memory/virtual.c

   1 /*
   2  * Win32 virtual memory functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   5  */
   6
   7 #include <assert.h>
   8 #include <errno.h>
   9 #include <sys/errno.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/types.h>
  15 #include <sys/mman.h>
  16 #include "winbase.h"
  17 #include "winerror.h"
  18 #include "file.h"
  19 #include "heap.h"
  20 #include "process.h"
  21 #include "xmalloc.h"
  22 #include "global.h"
  23 #include "server.h"
  24 #include "debug.h"
  25
  26 #ifndef MS_SYNC
  27 #define MS_SYNC 0
  28 #endif
  29
  30 /* File mapping */
  31 typedef struct
  32 {
  33     K32OBJ        header;
  34     FILE_OBJECT  *file;
  35 } FILE_MAPPING;
  36
  37 /* File view */
  38 typedef struct _FV
  39 {
  40     struct _FV   *next;        /* Next view */
  41     struct _FV   *prev;        /* Prev view */
  42     UINT32        base;        /* Base address */
  43     UINT32        size;        /* Size in bytes */
  44     UINT32        flags;       /* Allocation flags */
  45     UINT32        offset;      /* Offset from start of mapped file */
  46     HANDLE32      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 UINT32 page_shift;
  87 static UINT32 page_mask;
  88 static UINT32 granularity_mask;  /* Allocation granularity (usually 64k) */
  89 #endif  /* __i386__ */
  90
  91 #define ROUND_ADDR(addr) \
  92    ((UINT32)(addr) & ~page_mask)
  93
  94 #define ROUND_SIZE(addr,size) \
  95    (((UINT32)(size) + ((UINT32)(addr) & page_mask) + page_mask) & ~page_mask)
  96
  97 static void VIRTUAL_DestroyMapping( K32OBJ *obj );
  98
  99 const K32OBJ_OPS MEM_MAPPED_FILE_Ops =
 100 {
 101     VIRTUAL_DestroyMapping     /* destroy */
 102 };
 103
 104 #define VIRTUAL_DEBUG_DUMP_VIEW(view) \
 105    if (!TRACE_ON(virtual)); else VIRTUAL_DumpView(view)
 106
 107 /***********************************************************************
 108  *           VIRTUAL_GetProtStr
 109  */
 110 static const char *VIRTUAL_GetProtStr( BYTE prot )
 111 {
 112     static char buffer[6];
 113     buffer[0] = (prot & VPROT_COMMITTED) ? 'c' : '-';
 114     buffer[1] = (prot & VPROT_GUARD) ? 'g' : '-';
 115     buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
 116     buffer[3] = (prot & VPROT_WRITE) ?
 117                     ((prot & VPROT_WRITECOPY) ? 'w' : 'W') : '-';
 118     buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
 119     buffer[5] = 0;
 120     return buffer;
 121 }
 122
 123
 124 /***********************************************************************
 125  *           VIRTUAL_DumpView
 126  */
 127 static void VIRTUAL_DumpView( FILE_VIEW *view )
 128 {
 129     UINT32 i, count;
 130     UINT32 addr = view->base;
 131     BYTE prot = view->prot[0];
 132
 133     DUMP( "View: %08x - %08x%s",
 134           view->base, view->base + view->size - 1,
 135           (view->flags & VFLAG_SYSTEM) ? " (system)" : "" );
 136     if (view->mapping)
 137         DUMP( " %d @ %08x\n", view->mapping, view->offset );
 138     else
 139         DUMP( " (anonymous)\n");
 140
 141     for (count = i = 1; i < view->size >> page_shift; i++, count++)
 142     {
 143         if (view->prot[i] == prot) continue;
 144         DUMP( "      %08x - %08x %s\n",
 145               addr, addr + (count << page_shift) - 1,
 146               VIRTUAL_GetProtStr(prot) );
 147         addr += (count << page_shift);
 148         prot = view->prot[i];
 149         count = 0;
 150     }
 151     if (count)
 152         DUMP( "      %08x - %08x %s\n",
 153               addr, addr + (count << page_shift) - 1,
 154               VIRTUAL_GetProtStr(prot) );
 155 }
 156
 157
 158 /***********************************************************************
 159  *           VIRTUAL_Dump
 160  */
 161 void VIRTUAL_Dump(void)
 162 {
 163     FILE_VIEW *view = VIRTUAL_FirstView;
 164     DUMP( "\nDump of all virtual memory views:\n\n" );
 165     while (view)
 166     {
 167         VIRTUAL_DumpView( view );
 168         view = view->next;
 169     }
 170 }
 171
 172
 173 /***********************************************************************
 174  *           VIRTUAL_FindView
 175  *
 176  * Find the view containing a given address.
