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 "wine/unicode.h"
  41
  42
  43 static struct list winstation_list = LIST_INIT(winstation_list);
  44 static struct namespace *winstation_namespace;
  45
  46 static void winstation_dump( struct object *obj, int verbose );
  47 static struct object_type *winstation_get_type( struct object *obj );
  48 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  49 static void winstation_destroy( struct object *obj );
  50 static unsigned int winstation_map_access( struct object *obj, unsigned int access );
  51 static void desktop_dump( struct object *obj, int verbose );
  52 static struct object_type *desktop_get_type( struct object *obj );
  53 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
  54 static void desktop_destroy( struct object *obj );
  55 static unsigned int desktop_map_access( struct object *obj, unsigned int access );
  56
  57 static const struct object_ops winstation_ops =
  58 {
  59     sizeof(struct winstation),    /* size */
  60     winstation_dump,              /* dump */
  61     winstation_get_type,          /* get_type */
  62     no_add_queue,                 /* add_queue */
  63     NULL,                         /* remove_queue */
  64     NULL,                         /* signaled */
  65     NULL,                         /* satisfied */
  66     no_signal,                    /* signal */
  67     no_get_fd,                    /* get_fd */
  68     winstation_map_access,        /* map_access */
  69     default_get_sd,               /* get_sd */
  70     default_set_sd,               /* set_sd */
  71     no_lookup_name,               /* lookup_name */
  72     no_open_file,                 /* open_file */
  73     winstation_close_handle,      /* close_handle */
  74     winstation_destroy            /* destroy */
  75 };
  76
  77
  78 static const struct object_ops desktop_ops =
  79 {
  80     sizeof(struct desktop),       /* size */
  81     desktop_dump,                 /* dump */
  82     desktop_get_type,             /* get_type */
  83     no_add_queue,                 /* add_queue */
  84     NULL,                         /* remove_queue */
  85     NULL,                         /* signaled */
  86     NULL,                         /* satisfied */
  87     no_signal,                    /* signal */
  88     no_get_fd,                    /* get_fd */
  89     desktop_map_access,           /* map_access */
  90     default_get_sd,               /* get_sd */
  91     default_set_sd,               /* set_sd */
  92     no_lookup_name,               /* lookup_name */
  93     no_open_file,                 /* open_file */
  94     desktop_close_handle,         /* close_handle */
  95     desktop_destroy               /* destroy */
  96 };
  97
  98 #define DESKTOP_ALL_ACCESS 0x01ff
  99
 100 /* create a winstation object */
 101 static struct winstation *create_winstation( const struct unicode_str *name, unsigned int attr,
 102                                              unsigned int flags )
 103 {
 104     struct winstation *winstation;
 105
 106     if (!winstation_namespace && !(winstation_namespace = create_namespace( 7 )))
 107         return NULL;
 108
 109     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))  /* no backslash allowed in name */
 110     {
 111         set_error( STATUS_INVALID_PARAMETER );
 112         return NULL;
 113     }
 114
 115     if ((winstation = create_named_object( winstation_namespace, &winstation_ops, name, attr )))
 116     {
 117         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 118         {
 119             /* initialize it if it didn't already exist */
 120             winstation->flags = flags;
 121             winstation->clipboard = NULL;
 122             winstation->atom_table = NULL;
 123             list_add_tail( &winstation_list, &winstation->entry );
 124             list_init( &winstation->desktops );
 125         }
 126     }
 127     return winstation;
 128 }
 129
 130 static void winstation_dump( struct object *obj, int verbose )
 131 {
 132     struct winstation *winstation = (struct winstation *)obj;
 133
