dlls/user32/hook.c

   1 /*
   2  * Windows hook functions
   3  *
   4  * Copyright 2002 Alexandre Julliard
   5  * Copyright 2005 Dmitry Timoshkov
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  * NOTES:
  22  *   Status of the various hooks:
  23  *     WH_MSGFILTER                 OK
  24  *     WH_JOURNALRECORD             Partially implemented
  25  *     WH_JOURNALPLAYBACK           Partially implemented
  26  *     WH_KEYBOARD                  OK
  27  *     WH_GETMESSAGE                OK (FIXME: A/W mapping?)
  28  *     WH_CALLWNDPROC               OK (FIXME: A/W mapping?)
  29  *     WH_CBT
  30  *       HCBT_MOVESIZE              OK
  31  *       HCBT_MINMAX                OK
  32  *       HCBT_QS                    OK
  33  *       HCBT_CREATEWND             OK
  34  *       HCBT_DESTROYWND            OK
  35  *       HCBT_ACTIVATE              OK
  36  *       HCBT_CLICKSKIPPED          OK
  37  *       HCBT_KEYSKIPPED            OK
  38  *       HCBT_SYSCOMMAND            OK
  39  *       HCBT_SETFOCUS              OK
  40  *     WH_SYSMSGFILTER              OK
  41  *     WH_MOUSE                     OK
  42  *     WH_HARDWARE                  Not supported in Win32
  43  *     WH_DEBUG                     Not implemented
  44  *     WH_SHELL
  45  *       HSHELL_WINDOWCREATED       OK
  46  *       HSHELL_WINDOWDESTROYED     OK
  47  *       HSHELL_ACTIVATESHELLWINDOW Not implemented
  48  *       HSHELL_WINDOWACTIVATED     Not implemented
  49  *       HSHELL_GETMINRECT          Not implemented
  50  *       HSHELL_REDRAW              Not implemented
  51  *       HSHELL_TASKMAN             Not implemented
  52  *       HSHELL_LANGUAGE            Not implemented
  53  *       HSHELL_SYSMENU             Not implemented
  54  *       HSHELL_ENDTASK             Not implemented
  55  *       HSHELL_ACCESSIBILITYSTATE  Not implemented
  56  *       HSHELL_APPCOMMAND          Not implemented
  57  *       HSHELL_WINDOWREPLACED      Not implemented
  58  *       HSHELL_WINDOWREPLACING     Not implemented
  59  *     WH_FOREGROUNDIDLE            Not implemented
  60  *     WH_CALLWNDPROCRET            OK (FIXME: A/W mapping?)
  61  *     WH_KEYBOARD_LL               Implemented but should use SendMessage instead
  62  *     WH_MOUSE_LL                  Implemented but should use SendMessage instead
  63  */
  64
  65 #include "config.h"
  66 #include "wine/port.h"
  67
  68 #include <stdarg.h>
  69 #include <assert.h>
  70
  71 #include "windef.h"
  72 #include "winbase.h"
  73 #include "wingdi.h"
  74 #include "winuser.h"
  75 #include "winerror.h"
  76 #include "win.h"
  77 #include "user_private.h"
  78 #include "wine/server.h"
  79 #include "wine/unicode.h"
  80 #include "wine/debug.h"
  81 #include "winternl.h"
  82
  83 WINE_DEFAULT_DEBUG_CHANNEL(hook);
  84 WINE_DECLARE_DEBUG_CHANNEL(relay);
  85
  86 struct hook_info
  87 {
  88     INT id;
  89     void *proc;
  90     void *handle;
  91     DWORD pid, tid;
  92     BOOL prev_unicode, next_unicode;
  93     WCHAR module[MAX_PATH];
  94 };
  95
  96 #define WH_WINEVENT (WH_MAXHOOK+1)
  97
  98 static const char * const hook_names[WH_WINEVENT - WH_MINHOOK + 1] =
  99 {
 100     "WH_MSGFILTER",
 101     "WH_JOURNALRECORD",
 102     "WH_JOURNALPLAYBACK",
 103     "WH_KEYBOARD",
 104     "WH_GETMESSAGE",
 105     "WH_CALLWNDPROC",
 106     "WH_CBT",
 107     "WH_SYSMSGFILTER",
 108     "WH_MOUSE",
 109     "WH_HARDWARE",
 110     "WH_DEBUG",
 111     "WH_SHELL",
 112     "WH_FOREGROUNDIDLE",
 113     "WH_CALLWNDPROCRET",
 114     "WH_KEYBOARD_LL",
 115     "WH_MOUSE_LL",
 116     "WH_WINEVENT"
 117 };
 118
 119
 120 /***********************************************************************
 121  *              get_ll_hook_timeout
 122  *
 123  */
 124 static UINT get_ll_hook_timeout(void)
 125 {
 126     /* FIXME: should retrieve LowLevelHooksTimeout in HKEY_CURRENT_USER\Control Panel\Desktop */
 127     return 2000;
 128 }
 129
 130
 131 /***********************************************************************
 132  *              set_windows_hook
 133  *
 134  * Implementation of SetWindowsHookExA and SetWindowsHookExW.
