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     if (!(view->flags & VFLAG_SYSTEM))
 260         FILE_munmap( (void *)view->base, 0, view->size );
 261     if (view->next) view->next->prev = view->prev;
 262     if (view->prev) view->prev->next = view->next;
 263     else VIRTUAL_FirstView = view->next;
 264     if (view->mapping) CloseHandle( view->mapping );
 265     free( view );
 266 }
 267
 268
 269 /***********************************************************************
 270  *           VIRTUAL_GetUnixProt
 271  *
 272  * Convert page protections to protection for mmap/mprotect.
 273  */
 274 static int VIRTUAL_GetUnixProt( BYTE vprot )
 275 {
 276     int prot = 0;
 277     if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
 278     {
 279         if (vprot & VPROT_READ) prot |= PROT_READ;
 280         if (vprot & VPROT_WRITE) prot |= PROT_WRITE;
 281         if (vprot & VPROT_WRITECOPY) prot |= PROT_WRITE;
 282         if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
 283     }
 284     return prot;
 285 }
 286
 287
 288 /***********************************************************************
 289  *           VIRTUAL_GetWin32Prot
 290  *
 291  * Convert page protections to Win32 flags.
 292  *
 293  * RETURNS
 294  *      None
 295  */
 296 static void VIRTUAL_GetWin32Prot(
 297             BYTE vprot,     /* [in] Page protection flags */
 298             DWORD *protect, /* [out] Location to store Win32 protection flags */
 299             DWORD *state    /* [out] Location to store mem state flag */
 300 ) {
 301     if (protect) {
 302         *protect = VIRTUAL_Win32Flags[vprot & 0x0f];
 303 /*      if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;*/
 304         if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
 305
 306         if (vprot & VPROT_GUARD) *protect = PAGE_NOACCESS;
 307     }
 308
 309     if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
 310 }
 311
 312
 313 /***********************************************************************
 314  *           VIRTUAL_GetProt
 315  *
 316  * Build page protections from Win32 flags.
 317  *
 318  * RETURNS
 319  *      Value of page protection flags
 320  */
 321 static BYTE VIRTUAL_GetProt(
 322             DWORD protect  /* [in] Win32 protection flags */
 323 ) {
 324     BYTE vprot;
 325
 326     switch(protect & 0xff)
 327     {
 328     case PAGE_READONLY:
 329         vprot = VPROT_READ;
 330         break;
 331     case PAGE_READWRITE:
 332         vprot = VPROT_READ | VPROT_WRITE;
 333         break;
 334     case PAGE_WRITECOPY:
 335         vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 336         break;
 337     case PAGE_EXECUTE:
 338         vprot = VPROT_EXEC;
 339         break;
 340     case PAGE_EXECUTE_READ:
 341         vprot = VPROT_EXEC | VPROT_READ;
 342         break;
 343     case PAGE_EXECUTE_READWRITE:
 344         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
 345         break;
 346     case PAGE_EXECUTE_WRITECOPY:
 347         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 348         break;
 349     case PAGE_NOACCESS:
 350     default:
 351         vprot = 0;
 352         break;
 353     }
 354     if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
 355     if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
 356     return vprot;
 357 }
 358
 359
 360 /***********************************************************************
 361  *           VIRTUAL_SetProt
 362  *
 363  * Change the protection of a range of pages.
 364  *
 365  * RETURNS
 366  *      TRUE: Success
 367  *      FALSE: Failure
 368  */
 369 static BOOL VIRTUAL_SetProt(
 370               FILE_VIEW *view, /* [in] Pointer to view */
 371               UINT base,     /* [in] Starting address */
 372               UINT size,     /* [in] Size in bytes */
 373               BYTE vprot       /* [in] Protections to use */
 374 ) {
 375     TRACE("%08x-%08x %s\n",
 376                      base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
 377
 378     if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
 379         return FALSE;  /* FIXME: last error */
 380
 381     memset( view->prot + ((base - view->base) >> page_shift),
 382             vprot, size >> page_shift );
 383     VIRTUAL_DEBUG_DUMP_VIEW( view );
 384     return TRUE;
 385 }
 386
 387
 388 /***********************************************************************
 389  *             VIRTUAL_CheckFlags
 390  *
 391  * Check that all pages in a range have the given flags.
