git.oblomov.eu Git - wine/blob - server/winstation.c

   1 /*
   2  * Server-side window stations and desktops handling
   3  *
   4  * Copyright (C) 2002, 2005 Alexandre Julliard
   5  *
   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.
  10  *
  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.
  15  *
  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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26
  27 #include "ntstatus.h"
  28 #define WIN32_NO_STATUS
  29 #include "windef.h"
  30 #include "winbase.h"
  31 #include "winuser.h"
  32 #include "winternl.h"
  33
  34 #include "object.h"
  35 #include "handle.h"
  36 #include "request.h"
  37 #include "process.h"
  38 #include "user.h"
  39 #include "file.h"
  40 #include "security.h"
  41 #include "wine/unicode.h"
  42
  43
  44 static struct list winstation_list = LIST_INIT(winstation_list);
  45 static struct namespace *winstation_namespace;
  46
  47 static void winstation_dump( struct object *obj, int verbose );
  48 static struct object_type *winstation_get_type( struct object *obj );
  49 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  50 static void winstation_destroy( struct object *obj );
  51 static unsigned int winstation_map_access( struct object *obj, unsigned int access );
  52 static void desktop_dump( struct object *obj, int verbose );
  53 static struct object_type *desktop_get_type( struct object *obj );
  54 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  55 static void desktop_destroy( struct object *obj );
  56 static unsigned int desktop_map_access( struct object *obj, unsigned int access );
  57
  58 static const struct object_ops winstation_ops =
  59 {
  60     sizeof(struct winstation),    /* size */
  61     winstation_dump,              /* dump */
  62     winstation_get_type,          /* get_type */
  63     no_add_queue,                 /* add_queue */
  64     NULL,                         /* remove_queue */
  65     NULL,                         /* signaled */
  66     NULL,                         /* satisfied */
  67     no_signal,                    /* signal */
  68     no_get_fd,                    /* get_fd */
  69     winstation_map_access,        /* map_access */
  70     default_get_sd,               /* get_sd */
  71     default_set_sd,               /* set_sd */
  72     no_lookup_name,               /* lookup_name */
  73     no_open_file,                 /* open_file */
  74     winstation_close_handle,      /* close_handle */
  75     winstation_destroy            /* destroy */
  76 };
  77
  78
  79 static const struct object_ops desktop_ops =
  80 {
  81     sizeof(struct desktop),       /* size */
  82     desktop_dump,                 /* dump */
  83     desktop_get_type,             /* get_type */
  84     no_add_queue,                 /* add_queue */
  85     NULL,                         /* remove_queue */
  86     NULL,                         /* signaled */
  87     NULL,                         /* satisfied */
  88     no_signal,                    /* signal */
  89     no_get_fd,                    /* get_fd */
  90     desktop_map_access,           /* map_access */
  91     default_get_sd,               /* get_sd */
  92     default_set_sd,               /* set_sd */
  93     no_lookup_name,               /* lookup_name */
  94     no_open_file,                 /* open_file */
  95     desktop_close_handle,         /* close_handle */
  96     desktop_destroy               /* destroy */
  97 };
  98
  99 #define DESKTOP_ALL_ACCESS 0x01ff
 100
 101 /* create a winstation object */
 102 static struct winstation *create_winstation( const struct unicode_str *name, unsigned int attr,
 103                                              unsigned int flags )
 104 {
 105     struct winstation *winstation;
 106
 107     if (!winstation_namespace && !(winstation_namespace = create_namespace( 7 )))
 108         return NULL;
 109
 110     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))  /* no backslash allowed in name */
 111     {
 112         set_error( STATUS_INVALID_PARAMETER );
 113         return NULL;
 114     }
 115
 116     if ((winstation = create_named_object( winstation_namespace, &winstation_ops, name, attr )))
 117     {
