reactos/ntoskrnl/lpc/send.c

   1 /*
   2  * PROJECT:         ReactOS Kernel
   3  * LICENSE:         GPL - See COPYING in the top level directory
   4  * FILE:            ntoskrnl/lpc/send.c
   5  * PURPOSE:         Local Procedure Call: Sending (Requests)
   6  * PROGRAMMERS:     Alex Ionescu (alex.ionescu@reactos.org)
   7  */
   8
   9 /* INCLUDES ******************************************************************/
  10
  11 #include <ntoskrnl.h>
  12 #define NDEBUG
  13 #include <debug.h>
  14
  15 /* PUBLIC FUNCTIONS **********************************************************/
  16
  17 /*
  18  * @implemented
  19  */
  20 NTSTATUS
  21 NTAPI
  22 LpcRequestPort(IN PVOID PortObject,
  23                IN PPORT_MESSAGE LpcMessage)
  24 {
  25     PLPCP_PORT_OBJECT Port = PortObject, QueuePort, ConnectionPort = NULL;
  26     ULONG MessageType;
  27     PLPCP_MESSAGE Message;
  28     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
  29     PAGED_CODE();
  30     LPCTRACE(LPC_SEND_DEBUG, "Port: %p. Message: %p\n", Port, LpcMessage);
  31
  32     /* Check if this is a non-datagram message */
  33     if (LpcMessage->u2.s2.Type)
  34     {
  35         /* Get the message type */
  36         MessageType = LpcpGetMessageType(LpcMessage);
  37
  38         /* Validate it */
  39         if ((MessageType < LPC_DATAGRAM) || (MessageType > LPC_CLIENT_DIED))
  40         {
  41             /* Fail */
  42             return STATUS_INVALID_PARAMETER;
  43         }
  44
  45         /* Mark this as a kernel-mode message only if we really came from it */
  46         if ((PreviousMode == KernelMode) &&
  47             (LpcMessage->u2.s2.Type & LPC_KERNELMODE_MESSAGE))
  48         {
  49             /* We did, this is a kernel mode message */
  50             MessageType |= LPC_KERNELMODE_MESSAGE;
  51         }
  52     }
  53     else
  54     {
  55         /* This is a datagram */
  56         MessageType = LPC_DATAGRAM;
  57     }
  58
  59     /* Can't have data information on this type of call */
  60     if (LpcMessage->u2.s2.DataInfoOffset) return STATUS_INVALID_PARAMETER;
  61
  62     /* Validate message sizes */
  63     if (((ULONG)LpcMessage->u1.s1.TotalLength > Port->MaxMessageLength) ||
  64         ((ULONG)LpcMessage->u1.s1.TotalLength <= (ULONG)LpcMessage->u1.s1.DataLength))
  65     {
  66         /* Fail */
  67         return STATUS_PORT_MESSAGE_TOO_LONG;
  68     }
  69
  70     /* Allocate a new message */
  71     Message = LpcpAllocateFromPortZone();
  72     if (!Message) return STATUS_NO_MEMORY;
  73
  74     /* Clear the context */
  75     Message->RepliedToThread = NULL;
  76     Message->PortContext = NULL;
  77
  78     /* Copy the message */
  79     LpcpMoveMessage(&Message->Request,
  80                     LpcMessage,
  81                     LpcMessage + 1,
  82                     MessageType,
  83                     &PsGetCurrentThread()->Cid);
  84
  85     /* Acquire the LPC lock */
  86     KeAcquireGuardedMutex(&LpcpLock);
  87
  88     /* Check if this is anything but a connection port */
  89     if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_CONNECTION_PORT)
  90     {
  91         /* The queue port is the connected port */
  92         QueuePort = Port->ConnectedPort;
  93         if (QueuePort)
  94         {
  95             /* Check if this is a client port */
  96             if ((Port->Flags & LPCP_PORT_TYPE_MASK) == LPCP_CLIENT_PORT)
  97             {
  98                 /* Then copy the context */
  99                 Message->PortContext = QueuePort->PortContext;
 100                 ConnectionPort = QueuePort = Port->ConnectionPort;
 101                 if (!ConnectionPort)
 102                 {
 103                     /* Fail */
