memory/virtual.c

   1 /*
   2  * Win32 virtual memory functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 #include <assert.h>
  10 #include <errno.h>
  11 #ifdef HAVE_SYS_ERRNO_H
  12 #include <sys/errno.h>
  13 #endif
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <sys/types.h>
  19 #ifdef HAVE_SYS_MMAN_H
  20 #include <sys/mman.h>
  21 #endif
  22 #include "winbase.h"
  23 #include "winerror.h"
  24 #include "file.h"
  25 #include "heap.h"
  26 #include "process.h"
  27 #include "xmalloc.h"
  28 #include "global.h"
  29 #include "server.h"
  30 #include "debugtools.h"
  31
  32 DEFAULT_DEBUG_CHANNEL(virtual)
  33
  34 #ifndef MS_SYNC
  35 #define MS_SYNC 0
  36 #endif
  37
  38 /* File view */
  39 typedef struct _FV
  40 {
  41     struct _FV   *next;        /* Next view */
  42     struct _FV   *prev;        /* Prev view */
  43     UINT        base;        /* Base address */
  44     UINT        size;        /* Size in bytes */
  45     UINT        flags;       /* Allocation flags */
  46     UINT        offset;      /* Offset from start of mapped file */
  47     HANDLE      mapping;     /* Handle to the file mapping */
  48     HANDLERPROC   handlerProc; /* Fault handler */
  49     LPVOID        handlerArg;  /* Fault handler argument */
  50     BYTE          protect;     /* Protection for all pages at allocation time */
  51     BYTE          prot[1];     /* Protection byte for each page */
  52 } FILE_VIEW;
  53
  54 /* Per-view flags */
  55 #define VFLAG_SYSTEM     0x01
  56
  57 /* Conversion from VPROT_* to Win32 flags */
  58 static const BYTE VIRTUAL_Win32Flags[16] =
  59 {
  60     PAGE_NOACCESS,              /* 0 */
  61     PAGE_READONLY,              /* READ */
  62     PAGE_READWRITE,             /* WRITE */
  63     PAGE_READWRITE,             /* READ | WRITE */
  64     PAGE_EXECUTE,               /* EXEC */
  65     PAGE_EXECUTE_READ,          /* READ | EXEC */
  66     PAGE_EXECUTE_READWRITE,     /* WRITE | EXEC */
  67     PAGE_EXECUTE_READWRITE,     /* READ | WRITE | EXEC */
  68     PAGE_WRITECOPY,             /* WRITECOPY */
  69     PAGE_WRITECOPY,             /* READ | WRITECOPY */
  70     PAGE_WRITECOPY,             /* WRITE | WRITECOPY */
  71     PAGE_WRITECOPY,             /* READ | WRITE | WRITECOPY */
  72     PAGE_EXECUTE_WRITECOPY,     /* EXEC | WRITECOPY */
  73     PAGE_EXECUTE_WRITECOPY,     /* READ | EXEC | WRITECOPY */
  74     PAGE_EXECUTE_WRITECOPY,     /* WRITE | EXEC | WRITECOPY */
  75     PAGE_EXECUTE_WRITECOPY      /* READ | WRITE | EXEC | WRITECOPY */
  76 };
  77
  78
  79 static FILE_VIEW *VIRTUAL_FirstView;
  80
  81 #ifdef __i386__
  82 /* These are always the same on an i386, and it will be faster this way */
  83 # define page_mask  0xfff
  84 # define page_shift 12
  85 # define granularity_mask 0xffff
  86 #else
  87 static UINT page_shift;
  88 static UINT page_mask;
  89 static UINT granularity_mask;  /* Allocation granularity (usually 64k) */
  90 #endif  /* __i386__ */
  91
  92 #define ROUND_ADDR(addr) \
  93    ((UINT)(addr) & ~page_mask)
  94
  95 #define ROUND_SIZE(addr,size) \
  96    (((UINT)(size) + ((UINT)(addr) & page_mask) + page_mask) & ~page_mask)
  97
  98 #define VIRTUAL_DEBUG_DUMP_VIEW(view) \
  99    if (!TRACE_ON(virtual)); else VIRTUAL_DumpView(view)
 100
 101 /***********************************************************************
 102  *           VIRTUAL_GetProtStr
 103  */
 104 static const char *VIRTUAL_GetProtStr( BYTE prot )
 105 {
 106     static char buffer[6];
 107     buffer[0] = (prot & VPROT_COMMITTED) ? 'c' : '-';
 108     buffer[1] = (prot & VPROT_GUARD) ? 'g' : '-';
 109     buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
 110     buffer[3] = (prot & VPROT_WRITE) ?
 111                     ((prot & VPROT_WRITECOPY) ? 'w' : 'W') : '-';
 112     buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
 113     buffer[5] = 0;
 114     return buffer;
 115 }
 116
 117
 118 /***********************************************************************
 119  *           VIRTUAL_DumpView
 120  */
 121 static void VIRTUAL_DumpView( FILE_VIEW *view )
 122 {
 123     UINT i, count;
 124     UINT addr = view->base;
 125     BYTE prot = view->prot[0];
 126
 127     DPRINTF( "View: %08x - %08x%s",
 128           view->base, view->base + view->size - 1,
 129           (view->flags & VFLAG_SYSTEM) ? " (system)" : "" );
 130     if (view->mapping)
 131         DPRINTF( " %d @ %08x\n", view->mapping, view->offset );
 132     else
 133         DPRINTF( " (anonymous)\n");
 134
 135     for (count = i = 1; i < view->size >> page_shift; i++, count++)
 136     {
 137         if (view->prot[i] == prot) continue;
 138         DPRINTF( "      %08x - %08x %s\n",
 139               addr, addr + (count << page_shift) - 1,
 140               VIRTUAL_GetProtStr(prot) );
 141         addr += (count << page_shift);
 142         prot = view->prot[i];
 143         count = 0;
 144     }
 145     if (count)
 146         DPRINTF( "      %08x - %08x %s\n",
 147               addr, addr + (count << page_shift) - 1,
 148               VIRTUAL_GetProtStr(prot) );
 149 }
 150
 151
 152 /***********************************************************************
 153  *           VIRTUAL_Dump
 154  */
 155 void VIRTUAL_Dump(void)
 156 {
 157     FILE_VIEW *view = VIRTUAL_FirstView;
 158     DPRINTF( "\nDump of all virtual memory views:\n\n" );
 159     while (view)
 160     {
 161         VIRTUAL_DumpView( view );
 162         view = view->next;
 163     }
 164 }
 165
 166
 167 /***********************************************************************
 168  *           VIRTUAL_FindView
 169  *
 170  * Find the view containing a given address.
