DrvHostBase-win.cpp@ 100766

Last change on this file since 100766 was 98103, checked in by vboxsync, 22 months ago
Copyright year updates by scm.
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1	/* $Id: DrvHostBase-win.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* DrvHostBase - Host base drive access driver, Windows specifics.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_DRV_HOST_BASE
33	#include <iprt/nt/nt-and-windows.h>
34	#include <dbt.h>
35	#include <ntddscsi.h>
36
37	#include <iprt/ctype.h>
38	#include <iprt/file.h>
39	#include <iprt/string.h>
40	#include <VBox/err.h>
41	#include <VBox/scsi.h>
42
43	/**
44	* Host backend specific data.
45	*/
46	typedef struct DRVHOSTBASEOS
47	{
48	/** The filehandle of the device. */
49	RTFILE hFileDevice;
50	/** Handle to the window we use to catch the device change broadcast messages. */
51	volatile HWND hwndDeviceChange;
52	/** The unit mask. */
53	DWORD fUnitMask;
54	/** Handle of the poller thread. */
55	RTTHREAD hThrdMediaChange;
56	} DRVHOSTBASEOS;
57	/** Pointer to the host backend specific data. */
58	typedef DRVHOSTBASEOS *PDRVHOSBASEOS;
59	AssertCompile(sizeof(DRVHOSTBASEOS) <= 64);
60
61	#define DRVHOSTBASE_OS_INT_DECLARED
62	#include "DrvHostBase.h"
63
64
65	/*********************************************************************************************************************************
66	* Defined Constants And Macros *
67	*********************************************************************************************************************************/
68	/** Maximum buffer size we support, check whether darwin has some real upper limit. */
69	#define WIN_SCSI_MAX_BUFFER_SIZE (100 * _1K)
70
71
72
73	/**
74	* Window procedure for the invisible window used to catch the WM_DEVICECHANGE broadcasts.
75	*/
76	static LRESULT CALLBACK DeviceChangeWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
77	{
78	Log2(("DeviceChangeWindowProc: hwnd=%08x uMsg=%08x\n", hwnd, uMsg));
79	if (uMsg == WM_DESTROY)
80	{
81	PDRVHOSTBASE pThis = (PDRVHOSTBASE)GetWindowLongPtr(hwnd, GWLP_USERDATA);
82	if (pThis)
83	ASMAtomicXchgSize(&pThis->Os.hwndDeviceChange, NULL);
84	PostQuitMessage(0);
85	}
86
87	if (uMsg != WM_DEVICECHANGE)
88	return DefWindowProc(hwnd, uMsg, wParam, lParam);
89
90	PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)lParam;
91	PDRVHOSTBASE pThis = (PDRVHOSTBASE)GetWindowLongPtr(hwnd, GWLP_USERDATA);
92	Assert(pThis);
93	if (pThis == NULL)
94	return 0;
95
96	switch (wParam)
97	{
98	case DBT_DEVICEARRIVAL:
99	case DBT_DEVICEREMOVECOMPLETE:
100	// Check whether a CD or DVD was inserted into or removed from a drive.
101	if (lpdb->dbch_devicetype == DBT_DEVTYP_VOLUME)
102	{
103	PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
104	if ( (lpdbv->dbcv_flags & DBTF_MEDIA)
105	&& (pThis->Os.fUnitMask & lpdbv->dbcv_unitmask))
106	{
107	RTCritSectEnter(&pThis->CritSect);
108	if (wParam == DBT_DEVICEARRIVAL)
109	{
110	int cRetries = 10;
111	int rc = DRVHostBaseMediaPresent(pThis);
112	while (RT_FAILURE(rc) && cRetries-- > 0)
113	{
114	RTThreadSleep(50);
115	rc = DRVHostBaseMediaPresent(pThis);
116	}
117	}
118	else
119	DRVHostBaseMediaNotPresent(pThis);
120	RTCritSectLeave(&pThis->CritSect);
121	}
122	}
123	break;
124	}
125	return TRUE;
126	}
127
128
129	/**
130	* This thread will wait for changed media notificatons.
131	*
132	* @returns Ignored.
133	* @param ThreadSelf Handle of this thread. Ignored.
