ReactOS 0.4.15-dev-8096-ga0eec98
callback.c
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1/*
2 * PROJECT: ReactOS Kernel
3 * LICENSE: GPL - See COPYING in the top level directory
4 * FILE: ntoskrnl/ex/callback.c
5 * PURPOSE: Executive callbacks
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/* TYPES *********************************************************************/
16
17/* Mapping for Callback Object */
19{
24};
25
26/* Kernel Default Callbacks */
31{
32 {&SetSystemTimeCallback, L"\\Callback\\SetSystemTime"},
33 {&SetSystemStateCallback, L"\\Callback\\SetSystemState"},
34 {&PowerStateCallback, L"\\Callback\\PowerState"},
35 {NULL, NULL}
36};
37
41
42/* PRIVATE FUNCTIONS *********************************************************/
43
44VOID
47{
48 /* Initialize the fast reference */
50}
51
56{
57 PEX_CALLBACK_ROUTINE_BLOCK CallbackBlock;
58
59 /* Allocate a callback */
60 CallbackBlock = ExAllocatePoolWithTag(PagedPool,
63 if (CallbackBlock)
64 {
65 /* Initialize it */
66 CallbackBlock->Function = Function;
67 CallbackBlock->Context = Context;
69 }
70
71 /* Return it */
72 return CallbackBlock;
73}
74
75VOID
78{
79 /* Just free it from memory */
81}
82
83VOID
86{
87 /* Wait on the rundown */
88 ExWaitForRundownProtectionRelease(&CallbackBlock->RundownProtect);
89}
90
94{
95 /* Return the function */
96 return CallbackBlock->Function;
97}
98
100NTAPI
102{
103 /* Return the context */
104 return CallbackBlock->Context;
105}
106
107VOID
108NTAPI
110 IN PEX_CALLBACK_ROUTINE_BLOCK CallbackBlock)
111{
112 /* Release a fast reference */
113 if (!ExReleaseFastReference(&CallBack->RoutineBlock, CallbackBlock))
114 {
115 /* Take slow path */
116 ExReleaseRundownProtection(&CallbackBlock->RundownProtect);
117 }
118}
119
121NTAPI
123{
124 EX_FAST_REF OldValue;
126 PEX_CALLBACK_ROUTINE_BLOCK CallbackBlock;
127
128 /* Acquire a reference */
129 OldValue = ExAcquireFastReference(&CallBack->RoutineBlock);
130 Count = ExGetCountFastReference(OldValue);
131
132 /* Fail if there isn't any object */
133 if (!ExGetObjectFastReference(OldValue)) return NULL;
134
135 /* Check if we don't have a reference */
136 if (!Count)
137 {
138 /* FIXME: Race */
139 DPRINT1("Unhandled callback race condition\n");
140 ASSERT(FALSE);
141 return NULL;
142 }
143
144 /* Get the callback block */
145 CallbackBlock = ExGetObjectFastReference(OldValue);
146
147 /* Check if this is the last reference */
148 if (Count == 1)
149 {
150 /* Acquire rundown protection */
153 {
154 /* Insert references */
155 if (!ExInsertFastReference(&CallBack->RoutineBlock, CallbackBlock))
156 {
157 /* Backdown the rundown acquire */
160 }
161 }
162 }
163
164 /* Return the callback block */
165 return CallbackBlock;
166}
167
169NTAPI
173{
174 EX_FAST_REF OldValue;
175 PEX_CALLBACK_ROUTINE_BLOCK CallbackBlock;
176 ULONG Count;
177
178 /* Check that we have a new block */
179 if (NewBlock)
180 {
181 /* Acquire rundown */
182 if (!ExfAcquireRundownProtectionEx(&NewBlock->RundownProtect,
183 MAX_FAST_REFS + 1))
184 {
185 /* This should never happen */
186 ASSERTMSG("Callback block is already undergoing rundown\n", FALSE);
187 return FALSE;
188 }
189 }
190
191 /* Do the swap */
192 OldValue = ExCompareSwapFastReference(&CallBack->RoutineBlock,
193 NewBlock,
194 OldBlock);
195
196 /* Get the routine block */
197 CallbackBlock = ExGetObjectFastReference(OldValue);
198 Count = ExGetCountFastReference(OldValue);
199
200 /* Make sure the swap worked */
201 if (CallbackBlock == OldBlock)
202 {
203 /* Make sure we replaced a valid pointer */
204 if (CallbackBlock)
205 {
206 /* Acquire the flush lock and immediately release it */
209
210 /* Release rundown protection */
213 Count + 1);
214 }
215
216 /* Compare worked */
217 return TRUE;
218 }
219 else
220 {
221 /* It failed, check if we had a block */
222 if (NewBlock)
223 {
224 /* We did, remove the references that we had added */
225 ExfReleaseRundownProtectionEx(&NewBlock->RundownProtect,
226 MAX_FAST_REFS + 1);
227 }
228
229 /* Return failure */
230 return FALSE;
231 }
232}
233
234VOID
235NTAPI
237{
238 /* Sanity check */
239 ASSERT(IsListEmpty(&((PCALLBACK_OBJECT)Object)->RegisteredCallbacks));
240}
241
242/*++
243 * @name ExpInitializeCallbacks
244 *
245 * Creates the Callback Object as a valid Object Type in the Kernel.