 177  *
 178  * RETURNS
 179  *      View: Success
 180  *      NULL: Failure
 181  */
 182 static FILE_VIEW *VIRTUAL_FindView(
 183                   UINT32 addr /* [in] Address */
 184 ) {
 185     FILE_VIEW *view = VIRTUAL_FirstView;
 186     while (view)
 187     {
 188         if (view->base > addr) return NULL;
 189         if (view->base + view->size > addr) return view;
 190         view = view->next;
 191     }
 192     return NULL;
 193 }
 194
 195
 196 /***********************************************************************
 197  *           VIRTUAL_CreateView
 198  *
 199  * Create a new view and add it in the linked list.
 200  */
 201 static FILE_VIEW *VIRTUAL_CreateView( UINT32 base, UINT32 size, UINT32 offset,
 202                                       UINT32 flags, BYTE vprot,
 203                                       HANDLE32 mapping )
 204 {
 205     FILE_VIEW *view, *prev;
 206
 207     /* Create the view structure */
 208
 209     assert( !(base & page_mask) );
 210     assert( !(size & page_mask) );
 211     size >>= page_shift;
 212     if (!(view = (FILE_VIEW *)malloc( sizeof(*view) + size - 1 ))) return NULL;
 213     view->base    = base;
 214     view->size    = size << page_shift;
 215     view->flags   = flags;
 216     view->offset  = offset;
 217     view->mapping = mapping;
 218     view->protect = vprot;
 219     memset( view->prot, vprot, size );
 220
 221     /* Duplicate the mapping handle */
 222
 223     if ((view->mapping != -1) &&
 224         !DuplicateHandle( GetCurrentProcess(), view->mapping,
 225                           GetCurrentProcess(), &view->mapping,
 226                           0, FALSE, DUPLICATE_SAME_ACCESS ))
 227     {
 228         free( view );
 229         return NULL;
 230     }
 231
 232     /* Insert it in the linked list */
 233
 234     if (!VIRTUAL_FirstView || (VIRTUAL_FirstView->base > base))
 235     {
 236         view->next = VIRTUAL_FirstView;
 237         view->prev = NULL;
 238         if (view->next) view->next->prev = view;
 239         VIRTUAL_FirstView = view;
 240     }
 241     else
 242     {
 243         prev = VIRTUAL_FirstView;
 244         while (prev->next && (prev->next->base < base)) prev = prev->next;
 245         view->next = prev->next;
 246         view->prev = prev;
 247         if (view->next) view->next->prev = view;
 248         prev->next  = view;
 249     }
 250     VIRTUAL_DEBUG_DUMP_VIEW( view );
 251     return view;
 252 }
 253
 254
 255 /***********************************************************************
 256  *           VIRTUAL_DeleteView
 257  * Deletes a view.
 258  *
 259  * RETURNS
 260  *      None
 261  */
 262 static void VIRTUAL_DeleteView(
 263             FILE_VIEW *view /* [in] View */
 264 ) {
 265     FILE_munmap( (void *)view->base, 0, view->size );
 266     if (view->next) view->next->prev = view->prev;
 267     if (view->prev) view->prev->next = view->next;
 268     else VIRTUAL_FirstView = view->next;
 269     if (view->mapping) CloseHandle( view->mapping );
 270     free( view );
 271 }
 272
 273
 274 /***********************************************************************
 275  *           VIRTUAL_GetUnixProt
 276  *
 277  * Convert page protections to protection for mmap/mprotect.
 278  */
 279 static int VIRTUAL_GetUnixProt( BYTE vprot )
 280 {
 281     int prot = 0;
 282     if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
 283     {
 284         if (vprot & VPROT_READ) prot |= PROT_READ;
 285         if (vprot & VPROT_WRITE) prot |= PROT_WRITE;
 286         if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
 287     }
 288     return prot;
 289 }
 290
 291
 292 /***********************************************************************
 293  *           VIRTUAL_GetWin32Prot
 294  *
 295  * Convert page protections to Win32 flags.
 296  *
 297  * RETURNS
 298  *      None
 299  */
 300 static void VIRTUAL_GetWin32Prot(
 301             BYTE vprot,     /* [in] Page protection flags */
 302             DWORD *protect, /* [out] Location to store Win32 protection flags */
 303             DWORD *state    /* [out] Location to store mem state flag */
 304 ) {
 305     if (protect) {
 306         *protect = VIRTUAL_Win32Flags[vprot & 0x0f];
 307 /*      if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;*/
 308         if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
 309
 310         if (vprot & VPROT_GUARD) *protect = PAGE_NOACCESS;
 311     }
 312
 313     if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
 314 }
 315
 316
 317 /***********************************************************************
 318  *           VIRTUAL_GetProt
 319  *
 320  * Build page protections from Win32 flags.
