memory/virtual.c

   1 /*
   2  * Win32 virtual memory functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 #include <assert.h>
  10 #include <errno.h>
  11 #ifdef HAVE_SYS_ERRNO_H
  12 #include <sys/errno.h>
  13 #endif
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <string.h>
  19 #include <sys/types.h>
  20 #ifdef HAVE_SYS_MMAN_H
  21 #include <sys/mman.h>
  22 #endif
  23 #include "winbase.h"
  24 #include "winerror.h"
  25 #include "file.h"
  26 #include "process.h"
  27 #include "global.h"
  28 #include "server.h"
  29 #include "debugtools.h"
  30
  31 DEFAULT_DEBUG_CHANNEL(virtual);
  32
  33 #ifndef MS_SYNC
  34 #define MS_SYNC 0
  35 #endif
  36
  37 /* File view */
  38 typedef struct _FV
  39 {
  40     struct _FV   *next;        /* Next view */
  41     struct _FV   *prev;        /* Prev view */
  42     UINT        base;        /* Base address */
  43     UINT        size;        /* Size in bytes */
  44     UINT        flags;       /* Allocation flags */
  45     UINT        offset;      /* Offset from start of mapped file */
  46     HANDLE      mapping;     /* Handle to the file mapping */
  47     HANDLERPROC   handlerProc; /* Fault handler */
  48     LPVOID        handlerArg;  /* Fault handler argument */
  49     BYTE          protect;     /* Protection for all pages at allocation time */
  50     BYTE          prot[1];     /* Protection byte for each page */
  51 } FILE_VIEW;
  52
  53 /* Per-view flags */
  54 #define VFLAG_SYSTEM     0x01
  55
  56 /* Conversion from VPROT_* to Win32 flags */
  57 static const BYTE VIRTUAL_Win32Flags[16] =
  58 {
  59     PAGE_NOACCESS,              /* 0 */
  60     PAGE_READONLY,              /* READ */
  61     PAGE_READWRITE,             /* WRITE */
  62     PAGE_READWRITE,             /* READ | WRITE */
  63     PAGE_EXECUTE,               /* EXEC */
  64     PAGE_EXECUTE_READ,          /* READ | EXEC */
  65     PAGE_EXECUTE_READWRITE,     /* WRITE | EXEC */
  66     PAGE_EXECUTE_READWRITE,     /* READ | WRITE | EXEC */
  67     PAGE_WRITECOPY,             /* WRITECOPY */
  68     PAGE_WRITECOPY,             /* READ | WRITECOPY */
  69     PAGE_WRITECOPY,             /* WRITE | WRITECOPY */
  70     PAGE_WRITECOPY,             /* READ | WRITE | WRITECOPY */
  71     PAGE_EXECUTE_WRITECOPY,     /* EXEC | WRITECOPY */
  72     PAGE_EXECUTE_WRITECOPY,     /* READ | EXEC | WRITECOPY */
  73     PAGE_EXECUTE_WRITECOPY,     /* WRITE | EXEC | WRITECOPY */
  74     PAGE_EXECUTE_WRITECOPY      /* READ | WRITE | EXEC | WRITECOPY */
  75 };
  76
  77
  78 static FILE_VIEW *VIRTUAL_FirstView;
  79
  80 #ifdef __i386__
  81 /* These are always the same on an i386, and it will be faster this way */
  82 # define page_mask  0xfff
  83 # define page_shift 12
  84 # define granularity_mask 0xffff
  85 #else
  86 static UINT page_shift;
  87 static UINT page_mask;
  88 static UINT granularity_mask;  /* Allocation granularity (usually 64k) */
  89 #endif  /* __i386__ */
  90
  91 #define ROUND_ADDR(addr) \
  92    ((UINT)(addr) & ~page_mask)
  93
  94 #define ROUND_SIZE(addr,size) \
  95    (((UINT)(size) + ((UINT)(addr) & page_mask) + page_mask) & ~page_mask)
  96
  97 #define VIRTUAL_DEBUG_DUMP_VIEW(view) \
  98    if (!TRACE_ON(virtual)); else VIRTUAL_DumpView(view)
  99
 100 /***********************************************************************
 101  *           VIRTUAL_GetProtStr
 102  */
 103 static const char *VIRTUAL_GetProtStr( BYTE prot )
 104 {
 105     static char buffer[6];
 106     buffer[0] = (prot & VPROT_COMMITTED) ? 'c' : '-';
 107     buffer[1] = (prot & VPROT_GUARD) ? 'g' : '-';
 108     buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
 109     buffer[3] = (prot & VPROT_WRITE) ?
 110                     ((prot & VPROT_WRITECOPY) ? 'w' : 'W') : '-';
 111     buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
 112     buffer[5] = 0;
 113     return buffer;
 114 }
 115
 116
 117 /***********************************************************************
 118  *           VIRTUAL_DumpView
 119  */
 120 static void VIRTUAL_DumpView( FILE_VIEW *view )
 121 {
 122     UINT i, count;
 123     UINT addr = view->base;
 124     BYTE prot = view->prot[0];
 125
 126     DPRINTF( "View: %08x - %08x%s",
 127           view->base, view->base + view->size - 1,
 128           (view->flags & VFLAG_SYSTEM) ? " (system)" : "" );
 129     if (view->mapping)
 130         DPRINTF( " %d @ %08x\n", view->mapping, view->offset );
 131     else
 132         DPRINTF( " (anonymous)\n");
 133
 134     for (count = i = 1; i < view->size >> page_shift; i++, count++)
 135     {
 136         if (view->prot[i] == prot) continue;
 137         DPRINTF( "      %08x - %08x %s\n",
 138               addr, addr + (count << page_shift) - 1,
 139               VIRTUAL_GetProtStr(prot) );
 140         addr += (count << page_shift);
 141         prot = view->prot[i];
 142         count = 0;
 143     }
 144     if (count)
 145         DPRINTF( "      %08x - %08x %s\n",
 146               addr, addr + (count << page_shift) - 1,
 147               VIRTUAL_GetProtStr(prot) );
 148 }
 149
 150
 151 /***********************************************************************
 152  *           VIRTUAL_Dump
 153  */
 154 void VIRTUAL_Dump(void)
 155 {
 156     FILE_VIEW *view = VIRTUAL_FirstView;
 157     DPRINTF( "\nDump of all virtual memory views:\n\n" );
 158     while (view)
 159     {
 160         VIRTUAL_DumpView( view );
 161         view = view->next;
 162     }
 163 }
 164
 165
 166 /***********************************************************************
 167  *           VIRTUAL_FindView
 168  *
 169  * Find the view containing a given address.
