subsys/win32k/eng/device.c

   1 /*
   2  *  ReactOS W32 Subsystem
   3  *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * COPYRIGHT:         See COPYING in the top level directory
  22  * PROJECT:           ReactOS kernel
  23  * PURPOSE:           GDI Driver Device Functions
  24  * FILE:              subsys/win32k/eng/device.c
  25  * PROGRAMER:         Jason Filby
  26  * REVISION HISTORY:
  27  *                 3/7/1999: Created
  28  */
  29
  30 #include <ddk/ntddk.h>
  31 #include <win32k/misc.h>
  32
  33 #define NDEBUG
  34 #include <debug.h>
  35
  36 /*
  37  * @implemented
  38  */
  39 DWORD STDCALL
  40 EngDeviceIoControl(HANDLE  hDevice,
  41                    DWORD   dwIoControlCode,
  42                    LPVOID  lpInBuffer,
  43                    DWORD   nInBufferSize,
  44                    LPVOID  lpOutBuffer,
  45                    DWORD   nOutBufferSize,
  46                    DWORD *lpBytesReturned)
  47 {
  48   PIRP Irp;
  49   NTSTATUS Status;
  50   KEVENT Event;
  51   IO_STATUS_BLOCK Iosb;
  52   PFILE_OBJECT FileObject;
  53   PEPROCESS CurrentProcess;
  54
  55   DPRINT("EngDeviceIoControl() called\n");
  56
  57   KeInitializeEvent(&Event, SynchronizationEvent, FALSE);
  58
  59   CurrentProcess = PsGetCurrentProcess();
  60   if (CurrentProcess != Win32kDeviceProcess)
  61     {
  62       /* Switch to process context in which hDevice is valid */
  63       KeAttachProcess(Win32kDeviceProcess);
  64     }
  65
  66   Status = ObReferenceObjectByHandle(hDevice,
  67                                      FILE_READ_DATA | FILE_WRITE_DATA,
  68                                      IoFileObjectType,
  69                                      KernelMode,
  70                                      (PVOID *)&FileObject,
  71                                      NULL);
  72   if (CurrentProcess != Win32kDeviceProcess)
  73     {
  74       KeDetachProcess();
  75     }
  76
  77   if (!NT_SUCCESS(Status))
  78     {
  79       return(Status);
  80     }
  81
  82   Irp = IoBuildDeviceIoControlRequest(dwIoControlCode,
  83                                       FileObject->DeviceObject,
  84                                       lpInBuffer,
  85                                       nInBufferSize,
  86                                       lpOutBuffer,
  87                                       nOutBufferSize, FALSE, &Event, &Iosb);
  88
  89   Status = IoCallDriver(FileObject->DeviceObject, Irp);
  90
  91   if (Status == STATUS_PENDING)
  92   {
  93     (void) KeWaitForSingleObject(&Event, Executive, KernelMode, TRUE, 0);
  94   }
  95
  96   ObDereferenceObject(FileObject);
  97
  98   return (Status);
  99 }
 100 /* EOF */