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 <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 "excpt.h"
  35 #include "wine/exception.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(driver);
  38
  39 static CRITICAL_SECTION mmdriver_lock;
  40 static CRITICAL_SECTION_DEBUG mmdriver_lock_debug =
  41 {
  42     0, 0, &mmdriver_lock,
  43     { &mmdriver_lock_debug.ProcessLocksList, &mmdriver_lock_debug.ProcessLocksList },
  44       0, 0, { (DWORD_PTR)(__FILE__ ": mmdriver_lock") }
  45 };
  46 static CRITICAL_SECTION mmdriver_lock = { &mmdriver_lock_debug, -1, 0, 0, 0, 0 };
  47
  48 static LPWINE_DRIVER   lpDrvItemList  /* = NULL */;
  49
  50 static void DRIVER_Dump(const char *comment)
  51 {
  52 #if 0
  53     LPWINE_DRIVER       lpDrv;
  54
  55     TRACE("%s\n", comment);
  56
  57     EnterCriticalSection( &mmdriver_lock );
  58
  59     for (lpDrv = lpDrvItemList; lpDrv != NULL; lpDrv = lpDrv->lpNextItem)
  60     {
  61         TRACE("%p, magic %04lx, id %p, next %p\n", lpDrv, lpDrv->dwMagic, lpDrv->d.d32.dwDriverID, lpDrv->lpNextItem);
  62     }
  63
  64     LeaveCriticalSection( &mmdriver_lock );
  65 #endif
  66 }
  67
  68 /**************************************************************************
  69  *                      DRIVER_GetNumberOfModuleRefs            [internal]
  70  *
  71  * Returns the number of open drivers which share the same module.
  72  */
  73 static  unsigned DRIVER_GetNumberOfModuleRefs(HMODULE hModule, WINE_DRIVER** found)
  74 {
  75     LPWINE_DRIVER       lpDrv;
  76     unsigned            count = 0;
  77
  78     EnterCriticalSection( &mmdriver_lock );
  79
  80     if (found) *found = NULL;
  81     for (lpDrv = lpDrvItemList; lpDrv; lpDrv = lpDrv->lpNextItem)
  82     {
  83         if (lpDrv->hModule == hModule)
  84         {
  85             if (found && !*found) *found = lpDrv;
  86             count++;
  87         }
  88     }
  89
  90     LeaveCriticalSection( &mmdriver_lock );
  91     return count;
  92 }
  93
  94 /**************************************************************************
  95  *                              DRIVER_FindFromHDrvr            [internal]
  96  *
  97  * From a hDrvr being 32 bits, returns the WINE internal structure.
  98  */
  99 LPWINE_DRIVER   DRIVER_FindFromHDrvr(HDRVR hDrvr)
 100 {
 101     LPWINE_DRIVER d;
 102
 103     __TRY
 104     {
 105         d = (LPWINE_DRIVER)hDrvr;
 106         if (d && d->dwMagic != WINE_DI_MAGIC) d = NULL;
 107     }
 108     __EXCEPT_PAGE_FAULT
 109     {
 110         return NULL;
 111     }
 112     __ENDTRY;
 113
 114     if (d) TRACE("%p -> %p, %p\n", hDrvr, d->lpDrvProc, (void *)d->dwDriverID);
 115     else TRACE("%p -> NULL\n", hDrvr);
 116
 117     return d;
 118 }
 119
 120 /**************************************************************************
 121  *                              DRIVER_SendMessage              [internal]
 122  */
 123 static inline LRESULT DRIVER_SendMessage(LPWINE_DRIVER lpDrv, UINT msg,
 124                                          LPARAM lParam1, LPARAM lParam2)
 125 {
 126     LRESULT             ret;
 127
 128     TRACE("Before call32 proc=%p drvrID=%08Ix hDrv=%p wMsg=%04x p1=%08Ix p2=%08Ix\n",
 129           lpDrv->lpDrvProc, lpDrv->dwDriverID, lpDrv, msg, lParam1, lParam2);
 130     ret = lpDrv->lpDrvProc(lpDrv->dwDriverID, (HDRVR)lpDrv, msg, lParam1, lParam2);
 131     TRACE("After  call32 proc=%p drvrID=%08Ix hDrv=%p wMsg=%04x p1=%08Ix p2=%08Ix => %08Ix\n",
 132           lpDrv->lpDrvProc, lpDrv->dwDriverID, lpDrv, msg, lParam1, lParam2, ret);
 133
 134     return ret;
 135 }
 136
 137 /**************************************************************************
 138  *                              SendDriverMessage               [WINMM.@]
 139  *                              DrvSendMessage                  [WINMM.@]
 140  */
 141 LRESULT WINAPI SendDriverMessage(HDRVR hDriver, UINT msg, LPARAM lParam1,
 142                                  LPARAM lParam2)
 143 {
 144     LPWINE_DRIVER       lpDrv;
 145     LRESULT             retval = 0;
 146
 147     TRACE("(%p, %04X, %08IX, %08IX)\n", hDriver, msg, lParam1, lParam2);
 148
 149     if ((lpDrv = DRIVER_FindFromHDrvr(hDriver)) != NULL) {
 150         retval = DRIVER_SendMessage(lpDrv, msg, lParam1, lParam2);
 151     } else {
 152         WARN("Bad driver handle %p\n", hDriver);
 153     }
 154     TRACE("retval = %Id\n", retval);
 155
 156     return retval;
 157 }
 158
 159 /**************************************************************************
 160  *                              DRIVER_RemoveFromList           [internal]
 161  *
 162  * Generates all the logic to handle driver closure / deletion
 163  * Removes a driver struct to the list of open drivers.