 171  *
 172  * RETURNS
 173  *      View: Success
 174  *      NULL: Failure
 175  */
 176 static FILE_VIEW *VIRTUAL_FindView(
 177                   UINT addr /* [in] Address */
 178 ) {
 179     FILE_VIEW *view = VIRTUAL_FirstView;
 180     while (view)
 181     {
 182         if (view->base > addr) return NULL;
 183         if (view->base + view->size > addr) return view;
 184         view = view->next;
 185     }
 186     return NULL;
 187 }
 188
 189
 190 /***********************************************************************
 191  *           VIRTUAL_CreateView
 192  *
 193  * Create a new view and add it in the linked list.
 194  */
 195 static FILE_VIEW *VIRTUAL_CreateView( UINT base, UINT size, UINT offset,
 196                                       UINT flags, BYTE vprot,
 197                                       HANDLE mapping )
 198 {
 199     FILE_VIEW *view, *prev;
 200
 201     /* Create the view structure */
 202
 203     assert( !(base & page_mask) );
 204     assert( !(size & page_mask) );
 205     size >>= page_shift;
 206     if (!(view = (FILE_VIEW *)malloc( sizeof(*view) + size - 1 ))) return NULL;
 207     view->base    = base;
 208     view->size    = size << page_shift;
 209     view->flags   = flags;
 210     view->offset  = offset;
 211     view->mapping = mapping;
 212     view->protect = vprot;
 213     view->handlerProc = NULL;
 214     memset( view->prot, vprot, size );
 215
 216     /* Duplicate the mapping handle */
 217
 218     if ((view->mapping != -1) &&
 219         !DuplicateHandle( GetCurrentProcess(), view->mapping,
 220                           GetCurrentProcess(), &view->mapping,
 221                           0, FALSE, DUPLICATE_SAME_ACCESS ))
 222     {
 223         free( view );
 224         return NULL;
 225     }
 226
 227     /* Insert it in the linked list */
 228
 229     if (!VIRTUAL_FirstView || (VIRTUAL_FirstView->base > base))
 230     {
 231         view->next = VIRTUAL_FirstView;
 232         view->prev = NULL;
 233         if (view->next) view->next->prev = view;
 234         VIRTUAL_FirstView = view;
 235     }
 236     else
 237     {
 238         prev = VIRTUAL_FirstView;
 239         while (prev->next && (prev->next->base < base)) prev = prev->next;
 240         view->next = prev->next;
 241         view->prev = prev;
 242         if (view->next) view->next->prev = view;
 243         prev->next  = view;
 244     }
 245     VIRTUAL_DEBUG_DUMP_VIEW( view );
 246     return view;
 247 }
 248
 249
 250 /***********************************************************************
 251  *           VIRTUAL_DeleteView
 252  * Deletes a view.
 253  *
 254  * RETURNS
 255  *      None
 256  */
 257 static void VIRTUAL_DeleteView(
 258             FILE_VIEW *view /* [in] View */
 259 ) {
 260     FILE_munmap( (void *)view->base, 0, view->size );
 261     if (view->next) view->next->prev = view->prev;
 262     if (view->prev) view->prev->next = view->next;
 263     else VIRTUAL_FirstView = view->next;
 264     if (view->mapping) CloseHandle( view->mapping );
 265     free( view );
 266 }
 267
 268
 269 /***********************************************************************
 270  *           VIRTUAL_GetUnixProt
 271  *
 272  * Convert page protections to protection for mmap/mprotect.
 273  */
 274 static int VIRTUAL_GetUnixProt( BYTE vprot )
 275 {
 276     int prot = 0;
 277     if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
 278     {
 279         if (vprot & VPROT_READ) prot |= PROT_READ;
 280         if (vprot & VPROT_WRITE) prot |= PROT_WRITE;
 281         if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
 282     }
 283     return prot;
 284 }
 285
 286
 287 /***********************************************************************
 288  *           VIRTUAL_GetWin32Prot
 289  *
 290  * Convert page protections to Win32 flags.
 291  *
 292  * RETURNS
 293  *      None
 294  */
 295 static void VIRTUAL_GetWin32Prot(
 296             BYTE vprot,     /* [in] Page protection flags */
 297             DWORD *protect, /* [out] Location to store Win32 protection flags */
 298             DWORD *state    /* [out] Location to store mem state flag */
 299 ) {
 300     if (protect) {
 301         *protect = VIRTUAL_Win32Flags[vprot & 0x0f];
 302 /*      if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;*/
 303         if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
 304
 305         if (vprot & VPROT_GUARD) *protect = PAGE_NOACCESS;
 306     }
 307
 308     if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
 309 }
 310
 311
 312 /***********************************************************************
 313  *           VIRTUAL_GetProt
 314  *
 315  * Build page protections from Win32 flags.
