dlls/ntdll/om.c

   1 /*
   2  *      Object management functions
   3  *
   4  * Copyright 1999, 2000 Juergen Schmied
   5  * Copyright 2005 Vitaliy Margolen
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "config.h"
  23
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #ifdef HAVE_IO_H
  28 # include <io.h>
  29 #endif
  30 #ifdef HAVE_UNISTD_H
  31 # include <unistd.h>
  32 #endif
  33
  34 #include "ntstatus.h"
  35 #define WIN32_NO_STATUS
  36 #include "wine/debug.h"
  37 #include "windef.h"
  38 #include "winternl.h"
  39 #include "ntdll_misc.h"
  40 #include "wine/server.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
  43
  44
  45 /*
  46  *      Generic object functions
  47  */
  48
  49 /******************************************************************************
  50  * NtQueryObject [NTDLL.@]
  51  * ZwQueryObject [NTDLL.@]
  52  */
  53 NTSTATUS WINAPI NtQueryObject(IN HANDLE handle,
  54                               IN OBJECT_INFORMATION_CLASS info_class,
  55                               OUT PVOID ptr, IN ULONG len, OUT PULONG used_len)
  56 {
  57     NTSTATUS status;
  58
  59     TRACE("(%p,0x%08x,%p,0x%08x,%p): stub\n",
  60           handle, info_class, ptr, len, used_len);
  61
  62     if (used_len) *used_len = 0;
  63
  64     switch (info_class)
  65     {
  66     case ObjectBasicInformation:
  67         {
  68             POBJECT_BASIC_INFORMATION p = (POBJECT_BASIC_INFORMATION)ptr;
  69
  70             if (len < sizeof(*p)) return STATUS_INVALID_BUFFER_SIZE;
  71
  72             SERVER_START_REQ( get_object_info )
  73             {
  74                 req->handle = handle;
  75                 status = wine_server_call( req );
  76                 if (status == STATUS_SUCCESS)
  77                 {
  78                     memset( p, 0, sizeof(*p) );
  79                     p->GrantedAccess = reply->access;
  80                     p->PointerCount = reply->ref_count;
  81                     p->HandleCount = 1; /* at least one */
  82                     if (used_len) *used_len = sizeof(*p);
  83                 }
  84             }
  85             SERVER_END_REQ;
  86         }
  87         break;
  88     case ObjectDataInformation:
  89         {
  90             OBJECT_DATA_INFORMATION* p = (OBJECT_DATA_INFORMATION*)ptr;
  91
  92             if (len < sizeof(*p)) return STATUS_INVALID_BUFFER_SIZE;
  93
  94             SERVER_START_REQ( set_handle_info )
  95             {
  96                 req->handle = handle;
  97                 req->flags  = 0;
  98                 req->mask   = 0;
  99                 status = wine_server_call( req );
 100                 if (status == STATUS_SUCCESS)
 101                 {
 102                     p->InheritHandle = (reply->old_flags & HANDLE_FLAG_INHERIT) ? TRUE : FALSE;
 103                     p->ProtectFromClose = (reply->old_flags & HANDLE_FLAG_PROTECT_FROM_CLOSE) ? TRUE : FALSE;
 104                     if (used_len) *used_len = sizeof(*p);
 105                 }
 106             }
 107             SERVER_END_REQ;
 108         }
 109         break;
 110     default:
 111         FIXME("Unsupported information class %u\n", info_class);
 112         status = STATUS_NOT_IMPLEMENTED;
 113         break;
 114     }
 115     return status;
 116 }
 117
 118 /******************************************************************
 119  *              NtSetInformationObject [NTDLL.@]
 120  *              ZwSetInformationObject [NTDLL.@]
 121  *
 122  */
 123 NTSTATUS WINAPI NtSetInformationObject(IN HANDLE handle,
 124                                        IN OBJECT_INFORMATION_CLASS info_class,
 125                                        IN PVOID ptr, IN ULONG len)
 126 {
 127     NTSTATUS status;
 128
 129     TRACE("(%p,0x%08x,%p,0x%08x): stub\n",
 130           handle, info_class, ptr, len);
 131
 132     switch (info_class)
 133     {
 134     case ObjectDataInformation:
 135         {
 136             OBJECT_DATA_INFORMATION* p = (OBJECT_DATA_INFORMATION*)ptr;
 137
 138             if (len < sizeof(*p)) return STATUS_INVALID_BUFFER_SIZE;
 139
 140             SERVER_START_REQ( set_handle_info )
 141             {
 142                 req->handle = handle;
 143                 req->flags  = 0;
 144                 req->mask   = HANDLE_FLAG_INHERIT | HANDLE_FLAG_PROTECT_FROM_CLOSE;
 145                 if (p->InheritHandle)    req->flags |= HANDLE_FLAG_INHERIT;
 146                 if (p->ProtectFromClose) req->flags |= HANDLE_FLAG_PROTECT_FROM_CLOSE;
 147                 status = wine_server_call( req );
 148             }
 149             SERVER_END_REQ;
 150         }
 151         break;
 152     default:
 153         FIXME("Unsupported information class %u\n", info_class);
 154         status = STATUS_NOT_IMPLEMENTED;
 155         break;
 156     }
 157     return status;
 158 }
 159
 160 /******************************************************************************
 161  *  NtQuerySecurityObject       [NTDLL.@]
 162  *
 163  * An ntdll analogue to GetKernelObjectSecurity().
