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 static inline struct desktop *get_desktop_obj( struct process *process, obj_handle_t handle,
 207                                                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     desktop->users++;
 313     if (desktop->close_timeout)
 314     {
 315         remove_timeout_user( desktop->close_timeout );
 316         desktop->close_timeout = NULL;
 317     }
 318     if (old_desktop)
 319     {
 320         old_desktop->users--;
 321         release_object( old_desktop );
 322     }
 323 }
 324
 325 /* connect a process to its window station */
 326 void connect_process_winstation( struct process *process, struct thread *parent )
 327 {
 328     struct winstation *winstation = NULL;
 329     struct desktop *desktop = NULL;
 330     obj_handle_t handle;
 331
 332     /* check for an inherited winstation handle (don't ask...) */
 333     if ((handle = find_inherited_handle( process, &winstation_ops )))
 334     {
 335         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 336     }
 337     else if (parent && parent->process->winstation)
 338     {
 339         handle = duplicate_handle( parent->process, parent->process->winstation,
 340                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 341         winstation = (struct winstation *)get_handle_obj( process, handle, 0, &winstation_ops );
 342     }
 343     if (!winstation) goto done;
 344     process->winstation = handle;
 345
 346     if ((handle = find_inherited_handle( process, &desktop_ops )))
 347     {
 348         desktop = get_desktop_obj( process, handle, 0 );
 349         if (!desktop || desktop->winstation != winstation) goto done;
 350     }
 351     else if (parent && parent->desktop)
 352     {
 353         desktop = get_desktop_obj( parent->process, parent->desktop, 0 );
 354         if (!desktop || desktop->winstation != winstation) goto done;
 355         handle = duplicate_handle( parent->process, parent->desktop,
 356                                    process, 0, 0, DUP_HANDLE_SAME_ACCESS );
 357     }
 358
 359     if (handle) set_process_default_desktop( process, desktop, handle );
 360
 361 done:
 362     if (desktop) release_object( desktop );
 363     if (winstation) release_object( winstation );
 364     clear_error();
 365 }
 366
 367 static void close_desktop_timeout( void *private )
 368 {
 369     struct desktop *desktop = private;
 370
 371     desktop->close_timeout = NULL;
 372     unlink_named_object( &desktop->obj );  /* make sure no other process can open it */
 373     close_desktop_window( desktop );  /* and signal the owner to quit */
 374 }
 375
 376 /* close the desktop of a given process */
 377 void close_process_desktop( struct process *process )
 378 {
 379     struct desktop *desktop;
 380
 381     if (process->desktop && (desktop = get_desktop_obj( process, process->desktop, 0 )))
 382     {
 383         assert( desktop->users > 0 );
 384         desktop->users--;
 385         /* if we have one remaining user, it has to be the manager of the desktop window */
 386         if (desktop->users == 1 && get_top_window_owner( desktop ))
 387         {
 388             assert( !desktop->close_timeout );
 389             desktop->close_timeout = add_timeout_user( -TICKS_PER_SEC, close_desktop_timeout, desktop );
 390         }
 391         release_object( desktop );
 392     }
 393     clear_error();  /* ignore errors */
 394 }
 395
 396 /* close the desktop of a given thread */
 397 void close_thread_desktop( struct thread *thread )
 398 {
 399     obj_handle_t handle = thread->desktop;
 400
 401     thread->desktop = 0;
 402     if (handle) close_handle( thread->process, handle );
 403     clear_error();  /* ignore errors */
 404 }
 405
 406 /* set the reply data from the object name */
 407 static void set_reply_data_obj_name( struct object *obj )
 408 {
 409     data_size_t len;
 410     const WCHAR *ptr, *name = get_object_name( obj, &len );
 411
 412     /* if there is a backslash return the part of the name after it */
 413     if (name && (ptr = memchrW( name, '\\', len/sizeof(WCHAR) )))
 414     {
 415         len -= (ptr + 1 - name) * sizeof(WCHAR);
 416         name = ptr + 1;
 417     }
 418     if (name) set_reply_data( name, min( len, get_reply_max_size() ));
 419 }
 420
 421 /* create a window station */