 118         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 119         {
 120             /* initialize it if it didn't already exist */
 121             winstation->flags = flags;
 122             winstation->clipboard = NULL;
 123             winstation->atom_table = NULL;
 124             list_add_tail( &winstation_list, &winstation->entry );
 125             list_init( &winstation->desktops );
 126         }
 127     }
 128     return winstation;
 129 }
 130
 131 static void winstation_dump( struct object *obj, int verbose )
 132 {
 133     struct winstation *winstation = (struct winstation *)obj;
 134
 135     fprintf( stderr, "Winstation flags=%x clipboard=%p atoms=%p ",
 136              winstation->flags, winstation->clipboard, winstation->atom_table );
 137     dump_object_name( &winstation->obj );
 138     fputc( '\n', stderr );
 139 }
 140
 141 static struct object_type *winstation_get_type( struct object *obj )
 142 {
 143     static const WCHAR name[] = {'W','i','n','d','o','w','S','t','a','t','i','o','n'};
 144     static const struct unicode_str str = { name, sizeof(name) };
 145     return get_object_type( &str );
 146 }
 147
 148 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 149 {
 150     return (process->winstation != handle);
 151 }
 152
 153 static void winstation_destroy( struct object *obj )
 154 {
 155     struct winstation *winstation = (struct winstation *)obj;
 156
 157     list_remove( &winstation->entry );
 158     if (winstation->clipboard) release_object( winstation->clipboard );
 159     if (winstation->atom_table) release_object( winstation->atom_table );
 160 }
 161
 162 static unsigned int winstation_map_access( struct object *obj, unsigned int access )
 163 {
 164     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | WINSTA_ENUMDESKTOPS | WINSTA_READATTRIBUTES |
 165                                             WINSTA_ENUMERATE | WINSTA_READSCREEN;
 166     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | WINSTA_ACCESSCLIPBOARD | WINSTA_CREATEDESKTOP |
 167                                             WINSTA_WRITEATTRIBUTES;
 168     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | WINSTA_ACCESSGLOBALATOMS | WINSTA_EXITWINDOWS;
 169     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_REQUIRED | WINSTA_ALL_ACCESS;
 170     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 171 }
 172
 173 /* retrieve the process window station, checking the handle access rights */
 174 struct winstation *get_process_winstation( struct process *process, unsigned int access )
 175 {
 176     return (struct winstation *)get_handle_obj( process, process->winstation,
 177                                                 access, &winstation_ops );
 178 }
 179
 180 /* build the full name of a desktop object */
 181 static WCHAR *build_desktop_name( const struct unicode_str *name,
 182                                   struct winstation *winstation, struct unicode_str *res )
 183 {
 184     const WCHAR *winstation_name;
 185     WCHAR *full_name;
 186     data_size_t winstation_len;
 187
 188     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))
 189     {
 190         set_error( STATUS_INVALID_PARAMETER );
 191         return NULL;
 192     }
 193
 194     if (!(winstation_name = get_object_name( &winstation->obj, &winstation_len )))
 195         winstation_len = 0;
 196
 197     res->len = winstation_len + name->len + sizeof(WCHAR);
 198     if (!(full_name = mem_alloc( res->len ))) return NULL;
 199     memcpy( full_name, winstation_name, winstation_len );
 200     full_name[winstation_len / sizeof(WCHAR)] = '\\';
 201     memcpy( full_name + winstation_len / sizeof(WCHAR) + 1, name->str, name->len );
 202     res->str = full_name;
 203     return full_name;
 204 }
 205
 206 /* retrieve a pointer to a desktop object */
 207 struct desktop *get_desktop_obj( struct process *process, obj_handle_t handle, unsigned int access )
 208 {
 209     return (struct desktop *)get_handle_obj( process, handle, access, &desktop_ops );
 210 }
 211
 212 /* create a desktop object */
 213 static struct desktop *create_desktop( const struct unicode_str *name, unsigned int attr,
 214                                        unsigned int flags, struct winstation *winstation )
 215 {
