dlls/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <string.h>
  27 #include <stdarg.h>
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "wingdi.h"
  31 #include "winuser.h"
  32 #include "winnls.h"
  33 #include "winreg.h"
  34 #include "mmddk.h"
  35 #include "winemm.h"
  36 #include "wine/debug.h"
  37 #include "wine/unicode.h"
  38 #include "excpt.h"
  39 #include "wine/exception.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(driver);
  42
  43 static CRITICAL_SECTION mmdriver_lock;
  44 static CRITICAL_SECTION_DEBUG mmdriver_lock_debug =
  45 {
  46     0, 0, &mmdriver_lock,
  47     { &mmdriver_lock_debug.ProcessLocksList, &mmdriver_lock_debug.ProcessLocksList },
  48       0, 0, { (DWORD_PTR)(__FILE__ ": mmdriver_lock") }
  49 };
  50 static CRITICAL_SECTION mmdriver_lock = { &mmdriver_lock_debug, -1, 0, 0, 0, 0 };
  51
  52 static LPWINE_DRIVER   lpDrvItemList  /* = NULL */;
  53 static const WCHAR HKLM_BASE[] = {'S','o','f','t','w','a','r','e','\\','M','i','c','r','o','s','o','f','t','\\',
  54                                   'W','i','n','d','o','w','s',' ','N','T','\\','C','u','r','r','e','n','t','V','e','r','s','i','o','n',0};
  55
  56 static void DRIVER_Dump(const char *comment)
  57 {
  58 #if 0
  59     LPWINE_DRIVER       lpDrv;
  60
  61     TRACE("%s\n", comment);
  62
  63     EnterCriticalSection( &mmdriver_lock );
  64
  65     for (lpDrv = lpDrvItemList; lpDrv != NULL; lpDrv = lpDrv->lpNextItem)
  66     {
  67         TRACE("%p, magic %04lx, id %p, next %p\n", lpDrv, lpDrv->dwMagic, lpDrv->d.d32.dwDriverID, lpDrv->lpNextItem);
  68     }
  69
  70     LeaveCriticalSection( &mmdriver_lock );
  71 #endif
  72 }
  73
  74 /**************************************************************************
  75  *                      DRIVER_GetNumberOfModuleRefs            [internal]
  76  *
  77  * Returns the number of open drivers which share the same module.
  78  */
  79 static  unsigned DRIVER_GetNumberOfModuleRefs(HMODULE hModule, WINE_DRIVER** found)
  80 {
  81     LPWINE_DRIVER       lpDrv;
  82     unsigned            count = 0;
  83
  84     EnterCriticalSection( &mmdriver_lock );
  85
  86     if (found) *found = NULL;
  87     for (lpDrv = lpDrvItemList; lpDrv; lpDrv = lpDrv->lpNextItem)
  88     {
  89         if (lpDrv->hModule == hModule)
  90         {
  91             if (found && !*found) *found = lpDrv;
  92             count++;
  93         }
  94     }
  95
  96     LeaveCriticalSection( &mmdriver_lock );
  97     return count;
  98 }
  99
 100 /**************************************************************************
 101  *                              DRIVER_FindFromHDrvr            [internal]
 102  *
 103  * From a hDrvr being 32 bits, returns the WINE internal structure.