 135  */
 136 static HHOOK set_windows_hook( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid, BOOL unicode )
 137 {
 138     HHOOK handle = 0;
 139     WCHAR module[MAX_PATH];
 140     DWORD len;
 141
 142     if (!proc)
 143     {
 144         SetLastError( ERROR_INVALID_FILTER_PROC );
 145         return 0;
 146     }
 147
 148     if (tid)  /* thread-local hook */
 149     {
 150         if (id == WH_JOURNALRECORD ||
 151             id == WH_JOURNALPLAYBACK ||
 152             id == WH_KEYBOARD_LL ||
 153             id == WH_MOUSE_LL ||
 154             id == WH_SYSMSGFILTER)
 155         {
 156             /* these can only be global */
 157             SetLastError( ERROR_INVALID_PARAMETER );
 158             return 0;
 159         }
 160     }
 161     else  /* system-global hook */
 162     {
 163         if (id == WH_KEYBOARD_LL || id == WH_MOUSE_LL) inst = 0;
 164         else if (!inst)
 165         {
 166             SetLastError( ERROR_HOOK_NEEDS_HMOD );
 167             return 0;
 168         }
 169     }
 170
 171     if (inst && (!(len = GetModuleFileNameW( inst, module, MAX_PATH )) || len >= MAX_PATH))
 172     {
 173         SetLastError( ERROR_INVALID_PARAMETER );
 174         return 0;
 175     }
 176
 177     SERVER_START_REQ( set_hook )
 178     {
 179         req->id        = id;
 180         req->pid       = 0;
 181         req->tid       = tid;
 182         req->event_min = EVENT_MIN;
 183         req->event_max = EVENT_MAX;
 184         req->flags     = WINEVENT_INCONTEXT;
 185         req->unicode   = unicode;
 186         if (inst) /* make proc relative to the module base */
 187         {
 188             req->proc = wine_server_client_ptr( (void *)((char *)proc - (char *)inst) );
 189             wine_server_add_data( req, module, strlenW(module) * sizeof(WCHAR) );
 190         }
 191         else req->proc = wine_server_client_ptr( proc );
 192
 193         if (!wine_server_call_err( req ))
 194         {
 195             handle = wine_server_ptr_handle( reply->handle );
 196             get_user_thread_info()->active_hooks = reply->active_hooks;
 197         }
 198     }
 199     SERVER_END_REQ;
 200
 201     TRACE( "%s %p %x -> %p\n", hook_names[id-WH_MINHOOK], proc, tid, handle );
 202     return handle;
 203 }
 204
 205 #ifdef __i386__
 206 /* Some apps pass a non-stdcall proc to SetWindowsHookExA,
 207  * so we need a small assembly wrapper to call the proc.
 208  */
 209 extern LRESULT HOOKPROC_wrapper( HOOKPROC proc,
 210                                  INT code, WPARAM wParam, LPARAM lParam );
 211 __ASM_GLOBAL_FUNC( HOOKPROC_wrapper,
 212                    "pushl %ebp\n\t"
 213                    __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
 214                    __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
 215                    "movl %esp,%ebp\n\t"
 216                    __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
 217                    "pushl %edi\n\t"
 218                    __ASM_CFI(".cfi_rel_offset %edi,-4\n\t")
 219                    "pushl %esi\n\t"
 220                    __ASM_CFI(".cfi_rel_offset %esi,-8\n\t")
 221                    "pushl %ebx\n\t"
 222                    __ASM_CFI(".cfi_rel_offset %ebx,-12\n\t")
 223                    "pushl 20(%ebp)\n\t"
 224                    "pushl 16(%ebp)\n\t"
 225                    "pushl 12(%ebp)\n\t"
 226                    "movl 8(%ebp),%eax\n\t"
 227                    "call *%eax\n\t"
 228                    "leal -12(%ebp),%esp\n\t"
 229                    "popl %ebx\n\t"
 230                    __ASM_CFI(".cfi_same_value %ebx\n\t")
 231                    "popl %esi\n\t"
 232                    __ASM_CFI(".cfi_same_value %esi\n\t")
