2 * Server-side window hooks support
4 * Copyright (C) 2002 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include "wine/port.h"
38 struct list chain; /* hook chain entry */
39 user_handle_t handle; /* user handle for this hook */
40 struct thread *thread; /* thread owning the hook */
41 int index; /* hook table index */
42 void *proc; /* hook function */
43 int unicode; /* is it a unicode hook? */
44 WCHAR *module; /* module name for global hooks */
48 #define NB_HOOKS (WH_MAXHOOK-WH_MINHOOK+1)
49 #define HOOK_ENTRY(p) LIST_ENTRY( (p), struct hook, chain )
53 struct object obj; /* object header */
54 struct list hooks[NB_HOOKS]; /* array of hook chains */
55 int counts[NB_HOOKS]; /* use counts for each hook chain */
58 static void hook_table_dump( struct object *obj, int verbose );
59 static void hook_table_destroy( struct object *obj );
61 static const struct object_ops hook_table_ops =
63 sizeof(struct hook_table), /* size */
64 hook_table_dump, /* dump */
65 no_add_queue, /* add_queue */
66 NULL, /* remove_queue */
69 no_get_fd, /* get_fd */
70 no_get_file_info, /* get_file_info */
71 hook_table_destroy /* destroy */
75 static struct hook_table *global_hooks;
77 /* create a new hook table */
78 static struct hook_table *alloc_hook_table(void)
80 struct hook_table *table;
83 if ((table = alloc_object( &hook_table_ops, -1 )))
85 for (i = 0; i < NB_HOOKS; i++)
87 list_init( &table->hooks[i] );
94 /* create a new hook and add it to the specified table */
95 static struct hook *add_hook( struct thread *thread, int index )
98 struct hook_table *table = thread ? thread->hooks : global_hooks;
102 if (!(table = alloc_hook_table())) return NULL;
103 if (thread) thread->hooks = table;
104 else global_hooks = table;
106 if (!(hook = mem_alloc( sizeof(*hook) ))) return NULL;
108 if (!(hook->handle = alloc_user_handle( hook, USER_HOOK )))
113 hook->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
115 list_add_head( &table->hooks[index], &hook->chain );
119 /* free a hook, removing it from its chain */
120 static void free_hook( struct hook *hook )
122 free_user_handle( hook->handle );
123 if (hook->module) free( hook->module );
124 if (hook->thread) release_object( hook->thread );
125 list_remove( &hook->chain );
129 /* find a hook from its index and proc */
130 static struct hook *find_hook( struct thread *thread, int index, void *proc )
133 struct hook_table *table = thread->hooks;
137 LIST_FOR_EACH( p, &table->hooks[index] )
139 struct hook *hook = HOOK_ENTRY( p );
140 if (hook->proc == proc) return hook;
146 /* get the hook table that a given hook belongs to */
147 inline static struct hook_table *get_table( struct hook *hook )
149 return hook->thread ? hook->thread->hooks : global_hooks;
152 /* get the first hook in the chain */
153 inline static struct hook *get_first_hook( struct hook_table *table, int index )
155 struct list *elem = list_head( &table->hooks[index] );
156 return elem ? HOOK_ENTRY( elem ) : NULL;
159 /* find the first non-deleted hook in the chain */
160 inline static struct hook *get_first_valid_hook( struct hook_table *table, int index )
162 struct hook *hook = get_first_hook( table, index );
163 while (hook && !hook->proc)
164 hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
168 /* find the next hook in the chain, skipping the deleted ones */
169 static struct hook *get_next_hook( struct hook *hook )
171 struct hook_table *table = get_table( hook );
172 int index = hook->index;
174 while ((hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) )))
176 if (hook->proc) return hook;
178 if (global_hooks && table != global_hooks) /* now search through the global table */
180 hook = get_first_valid_hook( global_hooks, index );
185 static void hook_table_dump( struct object *obj, int verbose )
187 struct hook_table *table = (struct hook_table *)obj;
188 if (table == global_hooks) fprintf( stderr, "Global hook table\n" );