 104  */
 105 LPWINE_DRIVER   DRIVER_FindFromHDrvr(HDRVR hDrvr)
 106 {
 107     LPWINE_DRIVER d;
 108
 109     __TRY
 110     {
 111         d = (LPWINE_DRIVER)hDrvr;
 112         if (d && d->dwMagic != WINE_DI_MAGIC) d = NULL;
 113     }
 114     __EXCEPT_PAGE_FAULT
 115     {
 116         return NULL;
 117     }
 118     __ENDTRY;
 119
 120     if (d) TRACE("%p -> %p, %p\n", hDrvr, d->lpDrvProc, (void *)d->dwDriverID);
 121     else TRACE("%p -> NULL\n", hDrvr);
 122
 123     return d;
 124 }
 125
 126 /**************************************************************************
 127  *                              DRIVER_SendMessage              [internal]
 128  */
 129 static inline LRESULT DRIVER_SendMessage(LPWINE_DRIVER lpDrv, UINT msg,
 130                                          LPARAM lParam1, LPARAM lParam2)
 131 {
 132     LRESULT             ret = 0;
 133
 134     TRACE("Before call32 proc=%p drvrID=%08lx hDrv=%p wMsg=%04x p1=%08lx p2=%08lx\n",
 135           lpDrv->lpDrvProc, lpDrv->dwDriverID, lpDrv, msg, lParam1, lParam2);
 136     ret = lpDrv->lpDrvProc(lpDrv->dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2);
 137     TRACE("After  call32 proc=%p drvrID=%08lx hDrv=%p wMsg=%04x p1=%08lx p2=%08lx => %08lx\n",
 138           lpDrv->lpDrvProc, lpDrv->dwDriverID, lpDrv, msg, lParam1, lParam2, ret);
 139
 140     return ret;
 141 }
 142
 143 /**************************************************************************
 144  *                              SendDriverMessage               [WINMM.@]
 145  *                              DrvSendMessage                  [WINMM.@]
 146  */
 147 LRESULT WINAPI SendDriverMessage(HDRVR hDriver, UINT msg, LPARAM lParam1,
 148                                  LPARAM lParam2)
 149 {
 150     LPWINE_DRIVER       lpDrv;
 151     LRESULT             retval = 0;
 152
 153     TRACE("(%p, %04X, %08lX, %08lX)\n", hDriver, msg, lParam1, lParam2);
 154
 155     if ((lpDrv = DRIVER_FindFromHDrvr(hDriver)) != NULL) {
 156         retval = DRIVER_SendMessage(lpDrv, msg, lParam1, lParam2);
 157     } else {
 158         WARN("Bad driver handle %p\n", hDriver);
 159     }
 160     TRACE("retval = %ld\n", retval);
 161
 162     return retval;
 163 }
 164
 165 /**************************************************************************
 166  *                              DRIVER_RemoveFromList           [internal]
 167  *
 168  * Generates all the logic to handle driver closure / deletion
 169  * Removes a driver struct to the list of open drivers.
 170  */
 171 static  BOOL    DRIVER_RemoveFromList(LPWINE_DRIVER lpDrv)
 172 {
 173     /* last of this driver in list ? */
 174     if (DRIVER_GetNumberOfModuleRefs(lpDrv->hModule, NULL) == 1) {
 175         DRIVER_SendMessage(lpDrv, DRV_DISABLE, 0L, 0L);
 176         DRIVER_SendMessage(lpDrv, DRV_FREE,    0L, 0L);
 177     }
 178
 179     EnterCriticalSection( &mmdriver_lock );
 180
 181     if (lpDrv->lpPrevItem)
 182         lpDrv->lpPrevItem->lpNextItem = lpDrv->lpNextItem;
 183     else
 184         lpDrvItemList = lpDrv->lpNextItem;
 185     if (lpDrv->lpNextItem)
 186         lpDrv->lpNextItem->lpPrevItem = lpDrv->lpPrevItem;
 187     /* trash magic number */
 188     lpDrv->dwMagic ^= 0xa5a5a5a5;
 189     lpDrv->lpDrvProc = NULL;
 190     lpDrv->dwDriverID = 0;
 191
 192     LeaveCriticalSection( &mmdriver_lock );
 193
 194     return TRUE;
 195 }
 196
 197 /**************************************************************************
 198  *                              DRIVER_AddToList                [internal]
 199  *
 200  * Adds a driver struct to the list of open drivers.
 201  * Generates all the logic to handle driver creation / open.
