memory/virtual.c

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