reactos/dll/winmm/driver.c

   1 /*
   2  * WINE Drivers functions
   3  *
   4  * Copyright 1994 Martin Ayotte
   5  * Copyright 1998 Marcus Meissner
   6  * Copyright 1999 Eric Pouech
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <string.h>
  24 #include <stdarg.h>
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "wingdi.h"
  28 #include "winuser.h"
  29 #include "winnls.h"
  30 #include "winreg.h"
  31 #include "mmddk.h"
  32 #include "winemm.h"
  33 #include "wine/debug.h"
  34 #include "wine/unicode.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(driver);
  37
  38 static LPWINE_DRIVER   lpDrvItemList  /* = NULL */;
  39 static const WCHAR HKLM_BASE[] = {'S','o','f','t','w','a','r','e','\\','M','i','c','r','o','s','o','f','t','\\',
  40                                   'W','i','n','d','o','w','s',' ','N','T','\\','C','u','r','r','e','n','t','V','e','r','s','i','o','n',0};
  41
  42 WINE_MMTHREAD*  (*pFnGetMMThread16)(UINT16 h) /* = NULL */;
  43 LPWINE_DRIVER   (*pFnOpenDriver16)(LPCWSTR,LPCWSTR,LPARAM) /* = NULL */;
  44 LRESULT         (*pFnCloseDriver16)(UINT16,LPARAM,LPARAM) /* = NULL */;
  45 LRESULT         (*pFnSendMessage16)(UINT16,UINT,LPARAM,LPARAM) /* = NULL */;
  46
  47 /**************************************************************************
  48  *                      DRIVER_GetNumberOfModuleRefs            [internal]
  49  *
  50  * Returns the number of open drivers which share the same module.
  51  */
  52 static  unsigned DRIVER_GetNumberOfModuleRefs(HMODULE hModule, WINE_DRIVER** found)
  53 {
  54     LPWINE_DRIVER       lpDrv;
  55     unsigned            count = 0;
  56
  57     if (found) *found = NULL;
  58     for (lpDrv = lpDrvItemList; lpDrv; lpDrv = lpDrv->lpNextItem)
  59     {
  60         if (!(lpDrv->dwFlags & WINE_GDF_16BIT) && lpDrv->d.d32.hModule == hModule)
  61         {
  62             if (found && !*found) *found = lpDrv;
  63             count++;
  64         }
  65     }
  66     return count;
  67 }
  68
  69 /**************************************************************************
  70  *                              DRIVER_FindFromHDrvr            [internal]
  71  *
  72  * From a hDrvr being 32 bits, returns the WINE internal structure.
  73  */
  74 LPWINE_DRIVER   DRIVER_FindFromHDrvr(HDRVR hDrvr)
  75 {
  76     LPWINE_DRIVER       d = (LPWINE_DRIVER)hDrvr;
  77
  78     if (hDrvr && HeapValidate(GetProcessHeap(), 0, d) && d->dwMagic == WINE_DI_MAGIC) {
  79         return d;
  80     }
  81     return NULL;
  82 }
  83
  84 /**************************************************************************
  85  *                              DRIVER_SendMessage              [internal]
  86  */
  87 static LRESULT inline DRIVER_SendMessage(LPWINE_DRIVER lpDrv, UINT msg,
  88                                          LPARAM lParam1, LPARAM lParam2)
  89 {
  90     LRESULT             ret = 0;
  91
  92     if (lpDrv->dwFlags & WINE_GDF_16BIT) {
  93         /* no need to check mmsystem presence: the driver must have been opened as a 16 bit one,
  94          */
  95         if (pFnSendMessage16)
  96             ret = pFnSendMessage16(lpDrv->d.d16.hDriver16, msg, lParam1, lParam2);
  97     } else {
  98         TRACE("Before call32 proc=%p drvrID=%08lx hDrv=%p wMsg=%04x p1=%08lx p2=%08lx\n",
  99               lpDrv->d.d32.lpDrvProc, lpDrv->d.d32.dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2);
 100         ret = lpDrv->d.d32.lpDrvProc(lpDrv->d.d32.dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2);
 101         TRACE("After  call32 proc=%p drvrID=%08lx hDrv=%p wMsg=%04x p1=%08lx p2=%08lx => %08lx\n",