134	* @param pvUser Pointer to the driver instance structure.
135	*/
136	static DECLCALLBACK(int) drvHostBaseMediaThreadWin(RTTHREAD ThreadSelf, void *pvUser)
137	{
138	PDRVHOSTBASE pThis = (PDRVHOSTBASE)pvUser;
139	LogFlow(("%s-%d: drvHostBaseMediaThreadWin: ThreadSelf=%p pvUser=%p\n",
140	pThis->pDrvIns->pReg->szName, pThis->pDrvIns->iInstance, ThreadSelf, pvUser));
141	static WNDCLASS s_classDeviceChange = {0};
142	static ATOM s_hAtomDeviceChange = 0;
143
144	/*
145	* Register custom window class.
146	*/
147	if (s_hAtomDeviceChange == 0)
148	{
149	memset(&s_classDeviceChange, 0, sizeof(s_classDeviceChange));
150	s_classDeviceChange.lpfnWndProc = DeviceChangeWindowProc;
151	s_classDeviceChange.lpszClassName = "VBOX_DeviceChangeClass";
152	s_classDeviceChange.hInstance = GetModuleHandle("VBoxDD.dll");
153	Assert(s_classDeviceChange.hInstance);
154	s_hAtomDeviceChange = RegisterClassA(&s_classDeviceChange);
155	Assert(s_hAtomDeviceChange);
156	}
157
158	/*
159	* Create Window w/ the pThis as user data.
160	*/
161	HWND hwnd = CreateWindow((LPCTSTR)s_hAtomDeviceChange, "", WS_POPUP, 0, 0, 0, 0, 0, 0, s_classDeviceChange.hInstance, 0);
162	AssertMsg(hwnd, ("CreateWindow failed with %d\n", GetLastError()));
163	SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR)pThis);
164
165	/*
166	* Signal the waiting EMT thread that everything went fine.
167	*/
168	ASMAtomicXchgPtr((void * volatile *)&pThis->Os.hwndDeviceChange, hwnd);
169	RTThreadUserSignal(ThreadSelf);
170	if (!hwnd)
171	{
172	LogFlow(("%s-%d: drvHostBaseMediaThreadWin: returns VERR_GENERAL_FAILURE\n", pThis->pDrvIns->pReg->szName, pThis->pDrvIns->iInstance));
173	return VERR_GENERAL_FAILURE;
174	}
175	LogFlow(("%s-%d: drvHostBaseMediaThreadWin: Created hwndDeviceChange=%p\n", pThis->pDrvIns->pReg->szName, pThis->pDrvIns->iInstance, hwnd));
176
177	/*
178	* Message pump.
179	*/
180	MSG Msg;
181	BOOL fRet;
182	while ((fRet = GetMessage(&Msg, NULL, 0, 0)) != FALSE)
183	{
184	if (fRet != -1)
185	{
186	TranslateMessage(&Msg);
187	DispatchMessage(&Msg);
188	}
189	//else: handle the error and possibly exit
190	}
191	Assert(!pThis->Os.hwndDeviceChange);
192	/* (Don't clear the thread handle here, the destructor thread is using it to wait.) */
193	LogFlow(("%s-%d: drvHostBaseMediaThreadWin: returns VINF_SUCCESS\n", pThis->pDrvIns->pReg->szName, pThis->pDrvIns->iInstance));
194	return VINF_SUCCESS;
195	}
196
197
198	DECLHIDDEN(int) drvHostBaseScsiCmdOs(PDRVHOSTBASE pThis, const uint8_t *pbCmd, size_t cbCmd, PDMMEDIATXDIR enmTxDir,
199	void pvBuf, uint32_t pcbBuf, uint8_t *pbSense, size_t cbSense, uint32_t cTimeoutMillies)
200	{
201	/*
202	* Minimal input validation.