 104                     LpcpFreeToPortZone(Message, 3);
 105                     return STATUS_PORT_DISCONNECTED;
 106                 }
 107             }
 108             else if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_COMMUNICATION_PORT)
 109             {
 110                 /* Any other kind of port, use the connection port */
 111                 ConnectionPort = QueuePort = Port->ConnectionPort;
 112                 if (!ConnectionPort)
 113                 {
 114                     /* Fail */
 115                     LpcpFreeToPortZone(Message, 3);
 116                     return STATUS_PORT_DISCONNECTED;
 117                 }
 118             }
 119
 120             /* If we have a connection port, reference it */
 121             if (ConnectionPort) ObReferenceObject(ConnectionPort);
 122         }
 123     }
 124     else
 125     {
 126         /* For connection ports, use the port itself */
 127         QueuePort = PortObject;
 128     }
 129
 130     /* Make sure we have a port */
 131     if (QueuePort)
 132     {
 133         /* Generate the Message ID and set it */
 134         Message->Request.MessageId =  LpcpNextMessageId++;
 135         if (!LpcpNextMessageId) LpcpNextMessageId = 1;
 136         Message->Request.CallbackId = 0;
 137
 138         /* No Message ID for the thread */
 139         PsGetCurrentThread()->LpcReplyMessageId = 0;
 140
 141         /* Insert the message in our chain */
 142         InsertTailList(&QueuePort->MsgQueue.ReceiveHead, &Message->Entry);
 143
 144         /* Release the lock and release the semaphore */
 145         KeEnterCriticalRegion();
 146         KeReleaseGuardedMutex(&LpcpLock);
 147         LpcpCompleteWait(QueuePort->MsgQueue.Semaphore);
 148
 149         /* If this is a waitable port, wake it up */
 150         if (QueuePort->Flags & LPCP_WAITABLE_PORT)
 151         {
 152             /* Wake it */
 153             KeSetEvent(&QueuePort->WaitEvent, IO_NO_INCREMENT, FALSE);
 154         }
 155
 156         /* We're done */
 157         KeLeaveCriticalRegion();
 158         if (ConnectionPort) ObDereferenceObject(ConnectionPort);
 159         LPCTRACE(LPC_SEND_DEBUG, "Port: %p. Message: %p\n", QueuePort, Message);
 160         return STATUS_SUCCESS;
 161     }
 162
 163     /* If we got here, then free the message and fail */
 164     LpcpFreeToPortZone(Message, 3);
 165     if (ConnectionPort) ObDereferenceObject(ConnectionPort);
 166     return STATUS_PORT_DISCONNECTED;
 167 }
 168
 169 /*
 170 * @implemented
 171 */
 172 NTSTATUS
 173 NTAPI
 174 LpcRequestWaitReplyPort(IN PVOID PortObject,
 175                         IN PPORT_MESSAGE LpcRequest,
 176                         OUT PPORT_MESSAGE LpcReply)
 177 {
 178     PLPCP_PORT_OBJECT Port, QueuePort, ReplyPort, ConnectionPort = NULL;
 179     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
 180     NTSTATUS Status = STATUS_SUCCESS;
 181     PLPCP_MESSAGE Message;
 182     PETHREAD Thread = PsGetCurrentThread();
 183     BOOLEAN Callback = FALSE;
 184     PKSEMAPHORE Semaphore;
 185     ULONG MessageType;
 186     PAGED_CODE();
 187
 188     Port = (PLPCP_PORT_OBJECT)PortObject;
 189
 190     LPCTRACE(LPC_SEND_DEBUG,
 191              "Port: %p. Messages: %p/%p. Type: %lx\n",
 192              Port,
 193              LpcRequest,
 194              LpcReply,
 195              LpcpGetMessageType(LpcRequest));
 196
 197     /* Check if the thread is dying */
 198     if (Thread->LpcExitThreadCalled) return STATUS_THREAD_IS_TERMINATING;
 199
 200     /* Check if this is an LPC Request */
 201     MessageType = LpcpGetMessageType(LpcRequest);
 202     switch (MessageType)
 203     {
 204         /* No type */
 205         case 0:
 206
 207             /* Assume LPC request */
 208             MessageType = LPC_REQUEST;