 102               lpDrv->d.d32.lpDrvProc, lpDrv->d.d32.dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2, ret);
 103     }
 104     return ret;
 105 }
 106
 107 /**************************************************************************
 108  *                              SendDriverMessage               [WINMM.@]
 109  *                              DrvSendMessage                  [WINMM.@]
 110  */
 111 LRESULT WINAPI SendDriverMessage(HDRVR hDriver, UINT msg, LPARAM lParam1,
 112                                  LPARAM lParam2)
 113 {
 114     LPWINE_DRIVER       lpDrv;
 115     LRESULT             retval = 0;
 116
 117     TRACE("(%p, %04X, %08lX, %08lX)\n", hDriver, msg, lParam1, lParam2);
 118
 119     if ((lpDrv = DRIVER_FindFromHDrvr(hDriver)) != NULL) {
 120         retval = DRIVER_SendMessage(lpDrv, msg, lParam1, lParam2);
 121     } else {
 122         WARN("Bad driver handle %p\n", hDriver);
 123     }
 124     TRACE("retval = %ld\n", retval);
 125
 126     return retval;
 127 }
 128
 129 /**************************************************************************
 130  *                              DRIVER_RemoveFromList           [internal]
 131  *
 132  * Generates all the logic to handle driver closure / deletion
 133  * Removes a driver struct to the list of open drivers.
 134  */
 135 static  BOOL    DRIVER_RemoveFromList(LPWINE_DRIVER lpDrv)
 136 {
 137     if (!(lpDrv->dwFlags & WINE_GDF_16BIT)) {
 138         /* last of this driver in list ? */
 139         if (DRIVER_GetNumberOfModuleRefs(lpDrv->d.d32.hModule, NULL) == 1) {
 140             DRIVER_SendMessage(lpDrv, DRV_DISABLE, 0L, 0L);
 141             DRIVER_SendMessage(lpDrv, DRV_FREE,    0L, 0L);
 142         }
 143     }
 144
 145     if (lpDrv->lpPrevItem)
 146         lpDrv->lpPrevItem->lpNextItem = lpDrv->lpNextItem;
 147     else
 148         lpDrvItemList = lpDrv->lpNextItem;
 149     if (lpDrv->lpNextItem)
 150         lpDrv->lpNextItem->lpPrevItem = lpDrv->lpPrevItem;
 151     /* trash magic number */
 152     lpDrv->dwMagic ^= 0xa5a5a5a5;
 153
 154     return TRUE;
 155 }
 156
 157 /**************************************************************************
 158  *                              DRIVER_AddToList                [internal]
 159  *
 160  * Adds a driver struct to the list of open drivers.
 161  * Generates all the logic to handle driver creation / open.
 162  */
 163 static  BOOL    DRIVER_AddToList(LPWINE_DRIVER lpNewDrv, LPARAM lParam1, LPARAM lParam2)
 164 {
 165     lpNewDrv->dwMagic = WINE_DI_MAGIC;
 166     /* First driver to be loaded for this module, need to load correctly the module */
 167     if (!(lpNewDrv->dwFlags & WINE_GDF_16BIT)) {
 168         /* first of this driver in list ? */
 169         if (DRIVER_GetNumberOfModuleRefs(lpNewDrv->d.d32.hModule, NULL) == 0) {
 170             if (DRIVER_SendMessage(lpNewDrv, DRV_LOAD, 0L, 0L) != DRV_SUCCESS) {
 171                 TRACE("DRV_LOAD failed on driver 0x%08lx\n", (DWORD)lpNewDrv);
 172                 return FALSE;
 173             }
 174             /* returned value is not checked */
 175             DRIVER_SendMessage(lpNewDrv, DRV_ENABLE, 0L, 0L);
 176         }
 177     }
 178
 179     lpNewDrv->lpNextItem = NULL;
 180     if (lpDrvItemList == NULL) {
 181         lpDrvItemList = lpNewDrv;
 182         lpNewDrv->lpPrevItem = NULL;
 183     } else {
 184         LPWINE_DRIVER   lpDrv = lpDrvItemList;  /* find end of list */
 185         while (lpDrv->lpNextItem != NULL)
 186             lpDrv = lpDrv->lpNextItem;
 187
 188         lpDrv->lpNextItem = lpNewDrv;
 189         lpNewDrv->lpPrevItem = lpDrv;
 190     }
 191
 192     if (!(lpNewDrv->dwFlags & WINE_GDF_16BIT)) {
