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)
9 /* INCLUDES ******************************************************************/
15 /* PUBLIC FUNCTIONS **********************************************************/
22 LpcRequestPort(IN PVOID PortObject
,
23 IN PPORT_MESSAGE LpcMessage
)
25 PLPCP_PORT_OBJECT Port
= PortObject
, QueuePort
, ConnectionPort
= NULL
;
27 PLPCP_MESSAGE Message
;
28 KPROCESSOR_MODE PreviousMode
= KeGetPreviousMode();
29 PETHREAD Thread
= PsGetCurrentThread();
33 LPCTRACE(LPC_SEND_DEBUG
, "Port: %p. Message: %p\n", Port
, LpcMessage
);
35 /* Check if this is a non-datagram message */
36 if (LpcMessage
->u2
.s2
.Type
)
38 /* Get the message type */
39 MessageType
= LpcpGetMessageType(LpcMessage
);
42 if ((MessageType
< LPC_DATAGRAM
) || (MessageType
> LPC_CLIENT_DIED
))
45 return STATUS_INVALID_PARAMETER
;
48 /* Mark this as a kernel-mode message only if we really came from it */
49 if ((PreviousMode
== KernelMode
) &&
50 (LpcMessage
->u2
.s2
.Type
& LPC_KERNELMODE_MESSAGE
))
52 /* We did, this is a kernel mode message */
53 MessageType
|= LPC_KERNELMODE_MESSAGE
;
58 /* This is a datagram */
59 MessageType
= LPC_DATAGRAM
;
62 /* Can't have data information on this type of call */
63 if (LpcMessage
->u2
.s2
.DataInfoOffset
) return STATUS_INVALID_PARAMETER
;
65 /* Validate the message length */
66 if (((ULONG
)LpcMessage
->u1
.s1
.TotalLength
> Port
->MaxMessageLength
) ||
67 ((ULONG
)LpcMessage
->u1
.s1
.TotalLength
<= (ULONG
)LpcMessage
->u1
.s1
.DataLength
))
70 return STATUS_PORT_MESSAGE_TOO_LONG
;
73 /* Allocate a new message */
74 Message
= LpcpAllocateFromPortZone();
75 if (!Message
) return STATUS_NO_MEMORY
;
77 /* Clear the context */
78 Message
->RepliedToThread
= NULL
;
79 Message
->PortContext
= NULL
;
81 /* Copy the message */
82 LpcpMoveMessage(&Message
->Request
,
88 /* Acquire the LPC lock */
89 KeAcquireGuardedMutex(&LpcpLock
);
91 /* Check if this is anything but a connection port */
92 if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) != LPCP_CONNECTION_PORT
)
94 /* The queue port is the connected port */
95 QueuePort
= Port
->ConnectedPort
;
98 /* Check if this is a client port */
99 if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) == LPCP_CLIENT_PORT
)
101 /* Then copy the context */
102 Message
->PortContext
= QueuePort
->PortContext
;
103 ConnectionPort
= QueuePort
= Port
->ConnectionPort
;
107 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
108 return STATUS_PORT_DISCONNECTED
;
111 else if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) != LPCP_COMMUNICATION_PORT
)
113 /* Any other kind of port, use the connection port */
114 ConnectionPort
= QueuePort
= Port
->ConnectionPort
;
118 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
119 return STATUS_PORT_DISCONNECTED
;
123 /* If we have a connection port, reference it */
124 if (ConnectionPort
) ObReferenceObject(ConnectionPort
);
129 /* For connection ports, use the port itself */
130 QueuePort
= PortObject
;
133 /* Make sure we have a port */
136 /* Generate the Message ID and set it */
137 Message
->Request
.MessageId
= LpcpNextMessageId
++;
138 if (!LpcpNextMessageId
) LpcpNextMessageId
= 1;
139 Message
->Request
.CallbackId
= 0;
141 /* No Message ID for the thread */
142 Thread
->LpcReplyMessageId
= 0;
144 /* Insert the message in our chain */
145 InsertTailList(&QueuePort
->MsgQueue
.ReceiveHead
, &Message
->Entry
);
147 /* Release the lock and the semaphore */
148 KeEnterCriticalRegion();
149 KeReleaseGuardedMutex(&LpcpLock
);
150 LpcpCompleteWait(QueuePort
->MsgQueue
.Semaphore
);
