ReactOS 0.4.15-dev-7788-g1ad9096
obwait.c
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1/*
2 * PROJECT: ReactOS Kernel
3 * LICENSE: GPL - See COPYING in the top level directory
4 * FILE: ntoskrnl/ob/obwait.c
5 * PURPOSE: Handles Waiting on Objects
6 * PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
7 * Thomas Weidenmueller (w3seek@reactos.org)
8 */
9
10/* INCLUDES ******************************************************************/
11
12#include <ntoskrnl.h>
13#define NDEBUG
14#include <debug.h>
15
16/* FUNCTIONS *****************************************************************/
17
18/*++
19* @name NtWaitForMultipleObjects
20* @implemented NT4
21*
22* The NtWaitForMultipleObjects routine <FILLMEIN>
23*
24* @param ObjectCount
25* <FILLMEIN>
26*
27* @param HandleArray
28* <FILLMEIN>
29*
30* @param WaitType
31* <FILLMEIN>
32*
33* @param Alertable
34* <FILLMEIN>
35*
36* @param TimeOut
37* <FILLMEIN>
38*
39* @return STATUS_SUCCESS or appropriate error value.
40*
41* @remarks None.
42*
43*--*/
47 IN PHANDLE HandleArray,
51{
55 PVOID WaitObjects[MAXIMUM_WAIT_OBJECTS];
56 ULONG i, ReferencedObjects, j;
58 LARGE_INTEGER SafeTimeOut;
59 BOOLEAN LockInUse;
60 PHANDLE_TABLE_ENTRY HandleEntry;
61 POBJECT_HEADER ObjectHeader;
64 PVOID DefaultObject;
66 PAGED_CODE();
67
68 /* Check for valid Object Count */
70 {
71 /* Fail */
73 }
74
75 /* Check for valid Wait Type */
76 if ((WaitType != WaitAll) && (WaitType != WaitAny))
77 {
78 /* Fail */
80 }
81
82 /* Enter SEH */
85 {
86 /* Probe for user mode */
88 {
89 /* Check if we have a timeout */
90 if (TimeOut)
91 {
92 /* Make a local copy of the timeout on the stack */
93 SafeTimeOut = ProbeForReadLargeInteger(TimeOut);
94 TimeOut = &SafeTimeOut;
95 }
96
97 /* Probe all the handles */
98 ProbeForRead(HandleArray,
99 ObjectCount * sizeof(HANDLE),
100 sizeof(HANDLE));
101 }
102
103 /*
104 * Make a copy so we don't have to guard with SEH later and keep
105 * track of what objects we referenced if dereferencing pointers
106 * suddenly fails
107 */
108 RtlCopyMemory(Handles,
109 HandleArray,
110 ObjectCount * sizeof(HANDLE));
111 }
112 _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER) //ExSystemExceptionFilter()
113 {
114 /* Cover up for kernel mode */
116 {
117 /* But don't fail silently */
118 DbgPrint("Mon dieu! Covering up for BAD driver passing invalid pointer (0x%p)! Hon hon hon!\n", HandleArray);
119 }
120
121 /* Return the exception code */
123 }
124 _SEH2_END;
125
126 /* Check if we can use the internal Wait Array */
128 {
129 /* Allocate from Pool */
132 sizeof(KWAIT_BLOCK),
133 TAG_WAIT);
134 if (!WaitBlockArray)
135 {
136 /* Fail */
138 }
139 }
140 else
141 {
142 /* No need for the array */
144 }
145
146 /* Enter a critical region since we'll play with handles */
147 LockInUse = TRUE;
149
150 /* Start the loop */
151 i = 0;
152 ReferencedObjects = 0;
153 do
154 {
155 /* Use the right Executive Handle */
156 if (ObpIsKernelHandle(Handles[i], PreviousMode))
157 {
158 /* Use the System Handle Table and decode */
161
162 /* Get a pointer to it */
164 }
165 else
166 {
167 /* Use the Process' Handle table and get the Ex Handle */
168 HandleTable = PsGetCurrentProcess()->ObjectTable;
169
170 /* Get a pointer to it */
171 HandleEntry = ExMapHandleToPointer(HandleTable, Handles[i]);
172 }
173
174 /* Check if we have an entry */
175 if (!HandleEntry)
176 {
177 /* Fail, handle is invalid */
179 DPRINT1("Invalid handle %p passed to NtWaitForMultipleObjects\n", Handles[i]);
180 goto Quickie;
181 }
182
183 /* Check for synchronize access */
184 GrantedAccess = HandleEntry->GrantedAccess;
186 {
187 /* Unlock the entry and fail */
189 DPRINT1("Handle does not have SYNCHRONIZE access\n");
191 goto Quickie;
192 }
193
194 /* Get the Object Header */
195 ObjectHeader = ObpGetHandleObject(HandleEntry);
196
197 /* Get default Object */
198 DefaultObject = ObjectHeader->Type->DefaultObject;
199
200 /* Check if it's the internal offset */
201 if (IsPointerOffset(DefaultObject))
202 {
203 /* Increase reference count */
205 ReferencedObjects++;
206
207 /* Save the Object and Wait Object, this is a relative offset */
208 Objects[i] = &ObjectHeader->Body;
209 WaitObjects[i] = (PVOID)((ULONG_PTR)&ObjectHeader->Body +
210 (ULONG_PTR)DefaultObject);
211 }
212 else
213 {
214 /* This is our internal Object */
215 ReferencedObjects++;