 134     fprintf( stderr, "Winstation flags=%x clipboard=%p atoms=%p ",
 135              winstation->flags, winstation->clipboard, winstation->atom_table );
 136     dump_object_name( &winstation->obj );
 137     fputc( '\n', stderr );
 138 }
 139
 140 static struct object_type *winstation_get_type( struct object *obj )
 141 {
 142     static const WCHAR name[] = {'W','i','n','d','o','w','S','t','a','t','i','o','n'};
 143     static const struct unicode_str str = { name, sizeof(name) };
 144     return get_object_type( &str );
 145 }
 146
 147 static int winstation_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 148 {
 149     return (process->winstation != handle);
 150 }
 151
 152 static void winstation_destroy( struct object *obj )
 153 {
 154     struct winstation *winstation = (struct winstation *)obj;
 155
 156     list_remove( &winstation->entry );
 157     if (winstation->clipboard) release_object( winstation->clipboard );
 158     if (winstation->atom_table) release_object( winstation->atom_table );
 159 }
 160
 161 static unsigned int winstation_map_access( struct object *obj, unsigned int access )
 162 {
 163     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | WINSTA_ENUMDESKTOPS | WINSTA_READATTRIBUTES |
 164                                             WINSTA_ENUMERATE | WINSTA_READSCREEN;
 165     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | WINSTA_ACCESSCLIPBOARD | WINSTA_CREATEDESKTOP |
 166                                             WINSTA_WRITEATTRIBUTES;
 167     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | WINSTA_ACCESSGLOBALATOMS | WINSTA_EXITWINDOWS;
 168     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_REQUIRED | WINSTA_ALL_ACCESS;
 169     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 170 }
 171
 172 /* retrieve the process window station, checking the handle access rights */
 173 struct winstation *get_process_winstation( struct process *process, unsigned int access )
 174 {
 175     return (struct winstation *)get_handle_obj( process, process->winstation,
 176                                                 access, &winstation_ops );
 177 }
 178
 179 /* build the full name of a desktop object */
 180 static WCHAR *build_desktop_name( const struct unicode_str *name,
 181                                   struct winstation *winstation, struct unicode_str *res )
 182 {
 183     const WCHAR *winstation_name;
 184     WCHAR *full_name;
 185     data_size_t winstation_len;
 186
 187     if (memchrW( name->str, '\\', name->len / sizeof(WCHAR) ))
 188     {
 189         set_error( STATUS_INVALID_PARAMETER );
 190         return NULL;
 191     }
 192
 193     if (!(winstation_name = get_object_name( &winstation->obj, &winstation_len )))
 194         winstation_len = 0;
 195
 196     res->len = winstation_len + name->len + sizeof(WCHAR);
 197     if (!(full_name = mem_alloc( res->len ))) return NULL;
 198     memcpy( full_name, winstation_name, winstation_len );
 199     full_name[winstation_len / sizeof(WCHAR)] = '\\';
 200     memcpy( full_name + winstation_len / sizeof(WCHAR) + 1, name->str, name->len );
 201     res->str = full_name;
 202     return full_name;
 203 }
 204
 205 /* retrieve a pointer to a desktop object */
 206 struct desktop *get_desktop_obj( struct process *process, obj_handle_t handle, unsigned int access )
 207 {
 208     return (struct desktop *)get_handle_obj( process, handle, access, &desktop_ops );
 209 }
 210
 211 /* create a desktop object */
 212 static struct desktop *create_desktop( const struct unicode_str *name, unsigned int attr,
 213                                        unsigned int flags, struct winstation *winstation )
 214 {
 215     struct desktop *desktop;
 216     struct unicode_str full_str;
 217     WCHAR *full_name;
 218
 219     if (!(full_name = build_desktop_name( name, winstation, &full_str ))) return NULL;
 220
 221     if ((desktop = create_named_object( winstation_namespace, &desktop_ops, &full_str, attr )))
 222     {
 223         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 224         {
 225             /* initialize it if it didn't already exist */
 226             desktop->flags = flags;
