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     switch(protect)
 352     {
 353     case 0:
 354         protect = PAGE_READONLY;  /* Win9x compatibility */
 355         /* fall through */
 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:
 364         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_EXECUTE | SECTION_MAP_EXECUTE_EXPLICIT;
 365         break;
 366     case PAGE_EXECUTE_READ:
 367     case PAGE_EXECUTE_WRITECOPY:
 368         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_EXECUTE | SECTION_MAP_EXECUTE_EXPLICIT;
 369         break;
 370     case PAGE_EXECUTE_READWRITE:
 371         access = STANDARD_RIGHTS_REQUIRED | SECTION_QUERY | SECTION_MAP_READ | SECTION_MAP_WRITE | SECTION_MAP_EXECUTE | SECTION_MAP_EXECUTE_EXPLICIT;
 372         break;
 373     default:
 374         SetLastError( ERROR_INVALID_PARAMETER );
 375         return 0;
 376     }
 377
 378     if (hFile == INVALID_HANDLE_VALUE)
 379     {
 380         hFile = 0;
 381         if (!size_low && !size_high)
 382         {
 383             SetLastError( ERROR_INVALID_PARAMETER );
 384             return 0;
 385         }
 386     }
 387
 388     size.u.LowPart  = size_low;
 389     size.u.HighPart = size_high;
 390
 391     if (sa || name)
 392     {
 393         OBJECT_ATTRIBUTES attr;
 394         UNICODE_STRING nameW;
 395
 396         attr.Length                   = sizeof(attr);
 397         attr.RootDirectory            = 0;
 398         attr.ObjectName               = NULL;
 399         attr.Attributes               = OBJ_OPENIF | ((sa && sa->bInheritHandle) ? OBJ_INHERIT : 0);
 400         attr.SecurityDescriptor       = sa ? sa->lpSecurityDescriptor : NULL;
 401         attr.SecurityQualityOfService = NULL;
 402         if (name)
 403         {
 404             RtlInitUnicodeString( &nameW, name );
 405             attr.ObjectName = &nameW;
 406             attr.RootDirectory = get_BaseNamedObjects_handle();
 407         }
 408         status = NtCreateSection( &ret, access, &attr, &size, protect, sec_type, hFile );
 409     }
 410     else status = NtCreateSection( &ret, access, NULL, &size, protect, sec_type, hFile );
 411
 412     if (status == STATUS_OBJECT_NAME_EXISTS)
 413         SetLastError( ERROR_ALREADY_EXISTS );
 414     else
 415         SetLastError( RtlNtStatusToDosError(status) );
 416     return ret;
 417 }
 418
 419
 420 /***********************************************************************
 421  *             OpenFileMappingA   (KERNEL32.@)
 422  *
 423  * Opens a named file-mapping object.
 424  *
 425  * PARAMS
 426  *  access  [I] Access mode.
 427  *  inherit [I] Inherit flag.
 428  *  name    [I] Name of file-mapping object.
 429  *
 430  * RETURNS
 431  *      Success: Handle.
 432  *      Failure: NULL.
 433  */
 434 HANDLE WINAPI OpenFileMappingA( DWORD access, BOOL inherit, LPCSTR name )
 435 {
 436     WCHAR buffer[MAX_PATH];
 437
 438     if (!name) return OpenFileMappingW( access, inherit, NULL );
 439
 440     if (!MultiByteToWideChar( CP_ACP, 0, name, -1, buffer, MAX_PATH ))
 441     {
 442         SetLastError( ERROR_FILENAME_EXCED_RANGE );
 443         return 0;
 444     }
 445     return OpenFileMappingW( access, inherit, buffer );
 446 }
 447
 448
 449 /***********************************************************************
 450  *             OpenFileMappingW   (KERNEL32.@)
 451  *
 452  * See OpenFileMappingA.
