dlls/kernel32/virtual.c

   1 /*
   2  * Win32 virtual memory functions
   3  *
   4  * Copyright 1997 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 <fcntl.h>
  25 #include <stdarg.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32
  33 #define NONAMELESSUNION
  34 #define NONAMELESSSTRUCT
  35 #include "ntstatus.h"
  36 #define WIN32_NO_STATUS
  37 #include "windef.h"
  38 #include "winbase.h"
  39 #include "winnls.h"
  40 #include "winternl.h"
  41 #include "winerror.h"
  42 #include "psapi.h"
  43 #include "wine/exception.h"
  44 #include "wine/debug.h"
  45
  46 #include "kernel_private.h"
  47
  48 WINE_DECLARE_DEBUG_CHANNEL(seh);
  49 WINE_DECLARE_DEBUG_CHANNEL(file);
  50
  51 static unsigned int page_size;
  52
  53
  54 /***********************************************************************
  55  *             VirtualAlloc   (KERNEL32.@)
  56  *
  57  * Reserves or commits a region of pages in virtual address space.
  58  *
  59  * PARAMS
  60  *  addr    [I] Address of region to reserve or commit.
  61  *  size    [I] Size of region.
  62  *  type    [I] Type of allocation.
  63  *  protect [I] Type of access protection.
  64  *
  65  * RETURNS
  66  *      Success: Base address of allocated region of pages.
  67  *      Failure: NULL.
  68  */
  69 LPVOID WINAPI VirtualAlloc( LPVOID addr, SIZE_T size, DWORD type, DWORD protect )
  70 {
  71     return VirtualAllocEx( GetCurrentProcess(), addr, size, type, protect );
  72 }
  73
  74
  75 /***********************************************************************
  76  *             VirtualAllocEx   (KERNEL32.@)
  77  *
  78  * Seems to be just as VirtualAlloc, but with process handle.
  79  *
  80  * PARAMS
  81  *  hProcess [I] Handle to process to do mem operation.
  82  *  addr     [I] Address of region to reserve or commit.
  83  *  size     [I] Size of region.
  84  *  type     [I] Type of allocation.
  85  *  protect  [I] Type of access protection.
  86  *
  87  *
  88  * RETURNS
  89  *      Success: Base address of allocated region of pages.
  90  *      Failure: NULL.
  91  */
  92 LPVOID WINAPI VirtualAllocEx( HANDLE hProcess, LPVOID addr, SIZE_T size,
  93     DWORD type, DWORD protect )
  94 {
  95     LPVOID ret = addr;
  96     NTSTATUS status;
  97
  98     if ((status = NtAllocateVirtualMemory( hProcess, &ret, 0, &size, type, protect )))
  99     {
 100         SetLastError( RtlNtStatusToDosError(status) );
 101         ret = NULL;
 102     }
 103     return ret;
 104 }
 105
 106
 107 /***********************************************************************
 108  *             VirtualFree   (KERNEL32.@)
 109  *
 110  * Releases or decommits a region of pages in virtual address space.
 111  *
 112  * PARAMS
 113  *  addr [I] Address of region of committed pages.
 114  *  size [I] Size of region.
 115  *  type [I] Type of operation.
 116  *
 117  * RETURNS
 118  *      Success: TRUE.
 119  *      Failure: FALSE.
 120  */
 121 BOOL WINAPI VirtualFree( LPVOID addr, SIZE_T size, DWORD type )
 122 {
 123     return VirtualFreeEx( GetCurrentProcess(), addr, size, type );
 124 }
 125
 126
 127 /***********************************************************************
 128  *             VirtualFreeEx   (KERNEL32.@)
 129  *
 130  * Releases or decommits a region of pages in virtual address space.
 131  *
 132  * PARAMS
 133  *  process [I] Handle to process.
 134  *  addr    [I] Address of region to free.
 135  *  size    [I] Size of region.