 170  *
 171  * RETURNS
 172  *      View: Success
 173  *      NULL: Failure
 174  */
 175 static FILE_VIEW *VIRTUAL_FindView(
 176                   UINT addr /* [in] Address */
 177 ) {
 178     FILE_VIEW *view = VIRTUAL_FirstView;
 179     while (view)
 180     {
 181         if (view->base > addr) return NULL;
 182         if (view->base + view->size > addr) return view;
 183         view = view->next;
 184     }
 185     return NULL;
 186 }
 187
 188
 189 /***********************************************************************
 190  *           VIRTUAL_CreateView
 191  *
 192  * Create a new view and add it in the linked list.
 193  */
 194 static FILE_VIEW *VIRTUAL_CreateView( UINT base, UINT size, UINT offset,
 195                                       UINT flags, BYTE vprot,
 196                                       HANDLE mapping )
 197 {
 198     FILE_VIEW *view, *prev;
 199
 200     /* Create the view structure */
 201
 202     assert( !(base & page_mask) );
 203     assert( !(size & page_mask) );
 204     size >>= page_shift;
 205     if (!(view = (FILE_VIEW *)malloc( sizeof(*view) + size - 1 ))) return NULL;
 206     view->base    = base;
 207     view->size    = size << page_shift;
 208     view->flags   = flags;
 209     view->offset  = offset;
 210     view->mapping = mapping;
 211     view->protect = vprot;
 212     view->handlerProc = NULL;
 213     memset( view->prot, vprot, size );
 214
 215     /* Duplicate the mapping handle */
 216
 217     if ((view->mapping != -1) &&
 218         !DuplicateHandle( GetCurrentProcess(), view->mapping,
 219                           GetCurrentProcess(), &view->mapping,
 220                           0, FALSE, DUPLICATE_SAME_ACCESS ))
 221     {
 222         free( view );
 223         return NULL;
 224     }
 225
 226     /* Insert it in the linked list */
 227
 228     if (!VIRTUAL_FirstView || (VIRTUAL_FirstView->base > base))
 229     {
 230         view->next = VIRTUAL_FirstView;
 231         view->prev = NULL;
 232         if (view->next) view->next->prev = view;
 233         VIRTUAL_FirstView = view;
 234     }
 235     else
 236     {
 237         prev = VIRTUAL_FirstView;
 238         while (prev->next && (prev->next->base < base)) prev = prev->next;
 239         view->next = prev->next;
 240         view->prev = prev;
 241         if (view->next) view->next->prev = view;
 242         prev->next  = view;
 243     }
 244     VIRTUAL_DEBUG_DUMP_VIEW( view );
 245     return view;
 246 }
 247
 248
 249 /***********************************************************************
 250  *           VIRTUAL_DeleteView
 251  * Deletes a view.
 252  *
 253  * RETURNS
 254  *      None
 255  */
 256 static void VIRTUAL_DeleteView(
 257             FILE_VIEW *view /* [in] View */
 258 ) {
 259     FILE_munmap( (void *)view->base, 0, view->size );
 260     if (view->next) view->next->prev = view->prev;
 261     if (view->prev) view->prev->next = view->next;
 262     else VIRTUAL_FirstView = view->next;
 263     if (view->mapping) CloseHandle( view->mapping );
 264     free( view );
 265 }
 266
 267
 268 /***********************************************************************
 269  *           VIRTUAL_GetUnixProt
 270  *
 271  * Convert page protections to protection for mmap/mprotect.
 272  */
 273 static int VIRTUAL_GetUnixProt( BYTE vprot )
 274 {
 275     int prot = 0;
 276     if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
 277     {
 278         if (vprot & VPROT_READ) prot |= PROT_READ;
 279         if (vprot & VPROT_WRITE) prot |= PROT_WRITE;
 280         if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
 281     }
 282     return prot;
 283 }
 284
 285
 286 /***********************************************************************
 287  *           VIRTUAL_GetWin32Prot
 288  *
 289  * Convert page protections to Win32 flags.
 290  *
 291  * RETURNS
 292  *      None
 293  */
 294 static void VIRTUAL_GetWin32Prot(
 295             BYTE vprot,     /* [in] Page protection flags */
 296             DWORD *protect, /* [out] Location to store Win32 protection flags */
 297             DWORD *state    /* [out] Location to store mem state flag */
 298 ) {
 299     if (protect) {
 300         *protect = VIRTUAL_Win32Flags[vprot & 0x0f];
 301 /*      if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;*/
 302         if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
 303
 304         if (vprot & VPROT_GUARD) *protect = PAGE_NOACCESS;
 305     }
 306
 307     if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
 308 }
 309
 310
 311 /***********************************************************************
 312  *           VIRTUAL_GetProt
 313  *
 314  * Build page protections from Win32 flags.
 315  *
 316  * RETURNS
 317  *      Value of page protection flags
 318  */
 319 static BYTE VIRTUAL_GetProt(
 320             DWORD protect  /* [in] Win32 protection flags */
 321 ) {
 322     BYTE vprot;
 323
 324     switch(protect & 0xff)
 325     {
 326     case PAGE_READONLY:
 327         vprot = VPROT_READ;
 328         break;
 329     case PAGE_READWRITE:
 330         vprot = VPROT_READ | VPROT_WRITE;
 331         break;
 332     case PAGE_WRITECOPY:
 333         vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 334         break;
 335     case PAGE_EXECUTE:
 336         vprot = VPROT_EXEC;
 337         break;
 338     case PAGE_EXECUTE_READ:
 339         vprot = VPROT_EXEC | VPROT_READ;
 340         break;
 341     case PAGE_EXECUTE_READWRITE:
 342         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 343         break;
 344     case PAGE_EXECUTE_WRITECOPY:
 345         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
 346         break;
 347     case PAGE_NOACCESS:
 348     default:
 349         vprot = 0;
 350         break;
 351     }
 352     if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
 353     if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
 354     return vprot;
 355 }
 356
 357
 358 /***********************************************************************
 359  *           VIRTUAL_SetProt
 360  *
 361  * Change the protection of a range of pages.