 453  */
 454 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
 455 {
 456     OBJECT_ATTRIBUTES attr;
 457     UNICODE_STRING nameW;
 458     HANDLE ret;
 459     NTSTATUS status;
 460
 461     if (!name)
 462     {
 463         SetLastError( ERROR_INVALID_PARAMETER );
 464         return 0;
 465     }
 466     attr.Length = sizeof(attr);
 467     attr.RootDirectory = get_BaseNamedObjects_handle();
 468     attr.ObjectName = &nameW;
 469     attr.Attributes = inherit ? OBJ_INHERIT : 0;
 470     attr.SecurityDescriptor = NULL;
 471     attr.SecurityQualityOfService = NULL;
 472     RtlInitUnicodeString( &nameW, name );
 473
 474     if (access == FILE_MAP_COPY) access = SECTION_MAP_READ;
 475     access |= SECTION_QUERY;
 476
 477     if (GetVersion() & 0x80000000)
 478     {
 479         /* win9x doesn't do access checks, so try with full access first */
 480         if (!NtOpenSection( &ret, access | SECTION_MAP_READ | SECTION_MAP_WRITE, &attr )) return ret;
 481     }
 482
 483     if ((status = NtOpenSection( &ret, access, &attr )))
 484     {
 485         SetLastError( RtlNtStatusToDosError(status) );
 486         ret = 0;
 487     }
 488     return ret;
 489 }
 490
 491
 492 /***********************************************************************
 493  *             MapViewOfFile   (KERNEL32.@)
 494  *
 495  * Maps a view of a file into the address space.
 496  *
 497  * PARAMS
 498  *  mapping     [I] File-mapping object to map.
 499  *  access      [I] Access mode.
 500  *  offset_high [I] High-order 32 bits of file offset.
 501  *  offset_low  [I] Low-order 32 bits of file offset.
 502  *  count       [I] Number of bytes to map.
 503  *
 504  * RETURNS
 505  *      Success: Starting address of mapped view.
 506  *      Failure: NULL.
 507  */
 508 LPVOID WINAPI MapViewOfFile( HANDLE mapping, DWORD access,
 509     DWORD offset_high, DWORD offset_low, SIZE_T count )
 510 {
 511     return MapViewOfFileEx( mapping, access, offset_high,
 512                             offset_low, count, NULL );
 513 }
 514
 515
 516 /***********************************************************************
 517  *             MapViewOfFileEx   (KERNEL32.@)
 518  *
 519  * Maps a view of a file into the address space.
 520  *
 521  * PARAMS
 522  *  handle      [I] File-mapping object to map.
 523  *  access      [I] Access mode.
 524  *  offset_high [I] High-order 32 bits of file offset.
 525  *  offset_low  [I] Low-order 32 bits of file offset.
 526  *  count       [I] Number of bytes to map.
 527  *  addr        [I] Suggested starting address for mapped view.
 528  *
 529  * RETURNS
 530  *      Success: Starting address of mapped view.
 531  *      Failure: NULL.
 532  */
 533 LPVOID WINAPI MapViewOfFileEx( HANDLE handle, DWORD access,
 534     DWORD offset_high, DWORD offset_low, SIZE_T count, LPVOID addr )
 535 {
 536     NTSTATUS status;
 537     LARGE_INTEGER offset;
 538     ULONG protect;
 539
 540     offset.u.LowPart  = offset_low;
 541     offset.u.HighPart = offset_high;
 542
 543     if (access & FILE_MAP_WRITE) protect = PAGE_READWRITE;
 544     else if (access & FILE_MAP_COPY) protect = PAGE_WRITECOPY;
 545     else protect = PAGE_READONLY;
 546
 547     if (access & FILE_MAP_EXECUTE) protect <<= 4;
 548
 549     if ((status = NtMapViewOfSection( handle, GetCurrentProcess(), &addr, 0, 0, &offset,
 550                                       &count, ViewShare, 0, protect )) < 0)
 551     {
 552         SetLastError( RtlNtStatusToDosError(status) );
 553         addr = NULL;
 554     }
 555     return addr;
 556 }
 557
 558
 559 /***********************************************************************
 560  *             UnmapViewOfFile   (KERNEL32.@)
 561  *
 562  * Unmaps a mapped view of a file.