 316  *
 317  * RETURNS
 318  *      Value of page protection flags
 319  */
 320 static BYTE VIRTUAL_GetProt(
 321             DWORD protect  /* [in] Win32 protection flags */
 322 ) {
 323     BYTE vprot;
 324
 325     switch(protect & 0xff)
 326     {
 327     case PAGE_READONLY:
 328         vprot = VPROT_READ;
 329         break;
 330     case PAGE_READWRITE:
 331         vprot = VPROT_READ | VPROT_WRITE;
 332         break;
 333     case PAGE_WRITECOPY:
 334         vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 335         break;
 336     case PAGE_EXECUTE:
 337         vprot = VPROT_EXEC;
 338         break;
 339     case PAGE_EXECUTE_READ:
 340         vprot = VPROT_EXEC | VPROT_READ;
 341         break;
 342     case PAGE_EXECUTE_READWRITE:
 343         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 344         break;
 345     case PAGE_EXECUTE_WRITECOPY:
 346         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
 347         break;
 348     case PAGE_NOACCESS:
 349     default:
 350         vprot = 0;
 351         break;
 352     }
 353     if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
 354     if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
 355     return vprot;
 356 }
 357
 358
 359 /***********************************************************************
 360  *           VIRTUAL_SetProt
 361  *
 362  * Change the protection of a range of pages.
 363  *
 364  * RETURNS
 365  *      TRUE: Success
 366  *      FALSE: Failure
 367  */
 368 static BOOL VIRTUAL_SetProt(
 369               FILE_VIEW *view, /* [in] Pointer to view */
 370               UINT base,     /* [in] Starting address */
 371               UINT size,     /* [in] Size in bytes */
 372               BYTE vprot       /* [in] Protections to use */
 373 ) {
 374     TRACE("%08x-%08x %s\n",
 375                      base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
 376
 377     if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
 378         return FALSE;  /* FIXME: last error */
 379
 380     memset( view->prot + ((base - view->base) >> page_shift),
 381             vprot, size >> page_shift );
 382     VIRTUAL_DEBUG_DUMP_VIEW( view );
 383     return TRUE;
 384 }
 385
 386
 387 /***********************************************************************
 388  *             VIRTUAL_CheckFlags
 389  *
 390  * Check that all pages in a range have the given flags.
 391  *
 392  * RETURNS
 393  *      TRUE: They do
 394  *      FALSE: They do not
 395  */
 396 static BOOL VIRTUAL_CheckFlags(
 397               UINT base, /* [in] Starting address */
 398               UINT size, /* [in] Size in bytes */
 399               BYTE flags   /* [in] Flags to check for */
 400 ) {
 401     FILE_VIEW *view;
 402     UINT page;
 403
 404     if (!size) return TRUE;
 405     if (!(view = VIRTUAL_FindView( base ))) return FALSE;
 406     if (view->base + view->size < base + size) return FALSE;
 407     page = (base - view->base) >> page_shift;
 408     size = ROUND_SIZE( base, size ) >> page_shift;
 409     while (size--) if ((view->prot[page++] & flags) != flags) return FALSE;
 410     return TRUE;
 411 }
 412
 413
 414 /***********************************************************************
 415  *           VIRTUAL_Init
 416  */
 417 BOOL VIRTUAL_Init(void)
 418 {
 419 #ifndef __i386__
 420     DWORD page_size;
 421
 422 # ifdef HAVE_GETPAGESIZE
 423     page_size = getpagesize();
 424 # else
 425 #  ifdef __svr4__
 426     page_size = sysconf(_SC_PAGESIZE);
 427 #  else
 428 #   error Cannot get the page size on this platform
 429 #  endif
 430 # endif
 431     page_mask = page_size - 1;
 432     granularity_mask = 0xffff;  /* hard-coded for now */
 433     /* Make sure we have a power of 2 */
 434     assert( !(page_size & page_mask) );
 435     page_shift = 0;
 436     while ((1 << page_shift) != page_size) page_shift++;
 437 #endif  /* !__i386__ */
 438
 439 #ifdef linux
 440     {
 441         /* Do not use stdio here since it may temporarily change the size
 442          * of some segments (ie libc6 adds 0x1000 per open FILE)
 443          */
 444         int fd = open ("/proc/self/maps", O_RDONLY);
 445         if (fd >= 0)
 446         {
 447             char buffer[512]; /* line might be rather long in 2.1 */
 448
 449             for (;;)
 450             {
 451                 int start, end, offset;
 452                 char r, w, x, p;
 453                 BYTE vprot = VPROT_COMMITTED;
 454
 455                 char * ptr = buffer;
 456                 int count = sizeof(buffer);
 457                 while (1 == read(fd, ptr, 1) && *ptr != '\n' && --count > 0)
 458                     ptr++;
 459
 460                 if (*ptr != '\n') break;
 461                 *ptr = '\0';
 462
 463                 sscanf( buffer, "%x-%x %c%c%c%c %x",
 464                         &start, &end, &r, &w, &x, &p, &offset );
 465                 if (r == 'r') vprot |= VPROT_READ;
 466                 if (w == 'w') vprot |= VPROT_WRITE;
 467                 if (x == 'x') vprot |= VPROT_EXEC;
 468                 if (p == 'p') vprot |= VPROT_WRITECOPY;
 469                 VIRTUAL_CreateView( start, end - start, 0,
 470                                     VFLAG_SYSTEM, vprot, -1 );
 471             }
 472             close (fd);
 473         }
 474     }
 475 #endif  /* linux */
 476     return TRUE;
 477 }
 478
 479
 480 /***********************************************************************
 481  *           VIRTUAL_GetPageSize
 482  */
 483 DWORD VIRTUAL_GetPageSize(void)
 484 {
 485     return 1 << page_shift;
 486 }
 487
