2 * Server-side window hooks support
4 * Copyright (C) 2002 Alexandre Julliard
5 * Copyright (C) 2005 Dmitry Timoshkov
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.
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.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "wine/port.h"
30 #define WIN32_NO_STATUS
45 struct list chain; /* hook chain entry */
46 user_handle_t handle; /* user handle for this hook */
47 struct process *process; /* process the hook is set to */
48 struct thread *thread; /* thread the hook is set to */
49 struct thread *owner; /* owner of the out of context hook */
50 struct hook_table *table; /* hook table that contains this hook */
51 int index; /* hook table index */
55 void *proc; /* hook function */
56 int unicode; /* is it a unicode hook? */
57 WCHAR *module; /* module name for global hooks */
61 #define WH_WINEVENT (WH_MAXHOOK+1)
63 #define NB_HOOKS (WH_WINEVENT-WH_MINHOOK+1)
64 #define HOOK_ENTRY(p) LIST_ENTRY( (p), struct hook, chain )
68 struct object obj; /* object header */
69 struct list hooks[NB_HOOKS]; /* array of hook chains */
70 int counts[NB_HOOKS]; /* use counts for each hook chain */
73 static void hook_table_dump( struct object *obj, int verbose );
74 static void hook_table_destroy( struct object *obj );
76 static const struct object_ops hook_table_ops =
78 sizeof(struct hook_table), /* size */
79 hook_table_dump, /* dump */
80 no_add_queue, /* add_queue */
81 NULL, /* remove_queue */
84 no_signal, /* signal */
85 no_get_fd, /* get_fd */
86 no_lookup_name, /* lookup_name */
87 no_close_handle, /* close_handle */
88 hook_table_destroy /* destroy */
92 /* create a new hook table */
93 static struct hook_table *alloc_hook_table(void)
95 struct hook_table *table;
98 if ((table = alloc_object( &hook_table_ops )))
100 for (i = 0; i < NB_HOOKS; i++)
102 list_init( &table->hooks[i] );
103 table->counts[i] = 0;
109 static struct hook_table *get_global_hooks( struct thread *thread )
111 struct hook_table *table;
112 struct desktop *desktop = get_thread_desktop( thread, 0 );
114 if (!desktop) return NULL;
115 table = desktop->global_hooks;
116 release_object( desktop );
120 /* create a new hook and add it to the specified table */
121 static struct hook *add_hook( struct desktop *desktop, struct thread *thread, int index, int global )
124 struct hook_table *table = global ? desktop->global_hooks : get_queue_hooks(thread);
128 if (!(table = alloc_hook_table())) return NULL;
129 if (global) desktop->global_hooks = table;
130 else set_queue_hooks( thread, table );
132 if (!(hook = mem_alloc( sizeof(*hook) ))) return NULL;
134 if (!(hook->handle = alloc_user_handle( hook, USER_HOOK )))
139 hook->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
142 list_add_head( &table->hooks[index], &hook->chain );
143 if (thread) thread->desktop_users++;
147 /* free a hook, removing it from its chain */
148 static void free_hook( struct hook *hook )
150 free_user_handle( hook->handle );
151 if (hook->module) free( hook->module );
154 assert( hook->thread->desktop_users > 0 );
155 hook->thread->desktop_users--;
156 release_object( hook->thread );
158 if (hook->process) release_object( hook->process );
159 release_object( hook->owner );
160 list_remove( &hook->chain );
164 /* find a hook from its index and proc */
165 static struct hook *find_hook( struct thread *thread, int index, void *proc )
168 struct hook_table *table = get_queue_hooks( thread );
172 LIST_FOR_EACH( p, &table->hooks[index] )
174 struct hook *hook = HOOK_ENTRY( p );
175 if (hook->proc == proc) return hook;
181 /* get the first hook in the chain */
182 inline static struct hook *get_first_hook( struct hook_table *table, int index )
184 struct list *elem = list_head( &table->hooks[index] );
185 return elem ? HOOK_ENTRY( elem ) : NULL;
188 /* check if a given hook should run in the current thread */
189 inline static int run_hook_in_current_thread( struct hook *hook )
191 if ((!hook->process || hook->process == current->process) &&
192 (!(hook->flags & WINEVENT_SKIPOWNPROCESS) || hook->process != current->process))
194 if ((!hook->thread || hook->thread == current) &&
195 (!(hook->flags & WINEVENT_SKIPOWNTHREAD) || hook->thread != current))
201 /* find the first non-deleted hook in the chain */
