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 "winuser.h"
  74 #include "winerror.h"
  75 #include "win.h"
  76 #include "user_private.h"
  77 #include "wine/server.h"
  78 #include "wine/unicode.h"
  79 #include "wine/debug.h"
  80 #include "winternl.h"
  81
  82 WINE_DEFAULT_DEBUG_CHANNEL(hook);
  83 WINE_DECLARE_DEBUG_CHANNEL(relay);
  84
  85 struct hook_info
  86 {
  87     INT id;
  88     FARPROC proc;
  89     void *handle;
  90     DWORD pid, tid;
  91     BOOL prev_unicode, next_unicode;
  92     WCHAR module[MAX_PATH];
  93 };
  94
  95 #define WH_WINEVENT (WH_MAXHOOK+1)
  96
  97 static const char * const hook_names[WH_WINEVENT - WH_MINHOOK + 1] =
  98 {
  99     "WH_MSGFILTER",
 100     "WH_JOURNALRECORD",
 101     "WH_JOURNALPLAYBACK",
 102     "WH_KEYBOARD",
 103     "WH_GETMESSAGE",
 104     "WH_CALLWNDPROC",
 105     "WH_CBT",
 106     "WH_SYSMSGFILTER",
 107     "WH_MOUSE",
 108     "WH_HARDWARE",
 109     "WH_DEBUG",
 110     "WH_SHELL",
 111     "WH_FOREGROUNDIDLE",
 112     "WH_CALLWNDPROCRET",
 113     "WH_KEYBOARD_LL",
 114     "WH_MOUSE_LL",
 115     "WH_WINEVENT"
 116 };
 117
 118
 119 /***********************************************************************
 120  *              get_ll_hook_timeout
 121  *
 122  */
 123 static UINT get_ll_hook_timeout(void)
 124 {
 125     /* FIXME: should retrieve LowLevelHooksTimeout in HKEY_CURRENT_USER\Control Panel\Desktop */
 126     return 2000;
 127 }
 128
 129
 130 /***********************************************************************
 131  *              set_windows_hook
 132  *
 133  * Implementation of SetWindowsHookExA and SetWindowsHookExW.
 134  */
 135 static HHOOK set_windows_hook( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid, BOOL unicode )
 136 {
 137     HHOOK handle = 0;
 138     WCHAR module[MAX_PATH];
 139     DWORD len;
 140
 141     if (!proc)
 142     {
 143         SetLastError( ERROR_INVALID_FILTER_PROC );
 144         return 0;
 145     }
 146
 147     /* FIXME: what if the tid belongs to another process? */
 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         inst = 0;
 161     }
 162     else  /* system-global hook */
 163     {
 164         if (id == WH_KEYBOARD_LL || id == WH_MOUSE_LL) inst = 0;
 165         else if (!inst || !(len = GetModuleFileNameW( inst, module, MAX_PATH )) || len >= MAX_PATH)
 166         {
 167             SetLastError( ERROR_HOOK_NEEDS_HMOD );
 168             return 0;
 169         }
 170     }
 171
 172     SERVER_START_REQ( set_hook )
 173     {
 174         req->id        = id;
 175         req->pid       = 0;
 176         req->tid       = tid;
 177         req->event_min = EVENT_MIN;
 178         req->event_max = EVENT_MAX;
 179         req->flags     = WINEVENT_INCONTEXT;
 180         req->unicode   = unicode;
 181         if (inst) /* make proc relative to the module base */
 182         {
 183             req->proc = (void *)((char *)proc - (char *)inst);
 184             wine_server_add_data( req, module, strlenW(module) * sizeof(WCHAR) );
 185         }
 186         else req->proc = proc;
 187
 188         if (!wine_server_call_err( req ))
 189         {
 190             handle = reply->handle;
 191             get_user_thread_info()->active_hooks = reply->active_hooks;
 192         }
 193     }
 194     SERVER_END_REQ;
 195
 196     TRACE( "%s %p %x -> %p\n", hook_names[id-WH_MINHOOK], proc, tid, handle );
 197     return handle;
 198 }
 199
 200
 201 /***********************************************************************
 202  *              call_hook_AtoW
 203  */
 204 static LRESULT call_hook_AtoW( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 205 {
 206     LRESULT ret;
 207     UNICODE_STRING usBuffer;
 208     if (id != WH_CBT || code != HCBT_CREATEWND) ret = proc( code, wparam, lparam );
 209     else
 210     {
 211         CBT_CREATEWNDA *cbtcwA = (CBT_CREATEWNDA *)lparam;
 212         CBT_CREATEWNDW cbtcwW;
 213         CREATESTRUCTW csW;
 214         LPWSTR nameW = NULL;
 215         LPWSTR classW = NULL;
 216
 217         cbtcwW.lpcs = &csW;
 218         cbtcwW.hwndInsertAfter = cbtcwA->hwndInsertAfter;
 219         csW = *(CREATESTRUCTW *)cbtcwA->lpcs;
 220
 221         if (HIWORD(cbtcwA->lpcs->lpszName))
 222         {
 223             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszName);