 164  */
 165 static  BOOL    DRIVER_RemoveFromList(LPWINE_DRIVER lpDrv)
 166 {
 167     /* last of this driver in list ? */
 168     if (DRIVER_GetNumberOfModuleRefs(lpDrv->hModule, NULL) == 1) {
 169         DRIVER_SendMessage(lpDrv, DRV_DISABLE, 0L, 0L);
 170         DRIVER_SendMessage(lpDrv, DRV_FREE,    0L, 0L);
 171     }
 172
 173     EnterCriticalSection( &mmdriver_lock );
 174
 175     if (lpDrv->lpPrevItem)
 176         lpDrv->lpPrevItem->lpNextItem = lpDrv->lpNextItem;
 177     else
 178         lpDrvItemList = lpDrv->lpNextItem;
 179     if (lpDrv->lpNextItem)
 180         lpDrv->lpNextItem->lpPrevItem = lpDrv->lpPrevItem;
 181     /* trash magic number */
 182     lpDrv->dwMagic ^= 0xa5a5a5a5;
 183     lpDrv->lpDrvProc = NULL;
 184     lpDrv->dwDriverID = 0;
 185
 186     LeaveCriticalSection( &mmdriver_lock );
 187
 188     return TRUE;
 189 }
 190
 191 /**************************************************************************
 192  *                              DRIVER_AddToList                [internal]
 193  *
 194  * Adds a driver struct to the list of open drivers.
 195  * Generates all the logic to handle driver creation / open.
 196  */
 197 static  BOOL    DRIVER_AddToList(LPWINE_DRIVER lpNewDrv, LPARAM lParam1, LPARAM lParam2)
 198 {
 199     lpNewDrv->dwMagic = WINE_DI_MAGIC;
 200     /* First driver to be loaded for this module, need to load correctly the module */
 201     /* first of this driver in list ? */
 202     if (DRIVER_GetNumberOfModuleRefs(lpNewDrv->hModule, NULL) == 0) {
 203         if (DRIVER_SendMessage(lpNewDrv, DRV_LOAD, 0L, 0L) != DRV_SUCCESS) {
 204             TRACE("DRV_LOAD failed on driver %p\n", lpNewDrv);
 205             return FALSE;
 206         }
 207         /* returned value is not checked */
 208         DRIVER_SendMessage(lpNewDrv, DRV_ENABLE, 0L, 0L);
 209     }
 210
 211     /* Now just open a new instance of a driver on this module */
 212     lpNewDrv->dwDriverID = DRIVER_SendMessage(lpNewDrv, DRV_OPEN, lParam1, lParam2);
 213
 214     if (lpNewDrv->dwDriverID == 0)
 215     {
 216         TRACE("DRV_OPEN failed on driver %p\n", lpNewDrv);
 217         return FALSE;
 218     }
 219
 220     EnterCriticalSection( &mmdriver_lock );
 221
 222     lpNewDrv->lpNextItem = NULL;
 223     if (lpDrvItemList == NULL) {
 224         lpDrvItemList = lpNewDrv;
 225         lpNewDrv->lpPrevItem = NULL;
 226     } else {
 227         LPWINE_DRIVER   lpDrv = lpDrvItemList;  /* find end of list */
 228         while (lpDrv->lpNextItem != NULL)
 229             lpDrv = lpDrv->lpNextItem;
 230
 231         lpDrv->lpNextItem = lpNewDrv;
 232         lpNewDrv->lpPrevItem = lpDrv;
 233     }
 234
 235     LeaveCriticalSection( &mmdriver_lock );
 236     return TRUE;
 237 }
 238
 239 /**************************************************************************
 240  *                              DRIVER_GetLibName               [internal]
 241  *
 242  */
 243 BOOL    DRIVER_GetLibName(LPCWSTR keyName, LPCWSTR sectName, LPWSTR buf, int sz)
 244 {
 245     HKEY        hKey, hSecKey;
 246     DWORD       bufLen, lRet;
 247
 248     TRACE("registry: %s, %s, %p, %d\n", debugstr_w(keyName), debugstr_w(sectName), buf, sz);
 249
 250     lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE, L"Software\\Microsoft\\Windows NT\\CurrentVersion",
 251                          0, KEY_QUERY_VALUE, &hKey);
 252     if (lRet == ERROR_SUCCESS) {
 253         lRet = RegOpenKeyExW(hKey, sectName, 0, KEY_QUERY_VALUE, &hSecKey);