246 * Internal function, subject to further review
247 *
248 * @return TRUE if the Callback Object Type was successfully created.
249 *
250 * @remarks None
251 *
252 *--*/
253CODE_SEG("INIT")
255NTAPI
257{
261 UNICODE_STRING CallbackName;
263 OBJECT_TYPE_INITIALIZER ObjectTypeInitializer;
265 ULONG i;
266
267 /* Setup lightweight callback lock */
269
270 /* Initialize the Callback Object type */
271 RtlZeroMemory(&ObjectTypeInitializer, sizeof(ObjectTypeInitializer));
272 RtlInitUnicodeString(&Name, L"Callback");
273 ObjectTypeInitializer.Length = sizeof(ObjectTypeInitializer);
274 ObjectTypeInitializer.InvalidAttributes = OBJ_OPENLINK;
275 ObjectTypeInitializer.GenericMapping = ExpCallbackMapping;
276 ObjectTypeInitializer.PoolType = NonPagedPool;
277 ObjectTypeInitializer.DeleteProcedure = ExpDeleteCallback;
278 ObjectTypeInitializer.ValidAccessMask = CALLBACK_ALL_ACCESS;
280 &ObjectTypeInitializer,
281 NULL,
283 if (!NT_SUCCESS(Status)) return FALSE;
284
285 /* Initialize the Object */
287 &DirName,
289 NULL,
291
292 /* Create the Object Directory */
296 if (!NT_SUCCESS(Status)) return FALSE;
297
298 /* Close Handle... */
300
301 /* Initialize Event used when unregistering */
303
304 /* Default NT Kernel Callbacks. */
306 {
307 /* Create the name from the structure */
309
310 /* Initialize the Object Attributes Structure */
312 &CallbackName,
314 NULL,
315 NULL);
316
317 /* Create the Callback Object */
320 TRUE,
321 TRUE);
322 if (!NT_SUCCESS(Status)) return FALSE;
323 }
324
325 /* Everything successful */
326 return TRUE;
327}
328
329/* PUBLIC FUNCTIONS **********************************************************/
330
331/*++
332 * @name ExCreateCallback
333 * @implemented
334 *
335 * Opens or creates a Callback Object. Creates only if Create is true.
336 * Allows multiple Callback Functions to be registered only if
337 * AllowMultipleCallbacks is true.
338 * See: http://www.osronline.com/ddkx/kmarch/k102_967m.htm
339 * http://www.osronline.com/article.cfm?id=24
340 *
341 * @param CallbackObject
342 * Pointer that will receive the Callback Object.
343 *
344 * @param CallbackName
345 * Name of Callback
346 *
347 * @param Create
348 * Determines if the object will be created if it doesn't exit
349 *
350 * @param AllowMultipleCallbacks
351 * Determines if more then one registered callback function
352 * can be attached to this Callback Object.
353 *
354 * @return STATUS_SUCESS if not failed.
