }
1851                         return(ret);
1852                 }
1853
1854                 [CLSCompliant (false)]
1855 #if !MOONLIGHT
1856                 public
1857 #else
1858                 internal
1859 #endif
1860                 int Send (IList<ArraySegment<byte>> buffers, SocketFlags socketFlags, out SocketError errorCode)
1861                 {
1862                         if (disposed && closed)
1863                                 throw new ObjectDisposedException (GetType ().ToString ());
1864                         if (buffers == null)
1865                                 throw new ArgumentNullException ("buffers");
1866                         if (buffers.Count == 0)
1867                                 throw new ArgumentException ("Buffer is empty", "buffers");
1868                         int numsegments = buffers.Count;
1869                         int nativeError;
1870                         int ret;
1871
1872                         WSABUF[] bufarray = new WSABUF[numsegments];
1873                         GCHandle[] gch = new GCHandle[numsegments];
1874                         for(int i = 0; i < numsegments; i++) {
1875                                 ArraySegment<byte> segment = buffers[i];
1876                                 gch[i] = GCHandle.Alloc (segment.Array, GCHandleType.Pinned);
1877                                 bufarray[i].len = segment.Count;
1878                                 bufarray[i].buf = Marshal.UnsafeAddrOfPinnedArrayElement (segment.Array, segment.Offset);
1879                         }
1880
1881                         try {
1882                                 ret = Send_internal (socket, bufarray, socketFlags, out nativeError);
1883                         } finally {
1884                                 for(int i = 0; i < numsegments; i++) {
1885                                         if (gch[i].IsAllocated) {
1886                                                 gch[i].Free ();
1887                                         }
1888                                 }
1889                         }
1890                         errorCode = (SocketError)nativeError;
1891                         return(ret);
1892                 }
1893
1894                 Exception InvalidAsyncOp (string method)
1895                 {
1896                         return new InvalidOperationException (method + " can only be called once per asynchronous operation");
1897                 }
1898
1899 #if !MOONLIGHT
1900                 public
1901 #else
1902                 internal
1903 #endif
1904                 int EndReceive (IAsyncResult result)
1905                 {
1906                         SocketError error;
1907                         int bytesReceived = EndReceive (result, out error);
1908                         if (error != SocketError.Success) {
1909                                 if (error != SocketError.WouldBlock && error != SocketError.InProgress)
1910                                         connected = false;
1911                                 throw new SocketException ((int)error);
1912                         }
1913                         return bytesReceived;
1914                 }
1915
1916 #if !MOONLIGHT
1917                 public
1918 #else
1919                 internal
1920 #endif
1921                 int EndReceive (IAsyncResult asyncResult, out SocketError errorCode)
1922                 {
1923                         if (disposed && closed)
1924                                 throw new ObjectDisposedException (GetType ().ToString ());
1925
1926                         if (asyncResult == null)
1927                                 throw new ArgumentNullException ("asyncResult");
1928
1929                         SocketAsyncResult req = asyncResult as SocketAsyncResult;
1930                         if (req == null)
1931                                 throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
1932
1933                         if (Interlocked.CompareExchange (ref req.EndCalled, 1, 0) == 1)
1934                                 throw InvalidAsyncOp ("EndReceive");
1935                         if (!asyncResult.IsCompleted)
1936                                 asyncResult.AsyncWaitHandle.WaitOne ();
1937
1938                         errorCode = req.ErrorCode;
1939                         // If no socket error occurred, call CheckIfThrowDelayedException in case there are other
1940                         // kinds of exceptions that should be thrown.
1941                         if (errorCode == SocketError.Success)
1942                                 req.CheckIfThrowDelayedException();
1943
1944                         return(req.Total);
1945                 }
1946
1947 #if !MOONLIGHT
1948                 public
1949 #else
1950                 internal
1951 #endif
1952                 int EndSend (IAsyncResult result)
1953                 {
1954                         SocketError error;
1955                         int bytesSent = EndSend (result, out error);
1956                         if (error != SocketError.Success) {
1957                                 if (error != SocketError.WouldBlock && error != SocketError.InProgress)
1958                                         connected = false;
1959                                 throw new SocketException ((int)error);
1960                         }
1961                         return bytesSent;
1962                 }
1963
1964 #if !MOONLIGHT
1965                 public
1966 #else
1967                 internal
1968 #endif
1969                 int EndSend (IAsyncResult asyncResult, out SocketError errorCode)
1970                 {
1971                         if (disposed && closed)
1972                                 throw new ObjectDisposedException (GetType ().ToString ());
1973                         if (asyncResult == null)
1974                                 throw new ArgumentNullException ("asyncResult");
1975
1976                         SocketAsyncResult req = asyncResult as SocketAsyncResult;
1977                         if (req == null)
1978                                 throw new ArgumentException ("Invalid IAsyncResult", "result");
1979
1980                         if (Interlocked.CompareExchange (ref req.EndCalled, 1, 0) == 1)
1981                                 throw InvalidAsyncOp ("EndSend");
1982                         if (!asyncResult.IsCompleted)
1983                                 asyncResult.AsyncWaitHandle.WaitOne ();
1984
1985                         errorCode = req.ErrorCode;
1986                         // If no socket error occurred, call CheckIfThrowDelayedException in case there are other
1987                         // kinds of exceptions that should be thrown.
1988                         if (errorCode == SocketError.Success)
1989                                 req.CheckIfThrowDelayedException ();
1990
1991                         return(req.Total);
1992                 }
1993
1994                 // Used by Udpclient
1995 #if !MOONLIGHT
1996                 public
1997 #else
1998                 internal
1999 #endif
2000                 int EndReceiveFrom(IAsyncResult result, ref EndPoint end_point)
2001                 {
2002                         if (disposed && closed)
2003                                 throw new ObjectDisposedException (GetType ().ToString ());
2004
2005                         if (result == null)
2006                                 throw new ArgumentNullException ("result");
2007
2008                         if (end_point == null)
2009                                 throw new ArgumentNullException ("remote_end");
2010
2011                         SocketAsyncResult req = result as SocketAsyncResult;
2012                         if (req == null)
2013                                 throw new ArgumentException ("Invalid IAsyncResult", "result");
2014
2015                         if (Interlocked.CompareExchange (ref req.EndCalled, 1, 0) == 1)
2016                                 throw InvalidAsyncOp ("EndReceiveFrom");
2017                         if (!result.IsCompleted)
2018                                 result.AsyncWaitHandle.WaitOne();
2019
2020                         req.CheckIfThrowDelayedException();
2021                         end_point = req.EndPoint;
2022                         return req.Total;
2023                 }
2024
2025                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
2026                 static extern void socket_pool_queue (SocketAsyncCall d, SocketAsyncResult r);
2027         }
2028 }
2029