 321  *
 322  * RETURNS
 323  *      Value of page protection flags
 324  */
 325 static BYTE VIRTUAL_GetProt(
 326             DWORD protect  /* [in] Win32 protection flags */
 327 ) {
 328     BYTE vprot;
 329
 330     switch(protect & 0xff)
 331     {
 332     case PAGE_READONLY:
 333         vprot = VPROT_READ;
 334         break;
 335     case PAGE_READWRITE:
 336         vprot = VPROT_READ | VPROT_WRITE;
 337         break;
 338     case PAGE_WRITECOPY:
 339         vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 340         break;
 341     case PAGE_EXECUTE:
 342         vprot = VPROT_EXEC;
 343         break;
 344     case PAGE_EXECUTE_READ:
 345         vprot = VPROT_EXEC | VPROT_READ;
 346         break;
 347     case PAGE_EXECUTE_READWRITE:
 348         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
 349         break;
 350     case PAGE_EXECUTE_WRITECOPY:
 351         vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
 352         break;
 353     case PAGE_NOACCESS:
 354     default:
 355         vprot = 0;
 356         break;
 357     }
 358     if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
 359     if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
 360     return vprot;
 361 }
 362
 363
 364 /***********************************************************************
 365  *           VIRTUAL_SetProt
 366  *
 367  * Change the protection of a range of pages.
 368  *
 369  * RETURNS
 370  *      TRUE: Success
 371  *      FALSE: Failure
 372  */
 373 static BOOL32 VIRTUAL_SetProt(
 374               FILE_VIEW *view, /* [in] Pointer to view */
 375               UINT32 base,     /* [in] Starting address */
 376               UINT32 size,     /* [in] Size in bytes */
 377               BYTE vprot       /* [in] Protections to use */
 378 ) {
 379     TRACE(virtual, "%08x-%08x %s\n",
 380                      base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
 381
 382     if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
 383         return FALSE;  /* FIXME: last error */
 384
 385     memset( view->prot + ((base - view->base) >> page_shift),
 386             vprot, size >> page_shift );
 387     VIRTUAL_DEBUG_DUMP_VIEW( view );
 388     return TRUE;
 389 }
 390
 391
 392 /***********************************************************************
 393  *             VIRTUAL_CheckFlags
 394  *
 395  * Check that all pages in a range have the given flags.
 396  *
 397  * RETURNS
 398  *      TRUE: They do
 399  *      FALSE: They do not
 400  */
 401 static BOOL32 VIRTUAL_CheckFlags(
 402               UINT32 base, /* [in] Starting address */
 403               UINT32 size, /* [in] Size in bytes */
 404               BYTE flags   /* [in] Flags to check for */
 405 ) {
 406     FILE_VIEW *view;
 407     UINT32 page;
 408
 409     if (!size) return TRUE;
 410     if (!(view = VIRTUAL_FindView( base ))) return FALSE;
 411     if (view->base + view->size < base + size) return FALSE;
 412     page = (base - view->base) >> page_shift;
 413     size = ROUND_SIZE( base, size ) >> page_shift;
 414     while (size--) if ((view->prot[page++] & flags) != flags) return FALSE;
 415     return TRUE;
 416 }
 417
 418
 419 /***********************************************************************
 420  *           VIRTUAL_Init
 421  */
 422 BOOL32 VIRTUAL_Init(void)
 423 {
 424 #ifndef __i386__
 425     DWORD page_size;
 426
 427 # ifdef HAVE_GETPAGESIZE
 428     page_size = getpagesize();
 429 # else
 430 #  ifdef __svr4__
 431     page_size = sysconf(_SC_PAGESIZE);
 432 #  else
 433 #   error Cannot get the page size on this platform
 434 #  endif
 435 # endif
 436     page_mask = page_size - 1;
 437     granularity_mask = 0xffff;  /* hard-coded for now */
 438     /* Make sure we have a power of 2 */
 439     assert( !(page_size & page_mask) );
 440     page_shift = 0;
 441     while ((1 << page_shift) != page_size) page_shift++;
 442 #endif  /* !__i386__ */
 443
 444 #ifdef linux
 445     {
 446         /* Do not use stdio here since it may temporarily change the size
 447          * of some segments (ie libc6 adds 0x1000 per open FILE)
 448          */
 449         int fd = open ("/proc/self/maps", O_RDONLY);
 450         if (fd >= 0)
