dlls/winmm/driver.c

   1 /* -*- tab-width: 8; c-basic-offset: 4 -*- */
   2
   3 /*
   4  * WINE Drivers functions
   5  *
   6  * Copyright 1994 Martin Ayotte
   7  * Copyright 1998 Marcus Meissner
   8  * Copyright 1999 Eric Pouech
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include <string.h>
  26 #include <stdarg.h>
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "wingdi.h"
  30 #include "winuser.h"
  31 #include "winnls.h"
  32 #include "mmddk.h"
  33 #include "winemm.h"
  34 #include "wine/debug.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(driver);
  37
  38 static LPWINE_DRIVER   lpDrvItemList  /* = NULL */;
  39
  40 WINE_MMTHREAD*  (*pFnGetMMThread16)(UINT16 h) /* = NULL */;
  41 LPWINE_DRIVER   (*pFnOpenDriver16)(LPCSTR,LPCSTR,LPARAM) /* = NULL */;
  42 LRESULT         (*pFnCloseDriver16)(UINT16,LPARAM,LPARAM) /* = NULL */;
  43 LRESULT         (*pFnSendMessage16)(UINT16,UINT,LPARAM,LPARAM) /* = NULL */;
  44
  45 /**************************************************************************
  46  *                      DRIVER_GetNumberOfModuleRefs            [internal]
  47  *
  48  * Returns the number of open drivers which share the same module.
  49  */
  50 static  unsigned DRIVER_GetNumberOfModuleRefs(HMODULE hModule, WINE_DRIVER** found)
  51 {
  52     LPWINE_DRIVER       lpDrv;
  53     unsigned            count = 0;
  54
  55     if (found) *found = NULL;
  56     for (lpDrv = lpDrvItemList; lpDrv; lpDrv = lpDrv->lpNextItem)
  57     {
  58         if (!(lpDrv->dwFlags & WINE_GDF_16BIT) && lpDrv->d.d32.hModule == hModule)
  59         {
  60             if (found && !*found) *found = lpDrv;
  61             count++;
  62         }
  63     }
  64     return count;
  65 }
  66
  67 /**************************************************************************
  68  *                              DRIVER_FindFromHDrvr            [internal]
  69  *
  70  * From a hDrvr being 32 bits, returns the WINE internal structure.
  71  */
  72 LPWINE_DRIVER   DRIVER_FindFromHDrvr(HDRVR hDrvr)
  73 {
  74     LPWINE_DRIVER       d = (LPWINE_DRIVER)hDrvr;
  75
  76     if (hDrvr && HeapValidate(GetProcessHeap(), 0, d) && d->dwMagic == WINE_DI_MAGIC) {
  77         return d;
  78     }
  79     return NULL;
  80 }
  81
  82 /**************************************************************************
  83  *                              DRIVER_SendMessage              [internal]
  84  */
  85 static LRESULT inline DRIVER_SendMessage(LPWINE_DRIVER lpDrv, UINT msg,
  86                                          LPARAM lParam1, LPARAM lParam2)
  87 {
  88     LRESULT             ret = 0;
  89
  90     if (lpDrv->dwFlags & WINE_GDF_16BIT) {
  91         /* no need to check mmsystem presence: the driver must have been opened as a 16 bit one,
  92          */
  93         if (pFnSendMessage16)
  94             ret = pFnSendMessage16(lpDrv->d.d16.hDriver16, msg, lParam1, lParam2);
  95     } else {
  96         TRACE("Before call32 proc=%p drvrID=%08lx hDrv=%p wMsg=%04x p1=%08lx p2=%08lx\n",
  97               lpDrv->d.d32.lpDrvProc, lpDrv->d.d32.dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2);
  98         ret = lpDrv->d.d32.lpDrvProc(lpDrv->d.d32.dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2);
  99         TRACE("After  call32 proc=%p drvrID=%08lx hDrv=%p wMsg=%04x p1=%08lx p2=%08lx => %08lx\n",
 100               lpDrv->d.d32.lpDrvProc, lpDrv->d.d32.dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2, ret);
 101     }
 102     return ret;
 103 }
 104
 105 /**************************************************************************
 106  *                              SendDriverMessage               [WINMM.@]
 107  *                              DrvSendMessage                  [WINMM.@]
 108  */
 109 LRESULT WINAPI SendDriverMessage(HDRVR hDriver, UINT msg, LPARAM lParam1,
 110                                  LPARAM lParam2)
 111 {
 112     LPWINE_DRIVER       lpDrv;
 113     LRESULT             retval = 0;
 114
 115     TRACE("(%p, %04X, %08lX, %08lX)\n", hDriver, msg, lParam1, lParam2);
 116
 117     if ((lpDrv = DRIVER_FindFromHDrvr(hDriver)) != NULL) {
 118         retval = DRIVER_SendMessage(lpDrv, msg, lParam1, lParam2);
 119     } else {
 120         WARN("Bad driver handle %p\n", hDriver);
 121     }
 122     TRACE("retval = %ld\n", retval);
 123
 124     return retval;
 125 }
 126
 127 /**************************************************************************
 128  *                              DRIVER_RemoveFromList           [internal]
 129  *
 130  * Generates all the logic to handle driver closure / deletion
 131  * Removes a driver struct to the list of open drivers.
