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