 254         if (lRet == ERROR_SUCCESS) {
 255             bufLen = sz;
 256             lRet = RegQueryValueExW(hSecKey, keyName, 0, 0, (void*)buf, &bufLen);
 257             RegCloseKey( hSecKey );
 258         }
 259         RegCloseKey( hKey );
 260     }
 261     if (lRet == ERROR_SUCCESS) return TRUE;
 262
 263     /* default to system.ini if we can't find it in the registry,
 264      * to support native installations where system.ini is still used */
 265     TRACE("system.ini: %s, %s, %p, %d\n", debugstr_w(keyName), debugstr_w(sectName), buf, sz);
 266     return GetPrivateProfileStringW(sectName, keyName, L"", buf, sz / sizeof(WCHAR), L"SYSTEM.INI");
 267 }
 268
 269 /**************************************************************************
 270  *                              DRIVER_TryOpenDriver32          [internal]
 271  *
 272  * Tries to load a 32 bit driver whose DLL's (module) name is fn
 273  */
 274 LPWINE_DRIVER   DRIVER_TryOpenDriver32(LPCWSTR fn, LPARAM lParam2)
 275 {
 276     LPWINE_DRIVER       lpDrv = NULL;
 277     HMODULE             hModule = 0;
 278     LPWSTR              ptr;
 279     LPCSTR              cause = 0;
 280
 281     TRACE("(%s, %08IX);\n", debugstr_w(fn), lParam2);
 282
 283     if ((ptr = wcschr(fn, ' ')) != NULL) {
 284         *ptr++ = '\0';
 285         while (*ptr == ' ') ptr++;
 286         if (*ptr == '\0') ptr = NULL;
 287     }
 288
 289     lpDrv = HeapAlloc(GetProcessHeap(), 0, sizeof(WINE_DRIVER));
 290     if (lpDrv == NULL) {cause = "OOM"; goto exit;}
 291
 292     if ((hModule = LoadLibraryW(fn)) == 0) {cause = "Not a 32 bit lib"; goto exit;}
 293
 294     lpDrv->lpDrvProc = (DRIVERPROC)GetProcAddress(hModule, "DriverProc");
 295     if (lpDrv->lpDrvProc == NULL) {cause = "no DriverProc"; goto exit;}
 296
 297     lpDrv->dwFlags    = 0;
 298     lpDrv->hModule    = hModule;
 299     lpDrv->dwDriverID = 0;
 300
 301     /* Win32 installable drivers must support a two phase opening scheme:
 302      * + first open with NULL as lParam2 (session instance),
 303      * + then do a second open with the real non null lParam2)
 304      */
 305     if (DRIVER_GetNumberOfModuleRefs(lpDrv->hModule, NULL) == 0 && lParam2)
 306     {
 307         LPWINE_DRIVER   ret;
 308
 309         if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, 0L))
 310         {
 311             cause = "load0 failed";
 312             goto exit;
 313         }
 314         ret = DRIVER_TryOpenDriver32(fn, lParam2);
 315         if (!ret)
 316         {
 317             CloseDriver((HDRVR)lpDrv, 0L, 0L);
 318             cause = "load1 failed";
 319             goto exit;
 320         }
 321         lpDrv->dwFlags |= WINE_GDF_SESSION;
 322         return ret;
 323     }
 324
 325     if (!DRIVER_AddToList(lpDrv, (LPARAM)ptr, lParam2))
 326     {cause = "load failed"; goto exit;}
 327
 328     TRACE("=> %p\n", lpDrv);
 329     return lpDrv;
 330  exit:
 331     FreeLibrary(hModule);
 332     HeapFree(GetProcessHeap(), 0, lpDrv);
 333     TRACE("Unable to load 32 bit module %s: %s\n", debugstr_w(fn), cause);
 334     return NULL;
 335 }
 336
 337 /**************************************************************************
 338  *                              OpenDriverA                     [WINMM.@]
 339  *                              DrvOpenA                        [WINMM.@]
 340  * (0,1,DRV_LOAD  ,0       ,0)
 341  * (0,1,DRV_ENABLE,0       ,0)
 342  * (0,1,DRV_OPEN  ,buf[256],0)
 343  */
