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;
 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         need_more_memory = FALSE;
 189
 190         SERVER_START_REQ( get_security_object )
 191         {
 192             req->handle = Object;
 193             req->security_info = RequestedInformation;
 194             wine_server_set_reply( req, buffer, buffer_size );
 195             status = wine_server_call( req );
 196             if (status == STATUS_SUCCESS)
 197             {
 198                 struct security_descriptor *sd = (struct security_descriptor *)buffer;
 199                 if (reply->sd_len)
 200                 {
 201                     *ResultLength = sizeof(SECURITY_DESCRIPTOR_RELATIVE) +
 202                         sd->owner_len + sd->group_len + sd->sacl_len + sd->dacl_len;
 203                     if (Length >= *ResultLength)
 204                     {
 205                         psd->Revision = SECURITY_DESCRIPTOR_REVISION;
 206                         psd->Sbz1 = 0;
 207                         psd->Control = sd->control | SE_SELF_RELATIVE;
 208                         psd->Owner = sd->owner_len ? sizeof(SECURITY_DESCRIPTOR_RELATIVE) : 0;
 209                         psd->Group = sd->group_len ? sizeof(SECURITY_DESCRIPTOR_RELATIVE) + sd->owner_len : 0;
 210                         psd->Sacl = sd->sacl_len ? sizeof(SECURITY_DESCRIPTOR_RELATIVE) + sd->owner_len + sd->group_len : 0;
 211                         psd->Dacl = sd->dacl_len ? sizeof(SECURITY_DESCRIPTOR_RELATIVE) + sd->owner_len + sd->group_len + sd->sacl_len : 0;
 212                         /* owner, group, sacl and dacl are the same type as in the server
 213                          * and in the same order so we copy the memory in one block */
 214                         memcpy((char *)pSecurityDescriptor + sizeof(SECURITY_DESCRIPTOR_RELATIVE),
 215                                buffer + sizeof(struct security_descriptor),
 216                                sd->owner_len + sd->group_len + sd->sacl_len + sd->dacl_len);
 217                     }
 218                     else
 219                         status = STATUS_BUFFER_TOO_SMALL;
 220                 }
 221                 else
 222                 {
 223                     *ResultLength = sizeof(SECURITY_DESCRIPTOR_RELATIVE);
 224                     if (Length >= *ResultLength)
 225                     {
 226                         memset(psd, 0, sizeof(*psd));
 227                         psd->Revision = SECURITY_DESCRIPTOR_REVISION;
 228                         psd->Control = SE_SELF_RELATIVE;
 229                     }
 230                     else
 231                         status = STATUS_BUFFER_TOO_SMALL;
 232                 }
 233             }
 234             else if (status == STATUS_BUFFER_TOO_SMALL)
 235             {
 236                 buffer_size = reply->sd_len;
 237                 need_more_memory = TRUE;
 238             }
 239         }
 240         SERVER_END_REQ;
 241         RtlFreeHeap(GetProcessHeap(), 0, buffer);
 242     } while (need_more_memory);
 243
 244     return status;
 245 }
 246
 247
 248 /******************************************************************************
 249  *  NtDuplicateObject           [NTDLL.@]
 250  *  ZwDuplicateObject           [NTDLL.@]
 251  */
 252 NTSTATUS WINAPI NtDuplicateObject( HANDLE source_process, HANDLE source,
 253                                    HANDLE dest_process, PHANDLE dest,
 254                                    ACCESS_MASK access, ULONG attributes, ULONG options )
 255 {
 256     NTSTATUS ret;
 257     SERVER_START_REQ( dup_handle )
 258     {
 259         req->src_process = source_process;
 260         req->src_handle  = source;
 261         req->dst_process = dest_process;
 262         req->access      = access;
 263         req->attributes  = attributes;
 264         req->options     = options;
 265
 266         if (!(ret = wine_server_call( req )))
 267         {
 268             if (dest) *dest = reply->handle;
 269             if (reply->closed)
 270             {
 271                 if (reply->self)
 272                 {
 273                     int fd = server_remove_fd_from_cache( source );
 274                     if (fd != -1) close( fd );
 275                 }
 276             }
 277             else if (options & DUPLICATE_CLOSE_SOURCE)
 278                 WARN( "failed to close handle %p in process %p\n", source, source_process );
 279         }
 280     }
 281     SERVER_END_REQ;
 282     return ret;
 283 }
 284
 285 /**************************************************************************
 286  *                 NtClose                              [NTDLL.@]
 287  *
 288  * Close a handle reference to an object.