 488
 489 /***********************************************************************
 490  *           VIRTUAL_GetGranularity
 491  */
 492 DWORD VIRTUAL_GetGranularity(void)
 493 {
 494     return granularity_mask + 1;
 495 }
 496
 497
 498 /***********************************************************************
 499  *           VIRTUAL_SetFaultHandler
 500  */
 501 BOOL VIRTUAL_SetFaultHandler( LPCVOID addr, HANDLERPROC proc, LPVOID arg )
 502 {
 503     FILE_VIEW *view;
 504
 505     if (!(view = VIRTUAL_FindView((UINT)addr))) return FALSE;
 506     view->handlerProc = proc;
 507     view->handlerArg  = arg;
 508     return TRUE;
 509 }
 510
 511 /***********************************************************************
 512  *           VIRTUAL_HandleFault
 513  */
 514 BOOL VIRTUAL_HandleFault( LPCVOID addr )
 515 {
 516     FILE_VIEW *view = VIRTUAL_FindView((UINT)addr);
 517
 518     if (view && view->handlerProc)
 519         return view->handlerProc(view->handlerArg, addr);
 520     return FALSE;
 521 }
 522
 523
 524 /***********************************************************************
 525  *             VirtualAlloc   (KERNEL32.548)
 526  * Reserves or commits a region of pages in virtual address space
 527  *
 528  * RETURNS
 529  *      Base address of allocated region of pages
 530  *      NULL: Failure
 531  */
 532 LPVOID WINAPI VirtualAlloc(
 533               LPVOID addr,  /* [in] Address of region to reserve or commit */
 534               DWORD size,   /* [in] Size of region */
 535               DWORD type,   /* [in] Type of allocation */
 536               DWORD protect /* [in] Type of access protection */
 537 ) {
 538     FILE_VIEW *view;
 539     UINT base, ptr, view_size;
 540     BYTE vprot;
 541
 542     TRACE("%08x %08lx %lx %08lx\n",
 543                      (UINT)addr, size, type, protect );
 544
 545     /* Round parameters to a page boundary */
 546
 547     if (size > 0x7fc00000)  /* 2Gb - 4Mb */
 548     {
 549         SetLastError( ERROR_OUTOFMEMORY );
 550         return NULL;
 551     }
 552     if (addr)
 553     {
 554         if (type & MEM_RESERVE) /* Round down to 64k boundary */
 555             base = (UINT)addr & ~granularity_mask;
 556         else
 557             base = ROUND_ADDR( addr );
 558         size = (((UINT)addr + size + page_mask) & ~page_mask) - base;
 559         if ((base <= granularity_mask) || (base + size < base))
 560         {
 561             /* disallow low 64k and wrap-around */
 562             SetLastError( ERROR_INVALID_PARAMETER );
 563             return NULL;
 564         }
 565     }
 566     else
 567     {
 568         base = 0;
 569         size = (size + page_mask) & ~page_mask;
 570     }
 571
 572     if (type & MEM_TOP_DOWN) {
 573         /* FIXME: MEM_TOP_DOWN allocates the largest possible address.
 574          *        Is there _ANY_ way to do it with UNIX mmap()?
 575          */
 576         WARN("MEM_TOP_DOWN ignored\n");
 577         type &= ~MEM_TOP_DOWN;
 578     }
 579     /* Compute the protection flags */
 580
 581     if (!(type & (MEM_COMMIT | MEM_RESERVE)) ||
 582         (type & ~(MEM_COMMIT | MEM_RESERVE)))
 583     {
 584         SetLastError( ERROR_INVALID_PARAMETER );
 585         return NULL;
 586     }
 587     if (type & MEM_COMMIT)
 588         vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
 589     else vprot = 0;
 590
 591     /* Reserve the memory */
 592
 593     if ((type & MEM_RESERVE) || !base)
 594     {
 595         view_size = size + (base ? 0 : granularity_mask + 1);
 596         ptr = (UINT)FILE_dommap( -1, (LPVOID)base, 0, view_size, 0, 0,
 597                                    VIRTUAL_GetUnixProt( vprot ), MAP_PRIVATE );
 598         if (ptr == (UINT)-1)
 599         {
 600             SetLastError( ERROR_OUTOFMEMORY );
 601             return NULL;
 602         }
 603         if (!base)
 604         {
 605             /* Release the extra memory while keeping the range */
 606             /* starting on a 64k boundary. */
 607
 608             if (ptr & granularity_mask)
 609             {
 610                 UINT extra = granularity_mask + 1 - (ptr & granularity_mask);
 611                 FILE_munmap( (void *)ptr, 0, extra );
 612                 ptr += extra;
 613                 view_size -= extra;
 614             }
 615             if (view_size > size)
 616                 FILE_munmap( (void *)(ptr + size), 0, view_size - size );
 617         }
 618         else if (ptr != base)
 619         {
 620             /* We couldn't get the address we wanted */
 621             FILE_munmap( (void *)ptr, 0, view_size );
 622             SetLastError( ERROR_INVALID_ADDRESS );
 623             return NULL;
 624         }
 625         if (!(view = VIRTUAL_CreateView( ptr, size, 0, 0, vprot, -1 )))
 626         {
 627             FILE_munmap( (void *)ptr, 0, size );
 628             SetLastError( ERROR_OUTOFMEMORY );
 629             return NULL;
 630         }
 631         VIRTUAL_DEBUG_DUMP_VIEW( view );
 632         return (LPVOID)ptr;
 633     }
 634
 635     /* Commit the pages */
 636
 637     if (!(view = VIRTUAL_FindView( base )) ||
 638         (base + size > view->base + view->size))
 639     {
 640         SetLastError( ERROR_INVALID_ADDRESS );
 641         return NULL;
 642     }
 643
 644     if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
 645     return (LPVOID)base;
 646 }
 647
 648
 649 /***********************************************************************
 650  *             VirtualFree   (KERNEL32.550)
 651  * Release or decommits a region of pages in virtual address space.