 362  *
 363  * RETURNS
 364  *      TRUE: Success
 365  *      FALSE: Failure
 366  */
 367 static BOOL VIRTUAL_SetProt(
 368               FILE_VIEW *view, /* [in] Pointer to view */
 369               UINT base,     /* [in] Starting address */
 370               UINT size,     /* [in] Size in bytes */
 371               BYTE vprot       /* [in] Protections to use */
 372 ) {
 373     TRACE("%08x-%08x %s\n",
 374                      base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
 375
 376     if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
 377         return FALSE;  /* FIXME: last error */
 378
 379     memset( view->prot + ((base - view->base) >> page_shift),
 380             vprot, size >> page_shift );
 381     VIRTUAL_DEBUG_DUMP_VIEW( view );
 382     return TRUE;
 383 }
 384
 385
 386 /***********************************************************************
 387  *             VIRTUAL_CheckFlags
 388  *
 389  * Check that all pages in a range have the given flags.
 390  *
 391  * RETURNS
 392  *      TRUE: They do
 393  *      FALSE: They do not
 394  */
 395 static BOOL VIRTUAL_CheckFlags(
 396               UINT base, /* [in] Starting address */
 397               UINT size, /* [in] Size in bytes */
 398               BYTE flags   /* [in] Flags to check for */
 399 ) {
 400     FILE_VIEW *view;
 401     UINT page;
 402
 403     if (!size) return TRUE;
 404     if (!(view = VIRTUAL_FindView( base ))) return FALSE;
 405     if (view->base + view->size < base + size) return FALSE;
 406     page = (base - view->base) >> page_shift;
 407     size = ROUND_SIZE( base, size ) >> page_shift;
 408     while (size--) if ((view->prot[page++] & flags) != flags) return FALSE;
 409     return TRUE;
 410 }
 411
 412
 413 /***********************************************************************
 414  *           VIRTUAL_Init
 415  */
 416 BOOL VIRTUAL_Init(void)
 417 {
 418 #ifndef __i386__
 419     DWORD page_size;
 420
 421 # ifdef HAVE_GETPAGESIZE
 422     page_size = getpagesize();
 423 # else
 424 #  ifdef __svr4__
 425     page_size = sysconf(_SC_PAGESIZE);
 426 #  else
 427 #   error Cannot get the page size on this platform
 428 #  endif
 429 # endif
 430     page_mask = page_size - 1;
 431     granularity_mask = 0xffff;  /* hard-coded for now */
 432     /* Make sure we have a power of 2 */
 433     assert( !(page_size & page_mask) );
 434     page_shift = 0;
 435     while ((1 << page_shift) != page_size) page_shift++;
 436 #endif  /* !__i386__ */
 437
 438 #ifdef linux
 439     {
 440         /* Do not use stdio here since it may temporarily change the size
 441          * of some segments (ie libc6 adds 0x1000 per open FILE)
 442          */
 443         int fd = open ("/proc/self/maps", O_RDONLY);
 444         if (fd >= 0)
 445         {
 446             char buffer[512]; /* line might be rather long in 2.1 */
 447
 448             for (;;)
 449             {
 450                 int start, end, offset;
 451                 char r, w, x, p;
 452                 BYTE vprot = VPROT_COMMITTED;
 453
 454                 char * ptr = buffer;
 455                 int count = sizeof(buffer);
 456                 while (1 == read(fd, ptr, 1) && *ptr != '\n' && --count > 0)
 457                     ptr++;
 458
 459                 if (*ptr != '\n') break;
 460                 *ptr = '\0';
 461
 462                 sscanf( buffer, "%x-%x %c%c%c%c %x",
 463                         &start, &end, &r, &w, &x, &p, &offset );
 464                 if (r == 'r') vprot |= VPROT_READ;
 465                 if (w == 'w') vprot |= VPROT_WRITE;
 466                 if (x == 'x') vprot |= VPROT_EXEC;
 467                 if (p == 'p') vprot |= VPROT_WRITECOPY;
 468                 VIRTUAL_CreateView( start, end - start, 0,
 469                                     VFLAG_SYSTEM, vprot, -1 );
 470             }
 471             close (fd);
 472         }
 473     }
 474 #endif  /* linux */
 475     return TRUE;
 476 }
 477
 478
 479 /***********************************************************************
 480  *           VIRTUAL_GetPageSize
 481  */
 482 DWORD VIRTUAL_GetPageSize(void)
 483 {
 484     return 1 << page_shift;
 485 }
 486
 487
 488 /***********************************************************************
 489  *           VIRTUAL_GetGranularity
 490  */
 491 DWORD VIRTUAL_GetGranularity(void)
 492 {
 493     return granularity_mask + 1;
 494 }
 495
 496
 497 /***********************************************************************
 498  *           VIRTUAL_SetFaultHandler
 499  */
 500 BOOL VIRTUAL_SetFaultHandler( LPCVOID addr, HANDLERPROC proc, LPVOID arg )
 501 {
 502     FILE_VIEW *view;
 503
 504     if (!(view = VIRTUAL_FindView((UINT)addr))) return FALSE;
 505     view->handlerProc = proc;
 506     view->handlerArg  = arg;
 507     return TRUE;
 508 }
 509
 510 /***********************************************************************
 511  *           VIRTUAL_HandleFault
 512  */
 513 DWORD VIRTUAL_HandleFault( LPCVOID addr )
 514 {
 515     FILE_VIEW *view = VIRTUAL_FindView((UINT)addr);
 516     DWORD ret = EXCEPTION_ACCESS_VIOLATION;
 517
 518     if (view)
 519     {
 520         if (view->handlerProc)
 521         {
 522             if (view->handlerProc(view->handlerArg, addr)) ret = 0;  /* handled */
 523         }
 524         else