 136  *  type    [I] Type of operation.
 137  *
 138  * RETURNS
 139  *      Success: TRUE.
 140  *      Failure: FALSE.
 141  */
 142 BOOL WINAPI VirtualFreeEx( HANDLE process, LPVOID addr, SIZE_T size, DWORD type )
 143 {
 144     NTSTATUS status = NtFreeVirtualMemory( process, &addr, &size, type );
 145     if (status) SetLastError( RtlNtStatusToDosError(status) );
 146     return !status;
 147 }
 148
 149
 150 /***********************************************************************
 151  *             VirtualLock   (KERNEL32.@)
 152  *
 153  * Locks the specified region of virtual address space.
 154  *
 155  * PARAMS
 156  *  addr [I] Address of first byte of range to lock.
 157  *  size [I] Number of bytes in range to lock.
 158  *
 159  * RETURNS
 160  *      Success: TRUE.
 161  *      Failure: FALSE.
 162  *
 163  * NOTES
 164  *      Always returns TRUE.
 165  *
 166  */
 167 BOOL WINAPI VirtualLock( LPVOID addr, SIZE_T size )
 168 {
 169     NTSTATUS status = NtLockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
 170     if (status) SetLastError( RtlNtStatusToDosError(status) );
 171     return !status;
 172 }
 173
 174
 175 /***********************************************************************
 176  *             VirtualUnlock   (KERNEL32.@)
 177  *
 178  * Unlocks a range of pages in the virtual address space.
 179  *
 180  * PARAMS
 181  *  addr [I] Address of first byte of range.
 182  *  size [I] Number of bytes in range.
 183  *
 184  * RETURNS
 185  *      Success: TRUE.
 186  *      Failure: FALSE.
 187  *
 188  * NOTES
 189  *      Always returns TRUE.
 190  *
 191  */
 192 BOOL WINAPI VirtualUnlock( LPVOID addr, SIZE_T size )
 193 {
 194     NTSTATUS status = NtUnlockVirtualMemory( GetCurrentProcess(), &addr, &size, 1 );
 195     if (status) SetLastError( RtlNtStatusToDosError(status) );
 196     return !status;
 197 }
 198
 199
 200 /***********************************************************************
 201  *             VirtualProtect   (KERNEL32.@)
 202  *
 203  * Changes the access protection on a region of committed pages.
 204  *
 205  * PARAMS
 206  *  addr     [I] Address of region of committed pages.
 207  *  size     [I] Size of region.
 208  *  new_prot [I] Desired access protection.
 209  *  old_prot [O] Address of variable to get old protection.
 210  *
 211  * RETURNS
 212  *      Success: TRUE.
 213  *      Failure: FALSE.
 214  */
 215 BOOL WINAPI VirtualProtect( LPVOID addr, SIZE_T size, DWORD new_prot, LPDWORD old_prot)
 216 {
 217     return VirtualProtectEx( GetCurrentProcess(), addr, size, new_prot, old_prot );
 218 }
 219
 220
 221 /***********************************************************************
 222  *             VirtualProtectEx   (KERNEL32.@)
 223  *
 224  * Changes the access protection on a region of committed pages in the
 225  * virtual address space of a specified process.
 226  *
 227  * PARAMS
 228  *  process  [I] Handle of process.
 229  *  addr     [I] Address of region of committed pages.
 230  *  size     [I] Size of region.
 231  *  new_prot [I] Desired access protection.
 232  *  old_prot [O] Address of variable to get old protection.
 233  *
 234  * RETURNS
 235  *      Success: TRUE.
 236  *      Failure: FALSE.
 237  */
 238 BOOL WINAPI VirtualProtectEx( HANDLE process, LPVOID addr, SIZE_T size,
 239     DWORD new_prot, LPDWORD old_prot )
 240 {
 241     NTSTATUS status = NtProtectVirtualMemory( process, &addr, &size, new_prot, old_prot );
 242     if (status) SetLastError( RtlNtStatusToDosError(status) );
 243     return !status;
 244 }
 245
 246
 247 /***********************************************************************
 248  *             VirtualQuery   (KERNEL32.@)
 249  *
 250  * Provides info about a range of pages in virtual address space.