 392  *
 393  * RETURNS
 394  *      TRUE: They do
 395  *      FALSE: They do not
 396  */
 397 static BOOL VIRTUAL_CheckFlags(
 398               UINT base, /* [in] Starting address */
 399               UINT size, /* [in] Size in bytes */
 400               BYTE flags   /* [in] Flags to check for */
 401 ) {
 402     FILE_VIEW *view;
 403     UINT page;
 404
 405     if (!size) return TRUE;
 406     if (!(view = VIRTUAL_FindView( base ))) return FALSE;
 407     if (view->base + view->size < base + size) return FALSE;
 408     page = (base - view->base) >> page_shift;
 409     size = ROUND_SIZE( base, size ) >> page_shift;
 410     while (size--) if ((view->prot[page++] & flags) != flags) return FALSE;
 411     return TRUE;
 412 }
 413
 414
 415 /***********************************************************************
 416  *           VIRTUAL_Init
 417  */
 418 BOOL VIRTUAL_Init(void)
 419 {
 420 #ifndef __i386__
 421     DWORD page_size;
 422
 423 # ifdef HAVE_GETPAGESIZE
 424     page_size = getpagesize();
 425 # else
 426 #  ifdef __svr4__
 427     page_size = sysconf(_SC_PAGESIZE);
 428 #  else
 429 #   error Cannot get the page size on this platform
 430 #  endif
 431 # endif
 432     page_mask = page_size - 1;
 433     granularity_mask = 0xffff;  /* hard-coded for now */
 434     /* Make sure we have a power of 2 */
 435     assert( !(page_size & page_mask) );
 436     page_shift = 0;
 437     while ((1 << page_shift) != page_size) page_shift++;
 438 #endif  /* !__i386__ */
 439
 440 #ifdef linux
 441     {
 442         /* Do not use stdio here since it may temporarily change the size
 443          * of some segments (ie libc6 adds 0x1000 per open FILE)
 444          */
 445         int fd = open ("/proc/self/maps", O_RDONLY);
 446         if (fd >= 0)
 447         {
 448             char buffer[512]; /* line might be rather long in 2.1 */
 449
 450             for (;;)
 451             {
 452                 int start, end, offset;
 453                 char r, w, x, p;
 454                 BYTE vprot = VPROT_COMMITTED;
 455
 456                 char * ptr = buffer;
 457                 int count = sizeof(buffer);
 458                 while (1 == read(fd, ptr, 1) && *ptr != '\n' && --count > 0)
 459                     ptr++;
 460
 461                 if (*ptr != '\n') break;
 462                 *ptr = '\0';
 463
 464                 sscanf( buffer, "%x-%x %c%c%c%c %x",
 465                         &start, &end, &r, &w, &x, &p, &offset );
 466                 if (r == 'r') vprot |= VPROT_READ;
 467                 if (w == 'w') vprot |= VPROT_WRITE;
 468                 if (x == 'x') vprot |= VPROT_EXEC;
 469                 if (p == 'p') vprot |= VPROT_WRITECOPY;
 470                 VIRTUAL_CreateView( start, end - start, 0,
 471                                     VFLAG_SYSTEM, vprot, -1 );
 472             }
 473             close (fd);
 474         }
 475     }
 476 #endif  /* linux */
 477     return TRUE;
 478 }
 479
 480
 481 /***********************************************************************
 482  *           VIRTUAL_GetPageSize
 483  */
 484 DWORD VIRTUAL_GetPageSize(void)
 485 {
 486     return 1 << page_shift;
 487 }
 488
 489
 490 /***********************************************************************
 491  *           VIRTUAL_GetGranularity
 492  */
 493 DWORD VIRTUAL_GetGranularity(void)
 494 {
 495     return granularity_mask + 1;
 496 }
 497
 498
 499 /***********************************************************************
 500  *           VIRTUAL_SetFaultHandler
 501  */
 502 BOOL VIRTUAL_SetFaultHandler( LPCVOID addr, HANDLERPROC proc, LPVOID arg )
 503 {
 504     FILE_VIEW *view;
 505
 506     if (!(view = VIRTUAL_FindView((UINT)addr))) return FALSE;
 507     view->handlerProc = proc;
 508     view->handlerArg  = arg;
 509     return TRUE;
 510 }
 511
 512 /***********************************************************************
 513  *           VIRTUAL_HandleFault
 514  */
 515 DWORD VIRTUAL_HandleFault( LPCVOID addr )
 516 {
 517     FILE_VIEW *view = VIRTUAL_FindView((UINT)addr);
 518     DWORD ret = EXCEPTION_ACCESS_VIOLATION;
 519
 520     if (view)
 521     {
 522         if (view->handlerProc)
 523         {
 524             if (view->handlerProc(view->handlerArg, addr)) ret = 0;  /* handled */
 525         }
 526         else
 527         {
 528             BYTE vprot = view->prot[((UINT)addr - view->base) >> page_shift];
 529             UINT page = (UINT)addr & ~page_mask;
 530             char *stack = (char *)NtCurrentTeb()->stack_base + SIGNAL_STACK_SIZE + page_mask + 1;
 531             if (vprot & VPROT_GUARD)
 532             {
 533                 VIRTUAL_SetProt( view, page, page_mask + 1, vprot & ~VPROT_GUARD );
 534                 ret = STATUS_GUARD_PAGE_VIOLATION;
 535             }
 536             /* is it inside the stack guard pages? */
 537             if (((char *)addr >= stack) && ((char *)addr < stack + 2*(page_mask+1)))