 132  */
 133 static  BOOL    DRIVER_RemoveFromList(LPWINE_DRIVER lpDrv)
 134 {
 135     if (!(lpDrv->dwFlags & WINE_GDF_16BIT)) {
 136         /* last of this driver in list ? */
 137         if (DRIVER_GetNumberOfModuleRefs(lpDrv->d.d32.hModule, NULL) == 1) {
 138             DRIVER_SendMessage(lpDrv, DRV_DISABLE, 0L, 0L);
 139             DRIVER_SendMessage(lpDrv, DRV_FREE,    0L, 0L);
 140         }
 141     }
 142
 143     if (lpDrv->lpPrevItem)
 144         lpDrv->lpPrevItem->lpNextItem = lpDrv->lpNextItem;
 145     else
 146         lpDrvItemList = lpDrv->lpNextItem;
 147     if (lpDrv->lpNextItem)
 148         lpDrv->lpNextItem->lpPrevItem = lpDrv->lpPrevItem;
 149     /* trash magic number */
 150     lpDrv->dwMagic ^= 0xa5a5a5a5;
 151
 152     return TRUE;
 153 }
 154
 155 /**************************************************************************
 156  *                              DRIVER_AddToList                [internal]
 157  *
 158  * Adds a driver struct to the list of open drivers.
 159  * Generates all the logic to handle driver creation / open.
 160  */
 161 static  BOOL    DRIVER_AddToList(LPWINE_DRIVER lpNewDrv, LPARAM lParam1, LPARAM lParam2)
 162 {
 163     lpNewDrv->dwMagic = WINE_DI_MAGIC;
 164     /* First driver to be loaded for this module, need to load correctly the module */
 165     if (!(lpNewDrv->dwFlags & WINE_GDF_16BIT)) {
 166         /* first of this driver in list ? */
 167         if (DRIVER_GetNumberOfModuleRefs(lpNewDrv->d.d32.hModule, NULL) == 0) {
 168             if (DRIVER_SendMessage(lpNewDrv, DRV_LOAD, 0L, 0L) != DRV_SUCCESS) {
 169                 TRACE("DRV_LOAD failed on driver 0x%08lx\n", (DWORD)lpNewDrv);
 170                 return FALSE;
 171             }
 172             /* returned value is not checked */
 173             DRIVER_SendMessage(lpNewDrv, DRV_ENABLE, 0L, 0L);
 174         }
 175     }
 176
 177     lpNewDrv->lpNextItem = NULL;
 178     if (lpDrvItemList == NULL) {
 179         lpDrvItemList = lpNewDrv;
 180         lpNewDrv->lpPrevItem = NULL;
 181     } else {
 182         LPWINE_DRIVER   lpDrv = lpDrvItemList;  /* find end of list */
 183         while (lpDrv->lpNextItem != NULL)
 184             lpDrv = lpDrv->lpNextItem;
 185
 186         lpDrv->lpNextItem = lpNewDrv;
 187         lpNewDrv->lpPrevItem = lpDrv;
 188     }
 189
 190     if (!(lpNewDrv->dwFlags & WINE_GDF_16BIT)) {
 191         /* Now just open a new instance of a driver on this module */
 192         lpNewDrv->d.d32.dwDriverID = DRIVER_SendMessage(lpNewDrv, DRV_OPEN, lParam1, lParam2);
 193
 194         if (lpNewDrv->d.d32.dwDriverID == 0) {
 195             TRACE("DRV_OPEN failed on driver 0x%08lx\n", (DWORD)lpNewDrv);
 196             DRIVER_RemoveFromList(lpNewDrv);
 197             return FALSE;
 198         }
 199     }
 200     return TRUE;
 201 }
 202
 203 /**************************************************************************
 204  *                              DRIVER_GetLibName               [internal]
 205  *
 206  */
 207 BOOL    DRIVER_GetLibName(LPCSTR keyName, LPCSTR sectName, LPSTR buf, int sz)
 208 {
 209     /* should also do some registry diving */
 210     return GetPrivateProfileStringA(sectName, keyName, "", buf, sz, "SYSTEM.INI");