 563  *
 564  * PARAMS
 565  *  addr [I] Address where mapped view begins.
 566  *
 567  * RETURNS
 568  *      Success: TRUE.
 569  *      Failure: FALSE.
 570  *
 571  */
 572 BOOL WINAPI UnmapViewOfFile( LPCVOID addr )
 573 {
 574     NTSTATUS status = NtUnmapViewOfSection( GetCurrentProcess(), (void *)addr );
 575     if (status) SetLastError( RtlNtStatusToDosError(status) );
 576     return !status;
 577 }
 578
 579
 580 /***********************************************************************
 581  *             FlushViewOfFile   (KERNEL32.@)
 582  *
 583  * Writes to the disk a byte range within a mapped view of a file.
 584  *
 585  * PARAMS
 586  *  base [I] Start address of byte range to flush.
 587  *  size [I] Number of bytes in range.
 588  *
 589  * RETURNS
 590  *      Success: TRUE.
 591  *      Failure: FALSE.
 592  */
 593 BOOL WINAPI FlushViewOfFile( LPCVOID base, SIZE_T size )
 594 {
 595     NTSTATUS status = NtFlushVirtualMemory( GetCurrentProcess(), &base, &size, 0 );
 596     if (status)
 597     {
 598         if (status == STATUS_NOT_MAPPED_DATA) status = STATUS_SUCCESS;
 599         else SetLastError( RtlNtStatusToDosError(status) );
 600     }
 601     return !status;
 602 }
 603
 604
 605 /***********************************************************************
 606  *             GetWriteWatch   (KERNEL32.@)
 607  */
 608 UINT WINAPI GetWriteWatch( DWORD flags, LPVOID base, SIZE_T size, LPVOID *addresses,
 609                            ULONG_PTR *count, ULONG *granularity )
 610 {
 611     NTSTATUS status;
 612
 613     status = NtGetWriteWatch( GetCurrentProcess(), flags, base, size, addresses, count, granularity );
 614     if (status) SetLastError( RtlNtStatusToDosError(status) );
 615     return status ? ~0u : 0;
 616 }
 617
 618
 619 /***********************************************************************
 620  *             ResetWriteWatch   (KERNEL32.@)
 621  */
 622 UINT WINAPI ResetWriteWatch( LPVOID base, SIZE_T size )
 623 {
 624     NTSTATUS status;
 625
 626     status = NtResetWriteWatch( GetCurrentProcess(), base, size );
 627     if (status) SetLastError( RtlNtStatusToDosError(status) );
 628     return status ? ~0u : 0;
 629 }
 630
 631
 632 /***********************************************************************
 633  *             IsBadReadPtr   (KERNEL32.@)
 634  *
 635  * Check for read access on a memory block.
 636  *
 637  * ptr  [I] Address of memory block.
 638  * size [I] Size of block.
 639  *
 640  * RETURNS
 641  *  Success: TRUE.
 642  *      Failure: FALSE. Process has read access to entire block.
 643  */
 644 BOOL WINAPI IsBadReadPtr( LPCVOID ptr, UINT size )
 645 {
 646     if (!size) return FALSE;  /* handle 0 size case w/o reference */
 647     if (!ptr) return TRUE;
 648
 649     if (!page_size) page_size = getpagesize();
 650     __TRY
 651     {
 652         volatile const char *p = ptr;
 653         char dummy;
 654         UINT count = size;
 655
 656         while (count > page_size)
 657         {
 658             dummy = *p;
 659             p += page_size;
 660             count -= page_size;
 661         }
 662         dummy = p[0];
 663         dummy = p[count - 1];
 664     }
 665     __EXCEPT_PAGE_FAULT
 666     {
 667         TRACE_(seh)("%p caused page fault during read\n", ptr);
 668         return TRUE;
 669     }
 670     __ENDTRY
 671     return FALSE;
 672 }
 673
 674
 675 /***********************************************************************
 676  *             IsBadWritePtr   (KERNEL32.@)
 677  *
 678  * Check for write access on a memory block.