 164  *
 165  */
 166 NTSTATUS WINAPI
 167 NtQuerySecurityObject(
 168         IN HANDLE Object,
 169         IN SECURITY_INFORMATION RequestedInformation,
 170         OUT PSECURITY_DESCRIPTOR pSecurityDescriptor,
 171         IN ULONG Length,
 172         OUT PULONG ResultLength)
 173 {
 174     PISECURITY_DESCRIPTOR_RELATIVE psd = pSecurityDescriptor;
 175     NTSTATUS status;
 176     unsigned int buffer_size = 512;
 177     BOOLEAN need_more_memory = FALSE;
 178
 179     TRACE("(%p,0x%08x,%p,0x%08x,%p)\n",
 180         Object, RequestedInformation, pSecurityDescriptor, Length, ResultLength);
 181
 182     do
 183     {
 184         char *buffer = RtlAllocateHeap(GetProcessHeap(), 0, buffer_size);
 185         if (!buffer)
 186             return STATUS_NO_MEMORY;
 187
 188         SERVER_START_REQ( get_security_object )
 189         {
 190             req->handle = Object;
 191             req->security_info = RequestedInformation;
 192             wine_server_set_reply( req, buffer, buffer_size );
 193             status = wine_server_call( req );
 194             if (status == STATUS_SUCCESS)
 195             {
 196                 struct security_descriptor *sd = (struct security_descriptor *)buffer;
 197                 if (reply->sd_len)
 198                 {
 199                     *ResultLength = sizeof(SECURITY_DESCRIPTOR_RELATIVE) +
 200                         sd->owner_len + sd->group_len + sd->sacl_len + sd->dacl_len;
 201                     if (Length >= *ResultLength)
 202                     {
 203                         psd->Revision = SECURITY_DESCRIPTOR_REVISION;
 204                         psd->Sbz1 = 0;
 205                         psd->Control = sd->control | SE_SELF_RELATIVE;
 206                         psd->Owner = sd->owner_len ? sizeof(SECURITY_DESCRIPTOR_RELATIVE) : 0;
 207                         psd->Group = sd->group_len ? sizeof(SECURITY_DESCRIPTOR_RELATIVE) + sd->owner_len : 0;
 208                         psd->Sacl = sd->sacl_len ? sizeof(SECURITY_DESCRIPTOR_RELATIVE) + sd->owner_len + sd->group_len : 0;
 209                         psd->Dacl = sd->dacl_len ? sizeof(SECURITY_DESCRIPTOR_RELATIVE) + sd->owner_len + sd->group_len + sd->sacl_len : 0;
 210                         /* owner, group, sacl and dacl are the same type as in the server
 211                          * and in the same order so we copy the memory in one block */
 212                         memcpy((char *)pSecurityDescriptor + sizeof(SECURITY_DESCRIPTOR_RELATIVE),
 213                                buffer + sizeof(struct security_descriptor),
 214                                sd->owner_len + sd->group_len + sd->sacl_len + sd->dacl_len);
 215                     }
 216                     else
 217                         status = STATUS_BUFFER_TOO_SMALL;
 218                 }
 219                 else
 220                 {
 221                     *ResultLength = sizeof(SECURITY_DESCRIPTOR_RELATIVE);
 222                     if (Length >= *ResultLength)
 223                     {
 224                         memset(psd, 0, sizeof(*psd));
 225                         psd->Revision = SECURITY_DESCRIPTOR_REVISION;
 226                         psd->Control = SE_SELF_RELATIVE;
 227                     }