 224             csW.lpszName = nameW = usBuffer.Buffer;
 225         }
 226         if (HIWORD(cbtcwA->lpcs->lpszClass))
 227         {
 228             RtlCreateUnicodeStringFromAsciiz(&usBuffer,cbtcwA->lpcs->lpszClass);
 229             csW.lpszClass = classW = usBuffer.Buffer;
 230         }
 231         ret = proc( code, wparam, (LPARAM)&cbtcwW );
 232         cbtcwA->hwndInsertAfter = cbtcwW.hwndInsertAfter;
 233         HeapFree( GetProcessHeap(), 0, nameW );
 234         HeapFree( GetProcessHeap(), 0, classW );
 235     }
 236     return ret;
 237 }
 238
 239
 240 /***********************************************************************
 241  *              call_hook_WtoA
 242  */
 243 static LRESULT call_hook_WtoA( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam )
 244 {
 245     LRESULT ret;
 246
 247     if (id != WH_CBT || code != HCBT_CREATEWND) ret = proc( code, wparam, lparam );
 248     else
 249     {
 250         CBT_CREATEWNDW *cbtcwW = (CBT_CREATEWNDW *)lparam;
 251         CBT_CREATEWNDA cbtcwA;
 252         CREATESTRUCTA csA;
 253         int len;
 254         LPSTR nameA = NULL;
 255         LPSTR classA = NULL;
 256
 257         cbtcwA.lpcs = &csA;
 258         cbtcwA.hwndInsertAfter = cbtcwW->hwndInsertAfter;
 259         csA = *(CREATESTRUCTA *)cbtcwW->lpcs;
 260
 261         if (HIWORD(cbtcwW->lpcs->lpszName)) {
 262             len = WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszName, -1, NULL, 0, NULL, NULL );
 263             nameA = HeapAlloc( GetProcessHeap(), 0, len*sizeof(CHAR) );
 264             WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszName, -1, nameA, len, NULL, NULL );
 265             csA.lpszName = nameA;
 266         }
 267
 268         if (HIWORD(cbtcwW->lpcs->lpszClass)) {
 269             len = WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszClass, -1, NULL, 0, NULL, NULL );
 270             classA = HeapAlloc( GetProcessHeap(), 0, len*sizeof(CHAR) );
 271             WideCharToMultiByte( CP_ACP, 0, cbtcwW->lpcs->lpszClass, -1, classA, len, NULL, NULL );
 272             csA.lpszClass = classA;
 273         }
 274
 275         ret = proc( code, wparam, (LPARAM)&cbtcwA );
 276         cbtcwW->hwndInsertAfter = cbtcwA.hwndInsertAfter;
 277         HeapFree( GetProcessHeap(), 0, nameA );
 278         HeapFree( GetProcessHeap(), 0, classA );
 279     }
 280     return ret;
 281 }
 282
 283
 284 /***********************************************************************
 285  *              call_hook_proc
 286  */
 287 static LRESULT call_hook_proc( HOOKPROC proc, INT id, INT code, WPARAM wparam, LPARAM lparam,
 288                                BOOL prev_unicode, BOOL next_unicode )
 289 {
 290     LRESULT ret;
 291
 292     if (TRACE_ON(relay))
 293         DPRINTF( "%04x:Call hook proc %p (id=%s,code=%x,wp=%08lx,lp=%08lx)\n",
 294                  GetCurrentThreadId(), proc, hook_names[id-WH_MINHOOK], code, wparam, lparam );
 295
 296     if (!prev_unicode == !next_unicode) ret = proc( code, wparam, lparam );
 297     else if (prev_unicode) ret = call_hook_WtoA( proc, id, code, wparam, lparam );
 298     else ret = call_hook_AtoW( proc, id, code, wparam, lparam );
 299
 300     if (TRACE_ON(relay))
 301         DPRINTF( "%04x:Ret  hook proc %p (id=%s,code=%x,wp=%08lx,lp=%08lx) retval=%08lx\n",
 302                  GetCurrentThreadId(), proc, hook_names[id-WH_MINHOOK], code, wparam, lparam, ret );
 303
 304     return ret;
 305 }
 306
 307
 308 /***********************************************************************
 309  *              get_hook_proc
 310  *
 311  * Retrieve the hook procedure real value for a module-relative proc
 312  */
 313 static void *get_hook_proc( void *proc, const WCHAR *module )
 314 {
 315     HMODULE mod;
 316
 317     if (!(mod = GetModuleHandleW(module)))
 318     {
 319         TRACE( "loading %s\n", debugstr_w(module) );
 320         /* FIXME: the library will never be freed */
 321         if (!(mod = LoadLibraryW(module))) return NULL;
 322     }
 323     return (char *)mod + (ULONG_PTR)proc;
 324 }
 325
 326 /***********************************************************************
 327  *              call_hook
 328  *
 329  * Call hook either in current thread or send message to the destination
 330  * thread.