152 /* If this is a waitable port, wake it up */
153 if (QueuePort
->Flags
& LPCP_WAITABLE_PORT
)
156 KeSetEvent(&QueuePort
->WaitEvent
, IO_NO_INCREMENT
, FALSE
);
159 KeLeaveCriticalRegion();
162 if (ConnectionPort
) ObDereferenceObject(ConnectionPort
);
163 LPCTRACE(LPC_SEND_DEBUG
, "Port: %p. Message: %p\n", QueuePort
, Message
);
164 return STATUS_SUCCESS
;
167 /* If we got here, then free the message and fail */
168 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
169 if (ConnectionPort
) ObDereferenceObject(ConnectionPort
);
170 return STATUS_PORT_DISCONNECTED
;
178 LpcRequestWaitReplyPort(IN PVOID PortObject
,
179 IN PPORT_MESSAGE LpcRequest
,
180 OUT PPORT_MESSAGE LpcReply
)
182 PLPCP_PORT_OBJECT Port
, QueuePort
, ReplyPort
, ConnectionPort
= NULL
;
183 KPROCESSOR_MODE PreviousMode
= KeGetPreviousMode();
184 NTSTATUS Status
= STATUS_SUCCESS
;
185 PLPCP_MESSAGE Message
;
186 PETHREAD Thread
= PsGetCurrentThread();
187 BOOLEAN Callback
= FALSE
;
188 PKSEMAPHORE Semaphore
;
192 Port
= (PLPCP_PORT_OBJECT
)PortObject
;
194 LPCTRACE(LPC_SEND_DEBUG
,
195 "Port: %p. Messages: %p/%p. Type: %lx\n",
199 LpcpGetMessageType(LpcRequest
));
201 /* Check if the thread is dying */
202 if (Thread
->LpcExitThreadCalled
) return STATUS_THREAD_IS_TERMINATING
;
204 /* Check if this is an LPC Request */
205 MessageType
= LpcpGetMessageType(LpcRequest
);
211 /* Assume LPC request */
212 MessageType
= LPC_REQUEST
;
215 /* LPC request callback */
218 /* This is a callback */
223 case LPC_CLIENT_DIED
:
224 case LPC_PORT_CLOSED
:
226 case LPC_DEBUG_EVENT
:
227 case LPC_ERROR_EVENT
:
234 /* Invalid message type */
235 return STATUS_INVALID_PARAMETER
;
238 /* Set the request type */
239 LpcRequest
->u2
.s2
.Type
= MessageType
;
241 /* Validate the message length */
242 if (((ULONG
)LpcRequest
->u1
.s1
.TotalLength
> Port
->MaxMessageLength
) ||
243 ((ULONG
)LpcRequest
->u1
.s1
.TotalLength
<= (ULONG
)LpcRequest
->u1
.s1
.DataLength
))
246 return STATUS_PORT_MESSAGE_TOO_LONG
;
249 /* Allocate a message from the port zone */
250 Message
= LpcpAllocateFromPortZone();
253 /* Fail if we couldn't allocate a message */
254 return STATUS_NO_MEMORY
;
257 /* Check if this is a callback */
261 Semaphore
= NULL
; // we'd use the Thread Semaphore here
263 return STATUS_NOT_IMPLEMENTED
;
267 /* No callback, just copy the message */
268 LpcpMoveMessage(&Message
->Request
,
274 /* Acquire the LPC lock */
275 KeAcquireGuardedMutex(&LpcpLock
);
277 /* Right now clear the port context */
278 Message
->PortContext
= NULL
;
280 /* Check if this is a not connection port */
281 if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) != LPCP_CONNECTION_PORT
)
283 /* We want the connected port */
284 QueuePort
= Port
->ConnectedPort
;
287 /* We have no connected port, fail */
288 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
289 return STATUS_PORT_DISCONNECTED
;
292 /* This will be the rundown port */
293 ReplyPort
= QueuePort
;
295 /* Check if this is a communication port */
296 if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) == LPCP_CLIENT_PORT
)
298 /* Copy the port context and use the connection port */
299 Message
->PortContext
= QueuePort
->PortContext
;
300 ConnectionPort
= QueuePort
= Port
->ConnectionPort
;
304 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
305 return STATUS_PORT_DISCONNECTED
;
308 else if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) !=
309 LPCP_COMMUNICATION_PORT
)
311 /* Use the connection port for anything but communication ports */
312 ConnectionPort
= QueuePort
= Port
->ConnectionPort
;
316 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