355 *
356 * @remarks Must be called at IRQL = PASSIVE_LEVEL
357 *
358 *--*/
360NTAPI
365{
369 PAGED_CODE();
370
371 /* Open a handle to the callback if it exists */
372 if (ObjectAttributes->ObjectName)
373 {
374 /* Open the handle */
378 NULL,
379 0,
380 NULL,
381 &Handle);
382 }
383 else
384 {
385 /* Otherwise, fail */
387 }
388
389 /* We weren't able to open it...should we create it? */
390 if (!(NT_SUCCESS(Status)) && (Create))
391 {
392 /* Create the object */
397 NULL,
398 sizeof(CALLBACK_OBJECT),
399 0,
400 0,
401 (PVOID *)&Callback);
402 if (NT_SUCCESS(Status))
403 {
404 /* Set it up */
405 Callback->Signature = 'llaC';
407 InitializeListHead(&Callback->RegisteredCallbacks);
408 Callback->AllowMultipleCallbacks = AllowMultipleCallbacks;
409
410 /* Insert the object into the object namespace */
412 NULL,
414 0,
415 NULL,
416 &Handle);
417 }
418 }
419
420 /* Check if we have success until here */
421 if (NT_SUCCESS(Status))
422 {
423 /* Get a pointer to the new object from the handle we just got */
425 0,
428 (PVOID *)&Callback,
429 NULL);
430
431 /* Close the Handle, since we now have the pointer */
433 }
434
435 /* Everything went fine, so return a pointer to the Object */
436 if (NT_SUCCESS(Status))
437 {
438 *CallbackObject = Callback;
439 }
440 return Status;
441}
442
443/*++
444 * @name ExNotifyCallback
445 * @implemented
446 *
447 * Calls a function pointer (a registered callback)
448 * See: http://www.osronline.com/ddkx/kmarch/k102_2f5e.htm
449 * http://vmsone.com/~decuslib/vmssig/vmslt99b/nt/wdm-callback.txt
450 *
451 * @param CallbackObject
452 * Which callback to call
453 *
454 * @param Argument1
455 * Pointer/data to send to callback function
456 *
457 * @param Argument2
458 * Pointer/data to send to callback function
459 *
460 * @return None
461 *
462 * @remarks None
463 *
464 *--*/
465VOID
466NTAPI
470{
471 PLIST_ENTRY RegisteredCallbacks;
472 PCALLBACK_REGISTRATION CallbackRegistration;
474
475 /* Check if we don't have an object or registrations */
476 if (!(CallbackObject) ||
477 (IsListEmpty(&CallbackObject->RegisteredCallbacks)))
478 {
479 /* Don't notify */
480 return;
481 }
482
483 /* Acquire the Lock */
484 KeAcquireSpinLock(&CallbackObject->Lock, &OldIrql);
485
486 /* Enumerate through all the registered functions */
487 for (RegisteredCallbacks = CallbackObject->RegisteredCallbacks.Flink;
488 RegisteredCallbacks != &CallbackObject->RegisteredCallbacks;
489 RegisteredCallbacks = RegisteredCallbacks->Flink)
490 {
491 /* Get a pointer to a Callback Registration from the List Entries */
492 CallbackRegistration = CONTAINING_RECORD(RegisteredCallbacks,
494 Link);
495
496 /* Don't bother doing notification if it's pending to be deleted */
497 if (!CallbackRegistration->UnregisterWaiting)
498 {
499 /* Mark the Callback in use, so it won't get deleted */
500 CallbackRegistration->Busy += 1;
501
502 /* Release the Spinlock before making the call */
503 KeReleaseSpinLock(&CallbackObject->Lock, OldIrql);
504
505 /* Call the Registered Function */
506 CallbackRegistration->CallbackFunction(CallbackRegistration->
508 Argument1,
509 Argument2);
510
511 /* Get SpinLock back */
512 KeAcquireSpinLock(&CallbackObject->Lock, &OldIrql);
513
514 /* We are not in use anymore */
515 CallbackRegistration->Busy -= 1;
516
517 /* Check if removal is pending and we're not active */
518 if ((CallbackRegistration->UnregisterWaiting) &&
519 !(CallbackRegistration->Busy))
520 {
521 /* Signal the callback event */
523 }
524 }
525 }
526
527 /* Release the Callback Object */
528 KeReleaseSpinLock(&CallbackObject->Lock, OldIrql);
529}
530
531/*++
532 * @name ExRegisterCallback
533 * @implemented
534 *
535 * Allows a function to associate a callback pointer (Function) to
536 * a created Callback object
537 * See: DDK, OSR, links in ExNotifyCallback