 679  *
 680  * PARAMS
 681  *  ptr  [I] Address of memory block.
 682  *  size [I] Size of block in bytes.
 683  *
 684  * RETURNS
 685  *  Success: TRUE.
 686  *      Failure: FALSE. Process has write access to entire block.
 687  */
 688 BOOL WINAPI IsBadWritePtr( LPVOID ptr, UINT size )
 689 {
 690     if (!size) return FALSE;  /* handle 0 size case w/o reference */
 691     if (!ptr) return TRUE;
 692
 693     if (!page_size) page_size = getpagesize();
 694     __TRY
 695     {
 696         volatile char *p = ptr;
 697         UINT count = size;
 698
 699         while (count > page_size)
 700         {
 701             *p |= 0;
 702             p += page_size;
 703             count -= page_size;
 704         }
 705         p[0] |= 0;
 706         p[count - 1] |= 0;
 707     }
 708     __EXCEPT_PAGE_FAULT
 709     {
 710         TRACE_(seh)("%p caused page fault during write\n", ptr);
 711         return TRUE;
 712     }
 713     __ENDTRY
 714     return FALSE;
 715 }
 716
 717
 718 /***********************************************************************
 719  *             IsBadHugeReadPtr   (KERNEL32.@)
 720  *
 721  * Check for read access on a memory block.
 722  *
 723  * PARAMS
 724  *  ptr  [I] Address of memory block.
 725  *  size [I] Size of block.
 726  *
 727  * RETURNS
 728  *  Success: TRUE.
 729  *      Failure: FALSE. Process has read access to entire block.
 730  */
 731 BOOL WINAPI IsBadHugeReadPtr( LPCVOID ptr, UINT size )
 732 {
 733     return IsBadReadPtr( ptr, size );
 734 }
 735
 736
 737 /***********************************************************************
 738  *             IsBadHugeWritePtr   (KERNEL32.@)
 739  *
 740  * Check for write access on a memory block.
 741  *
 742  * PARAMS
 743  *  ptr  [I] Address of memory block.
 744  *  size [I] Size of block.
 745  *
 746  * RETURNS
 747  *  Success: TRUE.
 748  *      Failure: FALSE. Process has write access to entire block.
 749  */
 750 BOOL WINAPI IsBadHugeWritePtr( LPVOID ptr, UINT size )
 751 {
 752     return IsBadWritePtr( ptr, size );
 753 }
 754
 755
 756 /***********************************************************************
 757  *             IsBadCodePtr   (KERNEL32.@)
 758  *
 759  * Check for read access on a memory address.
 760  *
 761  * PARAMS
 762  *  ptr [I] Address of function.
 763  *
 764  * RETURNS
 765  *      Success: TRUE.
 766  *      Failure: FALSE. Process has read access to specified memory.
 767  */
 768 BOOL WINAPI IsBadCodePtr( FARPROC ptr )
 769 {
 770     return IsBadReadPtr( ptr, 1 );
 771 }
 772
 773
 774 /***********************************************************************
 775  *             IsBadStringPtrA   (KERNEL32.@)
 776  *
 777  * Check for read access on a range of memory pointed to by a string pointer.
 778  *
 779  * PARAMS
 780  *  str [I] Address of string.
 781  *  max [I] Maximum size of string.
 782  *
 783  * RETURNS
 784  *      Success: TRUE.
 785  *      Failure: FALSE. Read access to all bytes in string.