 202  */
 203 static  BOOL    DRIVER_AddToList(LPWINE_DRIVER lpNewDrv, LPARAM lParam1, LPARAM lParam2)
 204 {
 205     lpNewDrv->dwMagic = WINE_DI_MAGIC;
 206     /* First driver to be loaded for this module, need to load correctly the module */
 207     /* first of this driver in list ? */
 208     if (DRIVER_GetNumberOfModuleRefs(lpNewDrv->hModule, NULL) == 0) {
 209         if (DRIVER_SendMessage(lpNewDrv, DRV_LOAD, 0L, 0L) != DRV_SUCCESS) {
 210             TRACE("DRV_LOAD failed on driver %p\n", lpNewDrv);
 211             return FALSE;
 212         }
 213         /* returned value is not checked */
 214         DRIVER_SendMessage(lpNewDrv, DRV_ENABLE, 0L, 0L);
 215     }
 216
 217     /* Now just open a new instance of a driver on this module */
 218     lpNewDrv->dwDriverID = DRIVER_SendMessage(lpNewDrv, DRV_OPEN, lParam1, lParam2);
 219
 220     if (lpNewDrv->dwDriverID == 0)
 221     {
 222         TRACE("DRV_OPEN failed on driver %p\n", lpNewDrv);
 223         return FALSE;
 224     }
 225
 226     EnterCriticalSection( &mmdriver_lock );
 227
 228     lpNewDrv->lpNextItem = NULL;
 229     if (lpDrvItemList == NULL) {
 230         lpDrvItemList = lpNewDrv;
 231         lpNewDrv->lpPrevItem = NULL;
 232     } else {
 233         LPWINE_DRIVER   lpDrv = lpDrvItemList;  /* find end of list */
 234         while (lpDrv->lpNextItem != NULL)
 235             lpDrv = lpDrv->lpNextItem;
 236
 237         lpDrv->lpNextItem = lpNewDrv;
 238         lpNewDrv->lpPrevItem = lpDrv;
 239     }
 240
 241     LeaveCriticalSection( &mmdriver_lock );
 242     return TRUE;
 243 }
 244
 245 /**************************************************************************
 246  *                              DRIVER_GetLibName               [internal]
 247  *
 248  */
 249 BOOL    DRIVER_GetLibName(LPCWSTR keyName, LPCWSTR sectName, LPWSTR buf, int sz)
 250 {
 251     HKEY        hKey, hSecKey;
 252     DWORD       bufLen, lRet;
 253     static const WCHAR wszSystemIni[] = {'S','Y','S','T','E','M','.','I','N','I',0};
 254     WCHAR       wsznull = '\0';
 255
 256     TRACE("registry: %s, %s, %p, %d\n", debugstr_w(keyName), debugstr_w(sectName), buf, sz);
 257
 258     lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE, HKLM_BASE, 0, KEY_QUERY_VALUE, &hKey);
 259     if (lRet == ERROR_SUCCESS) {
 260         lRet = RegOpenKeyExW(hKey, sectName, 0, KEY_QUERY_VALUE, &hSecKey);
 261         if (lRet == ERROR_SUCCESS) {
 262             bufLen = sz;
 263             lRet = RegQueryValueExW(hSecKey, keyName, 0, 0, (void*)buf, &bufLen);
 264             RegCloseKey( hSecKey );
 265         }
 266         RegCloseKey( hKey );
 267     }
 268     if (lRet == ERROR_SUCCESS) return TRUE;
 269
 270     /* default to system.ini if we can't find it in the registry,
 271      * to support native installations where system.ini is still used */
 272     TRACE("system.ini: %s, %s, %p, %d\n", debugstr_w(keyName), debugstr_w(sectName), buf, sz);
 273     return GetPrivateProfileStringW(sectName, keyName, &wsznull, buf, sz / sizeof(WCHAR), wszSystemIni);
 274 }
 275
 276 /**************************************************************************
 277  *                              DRIVER_TryOpenDriver32          [internal]
 278  *
 279  * Tries to load a 32 bit driver whose DLL's (module) name is fn
 280  */
 281 LPWINE_DRIVER   DRIVER_TryOpenDriver32(LPCWSTR fn, LPARAM lParam2)
 282 {
 283     LPWINE_DRIVER       lpDrv = NULL;
 284     HMODULE             hModule = 0;
 285     LPWSTR              ptr;
 286     LPCSTR              cause = 0;
 287
 288     TRACE("(%s, %08lX);\n", debugstr_w(fn), lParam2);
 289
 290     if ((ptr = strchrW(fn, ' ')) != NULL) {
 291         *ptr++ = '\0';
 292         while (*ptr == ' ') ptr++;
 293         if (*ptr == '\0') ptr = NULL;
 294     }
 295
 296     lpDrv = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_DRIVER));
 297     if (lpDrv == NULL) {cause = "OOM"; goto exit;}
 298