 209             break;
 210
 211         /* LPC request callback */
 212         case LPC_REQUEST:
 213
 214             /* This is a callback */
 215             Callback = TRUE;
 216             break;
 217
 218         /* Anything else */
 219         case LPC_CLIENT_DIED:
 220         case LPC_PORT_CLOSED:
 221         case LPC_EXCEPTION:
 222         case LPC_DEBUG_EVENT:
 223         case LPC_ERROR_EVENT:
 224
 225             /* Nothing to do */
 226             break;
 227
 228         default:
 229
 230             /* Invalid message type */
 231             return STATUS_INVALID_PARAMETER;
 232     }
 233
 234     /* Set the request type */
 235     LpcRequest->u2.s2.Type = MessageType;
 236
 237     /* Validate the message length */
 238     if (((ULONG)LpcRequest->u1.s1.TotalLength > Port->MaxMessageLength) ||
 239         ((ULONG)LpcRequest->u1.s1.TotalLength <= (ULONG)LpcRequest->u1.s1.DataLength))
 240     {
 241         /* Fail */
 242         return STATUS_PORT_MESSAGE_TOO_LONG;
 243     }
 244
 245     /* Allocate a message from the port zone */
 246     Message = LpcpAllocateFromPortZone();
 247     if (!Message)
 248     {
 249         /* Fail if we couldn't allocate a message */
 250         return STATUS_NO_MEMORY;
 251     }
 252
 253     /* Check if this is a callback */
 254     if (Callback)
 255     {
 256         /* FIXME: TODO */
 257         Semaphore = NULL; // we'd use the Thread Semaphore here
 258         ASSERT(FALSE);
 259         return STATUS_NOT_IMPLEMENTED;
 260     }
 261     else
 262     {
 263         /* No callback, just copy the message */
 264         LpcpMoveMessage(&Message->Request,
 265                         LpcRequest,
 266                         LpcRequest + 1,
 267                         0,
 268                         &Thread->Cid);
 269
 270         /* Acquire the LPC lock */
 271         KeAcquireGuardedMutex(&LpcpLock);
 272
 273         /* Right now clear the port context */
 274         Message->PortContext = NULL;
 275
 276         /* Check if this is a not connection port */
 277         if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_CONNECTION_PORT)
 278         {
 279             /* We want the connected port */
 280             QueuePort = Port->ConnectedPort;
 281             if (!QueuePort)
 282             {
 283                 /* We have no connected port, fail */
 284                 LpcpFreeToPortZone(Message, 3);
 285                 return STATUS_PORT_DISCONNECTED;
 286             }
 287
 288             /* This will be the rundown port */
 289             ReplyPort = QueuePort;
 290
 291             /* Check if this is a communication port */
 292             if ((Port->Flags & LPCP_PORT_TYPE_MASK) == LPCP_CLIENT_PORT)
 293             {
 294                 /* Copy the port context and use the connection port */
 295                 Message->PortContext = QueuePort->PortContext;
 296                 ConnectionPort = QueuePort = Port->ConnectionPort;
 297                 if (!ConnectionPort)
 298                 {
 299                     /* Fail */
 300                     LpcpFreeToPortZone(Message, 3);
 301                     return STATUS_PORT_DISCONNECTED;
 302                 }
 303             }
 304             else if ((Port->Flags & LPCP_PORT_TYPE_MASK) !=
 305                       LPCP_COMMUNICATION_PORT)
 306             {
 307                 /* Use the connection port for anything but communication ports */
 308                 ConnectionPort = QueuePort = Port->ConnectionPort;
 309                 if (!ConnectionPort)
 310                 {
 311                     /* Fail */
 312                     LpcpFreeToPortZone(Message, 3);
 313                     return STATUS_PORT_DISCONNECTED;
 314                 }
 315             }