 233                    "popl %edi\n\t"
 234                    __ASM_CFI(".cfi_same_value %edi\n\t")
 235                    "leave\n\t"
 236                    __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
 237                    __ASM_CFI(".cfi_same_value %ebp\n\t")
 238                    "ret" )
 239 #else
 240 static inline LRESULT HOOKPROC_wrapper( HOOKPROC proc,
 241                                  INT code, WPARAM wParam, LPARAM lParam )
 242 {
 243     return proc( code, wParam, lParam );
 244 }
 245 #endif  /* __i386__ */
 246
 247
 248 /***********************************************************************
 249  *              call_hook_AtoW
 250  */
 251 static LRESULT call_hook_AtoW( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 252 {
 253     LRESULT ret;
 254     UNICODE_STRING usBuffer;
 255     if (id != WH_CBT || code != HCBT_CREATEWND)
 256         ret = HOOKPROC_wrapper( proc, code, wparam, lparam );
 257     else
 258     {
 259         CBT_CREATEWNDA *cbtcwA = (CBT_CREATEWNDA *)lparam;
 260         CBT_CREATEWNDW cbtcwW;
 261         CREATESTRUCTW csW;
 262         LPWSTR nameW = NULL;
 263         LPWSTR classW = NULL;
 264
 265         cbtcwW.lpcs = &csW;
 266         cbtcwW.hwndInsertAfter = cbtcwA->hwndInsertAfter;
 267         csW = *(CREATESTRUCTW *)cbtcwA->lpcs;
 268
 269         if (!IS_INTRESOURCE(cbtcwA->lpcs->lpszName))
 270         {
 271             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszName);
 272             csW.lpszName = nameW = usBuffer.Buffer;
 273         }
 274         if (!IS_INTRESOURCE(cbtcwA->lpcs->lpszClass))
 275         {
 276             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszClass);
 277             csW.lpszClass = classW = usBuffer.Buffer;
 278         }
 279         ret = HOOKPROC_wrapper( proc, code, wparam, (LPARAM)&cbtcwW );
 280         cbtcwA->hwndInsertAfter = cbtcwW.hwndInsertAfter;
 281         HeapFree( GetProcessHeap(), 0, nameW );
 282         HeapFree( GetProcessHeap(), 0, classW );
 283     }
 284     return ret;
 285 }
 286
 287
 288 /***********************************************************************
 289  *              call_hook_WtoA
 290  */
 291 static LRESULT call_hook_WtoA( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 292 {
 293     LRESULT ret;
 294
 295     if (id != WH_CBT || code != HCBT_CREATEWND)
 296         ret = HOOKPROC_wrapper( proc, code, wparam, lparam );
 297     else
 298     {
 299         CBT_CREATEWNDW *cbtcwW = (CBT_CREATEWNDW *)lparam;
 300         CBT_CREATEWNDA cbtcwA;
 301         CREATESTRUCTA csA;
 302         int len;
 303         LPSTR nameA = NULL;
 304         LPSTR classA = NULL;
 305
 306         cbtcwA.lpcs = &csA;
 307         cbtcwA.hwndInsertAfter = cbtcwW->hwndInsertAfter;
 308         csA = *(CREATESTRUCTA *)cbtcwW->lpcs;
 309
 310         if (!IS_INTRESOURCE(cbtcwW->lpcs->lpszName)) {
 311             len = WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszName, -1, NULL, 0, NULL, NULL );
 312             nameA = HeapAlloc( GetProcessHeap(), 0, len*sizeof(CHAR) );
 313             WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszName, -1, nameA, len, NULL, NULL );
 314             csA.lpszName = nameA;
 315         }
 316
 317         if (!IS_INTRESOURCE(cbtcwW->lpcs->lpszClass)) {
 318             len = WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszClass, -1, NULL, 0, NULL, NULL );
 319             classA = HeapAlloc( GetProcessHeap(), 0, len*sizeof(CHAR) );
 320             WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszClass, -1, classA, len, NULL, NULL );
 321             csA.lpszClass = classA;
 322         }
 323
 324         ret = HOOKPROC_wrapper( proc, code, wparam, (LPARAM)&cbtcwA );