 299     if ((hModule = LoadLibraryW(fn)) == 0) {cause = "Not a 32 bit lib"; goto exit;}
 300
 301     lpDrv->lpDrvProc = (DRIVERPROC)GetProcAddress(hModule, "DriverProc");
 302     if (lpDrv->lpDrvProc == NULL) {cause = "no DriverProc"; goto exit;}
 303
 304     lpDrv->dwFlags    = 0;
 305     lpDrv->hModule    = hModule;
 306     lpDrv->dwDriverID = 0;
 307
 308     /* Win32 installable drivers must support a two phase opening scheme:
 309      * + first open with NULL as lParam2 (session instance),
 310      * + then do a second open with the real non null lParam2)
 311      */
 312     if (DRIVER_GetNumberOfModuleRefs(lpDrv->hModule, NULL) == 0 && lParam2)
 313     {
 314         LPWINE_DRIVER   ret;
 315
 316         if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, 0L))
 317         {
 318             cause = "load0 failed";
 319             goto exit;
 320         }
 321         ret = DRIVER_TryOpenDriver32(fn, lParam2);
 322         if (!ret)
 323         {
 324             CloseDriver((HDRVR)lpDrv, 0L, 0L);
 325             cause = "load1 failed";
 326             goto exit;
 327         }
 328         lpDrv->dwFlags |= WINE_GDF_SESSION;
 329         return ret;
 330     }
 331
 332     if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, lParam2))
 333     {cause = "load failed"; goto exit;}
 334
 335     TRACE("=> %p\n", lpDrv);
 336     return lpDrv;
 337  exit:
 338     FreeLibrary(hModule);
 339     HeapFree(GetProcessHeap(), 0, lpDrv);
 340     TRACE("Unable to load 32 bit module %s: %s\n", debugstr_w(fn), cause);
 341     return NULL;
 342 }
 343
 344 /**************************************************************************
 345  *                              OpenDriverA                     [WINMM.@]
 346  *                              DrvOpenA                        [WINMM.@]
 347  * (0,1,DRV_LOAD  ,0       ,0)
 348  * (0,1,DRV_ENABLE,0       ,0)
 349  * (0,1,DRV_OPEN  ,buf[256],0)
 350  */
 351 HDRVR WINAPI OpenDriverA(LPCSTR lpDriverName, LPCSTR lpSectionName, LPARAM lParam)
 352 {
 353     INT                 len;
 354     LPWSTR              dn = NULL;
 355     LPWSTR              sn = NULL;
 356     HDRVR               ret = 0;
 357
 358     if (lpDriverName)
 359     {
 360         len = MultiByteToWideChar( CP_ACP, 0, lpDriverName, -1, NULL, 0 );
 361         dn = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 362         if (!dn) goto done;
 363         MultiByteToWideChar( CP_ACP, 0, lpDriverName, -1, dn, len );
 364     }
 365
 366     if (lpSectionName)
 367     {
 368         len = MultiByteToWideChar( CP_ACP, 0, lpSectionName, -1, NULL, 0 );
 369         sn = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 370         if (!sn) goto done;
 371         MultiByteToWideChar( CP_ACP, 0, lpSectionName, -1, sn, len );
 372     }
 373
 374     ret = OpenDriver(dn, sn, lParam);
 375
 376 done:
 377     HeapFree(GetProcessHeap(), 0, dn);
 378     HeapFree(GetProcessHeap(), 0, sn);
 379     return ret;
 380 }
 381
 382 /**************************************************************************
 383  *                              OpenDriver                      [WINMM.@]
 384  *                              DrvOpen                         [WINMM.@]
 385  */
 386 HDRVR WINAPI OpenDriver(LPCWSTR lpDriverName, LPCWSTR lpSectionName, LPARAM lParam)
 387 {
 388     LPWINE_DRIVER       lpDrv = NULL;
 389     WCHAR               libName[MAX_PATH + 1];
 390     LPCWSTR             lsn = lpSectionName;
 391
 392     TRACE("(%s, %s, 0x%08lx);\n",
 393           debugstr_w(lpDriverName), debugstr_w(lpSectionName), lParam);
 394
 395     DRIVER_Dump("BEFORE:");
 396
 397     if (lsn == NULL) {
 398         static const WCHAR wszDrivers32[] = {'D','r','i','v','e','r','s','3','2',0};
 399         lstrcpynW(libName, lpDriverName, sizeof(libName) / sizeof(WCHAR));
 400
 401         if ((lpDrv = DRIVER_TryOpenDriver32(libName, lParam)))
 402             goto the_end;
 403         lsn = wszDrivers32;