317 return STATUS_PORT_DISCONNECTED
;
321 /* Reference the connection port if it exists */
322 if (ConnectionPort
) ObReferenceObject(ConnectionPort
);
326 /* Otherwise, for a connection port, use the same port object */
327 QueuePort
= ReplyPort
= Port
;
330 /* No reply thread */
331 Message
->RepliedToThread
= NULL
;
332 Message
->SenderPort
= Port
;
334 /* Generate the Message ID and set it */
335 Message
->Request
.MessageId
= LpcpNextMessageId
++;
336 if (!LpcpNextMessageId
) LpcpNextMessageId
= 1;
337 Message
->Request
.CallbackId
= 0;
339 /* Set the message ID for our thread now */
340 Thread
->LpcReplyMessageId
= Message
->Request
.MessageId
;
341 Thread
->LpcReplyMessage
= NULL
;
343 /* Insert the message in our chain */
344 InsertTailList(&QueuePort
->MsgQueue
.ReceiveHead
, &Message
->Entry
);
345 InsertTailList(&ReplyPort
->LpcReplyChainHead
, &Thread
->LpcReplyChain
);
346 LpcpSetPortToThread(Thread
, Port
);
348 /* Release the lock and get the semaphore we'll use later */
349 KeEnterCriticalRegion();
350 KeReleaseGuardedMutex(&LpcpLock
);
351 Semaphore
= QueuePort
->MsgQueue
.Semaphore
;
353 /* If this is a waitable port, wake it up */
354 if (QueuePort
->Flags
& LPCP_WAITABLE_PORT
)
357 KeSetEvent(&QueuePort
->WaitEvent
, IO_NO_INCREMENT
, FALSE
);
361 /* Now release the semaphore */
362 LpcpCompleteWait(Semaphore
);
363 KeLeaveCriticalRegion();
365 /* And let's wait for the reply */
366 LpcpReplyWait(&Thread
->LpcReplySemaphore
, PreviousMode
);
368 /* Acquire the LPC lock */
369 KeAcquireGuardedMutex(&LpcpLock
);
371 /* Get the LPC Message and clear our thread's reply data */
372 Message
= LpcpGetMessageFromThread(Thread
);
373 Thread
->LpcReplyMessage
= NULL
;
374 Thread
->LpcReplyMessageId
= 0;
376 /* Check if we have anything on the reply chain*/
377 if (!IsListEmpty(&Thread
->LpcReplyChain
))
379 /* Remove this thread and reinitialize the list */
380 RemoveEntryList(&Thread
->LpcReplyChain
);
381 InitializeListHead(&Thread
->LpcReplyChain
);
384 /* Release the lock */
385 KeReleaseGuardedMutex(&LpcpLock
);
387 /* Check if we got a reply */
388 if (Status
== STATUS_SUCCESS
)
390 /* Check if we have a valid message */
393 LPCTRACE(LPC_SEND_DEBUG
,
394 "Reply Messages: %p/%p\n",
396 (&Message
->Request
) + 1);
398 /* Move the message */
399 LpcpMoveMessage(LpcReply
,
401 (&Message
->Request
) + 1,
405 /* Acquire the lock */
406 KeAcquireGuardedMutex(&LpcpLock
);
408 /* Check if we replied to a thread */
409 if (Message
->RepliedToThread
)
412 ObDereferenceObject(Message
->RepliedToThread
);
413 Message
->RepliedToThread
= NULL
;
416 /* Free the message */
417 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
421 /* We don't have a reply */
422 Status
= STATUS_LPC_REPLY_LOST
;
427 /* The wait failed, free the message */
428 if (Message
) LpcpFreeToPortZone(Message
, 0);
432 LPCTRACE(LPC_SEND_DEBUG
,
433 "Port: %p. Status: %d\n",
437 /* Dereference the connection port */
438 if (ConnectionPort
) ObDereferenceObject(ConnectionPort
);
447 NtRequestPort(IN HANDLE PortHandle
,
448 IN PPORT_MESSAGE LpcRequest
)
451 PLPCP_PORT_OBJECT Port
, QueuePort
, ConnectionPort
= NULL
;
453 PLPCP_MESSAGE Message
;
454 KPROCESSOR_MODE PreviousMode
= KeGetPreviousMode();
455 PETHREAD Thread
= PsGetCurrentThread();
459 LPCTRACE(LPC_SEND_DEBUG
,
460 "Handle: %p. Message: %p. Type: %lx\n",
463 LpcpGetMessageType(LpcRequest
));
465 /* Get the message type */
466 MessageType
= LpcRequest
->u2
.s2
.Type
| LPC_DATAGRAM
;
468 /* Can't have data information on this type of call */
469 if (LpcRequest
->u2
.s2