 251  *
 252  * PARAMS
 253  *  addr [I] Address of region.
 254  *  info [O] Address of info buffer.
 255  *  len  [I] Size of buffer.
 256  *
 257  * RETURNS
 258  *      Number of bytes returned in information buffer or 0 if
 259  *      addr >= 0xc0000000 (kernel space).
 260  */
 261 SIZE_T WINAPI VirtualQuery( LPCVOID addr, PMEMORY_BASIC_INFORMATION info,
 262     SIZE_T len )
 263 {
 264     return VirtualQueryEx( GetCurrentProcess(), addr, info, len );
 265 }
 266
 267
 268 /***********************************************************************
 269  *             VirtualQueryEx   (KERNEL32.@)
 270  *
 271  * Provides info about a range of pages in virtual address space of a
 272  * specified process.
 273  *
 274  * PARAMS
 275  *  process [I] Handle to process.
 276  *  addr    [I] Address of region.
 277  *  info    [O] Address of info buffer.
 278  *  len     [I] Size of buffer.
 279  *
 280  * RETURNS
 281  *      Number of bytes returned in information buffer.
 282  */
 283 SIZE_T WINAPI VirtualQueryEx( HANDLE process, LPCVOID addr,
 284     PMEMORY_BASIC_INFORMATION info, SIZE_T len )
 285 {
 286     SIZE_T ret;
 287     NTSTATUS status;
 288
 289     if ((status = NtQueryVirtualMemory( process, addr, MemoryBasicInformation, info, len, &ret )))
 290     {
 291         SetLastError( RtlNtStatusToDosError(status) );
 292         ret = 0;
 293     }
 294     return ret;
 295 }
 296
 297
 298 /***********************************************************************
 299  *             CreateFileMappingA   (KERNEL32.@)
 300  *
 301  * Creates a named or unnamed file-mapping object for the specified file.
 302  *
 303  * PARAMS
 304  *  hFile     [I] Handle to the file to map.
 305  *  sa        [I] Optional security attributes.
 306  *  protect   [I] Protection for mapping object.
 307  *  size_high [I] High-order 32 bits of object size.
 308  *  size_low  [I] Low-order 32 bits of object size.
 309  *  name      [I] Name of file-mapping object.
 310  *
 311  * RETURNS
 312  *      Success: Handle.
 313  *      Failure: NULL. Mapping object does not exist.
 314  */
 315 HANDLE WINAPI CreateFileMappingA( HANDLE hFile, SECURITY_ATTRIBUTES *sa,
 316     DWORD protect, DWORD size_high, DWORD size_low, LPCSTR name )
 317 {
 318     WCHAR buffer[MAX_PATH];
 319
 320     if (!name) return CreateFileMappingW( hFile, sa, protect, size_high, size_low, NULL );
 321
 322     if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
 323     {
 324         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 325         return 0;
 326     }
 327     return CreateFileMappingW( hFile, sa, protect, size_high, size_low, buffer );
 328 }
 329
 330
 331 /***********************************************************************
 332  *             CreateFileMappingW   (KERNEL32.@)
 333  *
 334  * See CreateFileMappingA.