 786  */
 787 BOOL WINAPI IsBadStringPtrA( LPCSTR str, UINT max )
 788 {
 789     if (!str) return TRUE;
 790
 791     __TRY
 792     {
 793         volatile const char *p = str;
 794         while (p != str + max) if (!*p++) break;
 795     }
 796     __EXCEPT_PAGE_FAULT
 797     {
 798         TRACE_(seh)("%p caused page fault during read\n", str);
 799         return TRUE;
 800     }
 801     __ENDTRY
 802     return FALSE;
 803 }
 804
 805
 806 /***********************************************************************
 807  *             IsBadStringPtrW   (KERNEL32.@)
 808  *
 809  * See IsBadStringPtrA.
 810  */
 811 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
 812 {
 813     if (!str) return TRUE;
 814
 815     __TRY
 816     {
 817         volatile const WCHAR *p = str;
 818         while (p != str + max) if (!*p++) break;
 819     }
 820     __EXCEPT_PAGE_FAULT
 821     {
 822         TRACE_(seh)("%p caused page fault during read\n", str);
 823         return TRUE;
 824     }
 825     __ENDTRY
 826     return FALSE;
 827 }
 828
 829 /***********************************************************************
 830  *           K32GetMappedFileNameA (KERNEL32.@)
 831  */
 832 DWORD WINAPI K32GetMappedFileNameA(HANDLE process, LPVOID lpv, LPSTR file_name, DWORD size)
 833 {
 834     FIXME_(file)("(%p, %p, %p, %d): stub\n", process, lpv, file_name, size);
 835
 836     if (file_name && size)
 837         file_name[0] = '\0';
 838
 839     return 0;
 840 }
 841
 842 /***********************************************************************
 843  *           K32GetMappedFileNameW (KERNEL32.@)
 844  */
 845 DWORD WINAPI K32GetMappedFileNameW(HANDLE process, LPVOID lpv, LPWSTR file_name, DWORD size)
 846 {
 847     FIXME_(file)("(%p, %p, %p, %d): stub\n", process, lpv, file_name, size);
 848
 849     if (file_name && size)
 850         file_name[0] = '\0';
 851
 852     return 0;
 853 }
 854
 855 /***********************************************************************
 856  *           K32EnumPageFilesA (KERNEL32.@)
 857  */
 858 BOOL WINAPI K32EnumPageFilesA( PENUM_PAGE_FILE_CALLBACKA callback, LPVOID context )
 859 {
 860     FIXME_(file)("(%p, %p) stub\n", callback, context );
 861     return FALSE;
 862 }
 863
 864 /***********************************************************************
 865  *           K32EnumPageFilesW (KERNEL32.@)
 866  */
 867 BOOL WINAPI K32EnumPageFilesW( PENUM_PAGE_FILE_CALLBACKW callback, LPVOID context )
 868 {
 869     FIXME_(file)("(%p, %p) stub\n", callback, context );
 870     return FALSE;
 871 }
 872
 873 /***********************************************************************
 874  *           K32GetWsChanges (KERNEL32.@)
 875  */
 876 BOOL WINAPI K32GetWsChanges(HANDLE process, PPSAPI_WS_WATCH_INFORMATION watchinfo, DWORD size)
 877 {
 878     NTSTATUS status;
 879
 880     TRACE_(seh)("(%p, %p, %d)\n", process, watchinfo, size);
 881
 882     status = NtQueryInformationProcess( process, ProcessWorkingSetWatch, watchinfo, size, NULL );
 883
 884     if (status)
 885     {
 886         SetLastError( RtlNtStatusToDosError( status ) );
 887         return FALSE;
 888     }
 889     return TRUE;
 890 }
 891
 892 /***********************************************************************
 893  *           K32InitializeProcessForWsWatch (KERNEL32.@)
 894  */
 895 BOOL WINAPI K32InitializeProcessForWsWatch(HANDLE process)
 896 {
 897     FIXME_(seh)("(process=%p): stub\n", process);
 898
 899     return TRUE;
 900 }