 422 DECL_HANDLER(create_winstation)
 423 {
 424     struct winstation *winstation;
 425     struct unicode_str name;
 426
 427     reply->handle = 0;
 428     get_req_unicode_str( &name );
 429     if ((winstation = create_winstation( &name, req->attributes, req->flags )))
 430     {
 431         reply->handle = alloc_handle( current->process, winstation, req->access, req->attributes );
 432         release_object( winstation );
 433     }
 434 }
 435
 436 /* open a handle to a window station */
 437 DECL_HANDLER(open_winstation)
 438 {
 439     struct unicode_str name;
 440
 441     get_req_unicode_str( &name );
 442     if (winstation_namespace)
 443         reply->handle = open_object( winstation_namespace, &name, &winstation_ops, req->access,
 444                                      req->attributes );
 445     else
 446         set_error( STATUS_OBJECT_NAME_NOT_FOUND );
 447 }
 448
 449
 450 /* close a window station */
 451 DECL_HANDLER(close_winstation)
 452 {
 453     struct winstation *winstation;
 454
 455     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 456                                                            0, &winstation_ops )))
 457     {
 458         if (!close_handle( current->process, req->handle )) set_error( STATUS_ACCESS_DENIED );
 459         release_object( winstation );
 460     }
 461 }
 462
 463
 464 /* get the process current window station */
 465 DECL_HANDLER(get_process_winstation)
 466 {
 467     reply->handle = current->process->winstation;
 468 }
 469
 470
 471 /* set the process current window station */
 472 DECL_HANDLER(set_process_winstation)
 473 {
 474     struct winstation *winstation;
 475
 476     if ((winstation = (struct winstation *)get_handle_obj( current->process, req->handle,
 477                                                            0, &winstation_ops )))
 478     {
 479         /* FIXME: should we close the old one? */
 480         current->process->winstation = req->handle;
 481         release_object( winstation );
 482     }
 483 }
 484
 485 /* create a desktop */
 486 DECL_HANDLER(create_desktop)
 487 {
 488     struct desktop *desktop;
 489     struct winstation *winstation;
 490     struct unicode_str name;
 491
 492     reply->handle = 0;
 493     get_req_unicode_str( &name );
 494     if ((winstation = get_process_winstation( current->process, WINSTA_CREATEDESKTOP )))
 495     {
 496         if ((desktop = create_desktop( &name, req->attributes, req->flags, winstation )))
 497         {
 498             reply->handle = alloc_handle( current->process, desktop, req->access, req->attributes );
 499             release_object( desktop );
 500         }
 501         release_object( winstation );
 502     }
 503 }
 504
 505 /* open a handle to a desktop */
 506 DECL_HANDLER(open_desktop)
 507 {
 508     struct winstation *winstation;
 509     struct unicode_str name;
 510
 511     get_req_unicode_str( &name );
 512     if ((winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 513     {
 514         struct unicode_str full_str;
 515         WCHAR *full_name;
 516
 517         if ((full_name = build_desktop_name( &name, winstation, &full_str )))
 518         {
 519             reply->handle = open_object( winstation_namespace, &full_str, &desktop_ops, req->access,
 520                                          req->attributes );
 521             free( full_name );
 522         }
 523         release_object( winstation );
 524     }
 525 }
 526
 527
 528 /* close a desktop */
 529 DECL_HANDLER(close_desktop)
 530 {
 531     struct desktop *desktop;
 532
 533     /* make sure it is a desktop handle */
 534     if ((desktop = (struct desktop *)get_handle_obj( current->process, req->handle,
 535                                                      0, &desktop_ops )))
 536     {
 537         if (!close_handle( current->process, req->handle )) set_error( STATUS_DEVICE_BUSY );
 538         release_object( desktop );
 539     }
 540 }
 541
 542
 543 /* get the thread current desktop */
 544 DECL_HANDLER(get_thread_desktop)
 545 {
 546     struct thread *thread;
 547
 548     if (!(thread = get_thread_from_id( req->tid ))) return;
 549     reply->handle = thread->desktop;
 550     release_object( thread );
 551 }
 552
 553
 554 /* set the thread current desktop */
 555 DECL_HANDLER(set_thread_desktop)
 556 {
 557     struct desktop *old_desktop, *new_desktop;