 316
 317             /* Reference the connection port if it exists */
 318             if (ConnectionPort) ObReferenceObject(ConnectionPort);
 319         }
 320         else
 321         {
 322             /* Otherwise, for a connection port, use the same port object */
 323             QueuePort = ReplyPort = Port;
 324         }
 325
 326         /* No reply thread */
 327         Message->RepliedToThread = NULL;
 328         Message->SenderPort = Port;
 329
 330         /* Generate the Message ID and set it */
 331         Message->Request.MessageId =  LpcpNextMessageId++;
 332         if (!LpcpNextMessageId) LpcpNextMessageId = 1;
 333         Message->Request.CallbackId = 0;
 334
 335         /* Set the message ID for our thread now */
 336         Thread->LpcReplyMessageId = Message->Request.MessageId;
 337         Thread->LpcReplyMessage = NULL;
 338
 339         /* Insert the message in our chain */
 340         InsertTailList(&QueuePort->MsgQueue.ReceiveHead, &Message->Entry);
 341         InsertTailList(&ReplyPort->LpcReplyChainHead, &Thread->LpcReplyChain);
 342         LpcpSetPortToThread(Thread, Port);
 343
 344         /* Release the lock and get the semaphore we'll use later */
 345         KeEnterCriticalRegion();
 346         KeReleaseGuardedMutex(&LpcpLock);
 347         Semaphore = QueuePort->MsgQueue.Semaphore;
 348
 349         /* If this is a waitable port, wake it up */
 350         if (QueuePort->Flags & LPCP_WAITABLE_PORT)
 351         {
 352             /* Wake it */
 353             KeSetEvent(&QueuePort->WaitEvent, IO_NO_INCREMENT, FALSE);
 354         }
 355     }
 356
 357     /* Now release the semaphore */
 358     LpcpCompleteWait(Semaphore);
 359     KeLeaveCriticalRegion();
 360
 361     /* And let's wait for the reply */
 362     LpcpReplyWait(&Thread->LpcReplySemaphore, PreviousMode);
 363
 364     /* Acquire the LPC lock */
 365     KeAcquireGuardedMutex(&LpcpLock);
 366
 367     /* Get the LPC Message and clear our thread's reply data */
 368     Message = LpcpGetMessageFromThread(Thread);
 369     Thread->LpcReplyMessage = NULL;
 370     Thread->LpcReplyMessageId = 0;
 371
 372     /* Check if we have anything on the reply chain*/
 373     if (!IsListEmpty(&Thread->LpcReplyChain))
 374     {
 375         /* Remove this thread and reinitialize the list */
 376         RemoveEntryList(&Thread->LpcReplyChain);
 377         InitializeListHead(&Thread->LpcReplyChain);
 378     }
 379
 380     /* Release the lock */
 381     KeReleaseGuardedMutex(&LpcpLock);
 382
 383     /* Check if we got a reply */
 384     if (Status == STATUS_SUCCESS)
 385     {
 386         /* Check if we have a valid message */
 387         if (Message)
 388         {
 389             LPCTRACE(LPC_SEND_DEBUG,
 390                      "Reply Messages: %p/%p\n",
 391                      &Message->Request,
 392                      (&Message->Request) + 1);
 393
 394             /* Move the message */
 395             LpcpMoveMessage(LpcReply,
 396                             &Message->Request,
 397                             (&Message->Request) + 1,
 398                             0,
 399                             NULL);
 400
 401             /* Acquire the lock */
 402             KeAcquireGuardedMutex(&LpcpLock);
 403
 404             /* Check if we replied to a thread */
 405             if (Message->RepliedToThread)
 406             {
 407                 /* Dereference */
 408                 ObDereferenceObject(Message->RepliedToThread);
 409                 Message->RepliedToThread = NULL;
 410             }
 411
 412
 413             /* Free the message */
 414             LpcpFreeToPortZone(Message, 3);
 415         }
 416         else
 417         {
 418             /* We don't have a reply */