 652  *
 653  * RETURNS
 654  *      TRUE: Success
 655  *      FALSE: Failure
 656  */
 657 BOOL WINAPI VirtualFree(
 658               LPVOID addr, /* [in] Address of region of committed pages */
 659               DWORD size,  /* [in] Size of region */
 660               DWORD type   /* [in] Type of operation */
 661 ) {
 662     FILE_VIEW *view;
 663     UINT base;
 664
 665     TRACE("%08x %08lx %lx\n",
 666                      (UINT)addr, size, type );
 667
 668     /* Fix the parameters */
 669
 670     size = ROUND_SIZE( addr, size );
 671     base = ROUND_ADDR( addr );
 672
 673     if (!(view = VIRTUAL_FindView( base )) ||
 674         (base + size > view->base + view->size))
 675     {
 676         SetLastError( ERROR_INVALID_PARAMETER );
 677         return FALSE;
 678     }
 679
 680     /* Compute the protection flags */
 681
 682     if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
 683     {
 684         SetLastError( ERROR_INVALID_PARAMETER );
 685         return FALSE;
 686     }
 687
 688     /* Free the pages */
 689
 690     if (type == MEM_RELEASE)
 691     {
 692         if (size || (base != view->base))
 693         {
 694             SetLastError( ERROR_INVALID_PARAMETER );
 695             return FALSE;
 696         }
 697         VIRTUAL_DeleteView( view );
 698         return TRUE;
 699     }
 700
 701     /* Decommit the pages by remapping zero-pages instead */
 702
 703     if (FILE_dommap( -1, (LPVOID)base, 0, size, 0, 0,
 704                      VIRTUAL_GetUnixProt( 0 ), MAP_PRIVATE|MAP_FIXED )
 705         != (LPVOID)base)
 706         ERR( "Could not remap pages, expect trouble\n" );
 707     return VIRTUAL_SetProt( view, base, size, 0 );
 708 }
 709
 710
 711 /***********************************************************************
 712  *             VirtualLock   (KERNEL32.551)
 713  * Locks the specified region of virtual address space
 714  *
 715  * NOTE
 716  *      Always returns TRUE
 717  *
 718  * RETURNS
 719  *      TRUE: Success
 720  *      FALSE: Failure
 721  */
 722 BOOL WINAPI VirtualLock(
 723               LPVOID addr, /* [in] Address of first byte of range to lock */
 724               DWORD size   /* [in] Number of bytes in range to lock */
 725 ) {
 726     return TRUE;
 727 }
 728
 729
 730 /***********************************************************************
 731  *             VirtualUnlock   (KERNEL32.556)
 732  * Unlocks a range of pages in the virtual address space
 733  *
 734  * NOTE
 735  *      Always returns TRUE
 736  *
 737  * RETURNS
 738  *      TRUE: Success
 739  *      FALSE: Failure
 740  */
 741 BOOL WINAPI VirtualUnlock(
 742               LPVOID addr, /* [in] Address of first byte of range */
 743               DWORD size   /* [in] Number of bytes in range */
 744 ) {
 745     return TRUE;
 746 }
 747
 748
 749 /***********************************************************************
 750  *             VirtualProtect   (KERNEL32.552)
 751  * Changes the access protection on a region of committed pages
 752  *
 753  * RETURNS
 754  *      TRUE: Success
 755  *      FALSE: Failure
 756  */
 757 BOOL WINAPI VirtualProtect(
 758               LPVOID addr,     /* [in] Address of region of committed pages */
 759               DWORD size,      /* [in] Size of region */
 760               DWORD new_prot,  /* [in] Desired access protection */
 761               LPDWORD old_prot /* [out] Address of variable to get old protection */
 762 ) {
 763     FILE_VIEW *view;
 764     UINT base, i;
 765     BYTE vprot, *p;
 766
 767     TRACE("%08x %08lx %08lx\n",
 768                      (UINT)addr, size, new_prot );
 769
 770     /* Fix the parameters */
 771
 772     size = ROUND_SIZE( addr, size );
 773     base = ROUND_ADDR( addr );
 774
 775     if (!(view = VIRTUAL_FindView( base )) ||
 776         (base + size > view->base + view->size))
 777     {
 778         SetLastError( ERROR_INVALID_PARAMETER );
 779         return FALSE;
 780     }
 781
 782     /* Make sure all the pages are committed */
 783
 784     p = view->prot + ((base - view->base) >> page_shift);
 785     for (i = size >> page_shift; i; i--, p++)
 786     {
 787         if (!(*p & VPROT_COMMITTED))
 788         {
 789             SetLastError( ERROR_INVALID_PARAMETER );
 790             return FALSE;
 791         }
 792     }
 793
 794     VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
 795     vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
 796     return VIRTUAL_SetProt( view, base, size, vprot );
 797 }
 798
 799
 800 /***********************************************************************
 801  *             VirtualProtectEx   (KERNEL32.553)
 802  * Changes the access protection on a region of committed pages in the
 803  * virtual address space of a specified process
 804  *
 805  * RETURNS
 806  *      TRUE: Success
 807  *      FALSE: Failure
 808  */
 809 BOOL WINAPI VirtualProtectEx(
 810               HANDLE handle, /* [in]  Handle of process */
 811               LPVOID addr,     /* [in]  Address of region of committed pages */
 812               DWORD size,      /* [in]  Size of region */
 813               DWORD new_prot,  /* [in]  Desired access protection */
 814               LPDWORD old_prot /* [out] Address of variable to get old protection */ )
 815 {
 816     if (PROCESS_IsCurrent( handle ))
 817         return VirtualProtect( addr, size, new_prot, old_prot );
 818     ERR("Unsupported on other process\n");
 819     return FALSE;
 820 }
 821
 822
 823 /***********************************************************************
 824  *             VirtualQuery   (KERNEL32.554)
 825  * Provides info about a range of pages in virtual address space
 826  *
 827  * RETURNS
 828  *      Number of bytes returned in information buffer
 829  */
 830 DWORD WINAPI VirtualQuery(
 831              LPCVOID addr,                    /* [in]  Address of region */
 832              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 833              DWORD len                        /* [in]  Size of buffer */
 834 ) {
 835     FILE_VIEW *view = VIRTUAL_FirstView;
 836     UINT base = ROUND_ADDR( addr );