 216     struct desktop *desktop;
 217     struct unicode_str full_str;
 218     WCHAR *full_name;
 219
 220     if (!(full_name = build_desktop_name( name, winstation, &full_str ))) return NULL;
 221
 222     if ((desktop = create_named_object( winstation_namespace, &desktop_ops, &full_str, attr )))
 223     {
 224         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 225         {
 226             /* initialize it if it didn't already exist */
 227             desktop->flags = flags;
 228             desktop->winstation = (struct winstation *)grab_object( winstation );
 229             desktop->top_window = NULL;
 230             desktop->msg_window = NULL;
 231             desktop->global_hooks = NULL;
 232             desktop->close_timeout = NULL;
 233             desktop->users = 0;
 234             list_add_tail( &winstation->desktops, &desktop->entry );
 235         }
 236     }
 237     free( full_name );
 238     return desktop;
 239 }
 240
 241 static void desktop_dump( struct object *obj, int verbose )
 242 {
 243     struct desktop *desktop = (struct desktop *)obj;
 244
 245     fprintf( stderr, "Desktop flags=%x winstation=%p top_win=%p hooks=%p ",
 246              desktop->flags, desktop->winstation, desktop->top_window, desktop->global_hooks );
 247     dump_object_name( &desktop->obj );
 248     fputc( '\n', stderr );
 249 }
 250
 251 static struct object_type *desktop_get_type( struct object *obj )
 252 {
 253     static const WCHAR name[] = {'D','e','s','k','t','o','p'};
 254     static const struct unicode_str str = { name, sizeof(name) };
 255     return get_object_type( &str );
 256 }
 257
 258 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 259 {
 260     struct thread *thread;
 261
 262     /* check if the handle is currently used by the process or one of its threads */
 263     if (process->desktop == handle) return 0;
 264     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 265         if (thread->desktop == handle) return 0;
 266     return 1;
 267 }
 268
 269 static void desktop_destroy( struct object *obj )
 270 {
 271     struct desktop *desktop = (struct desktop *)obj;
 272
 273     if (desktop->top_window) destroy_window( desktop->top_window );
 274     if (desktop->msg_window) destroy_window( desktop->msg_window );
 275     if (desktop->global_hooks) release_object( desktop->global_hooks );
 276     if (desktop->close_timeout) remove_timeout_user( desktop->close_timeout );
 277     list_remove( &desktop->entry );
 278     release_object( desktop->winstation );
 279 }
 280
 281 static unsigned int desktop_map_access( struct object *obj, unsigned int access )
 282 {
 283     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | DESKTOP_READOBJECTS | DESKTOP_ENUMERATE;
 284     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | DESKTOP_CREATEMENU | DESKTOP_CREATEWINDOW |
 285                                             DESKTOP_HOOKCONTROL | DESKTOP_JOURNALRECORD | DESKTOP_JOURNALPLAYBACK |
 286                                             DESKTOP_WRITEOBJECTS;
 287     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | DESKTOP_SWITCHDESKTOP;
 288     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_REQUIRED | DESKTOP_ALL_ACCESS;
 289     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 290 }
 291
 292 /* retrieve the thread desktop, checking the handle access rights */
 293 struct desktop *get_thread_desktop( struct thread *thread, unsigned int access )
 294 {
 295     return get_desktop_obj( thread->process, thread->desktop, access );
 296 }
 297
 298 /* set the process default desktop handle */
 299 void set_process_default_desktop( struct process *process, struct desktop *desktop,
 300                                   obj_handle_t handle )
 301 {
 302     struct thread *thread;
 303     struct desktop *old_desktop;
 304
 305     if (process->desktop == handle) return;  /* nothing to do */
 306
 307     if (!(old_desktop = get_desktop_obj( process, process->desktop, 0 ))) clear_error();
 308     process->desktop = handle;
 309
 310     /* set desktop for threads that don't have one yet */
 311     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 312         if (!thread->desktop) thread->desktop = handle;
 313
 314     if (!process->is_system)