538 *
539 * @param CallbackObject
540 * The Object Created with ExCreateCallBack
541 *
542 * @param CallBackFunction
543 * Pointer to the function to be called back
544 *
545 * @param CallBackContext
546 * Block of memory that can contain user-data which will be
547 * passed on to the callback
548 *
549 * @return A handle to a Callback Registration Structure (MSDN Documentation)
550 *
551 * @remarks None
552 *
553 *--*/
554PVOID
555NTAPI
559{
560 PCALLBACK_REGISTRATION CallbackRegistration = NULL;
562
563 /* Sanity checks */
566
567 /* Create reference to Callback Object */
568 ObReferenceObject(CallbackObject);
569
570 /* Allocate memory for the structure */
571 CallbackRegistration = ExAllocatePoolWithTag(NonPagedPool,
572 sizeof(CALLBACK_REGISTRATION),
574 if (!CallbackRegistration)
575 {
576 /* Dereference and fail */
577 ObDereferenceObject (CallbackObject);
578 return NULL;
579 }
580
581 /* Create Callback Registration */
582 CallbackRegistration->CallbackObject = CallbackObject;
583 CallbackRegistration->CallbackFunction = CallbackFunction;
584 CallbackRegistration->CallbackContext = CallbackContext;
585 CallbackRegistration->Busy = 0;
586 CallbackRegistration->UnregisterWaiting = FALSE;
587
588 /* Acquire SpinLock */
589 KeAcquireSpinLock(&CallbackObject->Lock, &OldIrql);
590
591 /* Check if 1) No Callbacks registered or 2) Multiple Callbacks allowed */
592 if ((CallbackObject->AllowMultipleCallbacks) ||
593 (IsListEmpty(&CallbackObject->RegisteredCallbacks)))
594 {
595 /* Register the callback */
596 InsertTailList(&CallbackObject->RegisteredCallbacks,
597 &CallbackRegistration->Link);
598
599 /* Release SpinLock */
600 KeReleaseSpinLock(&CallbackObject->Lock, OldIrql);
601 }
602 else
603 {
604 /* Release SpinLock */
605 KeReleaseSpinLock(&CallbackObject->Lock, OldIrql);
606
607 /* Free the registration */
608 ExFreePoolWithTag(CallbackRegistration, TAG_CALLBACK_REGISTRATION);
609 CallbackRegistration = NULL;
610
611 /* Dereference the object */
612 ObDereferenceObject(CallbackObject);
613 }
614
615 /* Return handle to Registration Object */
616 return (PVOID)CallbackRegistration;
617}
618
619/*++
620 * @name ExUnregisterCallback
621 * @implemented
622 *
623 * Deregisters a CallBack
624 * See: DDK, OSR, links in ExNotifyCallback
625 *
626 * @param CallbackRegistration
627 * Callback Registration Handle
628 *
629 * @return None
630 *
631 * @remarks None
632 *
633 *--*/
634VOID
635NTAPI
636ExUnregisterCallback(IN PVOID CallbackRegistrationHandle)
637{
638 PCALLBACK_REGISTRATION CallbackRegistration;
639 PCALLBACK_OBJECT CallbackObject;
642
643 /* Convert Handle to valid Structure Pointer */
644 CallbackRegistration = (PCALLBACK_REGISTRATION)CallbackRegistrationHandle;
645
646 /* Get the Callback Object */
647 CallbackObject = CallbackRegistration->CallbackObject;
648
649 /* Lock the Object */
650 KeAcquireSpinLock (&CallbackObject->Lock, &OldIrql);
651
652 /* We can't Delete the Callback if it's in use */
653 while (CallbackRegistration->Busy)
654 {
655 /* Let everyone else know we're unregistering */
656 CallbackRegistration->UnregisterWaiting = TRUE;
657
658 /* We are going to wait for the event, so the Lock isn't necessary */
659 KeReleaseSpinLock(&CallbackObject->Lock, OldIrql);
660
661 /* Make sure the event is cleared */
663
664 /* Wait for the Event */
666 Executive,
668 FALSE,
669 NULL);
670
671 /* We need the Lock again */
672 KeAcquireSpinLock(&CallbackObject->Lock, &OldIrql);
673 }
674
675 /* Remove the Callback */
676 RemoveEntryList(&CallbackRegistration->Link);
677
678 /* It's now safe to release the lock */
679 KeReleaseSpinLock(&CallbackObject->Lock, OldIrql);
680
681 /* Delete this registration */
682 ExFreePoolWithTag(CallbackRegistration, TAG_CALLBACK_REGISTRATION);
683