 325         cbtcwW->hwndInsertAfter = cbtcwA.hwndInsertAfter;
 326         HeapFree( GetProcessHeap(), 0, nameA );
 327         HeapFree( GetProcessHeap(), 0, classA );
 328     }
 329     return ret;
 330 }
 331
 332
 333 /***********************************************************************
 334  *              call_hook_proc
 335  */
 336 static LRESULT call_hook_proc( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam,
 337                                BOOL prev_unicode, BOOL next_unicode )
 338 {
 339     LRESULT ret;
 340
 341     TRACE_(relay)( "\1Call hook proc %p (id=%s,code=%x,wp=%08lx,lp=%08lx)\n",
 342                    proc, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 343
 344     if (!prev_unicode == !next_unicode) ret = proc( code, wparam, lparam );
 345     else if (prev_unicode) ret = call_hook_WtoA( proc, id, code, wparam, lparam );
 346     else ret = call_hook_AtoW( proc, id, code, wparam, lparam );
 347
 348     TRACE_(relay)( "\1Ret  hook proc %p (id=%s,code=%x,wp=%08lx,lp=%08lx) retval=%08lx\n",
 349                    proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, ret );
 350
 351     return ret;
 352 }
 353
 354
 355 /***********************************************************************
 356  *              get_hook_proc
 357  *
 358  * Retrieve the hook procedure real value for a module-relative proc
 359  */
 360 void *get_hook_proc( void *proc, const WCHAR *module, HMODULE *free_module )
 361 {
 362     HMODULE mod;
 363
 364     GetModuleHandleExW( 0, module, &mod );
 365     *free_module = mod;
 366     if (!mod)
 367     {
 368         TRACE( "loading %s\n", debugstr_w(module) );
 369         /* FIXME: the library will never be freed */
 370         if (!(mod = LoadLibraryExW(module, NULL, LOAD_WITH_ALTERED_SEARCH_PATH))) return NULL;
 371     }
 372     return (char *)mod + (ULONG_PTR)proc;
 373 }
 374
 375 /***********************************************************************
 376  *              call_hook
 377  *
 378  * Call hook either in current thread or send message to the destination
 379  * thread.
 380  */
 381 static LRESULT call_hook( struct hook_info *info, INT code, WPARAM wparam, LPARAM lparam )
 382 {
 383     DWORD_PTR ret = 0;
 384
 385     if (info->tid)
 386     {
 387         struct hook_extra_info h_extra;
 388         h_extra.handle = info->handle;
 389         h_extra.lparam = lparam;
 390
 391         TRACE( "calling hook in thread %04x %s code %x wp %lx lp %lx\n",
 392                info->tid, hook_names[info->id-WH_MINHOOK], code, wparam, lparam );
 393
 394         switch(info->id)
 395         {
 396         case WH_KEYBOARD_LL:
 397             MSG_SendInternalMessageTimeout( info->pid, info->tid, WM_WINE_KEYBOARD_LL_HOOK,
 398                                             wparam, (LPARAM)&h_extra, SMTO_ABORTIFHUNG,
 399                                             get_ll_hook_timeout(), &ret );
 400             break;
 401         case WH_MOUSE_LL:
 402             MSG_SendInternalMessageTimeout( info->pid, info->tid, WM_WINE_MOUSE_LL_HOOK,
 403                                             wparam, (LPARAM)&h_extra, SMTO_ABORTIFHUNG,
 404                                             get_ll_hook_timeout(), &ret );
 405             break;
 406         default:
 407             ERR("Unknown hook id %d\n", info->id);
 408             assert(0);
 409             break;
 410         }
 411     }
 412     else if (info->proc)
 413     {
 414         struct user_thread_info *thread_info = get_user_thread_info();
 415         HMODULE free_module = 0;
 416
 417         /*
 418          * Windows protects from stack overflow in recursive hook calls. Different Windows
 419          * allow different depths.