 335  */
 336 HANDLE WINAPI CreateFileMappingW( HANDLE hFile, LPSECURITY_ATTRIBUTES sa,
 337                                   DWORD protect, DWORD size_high,
 338                                   DWORD size_low, LPCWSTR name )
 339 {
 340     static const int sec_flags = SEC_FILE | SEC_IMAGE | SEC_RESERVE | SEC_COMMIT | SEC_NOCACHE;
 341
 342     HANDLE ret;
 343     NTSTATUS status;
 344     DWORD access, sec_type;
 345     LARGE_INTEGER size;
 346
 347     sec_type = protect & sec_flags;
 348     protect &= ~sec_flags;
 349     if (!sec_type) sec_type = SEC_COMMIT;
 350
 351     /* Win9x compatibility */
 352     if (!protect && (GetVersion() & 0x80000000)) protect = PAGE_READONLY;
 353
 354     switch(protect)
 355     {
 356     case PAGE_READONLY:
 357     case PAGE_WRITECOPY:
 358         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_EXECUTE;
 359         break;
 360     case PAGE_READWRITE:
 361         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE | SECTION_MAP_EXECUTE;
 362         break;
 363     case PAGE_EXECUTE_READ:
 364     case PAGE_EXECUTE_WRITECOPY:
 365         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_EXECUTE | SECTION_MAP_EXECUTE_EXPLICIT;
 366         break;
 367     case PAGE_EXECUTE_READWRITE:
 368         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE | SECTION_MAP_EXECUTE | SECTION_MAP_EXECUTE_EXPLICIT;
 369         break;
 370     default:
 371         SetLastError( ERROR_INVALID_PARAMETER );
 372         return 0;
 373     }
 374
 375     if (hFile == INVALID_HANDLE_VALUE)
 376     {
 377         hFile = 0;
 378         if (!size_low && !size_high)
 379         {
 380             SetLastError( ERROR_INVALID_PARAMETER );
 381             return 0;
 382         }
 383     }
 384
 385     size.u.LowPart  = size_low;
 386     size.u.HighPart = size_high;
 387
 388     if (sa || name)
 389     {
 390         OBJECT_ATTRIBUTES attr;
 391         UNICODE_STRING nameW;
 392
 393         attr.Length                   = sizeof(attr);
 394         attr.RootDirectory            = 0;
 395         attr.ObjectName               = NULL;
 396         attr.Attributes               = OBJ_OPENIF | ((sa && sa->bInheritHandle) ? OBJ_INHERIT : 0);
 397         attr.SecurityDescriptor       = sa ? sa->lpSecurityDescriptor : NULL;
 398         attr.SecurityQualityOfService = NULL;
 399         if (name)
 400         {
 401             RtlInitUnicodeString( &nameW, name );
 402             attr.ObjectName = &nameW;
 403             attr.RootDirectory = get_BaseNamedObjects_handle();
 404         }
 405         status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
 406     }
 407     else status = NtCreateSection( &ret, access, NULL, &size, protect, sec_type, hFile );
 408
 409     if (status == STATUS_OBJECT_NAME_EXISTS)
 410         SetLastError( ERROR_ALREADY_EXISTS );
 411     else
 412         SetLastError( RtlNtStatusToDosError(status) );
 413     return ret;
 414 }
 415
 416
 417 /***********************************************************************
 418  *             OpenFileMappingA   (KERNEL32.@)
 419  *
 420  * Opens a named file-mapping object.
 421  *
 422  * PARAMS
 423  *  access  [I] Access mode.
 424  *  inherit [I] Inherit flag.
 425  *  name    [I] Name of file-mapping object.
 426  *
 427  * RETURNS
 428  *      Success: Handle.
 429  *      Failure: NULL.
 430  */
 431 HANDLE WINAPI OpenFileMappingA( DWORD access, BOOL inherit, LPCSTR name )
 432 {
 433     WCHAR buffer[MAX_PATH];
 434
 435     if (!name) return OpenFileMappingW( access, inherit, NULL );
 436
 437     if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
 438     {
 439         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 440         return 0;
 441     }
 442     return OpenFileMappingW( access, inherit, buffer );
 443 }
 444
 445
 446 /***********************************************************************
 447  *             OpenFileMappingW   (KERNEL32.@)
 448  *
 449  * See OpenFileMappingA.
