subsys/win32k/eng/device.c

   1 /*
   2  * COPYRIGHT:         See COPYING in the top level directory
   3  * PROJECT:           ReactOS kernel
   4  * PURPOSE:           GDI Driver Device Functions
   5  * FILE:              subsys/win32k/eng/device.c
   6  * PROGRAMER:         Jason Filby
   7  * REVISION HISTORY:
   8  *                 3/7/1999: Created
   9  */
  10
  11 #include <ddk/ntddk.h>
  12 #include <win32k/misc.h>
  13
  14 #define NDEBUG
  15 #include <debug.h>
  16
  17 DWORD STDCALL
  18 EngDeviceIoControl(HANDLE  hDevice,
  19                    DWORD   dwIoControlCode,
  20                    LPVOID  lpInBuffer,
  21                    DWORD   nInBufferSize,
  22                    LPVOID  lpOutBuffer,
  23                    DWORD   nOutBufferSize,
  24                    DWORD *lpBytesReturned)
  25 {
  26   PIRP Irp;
  27   NTSTATUS Status;
  28   KEVENT Event;
  29   IO_STATUS_BLOCK Iosb;
  30   PFILE_OBJECT FileObject;
  31
  32   DPRINT("EngDeviceIoControl() called\n");
  33
  34   KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
  35
  36   /* Switch to process context in which hDevice is valid */
  37   KeAttachProcess(W32kDeviceProcess);
  38
  39   Status = ObReferenceObjectByHandle(hDevice,
  40                                      FILE_READ_DATA | FILE_WRITE_DATA,
  41                                      IoFileObjectType,
  42                                      KernelMode,
  43                                      (PVOID *)&FileObject,
  44                                      NULL);
  45   KeDetachProcess();
  46
  47   if (!NT_SUCCESS(Status))
  48     {
  49       return(Status);
  50     }
  51
  52   Irp = IoBuildDeviceIoControlRequest(dwIoControlCode,
  53                                       FileObject->DeviceObject,
  54                                       lpInBuffer,
  55                                       nInBufferSize,
  56                                       lpOutBuffer,
  57                                       nOutBufferSize, FALSE, &Event, &Iosb);
  58
  59   Status = IoCallDriver(FileObject->DeviceObject, Irp);
  60
  61   if (Status == STATUS_PENDING)
  62   {
  63     (void) KeWaitForSingleObject(&Event, Executive, KernelMode, TRUE, 0);
  64   }
  65
  66   return (Status);
  67 }