 451         {
 452             char buffer[512]; /* line might be rather long in 2.1 */
 453
 454             for (;;)
 455             {
 456                 int start, end, offset;
 457                 char r, w, x, p;
 458                 BYTE vprot = VPROT_COMMITTED;
 459
 460                 char * ptr = buffer;
 461                 int count = sizeof(buffer);
 462                 while (1 == read(fd, ptr, 1) && *ptr != '\n' && --count > 0)
 463                     ptr++;
 464
 465                 if (*ptr != '\n') break;
 466                 *ptr = '\0';
 467
 468                 sscanf( buffer, "%x-%x %c%c%c%c %x",
 469                         &start, &end, &r, &w, &x, &p, &offset );
 470                 if (r == 'r') vprot |= VPROT_READ;
 471                 if (w == 'w') vprot |= VPROT_WRITE;
 472                 if (x == 'x') vprot |= VPROT_EXEC;
 473                 if (p == 'p') vprot |= VPROT_WRITECOPY;
 474                 VIRTUAL_CreateView( start, end - start, 0,
 475                                     VFLAG_SYSTEM, vprot, -1 );
 476             }
 477             close (fd);
 478         }
 479     }
 480 #endif  /* linux */
 481     return TRUE;
 482 }
 483
 484
 485 /***********************************************************************
 486  *           VIRTUAL_GetPageSize
 487  */
 488 DWORD VIRTUAL_GetPageSize(void)
 489 {
 490     return 1 << page_shift;
 491 }
 492
 493
 494 /***********************************************************************
 495  *           VIRTUAL_GetGranularity
 496  */
 497 DWORD VIRTUAL_GetGranularity(void)
 498 {
 499     return granularity_mask + 1;
 500 }
 501
 502
 503 /***********************************************************************
 504  *           VIRTUAL_SetFaultHandler
 505  */
 506 BOOL32 VIRTUAL_SetFaultHandler( LPVOID addr, HANDLERPROC proc, LPVOID arg )
 507 {
 508     FILE_VIEW *view;
 509
 510     if (!(view = VIRTUAL_FindView((UINT32)addr))) return FALSE;
 511     view->handlerProc = proc;
 512     view->handlerArg  = arg;
 513     return TRUE;
 514 }
 515
 516 /***********************************************************************
 517  *           VIRTUAL_HandleFault
 518  */
 519 BOOL32 VIRTUAL_HandleFault(LPVOID addr)
 520 {
 521     FILE_VIEW *view = VIRTUAL_FindView((UINT32)addr);
 522
 523     if (view && view->handlerProc)
 524         return view->handlerProc(view->handlerArg, addr);
 525     return FALSE;
 526 }
 527
 528
 529 /***********************************************************************
 530  *             VirtualAlloc   (KERNEL32.548)
 531  * Reserves or commits a region of pages in virtual address space
 532  *
 533  * RETURNS
 534  *      Base address of allocated region of pages
 535  *      NULL: Failure
 536  */
 537 LPVOID WINAPI VirtualAlloc(
 538               LPVOID addr,  /* [in] Address of region to reserve or commit */
 539               DWORD size,   /* [in] Size of region */
 540               DWORD type,   /* [in] Type of allocation */
 541               DWORD protect /* [in] Type of access protection */
 542 ) {
 543     FILE_VIEW *view;
 544     UINT32 base, ptr, view_size;
 545     BYTE vprot;
 546
 547     TRACE(virtual, "%08x %08lx %lx %08lx\n",
 548                      (UINT32)addr, size, type, protect );
 549
 550     /* Round parameters to a page boundary */
 551
 552     if (size > 0x7fc00000)  /* 2Gb - 4Mb */
 553     {
 554         SetLastError( ERROR_OUTOFMEMORY );
 555         return NULL;
 556     }
 557     if (addr)
 558     {
 559         if (type & MEM_RESERVE) /* Round down to 64k boundary */
 560             base = ((UINT32)addr + granularity_mask) & ~granularity_mask;
 561         else
 562             base = ROUND_ADDR( addr );
 563         size = (((UINT32)addr + size + page_mask) & ~page_mask) - base;
 564         if (base + size < base)  /* Disallow wrap-around */
 565         {
 566             SetLastError( ERROR_INVALID_PARAMETER );
 567             return NULL;
 568         }
 569     }
 570     else
 571     {
 572         base = 0;
 573         size = (size + page_mask) & ~page_mask;
 574     }
 575
 576     if (type & MEM_TOP_DOWN) {
 577         /* FIXME: MEM_TOP_DOWN allocates the largest possible address.