 450  */
 451 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
 452 {
 453     OBJECT_ATTRIBUTES attr;
 454     UNICODE_STRING nameW;
 455     HANDLE ret;
 456     NTSTATUS status;
 457
 458     if (!name)
 459     {
 460         SetLastError( ERROR_INVALID_PARAMETER );
 461         return 0;
 462     }
 463     attr.Length = sizeof(attr);
 464     attr.RootDirectory = get_BaseNamedObjects_handle();
 465     attr.ObjectName = &nameW;
 466     attr.Attributes = inherit ? OBJ_INHERIT : 0;
 467     attr.SecurityDescriptor = NULL;
 468     attr.SecurityQualityOfService = NULL;
 469     RtlInitUnicodeString( &nameW, name );
 470
 471     if (access == FILE_MAP_COPY) access = SECTION_MAP_READ;
 472     access |= SECTION_QUERY;
 473
 474     if (GetVersion() & 0x80000000)
 475     {
 476         /* win9x doesn't do access checks, so try with full access first */
 477         if (!NtOpenSection( &ret, access | SECTION_MAP_READ | SECTION_MAP_WRITE, &attr )) return ret;
 478     }
 479
 480     if ((status = NtOpenSection( &ret, access, &attr )))
 481     {
 482         SetLastError( RtlNtStatusToDosError(status) );
 483         ret = 0;
 484     }
 485     return ret;
 486 }
 487
 488
 489 /***********************************************************************
 490  *             MapViewOfFile   (KERNEL32.@)
 491  *
 492  * Maps a view of a file into the address space.
 493  *
 494  * PARAMS
 495  *  mapping     [I] File-mapping object to map.
 496  *  access      [I] Access mode.
 497  *  offset_high [I] High-order 32 bits of file offset.
 498  *  offset_low  [I] Low-order 32 bits of file offset.
 499  *  count       [I] Number of bytes to map.
 500  *
 501  * RETURNS
 502  *      Success: Starting address of mapped view.
 503  *      Failure: NULL.
 504  */
 505 LPVOID WINAPI MapViewOfFile( HANDLE mapping, DWORD access,
 506     DWORD offset_high, DWORD offset_low, SIZE_T count )
 507 {
 508     return MapViewOfFileEx( mapping, access, offset_high,
 509                             offset_low, count, NULL );
 510 }
 511
 512
 513 /***********************************************************************
 514  *             MapViewOfFileEx   (KERNEL32.@)
 515  *
 516  * Maps a view of a file into the address space.
 517  *
 518  * PARAMS
 519  *  handle      [I] File-mapping object to map.
 520  *  access      [I] Access mode.
 521  *  offset_high [I] High-order 32 bits of file offset.
 522  *  offset_low  [I] Low-order 32 bits of file offset.
 523  *  count       [I] Number of bytes to map.
 524  *  addr        [I] Suggested starting address for mapped view.
 525  *
 526  * RETURNS
 527  *      Success: Starting address of mapped view.
 528  *      Failure: NULL.
 529  */
 530 LPVOID WINAPI MapViewOfFileEx( HANDLE handle, DWORD access,
 531     DWORD offset_high, DWORD offset_low, SIZE_T count, LPVOID addr )
 532 {
 533     NTSTATUS status;
 534     LARGE_INTEGER offset;
 535     ULONG protect;
 536     BOOL exec;
 537
 538     offset.u.LowPart  = offset_low;
 539     offset.u.HighPart = offset_high;
 540
 541     exec = access & FILE_MAP_EXECUTE;
 542     access &= ~FILE_MAP_EXECUTE;
 543
 544     if (access == FILE_MAP_COPY)
 545         protect = exec ? PAGE_EXECUTE_WRITECOPY : PAGE_WRITECOPY;
 546     else if (access & FILE_MAP_WRITE)
 547         protect = exec ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE;
 548     else if (access & FILE_MAP_READ)
 549         protect = exec ? PAGE_EXECUTE_READ : PAGE_READONLY;
 550     else protect = PAGE_NOACCESS;
 551
 552     if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
 553                                       &count, ViewShare, 0, protect )) < 0)
 554     {
 555         SetLastError( RtlNtStatusToDosError(status) );
 556         addr = NULL;
 557     }
 558     return addr;
 559 }
 560
 561
 562 /***********************************************************************
 563  *             UnmapViewOfFile   (KERNEL32.@)
 564  *
 565  * Unmaps a mapped view of a file.