 525         {
 526             BYTE vprot = view->prot[((UINT)addr - view->base) >> page_shift];
 527             UINT page = (UINT)addr & ~page_mask;
 528             char *stack = (char *)NtCurrentTeb()->stack_base + SIGNAL_STACK_SIZE + page_mask + 1;
 529             if (vprot & VPROT_GUARD)
 530             {
 531                 VIRTUAL_SetProt( view, page, page_mask + 1, vprot & ~VPROT_GUARD );
 532                 ret = STATUS_GUARD_PAGE_VIOLATION;
 533             }
 534             /* is it inside the stack guard pages? */
 535             if (((char *)addr >= stack) && ((char *)addr < stack + 2*(page_mask+1)))
 536                 ret = STATUS_STACK_OVERFLOW;
 537         }
 538     }
 539     return ret;
 540 }
 541
 542
 543 /***********************************************************************
 544  *             VirtualAlloc   (KERNEL32.548)
 545  * Reserves or commits a region of pages in virtual address space
 546  *
 547  * RETURNS
 548  *      Base address of allocated region of pages
 549  *      NULL: Failure
 550  */
 551 LPVOID WINAPI VirtualAlloc(
 552               LPVOID addr,  /* [in] Address of region to reserve or commit */
 553               DWORD size,   /* [in] Size of region */
 554               DWORD type,   /* [in] Type of allocation */
 555               DWORD protect /* [in] Type of access protection */
 556 ) {
 557     FILE_VIEW *view;
 558     UINT base, ptr, view_size;
 559     BYTE vprot;
 560
 561     TRACE("%08x %08lx %lx %08lx\n",
 562                      (UINT)addr, size, type, protect );
 563
 564     /* Round parameters to a page boundary */
 565
 566     if (size > 0x7fc00000)  /* 2Gb - 4Mb */
 567     {
 568         SetLastError( ERROR_OUTOFMEMORY );
 569         return NULL;
 570     }
 571     if (addr)
 572     {
 573         if (type & MEM_RESERVE) /* Round down to 64k boundary */
 574             base = (UINT)addr & ~granularity_mask;
 575         else
 576             base = ROUND_ADDR( addr );
 577         size = (((UINT)addr + size + page_mask) & ~page_mask) - base;
 578         if ((base <= granularity_mask) || (base + size < base))
 579         {
 580             /* disallow low 64k and wrap-around */
 581             SetLastError( ERROR_INVALID_PARAMETER );
 582             return NULL;
 583         }
 584     }
 585     else
 586     {
 587         base = 0;
 588         size = (size + page_mask) & ~page_mask;
 589     }
 590
 591     if (type & MEM_TOP_DOWN) {
 592         /* FIXME: MEM_TOP_DOWN allocates the largest possible address.
 593          *        Is there _ANY_ way to do it with UNIX mmap()?
 594          */
 595         WARN("MEM_TOP_DOWN ignored\n");
 596         type &= ~MEM_TOP_DOWN;
 597     }
 598     /* Compute the protection flags */
 599
 600     if (!(type & (MEM_COMMIT | MEM_RESERVE)) ||
 601         (type & ~(MEM_COMMIT | MEM_RESERVE)))
 602     {
 603         SetLastError( ERROR_INVALID_PARAMETER );
 604         return NULL;
 605     }
 606     if (type & MEM_COMMIT)
 607         vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
 608     else vprot = 0;
 609
 610     /* Reserve the memory */
 611
 612     if ((type & MEM_RESERVE) || !base)
 613     {
 614         view_size = size + (base ? 0 : granularity_mask + 1);
 615         ptr = (UINT)FILE_dommap( -1, (LPVOID)base, 0, view_size, 0, 0,
 616                                    VIRTUAL_GetUnixProt( vprot ), MAP_PRIVATE );
 617         if (ptr == (UINT)-1)
 618         {
 619             SetLastError( ERROR_OUTOFMEMORY );
 620             return NULL;
 621         }
 622         if (!base)
 623         {
 624             /* Release the extra memory while keeping the range */
 625             /* starting on a 64k boundary. */
 626
 627             if (ptr & granularity_mask)
 628             {
 629                 UINT extra = granularity_mask + 1 - (ptr & granularity_mask);
 630                 FILE_munmap( (void *)ptr, 0, extra );
 631                 ptr += extra;
 632                 view_size -= extra;
 633             }
 634             if (view_size > size)
 635                 FILE_munmap( (void *)(ptr + size), 0, view_size - size );
 636         }
 637         else if (ptr != base)
 638         {
 639             /* We couldn't get the address we wanted */
 640             FILE_munmap( (void *)ptr, 0, view_size );
 641             SetLastError( ERROR_INVALID_ADDRESS );
 642             return NULL;
 643         }
 644         if (!(view = VIRTUAL_CreateView( ptr, size, 0, 0, vprot, -1 )))
 645         {
 646             FILE_munmap( (void *)ptr, 0, size );
 647             SetLastError( ERROR_OUTOFMEMORY );
 648             return NULL;
 649         }
 650         VIRTUAL_DEBUG_DUMP_VIEW( view );
 651         return (LPVOID)ptr;
 652     }
 653
 654     /* Commit the pages */
 655
 656     if (!(view = VIRTUAL_FindView( base )) ||
 657         (base + size > view->base + view->size))
 658     {
 659         SetLastError( ERROR_INVALID_ADDRESS );
 660         return NULL;
 661     }
 662
 663     if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
 664     return (LPVOID)base;
 665 }
 666
 667
 668 /***********************************************************************
 669  *             VirtualFree   (KERNEL32.550)
 670  * Release or decommits a region of pages in virtual address space.