 344 HDRVR WINAPI OpenDriverA(LPCSTR lpDriverName, LPCSTR lpSectionName, LPARAM lParam)
 345 {
 346     INT                 len;
 347     LPWSTR              dn = NULL;
 348     LPWSTR              sn = NULL;
 349     HDRVR               ret = 0;
 350
 351     if (lpDriverName)
 352     {
 353         len = MultiByteToWideChar( CP_ACP, 0, lpDriverName, -1, NULL, 0 );
 354         dn = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 355         if (!dn) goto done;
 356         MultiByteToWideChar( CP_ACP, 0, lpDriverName, -1, dn, len );
 357     }
 358
 359     if (lpSectionName)
 360     {
 361         len = MultiByteToWideChar( CP_ACP, 0, lpSectionName, -1, NULL, 0 );
 362         sn = HeapAlloc( GetProcessHeap(), 0, len * sizeof(WCHAR) );
 363         if (!sn) goto done;
 364         MultiByteToWideChar( CP_ACP, 0, lpSectionName, -1, sn, len );
 365     }
 366
 367     ret = OpenDriver(dn, sn, lParam);
 368
 369 done:
 370     HeapFree(GetProcessHeap(), 0, dn);
 371     HeapFree(GetProcessHeap(), 0, sn);
 372     return ret;
 373 }
 374
 375 /**************************************************************************
 376  *                              OpenDriver                      [WINMM.@]
 377  *                              DrvOpen                         [WINMM.@]
 378  */
 379 HDRVR WINAPI OpenDriver(LPCWSTR lpDriverName, LPCWSTR lpSectionName, LPARAM lParam)
 380 {
 381     LPWINE_DRIVER       lpDrv = NULL;
 382     WCHAR               libName[MAX_PATH + 1];
 383     LPCWSTR             lsn = lpSectionName;
 384
 385     TRACE("(%s, %s, 0x%08Ix);\n",
 386           debugstr_w(lpDriverName), debugstr_w(lpSectionName), lParam);
 387
 388     DRIVER_Dump("BEFORE:");
 389
 390     if (lsn == NULL) {
 391         lstrcpynW(libName, lpDriverName, ARRAY_SIZE(libName));
 392
 393         if ((lpDrv = DRIVER_TryOpenDriver32(libName, lParam)))
 394             goto the_end;
 395         lsn = L"Drivers32";
 396     }
 397     if (DRIVER_GetLibName(lpDriverName, lsn, libName, sizeof(libName)) &&
 398         (lpDrv = DRIVER_TryOpenDriver32(libName, lParam)))
 399         goto the_end;
 400
 401     TRACE("Failed to open driver %s from system.ini file, section %s\n",
 402           debugstr_w(lpDriverName), debugstr_w(lpSectionName));
 403
 404 the_end:
 405     TRACE("=> %p\n", lpDrv);
 406
 407     DRIVER_Dump("AFTER:");
 408
 409     return (HDRVR)lpDrv;
 410 }
 411
 412 /**************************************************************************
 413  *                      CloseDriver                             [WINMM.@]
 414  *                      DrvClose                                [WINMM.@]
 415  */
 416 LRESULT WINAPI CloseDriver(HDRVR hDrvr, LPARAM lParam1, LPARAM lParam2)
 417 {
 418     BOOL ret;
 419     LPWINE_DRIVER       lpDrv;
 420
 421     TRACE("(%p, %08IX, %08IX);\n", hDrvr, lParam1, lParam2);
 422
 423     DRIVER_Dump("BEFORE:");
 424
 425     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL)
 426     {
 427         LPWINE_DRIVER lpDrv0;
 428
 429         DRIVER_SendMessage(lpDrv, DRV_CLOSE, lParam1, lParam2);
 430
 431         DRIVER_RemoveFromList(lpDrv);
 432
 433         if (lpDrv->dwFlags & WINE_GDF_SESSION)
 434             FIXME("WINE_GDF_SESSION: Shouldn't happen (%p)\n", lpDrv);
 435         /* if driver has an opened session instance, we have to close it too */
 436         if (DRIVER_GetNumberOfModuleRefs(lpDrv->hModule, &lpDrv0) == 1 &&
 437             (lpDrv0->dwFlags & WINE_GDF_SESSION))