 211 }
 212
 213 /**************************************************************************
 214  *                              DRIVER_TryOpenDriver32          [internal]
 215  *
 216  * Tries to load a 32 bit driver whose DLL's (module) name is fn
 217  */
 218 LPWINE_DRIVER   DRIVER_TryOpenDriver32(LPCSTR fn, LPARAM lParam2)
 219 {
 220     LPWINE_DRIVER       lpDrv = NULL;
 221     HMODULE             hModule = 0;
 222     LPSTR               ptr;
 223     LPCSTR              cause = 0;
 224
 225     TRACE("(%s, %08lX);\n", debugstr_a(fn), lParam2);
 226
 227     if ((ptr = strchr(fn, ' ')) != NULL) {
 228         *ptr++ = '\0';
 229         while (*ptr == ' ') ptr++;
 230         if (*ptr == '\0') ptr = NULL;
 231     }
 232
 233     lpDrv = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_DRIVER));
 234     if (lpDrv == NULL) {cause = "OOM"; goto exit;}
 235
 236     if ((hModule = LoadLibraryA(fn)) == 0) {cause = "Not a 32 bit lib"; goto exit;}
 237
 238     lpDrv->d.d32.lpDrvProc = (DRIVERPROC)GetProcAddress(hModule, "DriverProc");
 239     if (lpDrv->d.d32.lpDrvProc == NULL) {cause = "no DriverProc"; goto exit;}
 240
 241     lpDrv->dwFlags          = 0;
 242     lpDrv->d.d32.hModule    = hModule;
 243     lpDrv->d.d32.dwDriverID = 0;
 244
 245     /* Win32 installable drivers must support a two phase opening scheme:
 246      * + first open with NULL as lParam2 (session instance),
 247      * + then do a second open with the real non null lParam2)
 248      */
 249     if (DRIVER_GetNumberOfModuleRefs(lpDrv->d.d32.hModule, NULL) == 0 && lParam2)
 250     {
 251         LPWINE_DRIVER   ret;
 252
 253         if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, 0L))
 254         {
 255             cause = "load0 failed";
 256             goto exit;
 257         }
 258         ret = DRIVER_TryOpenDriver32(fn, lParam2);
 259         if (!ret)
 260         {
 261             CloseDriver((HDRVR)lpDrv, 0L, 0L);
 262             cause = "load1 failed";
 263             goto exit;
 264         }
 265         return ret;
 266     }
 267
 268     if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, lParam2))
 269     {cause = "load failed"; goto exit;}
 270
 271     TRACE("=> %p\n", lpDrv);
 272     return lpDrv;
 273  exit:
 274     FreeLibrary(hModule);
 275     HeapFree(GetProcessHeap(), 0, lpDrv);
 276     TRACE("Unable to load 32 bit module %s: %s\n", debugstr_a(fn), cause);
 277     return NULL;
 278 }
 279
 280 /**************************************************************************
 281  *                              OpenDriverA                     [WINMM.@]
 282  *                              DrvOpenA                        [WINMM.@]
 283  * (0,1,DRV_LOAD  ,0       ,0)
 284  * (0,1,DRV_ENABLE,0       ,0)
 285  * (0,1,DRV_OPEN  ,buf[256],0)
 286  */
 287 HDRVR WINAPI OpenDriverA(LPCSTR lpDriverName, LPCSTR lpSectionName, LPARAM lParam2)
 288 {
 289     LPWINE_DRIVER       lpDrv = NULL;
 290     char                libName[128];
 291     LPCSTR              lsn = lpSectionName;
 292
 293     TRACE("(%s, %s, 0x%08lx);\n", debugstr_a(lpDriverName), debugstr_a(lpSectionName), lParam2);
 294
 295     if (lsn == NULL) {