 227             desktop->winstation = (struct winstation *)grab_object( winstation );
 228             desktop->top_window = NULL;
 229             desktop->global_hooks = NULL;
 230             desktop->close_timeout = NULL;
 231             desktop->users = 0;
 232             list_add_tail( &winstation->desktops, &desktop->entry );
 233         }
 234     }
 235     free( full_name );
 236     return desktop;
 237 }
 238
 239 static void desktop_dump( struct object *obj, int verbose )
 240 {
 241     struct desktop *desktop = (struct desktop *)obj;
 242
 243     fprintf( stderr, "Desktop flags=%x winstation=%p top_win=%p hooks=%p ",
 244              desktop->flags, desktop->winstation, desktop->top_window, desktop->global_hooks );
 245     dump_object_name( &desktop->obj );
 246     fputc( '\n', stderr );
 247 }
 248
 249 static struct object_type *desktop_get_type( struct object *obj )
 250 {
 251     static const WCHAR name[] = {'D','e','s','k','t','o','p'};
 252     static const struct unicode_str str = { name, sizeof(name) };
 253     return get_object_type( &str );
 254 }
 255
 256 static int desktop_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 257 {
 258     struct thread *thread;
 259
 260     /* check if the handle is currently used by the process or one of its threads */
 261     if (process->desktop == handle) return 0;
 262     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 263         if (thread->desktop == handle) return 0;
 264     return 1;
 265 }
 266
 267 static void desktop_destroy( struct object *obj )
 268 {
 269     struct desktop *desktop = (struct desktop *)obj;
 270
 271     if (desktop->top_window) destroy_window( desktop->top_window );
 272     if (desktop->global_hooks) release_object( desktop->global_hooks );
 273     if (desktop->close_timeout) remove_timeout_user( desktop->close_timeout );
 274     list_remove( &desktop->entry );
 275     release_object( desktop->winstation );
 276 }
 277
 278 static unsigned int desktop_map_access( struct object *obj, unsigned int access )
 279 {
 280     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | DESKTOP_READOBJECTS | DESKTOP_ENUMERATE;
 281     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | DESKTOP_CREATEMENU | DESKTOP_CREATEWINDOW |
 282                                             DESKTOP_HOOKCONTROL | DESKTOP_JOURNALRECORD | DESKTOP_JOURNALPLAYBACK |
 283                                             DESKTOP_WRITEOBJECTS;
 284     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | DESKTOP_SWITCHDESKTOP;
 285     if (access & GENERIC_ALL)     access |= STANDARD_RIGHTS_REQUIRED | DESKTOP_ALL_ACCESS;
 286     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 287 }
 288
 289 /* retrieve the thread desktop, checking the handle access rights */
 290 struct desktop *get_thread_desktop( struct thread *thread, unsigned int access )
 291 {
 292     return get_desktop_obj( thread->process, thread->desktop, access );
 293 }
 294
 295 /* set the process default desktop handle */
 296 void set_process_default_desktop( struct process *process, struct desktop *desktop,
 297                                   obj_handle_t handle )
 298 {
 299     struct thread *thread;
 300     struct desktop *old_desktop;
 301
 302     if (process->desktop == handle) return;  /* nothing to do */
 303
 304     if (!(old_desktop = get_desktop_obj( process, process->desktop, 0 ))) clear_error();
 305     process->desktop = handle;
 306
 307     /* set desktop for threads that don't have one yet */
 308     LIST_FOR_EACH_ENTRY( thread, &process->thread_list, struct thread, proc_entry )
 309         if (!thread->desktop) thread->desktop = handle;
 310
 311     desktop->users++;
 312     if (desktop->close_timeout)
 313     {
 314         remove_timeout_user( desktop->close_timeout );
 315         desktop->close_timeout = NULL;
 316     }
 317     if (old_desktop)
 318     {
 319         old_desktop->users--;
 320         release_object( old_desktop );
 321     }
 322 }
 323
 324 /* connect a process to its window station */
 325 void connect_process_winstation( struct process *process, struct thread *parent )
 326 {
