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Dispatch.c
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Upload Date: 2010-03-06
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Communication Document

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C/C++

Dispatch.c：Code Content
  1. /*++
  3. Copyright (c) 2005  Changzhi Zhou All Rights Reserved
  5. Module Name:
  7.     Dispatch.c
  9. Abstract:
  11.     This module works for Dispatch routines which are
  12. Create, Close, Cleanup, PowerDispatch.
  14. Environment:
  16.     Kernel mode
  18. Revision History:
  20. Changzhi Zhou Dec 20  2004
  22. --*/
  23. #include <ntddk.h>
  24. #include "main.h"
  25. #include "..incwdmioctl.h"
  27. #ifdef ALLOC_PRAGMA
  28. #pragma alloc_text (PAGE, SamplePowerDispatch)
  29. #endif
  31. NTSTATUS SampleCreate(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
  32. {                           // SampleCreate
  33.     PDEVICE_EXTENSION   deviceExtension;
  34. NTSTATUS status;
  35. KIRQL oldIrql;
  36.     
  37. PAGED_CODE();
  38.     
  39. DbgPrint("--- IRP_MJ_CREATn");
  40. status = STATUS_SUCCESS;
  41. deviceExtension = DeviceObject->DeviceExtension;
  42. if( ( deviceExtension->DevicePnPState != Working) ||
  43. deviceExtension->bIsOpen )
  44. {
  45. status = STATUS_INVALID_DEVICE_STATE;
  46. return CompleteRequest(Irp, status, 0);
  47.     }
  48. deviceExtension->bIsOpen = TRUE;
  49. SampleIoIncrement ( deviceExtension );
  50. return CompleteRequest(Irp, status, 0);
  51. }                           // SampleCreate
  53. NTSTATUS SampleClose(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
  54. {                           // SampleClose
  55. NTSTATUS status;
  56.     PDEVICE_EXTENSION           deviceExtension;
  58.     PAGED_CODE();
  59. status = STATUS_SUCCESS;
  60.   deviceExtension = DeviceObject->DeviceExtension;
  61. DbgPrint("--- IRP_MJ_CLOSEn");
  62. deviceExtension->bIsOpen = FALSE;
  63. SampleIoDecrement ( deviceExtension );
  64. return CompleteRequest(Irp, STATUS_SUCCESS, 0);
  65. }                           // SampleClose
  67. NTSTATUS SampleCleanup(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)
  68. {
  69. NTSTATUS status;
  70. PIO_STACK_LOCATION IrpStack;
  71.     PDEVICE_EXTENSION           deviceExtension;
  72. KIRQL oldIrql;
  74.     PAGED_CODE();
  75. deviceExtension = DeviceObject->DeviceExtension;
  76.     DbgPrint("Entering IRP_MJ_CLEANUPn");
  77. status = STATUS_SUCCESS;
  78. IrpStack = IoGetCurrentIrpStackLocation(Irp);
  80. KeAcquireSpinLock ( &deviceExtension->ThreadSpinLock, &oldIrql );
  81. if( deviceExtension->WaitOnMaskIrp ){ // 取消上一次的WAIT_ON_MASK Irp
  82. *((ULONG *)deviceExtension->WaitOnMaskIrp->AssociatedIrp.SystemBuffer) = 0;
  83. CompleteRequest( deviceExtension->WaitOnMaskIrp, STATUS_SUCCESS, sizeof( ULONG ));
  84. SampleIoDecrement ( deviceExtension );
  85. deviceExtension->WaitOnMaskIrp = NULL;
  86. }
  87. KeReleaseSpinLock ( &deviceExtension->ThreadSpinLock, oldIrql );
  88. return CompleteRequest( Irp, status, 0 );
  89. }
  92. NTSTATUS
  93. SamplePowerDispatch(
  94.     IN PDEVICE_OBJECT    DeviceObject,
  95.     IN PIRP              Irp
  96.     )
  97. /*++
  99. Routine Description:
  101.     This routine is the dispatch routine for power irps.
  103. Arguments:
  105.     DeviceObject - Pointer to the device object.
  107.     Irp - Pointer to the request packet.
  109. Return Value:
  111.     NT Status code
  112. --*/
  113. {
  114. NTSTATUS status;
  115.     PDEVICE_EXTENSION   deviceExtension;
  116.     
  117.     PAGED_CODE ();
  119. DebugPrint(("Enter DispatchPower routine...n"));
  121.     deviceExtension = (PDEVICE_EXTENSION) DeviceObject->DeviceExtension;
  122.     PoStartNextPowerIrp(Irp);
  123.     IoSkipCurrentIrpStackLocation(Irp);
  124. DebugPrint(("NextLowerDriver:  0x%xn", deviceExtension->NextLowerDriver ));
  125. status = PoCallDriver(deviceExtension->NextLowerDriver, Irp);
  127. DebugPrint(("-Exit Powern") );
  128.     return status;
  129. }