 566  *
 567  * PARAMS
 568  *  addr [I] Address where mapped view begins.
 569  *
 570  * RETURNS
 571  *      Success: TRUE.
 572  *      Failure: FALSE.
 573  *
 574  */
 575 BOOL WINAPI UnmapViewOfFile( LPCVOID addr )
 576 {
 577     NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
 578     if (status) SetLastError( RtlNtStatusToDosError(status) );
 579     return !status;
 580 }
 581
 582
 583 /***********************************************************************
 584  *             FlushViewOfFile   (KERNEL32.@)
 585  *
 586  * Writes to the disk a byte range within a mapped view of a file.
 587  *
 588  * PARAMS
 589  *  base [I] Start address of byte range to flush.
 590  *  size [I] Number of bytes in range.
 591  *
 592  * RETURNS
 593  *      Success: TRUE.
 594  *      Failure: FALSE.
 595  */
 596 BOOL WINAPI FlushViewOfFile( LPCVOID base, SIZE_T size )
 597 {
 598     NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
 599     if (status)
 600     {
 601         if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
 602         else SetLastError( RtlNtStatusToDosError(status) );
 603     }
 604     return !status;
 605 }
 606
 607
 608 /***********************************************************************
 609  *             GetWriteWatch   (KERNEL32.@)
 610  */
 611 UINT WINAPI GetWriteWatch( DWORD flags, LPVOID base, SIZE_T size, LPVOID *addresses,
 612                            ULONG_PTR *count, ULONG *granularity )
 613 {
 614     NTSTATUS status;
 615
 616     status = NtGetWriteWatch( GetCurrentProcess(), flags, base, size, addresses, count, granularity );
 617     if (status) SetLastError( RtlNtStatusToDosError(status) );
 618     return status ? ~0u : 0;
 619 }
 620
 621
 622 /***********************************************************************
 623  *             ResetWriteWatch   (KERNEL32.@)
 624  */
 625 UINT WINAPI ResetWriteWatch( LPVOID base, SIZE_T size )
 626 {
 627     NTSTATUS status;
 628
 629     status = NtResetWriteWatch( GetCurrentProcess(), base, size );
 630     if (status) SetLastError( RtlNtStatusToDosError(status) );
 631     return status ? ~0u : 0;
 632 }
 633
 634
 635 /***********************************************************************
 636  *             IsBadReadPtr   (KERNEL32.@)
 637  *
 638  * Check for read access on a memory block.
 639  *
 640  * ptr  [I] Address of memory block.
 641  * size [I] Size of block.
 642  *
 643  * RETURNS
 644  *  Success: TRUE.
 645  *      Failure: FALSE. Process has read access to entire block.
 646  */
 647 BOOL WINAPI IsBadReadPtr( LPCVOID ptr, UINT size )
 648 {
 649     if (!size) return FALSE;  /* handle 0 size case w/o reference */
 650     if (!ptr) return TRUE;
 651
 652     if (!page_size) page_size = getpagesize();
 653     __TRY
 654     {
 655         volatile const char *p = ptr;
 656         char dummy __attribute__((unused));
 657         UINT count = size;
 658
 659         while (count > page_size)
 660         {
 661             dummy = *p;
 662             p += page_size;
 663             count -= page_size;
 664         }
 665         dummy = p[0];
 666         dummy = p[count - 1];
 667     }
 668     __EXCEPT_PAGE_FAULT
 669     {
 670         TRACE_(seh)("%p caused page fault during read\n", ptr);
 671         return TRUE;
 672     }
 673     __ENDTRY
 674     return FALSE;
 675 }
 676
 677
 678 /***********************************************************************
 679  *             IsBadWritePtr   (KERNEL32.@)
 680  *
 681  * Check for write access on a memory block.