 420          */
 421         if (thread_info->hook_call_depth >= 25)
 422         {
 423             WARN("Too many hooks called recursively, skipping call.\n");
 424             return 0;
 425         }
 426
 427         TRACE( "calling hook %p %s code %x wp %lx lp %lx module %s\n",
 428                info->proc, hook_names[info->id-WH_MINHOOK], code, wparam,
 429                lparam, debugstr_w(info->module) );
 430
 431         if (!info->module[0] ||
 432             (info->proc = get_hook_proc( info->proc, info->module, &free_module )) != NULL)
 433         {
 434             HHOOK prev = thread_info->hook;
 435             BOOL prev_unicode = thread_info->hook_unicode;
 436
 437             thread_info->hook = info->handle;
 438             thread_info->hook_unicode = info->next_unicode;
 439             thread_info->hook_call_depth++;
 440             ret = call_hook_proc( info->proc, info->id, code, wparam, lparam,
 441                                   info->prev_unicode, info->next_unicode );
 442             thread_info->hook = prev;
 443             thread_info->hook_unicode = prev_unicode;
 444             thread_info->hook_call_depth--;
 445
 446             if (free_module) FreeLibrary(free_module);
 447         }
 448     }
 449
 450     if (info->id == WH_KEYBOARD_LL || info->id == WH_MOUSE_LL)
 451         interlocked_xchg_add( &global_key_state_counter, 1 );  /* force refreshing the key state cache */
 452
 453     return ret;
 454 }
 455
 456
 457 /***********************************************************************
 458  *           HOOK_IsHooked
 459  */
 460 static BOOL HOOK_IsHooked( INT id )
 461 {
 462     struct user_thread_info *thread_info = get_user_thread_info();
 463
 464     if (!thread_info->active_hooks) return TRUE;
 465     return (thread_info->active_hooks & (1 << (id - WH_MINHOOK))) != 0;
 466 }
 467
 468
 469 /***********************************************************************
 470  *              HOOK_CallHooks
 471  */
 472 LRESULT HOOK_CallHooks( INT id, INT code, WPARAM wparam, LPARAM lparam, BOOL unicode )
 473 {
 474     struct user_thread_info *thread_info = get_user_thread_info();
 475     struct hook_info info;
 476     DWORD_PTR ret;
 477
 478     USER_CheckNotLock();
 479
 480     if (!HOOK_IsHooked( id ))
 481     {
 482         TRACE( "skipping hook %s mask %x\n", hook_names[id-WH_MINHOOK], thread_info->active_hooks );
 483         return 0;
 484     }
 485
 486     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 487     info.prev_unicode = unicode;
 488     info.id = id;
 489
 490     SERVER_START_REQ( start_hook_chain )
 491     {
 492         req->id = info.id;
 493         req->event = EVENT_MIN;
 494         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 495         if (!wine_server_call( req ))
 496         {
 497             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 498             info.handle       = wine_server_ptr_handle( reply->handle );
 499             info.pid          = reply->pid;
 500             info.tid          = reply->tid;
 501             info.proc         = wine_server_get_ptr( reply->proc );
 502             info.next_unicode = reply->unicode;
 503             thread_info->active_hooks = reply->active_hooks;
 504         }
 505     }
 506     SERVER_END_REQ;
 507
 508     if (!info.tid && !info.proc) return 0;
 509     ret = call_hook( &info, code, wparam, lparam );
 510
 511     SERVER_START_REQ( finish_hook_chain )
 512     {
 513         req->id = id;
 514         wine_server_call( req );
 515     }
 516     SERVER_END_REQ;
 517     return ret;
 518 }
 519
 520
 521 /***********************************************************************
 522  *              SetWindowsHookA (USER32.@)
 523  */
 524 HHOOK WINAPI SetWindowsHookA( INT id, HOOKPROC proc )
 525 {
 526     return SetWindowsHookExA( id, proc, 0, GetCurrentThreadId() );
 527 }
 528
 529
 530 /***********************************************************************
 531  *              SetWindowsHookW (USER32.@)
 532  */
 533 HHOOK WINAPI SetWindowsHookW( INT id, HOOKPROC proc )
 534 {
 535     return SetWindowsHookExW( id, proc, 0, GetCurrentThreadId() );
 536 }
 537
 538
 539 /***********************************************************************
 540  *              SetWindowsHookExA (USER32.@)
 541  */
 542 HHOOK WINAPI SetWindowsHookExA( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 543 {
 544     return set_windows_hook( id, proc, inst, tid, FALSE );
 545 }
 546
 547 /***********************************************************************
 548  *              SetWindowsHookExW (USER32.@)
 549  */
 550 HHOOK WINAPI SetWindowsHookExW( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 551 {
 552     return set_windows_hook( id, proc, inst, tid, TRUE );
 553 }
 554
 555
 556 /***********************************************************************
 557  *              UnhookWindowsHook (USER32.@)
 558  */
 559 BOOL WINAPI UnhookWindowsHook( INT id, HOOKPROC proc )
 560 {
 561     BOOL ret;
 562
 563     TRACE( "%s %p\n", hook_names[id-WH_MINHOOK], proc );