203	*/
204	Assert(enmTxDir == PDMMEDIATXDIR_NONE \|\| enmTxDir == PDMMEDIATXDIR_FROM_DEVICE \|\| enmTxDir == PDMMEDIATXDIR_TO_DEVICE);
205	Assert(!pvBuf \|\| pcbBuf);
206	Assert(pvBuf \|\| enmTxDir == PDMMEDIATXDIR_NONE);
207	Assert(pbSense \|\| !cbSense);
208	AssertPtr(pbCmd);
209	Assert(cbCmd <= 16 && cbCmd >= 1); RT_NOREF(cbCmd);
210
211	int rc = VERR_GENERAL_FAILURE;
212	int direction;
213	struct _REQ
214	{
215	SCSI_PASS_THROUGH_DIRECT spt;
216	uint8_t aSense[64];
217	} Req;
218	DWORD cbReturned = 0;
219
220	switch (enmTxDir)
221	{
222	case PDMMEDIATXDIR_NONE:
223	direction = SCSI_IOCTL_DATA_UNSPECIFIED;
224	break;
225	case PDMMEDIATXDIR_FROM_DEVICE:
226	Assert(*pcbBuf != 0);
227	/* Make sure that the buffer is clear for commands reading
228	* data. The actually received data may be shorter than what
229	* we expect, and due to the unreliable feedback about how much
230	* data the ioctl actually transferred, it's impossible to
231	* prevent that. Returning previous buffer contents may cause
232	* security problems inside the guest OS, if users can issue
233	* commands to the CDROM device. */
234	memset(pvBuf, '\0', *pcbBuf);
235	direction = SCSI_IOCTL_DATA_IN;
236	break;
237	case PDMMEDIATXDIR_TO_DEVICE:
238	direction = SCSI_IOCTL_DATA_OUT;
239	break;
240	default:
241	AssertMsgFailed(("enmTxDir invalid!\n"));
242	direction = SCSI_IOCTL_DATA_UNSPECIFIED;
243	}
244	memset(&Req, '\0', sizeof(Req));
245	Req.spt.Length = sizeof(Req.spt);
246	Req.spt.CdbLength = 12;
247	memcpy(Req.spt.Cdb, pbCmd, Req.spt.CdbLength);
248	Req.spt.DataBuffer = pvBuf;
249	Req.spt.DataTransferLength = *pcbBuf;
250	Req.spt.DataIn = direction;
251	Req.spt.TimeOutValue = (cTimeoutMillies + 999) / 1000; /* Convert to seconds */
252	Assert(cbSense <= sizeof(Req.aSense));
253	Req.spt.SenseInfoLength = (UCHAR)RT_MIN(sizeof(Req.aSense), cbSense);
254	Req.spt.SenseInfoOffset = RT_UOFFSETOF(struct _REQ, aSense);
255	if (DeviceIoControl((HANDLE)RTFileToNative(pThis->Os.hFileDevice), IOCTL_SCSI_PASS_THROUGH_DIRECT,
256	&Req, sizeof(Req), &Req, sizeof(Req), &cbReturned, NULL))
257	{
258	if (cbReturned > RT_UOFFSETOF(struct _REQ, aSense))
259	memcpy(pbSense, Req.aSense, cbSense);
260	else
261	memset(pbSense, '\0', cbSense);
262	/* Windows shares the property of not properly reflecting the actually
263	* transferred data size. See above. Assume that everything worked ok.