 682  *
 683  * PARAMS
 684  *  ptr  [I] Address of memory block.
 685  *  size [I] Size of block in bytes.
 686  *
 687  * RETURNS
 688  *  Success: TRUE.
 689  *      Failure: FALSE. Process has write access to entire block.
 690  */
 691 BOOL WINAPI IsBadWritePtr( LPVOID ptr, UINT size )
 692 {
 693     if (!size) return FALSE;  /* handle 0 size case w/o reference */
 694     if (!ptr) return TRUE;
 695
 696     if (!page_size) page_size = getpagesize();
 697     __TRY
 698     {
 699         volatile char *p = ptr;
 700         UINT count = size;
 701
 702         while (count > page_size)
 703         {
 704             *p |= 0;
 705             p += page_size;
 706             count -= page_size;
 707         }
 708         p[0] |= 0;
 709         p[count - 1] |= 0;
 710     }
 711     __EXCEPT_PAGE_FAULT
 712     {
 713         TRACE_(seh)("%p caused page fault during write\n", ptr);
 714         return TRUE;
 715     }
 716     __ENDTRY
 717     return FALSE;
 718 }
 719
 720
 721 /***********************************************************************
 722  *             IsBadHugeReadPtr   (KERNEL32.@)
 723  *
 724  * Check for read access on a memory block.
 725  *
 726  * PARAMS
 727  *  ptr  [I] Address of memory block.
 728  *  size [I] Size of block.
 729  *
 730  * RETURNS
 731  *  Success: TRUE.
 732  *      Failure: FALSE. Process has read access to entire block.
 733  */
 734 BOOL WINAPI IsBadHugeReadPtr( LPCVOID ptr, UINT size )
 735 {
 736     return IsBadReadPtr( ptr, size );
 737 }
 738
 739
 740 /***********************************************************************
 741  *             IsBadHugeWritePtr   (KERNEL32.@)
 742  *
 743  * Check for write access on a memory block.
 744  *
 745  * PARAMS
 746  *  ptr  [I] Address of memory block.
 747  *  size [I] Size of block.
 748  *
 749  * RETURNS
 750  *  Success: TRUE.
 751  *      Failure: FALSE. Process has write access to entire block.
 752  */
 753 BOOL WINAPI IsBadHugeWritePtr( LPVOID ptr, UINT size )
 754 {
 755     return IsBadWritePtr( ptr, size );
 756 }
 757
 758
 759 /***********************************************************************
 760  *             IsBadCodePtr   (KERNEL32.@)
 761  *
 762  * Check for read access on a memory address.
 763  *
 764  * PARAMS
 765  *  ptr [I] Address of function.
 766  *
 767  * RETURNS
 768  *      Success: TRUE.
 769  *      Failure: FALSE. Process has read access to specified memory.
 770  */
 771 BOOL WINAPI IsBadCodePtr( FARPROC ptr )
 772 {
 773     return IsBadReadPtr( ptr, 1 );
 774 }
 775
 776
 777 /***********************************************************************
 778  *             IsBadStringPtrA   (KERNEL32.@)
 779  *
 780  * Check for read access on a range of memory pointed to by a string pointer.
 781  *
 782  * PARAMS
 783  *  str [I] Address of string.
 784  *  max [I] Maximum size of string.
 785  *
 786  * RETURNS
 787  *      Success: TRUE.
 788  *      Failure: FALSE. Read access to all bytes in string.