 564
 565     SERVER_START_REQ( remove_hook )
 566     {
 567         req->handle = 0;
 568         req->id   = id;
 569         req->proc = wine_server_client_ptr( proc );
 570         ret = !wine_server_call_err( req );
 571         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 572     }
 573     SERVER_END_REQ;
 574     if (!ret && GetLastError() == ERROR_INVALID_HANDLE) SetLastError( ERROR_INVALID_HOOK_HANDLE );
 575     return ret;
 576 }
 577
 578
 579
 580 /***********************************************************************
 581  *              UnhookWindowsHookEx (USER32.@)
 582  */
 583 BOOL WINAPI UnhookWindowsHookEx( HHOOK hhook )
 584 {
 585     BOOL ret;
 586
 587     SERVER_START_REQ( remove_hook )
 588     {
 589         req->handle = wine_server_user_handle( hhook );
 590         req->id     = 0;
 591         ret = !wine_server_call_err( req );
 592         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 593     }
 594     SERVER_END_REQ;
 595     if (!ret && GetLastError() == ERROR_INVALID_HANDLE) SetLastError( ERROR_INVALID_HOOK_HANDLE );
 596     return ret;
 597 }
 598
 599
 600 /***********************************************************************
 601  *              CallNextHookEx (USER32.@)
 602  */
 603 LRESULT WINAPI CallNextHookEx( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam )
 604 {
 605     struct user_thread_info *thread_info = get_user_thread_info();
 606     struct hook_info info;
 607
 608     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 609
 610     SERVER_START_REQ( get_hook_info )
 611     {
 612         req->handle = wine_server_user_handle( thread_info->hook );
 613         req->get_next = 1;
 614         req->event = EVENT_MIN;
 615         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 616         if (!wine_server_call_err( req ))
 617         {
 618             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 619             info.handle       = wine_server_ptr_handle( reply->handle );
 620             info.id           = reply->id;
 621             info.pid          = reply->pid;
 622             info.tid          = reply->tid;
 623             info.proc         = wine_server_get_ptr( reply->proc );
 624             info.next_unicode = reply->unicode;
 625         }
 626     }
 627     SERVER_END_REQ;
 628
 629     info.prev_unicode = thread_info->hook_unicode;
 630     return call_hook( &info, code, wparam, lparam );
 631 }
 632
 633
 634 LRESULT call_current_hook( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam )
 635 {
 636     struct hook_info info;
 637
 638     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 639
 640     SERVER_START_REQ( get_hook_info )
 641     {
 642         req->handle = wine_server_user_handle( hhook );
 643         req->get_next = 0;
 644         req->event = EVENT_MIN;
 645         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 646         if (!wine_server_call_err( req ))
 647         {
 648             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 649             info.handle       = wine_server_ptr_handle( reply->handle );
 650             info.id           = reply->id;
 651             info.pid          = reply->pid;
 652             info.tid          = reply->tid;
 653             info.proc         = wine_server_get_ptr( reply->proc );
 654             info.next_unicode = reply->unicode;
 655         }
 656     }
 657     SERVER_END_REQ;
 658
 659     info.prev_unicode = TRUE;  /* assume Unicode for this function */
 660     return call_hook( &info, code, wparam, lparam );
 661 }
 662
 663 /***********************************************************************
 664  *              CallMsgFilterA (USER32.@)
 665  */
 666 BOOL WINAPI CallMsgFilterA( LPMSG msg, INT code )
 667 {
 668     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, FALSE )) return TRUE;
 669     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, FALSE );
 670 }
 671
 672
 673 /***********************************************************************
 674  *              CallMsgFilterW (USER32.@)
 675  */
 676 BOOL WINAPI CallMsgFilterW( LPMSG msg, INT code )
 677 {
 678     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, TRUE )) return TRUE;
 679     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, TRUE );
 680 }
 681
 682
 683 /***********************************************************************
 684  *           SetWinEventHook                            [USER32.@]
 685  *
 686  * Set up an event hook for a set of events.
 687  *
 688  * PARAMS
 689  *  event_min [I] Lowest event handled by pfnProc
 690  *  event_max [I] Highest event handled by pfnProc
 691  *  inst      [I] DLL containing pfnProc
 692  *  proc      [I] Callback event hook function
 693  *  pid       [I] Process to get events from, or 0 for all processes
 694  *  tid       [I] Thread to get events from, or 0 for all threads
 695  *  flags     [I] Flags indicating the status of pfnProc
 696  *
 697  * RETURNS
 698  *  Success: A handle representing the hook.
 699  *  Failure: A NULL handle.