189 else fprintf( stderr, "Hook table\n" );
192 static void hook_table_destroy( struct object *obj )
196 struct hook_table *table = (struct hook_table *)obj;
198 for (i = 0; i < NB_HOOKS; i++)
200 while ((hook = get_first_hook( table, i )) != NULL) free_hook( hook );
204 /* free the global hooks table */
205 void close_global_hooks(void)
207 if (global_hooks) release_object( global_hooks );
210 /* remove a hook, freeing it if the chain is not in use */
211 static void remove_hook( struct hook *hook )
213 struct hook_table *table = get_table( hook );
214 if (table->counts[hook->index])
215 hook->proc = NULL; /* chain is in use, just mark it and return */
220 /* release a hook chain, removing deleted hooks if the use count drops to 0 */
221 static void release_hook_chain( struct hook_table *table, int index )
223 if (!table->counts[index]) /* use count shouldn't already be 0 */
225 set_error( STATUS_INVALID_PARAMETER );
228 if (!--table->counts[index])
230 struct hook *hook = get_first_hook( table, index );
233 struct hook *next = HOOK_ENTRY( list_next( &table->hooks[hook->index], &hook->chain ) );
234 if (!hook->proc) free_hook( hook );
241 /* set a window hook */
242 DECL_HANDLER(set_hook)
244 struct thread *thread;
247 size_t module_size = get_req_data_size();
249 if (!req->proc || req->id < WH_MINHOOK || req->id > WH_MAXHOOK)
251 set_error( STATUS_INVALID_PARAMETER );
258 set_error( STATUS_INVALID_PARAMETER );
261 if (!(module = memdup( get_req_data(), module_size ))) return;
267 if (!(thread = get_thread_from_id( req->tid ))) return;
270 if ((hook = add_hook( thread, req->id - WH_MINHOOK )))
272 hook->proc = req->proc;
273 hook->unicode = req->unicode;
274 hook->module = module;
275 hook->module_size = module_size;
276 reply->handle = hook->handle;
278 else if (module) free( module );
280 if (thread) release_object( thread );
284 /* remove a window hook */
285 DECL_HANDLER(remove_hook)
289 if (req->handle) hook = get_user_object( req->handle, USER_HOOK );
292 if (!req->proc || req->id < WH_MINHOOK || req->id > WH_MAXHOOK)
294 set_error( STATUS_INVALID_PARAMETER );
297 if (!(hook = find_hook( current, req->id - WH_MINHOOK, req->proc )))
298 set_error( STATUS_INVALID_PARAMETER );
300 if (hook) remove_hook( hook );
304 /* start calling a hook chain */
305 DECL_HANDLER(start_hook_chain)
308 struct hook_table *table = current->hooks;
310 if (req->id < WH_MINHOOK || req->id > WH_MAXHOOK)
312 set_error( STATUS_INVALID_PARAMETER );
316 if (!table || !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK )))
318 /* try global table */
319 if (!(table = global_hooks) ||
320 !(hook = get_first_valid_hook( global_hooks, req->id - WH_MINHOOK )))
321 return; /* no hook set */
323 reply->handle = hook->handle;
324 reply->proc = hook->proc;
325 reply->unicode = hook->unicode;
326 table->counts[hook->index]++;
327 if (hook->module) set_reply_data( hook->module, hook->module_size );
331 /* finished calling a hook chain */
332 DECL_HANDLER(finish_hook_chain)
334 struct hook_table *table = current->hooks;
335 int index = req->id - WH_MINHOOK;
337 if (req->id < WH_MINHOOK || req->id > WH_MAXHOOK)
339 set_error( STATUS_INVALID_PARAMETER );
342 if (table) release_hook_chain( table, index );
343 if (global_hooks) release_hook_chain( global_hooks, index );
347 /* get the next hook to call */
348 DECL_HANDLER(get_next_hook)
350 struct hook *hook, *next;
352 if (!(hook = get_user_object( req->handle, USER_HOOK ))) return;
353 if (hook->thread && (hook->thread != current))
355 set_error( STATUS_INVALID_HANDLE );
358 if ((next = get_next_hook( hook )))
360 reply->next = next->handle;
361 reply->id = next->index + WH_MINHOOK;
362 reply->proc = next->proc;
363 reply->prev_unicode = hook->unicode;
364 reply->next_unicode = next->unicode;
365 if (next->module) set_reply_data( next->module, next->module_size );