 837     UINT alloc_base = 0;
 838     UINT size = 0;
 839
 840     /* Find the view containing the address */
 841
 842     for (;;)
 843     {
 844         if (!view)
 845         {
 846             size = 0xffff0000 - alloc_base;
 847             break;
 848         }
 849         if (view->base > base)
 850         {
 851             size = view->base - alloc_base;
 852             view = NULL;
 853             break;
 854         }
 855         if (view->base + view->size > base)
 856         {
 857             alloc_base = view->base;
 858             size = view->size;
 859             break;
 860         }
 861         alloc_base = view->base + view->size;
 862         view = view->next;
 863     }
 864
 865     /* Fill the info structure */
 866
 867     if (!view)
 868     {
 869         info->State             = MEM_FREE;
 870         info->Protect           = 0;
 871         info->AllocationProtect = 0;
 872         info->Type              = 0;
 873     }
 874     else
 875     {
 876         BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
 877         VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
 878         for (size = base - alloc_base; size < view->size; size += page_mask+1)
 879             if (view->prot[size >> page_shift] != vprot) break;
 880         info->AllocationProtect = view->protect;
 881         info->Type              = MEM_PRIVATE;  /* FIXME */
 882     }
 883
 884     info->BaseAddress    = (LPVOID)base;
 885     info->AllocationBase = (LPVOID)alloc_base;
 886     info->RegionSize     = size - (base - alloc_base);
 887     return sizeof(*info);
 888 }
 889
 890
 891 /***********************************************************************
 892  *             VirtualQueryEx   (KERNEL32.555)
 893  * Provides info about a range of pages in virtual address space of a
 894  * specified process
 895  *
 896  * RETURNS
 897  *      Number of bytes returned in information buffer
 898  */
 899 DWORD WINAPI VirtualQueryEx(
 900              HANDLE handle,                 /* [in] Handle of process */
 901              LPCVOID addr,                    /* [in] Address of region */
 902              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 903              DWORD len                        /* [in] Size of buffer */ )
 904 {
 905     if (PROCESS_IsCurrent( handle ))
 906         return VirtualQuery( addr, info, len );
 907     ERR("Unsupported on other process\n");
 908     return 0;
 909 }
 910
 911
 912 /***********************************************************************
 913  *             IsBadReadPtr32   (KERNEL32.354)
 914  *
 915  * RETURNS
 916  *      FALSE: Process has read access to entire block
 917  *      TRUE: Otherwise
 918  */
 919 BOOL WINAPI IsBadReadPtr(
 920               LPCVOID ptr, /* Address of memory block */
 921               UINT size  /* Size of block */
 922 ) {
 923     return !VIRTUAL_CheckFlags( (UINT)ptr, size,
 924                                 VPROT_READ | VPROT_COMMITTED );
 925 }
 926
 927
 928 /***********************************************************************
 929  *             IsBadWritePtr32   (KERNEL32.357)
 930  *
 931  * RETURNS
 932  *      FALSE: Process has write access to entire block
 933  *      TRUE: Otherwise
 934  */
 935 BOOL WINAPI IsBadWritePtr(
 936               LPVOID ptr, /* [in] Address of memory block */
 937               UINT size /* [in] Size of block in bytes */
 938 ) {
 939     return !VIRTUAL_CheckFlags( (UINT)ptr, size,
 940                                 VPROT_WRITE | VPROT_COMMITTED );
 941 }
 942
 943
 944 /***********************************************************************
 945  *             IsBadHugeReadPtr32   (KERNEL32.352)
 946  * RETURNS
 947  *      FALSE: Process has read access to entire block
 948  *      TRUE: Otherwise
 949  */
 950 BOOL WINAPI IsBadHugeReadPtr(
 951               LPCVOID ptr, /* [in] Address of memory block */
 952               UINT size  /* [in] Size of block */
 953 ) {
 954     return IsBadReadPtr( ptr, size );
 955 }
 956
 957
 958 /***********************************************************************
 959  *             IsBadHugeWritePtr32   (KERNEL32.353)
 960  * RETURNS
 961  *      FALSE: Process has write access to entire block
 962  *      TRUE: Otherwise
 963  */
 964 BOOL WINAPI IsBadHugeWritePtr(
 965               LPVOID ptr, /* [in] Address of memory block */
 966               UINT size /* [in] Size of block */
 967 ) {
 968     return IsBadWritePtr( ptr, size );
 969 }
 970
 971
 972 /***********************************************************************
 973  *             IsBadCodePtr32   (KERNEL32.351)
 974  *
 975  * RETURNS
 976  *      FALSE: Process has read access to specified memory
 977  *      TRUE: Otherwise
 978  */
 979 BOOL WINAPI IsBadCodePtr(
 980               FARPROC ptr /* [in] Address of function */
 981 ) {
 982     return !VIRTUAL_CheckFlags( (UINT)ptr, 1, VPROT_EXEC | VPROT_COMMITTED );
 983 }
 984
 985
 986 /***********************************************************************
 987  *             IsBadStringPtr32A   (KERNEL32.355)
 988  *
 989  * RETURNS
 990  *      FALSE: Read access to all bytes in string
 991  *      TRUE: Else
 992  */
 993 BOOL WINAPI IsBadStringPtrA(
 994               LPCSTR str, /* [in] Address of string */
 995               UINT max  /* [in] Maximum size of string */
 996 ) {
 997     FILE_VIEW *view;
 998     UINT page, count;
 999
1000     if (!max) return FALSE;
1001     if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
1002     page  = ((UINT)str - view->base) >> page_shift;
1003     count = page_mask + 1 - ((UINT)str & page_mask);
1004
1005     while (max)
1006     {
1007         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1008                                                 (VPROT_READ | VPROT_COMMITTED))
1009             return TRUE;
1010         if (count > max) count = max;
1011         max -= count;
1012         while (count--) if (!*str++) return FALSE;
1013         if (++page >= view->size >> page_shift) return TRUE;
1014         count = page_mask + 1;
1015     }
1016     return FALSE;
1017 }
1018