.DataInfoOffset
) return STATUS_INVALID_PARAMETER
;
471 /* Validate the length */
472 if (((ULONG
)LpcRequest
->u1
.s1
.DataLength
+ sizeof(PORT_MESSAGE
)) >
473 (ULONG
)LpcRequest
->u1
.s1
.TotalLength
)
476 return STATUS_INVALID_PARAMETER
;
479 /* Reference the object */
480 Status
= ObReferenceObjectByHandle(PortHandle
,
486 if (!NT_SUCCESS(Status
)) return Status
;
488 /* Validate the message length */
489 if (((ULONG
)LpcRequest
->u1
.s1
.TotalLength
> Port
->MaxMessageLength
) ||
490 ((ULONG
)LpcRequest
->u1
.s1
.TotalLength
<= (ULONG
)LpcRequest
->u1
.s1
.DataLength
))
493 ObDereferenceObject(Port
);
494 return STATUS_PORT_MESSAGE_TOO_LONG
;
497 /* Allocate a message from the port zone */
498 Message
= LpcpAllocateFromPortZone();
501 /* Fail if we couldn't allocate a message */
502 ObDereferenceObject(Port
);
503 return STATUS_NO_MEMORY
;
506 /* No callback, just copy the message */
510 LpcpMoveMessage(&Message
->Request
,
516 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
519 LpcpFreeToPortZone(Message
, 0);
520 ObDereferenceObject(Port
);
521 _SEH2_YIELD(return _SEH2_GetExceptionCode());
525 /* Acquire the LPC lock */
526 KeAcquireGuardedMutex(&LpcpLock
);
528 /* Right now clear the port context */
529 Message
->PortContext
= NULL
;
531 /* Check if this is a not connection port */
532 if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) != LPCP_CONNECTION_PORT
)
534 /* We want the connected port */
535 QueuePort
= Port
->ConnectedPort
;
538 /* We have no connected port, fail */
539 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
540 ObDereferenceObject(Port
);
541 return STATUS_PORT_DISCONNECTED
;
544 /* Check if this is a communication port */
545 if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) == LPCP_CLIENT_PORT
)
547 /* Copy the port context and use the connection port */
548 Message
->PortContext
= QueuePort
->PortContext
;
549 ConnectionPort
= QueuePort
= Port
->ConnectionPort
;
553 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
554 ObDereferenceObject(Port
);
555 return STATUS_PORT_DISCONNECTED
;
558 else if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) !=
559 LPCP_COMMUNICATION_PORT
)
561 /* Use the connection port for anything but communication ports */
562 ConnectionPort
= QueuePort
= Port
->ConnectionPort
;
566 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
567 ObDereferenceObject(Port
);
568 return STATUS_PORT_DISCONNECTED
;
572 /* Reference the connection port if it exists */
573 if (ConnectionPort
) ObReferenceObject(ConnectionPort
);
577 /* Otherwise, for a connection port, use the same port object */
581 /* Reference QueuePort if we have it */
582 if (QueuePort
&& ObReferenceObjectSafe(QueuePort
))
584 /* Set sender's port */
585 Message
->SenderPort
= Port
;
587 /* Generate the Message ID and set it */
588 Message
->Request
.MessageId
= LpcpNextMessageId
++;
589 if (!LpcpNextMessageId
) LpcpNextMessageId
= 1;
590 Message
->Request
.CallbackId
= 0;
592 /* No Message ID for the thread */
593 Thread
->LpcReplyMessageId
= 0;
595 /* Insert the message in our chain */
596 InsertTailList(&QueuePort
->MsgQueue
.ReceiveHead
, &Message
->Entry
);
598 /* Release the lock and the semaphore */
599 KeEnterCriticalRegion();
600 KeReleaseGuardedMutex(&LpcpLock
);
601 LpcpCompleteWait(QueuePort
->MsgQueue
.Semaphore
);
603 /* If this is a waitable port, wake it up */
604 if (QueuePort
->Flags
& LPCP_WAITABLE_PORT
)
607 KeSetEvent(&QueuePort
->WaitEvent
, IO_NO_INCREMENT
, FALSE
);
610 KeLeaveCriticalRegion();
612 /* Dereference objects */
613 if (ConnectionPort
) ObDereferenceObject(ConnectionPort
