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->global_hooks = NULL;
 231             desktop->close_timeout = NULL;
 232             desktop->users = 0;
 233             list_add_tail( &winstation->desktops, &desktop->entry );
 234         }
 235     }
 236     free( full_name );
 237     return desktop;
 238 }
 239
 240 static void desktop_dump( struct object *obj, int verbose )
 241 {
 242     struct desktop *desktop = (struct desktop *)obj;
 243
 244     fprintf( stderr, "Desktop flags=%x winstation=%p top_win=%p hooks=%p ",
 245              desktop->flags, desktop->winstation, desktop->top_window, desktop->global_hooks );
 246     dump_object_name( &desktop->obj );
 247     fputc( '\n', stderr );
 248 }
 249
 250 static struct object_type *desktop_get_type( struct object *obj )
 251 {
 252     static const WCHAR name[] = {'D','e','s','k','t','o','p'};
 253     static const struct unicode_str str = { name, sizeof(name) };
 254     return get_object_type( &str );
 255 }
 256
 257 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 258 {
 259     struct thread *thread;
 260
 261     /* check if the handle is currently used by the process or one of its threads */
 262     if (process->desktop == handle) return 0;
 263     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 264         if (thread->desktop == handle) return 0;
 265     return 1;
 266 }
 267
 268 static void desktop_destroy( struct object *obj )
 269 {
 270     struct desktop *desktop = (struct desktop *)obj;
 271
 272     if (desktop->top_window) destroy_window( desktop->top_window );
 273     if (desktop->global_hooks) release_object( desktop->global_hooks );
 274     if (desktop->close_timeout) remove_timeout_user( desktop->close_timeout );
 275     list_remove( &desktop->entry );
 276     release_object( desktop->winstation );
 277 }
 278
 279 static unsigned int desktop_map_access( struct object *obj, unsigned int access )
 280 {
 281     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | DESKTOP_READOBJECTS | DESKTOP_ENUMERATE;
 282     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | DESKTOP_CREATEMENU | DESKTOP_CREATEWINDOW |
 283                                             DESKTOP_HOOKCONTROL | DESKTOP_JOURNALRECORD | DESKTOP_JOURNALPLAYBACK |
 284                                             DESKTOP_WRITEOBJECTS;
 285     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | DESKTOP_SWITCHDESKTOP;
 286     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_REQUIRED | DESKTOP_ALL_ACCESS;
 287     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 288 }
 289
 290 /* retrieve the thread desktop, checking the handle access rights */
 291 struct desktop *get_thread_desktop( struct thread *thread, unsigned int access )
 292 {
 293     return get_desktop_obj( thread->process, thread->desktop, access );
 294 }
 295
 296 /* set the process default desktop handle */
 297 void set_process_default_desktop( struct process *process, struct desktop *desktop,
 298                                   obj_handle_t handle )
 299 {
 300     struct thread *thread;
 301     struct desktop *old_desktop;
 302
 303     if (process->desktop == handle) return;  /* nothing to do */
 304
 305     if (!(old_desktop = get_desktop_obj( process, process->desktop, 0 ))) clear_error();
 306     process->desktop = handle;
 307
 308     /* set desktop for threads that don't have one yet */
 309     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 310         if (!thread->desktop) thread->desktop = handle;
 311
 312     if (!process->is_system)
 313     {
 314         desktop->users++;
 315         if (desktop->close_timeout)
 316         {
 317             remove_timeout_user( desktop->close_timeout );
 318             desktop->close_timeout = NULL;
 319         }
 320         if (old_desktop) old_desktop->users--;
 321     }
 322
 323     if (old_desktop) release_object( old_desktop );
 324 }
 325
 326 /* connect a process to its window station */
 327 void connect_process_winstation( struct process *process, struct thread *parent )
 328 {
 329     struct winstation *winstation = NULL;
 330     struct desktop *desktop = NULL;
 331     obj_handle_t handle;
 332
 333     /* check for an inherited winstation handle (don't ask...) */
 334     if ((handle = find_inherited_handle( process, &winstation_ops )))
 335     {
 336         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 337     }
 338     else if (parent && parent->process->winstation)
 339     {
 340         handle = duplicate_handle( parent->process, parent->process->winstation,
 341                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 342         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 343     }
 344     if (!winstation) goto done;
 345     process->winstation = handle;
 346
 347     if ((handle = find_inherited_handle( process, &desktop_ops )))
 348     {
 349         desktop = get_desktop_obj( process, handle, 0 );
 350         if (!desktop || desktop->winstation != winstation) goto done;
 351     }
 352     else if (parent && parent->desktop)
 353     {
 354         desktop = get_desktop_obj( parent->process, parent->desktop, 0 );
 355         if (!desktop || desktop->winstation != winstation) goto done;
 356         handle = duplicate_handle( parent->process, parent->desktop,
 357                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 358     }
 359
 360     if (handle) set_process_default_desktop( process, desktop, handle );