 315     {
 316         desktop->users++;
 317         if (desktop->close_timeout)
 318         {
 319             remove_timeout_user( desktop->close_timeout );
 320             desktop->close_timeout = NULL;
 321         }
 322         if (old_desktop) old_desktop->users--;
 323     }
 324
 325     if (old_desktop) release_object( old_desktop );
 326 }
 327
 328 /* connect a process to its window station */
 329 void connect_process_winstation( struct process *process, struct thread *parent )
 330 {
 331     struct winstation *winstation = NULL;
 332     struct desktop *desktop = NULL;
 333     obj_handle_t handle;
 334
 335     /* check for an inherited winstation handle (don't ask...) */
 336     if ((handle = find_inherited_handle( process, &winstation_ops )))
 337     {
 338         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 339     }
 340     else if (parent && parent->process->winstation)
 341     {
 342         handle = duplicate_handle( parent->process, parent->process->winstation,
 343                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 344         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 345     }
 346     if (!winstation) goto done;
 347     process->winstation = handle;
 348
 349     if ((handle = find_inherited_handle( process, &desktop_ops )))
 350     {
 351         desktop = get_desktop_obj( process, handle, 0 );
 352         if (!desktop || desktop->winstation != winstation) goto done;
 353     }
 354     else if (parent && parent->desktop)
 355     {
 356         desktop = get_desktop_obj( parent->process, parent->desktop, 0 );
 357         if (!desktop || desktop->winstation != winstation) goto done;
 358         handle = duplicate_handle( parent->process, parent->desktop,
 359                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 360     }
 361
 362     if (handle) set_process_default_desktop( process, desktop, handle );
 363
 364 done:
 365     if (desktop) release_object( desktop );
 366     if (winstation) release_object( winstation );
 367     clear_error();
 368 }
 369
 370 static void close_desktop_timeout( void *private )
 371 {
 372     struct desktop *desktop = private;
 373
 374     desktop->close_timeout = NULL;
 375     unlink_named_object( &desktop->obj );  /* make sure no other process can open it */
 376     close_desktop_window( desktop );  /* and signal the owner to quit */
 377 }
 378
 379 /* close the desktop of a given process */
 380 void close_process_desktop( struct process *process )
 381 {
 382     struct desktop *desktop;
 383
 384     if (process->desktop && (desktop = get_desktop_obj( process, process->desktop, 0 )))
 385     {
 386         assert( desktop->users > 0 );
 387         desktop->users--;
 388         /* if we have one remaining user, it has to be the manager of the desktop window */
 389         if (desktop->users == 1 && get_top_window_owner( desktop ))
 390         {
 391             assert( !desktop->close_timeout );
 392             desktop->close_timeout = add_timeout_user( -TICKS_PER_SEC, close_desktop_timeout, desktop );
 393         }
 394         release_object( desktop );
 395     }
 396     clear_error();  /* ignore errors */
 397 }
 398
 399 /* close the desktop of a given thread */
 400 void close_thread_desktop( struct thread *thread )
 401 {
 402     obj_handle_t handle = thread->desktop;
 403
 404     thread->desktop = 0;
 405     if (handle) close_handle( thread->process, handle );
 406 }
 407
 408 /* set the reply data from the object name */
 409 static void set_reply_data_obj_name( struct object *obj )
 410 {
 411     data_size_t len;
 412     const WCHAR *ptr, *name = get_object_name( obj, &len );
 413
 414     /* if there is a backslash return the part of the name after it */
 415     if (name && (ptr = memchrW( name, '\\', len/sizeof(WCHAR) )))
 416     {
 417         len -= (ptr + 1 - name) * sizeof(WCHAR);
 418         name = ptr + 1;
 419     }
 420     if (name) set_reply_data( name, min( len, get_reply_max_size() ));
 421 }
 422
 423 /* create a window station */
 424 DECL_HANDLER(create_winstation)
 425 {
 426     struct winstation *winstation;
 427     struct unicode_str name;
 428
 429     reply->handle = 0;
 430     get_req_unicode_str( &name );