);
614 ObDereferenceObject(QueuePort
);
615 ObDereferenceObject(Port
);
616 LPCTRACE(LPC_SEND_DEBUG
, "Port: %p. Message: %p\n", QueuePort
, Message
);
617 return STATUS_SUCCESS
;
620 Status
= STATUS_PORT_DISCONNECTED
;
622 /* All done with a failure*/
623 LPCTRACE(LPC_SEND_DEBUG
,
624 "Port: %p. Status: %d\n",
628 /* The wait failed, free the message */
629 if (Message
) LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
631 ObDereferenceObject(Port
);
632 if (ConnectionPort
) ObDereferenceObject(ConnectionPort
);
641 NtRequestWaitReplyPort(IN HANDLE PortHandle
,
642 IN PPORT_MESSAGE LpcRequest
,
643 IN OUT PPORT_MESSAGE LpcReply
)
645 PLPCP_PORT_OBJECT Port
, QueuePort
, ReplyPort
, ConnectionPort
= NULL
;
646 KPROCESSOR_MODE PreviousMode
= KeGetPreviousMode();
648 PLPCP_MESSAGE Message
;
649 PETHREAD Thread
= PsGetCurrentThread();
651 PKSEMAPHORE Semaphore
;
654 LPCTRACE(LPC_SEND_DEBUG
,
655 "Handle: %p. Messages: %p/%p. Type: %lx\n",
659 LpcpGetMessageType(LpcRequest
));
661 /* Check if the thread is dying */
662 if (Thread
->LpcExitThreadCalled
) return STATUS_THREAD_IS_TERMINATING
;
664 /* Check if this is an LPC Request */
665 if (LpcpGetMessageType(LpcRequest
) == LPC_REQUEST
)
667 /* Then it's a callback */
670 else if (LpcpGetMessageType(LpcRequest
))
672 /* This is a not kernel-mode message */
673 return STATUS_INVALID_PARAMETER
;
677 /* This is a kernel-mode message without a callback */
678 LpcRequest
->u2
.s2
.Type
|= LPC_REQUEST
;
682 /* Get the message type */
683 MessageType
= LpcRequest
->u2
.s2
.Type
;
685 /* Validate the length */
686 if (((ULONG
)LpcRequest
->u1
.s1
.DataLength
+ sizeof(PORT_MESSAGE
)) >
687 (ULONG
)LpcRequest
->u1
.s1
.TotalLength
)
690 return STATUS_INVALID_PARAMETER
;
693 /* Reference the object */
694 Status
= ObReferenceObjectByHandle(PortHandle
,
700 if (!NT_SUCCESS(Status
)) return Status
;
702 /* Validate the message length */
703 if (((ULONG
)LpcRequest
->u1
.s1
.TotalLength
> Port
->MaxMessageLength
) ||
704 ((ULONG
)LpcRequest
->u1
.s1
.TotalLength
<= (ULONG
)LpcRequest
->u1
.s1
.DataLength
))
707 ObDereferenceObject(Port
);
708 return STATUS_PORT_MESSAGE_TOO_LONG
;
711 /* Allocate a message from the port zone */
712 Message
= LpcpAllocateFromPortZone();
715 /* Fail if we couldn't allocate a message */
716 ObDereferenceObject(Port
);
717 return STATUS_NO_MEMORY
;
720 /* Check if this is a callback */
724 Semaphore
= NULL
; // we'd use the Thread Semaphore here
729 /* No callback, just copy the message */
733 LpcpMoveMessage(&Message
->Request
,
739 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
742 LpcpFreeToPortZone(Message
, 0);
743 ObDereferenceObject(Port
);
744 _SEH2_YIELD(return _SEH2_GetExceptionCode());
748 /* Acquire the LPC lock */
749 KeAcquireGuardedMutex(&LpcpLock
);
751 /* Right now clear the port context */
752 Message
->PortContext
= NULL
;
754 /* Check if this is a not connection port */
755 if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) != LPCP_CONNECTION_PORT
)
757 /* We want the connected port */
758 QueuePort
= Port
->ConnectedPort
;
761 /* We have no connected port, fail */
762 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
763 ObDereferenceObject(Port
);
764 return STATUS_PORT_DISCONNECTED
;
767 /* This will be the rundown port */
768 ReplyPort
= QueuePort
;
770 /* Check if this is a communication port */
771 if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) == LPCP_CLIENT_PORT
)
773 /* Copy the port context and use the connection port */
774 Message
->PortContext
= QueuePort
->PortContext
;
775 ConnectionPort