 228                     else
 229                         status = STATUS_BUFFER_TOO_SMALL;
 230                 }
 231             }
 232             else if (status == STATUS_BUFFER_TOO_SMALL)
 233             {
 234                 buffer_size = reply->sd_len;
 235                 need_more_memory = TRUE;
 236             }
 237         }
 238         SERVER_END_REQ;
 239         RtlFreeHeap(GetProcessHeap(), 0, buffer);
 240     } while (need_more_memory);
 241
 242     return status;
 243 }
 244
 245
 246 /******************************************************************************
 247  *  NtDuplicateObject           [NTDLL.@]
 248  *  ZwDuplicateObject           [NTDLL.@]
 249  */
 250 NTSTATUS WINAPI NtDuplicateObject( HANDLE source_process, HANDLE source,
 251                                    HANDLE dest_process, PHANDLE dest,
 252                                    ACCESS_MASK access, ULONG attributes, ULONG options )
 253 {
 254     NTSTATUS ret;
 255     SERVER_START_REQ( dup_handle )
 256     {
 257         req->src_process = source_process;
 258         req->src_handle  = source;
 259         req->dst_process = dest_process;
 260         req->access      = access;
 261         req->attributes  = attributes;
 262         req->options     = options;
 263
 264         if (!(ret = wine_server_call( req )))
 265         {
 266             if (dest) *dest = reply->handle;
 267             if (reply->closed)
 268             {
 269                 if (reply->self)
 270                 {
 271                     int fd = server_remove_fd_from_cache( source );
 272                     if (fd != -1) close( fd );
 273                 }
 274             }
 275             else if (options & DUPLICATE_CLOSE_SOURCE)
 276                 WARN( "failed to close handle %p in process %p\n", source, source_process );
 277         }
 278     }
 279     SERVER_END_REQ;
 280     return ret;
 281 }
 282
 283 /**************************************************************************
 284  *                 NtClose                              [NTDLL.@]
 285  *
 286  * Close a handle reference to an object.
 287  *
 288  * PARAMS
 289  *  Handle [I] handle to close
 290  *
 291  * RETURNS
 292  *  Success: ERROR_SUCCESS.
 293  *  Failure: An NTSTATUS error code.
 294  */
 295 NTSTATUS WINAPI NtClose( HANDLE Handle )
 296 {
 297     NTSTATUS ret;
 298     int fd = server_remove_fd_from_cache( Handle );
 299
 300     SERVER_START_REQ( close_handle )
 301     {
 302         req->handle = Handle;
 303         ret = wine_server_call( req );
 304     }
 305     SERVER_END_REQ;
 306     if (fd != -1) close( fd );
 307     return ret;
 308 }
 309
 310 /*
 311  *      Directory functions
 312  */
 313
 314 /**************************************************************************
 315  * NtOpenDirectoryObject [NTDLL.@]
 316  * ZwOpenDirectoryObject [NTDLL.@]
 317  *
 318  * Open a namespace directory object.
 319  *
 320  * PARAMS
 321  *  DirectoryHandle  [O] Destination for the new directory handle
 322  *  DesiredAccess    [I] Desired access to the directory
 323  *  ObjectAttributes [I] Structure describing the directory
 324  *
 325  * RETURNS
 326  *  Success: ERROR_SUCCESS.
 327  *  Failure: An NTSTATUS error code.