 419             Status = STATUS_LPC_REPLY_LOST;
 420         }
 421     }
 422     else
 423     {
 424         /* The wait failed, free the message */
 425         if (Message) LpcpFreeToPortZone(Message, 0);
 426     }
 427
 428     /* All done */
 429     LPCTRACE(LPC_SEND_DEBUG,
 430              "Port: %p. Status: %p\n",
 431              Port,
 432              Status);
 433
 434     /* Dereference the connection port */
 435     if (ConnectionPort) ObDereferenceObject(ConnectionPort);
 436     return Status;
 437 }
 438
 439 /*
 440  * @unimplemented
 441  */
 442 NTSTATUS
 443 NTAPI
 444 NtRequestPort(IN HANDLE PortHandle,
 445               IN PPORT_MESSAGE LpcMessage)
 446 {
 447     UNIMPLEMENTED;
 448     return STATUS_NOT_IMPLEMENTED;
 449 }
 450
 451 /*
 452  * @implemented
 453  */
 454 NTSTATUS
 455 NTAPI
 456 NtRequestWaitReplyPort(IN HANDLE PortHandle,
 457                        IN PPORT_MESSAGE LpcRequest,
 458                        IN OUT PPORT_MESSAGE LpcReply)
 459 {
 460     PLPCP_PORT_OBJECT Port, QueuePort, ReplyPort, ConnectionPort = NULL;
 461     KPROCESSOR_MODE PreviousMode = KeGetPreviousMode();
 462     NTSTATUS Status;
 463     PLPCP_MESSAGE Message;
 464     PETHREAD Thread = PsGetCurrentThread();
 465     BOOLEAN Callback;
 466     PKSEMAPHORE Semaphore;
 467     ULONG MessageType;
 468     PAGED_CODE();
 469     LPCTRACE(LPC_SEND_DEBUG,
 470              "Handle: %lx. Messages: %p/%p. Type: %lx\n",
 471              PortHandle,
 472              LpcRequest,
 473              LpcReply,
 474              LpcpGetMessageType(LpcRequest));
 475
 476     /* Check if the thread is dying */
 477     if (Thread->LpcExitThreadCalled) return STATUS_THREAD_IS_TERMINATING;
 478
 479     /* Check if this is an LPC Request */
 480     if (LpcpGetMessageType(LpcRequest) == LPC_REQUEST)
 481     {
 482         /* Then it's a callback */
 483         Callback = TRUE;
 484     }
 485     else if (LpcpGetMessageType(LpcRequest))
 486     {
 487         /* This is a not kernel-mode message */
 488         return STATUS_INVALID_PARAMETER;
 489     }
 490     else
 491     {
 492         /* This is a kernel-mode message without a callback */
 493         LpcRequest->u2.s2.Type |= LPC_REQUEST;
 494         Callback = FALSE;
 495     }
 496
 497     /* Get the message type */
 498     MessageType = LpcRequest->u2.s2.Type;
 499
 500     /* Validate the length */
 501     if (((ULONG)LpcRequest->u1.s1.DataLength + sizeof(PORT_MESSAGE)) >
 502          (ULONG)LpcRequest->u1.s1.TotalLength)
 503     {
 504         /* Fail */
 505         return STATUS_INVALID_PARAMETER;
 506     }
 507
 508     /* Reference the object */
 509     Status = ObReferenceObjectByHandle(PortHandle,
 510                                        0,
 511                                        LpcPortObjectType,
 512                                        PreviousMode,
 513                                        (PVOID*)&Port,
 514                                        NULL);
 515     if (!NT_SUCCESS(Status)) return Status;
 516
 517     /* Validate the message length */
 518     if (((ULONG)LpcRequest->u1.s1.TotalLength > Port->MaxMessageLength) ||
 519         ((ULONG)LpcRequest->u1.s1.TotalLength <= (ULONG)LpcRequest->u1.s1.DataLength))
 520     {
 521         /* Fail */
 522         ObDereferenceObject(Port);
 523         return STATUS_PORT_MESSAGE_TOO_LONG;
 524     }
 525
 526     /* Allocate a message from the port zone */
 527     Message = LpcpAllocateFromPortZone();
 528     if (!Message)
 529     {
 530         /* Fail if we couldn't allocate a message */
 531         ObDereferenceObject(Port);
 532         return STATUS_NO_MEMORY;
 533     }
 534
 535     /* Check if this is a callback */
 536     if (Callback)
 537     {
 538         /* FIXME: TODO */