264	* Except if there are sense information. */
265	rc = (pbSense[2] & 0x0f) == SCSI_SENSE_NONE
266	? VINF_SUCCESS
267	: VERR_DEV_IO_ERROR;
268	}
269	else
270	rc = RTErrConvertFromWin32(GetLastError());
271	Log2(("%s: scsistatus=%d bytes returned=%d tlength=%d\n", __FUNCTION__, Req.spt.ScsiStatus, cbReturned, Req.spt.DataTransferLength));
272
273	return rc;
274	}
275
276
277	DECLHIDDEN(size_t) drvHostBaseScsiCmdGetBufLimitOs(PDRVHOSTBASE pThis)
278	{
279	RT_NOREF(pThis);
280
281	return WIN_SCSI_MAX_BUFFER_SIZE;
282	}
283
284
285	DECLHIDDEN(int) drvHostBaseGetMediaSizeOs(PDRVHOSTBASE pThis, uint64_t *pcb)
286	{
287	int rc = VERR_GENERAL_FAILURE;
288
289	if (PDMMEDIATYPE_IS_FLOPPY(pThis->enmType))
290	{
291	DISK_GEOMETRY geom;
292	DWORD cbBytesReturned;
293	int cbSectors;
294
295	memset(&geom, 0, sizeof(geom));
296	rc = DeviceIoControl((HANDLE)RTFileToNative(pThis->Os.hFileDevice), IOCTL_DISK_GET_DRIVE_GEOMETRY,
297	NULL, 0, &geom, sizeof(geom), &cbBytesReturned, NULL);
298	if (rc) {
299	cbSectors = geom.Cylinders.QuadPart * geom.TracksPerCylinder * geom.SectorsPerTrack;
300	pcb = cbSectors geom.BytesPerSector;
301	rc = VINF_SUCCESS;
302	}
303	else
304	{
305	DWORD dwLastError;
306
307	dwLastError = GetLastError();
308	rc = RTErrConvertFromWin32(dwLastError);
309	Log(("DrvHostFloppy: IOCTL_DISK_GET_DRIVE_GEOMETRY(%s) failed, LastError=%d rc=%Rrc\n",
310	pThis->pszDevice, dwLastError, rc));
311	return rc;
312	}
313	}
314	else
315	{
316	/* use NT api, retry a few times if the media is being verified. */
317	IO_STATUS_BLOCK IoStatusBlock = {0};
318	FILE_FS_SIZE_INFORMATION FsSize = {{0}};
319	NTSTATUS rcNt = NtQueryVolumeInformationFile((HANDLE)RTFileToNative(pThis->Os.hFileDevice), &IoStatusBlock,
320	&FsSize, sizeof(FsSize), FileFsSizeInformation);
321	int cRetries = 5;
322	while (rcNt == STATUS_VERIFY_REQUIRED && cRetries-- > 0)
323	{
324	RTThreadSleep(10);
325	rcNt = NtQueryVolumeInformationFile((HANDLE)RTFileToNative(pThis->Os.hFileDevice), &IoStatusBlock,
326	&FsSize, sizeof(FsSize), FileFsSizeInformation);
327	}
328	if (rcNt >= 0)
329	{
330	pcb = FsSize.TotalAllocationUnits.QuadPart FsSize.BytesPerSector;
331	return VINF_SUCCESS;
332	}
333
334	/* convert nt status code to VBox status code. */
335	/** @todo Make conversion function!. */
336	switch (rcNt)
337	{
338	case STATUS_NO_MEDIA_IN_DEVICE: rc = VERR_MEDIA_NOT_PRESENT; break;
339	case STATUS_VERIFY_REQUIRED: rc = VERR_TRY_AGAIN; break;
340	}
341	LogFlow(("drvHostBaseGetMediaSize: NtQueryVolumeInformationFile -> %#lx\n", rcNt, rc));
342	}
343	return rc;
344	}
345
346
347	DECLHIDDEN(int) drvHostBaseReadOs(PDRVHOSTBASE pThis, uint64_t off, void *pvBuf, size_t cbRead)
348	{
349	return RTFileReadAt(pThis->Os.hFileDevice, off, pvBuf, cbRead, NULL);
350	}
351
352
353	DECLHIDDEN(int) drvHostBaseWriteOs(PDRVHOSTBASE pThis, uint64_t off, const void *pvBuf, size_t cbWrite)
354	{
355	return RTFileWriteAt(pThis->Os.hFileDevice, off, pvBuf, cbWrite, NULL);
356	}
357
358
359	DECLHIDDEN(int) drvHostBaseFlushOs(PDRVHOSTBASE pThis)
360	{
361	return RTFileFlush(pThis->Os.hFileDevice);
362	}
363
364
365	DECLHIDDEN(int) drvHostBaseDoLockOs(PDRVHOSTBASE pThis, bool fLock)
366	{
367	PREVENT_MEDIA_REMOVAL PreventMediaRemoval = {fLock};
368	DWORD cbReturned;