 328  */
 329 NTSTATUS WINAPI NtOpenDirectoryObject(PHANDLE DirectoryHandle, ACCESS_MASK DesiredAccess,
 330                                       POBJECT_ATTRIBUTES ObjectAttributes)
 331 {
 332     NTSTATUS ret;
 333     TRACE("(%p,0x%08x)\n", DirectoryHandle, DesiredAccess);
 334     dump_ObjectAttributes(ObjectAttributes);
 335
 336     if (!DirectoryHandle) return STATUS_ACCESS_VIOLATION;
 337     if (!ObjectAttributes) return STATUS_INVALID_PARAMETER;
 338     /* Have to test it here because server won't know difference between
 339      * ObjectName == NULL and ObjectName == "" */
 340     if (!ObjectAttributes->ObjectName)
 341     {
 342         if (ObjectAttributes->RootDirectory)
 343             return STATUS_OBJECT_NAME_INVALID;
 344         else
 345             return STATUS_OBJECT_PATH_SYNTAX_BAD;
 346     }
 347
 348     SERVER_START_REQ(open_directory)
 349     {
 350         req->access = DesiredAccess;
 351         req->attributes = ObjectAttributes->Attributes;
 352         req->rootdir = ObjectAttributes->RootDirectory;
 353         if (ObjectAttributes->ObjectName)
 354             wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
 355                                  ObjectAttributes->ObjectName->Length);
 356         ret = wine_server_call( req );
 357         *DirectoryHandle = reply->handle;
 358     }
 359     SERVER_END_REQ;
 360     return ret;
 361 }
 362
 363 /******************************************************************************
 364  *  NtCreateDirectoryObject     [NTDLL.@]
 365  *  ZwCreateDirectoryObject     [NTDLL.@]
 366  *
 367  * Create a namespace directory object.
 368  *
 369  * PARAMS
 370  *  DirectoryHandle  [O] Destination for the new directory handle
 371  *  DesiredAccess    [I] Desired access to the directory
 372  *  ObjectAttributes [I] Structure describing the directory
 373  *
 374  * RETURNS
 375  *  Success: ERROR_SUCCESS.
 376  *  Failure: An NTSTATUS error code.
 377  */
 378 NTSTATUS WINAPI NtCreateDirectoryObject(PHANDLE DirectoryHandle, ACCESS_MASK DesiredAccess,
 379                                         POBJECT_ATTRIBUTES ObjectAttributes)
 380 {
 381     NTSTATUS ret;
 382     TRACE("(%p,0x%08x)\n", DirectoryHandle, DesiredAccess);
 383     dump_ObjectAttributes(ObjectAttributes);
 384
 385     if (!DirectoryHandle) return STATUS_ACCESS_VIOLATION;
 386
 387     SERVER_START_REQ(create_directory)
 388     {
 389         req->access = DesiredAccess;
 390         req->attributes = ObjectAttributes ? ObjectAttributes->Attributes : 0;
 391         req->rootdir = ObjectAttributes ? ObjectAttributes->RootDirectory : 0;
 392         if (ObjectAttributes && ObjectAttributes->ObjectName)
 393             wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
 394                                  ObjectAttributes->ObjectName->Length);
 395         ret = wine_server_call( req );
 396         *DirectoryHandle = reply->handle;
 397     }
 398     SERVER_END_REQ;
 399     return ret;
 400 }
 401
 402 /******************************************************************************
 403  * NtQueryDirectoryObject [NTDLL.@]
 404  * ZwQueryDirectoryObject [NTDLL.@]
 405  *
 406  * Read information from a namespace directory.
 407  *
 408  * PARAMS
 409  *  handle        [I]   Handle to a directory object
 410  *  buffer        [O]   Buffer to hold the read data
 411  *  size          [I]   Size of the buffer in bytes
 412  *  single_entry  [I]   If TRUE, return a single entry, if FALSE, return as many as fit in the buffer
 413  *  restart       [I]   If TRUE, start scanning from the start, if FALSE, scan from Context
 414  *  context       [I/O] Indicates what point of the directory the scan is at
 415  *  ret_size      [O]   Caller supplied storage for the number of bytes written (or NULL)
 416  *
 417  * RETURNS
 418  *  Success: ERROR_SUCCESS.
 419  *  Failure: An NTSTATUS error code.