 331  */
 332 static LRESULT call_hook( struct hook_info *info, INT code, WPARAM wparam, LPARAM lparam )
 333 {
 334     DWORD_PTR ret = 0;
 335
 336     if (info->tid)
 337     {
 338         struct hook_extra_info h_extra;
 339         h_extra.handle = info->handle;
 340         h_extra.lparam = lparam;
 341
 342         TRACE( "calling hook in thread %04x %s code %x wp %lx lp %lx\n",
 343                info->tid, hook_names[info->id-WH_MINHOOK], code, wparam, lparam );
 344
 345         switch(info->id)
 346         {
 347         case WH_KEYBOARD_LL:
 348             MSG_SendInternalMessageTimeout( info->pid, info->tid, WM_WINE_KEYBOARD_LL_HOOK,
 349                                             wparam, (LPARAM)&h_extra, SMTO_ABORTIFHUNG,
 350                                             get_ll_hook_timeout(), &ret );
 351             break;
 352         case WH_MOUSE_LL:
 353             MSG_SendInternalMessageTimeout( info->pid, info->tid, WM_WINE_MOUSE_LL_HOOK,
 354                                             wparam, (LPARAM)&h_extra, SMTO_ABORTIFHUNG,
 355                                             get_ll_hook_timeout(), &ret );
 356             break;
 357         default:
 358             ERR("Unknown hook id %d\n", info->id);
 359             assert(0);
 360             break;
 361         }
 362     }
 363     else if (info->proc)
 364     {
 365         TRACE( "calling hook %p %s code %x wp %lx lp %lx module %s\n",
 366                info->proc, hook_names[info->id-WH_MINHOOK], code, wparam,
 367                lparam, debugstr_w(info->module) );
 368
 369         if (!info->module[0] ||
 370             (info->proc = get_hook_proc( info->proc, info->module )) != NULL)
 371         {
 372             struct user_thread_info *thread_info = get_user_thread_info();
 373             HHOOK prev = thread_info->hook;
 374             BOOL prev_unicode = thread_info->hook_unicode;
 375
 376             thread_info->hook = info->handle;
 377             thread_info->hook_unicode = info->next_unicode;
 378             ret = call_hook_proc( (HOOKPROC)info->proc, info->id, code, wparam, lparam,
 379                                   info->prev_unicode, info->next_unicode );
 380             thread_info->hook = prev;
 381             thread_info->hook_unicode = prev_unicode;
 382         }
 383     }
 384     return ret;
 385 }
 386
 387 /***********************************************************************
 388  *              HOOK_CallHooks
 389  */
 390 LRESULT HOOK_CallHooks( INT id, INT code, WPARAM wparam, LPARAM lparam, BOOL unicode )
 391 {
 392     struct user_thread_info *thread_info = get_user_thread_info();
 393     struct hook_info info;
 394     DWORD_PTR ret = 0;
 395
 396     USER_CheckNotLock();
 397
 398     if (!HOOK_IsHooked( id ))
 399     {
 400         TRACE( "skipping hook %s mask %x\n", hook_names[id-WH_MINHOOK], thread_info->active_hooks );
 401         return 0;
 402     }
 403
 404     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 405     info.prev_unicode = unicode;
 406     info.id = id;
 407
 408     SERVER_START_REQ( start_hook_chain )
 409     {
 410         req->id = info.id;
 411         req->event = EVENT_MIN;
 412         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 413         if (!wine_server_call( req ))
 414         {
 415             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 416             info.handle       = reply->handle;
 417             info.pid          = reply->pid;
 418             info.tid          = reply->tid;
 419             info.proc         = reply->proc;
 420             info.next_unicode = reply->unicode;