1019
1020 /***********************************************************************
1021  *             IsBadStringPtr32W   (KERNEL32.356)
1022  * See IsBadStringPtr32A
1023  */
1024 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
1025 {
1026     FILE_VIEW *view;
1027     UINT page, count;
1028
1029     if (!max) return FALSE;
1030     if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
1031     page  = ((UINT)str - view->base) >> page_shift;
1032     count = (page_mask + 1 - ((UINT)str & page_mask)) / sizeof(WCHAR);
1033
1034     while (max)
1035     {
1036         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1037                                                 (VPROT_READ | VPROT_COMMITTED))
1038             return TRUE;
1039         if (count > max) count = max;
1040         max -= count;
1041         while (count--) if (!*str++) return FALSE;
1042         if (++page >= view->size >> page_shift) return TRUE;
1043         count = (page_mask + 1) / sizeof(WCHAR);
1044     }
1045     return FALSE;
1046 }
1047
1048
1049 /***********************************************************************
1050  *             CreateFileMapping32A   (KERNEL32.46)
1051  * Creates a named or unnamed file-mapping object for the specified file
1052  *
1053  * RETURNS
1054  *      Handle: Success
1055  *      0: Mapping object does not exist
1056  *      NULL: Failure
1057  */
1058 HANDLE WINAPI CreateFileMappingA(
1059                 HFILE hFile,   /* [in] Handle of file to map */
1060                 SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
1061                 DWORD protect,   /* [in] Protection for mapping object */
1062                 DWORD size_high, /* [in] High-order 32 bits of object size */
1063                 DWORD size_low,  /* [in] Low-order 32 bits of object size */
1064                 LPCSTR name      /* [in] Name of file-mapping object */ )
1065 {
1066     struct create_mapping_request *req = get_req_buffer();
1067     BYTE vprot;
1068
1069     /* Check parameters */
1070
1071     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1072           hFile, sa, protect, size_high, size_low, debugstr_a(name) );
1073
1074     vprot = VIRTUAL_GetProt( protect );
1075     if (protect & SEC_RESERVE)
1076     {
1077         if (hFile != INVALID_HANDLE_VALUE)
1078         {
1079             SetLastError( ERROR_INVALID_PARAMETER );
1080             return 0;
1081         }
1082     }
1083     else vprot |= VPROT_COMMITTED;
1084     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1085
1086     /* Create the server object */
1087
1088     req->file_handle = hFile;
1089     req->size_high   = size_high;
1090     req->size_low    = size_low;
1091     req->protect     = vprot;
1092     req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1093     lstrcpynA( req->name, name ? name : "", server_remaining(req->name) );
1094     SetLastError(0);
1095     server_call( REQ_CREATE_MAPPING );
1096     if (req->handle == -1) return 0;
1097     return req->handle;
1098 }
1099
1100
1101 /***********************************************************************
1102  *             CreateFileMapping32W   (KERNEL32.47)
1103  * See CreateFileMapping32A
1104  */
1105 HANDLE WINAPI CreateFileMappingW( HFILE hFile, LPSECURITY_ATTRIBUTES attr,
1106                                       DWORD protect, DWORD size_high,
1107                                       DWORD size_low, LPCWSTR name )
1108 {
1109     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
1110     HANDLE ret = CreateFileMappingA( hFile, attr, protect,
1111                                          size_high, size_low, nameA );
1112     HeapFree( GetProcessHeap(), 0, nameA );
1113     return ret;
1114 }
1115
1116
1117 /***********************************************************************
1118  *             OpenFileMapping32A   (KERNEL32.397)
1119  * Opens a named file-mapping object.
1120  *
1121  * RETURNS
1122  *      Handle: Success
1123  *      NULL: Failure
1124  */
1125 HANDLE WINAPI OpenFileMappingA(
1126                 DWORD access,   /* [in] Access mode */
1127                 BOOL inherit, /* [in] Inherit flag */
1128                 LPCSTR name )   /* [in] Name of file-mapping object */
1129 {
1130     struct open_mapping_request *req = get_req_buffer();
1131
1132     req->access  = access;
1133     req->inherit = inherit;
1134     lstrcpynA( req->name, name ? name : "", server_remaining(req->name) );
1135     server_call( REQ_OPEN_MAPPING );
1136     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
1137     return req->handle;
1138 }
1139
1140
1141 /***********************************************************************
1142  *             OpenFileMapping32W   (KERNEL32.398)
1143  * See OpenFileMapping32A
1144  */
1145 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
1146 {
1147     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
1148     HANDLE ret = OpenFileMappingA( access, inherit, nameA );
1149     HeapFree( GetProcessHeap(), 0, nameA );
1150     return ret;
1151 }
1152
1153
1154 /***********************************************************************
1155  *             MapViewOfFile   (KERNEL32.385)
1156  * Maps a view of a file into the address space
1157  *
1158  * RETURNS
1159  *      Starting address of mapped view
1160  *      NULL: Failure
1161  */
1162 LPVOID WINAPI MapViewOfFile(
1163               HANDLE mapping,  /* [in] File-mapping object to map */
1164               DWORD access,      /* [in] Access mode */
1165               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1166               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1167               DWORD count        /* [in] Number of bytes to map */
1168 ) {
1169     return MapViewOfFileEx( mapping, access, offset_high,
1170                             offset_low, count, NULL );
1171 }
1172
1173
1174 /***********************************************************************
1175  *             MapViewOfFileEx   (KERNEL32.386)
1176  * Maps a view of a file into the address space
1177  *
1178  * RETURNS
1179  *      Starting address of mapped view
1180  *      NULL: Failure