 289  *
 290  * PARAMS
 291  *  Handle [I] handle to close
 292  *
 293  * RETURNS
 294  *  Success: ERROR_SUCCESS.
 295  *  Failure: An NTSTATUS error code.
 296  */
 297 NTSTATUS WINAPI NtClose( HANDLE Handle )
 298 {
 299     NTSTATUS ret;
 300     int fd = server_remove_fd_from_cache( Handle );
 301
 302     SERVER_START_REQ( close_handle )
 303     {
 304         req->handle = Handle;
 305         ret = wine_server_call( req );
 306     }
 307     SERVER_END_REQ;
 308     if (fd != -1) close( fd );
 309     return ret;
 310 }
 311
 312 /*
 313  *      Directory functions
 314  */
 315
 316 /**************************************************************************
 317  * NtOpenDirectoryObject [NTDLL.@]
 318  * ZwOpenDirectoryObject [NTDLL.@]
 319  *
 320  * Open a namespace directory object.
 321  *
 322  * PARAMS
 323  *  DirectoryHandle  [O] Destination for the new directory handle
 324  *  DesiredAccess    [I] Desired access to the directory
 325  *  ObjectAttributes [I] Structure describing the directory
 326  *
 327  * RETURNS
 328  *  Success: ERROR_SUCCESS.
 329  *  Failure: An NTSTATUS error code.
 330  */
 331 NTSTATUS WINAPI NtOpenDirectoryObject(PHANDLE DirectoryHandle, ACCESS_MASK DesiredAccess,
 332                                       POBJECT_ATTRIBUTES ObjectAttributes)
 333 {
 334     NTSTATUS ret;
 335     TRACE("(%p,0x%08x)\n", DirectoryHandle, DesiredAccess);
 336     dump_ObjectAttributes(ObjectAttributes);
 337
 338     if (!DirectoryHandle) return STATUS_ACCESS_VIOLATION;
 339     if (!ObjectAttributes) return STATUS_INVALID_PARAMETER;
 340     /* Have to test it here because server won't know difference between
 341      * ObjectName == NULL and ObjectName == "" */
 342     if (!ObjectAttributes->ObjectName)
 343     {
 344         if (ObjectAttributes->RootDirectory)
 345             return STATUS_OBJECT_NAME_INVALID;
 346         else
 347             return STATUS_OBJECT_PATH_SYNTAX_BAD;
 348     }
 349
 350     SERVER_START_REQ(open_directory)
 351     {
 352         req->access = DesiredAccess;
 353         req->attributes = ObjectAttributes->Attributes;
 354         req->rootdir = ObjectAttributes->RootDirectory;
 355         if (ObjectAttributes->ObjectName)
 356             wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
 357                                  ObjectAttributes->ObjectName->Length);
 358         ret = wine_server_call( req );
 359         *DirectoryHandle = reply->handle;
 360     }
 361     SERVER_END_REQ;
 362     return ret;
 363 }
 364
 365 /******************************************************************************
 366  *  NtCreateDirectoryObject     [NTDLL.@]
 367  *  ZwCreateDirectoryObject     [NTDLL.@]
 368  *
 369  * Create a namespace directory object.