 700  */
 701 HWINEVENTHOOK WINAPI SetWinEventHook(DWORD event_min, DWORD event_max,
 702                                      HMODULE inst, WINEVENTPROC proc,
 703                                      DWORD pid, DWORD tid, DWORD flags)
 704 {
 705     HWINEVENTHOOK handle = 0;
 706     WCHAR module[MAX_PATH];
 707     DWORD len;
 708
 709     TRACE("%d,%d,%p,%p,%08x,%04x,%08x\n", event_min, event_max, inst,
 710           proc, pid, tid, flags);
 711
 712     if (inst)
 713     {
 714         if (!(len = GetModuleFileNameW(inst, module, MAX_PATH)) || len >= MAX_PATH)
 715             inst = 0;
 716     }
 717
 718     if ((flags & WINEVENT_INCONTEXT) && !inst)
 719     {
 720         SetLastError(ERROR_HOOK_NEEDS_HMOD);
 721         return 0;
 722     }
 723
 724     if (event_min > event_max)
 725     {
 726         SetLastError(ERROR_INVALID_HOOK_FILTER);
 727         return 0;
 728     }
 729
 730     /* FIXME: what if the tid or pid belongs to another process? */
 731     if (tid)  /* thread-local hook */
 732         inst = 0;
 733
 734     SERVER_START_REQ( set_hook )
 735     {
 736         req->id        = WH_WINEVENT;
 737         req->pid       = pid;
 738         req->tid       = tid;
 739         req->event_min = event_min;
 740         req->event_max = event_max;
 741         req->flags     = flags;
 742         req->unicode   = 1;
 743         if (inst) /* make proc relative to the module base */
 744         {
 745             req->proc = wine_server_client_ptr( (void *)((char *)proc - (char *)inst) );
 746             wine_server_add_data( req, module, strlenW(module) * sizeof(WCHAR) );
 747         }
 748         else req->proc = wine_server_client_ptr( proc );
 749
 750         if (!wine_server_call_err( req ))
 751         {
 752             handle = wine_server_ptr_handle( reply->handle );
 753             get_user_thread_info()->active_hooks = reply->active_hooks;
 754         }
 755     }
 756     SERVER_END_REQ;
 757
 758     TRACE("-> %p\n", handle);
 759     return handle;
 760 }
 761
 762
 763 /***********************************************************************
 764  *           UnhookWinEvent                             [USER32.@]
 765  *
 766  * Remove an event hook for a set of events.
 767  *
 768  * PARAMS
 769  *  hEventHook [I] Event hook to remove
 770  *
 771  * RETURNS
 772  *  Success: TRUE. The event hook has been removed.
 773  *  Failure: FALSE, if hEventHook is invalid.
 774  */
 775 BOOL WINAPI UnhookWinEvent(HWINEVENTHOOK hEventHook)
 776 {
 777     BOOL ret;
 778
 779     SERVER_START_REQ( remove_hook )
 780     {
 781         req->handle = wine_server_user_handle( hEventHook );
 782         req->id     = WH_WINEVENT;
 783         ret = !wine_server_call_err( req );
 784         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 785     }
 786     SERVER_END_REQ;
 787     return ret;
 788 }
 789
 790 static inline BOOL find_first_hook(DWORD id, DWORD event, HWND hwnd, LONG object_id,
 791                                    LONG child_id, struct hook_info *info)
 792 {
 793     struct user_thread_info *thread_info = get_user_thread_info();
 794     BOOL ret;
 795
 796     if (!HOOK_IsHooked( id ))
 797     {
 798         TRACE( "skipping hook %s mask %x\n", hook_names[id-WH_MINHOOK], thread_info->active_hooks );
 799         return FALSE;
 800     }
 801
 802     SERVER_START_REQ( start_hook_chain )
 803     {
 804         req->id = id;
 805         req->event = event;
 806         req->window = wine_server_user_handle( hwnd );
 807         req->object_id = object_id;
 808         req->child_id = child_id;
 809         wine_server_set_reply( req, info->module, sizeof(info->module)-sizeof(WCHAR) );
 810         ret = !wine_server_call( req );
 811         if (ret)
 812         {
 813             info->module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 814             info->handle    = wine_server_ptr_handle( reply->handle );
 815             info->proc      = wine_server_get_ptr( reply->proc );
 816             info->tid       = reply->tid;
 817             thread_info->active_hooks = reply->active_hooks;
 818         }
 819     }
 820     SERVER_END_REQ;
 821     return ret && (info->tid || info->proc);
 822 }
 823
 824 static inline BOOL find_next_hook(DWORD event, HWND hwnd, LONG object_id,
 825                                   LONG child_id, struct hook_info *info)
 826 {
 827     BOOL ret;
 828
 829     SERVER_START_REQ( get_hook_info )
 830     {
 831         req->handle = wine_server_user_handle( info->handle );
 832         req->get_next = 1;
 833         req->event = event;
 834         req->window = wine_server_user_handle( hwnd );
 835         req->object_id = object_id;
 836         req->child_id = child_id;
 837         wine_server_set_reply( req, info->module, sizeof(info->module)-sizeof(WCHAR) );
 838         ret = !wine_server_call( req );
 839         if (ret)
 840         {
 841             info->module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 842             info->handle    = wine_server_ptr_handle( reply->handle );
 843             info->proc      = wine_server_get_ptr( reply->proc );
 844             info->tid       = reply->tid;
 845         }
 846     }
 847     SERVER_END_REQ;
 848     return ret;
 849 }
 850
 851 static inline void find_hook_close(DWORD id)
 852 {
 853     SERVER_START_REQ( finish_hook_chain )
 854     {
 855         req->id = id;
 856         wine_server_call( req );
 857     }
 858     SERVER_END_REQ;
 859 }
 860
 861 /***********************************************************************
 862  *           NotifyWinEvent                             [USER32.@]
 863  *
 864  * Inform the OS that an event has occurred.