 361
 362 done:
 363     if (desktop) release_object( desktop );
 364     if (winstation) release_object( winstation );
 365     clear_error();
 366 }
 367
 368 static void close_desktop_timeout( void *private )
 369 {
 370     struct desktop *desktop = private;
 371
 372     desktop->close_timeout = NULL;
 373     unlink_named_object( &desktop->obj );  /* make sure no other process can open it */
 374     close_desktop_window( desktop );  /* and signal the owner to quit */
 375 }
 376
 377 /* close the desktop of a given process */
 378 void close_process_desktop( struct process *process )
 379 {
 380     struct desktop *desktop;
 381
 382     if (process->desktop && (desktop = get_desktop_obj( process, process->desktop, 0 )))
 383     {
 384         assert( desktop->users > 0 );
 385         desktop->users--;
 386         /* if we have one remaining user, it has to be the manager of the desktop window */
 387         if (desktop->users == 1 && get_top_window_owner( desktop ))
 388         {
 389             assert( !desktop->close_timeout );
 390             desktop->close_timeout = add_timeout_user( -TICKS_PER_SEC, close_desktop_timeout, desktop );
 391         }
 392         release_object( desktop );
 393     }
 394     clear_error();  /* ignore errors */
 395 }
 396
 397 /* close the desktop of a given thread */
 398 void close_thread_desktop( struct thread *thread )
 399 {
 400     obj_handle_t handle = thread->desktop;
 401
 402     thread->desktop = 0;
 403     if (handle) close_handle( thread->process, handle );
 404     clear_error();  /* ignore errors */
 405 }
 406
 407 /* set the reply data from the object name */
 408 static void set_reply_data_obj_name( struct object *obj )
 409 {
 410     data_size_t len;
 411     const WCHAR *ptr, *name = get_object_name( obj, &len );
 412
 413     /* if there is a backslash return the part of the name after it */
 414     if (name && (ptr = memchrW( name, '\\', len/sizeof(WCHAR) )))
 415     {
 416         len -= (ptr + 1 - name) * sizeof(WCHAR);
 417         name = ptr + 1;
 418     }
 419     if (name) set_reply_data( name, min( len, get_reply_max_size() ));
 420 }
 421
 422 /* create a window station */
 423 DECL_HANDLER(create_winstation)
 424 {
 425     struct winstation *winstation;
 426     struct unicode_str name;
 427
 428     reply->handle = 0;
 429     get_req_unicode_str( &name );
 430     if ((winstation = create_winstation( &name, req->attributes, req->flags )))
 431     {
 432         reply->handle = alloc_handle( current->process, winstation, req->access, req->attributes );
 433         release_object( winstation );
 434     }
 435 }
 436
 437 /* open a handle to a window station */
 438 DECL_HANDLER(open_winstation)
 439 {
 440     struct unicode_str name;
 441
 442     get_req_unicode_str( &name );
 443     if (winstation_namespace)
 444         reply->handle = open_object( winstation_namespace, &name, &winstation_ops, req->access,
 445                                      req->attributes );
 446     else
 447         set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 448 }
 449
 450
 451 /* close a window station */
 452 DECL_HANDLER(close_winstation)
 453 {
 454     struct winstation *winstation;
 455
 456     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 457                                                            0, &winstation_ops )))
 458     {
 459         if (!close_handle( current->process, req->handle )) set_error( STATUS_ACCESS_DENIED );
 460         release_object( winstation );
 461     }
 462 }
 463
 464
 465 /* get the process current window station */
 466 DECL_HANDLER(get_process_winstation)
 467 {
 468     reply->handle = current->process->winstation;
 469 }
 470
 471
 472 /* set the process current window station */
 473 DECL_HANDLER(set_process_winstation)
 474 {
 475     struct winstation *winstation;
 476
 477     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 478                                                            0, &winstation_ops )))
 479     {
 480         /* FIXME: should we close the old one? */
 481         current->process->winstation = req->handle;
 482         release_object( winstation );
 483     }
 484 }
 485
 486 /* create a desktop */
 487 DECL_HANDLER(create_desktop)
 488 {
 489     struct desktop *desktop;
 490     struct winstation *winstation;
 491     struct unicode_str name;
 492
 493     reply->handle = 0;
 494     get_req_unicode_str( &name );
 495     if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
 496     {
 497         if ((desktop = create_desktop( &name, req->attributes, req->flags, winstation )))
 498         {
 499             reply->handle = alloc_handle( current->process, desktop, req->access, req->attributes );
 500             release_object( desktop );
 501         }
 502         release_object( winstation );
 503     }
 504 }
 505
 506 /* open a handle to a desktop */
 507 DECL_HANDLER(open_desktop)
 508 {
 509     struct winstation *winstation;
 510     struct unicode_str name;
 511
 512     get_req_unicode_str( &name );
 513
 514     /* FIXME: check access rights */
 515     if (!req->winsta)
 516         winstation = get_process_winstation( current->process, 0 );
 517     else
 518         winstation = (struct winstation *)get_handle_obj( current->process, req->winsta, 0, &winstation_ops );
 519
 520     if (winstation)
 521     {
 522         struct unicode_str full_str;