 538                 ret = STATUS_STACK_OVERFLOW;
 539         }
 540     }
 541     return ret;
 542 }
 543
 544
 545 /***********************************************************************
 546  *             VirtualAlloc   (KERNEL32.548)
 547  * Reserves or commits a region of pages in virtual address space
 548  *
 549  * RETURNS
 550  *      Base address of allocated region of pages
 551  *      NULL: Failure
 552  */
 553 LPVOID WINAPI VirtualAlloc(
 554               LPVOID addr,  /* [in] Address of region to reserve or commit */
 555               DWORD size,   /* [in] Size of region */
 556               DWORD type,   /* [in] Type of allocation */
 557               DWORD protect /* [in] Type of access protection */
 558 ) {
 559     FILE_VIEW *view;
 560     UINT base, ptr, view_size;
 561     BYTE vprot;
 562
 563     TRACE("%08x %08lx %lx %08lx\n",
 564                      (UINT)addr, size, type, protect );
 565
 566     /* Round parameters to a page boundary */
 567
 568     if (size > 0x7fc00000)  /* 2Gb - 4Mb */
 569     {
 570         SetLastError( ERROR_OUTOFMEMORY );
 571         return NULL;
 572     }
 573     if (addr)
 574     {
 575         if (type & MEM_RESERVE) /* Round down to 64k boundary */
 576             base = (UINT)addr & ~granularity_mask;
 577         else
 578             base = ROUND_ADDR( addr );
 579         size = (((UINT)addr + size + page_mask) & ~page_mask) - base;
 580         if ((base <= granularity_mask) || (base + size < base))
 581         {
 582             /* disallow low 64k and wrap-around */
 583             SetLastError( ERROR_INVALID_PARAMETER );
 584             return NULL;
 585         }
 586     }
 587     else
 588     {
 589         base = 0;
 590         size = (size + page_mask) & ~page_mask;
 591     }
 592
 593     if (type & MEM_TOP_DOWN) {
 594         /* FIXME: MEM_TOP_DOWN allocates the largest possible address.
 595          *        Is there _ANY_ way to do it with UNIX mmap()?
 596          */
 597         WARN("MEM_TOP_DOWN ignored\n");
 598         type &= ~MEM_TOP_DOWN;
 599     }
 600     /* Compute the protection flags */
 601
 602     if (!(type & (MEM_COMMIT | MEM_RESERVE | MEM_SYSTEM)) ||
 603         (type & ~(MEM_COMMIT | MEM_RESERVE | MEM_SYSTEM)))
 604     {
 605         SetLastError( ERROR_INVALID_PARAMETER );
 606         return NULL;
 607     }
 608     if (type & (MEM_COMMIT | MEM_SYSTEM))
 609         vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
 610     else vprot = 0;
 611
 612     /* Reserve the memory */
 613
 614     if ((type & MEM_RESERVE) || !base)
 615     {
 616         view_size = size + (base ? 0 : granularity_mask + 1);
 617         if (type & MEM_SYSTEM)
 618              ptr = base;
 619         else
 620              ptr = (UINT)FILE_dommap( -1, (LPVOID)base, 0, view_size, 0, 0,
 621                                        VIRTUAL_GetUnixProt( vprot ), MAP_PRIVATE );
 622         if (ptr == (UINT)-1)
 623         {
 624             SetLastError( ERROR_OUTOFMEMORY );
 625             return NULL;
 626         }
 627         if (!base)
 628         {
 629             /* Release the extra memory while keeping the range */
 630             /* starting on a 64k boundary. */
 631
 632             if (ptr & granularity_mask)
 633             {
 634                 UINT extra = granularity_mask + 1 - (ptr & granularity_mask);
 635                 FILE_munmap( (void *)ptr, 0, extra );
 636                 ptr += extra;
 637                 view_size -= extra;
 638             }
 639             if (view_size > size)
 640                 FILE_munmap( (void *)(ptr + size), 0, view_size - size );
 641         }
 642         else if (ptr != base)
 643         {
 644             /* We couldn't get the address we wanted */
 645             FILE_munmap( (void *)ptr, 0, view_size );
 646             SetLastError( ERROR_INVALID_ADDRESS );
 647             return NULL;
 648         }
 649         if (!(view = VIRTUAL_CreateView( ptr, size, 0, (type & MEM_SYSTEM) ?
 650                                          VFLAG_SYSTEM : 0, vprot, -1 )))
 651         {
 652             FILE_munmap( (void *)ptr, 0, size );
 653             SetLastError( ERROR_OUTOFMEMORY );
 654             return NULL;
 655         }
 656         VIRTUAL_DEBUG_DUMP_VIEW( view );
 657         return (LPVOID)ptr;
 658     }
 659
 660     /* Commit the pages */
 661
 662     if (!(view = VIRTUAL_FindView( base )) ||
 663         (base + size > view->base + view->size))
 664     {
 665         SetLastError( ERROR_INVALID_ADDRESS );
 666         return NULL;
 667     }
 668
 669     if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
 670     return (LPVOID)base;
 671 }
 672
 673
 674 /***********************************************************************
 675  *             VirtualFree   (KERNEL32.550)
 676  * Release or decommits a region of pages in virtual address space.