 327     struct winstation *winstation = NULL;
 328     struct desktop *desktop = NULL;
 329     obj_handle_t handle;
 330
 331     /* check for an inherited winstation handle (don't ask...) */
 332     if ((handle = find_inherited_handle( process, &winstation_ops )))
 333     {
 334         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 335     }
 336     else if (parent && parent->process->winstation)
 337     {
 338         handle = duplicate_handle( parent->process, parent->process->winstation,
 339                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 340         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 341     }
 342     if (!winstation) goto done;
 343     process->winstation = handle;
 344
 345     if ((handle = find_inherited_handle( process, &desktop_ops )))
 346     {
 347         desktop = get_desktop_obj( process, handle, 0 );
 348         if (!desktop || desktop->winstation != winstation) goto done;
 349     }
 350     else if (parent && parent->desktop)
 351     {
 352         desktop = get_desktop_obj( parent->process, parent->desktop, 0 );
 353         if (!desktop || desktop->winstation != winstation) goto done;
 354         handle = duplicate_handle( parent->process, parent->desktop,
 355                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 356     }
 357
 358     if (handle) set_process_default_desktop( process, desktop, handle );
 359
 360 done:
 361     if (desktop) release_object( desktop );
 362     if (winstation) release_object( winstation );
 363     clear_error();
 364 }
 365
 366 static void close_desktop_timeout( void *private )
 367 {
 368     struct desktop *desktop = private;
 369
 370     desktop->close_timeout = NULL;
 371     unlink_named_object( &desktop->obj );  /* make sure no other process can open it */
 372     close_desktop_window( desktop );  /* and signal the owner to quit */
 373 }
 374
 375 /* close the desktop of a given process */
 376 void close_process_desktop( struct process *process )
 377 {
 378     struct desktop *desktop;
 379
 380     if (process->desktop && (desktop = get_desktop_obj( process, process->desktop, 0 )))
 381     {
 382         assert( desktop->users > 0 );
 383         desktop->users--;
 384         /* if we have one remaining user, it has to be the manager of the desktop window */
 385         if (desktop->users == 1 && get_top_window_owner( desktop ))
 386         {
 387             assert( !desktop->close_timeout );
 388             desktop->close_timeout = add_timeout_user( -TICKS_PER_SEC, close_desktop_timeout, desktop );
 389         }
 390         release_object( desktop );
 391     }
 392     clear_error();  /* ignore errors */
 393 }
 394
 395 /* close the desktop of a given thread */
 396 void close_thread_desktop( struct thread *thread )
 397 {
 398     obj_handle_t handle = thread->desktop;
 399
 400     thread->desktop = 0;
 401     if (handle) close_handle( thread->process, handle );
 402     clear_error();  /* ignore errors */
 403 }
 404
 405 /* set the reply data from the object name */
 406 static void set_reply_data_obj_name( struct object *obj )
 407 {
 408     data_size_t len;
 409     const WCHAR *ptr, *name = get_object_name( obj, &len );
 410
 411     /* if there is a backslash return the part of the name after it */
 412     if (name && (ptr = memchrW( name, '\\', len/sizeof(WCHAR) )))
 413     {
 414         len -= (ptr + 1 - name) * sizeof(WCHAR);
 415         name = ptr + 1;
 416     }
 417     if (name) set_reply_data( name, min( len, get_reply_max_size() ));
 418 }
 419
 420 /* create a window station */
 421 DECL_HANDLER(create_winstation)
 422 {
 423     struct winstation *winstation;
 424     struct unicode_str name;
 425
 426     reply->handle = 0;
 427     get_req_unicode_str( &name );
 428     if ((winstation = create_winstation( &name, req->attributes, req->flags )))
 429     {
 430         reply->handle = alloc_handle( current->process, winstation, req->access, req->attributes );
 431         release_object( winstation );
 432     }
 433 }
 434
 435 /* open a handle to a window station */
 436 DECL_HANDLER(open_winstation)
 437 {