684 /* Remove the reference */
685 ObDereferenceObject(CallbackObject);
686}
687
688/* EOF */
#define PAGED_CODE()
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@ NotificationEvent
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NTSTATUS NTAPI ObOpenObjectByName(IN POBJECT_ATTRIBUTES ObjectAttributes, IN POBJECT_TYPE ObjectType, IN KPROCESSOR_MODE AccessMode, IN PACCESS_STATE PassedAccessState, IN ACCESS_MASK DesiredAccess, IN OUT PVOID ParseContext, OUT PHANDLE Handle)
Definition: obhandle.c:2532
NTSTATUS NTAPI ObCreateObject(IN KPROCESSOR_MODE ProbeMode OPTIONAL, IN POBJECT_TYPE Type, IN POBJECT_ATTRIBUTES ObjectAttributes OPTIONAL, IN KPROCESSOR_MODE AccessMode, IN OUT PVOID ParseContext OPTIONAL, IN ULONG ObjectSize, IN ULONG PagedPoolCharge OPTIONAL, IN ULONG NonPagedPoolCharge OPTIONAL, OUT PVOID *Object)
Definition: oblife.c:1039
NTSTATUS NTAPI ObCreateObjectType(IN PUNICODE_STRING TypeName, IN POBJECT_TYPE_INITIALIZER ObjectTypeInitializer, IN PVOID Reserved, OUT POBJECT_TYPE *ObjectType)
Definition: oblife.c:1136
NTSTATUS NTAPI ObReferenceObjectByHandle(IN HANDLE Handle, IN ACCESS_MASK DesiredAccess, IN POBJECT_TYPE ObjectType, IN KPROCESSOR_MODE AccessMode, OUT PVOID *Object, OUT POBJECT_HANDLE_INFORMATION HandleInformation OPTIONAL)
Definition: obref.c:494
BOOLEAN FASTCALL ExfAcquireRundownProtectionEx(IN PEX_RUNDOWN_REF RunRef, IN ULONG Count)
Definition: rundown.c:78
VOID FASTCALL ExfReleaseRundownProtectionEx(IN PEX_RUNDOWN_REF RunRef, IN ULONG Count)
Definition: rundown.c:260
#define ASSERT_IRQL_LESS_OR_EQUAL(x)
Definition: debug.h:251
PCALLBACK_OBJECT * CallbackObject
Definition: ex.h:122
KSPIN_LOCK Lock
Definition: extypes.h:513
PCALLBACK_FUNCTION CallbackFunction
Definition: extypes.h:526
PCALLBACK_OBJECT CallbackObject
Definition: extypes.h:525
BOOLEAN UnregisterWaiting
Definition: extypes.h:529
PEX_CALLBACK_FUNCTION Function
Definition: extypes.h:538
EX_RUNDOWN_REF RundownProtect
Definition: extypes.h:537
ULONG_PTR Value
Definition: extypes.h:465
Definition: typedefs.h:120
struct _LIST_ENTRY * Flink
Definition: typedefs.h:121
GENERIC_MAPPING GenericMapping
Definition: obtypes.h:358
OB_DELETE_METHOD DeleteProcedure
Definition: obtypes.h:369
#define TAG_CALLBACK_ROUTINE_BLOCK
Definition: tag.h:21
#define TAG_CALLBACK_REGISTRATION
Definition: tag.h:22
#define RTL_CONSTANT_STRING(s)
Definition: tunneltest.c:14
#define NTAPI
Definition: typedefs.h:36
#define RtlZeroMemory(Destination, Length)
Definition: typedefs.h:262
uint32_t ULONG_PTR
Definition: typedefs.h:65
#define IN
Definition: typedefs.h:39
#define CONTAINING_RECORD(address, type, field)
Definition: typedefs.h:260
uint32_t ULONG
Definition: typedefs.h:59
#define OUT
Definition: typedefs.h:40
#define STATUS_UNSUCCESSFUL
Definition: udferr_usr.h:132
static int Link(const char **args)
Definition: vfdcmd.c:2414
_Must_inspect_result_ _In_ WDFCOLLECTION _In_ WDFOBJECT Object
_In_ WDFINTERRUPT _In_ PFN_WDF_INTERRUPT_SYNCHRONIZE Callback
Definition: wdfinterrupt.h:458
_IRQL_requires_same_ typedef _In_ ULONG _In_ UCHAR _In_ ULONGLONG _In_ ULONGLONG _In_opt_ PEVENT_FILTER_DESCRIPTOR _Inout_opt_ PVOID CallbackContext
Definition: wmitypes.h:60
_IRQL_requires_same_ _In_opt_ PVOID Argument1
Definition: cmtypes.h:696
EX_CALLBACK_FUNCTION * PEX_CALLBACK_FUNCTION
Definition: cmtypes.h:698
_In_ POBJECT_ATTRIBUTES _In_ BOOLEAN _In_ BOOLEAN AllowMultipleCallbacks
Definition: exfuncs.h:750
_In_ PCALLBACK_FUNCTION CallbackFunction
Definition: exfuncs.h:1034
CALLBACK_FUNCTION * PCALLBACK_FUNCTION
Definition: extypes.h:96
_Requires_lock_held_ Interrupt _Releases_lock_ Interrupt _In_ _IRQL_restores_ KIRQL OldIrql
Definition: kefuncs.h:778
@ Executive
Definition: ketypes.h:415
#define ObDereferenceObject
Definition: obfuncs.h:203
#define ObReferenceObject
Definition: obfuncs.h:204