 677  *
 678  * RETURNS
 679  *      TRUE: Success
 680  *      FALSE: Failure
 681  */
 682 BOOL WINAPI VirtualFree(
 683               LPVOID addr, /* [in] Address of region of committed pages */
 684               DWORD size,  /* [in] Size of region */
 685               DWORD type   /* [in] Type of operation */
 686 ) {
 687     FILE_VIEW *view;
 688     UINT base;
 689
 690     TRACE("%08x %08lx %lx\n",
 691                      (UINT)addr, size, type );
 692
 693     /* Fix the parameters */
 694
 695     size = ROUND_SIZE( addr, size );
 696     base = ROUND_ADDR( addr );
 697
 698     if (!(view = VIRTUAL_FindView( base )) ||
 699         (base + size > view->base + view->size))
 700     {
 701         SetLastError( ERROR_INVALID_PARAMETER );
 702         return FALSE;
 703     }
 704
 705     /* Compute the protection flags */
 706
 707     if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
 708     {
 709         SetLastError( ERROR_INVALID_PARAMETER );
 710         return FALSE;
 711     }
 712
 713     /* Free the pages */
 714
 715     if (type == MEM_RELEASE)
 716     {
 717         if (size || (base != view->base))
 718         {
 719             SetLastError( ERROR_INVALID_PARAMETER );
 720             return FALSE;
 721         }
 722         VIRTUAL_DeleteView( view );
 723         return TRUE;
 724     }
 725
 726     /* Decommit the pages by remapping zero-pages instead */
 727
 728     if (FILE_dommap( -1, (LPVOID)base, 0, size, 0, 0,
 729                      VIRTUAL_GetUnixProt( 0 ), MAP_PRIVATE|MAP_FIXED )
 730         != (LPVOID)base)
 731         ERR( "Could not remap pages, expect trouble\n" );
 732     return VIRTUAL_SetProt( view, base, size, 0 );
 733 }
 734
 735
 736 /***********************************************************************
 737  *             VirtualLock   (KERNEL32.551)
 738  * Locks the specified region of virtual address space
 739  *
 740  * NOTE
 741  *      Always returns TRUE
 742  *
 743  * RETURNS
 744  *      TRUE: Success
 745  *      FALSE: Failure
 746  */
 747 BOOL WINAPI VirtualLock(
 748               LPVOID addr, /* [in] Address of first byte of range to lock */
 749               DWORD size   /* [in] Number of bytes in range to lock */
 750 ) {
 751     return TRUE;
 752 }
 753
 754
 755 /***********************************************************************
 756  *             VirtualUnlock   (KERNEL32.556)
 757  * Unlocks a range of pages in the virtual address space
 758  *
 759  * NOTE
 760  *      Always returns TRUE
 761  *
 762  * RETURNS
 763  *      TRUE: Success
 764  *      FALSE: Failure
 765  */
 766 BOOL WINAPI VirtualUnlock(
 767               LPVOID addr, /* [in] Address of first byte of range */
 768               DWORD size   /* [in] Number of bytes in range */
 769 ) {
 770     return TRUE;
 771 }
 772
 773
 774 /***********************************************************************
 775  *             VirtualProtect   (KERNEL32.552)
 776  * Changes the access protection on a region of committed pages
 777  *
 778  * RETURNS
 779  *      TRUE: Success
 780  *      FALSE: Failure
 781  */
 782 BOOL WINAPI VirtualProtect(
 783               LPVOID addr,     /* [in] Address of region of committed pages */
 784               DWORD size,      /* [in] Size of region */
 785               DWORD new_prot,  /* [in] Desired access protection */
 786               LPDWORD old_prot /* [out] Address of variable to get old protection */
 787 ) {
 788     FILE_VIEW *view;
 789     UINT base, i;
 790     BYTE vprot, *p;
 791
 792     TRACE("%08x %08lx %08lx\n",
 793                      (UINT)addr, size, new_prot );
 794
 795     /* Fix the parameters */
 796
 797     size = ROUND_SIZE( addr, size );
 798     base = ROUND_ADDR( addr );
 799
 800     if (!(view = VIRTUAL_FindView( base )) ||
 801         (base + size > view->base + view->size))
 802     {
 803         SetLastError( ERROR_INVALID_PARAMETER );
 804         return FALSE;
 805     }
 806
 807     /* Make sure all the pages are committed */
 808
 809     p = view->prot + ((base - view->base) >> page_shift);
 810     for (i = size >> page_shift; i; i--, p++)
 811     {
 812         if (!(*p & VPROT_COMMITTED))
 813         {
 814             SetLastError( ERROR_INVALID_PARAMETER );
 815             return FALSE;
 816         }
 817     }
 818
 819     VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
 820     vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
 821     return VIRTUAL_SetProt( view, base, size, vprot );
 822 }
 823
 824
 825 /***********************************************************************
 826  *             VirtualProtectEx   (KERNEL32.553)
 827  * Changes the access protection on a region of committed pages in the
 828  * virtual address space of a specified process
 829  *
 830  * RETURNS
 831  *      TRUE: Success
 832  *      FALSE: Failure
 833  */
 834 BOOL WINAPI VirtualProtectEx(
 835               HANDLE handle, /* [in]  Handle of process */
 836               LPVOID addr,     /* [in]  Address of region of committed pages */
 837               DWORD size,      /* [in]  Size of region */
 838               DWORD new_prot,  /* [in]  Desired access protection */
 839               LPDWORD old_prot /* [out] Address of variable to get old protection */ )
 840 {
 841     if (MapProcessHandle( handle ) == GetCurrentProcessId())
 842         return VirtualProtect( addr, size, new_prot, old_prot );
 843     ERR("Unsupported on other process\n");
 844     return FALSE;
 845 }
 846
 847
 848 /***********************************************************************
 849  *             VirtualQuery   (KERNEL32.554)