 421             thread_info->active_hooks = reply->active_hooks;
 422         }
 423     }
 424     SERVER_END_REQ;
 425
 426     if (!info.tid && !info.proc) return 0;
 427     ret = call_hook( &info, code, wparam, lparam );
 428
 429     SERVER_START_REQ( finish_hook_chain )
 430     {
 431         req->id = id;
 432         wine_server_call( req );
 433     }
 434     SERVER_END_REQ;
 435     return ret;
 436 }
 437
 438
 439 /***********************************************************************
 440  *           HOOK_IsHooked
 441  */
 442 BOOL HOOK_IsHooked( INT id )
 443 {
 444     struct user_thread_info *thread_info = get_user_thread_info();
 445
 446     if (!thread_info->active_hooks) return TRUE;
 447     return (thread_info->active_hooks & (1 << (id - WH_MINHOOK))) != 0;
 448 }
 449
 450
 451 /***********************************************************************
 452  *              SetWindowsHookA (USER32.@)
 453  */
 454 HHOOK WINAPI SetWindowsHookA( INT id, HOOKPROC proc )
 455 {
 456     return SetWindowsHookExA( id, proc, 0, GetCurrentThreadId() );
 457 }
 458
 459
 460 /***********************************************************************
 461  *              SetWindowsHookW (USER32.@)
 462  */
 463 HHOOK WINAPI SetWindowsHookW( INT id, HOOKPROC proc )
 464 {
 465     return SetWindowsHookExW( id, proc, 0, GetCurrentThreadId() );
 466 }
 467
 468
 469 /***********************************************************************
 470  *              SetWindowsHookExA (USER32.@)
 471  */
 472 HHOOK WINAPI SetWindowsHookExA( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 473 {
 474     return set_windows_hook( id, proc, inst, tid, FALSE );
 475 }
 476
 477 /***********************************************************************
 478  *              SetWindowsHookExW (USER32.@)
 479  */
 480 HHOOK WINAPI SetWindowsHookExW( INT id, HOOKPROC proc, HINSTANCE inst, DWORD tid )
 481 {
 482     return set_windows_hook( id, proc, inst, tid, TRUE );
 483 }
 484
 485
 486 /***********************************************************************
 487  *              UnhookWindowsHook (USER32.@)
 488  */
 489 BOOL WINAPI UnhookWindowsHook( INT id, HOOKPROC proc )
 490 {
 491     BOOL ret;
 492
 493     TRACE( "%s %p\n", hook_names[id-WH_MINHOOK], proc );
 494
 495     SERVER_START_REQ( remove_hook )
 496     {
 497         req->handle = 0;
 498         req->id   = id;
 499         req->proc = proc;
 500         ret = !wine_server_call_err( req );
 501         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 502     }
 503     SERVER_END_REQ;
 504     if (!ret && GetLastError() == ERROR_INVALID_HANDLE) SetLastError( ERROR_INVALID_HOOK_HANDLE );
 505     return ret;
 506 }
 507
 508
 509
 510 /***********************************************************************
 511  *              UnhookWindowsHookEx (USER32.@)
 512  */
 513 BOOL WINAPI UnhookWindowsHookEx( HHOOK hhook )
 514 {
 515     BOOL ret;
 516
 517     TRACE( "%p\n", hhook );
 518
 519     SERVER_START_REQ( remove_hook )
 520     {
 521         req->handle = hhook;
 522         req->id     = 0;
 523         ret = !wine_server_call_err( req );
 524         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 525     }
 526     SERVER_END_REQ;
 527     if (!ret && GetLastError() == ERROR_INVALID_HANDLE) SetLastError( ERROR_INVALID_HOOK_HANDLE );
 528     return ret;
 529 }
 530
 531
 532 /***********************************************************************
 533  *              CallNextHookEx (USER32.@)
 534  */
 535 LRESULT WINAPI CallNextHookEx( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam )
 536 {
 537     struct user_thread_info *thread_info = get_user_thread_info();
 538     struct hook_info info;
 539
 540     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 541
 542     SERVER_START_REQ( get_hook_info )
 543     {
 544         req->handle = thread_info->hook;
 545         req->get_next = 1;
 546         req->event = EVENT_MIN;
 547         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 548         if (!wine_server_call_err( req ))
 549         {
 550             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 551             info.handle       = reply->handle;
 552             info.id           = reply->id;
 553             info.pid          = reply->pid;
 554             info.tid          = reply->tid;
 555             info.proc         = reply->proc;
 556             info.next_unicode = reply->unicode;
 557         }
 558     }
 559     SERVER_END_REQ;
 560
 561     info.prev_unicode = thread_info->hook_unicode;
 562     return call_hook( &info, code, wparam, lparam );
 563 }
 564
 565
 566 LRESULT call_current_hook( HHOOK hhook, INT code, WPARAM wparam, LPARAM lparam )
 567 {
 568     struct hook_info info;
 569
 570     ZeroMemory( &info, sizeof(info) - sizeof(info.module) );
 571
 572     SERVER_START_REQ( get_hook_info )
 573     {
 574         req->handle = hhook;
 575         req->get_next = 0;
 576         req->event = EVENT_MIN;
 577         wine_server_set_reply( req, info.module, sizeof(info.module)-sizeof(WCHAR) );
 578         if (!wine_server_call_err( req ))
 579         {
 580             info.module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 581             info.handle       = reply->handle;
 582             info.id           = reply->id;
 583             info.pid          = reply->pid;
 584             info.tid          = reply->tid;
 585             info.proc         = reply->proc;
 586             info.next_unicode = reply->unicode;
 587         }
 588     }
 589     SERVER_END_REQ;
 590
 591     info.prev_unicode = TRUE;  /* assume Unicode for this function */
 592     return call_hook( &info, code, wparam, lparam );
 593 }
 594
 595 /***********************************************************************
 596  *              CallMsgFilterA (USER32.@)
 597  */
 598 BOOL WINAPI CallMsgFilterA( LPMSG msg, INT code )
 599 {
 600     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, FALSE )) return TRUE;
 601     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, FALSE );
 602 }
 603
 604
 605 /***********************************************************************
 606  *              CallMsgFilterW (USER32.@)
 607  */
 608 BOOL WINAPI CallMsgFilterW( LPMSG msg, INT code )
 609 {
 610     if (HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)msg, TRUE )) return TRUE;
 611     return HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)msg, TRUE );
 612 }
 613
 614
 615 /***********************************************************************
 616  *           SetWinEventHook                            [USER32.@]
 617  *
 618  * Set up an event hook for a set of events.
 619  *
 620  * PARAMS
 621  *  event_min [I] Lowest event handled by pfnProc
 622  *  event_max [I] Highest event handled by pfnProc
 623  *  inst      [I] DLL containing pfnProc
 624  *  proc      [I] Callback event hook function
 625  *  pid       [I] Process to get events from, or 0 for all processes
 626  *  tid       [I] Thread to get events from, or 0 for all threads
 627  *  flags     [I] Flags indicating the status of pfnProc
 628  *
 629  * RETURNS
 630  *  Success: A handle representing the hook.
 631  *  Failure: A NULL handle.