 539         Semaphore = NULL; // we'd use the Thread Semaphore here
 540         ASSERT(FALSE);
 541     }
 542     else
 543     {
 544         /* No callback, just copy the message */
 545         _SEH2_TRY
 546         {
 547             /* Copy it */
 548             LpcpMoveMessage(&Message->Request,
 549                             LpcRequest,
 550                             LpcRequest + 1,
 551                             MessageType,
 552                             &Thread->Cid);
 553         }
 554         _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 555         {
 556             /* Fail */
 557             LpcpFreeToPortZone(Message, 0);
 558             ObDereferenceObject(Port);
 559             _SEH2_YIELD(return _SEH2_GetExceptionCode());
 560         }
 561         _SEH2_END;
 562
 563         /* Acquire the LPC lock */
 564         KeAcquireGuardedMutex(&LpcpLock);
 565
 566         /* Right now clear the port context */
 567         Message->PortContext = NULL;
 568
 569         /* Check if this is a not connection port */
 570         if ((Port->Flags & LPCP_PORT_TYPE_MASK) != LPCP_CONNECTION_PORT)
 571         {
 572             /* We want the connected port */
 573             QueuePort = Port->ConnectedPort;
 574             if (!QueuePort)
 575             {
 576                 /* We have no connected port, fail */
 577                 LpcpFreeToPortZone(Message, 3);
 578                 ObDereferenceObject(Port);
 579                 return STATUS_PORT_DISCONNECTED;
 580             }
 581
 582             /* This will be the rundown port */
 583             ReplyPort = QueuePort;
 584
 585             /* Check if this is a communication port */
 586             if ((Port->Flags & LPCP_PORT_TYPE_MASK) == LPCP_CLIENT_PORT)
 587             {
 588                 /* Copy the port context and use the connection port */
 589                 Message->PortContext = QueuePort->PortContext;
 590                 ConnectionPort = QueuePort = Port->ConnectionPort;
 591                 if (!ConnectionPort)
 592                 {
 593                     /* Fail */
 594                     LpcpFreeToPortZone(Message, 3);
 595                     ObDereferenceObject(Port);
 596                     return STATUS_PORT_DISCONNECTED;
 597                 }
 598             }
 599             else if ((Port->Flags & LPCP_PORT_TYPE_MASK) !=
 600                       LPCP_COMMUNICATION_PORT)
 601             {
 602                 /* Use the connection port for anything but communication ports */
 603                 ConnectionPort = QueuePort = Port->ConnectionPort;
 604                 if (!ConnectionPort)
 605                 {
 606                     /* Fail */
 607                     LpcpFreeToPortZone(Message, 3);
 608                     ObDereferenceObject(Port);
 609                     return STATUS_PORT_DISCONNECTED;
 610                 }
 611             }
 612
 613             /* Reference the connection port if it exists */
 614             if (ConnectionPort) ObReferenceObject(ConnectionPort);
 615         }
 616         else
 617         {
 618             /* Otherwise, for a connection port, use the same port object */
 619             QueuePort = ReplyPort = Port;
 620         }
 621
 622         /* No reply thread */
 623         Message->RepliedToThread = NULL;
 624         Message->SenderPort = Port;
 625
 626         /* Generate the Message ID and set it */
 627         Message->Request.MessageId =  LpcpNextMessageId++;
 628         if (!LpcpNextMessageId) LpcpNextMessageId = 1;
 629         Message->Request.CallbackId = 0;
 630
 631         /* Set the message ID for our thread now */
 632         Thread->LpcReplyMessageId = Message->Request.MessageId;