 404     }
 405     if (DRIVER_GetLibName(lpDriverName, lsn, libName, sizeof(libName)) &&
 406         (lpDrv = DRIVER_TryOpenDriver32(libName, lParam)))
 407         goto the_end;
 408
 409     TRACE("Failed to open driver %s from system.ini file, section %s\n",
 410           debugstr_w(lpDriverName), debugstr_w(lpSectionName));
 411
 412 the_end:
 413     TRACE("=> %p\n", lpDrv);
 414
 415     DRIVER_Dump("AFTER:");
 416
 417     return (HDRVR)lpDrv;
 418 }
 419
 420 /**************************************************************************
 421  *                      CloseDriver                             [WINMM.@]
 422  *                      DrvClose                                [WINMM.@]
 423  */
 424 LRESULT WINAPI CloseDriver(HDRVR hDrvr, LPARAM lParam1, LPARAM lParam2)
 425 {
 426     BOOL ret;
 427     LPWINE_DRIVER       lpDrv;
 428
 429     TRACE("(%p, %08lX, %08lX);\n", hDrvr, lParam1, lParam2);
 430
 431     DRIVER_Dump("BEFORE:");
 432
 433     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL)
 434     {
 435         LPWINE_DRIVER lpDrv0;
 436
 437         DRIVER_SendMessage(lpDrv, DRV_CLOSE, lParam1, lParam2);
 438
 439         DRIVER_RemoveFromList(lpDrv);
 440
 441         if (lpDrv->dwFlags & WINE_GDF_SESSION)
 442             FIXME("WINE_GDF_SESSION: Shouldn't happen (%p)\n", lpDrv);
 443         /* if driver has an opened session instance, we have to close it too */
 444         if (DRIVER_GetNumberOfModuleRefs(lpDrv->hModule, &lpDrv0) == 1 &&
 445             (lpDrv0->dwFlags & WINE_GDF_SESSION))
 446         {
 447             DRIVER_SendMessage(lpDrv0, DRV_CLOSE, 0, 0);
 448             DRIVER_RemoveFromList(lpDrv0);
 449             FreeLibrary(lpDrv0->hModule);
 450             HeapFree(GetProcessHeap(), 0, lpDrv0);
 451         }
 452         FreeLibrary(lpDrv->hModule);
 453
 454         HeapFree(GetProcessHeap(), 0, lpDrv);
 455         ret = TRUE;
 456     }
 457     else
 458     {
 459         WARN("Failed to close driver\n");
 460         ret = FALSE;
 461     }
 462
 463     DRIVER_Dump("AFTER:");
 464
 465     return ret;
 466 }
 467
 468 /**************************************************************************
 469  *                              GetDriverFlags          [WINMM.@]
 470  * [in] hDrvr handle to the driver
 471  *
 472  * Returns:
 473  *      0x00000000 if hDrvr is an invalid handle
 474  *      0x80000000 if hDrvr is a valid 32 bit driver
 475  *      0x90000000 if hDrvr is a valid 16 bit driver
 476  *
 477  * native WINMM doesn't return those flags
 478  *      0x80000000 for a valid 32 bit driver and that's it
 479  *      (I may have mixed up the two flags :-(
 480  */
 481 DWORD   WINAPI GetDriverFlags(HDRVR hDrvr)
 482 {
 483     LPWINE_DRIVER       lpDrv;
 484     DWORD               ret = 0;
 485
 486     TRACE("(%p)\n", hDrvr);
 487
 488     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
 489         ret = WINE_GDF_EXIST | (lpDrv->dwFlags & WINE_GDF_EXTERNAL_MASK);
 490     }
 491     return ret;
 492 }
 493
 494 /**************************************************************************
 495  *                              GetDriverModuleHandle   [WINMM.@]
 496  *                              DrvGetModuleHandle      [WINMM.@]
 497  */
 498 HMODULE WINAPI GetDriverModuleHandle(HDRVR hDrvr)
 499 {
 500     LPWINE_DRIVER       lpDrv;
 501     HMODULE             hModule = 0;
 502
 503     TRACE("(%p);\n", hDrvr);
 504
 505     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
 506         hModule = lpDrv->hModule;
 507     }
 508     TRACE("=> %p\n", hModule);
 509     return hModule;
 510 }
 511
 512 /**************************************************************************
 513  *                              DefDriverProc                     [WINMM.@]
 514  *                              DrvDefDriverProc                  [WINMM.@]
 515  */
 516 LRESULT WINAPI DefDriverProc(DWORD_PTR dwDriverIdentifier, HDRVR hDrv,