 420  */
 421 NTSTATUS WINAPI NtQueryDirectoryObject(HANDLE handle, PDIRECTORY_BASIC_INFORMATION buffer,
 422                                        ULONG size, BOOLEAN single_entry, BOOLEAN restart,
 423                                        PULONG context, PULONG ret_size)
 424 {
 425     NTSTATUS ret;
 426
 427     if (restart) *context = 0;
 428
 429     if (single_entry)
 430     {
 431         if (size <= sizeof(*buffer) + 2*sizeof(WCHAR)) return STATUS_BUFFER_OVERFLOW;
 432
 433         SERVER_START_REQ( get_directory_entry )
 434         {
 435             req->handle = handle;
 436             req->index = *context;
 437             wine_server_set_reply( req, buffer + 1, size - sizeof(*buffer) - 2*sizeof(WCHAR) );
 438             if (!(ret = wine_server_call( req )))
 439             {
 440                 buffer->ObjectName.Buffer = (WCHAR *)(buffer + 1);
 441                 buffer->ObjectName.Length = reply->name_len;
 442                 buffer->ObjectName.MaximumLength = reply->name_len + sizeof(WCHAR);
 443                 buffer->ObjectTypeName.Buffer = (WCHAR *)(buffer + 1) + reply->name_len/sizeof(WCHAR) + 1;
 444                 buffer->ObjectTypeName.Length = wine_server_reply_size( reply ) - reply->name_len;
 445                 buffer->ObjectTypeName.MaximumLength = buffer->ObjectTypeName.Length + sizeof(WCHAR);
 446                 /* make room for the terminating null */
 447                 memmove( buffer->ObjectTypeName.Buffer, buffer->ObjectTypeName.Buffer - 1,
 448                          buffer->ObjectTypeName.Length );
 449                 buffer->ObjectName.Buffer[buffer->ObjectName.Length/sizeof(WCHAR)] = 0;
 450                 buffer->ObjectTypeName.Buffer[buffer->ObjectTypeName.Length/sizeof(WCHAR)] = 0;
 451                 (*context)++;
 452             }
 453         }
 454         SERVER_END_REQ;
 455         if (ret_size)
 456             *ret_size = buffer->ObjectName.MaximumLength + buffer->ObjectTypeName.MaximumLength + sizeof(*buffer);
 457     }
 458     else
 459     {
 460         FIXME("multiple entries not implemented\n");
 461         ret = STATUS_NOT_IMPLEMENTED;
 462     }
 463
 464     return ret;
 465 }
 466
 467 /*
 468  *      Link objects
 469  */
 470
 471 /******************************************************************************
 472  *  NtOpenSymbolicLinkObject    [NTDLL.@]
 473  *  ZwOpenSymbolicLinkObject    [NTDLL.@]
 474  *
 475  * Open a namespace symbolic link object.
 476  *
 477  * PARAMS
 478  *  LinkHandle       [O] Destination for the new symbolic link handle
 479  *  DesiredAccess    [I] Desired access to the symbolic link
 480  *  ObjectAttributes [I] Structure describing the symbolic link
 481  *
 482  * RETURNS
 483  *  Success: ERROR_SUCCESS.
 484  *  Failure: An NTSTATUS error code.
 485  */
 486 NTSTATUS WINAPI NtOpenSymbolicLinkObject(OUT PHANDLE LinkHandle, IN ACCESS_MASK DesiredAccess,
 487                                          IN POBJECT_ATTRIBUTES ObjectAttributes)
 488 {
 489     NTSTATUS ret;
 490     TRACE("(%p,0x%08x,%p)\n",LinkHandle, DesiredAccess, ObjectAttributes);
 491     dump_ObjectAttributes(ObjectAttributes);
 492
 493     if (!LinkHandle) return STATUS_ACCESS_VIOLATION;
 494     if (!ObjectAttributes) return STATUS_INVALID_PARAMETER;
 495     /* Have to test it here because server won't know difference between
 496      * ObjectName == NULL and ObjectName == "" */
 497     if (!ObjectAttributes->ObjectName)
 498     {
 499         if (ObjectAttributes->RootDirectory)
 500             return STATUS_OBJECT_NAME_INVALID;
 501         else
 502             return STATUS_OBJECT_PATH_SYNTAX_BAD;
 503     }
 504
 505     SERVER_START_REQ(open_symlink)
 506     {
 507         req->access = DesiredAccess;
 508         req->attributes = ObjectAttributes->Attributes;
 509         req->rootdir = ObjectAttributes->RootDirectory;
 510         if (ObjectAttributes->ObjectName)
 511             wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
 512                                  ObjectAttributes->ObjectName->Length);
 513         ret = wine_server_call( req );
 514         *LinkHandle = reply->handle;
 515     }
 516     SERVER_END_REQ;
 517     return ret;
 518 }
 519
 520 /******************************************************************************
 521  *  NtCreateSymbolicLinkObject  [NTDLL.@]
 522  *  ZwCreateSymbolicLinkObject  [NTDLL.@]
 523  *
 524  * Open a namespace symbolic link object.