= QueuePort
= Port
->ConnectionPort
;
779 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
780 ObDereferenceObject(Port
);
781 return STATUS_PORT_DISCONNECTED
;
784 else if ((Port
->Flags
& LPCP_PORT_TYPE_MASK
) !=
785 LPCP_COMMUNICATION_PORT
)
787 /* Use the connection port for anything but communication ports */
788 ConnectionPort
= QueuePort
= Port
->ConnectionPort
;
792 LpcpFreeToPortZone(Message
, LPCP_LOCK_HELD
| LPCP_LOCK_RELEASE
);
793 ObDereferenceObject(Port
);
794 return STATUS_PORT_DISCONNECTED
;
798 /* Reference the connection port if it exists */
799 if (ConnectionPort
) ObReferenceObject(ConnectionPort
);
803 /* Otherwise, for a connection port, use the same port object */
804 QueuePort
= ReplyPort
= Port
;
807 /* No reply thread */
808 Message
->RepliedToThread
= NULL
;
809 Message
->SenderPort
= Port
;
811 /* Generate the Message ID and set it */
812 Message
->Request
.MessageId
= LpcpNextMessageId
++;
813 if (!LpcpNextMessageId
) LpcpNextMessageId
= 1;
814 Message
->Request
.CallbackId
= 0;
816 /* Set the message ID for our thread now */
817 Thread
->LpcReplyMessageId
= Message
->Request
.MessageId
;
818 Thread
->LpcReplyMessage
= NULL
;
820 /* Insert the message in our chain */
821 InsertTailList(&QueuePort
->MsgQueue
.ReceiveHead
, &Message
->Entry
);
822 InsertTailList(&ReplyPort
->LpcReplyChainHead
, &Thread
->LpcReplyChain
);
823 LpcpSetPortToThread(Thread
, Port
);
825 /* Release the lock and get the semaphore we'll use later */
826 KeEnterCriticalRegion();
827 KeReleaseGuardedMutex(&LpcpLock
);
828 Semaphore
= QueuePort
->MsgQueue
.Semaphore
;
830 /* If this is a waitable port, wake it up */
831 if (QueuePort
->Flags
& LPCP_WAITABLE_PORT
)
834 KeSetEvent(&QueuePort
->WaitEvent
, IO_NO_INCREMENT
, FALSE
);
838 /* Now release the semaphore */
839 LpcpCompleteWait(Semaphore
);
840 KeLeaveCriticalRegion();
842 /* And let's wait for the reply */
843 LpcpReplyWait(&Thread
->LpcReplySemaphore
, PreviousMode
);
845 /* Acquire the LPC lock */
846 KeAcquireGuardedMutex(&LpcpLock
);
848 /* Get the LPC Message and clear our thread's reply data */
849 Message
= LpcpGetMessageFromThread(Thread
);
850 Thread
->LpcReplyMessage
= NULL
;
851 Thread
->LpcReplyMessageId
= 0;
853 /* Check if we have anything on the reply chain*/
854 if (!IsListEmpty(&Thread
->LpcReplyChain
))
856 /* Remove this thread and reinitialize the list */
857 RemoveEntryList(&Thread
->LpcReplyChain
);
858 InitializeListHead(&Thread
->LpcReplyChain
);
861 /* Release the lock */
862 KeReleaseGuardedMutex(&LpcpLock
);
864 /* Check if we got a reply */
865 if (Status
== STATUS_SUCCESS
)
867 /* Check if we have a valid message */
870 LPCTRACE(LPC_SEND_DEBUG
,
871 "Reply Messages: %p/%p\n",
873 (&Message
->Request
) + 1);
875 /* Move the message */
878 LpcpMoveMessage(LpcReply
,
880 (&Message
->Request
) + 1,
884 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER
)
886 Status
= _SEH2_GetExceptionCode();
890 /* Check if this is an LPC request with data information */
891 if ((LpcpGetMessageType(&Message
->Request
) == LPC_REQUEST
) &&
892 (Message
->Request
.u2
.s2
.DataInfoOffset
))
894 /* Save the data information */
895 LpcpSaveDataInfoMessage(Port
, Message
, 0);
899 /* Otherwise, just free it */
900 LpcpFreeToPortZone(Message
, 0);
905 /* We don't have a reply */
906 Status
= STATUS_LPC_REPLY_LOST
;
911 /* The wait failed, free the message */
912 if (Message
) LpcpFreeToPortZone(Message
, 0);
916 LPCTRACE(LPC_SEND_DEBUG
,
917 "Port: %p. Status: %d\n",
920 ObDereferenceObject(Port
);
921 if (ConnectionPort
) ObDereferenceObject(ConnectionPort
);