 193         /* Now just open a new instance of a driver on this module */
 194         lpNewDrv->d.d32.dwDriverID = DRIVER_SendMessage(lpNewDrv, DRV_OPEN, lParam1, lParam2);
 195
 196         if (lpNewDrv->d.d32.dwDriverID == 0) {
 197             TRACE("DRV_OPEN failed on driver 0x%08lx\n", (DWORD)lpNewDrv);
 198             DRIVER_RemoveFromList(lpNewDrv);
 199             return FALSE;
 200         }
 201     }
 202     return TRUE;
 203 }
 204
 205 /**************************************************************************
 206  *                              DRIVER_GetLibName               [internal]
 207  *
 208  */
 209 BOOL    DRIVER_GetLibName(LPCWSTR keyName, LPCWSTR sectName, LPWSTR buf, int sz)
 210 {
 211     HKEY        hKey, hSecKey;
 212     DWORD       bufLen, lRet;
 213     static const WCHAR wszSystemIni[] = {'S','Y','S','T','E','M','.','I','N','I',0};
 214     WCHAR       wsznull = '\0';
 215
 216     lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE, HKLM_BASE, 0, KEY_QUERY_VALUE, &hKey);
 217     if (lRet == ERROR_SUCCESS) {
 218         lRet = RegOpenKeyExW(hKey, sectName, 0, KEY_QUERY_VALUE, &hSecKey);
 219         if (lRet == ERROR_SUCCESS) {
 220             bufLen = sz;
 221             lRet = RegQueryValueExW(hSecKey, keyName, 0, 0, (void*)buf, &bufLen);
 222             RegCloseKey( hSecKey );
 223         }
 224         RegCloseKey( hKey );
 225     }
 226     if (lRet == ERROR_SUCCESS) return TRUE;
 227     /* default to system.ini if we can't find it in the registry,
 228      * to support native installations where system.ini is still used */
 229     return GetPrivateProfileStringW(sectName, keyName, &wsznull, buf, sz / sizeof(WCHAR), wszSystemIni);
 230 }
 231
 232 /**************************************************************************
 233  *                              DRIVER_TryOpenDriver32          [internal]
 234  *
 235  * Tries to load a 32 bit driver whose DLL's (module) name is fn
 236  */
 237 LPWINE_DRIVER   DRIVER_TryOpenDriver32(LPCWSTR fn, LPARAM lParam2)
 238 {
 239     LPWINE_DRIVER       lpDrv = NULL;
 240     HMODULE             hModule = 0;
 241     LPWSTR              ptr;
 242     LPCSTR              cause = 0;
 243
 244     TRACE("(%s, %08lX);\n", debugstr_w(fn), lParam2);
 245
 246     if ((ptr = strchrW(fn, ' ')) != NULL) {
 247         *ptr++ = '\0';
 248         while (*ptr == ' ') ptr++;
 249         if (*ptr == '\0') ptr = NULL;
 250     }
 251
 252     lpDrv = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_DRIVER));
 253     if (lpDrv == NULL) {cause = "OOM"; goto exit;}
 254
 255     if ((hModule = LoadLibraryW(fn)) == 0) {cause = "Not a 32 bit lib"; goto exit;}
 256
 257     lpDrv->d.d32.lpDrvProc = (DRIVERPROC)GetProcAddress(hModule, "DriverProc");
 258     if (lpDrv->d.d32.lpDrvProc == NULL) {cause = "no DriverProc"; goto exit;}
 259
 260     lpDrv->dwFlags          = 0;
 261     lpDrv->d.d32.hModule    = hModule;
 262     lpDrv->d.d32.dwDriverID = 0;
 263
 264     /* Win32 installable drivers must support a two phase opening scheme:
 265      * + first open with NULL as lParam2 (session instance),
 266      * + then do a second open with the real non null lParam2)
 267      */
 268     if (DRIVER_GetNumberOfModuleRefs(lpDrv->d.d32.hModule, NULL) == 0 && lParam2)
 269     {
 270         LPWINE_DRIVER   ret;
 271
 272         if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, 0L))
 273         {
 274             cause = "load0 failed";
 275             goto exit;
 276         }
 277         ret = DRIVER_TryOpenDriver32(fn, lParam2);
 278         if (!ret)
 279         {
 280             CloseDriver((HDRVR)lpDrv, 0L, 0L);
 281             cause = "load1 failed";