 558     struct winstation *winstation;
 559
 560     if (!(winstation = get_process_winstation( current->process, 0 /* FIXME: access rights? */ )))
 561         return;
 562
 563     if (!(new_desktop = get_desktop_obj( current->process, req->handle, 0 )))
 564     {
 565         release_object( winstation );
 566         return;
 567     }
 568     if (new_desktop->winstation != winstation)
 569     {
 570         set_error( STATUS_ACCESS_DENIED );
 571         release_object( new_desktop );
 572         release_object( winstation );
 573         return;
 574     }
 575
 576     /* check if we are changing to a new desktop */
 577
 578     if (!(old_desktop = get_desktop_obj( current->process, current->desktop, 0)))
 579         clear_error();  /* ignore error */
 580
 581     /* when changing desktop, we can't have any users on the current one */
 582     if (old_desktop != new_desktop && current->desktop_users > 0)
 583         set_error( STATUS_DEVICE_BUSY );
 584     else
 585         current->desktop = req->handle;  /* FIXME: should we close the old one? */
 586
 587     if (!current->process->desktop)
 588         set_process_default_desktop( current->process, new_desktop, req->handle );
 589
 590     if (old_desktop != new_desktop && current->queue) detach_thread_input( current );
 591
 592     if (old_desktop) release_object( old_desktop );
 593     release_object( new_desktop );
 594     release_object( winstation );
 595 }
 596
 597
 598 /* get/set information about a user object (window station or desktop) */
 599 DECL_HANDLER(set_user_object_info)
 600 {
 601     struct object *obj;
 602
 603     if (!(obj = get_handle_obj( current->process, req->handle, 0, NULL ))) return;
 604
 605     if (obj->ops == &desktop_ops)
 606     {
 607         struct desktop *desktop = (struct desktop *)obj;
 608         reply->is_desktop = 1;
 609         reply->old_obj_flags = desktop->flags;
 610         if (req->flags & SET_USER_OBJECT_FLAGS) desktop->flags = req->obj_flags;
 611     }
 612     else if (obj->ops == &winstation_ops)
 613     {
 614         struct winstation *winstation = (struct winstation *)obj;
 615         reply->is_desktop = 0;
 616         reply->old_obj_flags = winstation->flags;
 617         if (req->flags & SET_USER_OBJECT_FLAGS) winstation->flags = req->obj_flags;
 618     }
 619     else
 620     {
 621         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 622         release_object( obj );
 623         return;
 624     }
 625     if (get_reply_max_size()) set_reply_data_obj_name( obj );
 626     release_object( obj );
 627 }
 628
 629
 630 /* enumerate window stations */
 631 DECL_HANDLER(enum_winstation)
 632 {
 633     unsigned int index = req->index;
 634     obj_handle_t handle;
 635     struct object *obj;
 636
 637     while ((handle = enumerate_handles( current->process, &winstation_ops, &index )))
 638     {
 639         if (!(obj = get_handle_obj( current->process, handle, WINSTA_ENUMERATE, &winstation_ops )))
 640             continue;
 641         set_reply_data_obj_name( obj );
 642         release_object( obj );
 643         clear_error();
 644         reply->next = index;
 645         return;
 646     }
 647     set_error( STATUS_NO_MORE_ENTRIES );
 648 }
 649
 650
 651 /* enumerate desktops */
 652 DECL_HANDLER(enum_desktop)
 653 {
 654     struct winstation *winstation;
 655     struct desktop *desktop;
 656     unsigned int index = req->index;
 657     obj_handle_t handle;
 658
 659     if (!(winstation = (struct winstation *)get_handle_obj( current->process, req->winstation,
 660                                                             WINSTA_ENUMDESKTOPS, &winstation_ops )))
 661         return;
 662
 663     while ((handle = enumerate_handles( current->process, &desktop_ops, &index )))
 664     {
 665         if (!(desktop = get_desktop_obj( current->process, handle, DESKTOP_ENUMERATE )))
 666             continue;
 667
 668         if (desktop->winstation == winstation)
 669         {
 670             set_reply_data_obj_name( &desktop->obj );
 671             release_object( desktop );
 672             clear_error();
 673             reply->next = index;
 674             return;
 675         }
 676         release_object( desktop );
 677     }
 678
 679     release_object( winstation );
 680     set_error( STATUS_NO_MORE_ENTRIES );
 681 }