216 Objects[i] = NULL;
217 WaitObjects[i] = DefaultObject;
218 }
219
220 /* Unlock the Handle Table Entry */
222
223 /* Keep looping */
224 i++;
225 } while (i < ObjectCount);
226
227 /* For a Waitall, we can't have the same object more then once */
228 if (WaitType == WaitAll)
229 {
230 /* Clear the main loop variable */
231 i = 0;
232
233 /* Start the loop */
234 do
235 {
236 /* Check the current and forward object */
237 for (j = i + 1; j < ObjectCount; j++)
238 {
239 /* Make sure they don't match */
240 if (WaitObjects[i] == WaitObjects[j])
241 {
242 /* Fail */
244 DPRINT1("Passed a duplicate object to NtWaitForMultipleObjects\n");
245 goto Quickie;
246 }
247 }
248
249 /* Keep looping */
250 i++;
251 } while (i < ObjectCount);
252 }
253
254 /* Now we can finally wait. Always use SEH since it can raise an exception */
256 {
257 /* We're done playing with handles */
258 LockInUse = FALSE;
260
261 /* Do the kernel wait */
263 WaitObjects,
264 WaitType,
267 Alertable,
268 TimeOut,
270 }
274 {
275 /* Get the exception code */
277 }
278 _SEH2_END;
279
280Quickie:
281 /* First derefence */
282 while (ReferencedObjects)
283 {
284 /* Decrease the number of objects */
285 ReferencedObjects--;
286
287 /* Check if we had a valid object in this position */
288 if (Objects[ReferencedObjects])
289 {
290 /* Dereference it */
291 ObDereferenceObject(Objects[ReferencedObjects]);
292 }
293 }
294
295 /* Free wait block array */
297
298 /* Re-enable APCs if needed */
299 if (LockInUse) KeLeaveCriticalRegion();
300
301 /* Return status */
302 return Status;
303}
304
305/*++
306* @name NtWaitForMultipleObjects32
307* @implemented NT5.1
308*
309* The NtWaitForMultipleObjects32 routine <FILLMEIN>
310*
311* @param ObjectCount
312* <FILLMEIN>
313*
314* @param HandleArray
315* <FILLMEIN>
316*
317* @param WaitType
318* <FILLMEIN>
319*
320* @param Alertable
321* <FILLMEIN>
322*
323* @param TimeOut
324* <FILLMEIN>
325*
326* @return STATUS_SUCCESS or appropriate error value.
327*
328* @remarks None.
329*
330*--*/
332NTAPI
334 IN PLONG Handles,
337 IN PLARGE_INTEGER TimeOut OPTIONAL)
338{
339 /* FIXME WOW64 */
341 (PHANDLE)Handles,
342 WaitType,
343 Alertable,
344 TimeOut);
345}
346
347/*++
348* @name NtWaitForSingleObject
349* @implemented NT4
350*
351* The NtWaitForSingleObject routine <FILLMEIN>
352*
353* @param ObjectHandle
354* <FILLMEIN>
355*
356* @param Alertable
357* <FILLMEIN>
358*
359* @param TimeOut
360* <FILLMEIN>
361*
362* @return STATUS_SUCCESS or appropriate error value.
363*
364* @remarks None.
365*
366*--*/
368NTAPI
371 IN PLARGE_INTEGER TimeOut OPTIONAL)
372{
373 PVOID Object, WaitableObject;
375 LARGE_INTEGER SafeTimeOut;
377
378 /* Check if we came with a timeout from user mode */
380 if ((TimeOut) && (PreviousMode != KernelMode))
381 {
382 /* Enter SEH for proving */
384 {
385 /* Make a copy on the stack */
386 SafeTimeOut = ProbeForReadLargeInteger(TimeOut);
387 TimeOut = &SafeTimeOut;
388 }
390 {
391 /* Return the exception code */
393 }
394 _SEH2_END;
395 }
396
397 /* Get the Object */
398 Status = ObReferenceObjectByHandle(ObjectHandle,
400 NULL,
402 &Object,
403 NULL);
404 if (NT_SUCCESS(Status))
405 {
406 /* Get the Waitable Object */
407 WaitableObject = OBJECT_TO_OBJECT_HEADER(Object)->Type->DefaultObject;
408
409 /* Is it an offset for internal objects? */
410 if (IsPointerOffset(WaitableObject))
411 {
412 /* Turn it into a pointer */
413 WaitableObject = (PVOID)((ULONG_PTR)Object +
414 (ULONG_PTR)WaitableObject);
415 }
416
417 /* SEH this since it can also raise an exception */
419 {
420 /* Ask the kernel to do the wait */
421 Status = KeWaitForSingleObject(WaitableObject,
424 Alertable,
425 TimeOut);
426 }
430 {
431 /* Get the exception code */
433 }
434 _SEH2_END;
435
436 /* Dereference the Object */
438 }
439 else
440 {
441 DPRINT1("Failed to reference the handle with status 0x%x\n", Status);
442 }
443
444 /* Return the status */
445 return Status;
446}
447
448/*++
449* @name NtSignalAndWaitForSingleObject
450* @implemented NT4
451*
452* The NtSignalAndWaitForSingleObject routine <FILLMEIN>
453*
454* @param ObjectHandleToSignal
455* <FILLMEIN>
456*
457* @param WaitableObjectHandle
458* <FILLMEIN>
459*
460* @param Alertable
461* <FILLMEIN>
462*
463* @param TimeOut
464* <FILLMEIN>
465*
466* @return STATUS_SUCCESS or appropriate error value.