 431     if ((winstation = create_winstation( &name, req->attributes, req->flags )))
 432     {
 433         reply->handle = alloc_handle( current->process, winstation, req->access, req->attributes );
 434         release_object( winstation );
 435     }
 436 }
 437
 438 /* open a handle to a window station */
 439 DECL_HANDLER(open_winstation)
 440 {
 441     struct unicode_str name;
 442
 443     get_req_unicode_str( &name );
 444     if (winstation_namespace)
 445         reply->handle = open_object( winstation_namespace, &name, &winstation_ops, req->access,
 446                                      req->attributes );
 447     else
 448         set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 449 }
 450
 451
 452 /* close a window station */
 453 DECL_HANDLER(close_winstation)
 454 {
 455     struct winstation *winstation;
 456
 457     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 458                                                            0, &winstation_ops )))
 459     {
 460         if (close_handle( current->process, req->handle )) set_error( STATUS_ACCESS_DENIED );
 461         release_object( winstation );
 462     }
 463 }
 464
 465
 466 /* get the process current window station */
 467 DECL_HANDLER(get_process_winstation)
 468 {
 469     reply->handle = current->process->winstation;
 470 }
 471
 472
 473 /* set the process current window station */
 474 DECL_HANDLER(set_process_winstation)
 475 {
 476     struct winstation *winstation;
 477
 478     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 479                                                            0, &winstation_ops )))
 480     {
 481         /* FIXME: should we close the old one? */
 482         current->process->winstation = req->handle;
 483         release_object( winstation );
 484     }
 485 }
 486
 487 /* create a desktop */
 488 DECL_HANDLER(create_desktop)
 489 {
 490     struct desktop *desktop;
 491     struct winstation *winstation;
 492     struct unicode_str name;
 493
 494     reply->handle = 0;
 495     get_req_unicode_str( &name );
 496     if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
 497     {
 498         if ((desktop = create_desktop( &name, req->attributes, req->flags, winstation )))
 499         {
 500             reply->handle = alloc_handle( current->process, desktop, req->access, req->attributes );
 501             release_object( desktop );
 502         }
 503         release_object( winstation );
 504     }
 505 }
 506
 507 /* open a handle to a desktop */
 508 DECL_HANDLER(open_desktop)
 509 {
 510     struct winstation *winstation;
 511     struct unicode_str name;
 512
 513     get_req_unicode_str( &name );
 514
 515     /* FIXME: check access rights */
 516     if (!req->winsta)
 517         winstation = get_process_winstation( current->process, 0 );
 518     else
 519         winstation = (struct winstation *)get_handle_obj( current->process, req->winsta, 0, &winstation_ops );
 520
 521     if (winstation)
 522     {
 523         struct unicode_str full_str;
 524         WCHAR *full_name;
 525
 526         if ((full_name = build_desktop_name( &name, winstation, &full_str )))
 527         {
 528             reply->handle = open_object( winstation_namespace, &full_str, &desktop_ops, req->access,
 529                                          req->attributes );
 530             free( full_name );
 531         }
 532         release_object( winstation );
 533     }
 534 }
 535
 536
 537 /* close a desktop */
 538 DECL_HANDLER(close_desktop)
 539 {
 540     struct desktop *desktop;
 541
 542     /* make sure it is a desktop handle */
 543     if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
 544                                                      0, &desktop_ops )))
 545     {
 546         if (close_handle( current->process, req->handle )) set_error( STATUS_DEVICE_BUSY );
 547         release_object( desktop );
 548     }
 549 }
 550
 551
 552 /* get the thread current desktop */
 553 DECL_HANDLER(get_thread_desktop)
 554 {
 555     struct thread *thread;
 556
 557     if (!(thread = get_thread_from_id( req->tid ))) return;
 558     reply->handle = thread->desktop;
 559     release_object( thread );
 560 }
 561
 562
 563 /* set the thread current desktop */