 850  * Provides info about a range of pages in virtual address space
 851  *
 852  * RETURNS
 853  *      Number of bytes returned in information buffer
 854  */
 855 DWORD WINAPI VirtualQuery(
 856              LPCVOID addr,                    /* [in]  Address of region */
 857              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 858              DWORD len                        /* [in]  Size of buffer */
 859 ) {
 860     FILE_VIEW *view = VIRTUAL_FirstView;
 861     UINT base = ROUND_ADDR( addr );
 862     UINT alloc_base = 0;
 863     UINT size = 0;
 864
 865     /* Find the view containing the address */
 866
 867     for (;;)
 868     {
 869         if (!view)
 870         {
 871             size = 0xffff0000 - alloc_base;
 872             break;
 873         }
 874         if (view->base > base)
 875         {
 876             size = view->base - alloc_base;
 877             view = NULL;
 878             break;
 879         }
 880         if (view->base + view->size > base)
 881         {
 882             alloc_base = view->base;
 883             size = view->size;
 884             break;
 885         }
 886         alloc_base = view->base + view->size;
 887         view = view->next;
 888     }
 889
 890     /* Fill the info structure */
 891
 892     if (!view)
 893     {
 894         info->State             = MEM_FREE;
 895         info->Protect           = 0;
 896         info->AllocationProtect = 0;
 897         info->Type              = 0;
 898     }
 899     else
 900     {
 901         BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
 902         VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
 903         for (size = base - alloc_base; size < view->size; size += page_mask+1)
 904             if (view->prot[size >> page_shift] != vprot) break;
 905         info->AllocationProtect = view->protect;
 906         info->Type              = MEM_PRIVATE;  /* FIXME */
 907     }
 908
 909     info->BaseAddress    = (LPVOID)base;
 910     info->AllocationBase = (LPVOID)alloc_base;
 911     info->RegionSize     = size - (base - alloc_base);
 912     return sizeof(*info);
 913 }
 914
 915
 916 /***********************************************************************
 917  *             VirtualQueryEx   (KERNEL32.555)
 918  * Provides info about a range of pages in virtual address space of a
 919  * specified process
 920  *
 921  * RETURNS
 922  *      Number of bytes returned in information buffer
 923  */
 924 DWORD WINAPI VirtualQueryEx(
 925              HANDLE handle,                 /* [in] Handle of process */
 926              LPCVOID addr,                    /* [in] Address of region */
 927              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 928              DWORD len                        /* [in] Size of buffer */ )
 929 {
 930     if (MapProcessHandle( handle ) == GetCurrentProcessId())
 931         return VirtualQuery( addr, info, len );
 932     ERR("Unsupported on other process\n");
 933     return 0;
 934 }
 935
 936
 937 /***********************************************************************
 938  *             IsBadReadPtr   (KERNEL32.354)
 939  *
 940  * RETURNS
 941  *      FALSE: Process has read access to entire block
 942  *      TRUE: Otherwise
 943  */
 944 BOOL WINAPI IsBadReadPtr(
 945               LPCVOID ptr, /* Address of memory block */
 946               UINT size  /* Size of block */
 947 ) {
 948     return !VIRTUAL_CheckFlags( (UINT)ptr, size,
 949                                 VPROT_READ | VPROT_COMMITTED );
 950 }
 951
 952
 953 /***********************************************************************
 954  *             IsBadWritePtr   (KERNEL32.357)
 955  *
 956  * RETURNS
 957  *      FALSE: Process has write access to entire block
 958  *      TRUE: Otherwise
 959  */
 960 BOOL WINAPI IsBadWritePtr(
 961               LPVOID ptr, /* [in] Address of memory block */
 962               UINT size /* [in] Size of block in bytes */
 963 ) {
 964     return !VIRTUAL_CheckFlags( (UINT)ptr, size,
 965                                 VPROT_WRITE | VPROT_COMMITTED );
 966 }
 967
 968
 969 /***********************************************************************
 970  *             IsBadHugeReadPtr   (KERNEL32.352)
 971  * RETURNS
 972  *      FALSE: Process has read access to entire block
 973  *      TRUE: Otherwise
 974  */
 975 BOOL WINAPI IsBadHugeReadPtr(
 976               LPCVOID ptr, /* [in] Address of memory block */
 977               UINT size  /* [in] Size of block */
 978 ) {
 979     return IsBadReadPtr( ptr, size );
 980 }
 981
 982
 983 /***********************************************************************
 984  *             IsBadHugeWritePtr   (KERNEL32.353)
 985  * RETURNS
 986  *      FALSE: Process has write access to entire block
 987  *      TRUE: Otherwise
 988  */
 989 BOOL WINAPI IsBadHugeWritePtr(
 990               LPVOID ptr, /* [in] Address of memory block */
 991               UINT size /* [in] Size of block */
 992 ) {
 993     return IsBadWritePtr( ptr, size );
 994 }
 995
 996
 997 /***********************************************************************
 998  *             IsBadCodePtr   (KERNEL32.351)
 999  *
1000  * RETURNS
1001  *      FALSE: Process has read access to specified memory
1002  *      TRUE: Otherwise
1003  */
1004 BOOL WINAPI IsBadCodePtr(
1005               FARPROC ptr /* [in] Address of function */
1006 ) {
1007     return !VIRTUAL_CheckFlags( (UINT)ptr, 1, VPROT_EXEC | VPROT_COMMITTED );
1008 }
1009
1010
1011 /***********************************************************************
1012  *             IsBadStringPtrA   (KERNEL32.355)
1013  *
1014  * RETURNS