 671  *
 672  * RETURNS
 673  *      TRUE: Success
 674  *      FALSE: Failure
 675  */
 676 BOOL WINAPI VirtualFree(
 677               LPVOID addr, /* [in] Address of region of committed pages */
 678               DWORD size,  /* [in] Size of region */
 679               DWORD type   /* [in] Type of operation */
 680 ) {
 681     FILE_VIEW *view;
 682     UINT base;
 683
 684     TRACE("%08x %08lx %lx\n",
 685                      (UINT)addr, size, type );
 686
 687     /* Fix the parameters */
 688
 689     size = ROUND_SIZE( addr, size );
 690     base = ROUND_ADDR( addr );
 691
 692     if (!(view = VIRTUAL_FindView( base )) ||
 693         (base + size > view->base + view->size))
 694     {
 695         SetLastError( ERROR_INVALID_PARAMETER );
 696         return FALSE;
 697     }
 698
 699     /* Compute the protection flags */
 700
 701     if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
 702     {
 703         SetLastError( ERROR_INVALID_PARAMETER );
 704         return FALSE;
 705     }
 706
 707     /* Free the pages */
 708
 709     if (type == MEM_RELEASE)
 710     {
 711         if (size || (base != view->base))
 712         {
 713             SetLastError( ERROR_INVALID_PARAMETER );
 714             return FALSE;
 715         }
 716         VIRTUAL_DeleteView( view );
 717         return TRUE;
 718     }
 719
 720     /* Decommit the pages by remapping zero-pages instead */
 721
 722     if (FILE_dommap( -1, (LPVOID)base, 0, size, 0, 0,
 723                      VIRTUAL_GetUnixProt( 0 ), MAP_PRIVATE|MAP_FIXED )
 724         != (LPVOID)base)
 725         ERR( "Could not remap pages, expect trouble\n" );
 726     return VIRTUAL_SetProt( view, base, size, 0 );
 727 }
 728
 729
 730 /***********************************************************************
 731  *             VirtualLock   (KERNEL32.551)
 732  * Locks the specified region of virtual address space
 733  *
 734  * NOTE
 735  *      Always returns TRUE
 736  *
 737  * RETURNS
 738  *      TRUE: Success
 739  *      FALSE: Failure
 740  */
 741 BOOL WINAPI VirtualLock(
 742               LPVOID addr, /* [in] Address of first byte of range to lock */
 743               DWORD size   /* [in] Number of bytes in range to lock */
 744 ) {
 745     return TRUE;
 746 }
 747
 748
 749 /***********************************************************************
 750  *             VirtualUnlock   (KERNEL32.556)
 751  * Unlocks a range of pages in the virtual address space
 752  *
 753  * NOTE
 754  *      Always returns TRUE
 755  *
 756  * RETURNS
 757  *      TRUE: Success
 758  *      FALSE: Failure
 759  */
 760 BOOL WINAPI VirtualUnlock(
 761               LPVOID addr, /* [in] Address of first byte of range */
 762               DWORD size   /* [in] Number of bytes in range */
 763 ) {
 764     return TRUE;
 765 }
 766
 767
 768 /***********************************************************************
 769  *             VirtualProtect   (KERNEL32.552)
 770  * Changes the access protection on a region of committed pages
 771  *
 772  * RETURNS
 773  *      TRUE: Success
 774  *      FALSE: Failure
 775  */
 776 BOOL WINAPI VirtualProtect(
 777               LPVOID addr,     /* [in] Address of region of committed pages */
 778               DWORD size,      /* [in] Size of region */
 779               DWORD new_prot,  /* [in] Desired access protection */
 780               LPDWORD old_prot /* [out] Address of variable to get old protection */
 781 ) {
 782     FILE_VIEW *view;
 783     UINT base, i;
 784     BYTE vprot, *p;
 785
 786     TRACE("%08x %08lx %08lx\n",
 787                      (UINT)addr, size, new_prot );
 788
 789     /* Fix the parameters */
 790
 791     size = ROUND_SIZE( addr, size );
 792     base = ROUND_ADDR( addr );
 793
 794     if (!(view = VIRTUAL_FindView( base )) ||
 795         (base + size > view->base + view->size))
 796     {
 797         SetLastError( ERROR_INVALID_PARAMETER );
 798         return FALSE;
 799     }
 800
 801     /* Make sure all the pages are committed */
 802
 803     p = view->prot + ((base - view->base) >> page_shift);
 804     for (i = size >> page_shift; i; i--, p++)
 805     {
 806         if (!(*p & VPROT_COMMITTED))
 807         {
 808             SetLastError( ERROR_INVALID_PARAMETER );
 809             return FALSE;
 810         }
 811     }
 812
 813     VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
 814     vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
 815     return VIRTUAL_SetProt( view, base, size, vprot );
 816 }
 817
 818
 819 /***********************************************************************
 820  *             VirtualProtectEx   (KERNEL32.553)
 821  * Changes the access protection on a region of committed pages in the
 822  * virtual address space of a specified process
 823  *
 824  * RETURNS
 825  *      TRUE: Success
 826  *      FALSE: Failure
 827  */
 828 BOOL WINAPI VirtualProtectEx(
 829               HANDLE handle, /* [in]  Handle of process */
 830               LPVOID addr,     /* [in]  Address of region of committed pages */
 831               DWORD size,      /* [in]  Size of region */
 832               DWORD new_prot,  /* [in]  Desired access protection */
 833               LPDWORD old_prot /* [out] Address of variable to get old protection */ )
 834 {
 835     if (MapProcessHandle( handle ) == GetCurrentProcessId())
 836         return VirtualProtect( addr, size, new_prot, old_prot );
 837     ERR("Unsupported on other process\n");
 838     return FALSE;
 839 }
 840
 841
 842 /***********************************************************************
 843  *             VirtualQuery   (KERNEL32.554)
 844  * Provides info about a range of pages in virtual address space
 845  *
 846  * RETURNS
 847  *      Number of bytes returned in information buffer
 848  */
 849 DWORD WINAPI VirtualQuery(
 850              LPCVOID addr,                    /* [in]  Address of region */
 851              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 852              DWORD len                        /* [in]  Size of buffer */
 853 ) {
 854     FILE_VIEW *view = VIRTUAL_FirstView;
 855     UINT base = ROUND_ADDR( addr );
 856     UINT alloc_base = 0;
 857     UINT size = 0;
 858
 859     /* Find the view containing the address */
 860
 861     for (;;)
 862     {
 863         if (!view)
 864         {