 564 DECL_HANDLER(set_thread_desktop)
 565 {
 566     struct desktop *old_desktop, *new_desktop;
 567     struct winstation *winstation;
 568
 569     if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 570         return;
 571
 572     if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
 573     {
 574         release_object( winstation );
 575         return;
 576     }
 577     if (new_desktop->winstation != winstation)
 578     {
 579         set_error( STATUS_ACCESS_DENIED );
 580         release_object( new_desktop );
 581         release_object( winstation );
 582         return;
 583     }
 584
 585     /* check if we are changing to a new desktop */
 586
 587     if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
 588         clear_error();  /* ignore error */
 589
 590     /* when changing desktop, we can't have any users on the current one */
 591     if (old_desktop != new_desktop && current->desktop_users > 0)
 592         set_error( STATUS_DEVICE_BUSY );
 593     else
 594         current->desktop = req->handle;  /* FIXME: should we close the old one? */
 595
 596     if (!current->process->desktop)
 597         set_process_default_desktop( current->process, new_desktop, req->handle );
 598
 599     if (old_desktop != new_desktop && current->queue) detach_thread_input( current );
 600
 601     if (old_desktop) release_object( old_desktop );
 602     release_object( new_desktop );
 603     release_object( winstation );
 604 }
 605
 606
 607 /* get/set information about a user object (window station or desktop) */
 608 DECL_HANDLER(set_user_object_info)
 609 {
 610     struct object *obj;
 611
 612     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 613
 614     if (obj->ops == &desktop_ops)
 615     {
 616         struct desktop *desktop = (struct desktop *)obj;
 617         reply->is_desktop = 1;
 618         reply->old_obj_flags = desktop->flags;
 619         if (req->flags & SET_USER_OBJECT_FLAGS) desktop->flags = req->obj_flags;
 620     }
 621     else if (obj->ops == &winstation_ops)
 622     {
 623         struct winstation *winstation = (struct winstation *)obj;
 624         reply->is_desktop = 0;
 625         reply->old_obj_flags = winstation->flags;
 626         if (req->flags & SET_USER_OBJECT_FLAGS) winstation->flags = req->obj_flags;
 627     }
 628     else
 629     {
 630         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 631         release_object( obj );
 632         return;
 633     }
 634     if (get_reply_max_size()) set_reply_data_obj_name( obj );
 635     release_object( obj );
 636 }
 637
 638
 639 /* enumerate window stations */
 640 DECL_HANDLER(enum_winstation)
 641 {
 642     unsigned int index = 0;
 643     struct winstation *winsta;
 644
 645     LIST_FOR_EACH_ENTRY( winsta, &winstation_list, struct winstation, entry )
 646     {
 647         unsigned int access = WINSTA_ENUMERATE;
 648         if (req->index > index++) continue;
 649         if (!check_object_access( &winsta->obj, &access )) continue;
 650         set_reply_data_obj_name( &winsta->obj );
 651         clear_error();
 652         reply->next = index;
 653         return;
 654     }
 655     set_error( STATUS_NO_MORE_ENTRIES );
 656 }
 657
 658
 659 /* enumerate desktops */
 660 DECL_HANDLER(enum_desktop)
 661 {
 662     struct winstation *winstation;
 663     struct desktop *desktop;
 664     unsigned int index = 0;
 665
 666     if (!(winstation = (struct winstation *)get_handle_obj( current->process, req->winstation,
 667                                                             WINSTA_ENUMDESKTOPS, &winstation_ops )))
 668         return;
 669
 670     LIST_FOR_EACH_ENTRY( desktop, &winstation->desktops, struct desktop, entry )
 671     {
 672         unsigned int access = DESKTOP_ENUMERATE;
 673         if (req->index > index++) continue;
 674         if (!desktop->obj.name) continue;
 675         if (!check_object_access( &desktop->obj, &access )) continue;
 676         set_reply_data_obj_name( &desktop->obj );
 677         release_object( winstation );
 678         clear_error();
 679         reply->next = index;
 680         return;
 681     }
 682
 683     release_object( winstation );
 684     set_error( STATUS_NO_MORE_ENTRIES );
 685 }