202 inline static struct hook *get_first_valid_hook( struct hook_table *table, int index,
203 int event, user_handle_t win,
204 int object_id, int child_id )
206 struct hook *hook = get_first_hook( table, index );
210 if (hook->proc && run_hook_in_current_thread( hook ))
212 if (event >= hook->event_min && event <= hook->event_max)
214 if (hook->flags & WINEVENT_INCONTEXT) return hook;
216 /* only winevent hooks may be out of context */
217 assert(hook->index + WH_MINHOOK == WH_WINEVENT);
218 post_win_event( hook->owner, event, win, object_id, child_id,
219 hook->proc, hook->module, hook->module_size,
223 hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
228 /* find the next hook in the chain, skipping the deleted ones */
229 static struct hook *get_next_hook( struct thread *thread, struct hook *hook, int event,
230 user_handle_t win, int object_id, int child_id )
232 struct hook_table *global_hooks, *table = hook->table;
233 int index = hook->index;
235 while ((hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) )))
237 if (hook->proc && run_hook_in_current_thread( hook ))
239 if (event >= hook->event_min && event <= hook->event_max)
241 if (hook->flags & WINEVENT_INCONTEXT) return hook;
243 /* only winevent hooks may be out of context */
244 assert(hook->index + WH_MINHOOK == WH_WINEVENT);
245 post_win_event( hook->owner, event, win, object_id, child_id,
246 hook->proc, hook->module, hook->module_size,
251 global_hooks = get_global_hooks( thread );
252 if (global_hooks && table != global_hooks) /* now search through the global table */
254 hook = get_first_valid_hook( global_hooks, index, event, win, object_id, child_id );
259 static void hook_table_dump( struct object *obj, int verbose )
261 /* struct hook_table *table = (struct hook_table *)obj; */
262 fprintf( stderr, "Hook table\n" );
265 static void hook_table_destroy( struct object *obj )
269 struct hook_table *table = (struct hook_table *)obj;
271 for (i = 0; i < NB_HOOKS; i++)
273 while ((hook = get_first_hook( table, i )) != NULL) free_hook( hook );
277 /* remove a hook, freeing it if the chain is not in use */
278 static void remove_hook( struct hook *hook )
280 if (hook->table->counts[hook->index])
281 hook->proc = NULL; /* chain is in use, just mark it and return */
286 /* release a hook chain, removing deleted hooks if the use count drops to 0 */
287 static void release_hook_chain( struct hook_table *table, int index )
289 if (!table->counts[index]) /* use count shouldn't already be 0 */
291 set_error( STATUS_INVALID_PARAMETER );
294 if (!--table->counts[index])
296 struct hook *hook = get_first_hook( table, index );
299 struct hook *next = HOOK_ENTRY( list_next( &table->hooks[hook->index], &hook->chain ) );
300 if (!hook->proc) free_hook( hook );
306 /* remove all global hooks owned by a given thread */
307 void remove_thread_hooks( struct thread *thread )
309 struct hook_table *global_hooks = get_global_hooks( thread );
312 if (!global_hooks) return;
314 /* only low-level keyboard/mouse global hooks can be owned by a thread */
315 for (index = WH_KEYBOARD_LL - WH_MINHOOK; index <= WH_MOUSE_LL - WH_MINHOOK; index++)
317 struct hook *hook = get_first_hook( global_hooks, index );
320 struct hook *next = HOOK_ENTRY( list_next( &global_hooks->hooks[index], &hook->chain ) );
321 if (hook->thread == thread) remove_hook( hook );
327 /* get a bitmap of active hooks in a hook table */
328 static int is_hook_active( struct hook_table *table, int index )
330 struct hook *hook = get_first_hook( table, index );
334 if (hook->proc && run_hook_in_current_thread( hook )) return 1;
335 hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
340 /* get a bitmap of all active hooks for the current thread */
341 unsigned int get_active_hooks(void)
343 struct hook_table *table = get_queue_hooks( current );
344 struct hook_table *global_hooks = get_global_hooks( current );
345 unsigned int ret = 1 << 31; /* set high bit to indicate that the bitmap is valid */
348 for (id = WH_MINHOOK; id <= WH_WINEVENT; id++)
350 if ((table && is_hook_active( table, id - WH_MINHOOK )) ||
351 (global_hooks && is_hook_active( global_hooks, id - WH_MINHOOK )))
352 ret |= 1 << (id - WH_MINHOOK);
357 /* set a window hook */
358 DECL_HANDLER(set_hook)
360 struct process *process = NULL;
361 struct thread *thread = NULL;