 578          *        Is there _ANY_ way to do it with UNIX mmap()?
 579          */
 580         WARN(virtual,"MEM_TOP_DOWN ignored\n");
 581         type &= ~MEM_TOP_DOWN;
 582     }
 583     /* Compute the protection flags */
 584
 585     if (!(type & (MEM_COMMIT | MEM_RESERVE)) ||
 586         (type & ~(MEM_COMMIT | MEM_RESERVE)))
 587     {
 588         SetLastError( ERROR_INVALID_PARAMETER );
 589         return NULL;
 590     }
 591     if (type & MEM_COMMIT)
 592         vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
 593     else vprot = 0;
 594
 595     /* Reserve the memory */
 596
 597     if ((type & MEM_RESERVE) || !base)
 598     {
 599         view_size = size + (base ? 0 : granularity_mask + 1);
 600         ptr = (UINT32)FILE_dommap( -1, (LPVOID)base, 0, view_size, 0, 0,
 601                                    VIRTUAL_GetUnixProt( vprot ), MAP_PRIVATE );
 602         if (ptr == (UINT32)-1)
 603         {
 604             SetLastError( ERROR_OUTOFMEMORY );
 605             return NULL;
 606         }
 607         if (!base)
 608         {
 609             /* Release the extra memory while keeping the range */
 610             /* starting on a 64k boundary. */
 611
 612             if (ptr & granularity_mask)
 613             {
 614                 UINT32 extra = granularity_mask + 1 - (ptr & granularity_mask);
 615                 FILE_munmap( (void *)ptr, 0, extra );
 616                 ptr += extra;
 617                 view_size -= extra;
 618             }
 619             if (view_size > size)
 620                 FILE_munmap( (void *)(ptr + size), 0, view_size - size );
 621         }
 622         else if (ptr != base)
 623         {
 624             /* We couldn't get the address we wanted */
 625             FILE_munmap( (void *)ptr, 0, view_size );
 626             SetLastError( ERROR_INVALID_ADDRESS );
 627             return NULL;
 628         }
 629         if (!(view = VIRTUAL_CreateView( ptr, size, 0, 0, vprot, -1 )))
 630         {
 631             FILE_munmap( (void *)ptr, 0, size );
 632             SetLastError( ERROR_OUTOFMEMORY );
 633             return NULL;
 634         }
 635         VIRTUAL_DEBUG_DUMP_VIEW( view );
 636         return (LPVOID)ptr;
 637     }
 638
 639     /* Commit the pages */
 640
 641     if (!(view = VIRTUAL_FindView( base )) ||
 642         (base + size > view->base + view->size))
 643     {
 644         SetLastError( ERROR_INVALID_PARAMETER );
 645         return NULL;
 646     }
 647
 648     if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
 649     return (LPVOID)base;
 650 }
 651
 652
 653 /***********************************************************************
 654  *             VirtualFree   (KERNEL32.550)
 655  * Release or decommits a region of pages in virtual address space.
 656  *
 657  * RETURNS
 658  *      TRUE: Success
 659  *      FALSE: Failure
 660  */
 661 BOOL32 WINAPI VirtualFree(
 662               LPVOID addr, /* [in] Address of region of committed pages */
 663               DWORD size,  /* [in] Size of region */
 664               DWORD type   /* [in] Type of operation */
 665 ) {
 666     FILE_VIEW *view;
 667     UINT32 base;
 668
 669     TRACE(virtual, "%08x %08lx %lx\n",
 670                      (UINT32)addr, size, type );
 671
 672     /* Fix the parameters */
 673
 674     size = ROUND_SIZE( addr, size );
 675     base = ROUND_ADDR( addr );
 676
 677     if (!(view = VIRTUAL_FindView( base )) ||
 678         (base + size > view->base + view->size))
 679     {
 680         SetLastError( ERROR_INVALID_PARAMETER );
 681         return FALSE;
 682     }
 683
 684     /* Compute the protection flags */
 685
 686     if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
 687     {
 688         SetLastError( ERROR_INVALID_PARAMETER );
 689         return FALSE;
 690     }
 691
 692     /* Free the pages */
 693
 694     if (type == MEM_RELEASE)
 695     {
 696         if (size || (base != view->base))
 697         {
 698             SetLastError( ERROR_INVALID_PARAMETER );
 699             return FALSE;
 700         }
 701         VIRTUAL_DeleteView( view );
 702         return TRUE;
 703     }
 704
 705     /* Decommit the pages */
 706     return VIRTUAL_SetProt( view, base, size, 0 );
 707 }
 708
 709
 710 /***********************************************************************
 711  *             VirtualLock   (KERNEL32.551)
 712  * Locks the specified region of virtual address space
 713  *