 525  *
 526  * PARAMS
 527  *  SymbolicLinkHandle [O] Destination for the new symbolic link handle
 528  *  DesiredAccess      [I] Desired access to the symbolic link
 529  *  ObjectAttributes   [I] Structure describing the symbolic link
 530  *  TargetName         [I] Name of the target symbolic link points to
 531  *
 532  * RETURNS
 533  *  Success: ERROR_SUCCESS.
 534  *  Failure: An NTSTATUS error code.
 535  */
 536 NTSTATUS WINAPI NtCreateSymbolicLinkObject(OUT PHANDLE SymbolicLinkHandle,IN ACCESS_MASK DesiredAccess,
 537                                            IN POBJECT_ATTRIBUTES ObjectAttributes,
 538                                            IN PUNICODE_STRING TargetName)
 539 {
 540     NTSTATUS ret;
 541     TRACE("(%p,0x%08x,%p, -> %s)\n", SymbolicLinkHandle, DesiredAccess, ObjectAttributes,
 542                                       debugstr_us(TargetName));
 543     dump_ObjectAttributes(ObjectAttributes);
 544
 545     if (!SymbolicLinkHandle || !TargetName) return STATUS_ACCESS_VIOLATION;
 546     if (!TargetName->Buffer) return STATUS_INVALID_PARAMETER;
 547
 548     SERVER_START_REQ(create_symlink)
 549     {
 550         req->access = DesiredAccess;
 551         req->attributes = ObjectAttributes ? ObjectAttributes->Attributes : 0;
 552         req->rootdir = ObjectAttributes ? ObjectAttributes->RootDirectory : 0;
 553         if (ObjectAttributes && ObjectAttributes->ObjectName)
 554         {
 555             req->name_len = ObjectAttributes->ObjectName->Length;
 556             wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
 557                                  ObjectAttributes->ObjectName->Length);
 558         }
 559         else
 560             req->name_len = 0;
 561         wine_server_add_data(req, TargetName->Buffer, TargetName->Length);
 562         ret = wine_server_call( req );
 563         *SymbolicLinkHandle = reply->handle;
 564     }
 565     SERVER_END_REQ;
 566     return ret;
 567 }
 568
 569 /******************************************************************************
 570  *  NtQuerySymbolicLinkObject   [NTDLL.@]
 571  *  ZwQuerySymbolicLinkObject   [NTDLL.@]
 572  *
 573  * Query a namespace symbolic link object target name.
 574  *
 575  * PARAMS
 576  *  LinkHandle     [I] Handle to a symbolic link object
 577  *  LinkTarget     [O] Destination for the symbolic link target
 578  *  ReturnedLength [O] Size of returned data
 579  *
 580  * RETURNS
 581  *  Success: ERROR_SUCCESS.
 582  *  Failure: An NTSTATUS error code.
 583  */
 584 NTSTATUS WINAPI NtQuerySymbolicLinkObject(IN HANDLE LinkHandle, IN OUT PUNICODE_STRING LinkTarget,
 585                                           OUT PULONG ReturnedLength OPTIONAL)
 586 {
 587     NTSTATUS ret;
 588     TRACE("(%p,%p,%p)\n", LinkHandle, LinkTarget, ReturnedLength);
 589
 590     if (!LinkTarget) return STATUS_ACCESS_VIOLATION;
 591
 592     SERVER_START_REQ(query_symlink)
 593     {
 594         req->handle = LinkHandle;
 595         wine_server_set_reply( req, LinkTarget->Buffer, LinkTarget->MaximumLength );
 596         if (!(ret = wine_server_call( req )))
 597         {
 598             LinkTarget->Length = wine_server_reply_size(reply);
 599             if (ReturnedLength) *ReturnedLength = LinkTarget->Length;
 600         }
 601     }
 602     SERVER_END_REQ;
 603     return ret;
 604 }
 605
 606 /******************************************************************************
 607  *  NtAllocateUuids   [NTDLL.@]
 608  */
 609 NTSTATUS WINAPI NtAllocateUuids(
 610         PULARGE_INTEGER Time,
 611         PULONG Range,
 612         PULONG Sequence)
 613 {
 614         FIXME("(%p,%p,%p), stub.\n", Time, Range, Sequence);
 615         return 0;
 616 }