369	int rc;
370	if (DeviceIoControl((HANDLE)RTFileToNative(pThis->Os.hFileDevice), IOCTL_STORAGE_MEDIA_REMOVAL,
371	&PreventMediaRemoval, sizeof(PreventMediaRemoval),
372	NULL, 0, &cbReturned,
373	NULL))
374	rc = VINF_SUCCESS;
375	else
376	/** @todo figure out the return codes for already locked. */
377	rc = RTErrConvertFromWin32(GetLastError());
378
379	return rc;
380	}
381
382
383	DECLHIDDEN(int) drvHostBaseEjectOs(PDRVHOSTBASE pThis)
384	{
385	int rc = VINF_SUCCESS;
386	RTFILE hFileDevice = pThis->Os.hFileDevice;
387	if (hFileDevice == NIL_RTFILE) /* obsolete crap */
388	rc = RTFileOpen(&hFileDevice, pThis->pszDeviceOpen, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
389	if (RT_SUCCESS(rc))
390	{
391	/* do ioctl */
392	DWORD cbReturned;
393	if (DeviceIoControl((HANDLE)RTFileToNative(hFileDevice), IOCTL_STORAGE_EJECT_MEDIA,
394	NULL, 0,
395	NULL, 0, &cbReturned,
396	NULL))
397	rc = VINF_SUCCESS;
398	else
399	rc = RTErrConvertFromWin32(GetLastError());
400
401	/* clean up handle */
402	if (hFileDevice != pThis->Os.hFileDevice)
403	RTFileClose(hFileDevice);
404	}
405	else
406	AssertMsgFailed(("Failed to open '%s' for ejecting this tray.\n", rc));
407
408	return rc;
409	}
410
411
412	DECLHIDDEN(void) drvHostBaseInitOs(PDRVHOSTBASE pThis)
413	{
414	pThis->Os.hFileDevice = NIL_RTFILE;
415	pThis->Os.hwndDeviceChange = NULL;
416	pThis->Os.hThrdMediaChange = NIL_RTTHREAD;
417	}
418
419
420	DECLHIDDEN(int) drvHostBaseOpenOs(PDRVHOSTBASE pThis, bool fReadOnly)
421	{
422	UINT uDriveType = GetDriveType(pThis->pszDevice);
423	switch (pThis->enmType)
424	{
425	case PDMMEDIATYPE_FLOPPY_360:
426	case PDMMEDIATYPE_FLOPPY_720:
427	case PDMMEDIATYPE_FLOPPY_1_20:
428	case PDMMEDIATYPE_FLOPPY_1_44:
429	case PDMMEDIATYPE_FLOPPY_2_88:
430	case PDMMEDIATYPE_FLOPPY_FAKE_15_6:
431	case PDMMEDIATYPE_FLOPPY_FAKE_63_5:
432	if (uDriveType != DRIVE_REMOVABLE)
433	{
434	AssertMsgFailed(("Configuration error: '%s' is not a floppy (type=%d)\n",
435	pThis->pszDevice, uDriveType));
436	return VERR_INVALID_PARAMETER;
437	}
438	break;
439	case PDMMEDIATYPE_CDROM:
440	case PDMMEDIATYPE_DVD:
441	if (uDriveType != DRIVE_CDROM)
442	{
443	AssertMsgFailed(("Configuration error: '%s' is not a cdrom (type=%d)\n",
444	pThis->pszDevice, uDriveType));
445	return VERR_INVALID_PARAMETER;
446	}
447	break;
448	case PDMMEDIATYPE_HARD_DISK:
449	default:
450	AssertMsgFailed(("enmType=%d\n", pThis->enmType));
451	return VERR_INVALID_PARAMETER;
452	}
453
454	int iBit = RT_C_TO_UPPER(pThis->pszDevice[0]) - 'A';
455	if ( iBit > 'Z' - 'A'
456	\|\| pThis->pszDevice[1] != ':'
457	\|\| pThis->pszDevice[2])
458	{
459	AssertMsgFailed(("Configuration error: Invalid drive specification: '%s'\n", pThis->pszDevice));
460	return VERR_INVALID_PARAMETER;
461	}
462	pThis->Os.fUnitMask = 1 << iBit;
463	RTStrAPrintf(&pThis->pszDeviceOpen, "\\\\.\\%s", pThis->pszDevice);
464	if (!pThis->pszDeviceOpen)
465	return VERR_NO_MEMORY;
466
467	uint32_t fFlags = (fReadOnly ? RTFILE_O_READ : RTFILE_O_READWRITE) \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE;
468	int rc = RTFileOpen(&pThis->Os.hFileDevice, pThis->pszDeviceOpen, fFlags);
469
470	if (RT_SUCCESS(rc))
471	{
472	/*
473	* Start the thread which will wait for the media change events.