 523         WCHAR *full_name;
 524
 525         if ((full_name = build_desktop_name( &name, winstation, &full_str )))
 526         {
 527             reply->handle = open_object( winstation_namespace, &full_str, &desktop_ops, req->access,
 528                                          req->attributes );
 529             free( full_name );
 530         }
 531         release_object( winstation );
 532     }
 533 }
 534
 535
 536 /* close a desktop */
 537 DECL_HANDLER(close_desktop)
 538 {
 539     struct desktop *desktop;
 540
 541     /* make sure it is a desktop handle */
 542     if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
 543                                                      0, &desktop_ops )))
 544     {
 545         if (!close_handle( current->process, req->handle )) set_error( STATUS_DEVICE_BUSY );
 546         release_object( desktop );
 547     }
 548 }
 549
 550
 551 /* get the thread current desktop */
 552 DECL_HANDLER(get_thread_desktop)
 553 {
 554     struct thread *thread;
 555
 556     if (!(thread = get_thread_from_id( req->tid ))) return;
 557     reply->handle = thread->desktop;
 558     release_object( thread );
 559 }
 560
 561
 562 /* set the thread current desktop */
 563 DECL_HANDLER(set_thread_desktop)
 564 {
 565     struct desktop *old_desktop, *new_desktop;
 566     struct winstation *winstation;
 567
 568     if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 569         return;
 570
 571     if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
 572     {
 573         release_object( winstation );
 574         return;
 575     }
 576     if (new_desktop->winstation != winstation)
 577     {
 578         set_error( STATUS_ACCESS_DENIED );
 579         release_object( new_desktop );
 580         release_object( winstation );
 581         return;
 582     }
 583
 584     /* check if we are changing to a new desktop */
 585
 586     if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
 587         clear_error();  /* ignore error */
 588
 589     /* when changing desktop, we can't have any users on the current one */
 590     if (old_desktop != new_desktop && current->desktop_users > 0)
 591         set_error( STATUS_DEVICE_BUSY );
 592     else
 593         current->desktop = req->handle;  /* FIXME: should we close the old one? */
 594
 595     if (!current->process->desktop)
 596         set_process_default_desktop( current->process, new_desktop, req->handle );
 597
 598     if (old_desktop != new_desktop && current->queue) detach_thread_input( current );
 599
 600     if (old_desktop) release_object( old_desktop );
 601     release_object( new_desktop );
 602     release_object( winstation );
 603 }
 604
 605
 606 /* get/set information about a user object (window station or desktop) */
 607 DECL_HANDLER(set_user_object_info)
 608 {
 609     struct object *obj;
 610
 611     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 612
 613     if (obj->ops == &desktop_ops)
 614     {
 615         struct desktop *desktop = (struct desktop *)obj;
 616         reply->is_desktop = 1;
 617         reply->old_obj_flags = desktop->flags;
 618         if (req->flags & SET_USER_OBJECT_FLAGS) desktop->flags = req->obj_flags;
 619     }
 620     else if (obj->ops == &winstation_ops)
 621     {
 622         struct winstation *winstation = (struct winstation *)obj;
 623         reply->is_desktop = 0;
 624         reply->old_obj_flags = winstation->flags;
 625         if (req->flags & SET_USER_OBJECT_FLAGS) winstation->flags = req->obj_flags;
 626     }
 627     else
 628     {
 629         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 630         release_object( obj );
 631         return;
 632     }
 633     if (get_reply_max_size()) set_reply_data_obj_name( obj );
 634     release_object( obj );
 635 }
 636
 637
 638 /* enumerate window stations */
 639 DECL_HANDLER(enum_winstation)
 640 {
 641     unsigned int index = 0;
 642     struct winstation *winsta;
 643
 644     LIST_FOR_EACH_ENTRY( winsta, &winstation_list, struct winstation, entry )
 645     {
 646         unsigned int access = WINSTA_ENUMERATE;
 647         if (req->index > index++) continue;
 648         if (!check_object_access( &winsta->obj, &access )) continue;
 649         set_reply_data_obj_name( &winsta->obj );
 650         clear_error();
 651         reply->next = index;
 652         return;
 653     }
 654     set_error( STATUS_NO_MORE_ENTRIES );
 655 }
 656
 657
 658 /* enumerate desktops */
 659 DECL_HANDLER(enum_desktop)
 660 {
 661     struct winstation *winstation;
 662     struct desktop *desktop;
 663     unsigned int index = 0;
 664
 665     if (!(winstation = (struct winstation *)get_handle_obj( current->process, req->winstation,
 666                                                             WINSTA_ENUMDESKTOPS, &winstation_ops )))
 667         return;
 668
 669     LIST_FOR_EACH_ENTRY( desktop, &winstation->desktops, struct desktop, entry )
 670     {
 671         unsigned int access = DESKTOP_ENUMERATE;
 672         if (req->index > index++) continue;
 673         if (!desktop->obj.name) continue;
 674         if (!check_object_access( &desktop->obj, &access )) continue;
 675         set_reply_data_obj_name( &desktop->obj );
 676         release_object( winstation );
 677         clear_error();
 678         reply->next = index;
 679         return;
 680     }
 681
 682     release_object( winstation );
 683     set_error( STATUS_NO_MORE_ENTRIES );
 684 }