467*
468* @remarks None.
469*
470*--*/
472NTAPI
474 IN HANDLE WaitableObjectHandle,
476 IN PLARGE_INTEGER TimeOut OPTIONAL)
477{
480 PVOID SignalObj, WaitObj, WaitableObject;
481 LARGE_INTEGER SafeTimeOut;
482 OBJECT_HANDLE_INFORMATION HandleInfo;
484
485 /* Check if we came with a timeout from user mode */
487 if ((TimeOut) && (PreviousMode != KernelMode))
488 {
489 /* Enter SEH for probing */
491 {
492 /* Make a copy on the stack */
493 SafeTimeOut = ProbeForReadLargeInteger(TimeOut);
494 TimeOut = &SafeTimeOut;
495 }
497 {
498 /* Return the exception code */
500 }
501 _SEH2_END;
502 }
503
504 /* Start by getting the signal object*/
505 Status = ObReferenceObjectByHandle(ObjectHandleToSignal,
506 0,
507 NULL,
509 &SignalObj,
510 &HandleInfo);
511 if (!NT_SUCCESS(Status)) return Status;
512
513 /* Now get the wait object */
514 Status = ObReferenceObjectByHandle(WaitableObjectHandle,
516 NULL,
518 &WaitObj,
519 NULL);
520 if (!NT_SUCCESS(Status))
521 {
522 /* Failed to reference the wait object */
523 ObDereferenceObject(SignalObj);
524 return Status;
525 }
526
527 /* Get the real waitable object */
528 WaitableObject = OBJECT_TO_OBJECT_HEADER(WaitObj)->Type->DefaultObject;
529
530 /* Handle internal offset */
531 if (IsPointerOffset(WaitableObject))
532 {
533 /* Get real pointer */
534 WaitableObject = (PVOID)((ULONG_PTR)WaitObj +
535 (ULONG_PTR)WaitableObject);
536 }
537
538 /* Check Signal Object Type */
539 Type = OBJECT_TO_OBJECT_HEADER(SignalObj)->Type;
540 if (Type == ExEventObjectType)
541 {
542 /* Check if we came from user-mode without the right access */
543 if ((PreviousMode != KernelMode) &&
544 !(HandleInfo.GrantedAccess & EVENT_MODIFY_STATE))
545 {
546 /* Fail: lack of rights */
548 goto Quickie;
549 }
550
551 /* Set the Event */
552 KeSetEvent(SignalObj, EVENT_INCREMENT, TRUE);
553 }
554 else if (Type == ExMutantObjectType)
555 {
556 /* This can raise an exception */
558 {
559 /* Release the mutant */
561 }
566 {
567 /* Get the exception code */
569 }
570 _SEH2_END;
571 }
572 else if (Type == ExSemaphoreObjectType)
573 {
574 /* Check if we came from user-mode without the right access */
575 if ((PreviousMode != KernelMode) &&
577 {
578 /* Fail: lack of rights */
580 goto Quickie;
581 }
582
583 /* This can raise an exception*/
585 {
586 /* Release the semaphore */
588 }
592 {
593 /* Get the exception code */
595 }
596 _SEH2_END;
597 }
598 else
599 {
600 /* This isn't a valid object to be waiting on */
602 }
603
604 /* Make sure we didn't fail */
605 if (NT_SUCCESS(Status))
606 {
607 /* SEH this since it can also raise an exception */
609 {
610 /* Perform the wait now */
611 Status = KeWaitForSingleObject(WaitableObject,
614 Alertable,
615 TimeOut);
616 }
620 {
621 /* Get the exception code */
623 }
624 _SEH2_END;
625 }
626
627 /* We're done here, dereference both objects */
628Quickie:
629 ObDereferenceObject(SignalObj);
630 ObDereferenceObject(WaitObj);
631 return Status;
632}
633
634/* EOF */
#define PAGED_CODE()
#define ExMutantObjectType
Definition: ObTypes.c:122
unsigned char BOOLEAN
Type
Definition: Type.h:7
LONG NTSTATUS
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Definition: precomp.h:8
LONG ObjectCount
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GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
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GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint GLint GLint j
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@ WaitAll
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WaitType
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@ UserRequest
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