 370  *
 371  * PARAMS
 372  *  DirectoryHandle  [O] Destination for the new directory handle
 373  *  DesiredAccess    [I] Desired access to the directory
 374  *  ObjectAttributes [I] Structure describing the directory
 375  *
 376  * RETURNS
 377  *  Success: ERROR_SUCCESS.
 378  *  Failure: An NTSTATUS error code.
 379  */
 380 NTSTATUS WINAPI NtCreateDirectoryObject(PHANDLE DirectoryHandle, ACCESS_MASK DesiredAccess,
 381                                         POBJECT_ATTRIBUTES ObjectAttributes)
 382 {
 383     NTSTATUS ret;
 384     TRACE("(%p,0x%08x)\n", DirectoryHandle, DesiredAccess);
 385     dump_ObjectAttributes(ObjectAttributes);
 386
 387     if (!DirectoryHandle) return STATUS_ACCESS_VIOLATION;
 388
 389     SERVER_START_REQ(create_directory)
 390     {
 391         req->access = DesiredAccess;
 392         req->attributes = ObjectAttributes ? ObjectAttributes->Attributes : 0;
 393         req->rootdir = ObjectAttributes ? ObjectAttributes->RootDirectory : 0;
 394         if (ObjectAttributes && ObjectAttributes->ObjectName)
 395             wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
 396                                  ObjectAttributes->ObjectName->Length);
 397         ret = wine_server_call( req );
 398         *DirectoryHandle = reply->handle;
 399     }
 400     SERVER_END_REQ;
 401     return ret;
 402 }
 403
 404 /******************************************************************************
 405  * NtQueryDirectoryObject [NTDLL.@]
 406  * ZwQueryDirectoryObject [NTDLL.@]
 407  *
 408  * Read information from a namespace directory.
 409  *
 410  * PARAMS
 411  *  handle        [I]   Handle to a directory object
 412  *  buffer        [O]   Buffer to hold the read data
 413  *  size          [I]   Size of the buffer in bytes
 414  *  single_entry  [I]   If TRUE, return a single entry, if FALSE, return as many as fit in the buffer
 415  *  restart       [I]   If TRUE, start scanning from the start, if FALSE, scan from Context
 416  *  context       [I/O] Indicates what point of the directory the scan is at
 417  *  ret_size      [O]   Caller supplied storage for the number of bytes written (or NULL)
 418  *
 419  * RETURNS
 420  *  Success: ERROR_SUCCESS.
 421  *  Failure: An NTSTATUS error code.
 422  */
 423 NTSTATUS WINAPI NtQueryDirectoryObject(HANDLE handle, PDIRECTORY_BASIC_INFORMATION buffer,
 424                                        ULONG size, BOOLEAN single_entry, BOOLEAN restart,
 425                                        PULONG context, PULONG ret_size)
 426 {
 427     NTSTATUS ret;
 428
 429     if (restart) *context = 0;
 430
 431     if (single_entry)
 432     {
 433         if (size <= sizeof(*buffer) + 2*sizeof(WCHAR)) return STATUS_BUFFER_OVERFLOW;
 434
 435         SERVER_START_REQ( get_directory_entry )
 436         {
 437             req->handle = handle;
 438             req->index = *context;
 439             wine_server_set_reply( req, buffer + 1, size - sizeof(*buffer) - 2*sizeof(WCHAR) );
 440             if (!(ret = wine_server_call( req )))
 441             {
 442                 buffer->ObjectName.Buffer = (WCHAR *)(buffer + 1);
 443                 buffer->ObjectName.Length = reply->name_len;
 444                 buffer->ObjectName.MaximumLength = reply->name_len + sizeof(WCHAR);
 445                 buffer->ObjectTypeName.Buffer = (WCHAR *)(buffer + 1) + reply->name_len/sizeof(WCHAR) + 1;
 446                 buffer->ObjectTypeName.Length = wine_server_reply_size( reply ) - reply->name_len;