 282             goto exit;
 283         }
 284         return ret;
 285     }
 286
 287     if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, lParam2))
 288     {cause = "load failed"; goto exit;}
 289
 290     TRACE("=> %p\n", lpDrv);
 291     return lpDrv;
 292  exit:
 293     FreeLibrary(hModule);
 294     HeapFree(GetProcessHeap(), 0, lpDrv);
 295     TRACE("Unable to load 32 bit module %s: %s\n", debugstr_w(fn), cause);
 296     return NULL;
 297 }
 298
 299 /**************************************************************************
 300  *                              OpenDriverA                     [WINMM.@]
 301  *                              DrvOpenA                        [WINMM.@]
 302  * (0,1,DRV_LOAD  ,0       ,0)
 303  * (0,1,DRV_ENABLE,0       ,0)
 304  * (0,1,DRV_OPEN  ,buf[256],0)
 305  */
 306 HDRVR WINAPI OpenDriverA(LPCSTR lpDriverName, LPCSTR lpSectionName, LPARAM lParam)
 307 {
 308     INT                 len;
 309     LPWSTR              dn = NULL;
 310     LPWSTR              sn = NULL;
 311     HDRVR               ret = 0;
 312
 313     if (lpDriverName)
 314     {
 315         len = MultiByteToWideChar( CP_ACP, 0, lpDriverName, -1, NULL, 0 );
 316         dn = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 317         if (!dn) goto done;
 318         MultiByteToWideChar( CP_ACP, 0, lpDriverName, -1, dn, len );
 319     }
 320
 321     if (lpSectionName)
 322     {
 323         len = MultiByteToWideChar( CP_ACP, 0, lpSectionName, -1, NULL, 0 );
 324         sn = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 325         if (!sn) goto done;
 326         MultiByteToWideChar( CP_ACP, 0, lpSectionName, -1, sn, len );
 327     }
 328
 329     ret = OpenDriver(dn, sn, lParam);
 330
 331 done:
 332     HeapFree(GetProcessHeap(), 0, dn);
 333     HeapFree(GetProcessHeap(), 0, sn);
 334     return ret;
 335 }
 336
 337 /**************************************************************************
 338  *                              OpenDriver                      [WINMM.@]
 339  *                              DrvOpen                         [WINMM.@]
 340  */
 341 HDRVR WINAPI OpenDriver(LPCWSTR lpDriverName, LPCWSTR lpSectionName, LPARAM lParam)
 342 {
 343     LPWINE_DRIVER       lpDrv = NULL;
 344     WCHAR               libName[128];
 345     LPCWSTR             lsn = lpSectionName;
 346
 347     TRACE("(%s, %s, 0x%08lx);\n",
 348           debugstr_w(lpDriverName), debugstr_w(lpSectionName), lParam);
 349
 350     if (lsn == NULL) {
 351         static const WCHAR wszDrivers32[] = {'D','r','i','v','e','r','s','3','2',0};
 352         lstrcpynW(libName, lpDriverName, sizeof(libName) / sizeof(WCHAR));
 353
 354         if ((lpDrv = DRIVER_TryOpenDriver32(libName, lParam)))
 355             goto the_end;
 356         lsn = wszDrivers32;
 357     }
 358     if (DRIVER_GetLibName(lpDriverName, lsn, libName, sizeof(libName)) &&
 359         (lpDrv = DRIVER_TryOpenDriver32(libName, lParam)))
 360         goto the_end;
 361
 362     /* now we will try a 16 bit driver (and add all the glue to make it work... which
 363      * is located in our mmsystem implementation)
 364      * so ensure, we can load our mmsystem, otherwise just fail
 365      */
 366     WINMM_CheckForMMSystem();
 367     if (pFnOpenDriver16 &&
 368         (lpDrv = pFnOpenDriver16(lpDriverName, lpSectionName, lParam)))
 369     {
 370         if (DRIVER_AddToList(lpDrv, 0, lParam)) goto the_end;
 371         HeapFree(GetProcessHeap(), 0, lpDrv);
 372     }
 373     TRACE("Failed to open driver %s from system.ini file, section %s\n",
 374           debugstr_w(lpDriverName), debugstr_w(lpSectionName));
 375     return 0;