 296         lstrcpynA(libName, lpDriverName, sizeof(libName));
 297
 298         if ((lpDrv = DRIVER_TryOpenDriver32(libName, lParam2)))
 299             goto the_end;
 300         lsn = "Drivers32";
 301     }
 302     if (DRIVER_GetLibName(lpDriverName, lsn, libName, sizeof(libName)) &&
 303         (lpDrv = DRIVER_TryOpenDriver32(libName, lParam2)))
 304         goto the_end;
 305
 306     /* now we will try a 16 bit driver (and add all the glue to make it work... which
 307      * is located in our mmsystem implementation)
 308      * so ensure, we can load our mmsystem, otherwise just fail
 309      */
 310     WINMM_CheckForMMSystem();
 311     if (pFnOpenDriver16 &&
 312         (lpDrv = pFnOpenDriver16(lpDriverName, lpSectionName, lParam2)))
 313     {
 314         if (DRIVER_AddToList(lpDrv, 0, lParam2)) goto the_end;
 315         HeapFree(GetProcessHeap(), 0, lpDrv);
 316     }
 317     TRACE("Failed to open driver %s from system.ini file, section %s\n", debugstr_a(lpDriverName), debugstr_a(lpSectionName));
 318     return 0;
 319
 320  the_end:
 321     if (lpDrv)  TRACE("=> %08lx\n", (DWORD)lpDrv);
 322     return (HDRVR)lpDrv;
 323 }
 324
 325 /**************************************************************************
 326  *                              OpenDriver                      [WINMM.@]
 327  *                              DrvOpen                         [WINMM.@]
 328  */
 329 HDRVR WINAPI OpenDriverW(LPCWSTR lpDriverName, LPCWSTR lpSectionName, LPARAM lParam)
 330 {
 331     INT                 len;
 332     LPSTR               dn = NULL;
 333     LPSTR               sn = NULL;
 334     HDRVR               ret;
 335
 336     if (lpDriverName)
 337     {
 338         len = WideCharToMultiByte( CP_ACP, 0, lpDriverName, -1, NULL, 0, NULL, NULL );
 339         dn = HeapAlloc( GetProcessHeap(), 0, len );
 340         if (!dn) return 0;
 341         WideCharToMultiByte( CP_ACP, 0, lpDriverName, -1, dn, len, NULL, NULL );
 342     }
 343
 344     if (lpSectionName)
 345     {
 346         len = WideCharToMultiByte( CP_ACP, 0, lpSectionName, -1, NULL, 0, NULL, NULL );
 347         sn = HeapAlloc( GetProcessHeap(), 0, len );
 348         if (!sn) return 0;
 349         WideCharToMultiByte( CP_ACP, 0, lpSectionName, -1, sn, len, NULL, NULL );
 350     }
 351
 352     ret = OpenDriverA(dn, sn, lParam);
 353
 354     if (dn) HeapFree(GetProcessHeap(), 0, dn);
 355     if (sn) HeapFree(GetProcessHeap(), 0, sn);
 356     return ret;
 357 }
 358
 359 /**************************************************************************
 360  *                      CloseDriver                             [WINMM.@]
 361  *                      DrvClose                                [WINMM.@]
 362  */
 363 LRESULT WINAPI CloseDriver(HDRVR hDrvr, LPARAM lParam1, LPARAM lParam2)
 364 {
 365     LPWINE_DRIVER       lpDrv;
 366
 367     TRACE("(%p, %08lX, %08lX);\n", hDrvr, lParam1, lParam2);
 368
 369     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL)
 370     {
 371         if (lpDrv->dwFlags & WINE_GDF_16BIT)
 372         {
 373             if (pFnCloseDriver16)
 374                 pFnCloseDriver16(lpDrv->d.d16.hDriver16, lParam1, lParam2);
 375         }
 376         else
 377         {