474	*/
475	rc = RTThreadCreate(&pThis->Os.hThrdMediaChange, drvHostBaseMediaThreadWin, pThis, 0,
476	RTTHREADTYPE_INFREQUENT_POLLER, RTTHREADFLAGS_WAITABLE, "DVDMEDIA");
477	if (RT_FAILURE(rc))
478	{
479	AssertMsgFailed(("Failed to create poller thread. rc=%Rrc\n", rc));
480	return rc;
481	}
482
483	/*
484	* Wait for the thread to start up (!w32:) and do one detection loop.
485	*/
486	rc = RTThreadUserWait(pThis->Os.hThrdMediaChange, 10000);
487	AssertRC(rc);
488
489	if (!pThis->Os.hwndDeviceChange)
490	return VERR_GENERAL_FAILURE;
491
492	DRVHostBaseMediaPresent(pThis);
493	}
494
495	return rc;
496	}
497
498
499	DECLHIDDEN(int) drvHostBaseMediaRefreshOs(PDRVHOSTBASE pThis)
500	{
501	RT_NOREF(pThis);
502	return VINF_SUCCESS;
503	}
504
505
506	DECLHIDDEN(int) drvHostBaseQueryMediaStatusOs(PDRVHOSTBASE pThis, bool pfMediaChanged, bool pfMediaPresent)
507	{
508	RT_NOREF3(pThis, pfMediaChanged, pfMediaPresent); /* We don't support the polling method. */
509	return VERR_NOT_SUPPORTED;
510	}
511
512
513	DECLHIDDEN(bool) drvHostBaseIsMediaPollingRequiredOs(PDRVHOSTBASE pThis)
514	{
515	/* For Windows we alwys use an internal approach. */
516	RT_NOREF(pThis);
517	return false;
518	}
519
520
521	DECLHIDDEN(void) drvHostBaseDestructOs(PDRVHOSTBASE pThis)
522	{
523	/*
524	* Terminate the thread.
525	*/
526	if (pThis->Os.hThrdMediaChange != NIL_RTTHREAD)
527	{
528	int rc;
529	int cTimes = 50;
530	do
531	{
532	if (pThis->Os.hwndDeviceChange)
533	PostMessage(pThis->Os.hwndDeviceChange, WM_CLOSE, 0, 0); /* default win proc will destroy the window */
534
535	rc = RTThreadWait(pThis->Os.hThrdMediaChange, 100, NULL);
536	} while (cTimes-- > 0 && rc == VERR_TIMEOUT);
537
538	if (RT_SUCCESS(rc))
539	pThis->Os.hThrdMediaChange = NIL_RTTHREAD;
540	}
541
542	/*
543	* Unlock the drive if we've locked it or we're in passthru mode.
544	*/
545	if ( pThis->fLocked
546	&& pThis->Os.hFileDevice != NIL_RTFILE
547	&& pThis->pfnDoLock)
548	{
549	int rc = pThis->pfnDoLock(pThis, false);
550	if (RT_SUCCESS(rc))
551	pThis->fLocked = false;
552	}
553
554	if (pThis->Os.hwndDeviceChange)
555	{
556	if (SetWindowLongPtr(pThis->Os.hwndDeviceChange, GWLP_USERDATA, 0) == (LONG_PTR)pThis)
557	PostMessage(pThis->Os.hwndDeviceChange, WM_CLOSE, 0, 0); /* default win proc will destroy the window */
558	pThis->Os.hwndDeviceChange = NULL;
559	}
560
561	if (pThis->Os.hFileDevice != NIL_RTFILE)
562	{
563	int rc = RTFileClose(pThis->Os.hFileDevice);
564	AssertRC(rc);
565	pThis->Os.hFileDevice = NIL_RTFILE;
566	}
567	}
568

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source: vbox/trunk/src/VBox/Devices/Storage/DrvHostBase-win.cpp@ 100766

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