 633         Thread->LpcReplyMessage = NULL;
 634
 635         /* Insert the message in our chain */
 636         InsertTailList(&QueuePort->MsgQueue.ReceiveHead, &Message->Entry);
 637         InsertTailList(&ReplyPort->LpcReplyChainHead, &Thread->LpcReplyChain);
 638         LpcpSetPortToThread(Thread, Port);
 639
 640         /* Release the lock and get the semaphore we'll use later */
 641         KeEnterCriticalRegion();
 642         KeReleaseGuardedMutex(&LpcpLock);
 643         Semaphore = QueuePort->MsgQueue.Semaphore;
 644
 645         /* If this is a waitable port, wake it up */
 646         if (QueuePort->Flags & LPCP_WAITABLE_PORT)
 647         {
 648             /* Wake it */
 649             KeSetEvent(&QueuePort->WaitEvent, IO_NO_INCREMENT, FALSE);
 650         }
 651     }
 652
 653     /* Now release the semaphore */
 654     LpcpCompleteWait(Semaphore);
 655     KeLeaveCriticalRegion();
 656
 657     /* And let's wait for the reply */
 658     LpcpReplyWait(&Thread->LpcReplySemaphore, PreviousMode);
 659
 660     /* Acquire the LPC lock */
 661     KeAcquireGuardedMutex(&LpcpLock);
 662
 663     /* Get the LPC Message and clear our thread's reply data */
 664     Message = LpcpGetMessageFromThread(Thread);
 665     Thread->LpcReplyMessage = NULL;
 666     Thread->LpcReplyMessageId = 0;
 667
 668     /* Check if we have anything on the reply chain*/
 669     if (!IsListEmpty(&Thread->LpcReplyChain))
 670     {
 671         /* Remove this thread and reinitialize the list */
 672         RemoveEntryList(&Thread->LpcReplyChain);
 673         InitializeListHead(&Thread->LpcReplyChain);
 674     }
 675
 676     /* Release the lock */
 677     KeReleaseGuardedMutex(&LpcpLock);
 678
 679     /* Check if we got a reply */
 680     if (Status == STATUS_SUCCESS)
 681     {
 682         /* Check if we have a valid message */
 683         if (Message)
 684         {
 685             LPCTRACE(LPC_SEND_DEBUG,
 686                      "Reply Messages: %p/%p\n",
 687                      &Message->Request,
 688                      (&Message->Request) + 1);
 689
 690             /* Move the message */
 691             _SEH2_TRY
 692             {
 693                 LpcpMoveMessage(LpcReply,
 694                                 &Message->Request,
 695                                 (&Message->Request) + 1,
 696                                 0,
 697                                 NULL);
 698             }
 699             _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
 700             {
 701                 Status = _SEH2_GetExceptionCode();
 702             }
 703             _SEH2_END;
 704
 705             /* Check if this is an LPC request with data information */
 706             if ((LpcpGetMessageType(&Message->Request) == LPC_REQUEST) &&
 707                 (Message->Request.u2.s2.DataInfoOffset))
 708             {
 709                 /* Save the data information */
 710                 LpcpSaveDataInfoMessage(Port, Message, 0);
 711             }
 712             else
 713             {
 714                 /* Otherwise, just free it */
 715                 LpcpFreeToPortZone(Message, 0);
 716             }
 717         }
 718         else
 719         {
 720             /* We don't have a reply */
 721             Status = STATUS_LPC_REPLY_LOST;
 722         }
 723     }
 724     else
 725     {
 726         /* The wait failed, free the message */
 727         if (Message) LpcpFreeToPortZone(Message, 0);
 728     }
 729
 730     /* All done */
 731     LPCTRACE(LPC_SEND_DEBUG,
 732              "Port: %p. Status: %p\n",
 733              Port,
 734              Status);
 735     ObDereferenceObject(Port);
 736     if (ConnectionPort) ObDereferenceObject(ConnectionPort);
 737     return Status;
 738 }
 739
 740 /* EOF */