 714  * NOTE
 715  *      Always returns TRUE
 716  *
 717  * RETURNS
 718  *      TRUE: Success
 719  *      FALSE: Failure
 720  */
 721 BOOL32 WINAPI VirtualLock(
 722               LPVOID addr, /* [in] Address of first byte of range to lock */
 723               DWORD size   /* [in] Number of bytes in range to lock */
 724 ) {
 725     return TRUE;
 726 }
 727
 728
 729 /***********************************************************************
 730  *             VirtualUnlock   (KERNEL32.556)
 731  * Unlocks a range of pages in the virtual address space
 732  *
 733  * NOTE
 734  *      Always returns TRUE
 735  *
 736  * RETURNS
 737  *      TRUE: Success
 738  *      FALSE: Failure
 739  */
 740 BOOL32 WINAPI VirtualUnlock(
 741               LPVOID addr, /* [in] Address of first byte of range */
 742               DWORD size   /* [in] Number of bytes in range */
 743 ) {
 744     return TRUE;
 745 }
 746
 747
 748 /***********************************************************************
 749  *             VirtualProtect   (KERNEL32.552)
 750  * Changes the access protection on a region of committed pages
 751  *
 752  * RETURNS
 753  *      TRUE: Success
 754  *      FALSE: Failure
 755  */
 756 BOOL32 WINAPI VirtualProtect(
 757               LPVOID addr,     /* [in] Address of region of committed pages */
 758               DWORD size,      /* [in] Size of region */
 759               DWORD new_prot,  /* [in] Desired access protection */
 760               LPDWORD old_prot /* [out] Address of variable to get old protection */
 761 ) {
 762     FILE_VIEW *view;
 763     UINT32 base, i;
 764     BYTE vprot, *p;
 765
 766     TRACE(virtual, "%08x %08lx %08lx\n",
 767                      (UINT32)addr, size, new_prot );
 768
 769     /* Fix the parameters */
 770
 771     size = ROUND_SIZE( addr, size );
 772     base = ROUND_ADDR( addr );
 773
 774     if (!(view = VIRTUAL_FindView( base )) ||
 775         (base + size > view->base + view->size))
 776     {
 777         SetLastError( ERROR_INVALID_PARAMETER );
 778         return FALSE;
 779     }
 780
 781     /* Make sure all the pages are committed */
 782
 783     p = view->prot + ((base - view->base) >> page_shift);
 784     for (i = size >> page_shift; i; i--, p++)
 785     {
 786         if (!(*p & VPROT_COMMITTED))
 787         {
 788             SetLastError( ERROR_INVALID_PARAMETER );
 789             return FALSE;
 790         }
 791     }
 792
 793     VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
 794     vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
 795     return VIRTUAL_SetProt( view, base, size, vprot );
 796 }
 797
 798
 799 /***********************************************************************
 800  *             VirtualProtectEx   (KERNEL32.553)
 801  * Changes the access protection on a region of committed pages in the
 802  * virtual address space of a specified process
 803  *
 804  * RETURNS
 805  *      TRUE: Success
 806  *      FALSE: Failure
 807  */
 808 BOOL32 WINAPI VirtualProtectEx(
 809               HANDLE32 handle, /* [in]  Handle of process */
 810               LPVOID addr,     /* [in]  Address of region of committed pages */
 811               DWORD size,      /* [in]  Size of region */
 812               DWORD new_prot,  /* [in]  Desired access protection */
 813               LPDWORD old_prot /* [out] Address of variable to get old protection */
 814 ) {
 815     BOOL32 ret = FALSE;
 816
 817     PDB32 *pdb = PROCESS_GetPtr( handle, PROCESS_VM_OPERATION, NULL );
 818     if (pdb)
 819     {
 820         if (pdb == PROCESS_Current())
 821             ret = VirtualProtect( addr, size, new_prot, old_prot );
 822         else
 823             ERR(virtual,"Unsupported on other process\n");
 824         K32OBJ_DecCount( &pdb->header );
 825     }
 826     return ret;
 827 }
 828
 829
 830 /***********************************************************************
 831  *             VirtualQuery   (KERNEL32.554)
 832  * Provides info about a range of pages in virtual address space
 833  *
 834  * RETURNS
 835  *      Number of bytes returned in information buffer
 836  */
 837 DWORD WINAPI VirtualQuery(
 838              LPCVOID addr,                    /* [in]  Address of region */
 839              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 840              DWORD len                        /* [in]  Size of buffer */
 841 ) {
 842     FILE_VIEW *view = VIRTUAL_FirstView;
 843     UINT32 base = ROUND_ADDR( addr );