362 struct desktop *desktop;
366 size_t module_size = get_req_data_size();
368 if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
370 set_error( STATUS_INVALID_PARAMETER );
374 if (!(desktop = get_thread_desktop( current, DESKTOP_HOOKCONTROL ))) return;
376 if (req->pid && !(process = get_process_from_id( req->pid ))) goto done;
380 if (!(thread = get_thread_from_id( req->tid ))) goto done;
381 if (process && process != thread->process)
383 set_error( STATUS_INVALID_PARAMETER );
388 if (req->id == WH_KEYBOARD_LL || req->id == WH_MOUSE_LL)
390 /* low-level hardware hooks are special: always global, but without a module */
391 thread = (struct thread *)grab_object( current );
397 /* out of context hooks do not need a module handle */
398 if (!module_size && (req->flags & WINEVENT_INCONTEXT))
400 set_error( STATUS_INVALID_PARAMETER );
403 if (!(module = memdup( get_req_data(), module_size ))) goto done;
412 if ((hook = add_hook( desktop, thread, req->id - WH_MINHOOK, global )))
414 hook->owner = (struct thread *)grab_object( current );
415 hook->process = process ? (struct process *)grab_object( process ) : NULL;
416 hook->event_min = req->event_min;
417 hook->event_max = req->event_max;
418 hook->flags = req->flags;
419 hook->proc = req->proc;
420 hook->unicode = req->unicode;
421 hook->module = module;
422 hook->module_size = module_size;
423 reply->handle = hook->handle;
424 reply->active_hooks = get_active_hooks();
426 else if (module) free( module );
429 if (process) release_object( process );
430 if (thread) release_object( thread );
431 release_object( desktop );
435 /* remove a window hook */
436 DECL_HANDLER(remove_hook)
442 if (!(hook = get_user_object( req->handle, USER_HOOK )))
444 set_error( STATUS_INVALID_HANDLE );
450 if (!req->proc || req->id < WH_MINHOOK || req->id > WH_WINEVENT)
452 set_error( STATUS_INVALID_PARAMETER );
455 if (!(hook = find_hook( current, req->id - WH_MINHOOK, req->proc )))
457 set_error( STATUS_INVALID_PARAMETER );
462 reply->active_hooks = get_active_hooks();
466 /* start calling a hook chain */
467 DECL_HANDLER(start_hook_chain)
470 struct hook_table *table = get_queue_hooks( current );
472 if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
474 set_error( STATUS_INVALID_PARAMETER );
478 reply->active_hooks = get_active_hooks();
480 if (!table || !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK, req->event,
481 req->window, req->object_id, req->child_id )))
483 /* try global table */
484 if (!(table = get_global_hooks( current )) ||
485 !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK, req->event,
486 req->window, req->object_id, req->child_id )))
487 return; /* no hook set */
490 if (hook->thread && hook->thread != current) /* must run in other thread */
492 reply->pid = get_process_id( hook->thread->process );
493 reply->tid = get_thread_id( hook->thread );
500 reply->proc = hook->proc;
501 reply->handle = hook->handle;
502 reply->unicode = hook->unicode;
503 table->counts[hook->index]++;
504 if (hook->module) set_reply_data( hook->module, hook->module_size );
508 /* finished calling a hook chain */
509 DECL_HANDLER(finish_hook_chain)
511 struct hook_table *table = get_queue_hooks( current );
512 struct hook_table *global_hooks = get_global_hooks( current );
513 int index = req->id - WH_MINHOOK;
515 if (req->id < WH_MINHOOK || req->id > WH_WINEVENT)
517 set_error( STATUS_INVALID_PARAMETER );
520 if (table) release_hook_chain( table, index );
521 if (global_hooks) release_hook_chain( global_hooks, index );
525 /* get the next hook to call */
526 DECL_HANDLER(get_next_hook)
528 struct hook *hook, *next;
530 if (!(hook = get_user_object( req->handle, USER_HOOK ))) return;
531 if (hook->thread && (hook->thread != current))
533 set_error( STATUS_INVALID_HANDLE );
536 if ((next = get_next_hook( current, hook, req->event, req->window, req->object_id, req->child_id )))
538 reply->next = next->handle;
539 reply->id = next->index + WH_MINHOOK;
540 reply->prev_unicode = hook->unicode;
541 reply->next_unicode = next->unicode;
542 if (next->module) set_reply_data( next->module, next->module_size );
543 if (next->thread && next->thread != current)
545 reply->pid = get_process_id( next->thread->process );
546 reply->tid = get_thread_id( next->thread );
553 reply->proc = next->proc;