1015  *      FALSE: Read access to all bytes in string
1016  *      TRUE: Else
1017  */
1018 BOOL WINAPI IsBadStringPtrA(
1019               LPCSTR str, /* [in] Address of string */
1020               UINT max  /* [in] Maximum size of string */
1021 ) {
1022     FILE_VIEW *view;
1023     UINT page, count;
1024
1025     if (!max) return FALSE;
1026     if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
1027     page  = ((UINT)str - view->base) >> page_shift;
1028     count = page_mask + 1 - ((UINT)str & page_mask);
1029
1030     while (max)
1031     {
1032         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1033                                                 (VPROT_READ | VPROT_COMMITTED))
1034             return TRUE;
1035         if (count > max) count = max;
1036         max -= count;
1037         while (count--) if (!*str++) return FALSE;
1038         if (++page >= view->size >> page_shift) return TRUE;
1039         count = page_mask + 1;
1040     }
1041     return FALSE;
1042 }
1043
1044
1045 /***********************************************************************
1046  *             IsBadStringPtrW   (KERNEL32.356)
1047  * See IsBadStringPtrA
1048  */
1049 BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
1050 {
1051     FILE_VIEW *view;
1052     UINT page, count;
1053
1054     if (!max) return FALSE;
1055     if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
1056     page  = ((UINT)str - view->base) >> page_shift;
1057     count = (page_mask + 1 - ((UINT)str & page_mask)) / sizeof(WCHAR);
1058
1059     while (max)
1060     {
1061         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1062                                                 (VPROT_READ | VPROT_COMMITTED))
1063             return TRUE;
1064         if (count > max) count = max;
1065         max -= count;
1066         while (count--) if (!*str++) return FALSE;
1067         if (++page >= view->size >> page_shift) return TRUE;
1068         count = (page_mask + 1) / sizeof(WCHAR);
1069     }
1070     return FALSE;
1071 }
1072
1073
1074 /***********************************************************************
1075  *             CreateFileMappingA   (KERNEL32.46)
1076  * Creates a named or unnamed file-mapping object for the specified file
1077  *
1078  * RETURNS
1079  *      Handle: Success
1080  *      0: Mapping object does not exist
1081  *      NULL: Failure
1082  */
1083 HANDLE WINAPI CreateFileMappingA(
1084                 HFILE hFile,   /* [in] Handle of file to map */
1085                 SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
1086                 DWORD protect,   /* [in] Protection for mapping object */
1087                 DWORD size_high, /* [in] High-order 32 bits of object size */
1088                 DWORD size_low,  /* [in] Low-order 32 bits of object size */
1089                 LPCSTR name      /* [in] Name of file-mapping object */ )
1090 {
1091     struct create_mapping_request *req = get_req_buffer();
1092     BYTE vprot;
1093
1094     /* Check parameters */
1095
1096     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1097           hFile, sa, protect, size_high, size_low, debugstr_a(name) );
1098
1099     vprot = VIRTUAL_GetProt( protect );
1100     if (protect & SEC_RESERVE)
1101     {
1102         if (hFile != INVALID_HANDLE_VALUE)
1103         {
1104             SetLastError( ERROR_INVALID_PARAMETER );
1105             return 0;
1106         }
1107     }
1108     else vprot |= VPROT_COMMITTED;
1109     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1110
1111     /* Create the server object */
1112
1113     req->file_handle = hFile;
1114     req->size_high   = size_high;
1115     req->size_low    = size_low;
1116     req->protect     = vprot;
1117     req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1118     server_strcpyAtoW( req->name, name );
1119     SetLastError(0);
1120     server_call( REQ_CREATE_MAPPING );
1121     if (req->handle == -1) return 0;
1122     return req->handle;
1123 }
1124
1125
1126 /***********************************************************************
1127  *             CreateFileMappingW   (KERNEL32.47)
1128  * See CreateFileMappingA
1129  */
1130 HANDLE WINAPI CreateFileMappingW( HFILE hFile, LPSECURITY_ATTRIBUTES sa,
1131                                   DWORD protect, DWORD size_high,
1132                                   DWORD size_low, LPCWSTR name )
1133 {
1134     struct create_mapping_request *req = get_req_buffer();
1135     BYTE vprot;
1136
1137     /* Check parameters */
1138
1139     TRACE("(%x,%p,%08lx,%08lx%08lx,%s)\n",
1140           hFile, sa, protect, size_high, size_low, debugstr_w(name) );
1141
1142     vprot = VIRTUAL_GetProt( protect );
1143     if (protect & SEC_RESERVE)
1144     {
1145         if (hFile != INVALID_HANDLE_VALUE)
1146         {
1147             SetLastError( ERROR_INVALID_PARAMETER );
1148             return 0;
1149         }
1150     }
1151     else vprot |= VPROT_COMMITTED;
1152     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1153
1154     /* Create the server object */
1155
1156     req->file_handle = hFile;
1157     req->size_high   = size_high;
1158     req->size_low    = size_low;
1159     req->protect     = vprot;
1160     req->inherit     = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1161     server_strcpyW( req->name, name );
1162     SetLastError(0);
1163     server_call( REQ_CREATE_MAPPING );
1164     if (req->handle == -1) return 0;
1165     return req->handle;
1166 }
1167
1168
1169 /***********************************************************************
1170  *             OpenFileMappingA   (KERNEL32.397)
1171  * Opens a named file-mapping object.