 517                              UINT Msg, LPARAM lParam1, LPARAM lParam2)
 518 {
 519     switch (Msg) {
 520     case DRV_LOAD:
 521     case DRV_FREE:
 522     case DRV_ENABLE:
 523     case DRV_DISABLE:
 524         return 1;
 525     case DRV_INSTALL:
 526     case DRV_REMOVE:
 527         return DRV_SUCCESS;
 528     default:
 529         return 0;
 530     }
 531 }
 532
 533 /**************************************************************************
 534  *                              DriverCallback                  [WINMM.@]
 535  */
 536 BOOL WINAPI DriverCallback(DWORD_PTR dwCallBack, DWORD uFlags, HDRVR hDev,
 537                            DWORD wMsg, DWORD_PTR dwUser, DWORD_PTR dwParam1,
 538                            DWORD_PTR dwParam2)
 539 {
 540     TRACE("(%08lX, %04X, %p, %04X, %08lX, %08lX, %08lX)\n",
 541           dwCallBack, uFlags, hDev, wMsg, dwUser, dwParam1, dwParam2);
 542
 543     switch (uFlags & DCB_TYPEMASK) {
 544     case DCB_NULL:
 545         TRACE("Null !\n");
 546         break;
 547     case DCB_WINDOW:
 548         TRACE("Window(%04lX) handle=%p!\n", dwCallBack, hDev);
 549         PostMessageA((HWND)dwCallBack, wMsg, (WPARAM)hDev, dwParam1);
 550         break;
 551     case DCB_TASK: /* aka DCB_THREAD */
 552         TRACE("Task(%04lx) !\n", dwCallBack);
 553         PostThreadMessageA(dwCallBack, wMsg, (WPARAM)hDev, dwParam1);
 554         break;
 555     case DCB_FUNCTION:
 556         TRACE("Function (32 bit) !\n");
 557         if (dwCallBack)
 558             ((LPDRVCALLBACK)dwCallBack)(hDev, wMsg, dwUser, dwParam1, dwParam2);
 559         break;
 560     case DCB_EVENT:
 561         TRACE("Event(%08lx) !\n", dwCallBack);
 562         SetEvent((HANDLE)dwCallBack);
 563         break;
 564 #if 0
 565         /* FIXME: for now only usable in mmsystem.dll16
 566          * If needed, should be enabled back
 567          */
 568     case 6: /* I would dub it DCB_MMTHREADSIGNAL */
 569         /* this is an undocumented DCB_ value used for mmThreads
 570          * loword of dwCallBack contains the handle of the lpMMThd block
 571          * which dwSignalCount has to be incremented
 572          */
 573         if (pFnGetMMThread16)
 574         {
 575             WINE_MMTHREAD*      lpMMThd = pFnGetMMThread16(LOWORD(dwCallBack));
 576
 577             TRACE("mmThread (%04x, %p) !\n", LOWORD(dwCallBack), lpMMThd);
 578             /* same as mmThreadSignal16 */
 579             InterlockedIncrement(&lpMMThd->dwSignalCount);
 580             SetEvent(lpMMThd->hEvent);
 581             /* some other stuff on lpMMThd->hVxD */
 582         }
 583         break;
 584 #endif
 585 #if 0
 586     case 4:
 587         /* this is an undocumented DCB_ value for... I don't know */
 588         break;
 589 #endif
 590     default:
 591         WARN("Unknown callback type %d\n", uFlags & DCB_TYPEMASK);
 592         return FALSE;
 593     }
 594     TRACE("Done\n");
 595     return TRUE;
 596 }
 597
 598 /******************************************************************
 599  *              DRIVER_UnloadAll
 600  *
 601  *
 602  */
 603 void    DRIVER_UnloadAll(void)
 604 {
 605     LPWINE_DRIVER       lpDrv;
 606     LPWINE_DRIVER       lpNextDrv = NULL;
 607     unsigned            count = 0;
 608
 609 restart:
 610     EnterCriticalSection( &mmdriver_lock );
 611
 612     for (lpDrv = lpDrvItemList; lpDrv != NULL; lpDrv = lpNextDrv)
 613     {
 614         lpNextDrv = lpDrv->lpNextItem;
 615
 616         /* session instances will be unloaded automatically */
 617         if (!(lpDrv->dwFlags & WINE_GDF_SESSION))
 618         {
 619             LeaveCriticalSection( &mmdriver_lock );
 620             CloseDriver((HDRVR)lpDrv, 0, 0);
 621             count++;
 622             /* restart from the beginning of the list */
 623             goto restart;
 624         }
 625     }
 626
 627     LeaveCriticalSection( &mmdriver_lock );
 628
 629     TRACE("Unloaded %u drivers\n", count);
 630 }