 844     UINT32 alloc_base = 0;
 845     UINT32 size = 0;
 846
 847     /* Find the view containing the address */
 848
 849     for (;;)
 850     {
 851         if (!view)
 852         {
 853             size = 0xffff0000 - alloc_base;
 854             break;
 855         }
 856         if (view->base > base)
 857         {
 858             size = view->base - alloc_base;
 859             view = NULL;
 860             break;
 861         }
 862         if (view->base + view->size > base)
 863         {
 864             alloc_base = view->base;
 865             size = view->size;
 866             break;
 867         }
 868         alloc_base = view->base + view->size;
 869         view = view->next;
 870     }
 871
 872     /* Fill the info structure */
 873
 874     if (!view)
 875     {
 876         info->State             = MEM_FREE;
 877         info->Protect           = 0;
 878         info->AllocationProtect = 0;
 879         info->Type              = 0;
 880     }
 881     else
 882     {
 883         BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
 884         VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
 885         for (size = base - alloc_base; size < view->size; size += page_mask+1)
 886             if (view->prot[size >> page_shift] != vprot) break;
 887         info->AllocationProtect = view->protect;
 888         info->Type              = MEM_PRIVATE;  /* FIXME */
 889     }
 890
 891     info->BaseAddress    = (LPVOID)base;
 892     info->AllocationBase = (LPVOID)alloc_base;
 893     info->RegionSize     = size - (base - alloc_base);
 894     return sizeof(*info);
 895 }
 896
 897
 898 /***********************************************************************
 899  *             VirtualQueryEx   (KERNEL32.555)
 900  * Provides info about a range of pages in virtual address space of a
 901  * specified process
 902  *
 903  * RETURNS
 904  *      Number of bytes returned in information buffer
 905  */
 906 DWORD WINAPI VirtualQueryEx(
 907              HANDLE32 handle,                 /* [in] Handle of process */
 908              LPCVOID addr,                    /* [in] Address of region */
 909              LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
 910              DWORD len                        /* [in] Size of buffer */
 911 ) {
 912     DWORD ret = len;
 913
 914     PDB32 *pdb = PROCESS_GetPtr( handle, PROCESS_QUERY_INFORMATION, NULL );
 915     if (pdb)
 916     {
 917         if (pdb == PROCESS_Current())
 918             ret = VirtualQuery( addr, info, len );
 919         else
 920             ERR(virtual,"Unsupported on other process\n");
 921         K32OBJ_DecCount( &pdb->header );
 922     }
 923     return ret;
 924 }
 925
 926
 927 /***********************************************************************
 928  *             IsBadReadPtr32   (KERNEL32.354)
 929  *
 930  * RETURNS
 931  *      FALSE: Process has read access to entire block
 932  *      TRUE: Otherwise
 933  */
 934 BOOL32 WINAPI IsBadReadPtr32(
 935               LPCVOID ptr, /* Address of memory block */
 936               UINT32 size  /* Size of block */
 937 ) {
 938     return !VIRTUAL_CheckFlags( (UINT32)ptr, size,
 939                                 VPROT_READ | VPROT_COMMITTED );
 940 }
 941
 942
 943 /***********************************************************************
 944  *             IsBadWritePtr32   (KERNEL32.357)
 945  *
 946  * RETURNS
 947  *      FALSE: Process has write access to entire block
 948  *      TRUE: Otherwise
 949  */
 950 BOOL32 WINAPI IsBadWritePtr32(
 951               LPVOID ptr, /* [in] Address of memory block */
 952               UINT32 size /* [in] Size of block in bytes */
 953 ) {
 954     return !VIRTUAL_CheckFlags( (UINT32)ptr, size,
 955                                 VPROT_WRITE | VPROT_COMMITTED );
 956 }
 957
 958
 959 /***********************************************************************
 960  *             IsBadHugeReadPtr32   (KERNEL32.352)
 961  * RETURNS
 962  *      FALSE: Process has read access to entire block
 963  *      TRUE: Otherwise
 964  */
 965 BOOL32 WINAPI IsBadHugeReadPtr32(
 966               LPCVOID ptr, /* [in] Address of memory block */
 967               UINT32 size  /* [in] Size of block */
 968 ) {
 969     return IsBadReadPtr32( ptr, size );
 970 }
 971
 972
 973 /***********************************************************************
 974  *             IsBadHugeWritePtr32   (KERNEL32.353)