 865             size = 0xffff0000 - alloc_base;
 866             break;
 867         }
 868         if (view->base > base)
 869         {
 870             size = view->base - alloc_base;
 871             view = NULL;
 872             break;
 873         }
 874         if (view->base + view->size > base)
 875         {
 876             alloc_base = view->base;
 877             size = view->size;
 878             break;
 879         }
 880         alloc_base = view->base + view->size;
 881         view = view->next;
 882     }
 883
 884     /* Fill the info structure */
 885
 886     if (!view)
 887     {
 888         info->State             = MEM_FREE;
 889         info->Protect           = 0;
 890         info->AllocationProtect = 0;
 891         info->Type              = 0;
 892     }
 893     else
 894     {
 895         BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
 896         VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
 897         for (size = base - alloc_base; size < view->size; size += page_mask+1)
 898             if (view->prot[size >> page_shift] != vprot) break;
 899         info->AllocationProtect = view->protect;
 900         info->Type              = MEM_PRIVATE;  /* FIXME */
 901     }
 902
 903     info->BaseAddress    = (LPVOID)base;
 904     info->AllocationBase = (LPVOID)alloc_base;
 905     info->RegionSize     = size - (base - alloc_base);
 906     return sizeof(*info);
 907 }
 908
 909
 910 /***********************************************************************
 911  *             VirtualQueryEx   (KERNEL32.555)
 912  * Provides info about a range of pages in virtual address space of a
 913  * specified process
 914  *
 915  * RETURNS
 916  *      Number of bytes returned in information buffer
 917  */
 918 DWORD WINAPI VirtualQueryEx(
 919              HANDLE handle,                 /* [in] Handle of process */
 920              LPCVOID addr,                    /* [in] Address of region */
 921              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 922              DWORD len                        /* [in] Size of buffer */ )
 923 {
 924     if (MapProcessHandle( handle ) == GetCurrentProcessId())
 925         return VirtualQuery( addr, info, len );
 926     ERR("Unsupported on other process\n");
 927     return 0;
 928 }
 929
 930
 931 /***********************************************************************
 932  *             IsBadReadPtr   (KERNEL32.354)
 933  *
 934  * RETURNS
 935  *      FALSE: Process has read access to entire block
 936  *      TRUE: Otherwise
 937  */
 938 BOOL WINAPI IsBadReadPtr(
 939               LPCVOID ptr, /* Address of memory block */
 940               UINT size  /* Size of block */
 941 ) {
 942     return !VIRTUAL_CheckFlags( (UINT)ptr, size,
 943                                 VPROT_READ | VPROT_COMMITTED );
 944 }
 945
 946
 947 /***********************************************************************
 948  *             IsBadWritePtr   (KERNEL32.357)
 949  *
 950  * RETURNS
 951  *      FALSE: Process has write access to entire block
 952  *      TRUE: Otherwise
 953  */
 954 BOOL WINAPI IsBadWritePtr(
 955               LPVOID ptr, /* [in] Address of memory block */
 956               UINT size /* [in] Size of block in bytes */
 957 ) {
 958     return !VIRTUAL_CheckFlags( (UINT)ptr, size,
 959                                 VPROT_WRITE | VPROT_COMMITTED );
 960 }
 961
 962
 963 /***********************************************************************
 964  *             IsBadHugeReadPtr   (KERNEL32.352)
 965  * RETURNS
 966  *      FALSE: Process has read access to entire block
 967  *      TRUE: Otherwise
 968  */
 969 BOOL WINAPI IsBadHugeReadPtr(
 970               LPCVOID ptr, /* [in] Address of memory block */
 971               UINT size  /* [in] Size of block */
 972 ) {
 973     return IsBadReadPtr( ptr, size );
 974 }
 975
 976
 977 /***********************************************************************
 978  *             IsBadHugeWritePtr   (KERNEL32.353)
 979  * RETURNS
 980  *      FALSE: Process has write access to entire block
 981  *      TRUE: Otherwise
 982  */
 983 BOOL WINAPI IsBadHugeWritePtr(
 984               LPVOID ptr, /* [in] Address of memory block */
 985               UINT size /* [in] Size of block */
 986 ) {
 987     return IsBadWritePtr( ptr, size );
 988 }
 989
 990
 991 /***********************************************************************
 992  *             IsBadCodePtr   (KERNEL32.351)
 993  *
 994  * RETURNS
 995  *      FALSE: Process has read access to specified memory
 996  *      TRUE: Otherwise
 997  */
 998 BOOL WINAPI IsBadCodePtr(
 999               FARPROC ptr /* [in] Address of function */
1000 ) {
1001     return !VIRTUAL_CheckFlags( (UINT)ptr, 1, VPROT_EXEC | VPROT_COMMITTED );
1002 }
1003
1004
1005 /***********************************************************************
1006  *             IsBadStringPtrA   (KERNEL32.355)
1007  *
1008  * RETURNS
1009  *      FALSE: Read access to all bytes in string
1010  *      TRUE: Else
1011  */
1012 BOOL WINAPI IsBadStringPtrA(
1013               LPCSTR str, /* [in] Address of string */
1014               UINT max  /* [in] Maximum size of string */
1015 ) {
1016     FILE_VIEW *view;
1017     UINT page, count;
1018
1019     if (!max) return FALSE;
1020     if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
1021     page  = ((UINT)str - view->base) >> page_shift;
1022     count = page_mask + 1 - ((UINT)str & page_mask);
1023
1024     while (max)
1025     {
1026         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1027                                                 (VPROT_READ | VPROT_COMMITTED))
1028             return TRUE;
1029         if (count > max) count = max;
1030         max -= count;
1031         while (count--) if (!*str++) return FALSE;
1032         if (++page >= view->size >> page_shift) return TRUE;
1033         count = page_mask + 1;
1034     }
1035     return FALSE;
1036 }
1037
1038
1039 /***********************************************************************
1040  *             IsBadStringPtrW   (KERNEL32.356)
1041  * See IsBadStringPtrA
1042  */
1043 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
1044 {
1045     FILE_VIEW *view;
1046     UINT page, count;
1047
1048     if (!max) return FALSE;
1049     if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