 447                 buffer->ObjectTypeName.MaximumLength = buffer->ObjectTypeName.Length + sizeof(WCHAR);
 448                 /* make room for the terminating null */
 449                 memmove( buffer->ObjectTypeName.Buffer, buffer->ObjectTypeName.Buffer - 1,
 450                          buffer->ObjectTypeName.Length );
 451                 buffer->ObjectName.Buffer[buffer->ObjectName.Length/sizeof(WCHAR)] = 0;
 452                 buffer->ObjectTypeName.Buffer[buffer->ObjectTypeName.Length/sizeof(WCHAR)] = 0;
 453                 (*context)++;
 454             }
 455         }
 456         SERVER_END_REQ;
 457         if (ret_size)
 458             *ret_size = buffer->ObjectName.MaximumLength + buffer->ObjectTypeName.MaximumLength + sizeof(*buffer);
 459     }
 460     else
 461     {
 462         FIXME("multiple entries not implemented\n");
 463         ret = STATUS_NOT_IMPLEMENTED;
 464     }
 465
 466     return ret;
 467 }
 468
 469 /*
 470  *      Link objects
 471  */
 472
 473 /******************************************************************************
 474  *  NtOpenSymbolicLinkObject    [NTDLL.@]
 475  *  ZwOpenSymbolicLinkObject    [NTDLL.@]
 476  *
 477  * Open a namespace symbolic link object.
 478  *
 479  * PARAMS
 480  *  LinkHandle       [O] Destination for the new symbolic link handle
 481  *  DesiredAccess    [I] Desired access to the symbolic link
 482  *  ObjectAttributes [I] Structure describing the symbolic link
 483  *
 484  * RETURNS
 485  *  Success: ERROR_SUCCESS.
 486  *  Failure: An NTSTATUS error code.
 487  */
 488 NTSTATUS WINAPI NtOpenSymbolicLinkObject(OUT PHANDLE LinkHandle, IN ACCESS_MASK DesiredAccess,
 489                                          IN POBJECT_ATTRIBUTES ObjectAttributes)
 490 {
 491     NTSTATUS ret;
 492     TRACE("(%p,0x%08x,%p)\n",LinkHandle, DesiredAccess, ObjectAttributes);
 493     dump_ObjectAttributes(ObjectAttributes);
 494
 495     if (!LinkHandle) return STATUS_ACCESS_VIOLATION;
 496     if (!ObjectAttributes) return STATUS_INVALID_PARAMETER;
 497     /* Have to test it here because server won't know difference between
 498      * ObjectName == NULL and ObjectName == "" */
 499     if (!ObjectAttributes->ObjectName)
 500     {
 501         if (ObjectAttributes->RootDirectory)
 502             return STATUS_OBJECT_NAME_INVALID;
 503         else
 504             return STATUS_OBJECT_PATH_SYNTAX_BAD;
 505     }
 506
 507     SERVER_START_REQ(open_symlink)
 508     {
 509         req->access = DesiredAccess;
 510         req->attributes = ObjectAttributes->Attributes;
 511         req->rootdir = ObjectAttributes->RootDirectory;
 512         if (ObjectAttributes->ObjectName)
 513             wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
 514                                  ObjectAttributes->ObjectName->Length);
 515         ret = wine_server_call( req );
 516         *LinkHandle = reply->handle;
 517     }
 518     SERVER_END_REQ;
 519     return ret;
 520 }
 521
 522 /******************************************************************************
 523  *  NtCreateSymbolicLinkObject  [NTDLL.@]
 524  *  ZwCreateSymbolicLinkObject  [NTDLL.@]
 525  *
 526  * Open a namespace symbolic link object.
 527  *
 528  * PARAMS
 529  *  SymbolicLinkHandle [O] Destination for the new symbolic link handle
 530  *  DesiredAccess      [I] Desired access to the symbolic link
 531  *  ObjectAttributes   [I] Structure describing the symbolic link
 532  *  TargetName         [I] Name of the target symbolic link points to
 533  *
 534  * RETURNS
 535  *  Success: ERROR_SUCCESS.