1172  *
1173  * RETURNS
1174  *      Handle: Success
1175  *      NULL: Failure
1176  */
1177 HANDLE WINAPI OpenFileMappingA(
1178                 DWORD access,   /* [in] Access mode */
1179                 BOOL inherit, /* [in] Inherit flag */
1180                 LPCSTR name )   /* [in] Name of file-mapping object */
1181 {
1182     struct open_mapping_request *req = get_req_buffer();
1183
1184     req->access  = access;
1185     req->inherit = inherit;
1186     server_strcpyAtoW( req->name, name );
1187     server_call( REQ_OPEN_MAPPING );
1188     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
1189     return req->handle;
1190 }
1191
1192
1193 /***********************************************************************
1194  *             OpenFileMappingW   (KERNEL32.398)
1195  * See OpenFileMappingA
1196  */
1197 HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
1198 {
1199     struct open_mapping_request *req = get_req_buffer();
1200
1201     req->access  = access;
1202     req->inherit = inherit;
1203     server_strcpyW( req->name, name );
1204     server_call( REQ_OPEN_MAPPING );
1205     if (req->handle == -1) return 0; /* must return 0 on failure, not -1 */
1206     return req->handle;
1207 }
1208
1209
1210 /***********************************************************************
1211  *             MapViewOfFile   (KERNEL32.385)
1212  * Maps a view of a file into the address space
1213  *
1214  * RETURNS
1215  *      Starting address of mapped view
1216  *      NULL: Failure
1217  */
1218 LPVOID WINAPI MapViewOfFile(
1219               HANDLE mapping,  /* [in] File-mapping object to map */
1220               DWORD access,      /* [in] Access mode */
1221               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1222               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1223               DWORD count        /* [in] Number of bytes to map */
1224 ) {
1225     return MapViewOfFileEx( mapping, access, offset_high,
1226                             offset_low, count, NULL );
1227 }
1228
1229
1230 /***********************************************************************
1231  *             MapViewOfFileEx   (KERNEL32.386)
1232  * Maps a view of a file into the address space
1233  *
1234  * RETURNS
1235  *      Starting address of mapped view
1236  *      NULL: Failure
1237  */
1238 LPVOID WINAPI MapViewOfFileEx(
1239               HANDLE handle,   /* [in] File-mapping object to map */
1240               DWORD access,      /* [in] Access mode */
1241               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1242               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1243               DWORD count,       /* [in] Number of bytes to map */
1244               LPVOID addr        /* [in] Suggested starting address for mapped view */
1245 ) {
1246     FILE_VIEW *view;
1247     UINT ptr = (UINT)-1, size = 0;
1248     int flags = MAP_PRIVATE;
1249     int unix_handle = -1;
1250     int prot;
1251     struct get_mapping_info_request *req = get_req_buffer();
1252
1253     /* Check parameters */
1254
1255     if ((offset_low & granularity_mask) ||
1256         (addr && ((UINT)addr & granularity_mask)))
1257     {
1258         SetLastError( ERROR_INVALID_PARAMETER );
1259         return NULL;
1260     }
1261
1262     req->handle = handle;
1263     if (server_call_fd( REQ_GET_MAPPING_INFO, -1, &unix_handle )) goto error;
1264
1265     if (req->size_high || offset_high)
1266         ERR("Offsets larger than 4Gb not supported\n");
1267
1268     if ((offset_low >= req->size_low) ||
1269         (count > req->size_low - offset_low))
1270     {
1271         SetLastError( ERROR_INVALID_PARAMETER );
1272         goto error;
1273     }
1274     if (count) size = ROUND_SIZE( offset_low, count );
1275     else size = req->size_low - offset_low;
1276     prot = req->protect;
1277
1278     switch(access)
1279     {
1280     case FILE_MAP_ALL_ACCESS:
1281     case FILE_MAP_WRITE:
1282     case FILE_MAP_WRITE | FILE_MAP_READ:
1283         if (!(prot & VPROT_WRITE))
1284         {
1285             SetLastError( ERROR_INVALID_PARAMETER );
1286             goto error;
1287         }
1288         flags = MAP_SHARED;
1289         /* fall through */
1290     case FILE_MAP_READ:
1291     case FILE_MAP_COPY:
1292     case FILE_MAP_COPY | FILE_MAP_READ:
1293         if (prot & VPROT_READ) break;
1294         /* fall through */
1295     default:
1296         SetLastError( ERROR_INVALID_PARAMETER );
1297         goto error;
1298     }
1299
1300     /* Map the file */
1301
1302     TRACE("handle=%x size=%x offset=%lx\n", handle, size, offset_low );
1303
1304     ptr = (UINT)FILE_dommap( unix_handle, addr, 0, size, 0, offset_low,
1305                              VIRTUAL_GetUnixProt( prot ), flags );
1306     if (ptr == (UINT)-1) {
1307         /* KB: Q125713, 25-SEP-1995, "Common File Mapping Problems and
1308          * Platform Differences":
1309          * Windows NT: ERROR_INVALID_PARAMETER
1310          * Windows 95: ERROR_INVALID_ADDRESS.