1050     page  = ((UINT)str - view->base) >> page_shift;
1051     count = (page_mask + 1 - ((UINT)str & page_mask)) / sizeof(WCHAR);
1052
1053     while (max)
1054     {
1055         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1056                                                 (VPROT_READ | VPROT_COMMITTED))
1057             return TRUE;
1058         if (count > max) count = max;
1059         max -= count;
1060         while (count--) if (!*str++) return FALSE;
1061         if (++page >= view->size >> page_shift) return TRUE;
1062         count = (page_mask + 1) / sizeof(WCHAR);
1063     }
1064     return FALSE;
1065 }
1066
1067
1068 /***********************************************************************
1069  *             CreateFileMappingA   (KERNEL32.46)
1070  * Creates a named or unnamed file-mapping object for the specified file
1071  *
1072  * RETURNS
1073  *      Handle: Success
1074  *      0: Mapping object does not exist
1075  *      NULL: Failure
1076  */
1077 HANDLE WINAPI CreateFileMappingA(
1078                 HFILE hFile,   /* [in] Handle of file to map */
1079                 SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
1080                 DWORD protect,   /* [in] Protection for mapping object */
1081                 DWORD size_high, /* [in] High-order 32 bits of object size */
1082                 DWORD size_low,  /* [in] Low-order 32 bits of object size */
1083                 LPCSTR name      /* [in] Name of file-mapping object */ )
1084 {
1085     struct create_mapping_request *req = get_req_buffer();
1086     BYTE vprot;
1087
1088     /* Check parameters */
1089
1090     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1091           hFile, sa, protect, size_high, size_low, debugstr_a(name) );
1092
1093     vprot = VIRTUAL_GetProt( protect );
1094     if (protect & SEC_RESERVE)
1095     {
1096         if (hFile != INVALID_HANDLE_VALUE)
1097         {
1098             SetLastError( ERROR_INVALID_PARAMETER );
1099             return 0;
1100         }
1101     }
1102     else vprot |= VPROT_COMMITTED;
1103     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1104
1105     /* Create the server object */
1106
1107     req->file_handle = hFile;
1108     req->size_high   = size_high;
1109     req->size_low    = size_low;
1110     req->protect     = vprot;
1111     req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1112     server_strcpyAtoW( req->name, name );
1113     SetLastError(0);
1114     server_call( REQ_CREATE_MAPPING );
1115     if (req->handle == -1) return 0;
1116     return req->handle;
1117 }
1118
1119
1120 /***********************************************************************
1121  *             CreateFileMappingW   (KERNEL32.47)
1122  * See CreateFileMappingA
1123  */
1124 HANDLE WINAPI CreateFileMappingW( HFILE hFile, LPSECURITY_ATTRIBUTES sa,
1125                                   DWORD protect, DWORD size_high,
1126                                   DWORD size_low, LPCWSTR name )
1127 {
1128     struct create_mapping_request *req = get_req_buffer();
1129     BYTE vprot;
1130
1131     /* Check parameters */
1132
1133     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1134           hFile, sa, protect, size_high, size_low, debugstr_w(name) );
1135
1136     vprot = VIRTUAL_GetProt( protect );
1137     if (protect & SEC_RESERVE)
1138     {
1139         if (hFile != INVALID_HANDLE_VALUE)
1140         {
1141             SetLastError( ERROR_INVALID_PARAMETER );
1142             return 0;
1143         }
1144     }
1145     else vprot |= VPROT_COMMITTED;
1146     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1147
1148     /* Create the server object */
1149
1150     req->file_handle = hFile;
1151     req->size_high   = size_high;
1152     req->size_low    = size_low;
1153     req->protect     = vprot;
1154     req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1155     server_strcpyW( req->name, name );
1156     SetLastError(0);
1157     server_call( REQ_CREATE_MAPPING );
1158     if (req->handle == -1) return 0;
1159     return req->handle;
1160 }
1161
1162
1163 /***********************************************************************
1164  *             OpenFileMappingA   (KERNEL32.397)
1165  * Opens a named file-mapping object.
1166  *
1167  * RETURNS
1168  *      Handle: Success
1169  *      NULL: Failure
1170  */
1171 HANDLE WINAPI OpenFileMappingA(
1172                 DWORD access,   /* [in] Access mode */
1173                 BOOL inherit, /* [in] Inherit flag */
1174                 LPCSTR name )   /* [in] Name of file-mapping object */
1175 {
1176     struct open_mapping_request *req = get_req_buffer();
1177
1178     req->access  = access;
1179     req->inherit = inherit;
1180     server_strcpyAtoW( req->name, name );
1181     server_call( REQ_OPEN_MAPPING );
1182     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
1183     return req->handle;
1184 }
1185
1186
1187 /***********************************************************************
1188  *             OpenFileMappingW   (KERNEL32.398)
1189  * See OpenFileMappingA
1190  */
1191 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
1192 {
1193     struct open_mapping_request *req = get_req_buffer();
1194
1195     req->access  = access;
1196     req->inherit = inherit;
1197     server_strcpyW( req->name, name );
1198     server_call( REQ_OPEN_MAPPING );
1199     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
1200     return req->handle;
1201 }
1202
1203
1204 /***********************************************************************
1205  *             MapViewOfFile   (KERNEL32.385)
1206  * Maps a view of a file into the address space
1207  *
1208  * RETURNS
1209  *      Starting address of mapped view
1210  *      NULL: Failure
1211  */
1212 LPVOID WINAPI MapViewOfFile(
1213               HANDLE mapping,  /* [in] File-mapping object to map */
1214               DWORD access,      /* [in] Access mode */
1215               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1216               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1217               DWORD count        /* [in] Number of bytes to map */
1218 ) {
1219     return MapViewOfFileEx( mapping, access, offset_high,
1220                             offset_low, count, NULL );
1221 }
1222
1223
1224 /***********************************************************************