 536  *  Failure: An NTSTATUS error code.
 537  */
 538 NTSTATUS WINAPI NtCreateSymbolicLinkObject(OUT PHANDLE SymbolicLinkHandle,IN ACCESS_MASK DesiredAccess,
 539                                            IN POBJECT_ATTRIBUTES ObjectAttributes,
 540                                            IN PUNICODE_STRING TargetName)
 541 {
 542     NTSTATUS ret;
 543     TRACE("(%p,0x%08x,%p, -> %s)\n", SymbolicLinkHandle, DesiredAccess, ObjectAttributes,
 544                                       debugstr_us(TargetName));
 545     dump_ObjectAttributes(ObjectAttributes);
 546
 547     if (!SymbolicLinkHandle || !TargetName) return STATUS_ACCESS_VIOLATION;
 548     if (!TargetName->Buffer) return STATUS_INVALID_PARAMETER;
 549
 550     SERVER_START_REQ(create_symlink)
 551     {
 552         req->access = DesiredAccess;
 553         req->attributes = ObjectAttributes ? ObjectAttributes->Attributes : 0;
 554         req->rootdir = ObjectAttributes ? ObjectAttributes->RootDirectory : 0;
 555         if (ObjectAttributes && ObjectAttributes->ObjectName)
 556         {
 557             req->name_len = ObjectAttributes->ObjectName->Length;
 558             wine_server_add_data(req, ObjectAttributes->ObjectName->Buffer,
 559                                  ObjectAttributes->ObjectName->Length);
 560         }
 561         else
 562             req->name_len = 0;
 563         wine_server_add_data(req, TargetName->Buffer, TargetName->Length);
 564         ret = wine_server_call( req );
 565         *SymbolicLinkHandle = reply->handle;
 566     }
 567     SERVER_END_REQ;
 568     return ret;
 569 }
 570
 571 /******************************************************************************
 572  *  NtQuerySymbolicLinkObject   [NTDLL.@]
 573  *  ZwQuerySymbolicLinkObject   [NTDLL.@]
 574  *
 575  * Query a namespace symbolic link object target name.
 576  *
 577  * PARAMS
 578  *  LinkHandle     [I] Handle to a symbolic link object
 579  *  LinkTarget     [O] Destination for the symbolic link target
 580  *  ReturnedLength [O] Size of returned data
 581  *
 582  * RETURNS
 583  *  Success: ERROR_SUCCESS.
 584  *  Failure: An NTSTATUS error code.
 585  */
 586 NTSTATUS WINAPI NtQuerySymbolicLinkObject(IN HANDLE LinkHandle, IN OUT PUNICODE_STRING LinkTarget,
 587                                           OUT PULONG ReturnedLength OPTIONAL)
 588 {
 589     NTSTATUS ret;
 590     TRACE("(%p,%p,%p)\n", LinkHandle, LinkTarget, ReturnedLength);
 591
 592     if (!LinkTarget) return STATUS_ACCESS_VIOLATION;
 593
 594     SERVER_START_REQ(query_symlink)
 595     {
 596         req->handle = LinkHandle;
 597         wine_server_set_reply( req, LinkTarget->Buffer, LinkTarget->MaximumLength );
 598         if (!(ret = wine_server_call( req )))
 599         {
 600             LinkTarget->Length = wine_server_reply_size(reply);
 601             if (ReturnedLength) *ReturnedLength = LinkTarget->Length;
 602         }
 603     }
 604     SERVER_END_REQ;
 605     return ret;
 606 }
 607
 608 /******************************************************************************
 609  *  NtAllocateUuids   [NTDLL.@]
 610  */
 611 NTSTATUS WINAPI NtAllocateUuids(
 612         PULARGE_INTEGER Time,
 613         PULONG Range,
 614         PULONG Sequence)
 615 {
 616         FIXME("(%p,%p,%p), stub.\n", Time, Range, Sequence);
 617         return 0;
 618 }