 438         {
 439             DRIVER_SendMessage(lpDrv0, DRV_CLOSE, 0, 0);
 440             DRIVER_RemoveFromList(lpDrv0);
 441             FreeLibrary(lpDrv0->hModule);
 442             HeapFree(GetProcessHeap(), 0, lpDrv0);
 443         }
 444         FreeLibrary(lpDrv->hModule);
 445
 446         HeapFree(GetProcessHeap(), 0, lpDrv);
 447         ret = TRUE;
 448     }
 449     else
 450     {
 451         WARN("Failed to close driver\n");
 452         ret = FALSE;
 453     }
 454
 455     DRIVER_Dump("AFTER:");
 456
 457     return ret;
 458 }
 459
 460 /**************************************************************************
 461  *                              GetDriverFlags          [WINMM.@]
 462  * [in] hDrvr handle to the driver
 463  *
 464  * Returns:
 465  *      0x00000000 if hDrvr is an invalid handle
 466  *      0x80000000 if hDrvr is a valid 32 bit driver
 467  *      0x90000000 if hDrvr is a valid 16 bit driver
 468  *
 469  * native WINMM doesn't return those flags
 470  *      0x80000000 for a valid 32 bit driver and that's it
 471  *      (I may have mixed up the two flags :-(
 472  */
 473 DWORD   WINAPI GetDriverFlags(HDRVR hDrvr)
 474 {
 475     LPWINE_DRIVER       lpDrv;
 476     DWORD               ret = 0;
 477
 478     TRACE("(%p)\n", hDrvr);
 479
 480     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
 481         ret = WINE_GDF_EXIST | (lpDrv->dwFlags & WINE_GDF_EXTERNAL_MASK);
 482     }
 483     return ret;
 484 }
 485
 486 /**************************************************************************
 487  *                              GetDriverModuleHandle   [WINMM.@]
 488  *                              DrvGetModuleHandle      [WINMM.@]
 489  */
 490 HMODULE WINAPI GetDriverModuleHandle(HDRVR hDrvr)
 491 {
 492     LPWINE_DRIVER       lpDrv;
 493     HMODULE             hModule = 0;
 494
 495     TRACE("(%p);\n", hDrvr);
 496
 497     if ((lpDrv = DRIVER_FindFromHDrvr(hDrvr)) != NULL) {
 498         hModule = lpDrv->hModule;
 499     }
 500     TRACE("=> %p\n", hModule);
 501     return hModule;
 502 }
 503
 504 /**************************************************************************
 505  *                              DefDriverProc                     [WINMM.@]
 506  *                              DrvDefDriverProc                  [WINMM.@]
 507  */
 508 LRESULT WINAPI DefDriverProc(DWORD_PTR dwDriverIdentifier, HDRVR hDrv,
 509                              UINT Msg, LPARAM lParam1, LPARAM lParam2)
 510 {
 511     switch (Msg) {
 512     case DRV_LOAD:
 513     case DRV_FREE:
 514     case DRV_ENABLE:
 515     case DRV_DISABLE:
 516         return 1;
 517     case DRV_INSTALL:
 518     case DRV_REMOVE:
 519         return DRV_SUCCESS;
 520     default:
 521         return 0;
 522     }
 523 }
 524
 525 /**************************************************************************
 526  *                              DRIVER_getCallback              [internal]
 527  */
 528 static const char* DRIVER_getCallback(DWORD uFlags)
 529 {
 530     switch(uFlags & DCB_TYPEMASK) {
 531     case DCB_NULL:     return "null";
 532     case DCB_WINDOW:   return "window";
 533     case DCB_TASK:     return "task";
 534     case DCB_EVENT:    return "event";
 535     case DCB_FUNCTION: return "32bit function";
 536     default:           return "UNKNOWN";
 537     }
 538 }
 539
 540 /**************************************************************************
 541  *                              DriverCallback                  [WINMM.@]