 438     struct unicode_str name;
 439
 440     get_req_unicode_str( &name );
 441     if (winstation_namespace)
 442         reply->handle = open_object( winstation_namespace, &name, &winstation_ops, req->access,
 443                                      req->attributes );
 444     else
 445         set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 446 }
 447
 448
 449 /* close a window station */
 450 DECL_HANDLER(close_winstation)
 451 {
 452     struct winstation *winstation;
 453
 454     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 455                                                            0, &winstation_ops )))
 456     {
 457         if (!close_handle( current->process, req->handle )) set_error( STATUS_ACCESS_DENIED );
 458         release_object( winstation );
 459     }
 460 }
 461
 462
 463 /* get the process current window station */
 464 DECL_HANDLER(get_process_winstation)
 465 {
 466     reply->handle = current->process->winstation;
 467 }
 468
 469
 470 /* set the process current window station */
 471 DECL_HANDLER(set_process_winstation)
 472 {
 473     struct winstation *winstation;
 474
 475     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 476                                                            0, &winstation_ops )))
 477     {
 478         /* FIXME: should we close the old one? */
 479         current->process->winstation = req->handle;
 480         release_object( winstation );
 481     }
 482 }
 483
 484 /* create a desktop */
 485 DECL_HANDLER(create_desktop)
 486 {
 487     struct desktop *desktop;
 488     struct winstation *winstation;
 489     struct unicode_str name;
 490
 491     reply->handle = 0;
 492     get_req_unicode_str( &name );
 493     if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
 494     {
 495         if ((desktop = create_desktop( &name, req->attributes, req->flags, winstation )))
 496         {
 497             reply->handle = alloc_handle( current->process, desktop, req->access, req->attributes );
 498             release_object( desktop );
 499         }
 500         release_object( winstation );
 501     }
 502 }
 503
 504 /* open a handle to a desktop */
 505 DECL_HANDLER(open_desktop)
 506 {
 507     struct winstation *winstation;
 508     struct unicode_str name;
 509
 510     get_req_unicode_str( &name );
 511
 512     /* FIXME: check access rights */
 513     if (!req->winsta)
 514         winstation = get_process_winstation( current->process, 0 );
 515     else
 516         winstation = (struct winstation *)get_handle_obj( current->process, req->winsta, 0, &winstation_ops );
 517
 518     if (winstation)
 519     {
 520         struct unicode_str full_str;
 521         WCHAR *full_name;
 522
 523         if ((full_name = build_desktop_name( &name, winstation, &full_str )))
 524         {
 525             reply->handle = open_object( winstation_namespace, &full_str, &desktop_ops, req->access,
 526                                          req->attributes );
 527             free( full_name );
 528         }
 529         release_object( winstation );
 530     }
 531 }
 532
 533
 534 /* close a desktop */
 535 DECL_HANDLER(close_desktop)
 536 {
 537     struct desktop *desktop;
 538
 539     /* make sure it is a desktop handle */
 540     if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
 541                                                      0, &desktop_ops )))
 542     {
 543         if (!close_handle( current->process, req->handle )) set_error( STATUS_DEVICE_BUSY );
 544         release_object( desktop );
 545     }
 546 }
 547
 548
 549 /* get the thread current desktop */
 550 DECL_HANDLER(get_thread_desktop)
 551 {
 552     struct thread *thread;
 553
 554     if (!(thread = get_thread_from_id( req->tid ))) return;
 555     reply->handle = thread->desktop;
 556     release_object( thread );
 557 }
 558
 559
 560 /* set the thread current desktop */
 561 DECL_HANDLER(set_thread_desktop)
 562 {
 563     struct desktop *old_desktop, *new_desktop;
 564     struct winstation *winstation;
 565
 566     if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 567         return;
 568