 632  */
 633 HWINEVENTHOOK WINAPI SetWinEventHook(DWORD event_min, DWORD event_max,
 634                                      HMODULE inst, WINEVENTPROC proc,
 635                                      DWORD pid, DWORD tid, DWORD flags)
 636 {
 637     HWINEVENTHOOK handle = 0;
 638     WCHAR module[MAX_PATH];
 639     DWORD len;
 640
 641     TRACE("%d,%d,%p,%p,%08x,%04x,%08x\n", event_min, event_max, inst,
 642           proc, pid, tid, flags);
 643
 644     if (inst)
 645     {
 646         if (!(len = GetModuleFileNameW(inst, module, MAX_PATH)) || len >= MAX_PATH)
 647             inst = 0;
 648     }
 649
 650     if ((flags & WINEVENT_INCONTEXT) && !inst)
 651     {
 652         SetLastError(ERROR_HOOK_NEEDS_HMOD);
 653         return 0;
 654     }
 655
 656     if (event_min > event_max)
 657     {
 658         SetLastError(ERROR_INVALID_HOOK_FILTER);
 659         return 0;
 660     }
 661
 662     /* FIXME: what if the tid or pid belongs to another process? */
 663     if (tid)  /* thread-local hook */
 664         inst = 0;
 665
 666     SERVER_START_REQ( set_hook )
 667     {
 668         req->id        = WH_WINEVENT;
 669         req->pid       = pid;
 670         req->tid       = tid;
 671         req->event_min = event_min;
 672         req->event_max = event_max;
 673         req->flags     = flags;
 674         req->unicode   = 1;
 675         if (inst) /* make proc relative to the module base */
 676         {
 677             req->proc = (void *)((char *)proc - (char *)inst);
 678             wine_server_add_data( req, module, strlenW(module) * sizeof(WCHAR) );
 679         }
 680         else req->proc = proc;
 681
 682         if (!wine_server_call_err( req ))
 683         {
 684             handle = reply->handle;
 685             get_user_thread_info()->active_hooks = reply->active_hooks;
 686         }
 687     }
 688     SERVER_END_REQ;
 689
 690     TRACE("-> %p\n", handle);
 691     return handle;
 692 }
 693
 694
 695 /***********************************************************************
 696  *           UnhookWinEvent                             [USER32.@]
 697  *
 698  * Remove an event hook for a set of events.
 699  *
 700  * PARAMS
 701  *  hEventHook [I] Event hook to remove
 702  *
 703  * RETURNS
 704  *  Success: TRUE. The event hook has been removed.
 705  *  Failure: FALSE, if hEventHook is invalid.
 706  */
 707 BOOL WINAPI UnhookWinEvent(HWINEVENTHOOK hEventHook)
 708 {
 709     BOOL ret;
 710
 711     TRACE( "%p\n", hEventHook );
 712
 713     SERVER_START_REQ( remove_hook )
 714     {
 715         req->handle = hEventHook;
 716         req->id     = WH_WINEVENT;
 717         ret = !wine_server_call_err( req );
 718         if (ret) get_user_thread_info()->active_hooks = reply->active_hooks;
 719     }
 720     SERVER_END_REQ;
 721     return ret;
 722 }
 723
 724 static inline BOOL find_first_hook(DWORD id, DWORD event, HWND hwnd, LONG object_id,
 725                                    LONG child_id, struct hook_info *info)
 726 {
 727     struct user_thread_info *thread_info = get_user_thread_info();
 728     BOOL ret;
 729
 730     if (!HOOK_IsHooked( id ))
 731     {
 732         TRACE( "skipping hook %s mask %x\n", hook_names[id-WH_MINHOOK], thread_info->active_hooks );
 733         return FALSE;
 734     }
 735
 736     SERVER_START_REQ( start_hook_chain )
 737     {
 738         req->id = id;
 739         req->event = event;
 740         req->window = hwnd;
 741         req->object_id = object_id;
 742         req->child_id = child_id;
 743         wine_server_set_reply( req, info->module, sizeof(info->module)-sizeof(WCHAR) );
 744         ret = !wine_server_call( req );
 745         if (ret)
 746         {
 747             info->module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 748             info->handle    = reply->handle;
 749             info->proc      = reply->proc;
 750             info->tid       = reply->tid;
 751             thread_info->active_hooks = reply->active_hooks;
 752         }
 753     }
 754     SERVER_END_REQ;
 755     return ret && (info->tid || info->proc);
 756 }
 757
 758 static inline BOOL find_next_hook(DWORD event, HWND hwnd, LONG object_id,
 759                                   LONG child_id, struct hook_info *info)
 760 {
 761     BOOL ret;
 762
 763     SERVER_START_REQ( get_hook_info )
 764     {
 765         req->handle = info->handle;
 766         req->get_next = 1;
 767         req->event = event;
 768         req->window = hwnd;
 769         req->object_id = object_id;
 770         req->child_id = child_id;
 771         wine_server_set_reply( req, info->module, sizeof(info->module)-sizeof(WCHAR) );
 772         ret = !wine_server_call( req );
 773         if (ret)
 774         {
 775             info->module[wine_server_reply_size(req) / sizeof(WCHAR)] = 0;
 776             info->handle    = reply->handle;
 777             info->proc      = reply->proc;
 778             info->tid       = reply->tid;
 779         }
 780     }
 781     SERVER_END_REQ;
 782     return ret;
 783 }
 784
 785 static inline void find_hook_close(DWORD id)
 786 {
 787     SERVER_START_REQ( finish_hook_chain )
 788     {
 789         req->id = id;
 790         wine_server_call( req );
 791     }
 792     SERVER_END_REQ;
 793 }
 794
 795 /***********************************************************************
 796  *           NotifyWinEvent                             [USER32.@]
 797  *
 798  * Inform the OS that an event has occurred.