1225  *             MapViewOfFileEx   (KERNEL32.386)
1226  * Maps a view of a file into the address space
1227  *
1228  * RETURNS
1229  *      Starting address of mapped view
1230  *      NULL: Failure
1231  */
1232 LPVOID WINAPI MapViewOfFileEx(
1233               HANDLE handle,   /* [in] File-mapping object to map */
1234               DWORD access,      /* [in] Access mode */
1235               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1236               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1237               DWORD count,       /* [in] Number of bytes to map */
1238               LPVOID addr        /* [in] Suggested starting address for mapped view */
1239 ) {
1240     FILE_VIEW *view;
1241     UINT ptr = (UINT)-1, size = 0;
1242     int flags = MAP_PRIVATE;
1243     int unix_handle = -1;
1244     int prot;
1245     struct get_mapping_info_request *req = get_req_buffer();
1246
1247     /* Check parameters */
1248
1249     if ((offset_low & granularity_mask) ||
1250         (addr && ((UINT)addr & granularity_mask)))
1251     {
1252         SetLastError( ERROR_INVALID_PARAMETER );
1253         return NULL;
1254     }
1255
1256     req->handle = handle;
1257     if (server_call_fd( REQ_GET_MAPPING_INFO, -1, &unix_handle )) goto error;
1258
1259     if (req->size_high || offset_high)
1260         ERR("Offsets larger than 4Gb not supported\n");
1261
1262     if ((offset_low >= req->size_low) ||
1263         (count > req->size_low - offset_low))
1264     {
1265         SetLastError( ERROR_INVALID_PARAMETER );
1266         goto error;
1267     }
1268     if (count) size = ROUND_SIZE( offset_low, count );
1269     else size = req->size_low - offset_low;
1270     prot = req->protect;
1271
1272     switch(access)
1273     {
1274     case FILE_MAP_ALL_ACCESS:
1275     case FILE_MAP_WRITE:
1276     case FILE_MAP_WRITE | FILE_MAP_READ:
1277         if (!(prot & VPROT_WRITE))
1278         {
1279             SetLastError( ERROR_INVALID_PARAMETER );
1280             goto error;
1281         }
1282         flags = MAP_SHARED;
1283         /* fall through */
1284     case FILE_MAP_READ:
1285     case FILE_MAP_COPY:
1286     case FILE_MAP_COPY | FILE_MAP_READ:
1287         if (prot & VPROT_READ) break;
1288         /* fall through */
1289     default:
1290         SetLastError( ERROR_INVALID_PARAMETER );
1291         goto error;
1292     }
1293
1294     /* Map the file */
1295
1296     TRACE("handle=%x size=%x offset=%lx\n", handle, size, offset_low );
1297
1298     ptr = (UINT)FILE_dommap( unix_handle, addr, 0, size, 0, offset_low,
1299                              VIRTUAL_GetUnixProt( prot ), flags );
1300     if (ptr == (UINT)-1) {
1301         /* KB: Q125713, 25-SEP-1995, "Common File Mapping Problems and
1302          * Platform Differences":
1303          * Windows NT: ERROR_INVALID_PARAMETER
1304          * Windows 95: ERROR_INVALID_ADDRESS.
1305          * FIXME: So should we add a module dependend check here? -MM
1306          */
1307         if (errno==ENOMEM)
1308             SetLastError( ERROR_OUTOFMEMORY );
1309         else
1310             SetLastError( ERROR_INVALID_PARAMETER );
1311         goto error;
1312     }
1313
1314     if (!(view = VIRTUAL_CreateView( ptr, size, offset_low, 0, prot, handle )))
1315     {
1316         SetLastError( ERROR_OUTOFMEMORY );
1317         goto error;
1318     }
1319     if (unix_handle != -1) close( unix_handle );
1320     return (LPVOID)ptr;
1321
1322 error:
1323     if (unix_handle != -1) close( unix_handle );
1324     if (ptr != (UINT)-1) FILE_munmap( (void *)ptr, 0, size );
1325     return NULL;
1326 }
1327
1328
1329 /***********************************************************************
1330  *             FlushViewOfFile   (KERNEL32.262)
1331  * Writes to the disk a byte range within a mapped view of a file
1332  *
1333  * RETURNS
1334  *      TRUE: Success
1335  *      FALSE: Failure
1336  */
1337 BOOL WINAPI FlushViewOfFile(
1338               LPCVOID base, /* [in] Start address of byte range to flush */
1339               DWORD cbFlush /* [in] Number of bytes in range */
1340 ) {
1341     FILE_VIEW *view;
1342     UINT addr = ROUND_ADDR( base );
1343
1344     TRACE("FlushViewOfFile at %p for %ld bytes\n",
1345                      base, cbFlush );
1346
1347     if (!(view = VIRTUAL_FindView( addr )))
1348     {
1349         SetLastError( ERROR_INVALID_PARAMETER );
1350         return FALSE;
1351     }
1352     if (!cbFlush) cbFlush = view->size;
1353     if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
1354     SetLastError( ERROR_INVALID_PARAMETER );
1355     return FALSE;
1356 }
1357
1358
1359 /***********************************************************************
1360  *             UnmapViewOfFile   (KERNEL32.540)
1361  * Unmaps a mapped view of a file.
1362  *
1363  * NOTES
1364  *      Should addr be an LPCVOID?
1365  *
1366  * RETURNS
1367  *      TRUE: Success
1368  *      FALSE: Failure
1369  */
1370 BOOL WINAPI UnmapViewOfFile(
1371               LPVOID addr /* [in] Address where mapped view begins */
1372 ) {
1373     FILE_VIEW *view;
1374     UINT base = ROUND_ADDR( addr );
1375     if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
1376     {
1377         SetLastError( ERROR_INVALID_PARAMETER );
1378         return FALSE;
1379     }
1380     VIRTUAL_DeleteView( view );
1381     return TRUE;
1382 }
1383
1384 /***********************************************************************
1385  *             VIRTUAL_MapFileW
1386  *
1387  * Helper function to map a file to memory:
1388  *  name                        -       file name
1389  *  [RETURN] ptr                -       pointer to mapped file
1390  */
1391 LPVOID VIRTUAL_MapFileW( LPCWSTR name )
1392 {
1393     HANDLE hFile, hMapping;
1394     LPVOID ptr = NULL;
1395
1396     hFile = CreateFileW( name, GENERIC_READ, FILE_SHARE_READ, NULL,
1397                            OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
1398     if (hFile != INVALID_HANDLE_VALUE)
1399     {
1400         hMapping = CreateFileMappingA( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
1401         CloseHandle( hFile );
1402         if (hMapping)
1403         {
1404             ptr = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
1405             CloseHandle( hMapping );
1406         }
1407     }
1408     return ptr;
1409 }