 569     if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
 570     {
 571         release_object( winstation );
 572         return;
 573     }
 574     if (new_desktop->winstation != winstation)
 575     {
 576         set_error( STATUS_ACCESS_DENIED );
 577         release_object( new_desktop );
 578         release_object( winstation );
 579         return;
 580     }
 581
 582     /* check if we are changing to a new desktop */
 583
 584     if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
 585         clear_error();  /* ignore error */
 586
 587     /* when changing desktop, we can't have any users on the current one */
 588     if (old_desktop != new_desktop && current->desktop_users > 0)
 589         set_error( STATUS_DEVICE_BUSY );
 590     else
 591         current->desktop = req->handle;  /* FIXME: should we close the old one? */
 592
 593     if (!current->process->desktop)
 594         set_process_default_desktop( current->process, new_desktop, req->handle );
 595
 596     if (old_desktop != new_desktop && current->queue) detach_thread_input( current );
 597
 598     if (old_desktop) release_object( old_desktop );
 599     release_object( new_desktop );
 600     release_object( winstation );
 601 }
 602
 603
 604 /* get/set information about a user object (window station or desktop) */
 605 DECL_HANDLER(set_user_object_info)
 606 {
 607     struct object *obj;
 608
 609     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 610
 611     if (obj->ops == &desktop_ops)
 612     {
 613         struct desktop *desktop = (struct desktop *)obj;
 614         reply->is_desktop = 1;
 615         reply->old_obj_flags = desktop->flags;
 616         if (req->flags & SET_USER_OBJECT_FLAGS) desktop->flags = req->obj_flags;
 617     }
 618     else if (obj->ops == &winstation_ops)
 619     {
 620         struct winstation *winstation = (struct winstation *)obj;
 621         reply->is_desktop = 0;
 622         reply->old_obj_flags = winstation->flags;
 623         if (req->flags & SET_USER_OBJECT_FLAGS) winstation->flags = req->obj_flags;
 624     }
 625     else
 626     {
 627         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 628         release_object( obj );
 629         return;
 630     }
 631     if (get_reply_max_size()) set_reply_data_obj_name( obj );
 632     release_object( obj );
 633 }
 634
 635
 636 /* enumerate window stations */
 637 DECL_HANDLER(enum_winstation)
 638 {
 639     unsigned int index = req->index;
 640     obj_handle_t handle;
 641     struct object *obj;
 642
 643     while ((handle = enumerate_handles( current->process, &winstation_ops, &index )))
 644     {
 645         if (!(obj = get_handle_obj( current->process, handle, WINSTA_ENUMERATE, &winstation_ops )))
 646             continue;
 647         set_reply_data_obj_name( obj );
 648         release_object( obj );
 649         clear_error();
 650         reply->next = index;
 651         return;
 652     }
 653     set_error( STATUS_NO_MORE_ENTRIES );
 654 }
 655
 656
 657 /* enumerate desktops */
 658 DECL_HANDLER(enum_desktop)
 659 {
 660     struct winstation *winstation;
 661     struct desktop *desktop;
 662     unsigned int index = req->index;
 663     obj_handle_t handle;
 664
 665     if (!(winstation = (struct winstation *)get_handle_obj( current->process, req->winstation,
 666                                                             WINSTA_ENUMDESKTOPS, &winstation_ops )))
 667         return;
 668
 669     while ((handle = enumerate_handles( current->process, &desktop_ops, &index )))
 670     {
 671         if (!(desktop = get_desktop_obj( current->process, handle, DESKTOP_ENUMERATE )))
 672             continue;
 673
 674         if (desktop->winstation == winstation)
 675         {
 676             set_reply_data_obj_name( &desktop->obj );
 677             release_object( desktop );
 678             release_object( winstation );
 679             clear_error();
 680             reply->next = index;
 681             return;
 682         }
 683         release_object( desktop );
 684     }
 685
 686     release_object( winstation );
 687     set_error( STATUS_NO_MORE_ENTRIES );
 688 }