1181  */
1182 LPVOID WINAPI MapViewOfFileEx(
1183               HANDLE handle,   /* [in] File-mapping object to map */
1184               DWORD access,      /* [in] Access mode */
1185               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1186               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1187               DWORD count,       /* [in] Number of bytes to map */
1188               LPVOID addr        /* [in] Suggested starting address for mapped view */
1189 ) {
1190     FILE_VIEW *view;
1191     UINT ptr = (UINT)-1, size = 0;
1192     int flags = MAP_PRIVATE;
1193     int unix_handle = -1;
1194     int prot;
1195     struct get_mapping_info_request *req = get_req_buffer();
1196
1197     /* Check parameters */
1198
1199     if ((offset_low & granularity_mask) ||
1200         (addr && ((UINT)addr & granularity_mask)))
1201     {
1202         SetLastError( ERROR_INVALID_PARAMETER );
1203         return NULL;
1204     }
1205
1206     req->handle = handle;
1207     if (server_call_fd( REQ_GET_MAPPING_INFO, -1, &unix_handle )) goto error;
1208
1209     if (req->size_high || offset_high)
1210         ERR("Offsets larger than 4Gb not supported\n");
1211
1212     if ((offset_low >= req->size_low) ||
1213         (count > req->size_low - offset_low))
1214     {
1215         SetLastError( ERROR_INVALID_PARAMETER );
1216         goto error;
1217     }
1218     if (count) size = ROUND_SIZE( offset_low, count );
1219     else size = req->size_low - offset_low;
1220     prot = req->protect;
1221
1222     switch(access)
1223     {
1224     case FILE_MAP_ALL_ACCESS:
1225     case FILE_MAP_WRITE:
1226     case FILE_MAP_WRITE | FILE_MAP_READ:
1227         if (!(prot & VPROT_WRITE))
1228         {
1229             SetLastError( ERROR_INVALID_PARAMETER );
1230             goto error;
1231         }
1232         flags = MAP_SHARED;
1233         /* fall through */
1234     case FILE_MAP_READ:
1235     case FILE_MAP_COPY:
1236     case FILE_MAP_COPY | FILE_MAP_READ:
1237         if (prot & VPROT_READ) break;
1238         /* fall through */
1239     default:
1240         SetLastError( ERROR_INVALID_PARAMETER );
1241         goto error;
1242     }
1243
1244     /* Map the file */
1245
1246     TRACE("handle=%x size=%x offset=%lx\n", handle, size, offset_low );
1247
1248     ptr = (UINT)FILE_dommap( unix_handle, addr, 0, size, 0, offset_low,
1249                              VIRTUAL_GetUnixProt( prot ), flags );
1250     if (ptr == (UINT)-1) {
1251         /* KB: Q125713, 25-SEP-1995, "Common File Mapping Problems and
1252          * Platform Differences":
1253          * Windows NT: ERROR_INVALID_PARAMETER
1254          * Windows 95: ERROR_INVALID_ADDRESS.
1255          * FIXME: So should we add a module dependend check here? -MM
1256          */
1257         if (errno==ENOMEM)
1258             SetLastError( ERROR_OUTOFMEMORY );
1259         else
1260             SetLastError( ERROR_INVALID_PARAMETER );
1261         goto error;
1262     }
1263
1264     if (!(view = VIRTUAL_CreateView( ptr, size, offset_low, 0, prot, handle )))
1265     {
1266         SetLastError( ERROR_OUTOFMEMORY );
1267         goto error;
1268     }
1269     if (unix_handle != -1) close( unix_handle );
1270     return (LPVOID)ptr;
1271
1272 error:
1273     if (unix_handle != -1) close( unix_handle );
1274     if (ptr != (UINT)-1) FILE_munmap( (void *)ptr, 0, size );
1275     return NULL;
1276 }
1277
1278
1279 /***********************************************************************
1280  *             FlushViewOfFile   (KERNEL32.262)
1281  * Writes to the disk a byte range within a mapped view of a file
1282  *
1283  * RETURNS
1284  *      TRUE: Success
1285  *      FALSE: Failure
1286  */
1287 BOOL WINAPI FlushViewOfFile(
1288               LPCVOID base, /* [in] Start address of byte range to flush */
1289               DWORD cbFlush /* [in] Number of bytes in range */
1290 ) {
1291     FILE_VIEW *view;
1292     UINT addr = ROUND_ADDR( base );
1293
1294     TRACE("FlushViewOfFile at %p for %ld bytes\n",
1295                      base, cbFlush );
1296
1297     if (!(view = VIRTUAL_FindView( addr )))
1298     {
1299         SetLastError( ERROR_INVALID_PARAMETER );
1300         return FALSE;
1301     }
1302     if (!cbFlush) cbFlush = view->size;
1303     if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
1304     SetLastError( ERROR_INVALID_PARAMETER );
1305     return FALSE;
1306 }
1307
1308
1309 /***********************************************************************
1310  *             UnmapViewOfFile   (KERNEL32.540)
1311  * Unmaps a mapped view of a file.
1312  *
1313  * NOTES
1314  *      Should addr be an LPCVOID?
1315  *
1316  * RETURNS
1317  *      TRUE: Success
1318  *      FALSE: Failure
1319  */
1320 BOOL WINAPI UnmapViewOfFile(
1321               LPVOID addr /* [in] Address where mapped view begins */
1322 ) {
1323     FILE_VIEW *view;
1324     UINT base = ROUND_ADDR( addr );
1325     if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
1326     {
1327         SetLastError( ERROR_INVALID_PARAMETER );
1328         return FALSE;
1329     }
1330     VIRTUAL_DeleteView( view );
1331     return TRUE;
1332 }
1333
1334 /***********************************************************************
1335  *             VIRTUAL_MapFileW
1336  *
1337  * Helper function to map a file to memory:
1338  *  name                        -       file name
1339  *  [RETURN] ptr                -       pointer to mapped file
1340  */
1341 LPVOID VIRTUAL_MapFileW( LPCWSTR name )
1342 {
1343     HANDLE hFile, hMapping;
1344     LPVOID ptr = NULL;
1345
1346     hFile = CreateFileW( name, GENERIC_READ, FILE_SHARE_READ, NULL,
1347                            OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
1348     if (hFile != INVALID_HANDLE_VALUE)
1349     {
1350         hMapping = CreateFileMappingA( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
1351         CloseHandle( hFile );
1352         if (hMapping)
1353         {
1354             ptr = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
1355             CloseHandle( hMapping );
1356         }
1357     }
1358     return ptr;
1359 }