 789  */
 790 BOOL WINAPI IsBadStringPtrA( LPCSTR str, UINT max )
 791 {
 792     if (!str) return TRUE;
 793
 794     __TRY
 795     {
 796         volatile const char *p = str;
 797         while (p != str + max) if (!*p++) break;
 798     }
 799     __EXCEPT_PAGE_FAULT
 800     {
 801         TRACE_(seh)("%p caused page fault during read\n", str);
 802         return TRUE;
 803     }
 804     __ENDTRY
 805     return FALSE;
 806 }
 807
 808
 809 /***********************************************************************
 810  *             IsBadStringPtrW   (KERNEL32.@)
 811  *
 812  * See IsBadStringPtrA.
 813  */
 814 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
 815 {
 816     if (!str) return TRUE;
 817
 818     __TRY
 819     {
 820         volatile const WCHAR *p = str;
 821         while (p != str + max) if (!*p++) break;
 822     }
 823     __EXCEPT_PAGE_FAULT
 824     {
 825         TRACE_(seh)("%p caused page fault during read\n", str);
 826         return TRUE;
 827     }
 828     __ENDTRY
 829     return FALSE;
 830 }
 831
 832 /***********************************************************************
 833  *           K32GetMappedFileNameA (KERNEL32.@)
 834  */
 835 DWORD WINAPI K32GetMappedFileNameA(HANDLE process, LPVOID lpv, LPSTR file_name, DWORD size)
 836 {
 837     FIXME_(file)("(%p, %p, %p, %d): stub\n", process, lpv, file_name, size);
 838
 839     if (file_name && size)
 840         file_name[0] = '\0';
 841
 842     return 0;
 843 }
 844
 845 /***********************************************************************
 846  *           K32GetMappedFileNameW (KERNEL32.@)
 847  */
 848 DWORD WINAPI K32GetMappedFileNameW(HANDLE process, LPVOID lpv, LPWSTR file_name, DWORD size)
 849 {
 850     FIXME_(file)("(%p, %p, %p, %d): stub\n", process, lpv, file_name, size);
 851
 852     if (file_name && size)
 853         file_name[0] = '\0';
 854
 855     return 0;
 856 }
 857
 858 /***********************************************************************
 859  *           K32EnumPageFilesA (KERNEL32.@)
 860  */
 861 BOOL WINAPI K32EnumPageFilesA( PENUM_PAGE_FILE_CALLBACKA callback, LPVOID context )
 862 {
 863     FIXME_(file)("(%p, %p) stub\n", callback, context );
 864     return FALSE;
 865 }
 866
 867 /***********************************************************************
 868  *           K32EnumPageFilesW (KERNEL32.@)
 869  */
 870 BOOL WINAPI K32EnumPageFilesW( PENUM_PAGE_FILE_CALLBACKW callback, LPVOID context )
 871 {
 872     FIXME_(file)("(%p, %p) stub\n", callback, context );
 873     return FALSE;
 874 }
 875
 876 /***********************************************************************
 877  *           K32GetWsChanges (KERNEL32.@)
 878  */
 879 BOOL WINAPI K32GetWsChanges(HANDLE process, PPSAPI_WS_WATCH_INFORMATION watchinfo, DWORD size)
 880 {
 881     NTSTATUS status;
 882
 883     TRACE_(seh)("(%p, %p, %d)\n", process, watchinfo, size);
 884
 885     status = NtQueryInformationProcess( process, ProcessWorkingSetWatch, watchinfo, size, NULL );
 886
 887     if (status)
 888     {
 889         SetLastError( RtlNtStatusToDosError( status ) );
 890         return FALSE;
 891     }
 892     return TRUE;
 893 }
 894
 895 /***********************************************************************
 896  *           K32InitializeProcessForWsWatch (KERNEL32.@)
 897  */
 898 BOOL WINAPI K32InitializeProcessForWsWatch(HANDLE process)
 899 {
 900     FIXME_(seh)("(process=%p): stub\n", process);
 901
 902     return TRUE;
 903 }