1311          * FIXME: So should we add a module dependend check here? -MM
1312          */
1313         if (errno==ENOMEM)
1314             SetLastError( ERROR_OUTOFMEMORY );
1315         else
1316             SetLastError( ERROR_INVALID_PARAMETER );
1317         goto error;
1318     }
1319
1320     if (!(view = VIRTUAL_CreateView( ptr, size, offset_low, 0, prot, handle )))
1321     {
1322         SetLastError( ERROR_OUTOFMEMORY );
1323         goto error;
1324     }
1325     if (unix_handle != -1) close( unix_handle );
1326     return (LPVOID)ptr;
1327
1328 error:
1329     if (unix_handle != -1) close( unix_handle );
1330     if (ptr != (UINT)-1) FILE_munmap( (void *)ptr, 0, size );
1331     return NULL;
1332 }
1333
1334
1335 /***********************************************************************
1336  *             FlushViewOfFile   (KERNEL32.262)
1337  * Writes to the disk a byte range within a mapped view of a file
1338  *
1339  * RETURNS
1340  *      TRUE: Success
1341  *      FALSE: Failure
1342  */
1343 BOOL WINAPI FlushViewOfFile(
1344               LPCVOID base, /* [in] Start address of byte range to flush */
1345               DWORD cbFlush /* [in] Number of bytes in range */
1346 ) {
1347     FILE_VIEW *view;
1348     UINT addr = ROUND_ADDR( base );
1349
1350     TRACE("FlushViewOfFile at %p for %ld bytes\n",
1351                      base, cbFlush );
1352
1353     if (!(view = VIRTUAL_FindView( addr )))
1354     {
1355         SetLastError( ERROR_INVALID_PARAMETER );
1356         return FALSE;
1357     }
1358     if (!cbFlush) cbFlush = view->size;
1359     if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
1360     SetLastError( ERROR_INVALID_PARAMETER );
1361     return FALSE;
1362 }
1363
1364
1365 /***********************************************************************
1366  *             UnmapViewOfFile   (KERNEL32.540)
1367  * Unmaps a mapped view of a file.
1368  *
1369  * NOTES
1370  *      Should addr be an LPCVOID?
1371  *
1372  * RETURNS
1373  *      TRUE: Success
1374  *      FALSE: Failure
1375  */
1376 BOOL WINAPI UnmapViewOfFile(
1377               LPVOID addr /* [in] Address where mapped view begins */
1378 ) {
1379     FILE_VIEW *view;
1380     UINT base = ROUND_ADDR( addr );
1381     if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
1382     {
1383         SetLastError( ERROR_INVALID_PARAMETER );
1384         return FALSE;
1385     }
1386     VIRTUAL_DeleteView( view );
1387     return TRUE;
1388 }
1389
1390 /***********************************************************************
1391  *             VIRTUAL_MapFileW
1392  *
1393  * Helper function to map a file to memory:
1394  *  name                        -       file name
1395  *  [RETURN] ptr                -       pointer to mapped file
1396  */
1397 LPVOID VIRTUAL_MapFileW( LPCWSTR name )
1398 {
1399     HANDLE hFile, hMapping;
1400     LPVOID ptr = NULL;
1401
1402     hFile = CreateFileW( name, GENERIC_READ, FILE_SHARE_READ, NULL,
1403                            OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
1404     if (hFile != INVALID_HANDLE_VALUE)
1405     {
1406         hMapping = CreateFileMappingA( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
1407         CloseHandle( hFile );
1408         if (hMapping)
1409         {
1410             ptr = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
1411             CloseHandle( hMapping );
1412         }
1413     }
1414     return ptr;
1415 }