 799  *
 800  * PARAMS
 801  *  event     [I] Id of the event
 802  *  hwnd      [I] Window holding the object that created the event
 803  *  object_id [I] Type of object that created the event
 804  *  child_id  [I] Child object of nId, or CHILDID_SELF.
 805  *
 806  * RETURNS
 807  *  Nothing.
 808  */
 809 void WINAPI NotifyWinEvent(DWORD event, HWND hwnd, LONG object_id, LONG child_id)
 810 {
 811     struct hook_info info;
 812
 813     TRACE("%04x,%p,%d,%d\n", event, hwnd, object_id, child_id);
 814
 815     if (!hwnd)
 816     {
 817         SetLastError(ERROR_INVALID_WINDOW_HANDLE);
 818         return;
 819     }
 820
 821     USER_CheckNotLock();
 822
 823 #if 0
 824     if (event & 0x80000000)
 825     {
 826         /* FIXME: on 64-bit platforms we need to invent some other way for
 827          * passing parameters, nId and nChildId can't hold full [W|L]PARAM.
 828          * struct call_hook *hook = (LRESULT *)hWnd;
 829          * wparam = hook->wparam;
 830          * lparam = hook->lparam;
 831          */
 832         LRESULT *ret = (LRESULT *)hwnd;
 833         INT id, code, unicode;
 834
 835         id = (dwEvent & 0x7fff0000) >> 16;
 836         code = event & 0x7fff;
 837         unicode = event & 0x8000;
 838         *ret = HOOK_CallHooks(id, code, object_id, child_id, unicode);
 839         return;
 840     }
 841 #endif
 842
 843     if (!find_first_hook(WH_WINEVENT, event, hwnd, object_id, child_id, &info)) return;
 844
 845     do
 846     {
 847         if (info.proc)
 848         {
 849             TRACE( "calling WH_WINEVENT hook %p event %x hwnd %p %x %x module %s\n",
 850                    info.proc, event, hwnd, object_id, child_id, debugstr_w(info.module) );
 851
 852             if (!info.module[0] || (info.proc = get_hook_proc( info.proc, info.module )) != NULL)
 853             {
 854                 if (TRACE_ON(relay))
 855                     DPRINTF( "%04x:Call winevent hook proc %p (hhook=%p,event=%x,hwnd=%p,object_id=%x,child_id=%x,tid=%04x,time=%x)\n",
 856                              GetCurrentThreadId(), info.proc, info.handle, event, hwnd, object_id,
 857                              child_id, GetCurrentThreadId(), GetCurrentTime());
 858
 859                 info.proc(info.handle, event, hwnd, object_id, child_id,
 860                           GetCurrentThreadId(), GetCurrentTime());
 861
 862                 if (TRACE_ON(relay))
 863                     DPRINTF( "%04x:Ret  winevent hook proc %p (hhook=%p,event=%x,hwnd=%p,object_id=%x,child_id=%x,tid=%04x,time=%x)\n",
 864                              GetCurrentThreadId(), info.proc, info.handle, event, hwnd, object_id,
 865                              child_id, GetCurrentThreadId(), GetCurrentTime());
 866             }
 867         }
 868         else
 869             break;
 870     }
 871     while (find_next_hook(event, hwnd, object_id, child_id, &info));
 872
 873     find_hook_close(WH_WINEVENT);
 874 }
 875
 876
 877 /***********************************************************************
 878  *           IsWinEventHookInstalled                       [USER32.@]
 879  *
 880  * Determine if an event hook is installed for an event.
 881  *
 882  * PARAMS
 883  *  dwEvent  [I] Id of the event
 884  *
 885  * RETURNS
 886  *  TRUE,  If there are any hooks installed for the event.
 887  *  FALSE, Otherwise.
 888  *
 889  * BUGS
 890  *  Not implemented.
 891  */
 892 BOOL WINAPI IsWinEventHookInstalled(DWORD dwEvent)
 893 {
 894     FIXME("(%d)-stub!\n", dwEvent);
 895     return TRUE;
 896 }