 376
 377  the_end:
 378     if (lpDrv)  TRACE("=> %08lx\n", (DWORD)lpDrv);
 379     return (HDRVR)lpDrv;
 380 }
 381
 382 /**************************************************************************
 383  *                      CloseDriver                             [WINMM.@]
 384  *                      DrvClose                                [WINMM.@]
 385  */
 386 LRESULT WINAPI CloseDriver(HDRVR hDrvr, LPARAM lParam1, LPARAM lParam2)
 387 {
 388     LPWINE_DRIVER       lpDrv;
 389
 390     TRACE("(%p, %08lX, %08lX);\n", hDrvr, lParam1, lParam2);
 391
 392     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL)
 393     {
 394         if (lpDrv->dwFlags & WINE_GDF_16BIT)
 395         {
 396             if (pFnCloseDriver16)
 397                 pFnCloseDriver16(lpDrv->d.d16.hDriver16, lParam1, lParam2);
 398         }
 399         else
 400         {
 401             DRIVER_SendMessage(lpDrv, DRV_CLOSE, lParam1, lParam2);
 402             lpDrv->d.d32.dwDriverID = 0;
 403         }
 404         if (DRIVER_RemoveFromList(lpDrv)) {
 405             if (!(lpDrv->dwFlags & WINE_GDF_16BIT))
 406             {
 407                 LPWINE_DRIVER       lpDrv0;
 408
 409                 /* if driver has an opened session instance, we have to close it too */
 410                 if (DRIVER_GetNumberOfModuleRefs(lpDrv->d.d32.hModule, &lpDrv0) == 1)
 411                 {
 412                     DRIVER_SendMessage(lpDrv0, DRV_CLOSE, 0L, 0L);
 413                     lpDrv0->d.d32.dwDriverID = 0;
 414                     DRIVER_RemoveFromList(lpDrv0);
 415                     FreeLibrary(lpDrv0->d.d32.hModule);
 416                     HeapFree(GetProcessHeap(), 0, lpDrv0);
 417                 }
 418                 FreeLibrary(lpDrv->d.d32.hModule);
 419             }
 420             HeapFree(GetProcessHeap(), 0, lpDrv);
 421             return TRUE;
 422         }
 423     }
 424     WARN("Failed to close driver\n");
 425     return FALSE;
 426 }
 427
 428 /**************************************************************************
 429  *                              GetDriverFlags          [WINMM.@]
 430  * [in] hDrvr handle to the driver
 431  *
 432  * Returns:
 433  *      0x00000000 if hDrvr is an invalid handle
 434  *      0x80000000 if hDrvr is a valid 32 bit driver
 435  *      0x90000000 if hDrvr is a valid 16 bit driver
 436  *
 437  * native WINMM doesn't return those flags
 438  *      0x80000000 for a valid 32 bit driver and that's it
 439  *      (I may have mixed up the two flags :-(
 440  */
 441 DWORD   WINAPI GetDriverFlags(HDRVR hDrvr)
 442 {
 443     LPWINE_DRIVER       lpDrv;
 444     DWORD               ret = 0;
 445
 446     TRACE("(%p)\n", hDrvr);
 447
 448     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
 449         ret = WINE_GDF_EXIST | lpDrv->dwFlags;
 450     }
 451     return ret;
 452 }
 453
 454 /**************************************************************************
 455  *                              GetDriverModuleHandle   [WINMM.@]
 456  *                              DrvGetModuleHandle      [WINMM.@]
 457  */
 458 HMODULE WINAPI GetDriverModuleHandle(HDRVR hDrvr)
 459 {
 460     LPWINE_DRIVER       lpDrv;
 461     HMODULE             hModule = 0;
 462
 463     TRACE("(%p);\n", hDrvr);
 464
 465     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
 466         if (!(lpDrv->dwFlags & WINE_GDF_16BIT))
 467             hModule = lpDrv->d.d32.hModule;
 468     }
 469     TRACE("=> %p\n", hModule);
 470     return hModule;
 471 }
 472
 473 /**************************************************************************
 474  *                              DefDriverProc                     [WINMM.@]