 865  *
 866  * PARAMS
 867  *  event     [I] Id of the event
 868  *  hwnd      [I] Window holding the object that created the event
 869  *  object_id [I] Type of object that created the event
 870  *  child_id  [I] Child object of nId, or CHILDID_SELF.
 871  *
 872  * RETURNS
 873  *  Nothing.
 874  */
 875 void WINAPI NotifyWinEvent(DWORD event, HWND hwnd, LONG object_id, LONG child_id)
 876 {
 877     struct hook_info info;
 878
 879     TRACE("%04x,%p,%d,%d\n", event, hwnd, object_id, child_id);
 880
 881     if (!hwnd)
 882     {
 883         SetLastError(ERROR_INVALID_WINDOW_HANDLE);
 884         return;
 885     }
 886
 887     USER_CheckNotLock();
 888
 889 #if 0
 890     if (event & 0x80000000)
 891     {
 892         /* FIXME: on 64-bit platforms we need to invent some other way for
 893          * passing parameters, nId and nChildId can't hold full [W|L]PARAM.
 894          * struct call_hook *hook = (LRESULT *)hWnd;
 895          * wparam = hook->wparam;
 896          * lparam = hook->lparam;
 897          */
 898         LRESULT *ret = (LRESULT *)hwnd;
 899         INT id, code, unicode;
 900
 901         id = (dwEvent & 0x7fff0000) >> 16;
 902         code = event & 0x7fff;
 903         unicode = event & 0x8000;
 904         *ret = HOOK_CallHooks(id, code, object_id, child_id, unicode);
 905         return;
 906     }
 907 #endif
 908
 909     if (!find_first_hook(WH_WINEVENT, event, hwnd, object_id, child_id, &info)) return;
 910
 911     do
 912     {
 913         WINEVENTPROC proc = info.proc;
 914         if (proc)
 915         {
 916             HMODULE free_module = 0;
 917             TRACE( "calling WH_WINEVENT hook %p event %x hwnd %p %x %x module %s\n",
 918                    proc, event, hwnd, object_id, child_id, debugstr_w(info.module) );
 919
 920             if (!info.module[0] || (proc = get_hook_proc( proc, info.module, &free_module )) != NULL)
 921             {
 922                 TRACE_(relay)( "\1Call winevent hook proc %p (hhook=%p,event=%x,hwnd=%p,object_id=%x,child_id=%x,tid=%04x,time=%x)\n",
 923                                proc, info.handle, event, hwnd, object_id,
 924                                child_id, GetCurrentThreadId(), GetCurrentTime());
 925
 926                 proc( info.handle, event, hwnd, object_id, child_id,
 927                       GetCurrentThreadId(), GetCurrentTime());
 928
 929                 TRACE_(relay)( "\1Ret  winevent hook proc %p (hhook=%p,event=%x,hwnd=%p,object_id=%x,child_id=%x,tid=%04x,time=%x)\n",
 930                              proc, info.handle, event, hwnd, object_id,
 931                              child_id, GetCurrentThreadId(), GetCurrentTime());
 932
 933                 if (free_module) FreeLibrary(free_module);
 934             }
 935         }
 936         else
 937             break;
 938     }
 939     while (find_next_hook(event, hwnd, object_id, child_id, &info));
 940
 941     find_hook_close(WH_WINEVENT);
 942 }
 943
 944
 945 /***********************************************************************
 946  *           IsWinEventHookInstalled                       [USER32.@]
 947  *
 948  * Determine if an event hook is installed for an event.
 949  *
 950  * PARAMS
 951  *  dwEvent  [I] Id of the event
 952  *
 953  * RETURNS
 954  *  TRUE,  If there are any hooks installed for the event.
 955  *  FALSE, Otherwise.
 956  *
 957  * BUGS
 958  *  Not implemented.
 959  */
 960 BOOL WINAPI IsWinEventHookInstalled(DWORD dwEvent)
 961 {
 962     /* FIXME: Needed by Office 2007 installer */
 963     WARN("(%d)-stub!\n", dwEvent);
 964     return TRUE;
 965 }