 378             DRIVER_SendMessage(lpDrv, DRV_CLOSE, lParam1, lParam2);
 379             lpDrv->d.d32.dwDriverID = 0;
 380         }
 381         if (DRIVER_RemoveFromList(lpDrv)) {
 382             if (!(lpDrv->dwFlags & WINE_GDF_16BIT))
 383             {
 384                 LPWINE_DRIVER       lpDrv0;
 385
 386                 /* if driver has an opened session instance, we have to close it too */
 387                 if (DRIVER_GetNumberOfModuleRefs(lpDrv->d.d32.hModule, &lpDrv0) == 1)
 388                 {
 389                     DRIVER_SendMessage(lpDrv0, DRV_CLOSE, 0L, 0L);
 390                     lpDrv0->d.d32.dwDriverID = 0;
 391                     DRIVER_RemoveFromList(lpDrv0);
 392                     FreeLibrary(lpDrv0->d.d32.hModule);
 393                     HeapFree(GetProcessHeap(), 0, lpDrv0);
 394                 }
 395                 FreeLibrary(lpDrv->d.d32.hModule);
 396             }
 397             HeapFree(GetProcessHeap(), 0, lpDrv);
 398             return TRUE;
 399         }
 400     }
 401     WARN("Failed to close driver\n");
 402     return FALSE;
 403 }
 404
 405 /**************************************************************************
 406  *                              GetDriverFlags          [WINMM.@]
 407  * [in] hDrvr handle to the driver
 408  *
 409  * Returns:
 410  *      0x00000000 if hDrvr is an invalid handle
 411  *      0x80000000 if hDrvr is a valid 32 bit driver
 412  *      0x90000000 if hDrvr is a valid 16 bit driver
 413  *
 414  * native WINMM doesn't return those flags
 415  *      0x80000000 for a valid 32 bit driver and that's it
 416  *      (I may have mixed up the two flags :-(
 417  */
 418 DWORD   WINAPI GetDriverFlags(HDRVR hDrvr)
 419 {
 420     LPWINE_DRIVER       lpDrv;
 421     DWORD               ret = 0;
 422
 423     TRACE("(%p)\n", hDrvr);
 424
 425     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
 426         ret = WINE_GDF_EXIST | lpDrv->dwFlags;
 427     }
 428     return ret;
 429 }
 430
 431 /**************************************************************************
 432  *                              GetDriverModuleHandle   [WINMM.@]
 433  *                              DrvGetModuleHandle      [WINMM.@]
 434  */
 435 HMODULE WINAPI GetDriverModuleHandle(HDRVR hDrvr)
 436 {
 437     LPWINE_DRIVER       lpDrv;
 438     HMODULE             hModule = 0;
 439
 440     TRACE("(%p);\n", hDrvr);
 441
 442     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
 443         if (!(lpDrv->dwFlags & WINE_GDF_16BIT))
 444             hModule = lpDrv->d.d32.hModule;
 445     }
 446     TRACE("=> %p\n", hModule);
 447     return hModule;
 448 }
 449
 450 /**************************************************************************
 451  *                              DefDriverProc                     [WINMM.@]
 452  *                              DrvDefDriverProc                  [WINMM.@]
 453  */
 454 LRESULT WINAPI DefDriverProc(DWORD dwDriverIdentifier, HDRVR hDrv,
 455                              UINT Msg, LPARAM lParam1, LPARAM lParam2)
 456 {
 457     switch (Msg) {
 458     case DRV_LOAD:
 459     case DRV_FREE:
 460     case DRV_ENABLE:
 461     case DRV_DISABLE:
 462         return 1;
 463     case DRV_INSTALL:
 464     case DRV_REMOVE:
 465         return DRV_SUCCESS;
 466     default:
 467         return 0;
 468     }
 469 }
 470
 471 /**************************************************************************
 472  *                              DriverCallback                  [WINMM.@]
 473  */
 474 BOOL WINAPI DriverCallback(DWORD dwCallBack, UINT uFlags, HDRVR hDev,
 475                            UINT wMsg, DWORD dwUser, DWORD dwParam1,
 476                            DWORD dwParam2)
 477 {
 478     TRACE("(%08lX, %04X, %p, %04X, %08lX, %08lX, %08lX); !\n",
 479           dwCallBack, uFlags, hDev, wMsg, dwUser, dwParam1, dwParam2);
 480
 481     switch (uFlags & DCB_TYPEMASK) {
 482     case DCB_NULL:
 483         TRACE("Null !\n");
 484         if (dwCallBack)
 485             WARN("uFlags=%04X has null DCB value, but dwCallBack=%08lX is not null !\n", uFlags, dwCallBack);
 486         break;
 487     case DCB_WINDOW:
 488         TRACE("Window(%04lX) handle=%p!\n", dwCallBack, hDev);
 489         PostMessageA((HWND)dwCallBack, wMsg, (WPARAM)hDev, dwParam1);
 490         break;
 491     case DCB_TASK: /* aka DCB_THREAD */
 492         TRACE("Task(%04lx) !\n", dwCallBack);
 493         PostThreadMessageA(dwCallBack, wMsg, (WPARAM)hDev, dwParam1);
 494         break;
 495     case DCB_FUNCTION:
 496         TRACE("Function (32 bit) !\n");
 497         ((LPDRVCALLBACK)dwCallBack)(hDev, wMsg, dwUser, dwParam1, dwParam2);
 498         break;
 499     case DCB_EVENT:
 500         TRACE("Event(%08lx) !\n", dwCallBack);
 501         SetEvent((HANDLE)dwCallBack);
 502         break;
 503     case 6: /* I would dub it DCB_MMTHREADSIGNAL */
 504         /* this is an undocumented DCB_ value used for mmThreads
 505          * loword of dwCallBack contains the handle of the lpMMThd block
 506          * which dwSignalCount has to be incremented
 507          */
 508         if (pFnGetMMThread16)
 509         {
 510             WINE_MMTHREAD*      lpMMThd = pFnGetMMThread16(LOWORD(dwCallBack));
 511
 512             TRACE("mmThread (%04x, %p) !\n", LOWORD(dwCallBack), lpMMThd);
 513             /* same as mmThreadSignal16 */
 514             InterlockedIncrement(&lpMMThd->dwSignalCount);
 515             SetEvent(lpMMThd->hEvent);
 516             /* some other stuff on lpMMThd->hVxD */
 517         }
 518         break;
 519 #if 0
 520     case 4:
 521         /* this is an undocumented DCB_ value for... I don't know */
 522         break;
 523 #endif
 524     default:
 525         WARN("Unknown callback type %d\n", uFlags & DCB_TYPEMASK);
 526         return FALSE;
 527     }
 528     TRACE("Done\n");
 529     return TRUE;
 530 }
 531
 532 /******************************************************************
 533  *              DRIVER_UnloadAll
 534  *
 535  *
 536  */
 537 void    DRIVER_UnloadAll(void)
 538 {
 539     LPWINE_DRIVER       lpDrv;
 540     LPWINE_DRIVER       lpNextDrv = NULL;
 541     unsigned            count = 0;
 542
 543     for (lpDrv = lpDrvItemList; lpDrv != NULL; lpDrv = lpNextDrv)
 544     {
 545         lpNextDrv = lpDrv->lpNextItem;
 546         CloseDriver((HDRVR)lpDrv, 0, 0);
 547         count++;
 548     }
 549     TRACE("Unloaded %u drivers\n", count);
 550 }