 475  *                              DrvDefDriverProc                  [WINMM.@]
 476  */
 477 LRESULT WINAPI DefDriverProc(DWORD_PTR dwDriverIdentifier, HDRVR hDrv,
 478                              UINT Msg, LPARAM lParam1, LPARAM lParam2)
 479 {
 480     switch (Msg) {
 481     case DRV_LOAD:
 482     case DRV_FREE:
 483     case DRV_ENABLE:
 484     case DRV_DISABLE:
 485         return 1;
 486     case DRV_INSTALL:
 487     case DRV_REMOVE:
 488         return DRV_SUCCESS;
 489     default:
 490         return 0;
 491     }
 492 }
 493
 494 /**************************************************************************
 495  *                              DriverCallback                  [WINMM.@]
 496  */
 497 BOOL WINAPI DriverCallback(DWORD dwCallBack, UINT uFlags, HDRVR hDev,
 498                            UINT wMsg, DWORD dwUser, DWORD dwParam1,
 499                            DWORD dwParam2)
 500 {
 501     TRACE("(%08lX, %04X, %p, %04X, %08lX, %08lX, %08lX); !\n",
 502           dwCallBack, uFlags, hDev, wMsg, dwUser, dwParam1, dwParam2);
 503
 504     switch (uFlags & DCB_TYPEMASK) {
 505     case DCB_NULL:
 506         TRACE("Null !\n");
 507         if (dwCallBack)
 508             WARN("uFlags=%04X has null DCB value, but dwCallBack=%08lX is not null !\n", uFlags, dwCallBack);
 509         break;
 510     case DCB_WINDOW:
 511         TRACE("Window(%04lX) handle=%p!\n", dwCallBack, hDev);
 512         PostMessageA((HWND)dwCallBack, wMsg, (WPARAM)hDev, dwParam1);
 513         break;
 514     case DCB_TASK: /* aka DCB_THREAD */
 515         TRACE("Task(%04lx) !\n", dwCallBack);
 516         PostThreadMessageA(dwCallBack, wMsg, (WPARAM)hDev, dwParam1);
 517         break;
 518     case DCB_FUNCTION:
 519         TRACE("Function (32 bit) !\n");
 520         ((LPDRVCALLBACK)dwCallBack)(hDev, wMsg, dwUser, dwParam1, dwParam2);
 521         break;
 522     case DCB_EVENT:
 523         TRACE("Event(%08lx) !\n", dwCallBack);
 524         SetEvent((HANDLE)dwCallBack);
 525         break;
 526     case 6: /* I would dub it DCB_MMTHREADSIGNAL */
 527         /* this is an undocumented DCB_ value used for mmThreads
 528          * loword of dwCallBack contains the handle of the lpMMThd block
 529          * which dwSignalCount has to be incremented
 530          */
 531         if (pFnGetMMThread16)
 532         {
 533             WINE_MMTHREAD*      lpMMThd = pFnGetMMThread16(LOWORD(dwCallBack));
 534
 535             TRACE("mmThread (%04x, %p) !\n", LOWORD(dwCallBack), lpMMThd);
 536             /* same as mmThreadSignal16 */
 537             InterlockedIncrement(&lpMMThd->dwSignalCount);
 538             SetEvent(lpMMThd->hEvent);
 539             /* some other stuff on lpMMThd->hVxD */
 540         }
 541         break;
 542 #if 0
 543     case 4:
 544         /* this is an undocumented DCB_ value for... I don't know */
 545         break;
 546 #endif
 547     default:
 548         WARN("Unknown callback type %d\n", uFlags & DCB_TYPEMASK);
 549         return FALSE;
 550     }
 551     TRACE("Done\n");
 552     return TRUE;
 553 }
 554
 555 /******************************************************************
 556  *              DRIVER_UnloadAll
 557  *
 558  *
 559  */
 560 void    DRIVER_UnloadAll(void)
 561 {
 562     LPWINE_DRIVER       lpDrv;
 563     LPWINE_DRIVER       lpNextDrv = NULL;
 564     unsigned            count = 0;
 565
 566     for (lpDrv = lpDrvItemList; lpDrv != NULL; lpDrv = lpNextDrv)
 567     {
 568         lpNextDrv = lpDrv->lpNextItem;
 569         CloseDriver((HDRVR)lpDrv, 0, 0);
 570         count++;
 571     }
 572     TRACE("Unloaded %u drivers\n", count);
 573 }