 542  */
 543 BOOL WINAPI DriverCallback(DWORD_PTR dwCallBack, DWORD uFlags, HDRVR hDev,
 544                            DWORD wMsg, DWORD_PTR dwUser, DWORD_PTR dwParam1,
 545                            DWORD_PTR dwParam2)
 546 {
 547     BOOL ret = FALSE;
 548     TRACE("(%08IX, %s %04lX, %p, %04lX, %08IX, %08IX, %08IX)\n",
 549           dwCallBack, DRIVER_getCallback(uFlags), uFlags, hDev, wMsg, dwUser, dwParam1, dwParam2);
 550     if (!dwCallBack)
 551         return ret;
 552
 553     switch (uFlags & DCB_TYPEMASK) {
 554     case DCB_NULL:
 555         /* Native returns FALSE = no notification, not TRUE */
 556         return ret;
 557     case DCB_WINDOW:
 558         ret = PostMessageA((HWND)dwCallBack, wMsg, (WPARAM)hDev, dwParam1);
 559         break;
 560     case DCB_TASK: /* aka DCB_THREAD */
 561         ret = PostThreadMessageA(dwCallBack, wMsg, (WPARAM)hDev, dwParam1);
 562         break;
 563     case DCB_FUNCTION:
 564         ((LPDRVCALLBACK)dwCallBack)(hDev, wMsg, dwUser, dwParam1, dwParam2);
 565         ret = TRUE;
 566         break;
 567     case DCB_EVENT:
 568         ret = SetEvent((HANDLE)dwCallBack);
 569         break;
 570 #if 0
 571         /* FIXME: for now only usable in mmsystem.dll16
 572          * If needed, should be enabled back
 573          */
 574     case 6: /* I would dub it DCB_MMTHREADSIGNAL */
 575         /* this is an undocumented DCB_ value used for mmThreads
 576          * loword of dwCallBack contains the handle of the lpMMThd block
 577          * which dwSignalCount has to be incremented
 578          */
 579         if (pFnGetMMThread16)
 580         {
 581             WINE_MMTHREAD*      lpMMThd = pFnGetMMThread16(LOWORD(dwCallBack));
 582
 583             TRACE("mmThread (%04x, %p) !\n", LOWORD(dwCallBack), lpMMThd);
 584             /* same as mmThreadSignal16 */
 585             InterlockedIncrement(&lpMMThd->dwSignalCount);
 586             SetEvent(lpMMThd->hEvent);
 587             /* some other stuff on lpMMThd->hVxD */
 588         }
 589         break;
 590 #endif
 591 #if 0
 592     case 4:
 593         /* this is an undocumented DCB_ value for... I don't know */
 594         break;
 595 #endif
 596     default:
 597         WARN("Unknown callback type %ld\n", uFlags & DCB_TYPEMASK);
 598         return FALSE;
 599     }
 600     if (ret)
 601         TRACE("Done\n");
 602     else
 603         WARN("Notification failure\n");
 604     return ret;
 605 }
 606
 607 /******************************************************************
 608  *              DRIVER_UnloadAll
 609  *
 610  *
 611  */
 612 void    DRIVER_UnloadAll(void)
 613 {
 614     LPWINE_DRIVER       lpDrv;
 615     LPWINE_DRIVER       lpNextDrv = NULL;
 616     unsigned            count = 0;
 617
 618 restart:
 619     EnterCriticalSection( &mmdriver_lock );
 620
 621     for (lpDrv = lpDrvItemList; lpDrv != NULL; lpDrv = lpNextDrv)
 622     {
 623         lpNextDrv = lpDrv->lpNextItem;
 624
 625         /* session instances will be unloaded automatically */
 626         if (!(lpDrv->dwFlags & WINE_GDF_SESSION))
 627         {
 628             LeaveCriticalSection( &mmdriver_lock );
 629             CloseDriver((HDRVR)lpDrv, 0, 0);
 630             count++;
 631             /* restart from the beginning of the list */
 632             goto restart;
 633         }
 634     }
 635
 636     LeaveCriticalSection( &mmdriver_lock );
 637
 638     TRACE("Unloaded %u drivers\n", count);
 639 }