 975  * RETURNS
 976  *      FALSE: Process has write access to entire block
 977  *      TRUE: Otherwise
 978  */
 979 BOOL32 WINAPI IsBadHugeWritePtr32(
 980               LPVOID ptr, /* [in] Address of memory block */
 981               UINT32 size /* [in] Size of block */
 982 ) {
 983     return IsBadWritePtr32( ptr, size );
 984 }
 985
 986
 987 /***********************************************************************
 988  *             IsBadCodePtr32   (KERNEL32.351)
 989  *
 990  * RETURNS
 991  *      FALSE: Process has read access to specified memory
 992  *      TRUE: Otherwise
 993  */
 994 BOOL32 WINAPI IsBadCodePtr32(
 995               FARPROC32 ptr /* [in] Address of function */
 996 ) {
 997     return !VIRTUAL_CheckFlags( (UINT32)ptr, 1, VPROT_EXEC | VPROT_COMMITTED );
 998 }
 999
1000
1001 /***********************************************************************
1002  *             IsBadStringPtr32A   (KERNEL32.355)
1003  *
1004  * RETURNS
1005  *      FALSE: Read access to all bytes in string
1006  *      TRUE: Else
1007  */
1008 BOOL32 WINAPI IsBadStringPtr32A(
1009               LPCSTR str, /* [in] Address of string */
1010               UINT32 max  /* [in] Maximum size of string */
1011 ) {
1012     FILE_VIEW *view;
1013     UINT32 page, count;
1014
1015     if (!max) return FALSE;
1016     if (!(view = VIRTUAL_FindView( (UINT32)str ))) return TRUE;
1017     page  = ((UINT32)str - view->base) >> page_shift;
1018     count = page_mask + 1 - ((UINT32)str & page_mask);
1019
1020     while (max)
1021     {
1022         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1023                                                 (VPROT_READ | VPROT_COMMITTED))
1024             return TRUE;
1025         if (count > max) count = max;
1026         max -= count;
1027         while (count--) if (!*str++) return FALSE;
1028         if (++page >= view->size >> page_shift) return TRUE;
1029         count = page_mask + 1;
1030     }
1031     return FALSE;
1032 }
1033
1034
1035 /***********************************************************************
1036  *             IsBadStringPtr32W   (KERNEL32.356)
1037  * See IsBadStringPtr32A
1038  */
1039 BOOL32 WINAPI IsBadStringPtr32W( LPCWSTR str, UINT32 max )
1040 {
1041     FILE_VIEW *view;
1042     UINT32 page, count;
1043
1044     if (!max) return FALSE;
1045     if (!(view = VIRTUAL_FindView( (UINT32)str ))) return TRUE;
1046     page  = ((UINT32)str - view->base) >> page_shift;
1047     count = (page_mask + 1 - ((UINT32)str & page_mask)) / sizeof(WCHAR);
1048
1049     while (max)
1050     {
1051         if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
1052                                                 (VPROT_READ | VPROT_COMMITTED))
1053             return TRUE;
1054         if (count > max) count = max;
1055         max -= count;
1056         while (count--) if (!*str++) return FALSE;
1057         if (++page >= view->size >> page_shift) return TRUE;
1058         count = (page_mask + 1) / sizeof(WCHAR);
1059     }
1060     return FALSE;
1061 }
1062
1063
1064 /***********************************************************************
1065  *             CreateFileMapping32A   (KERNEL32.46)
1066  * Creates a named or unnamed file-mapping object for the specified file
1067  *
1068  * RETURNS
1069  *      Handle: Success
1070  *      0: Mapping object does not exist
1071  *      NULL: Failure
1072  */
1073 HANDLE32 WINAPI CreateFileMapping32A(
1074                 HFILE32 hFile,   /* [in] Handle of file to map */
1075                 SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
1076                 DWORD protect,   /* [in] Protection for mapping object */
1077                 DWORD size_high, /* [in] High-order 32 bits of object size */
1078                 DWORD size_low,  /* [in] Low-order 32 bits of object size */
1079                 LPCSTR name      /* [in] Name of file-mapping object */ )
1080 {
1081     FILE_MAPPING *mapping = NULL;
1082     FILE_OBJECT *file;
1083     struct create_mapping_request req;
1084     struct create_mapping_reply reply = { -1 };
1085     HANDLE32 handle;
1086     BYTE vprot;
1087     BOOL32 inherit = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
1088
1089     /* First search for an object with the same name */
1090
1091     K32OBJ *obj = K32OBJ_FindName( name );
1092
1093     if (obj)
1094     {
1095         if (obj->type == K32OBJ_MEM_MAPPED_FILE)
1096         {
1097             SetLastError( ERROR_ALREADY_EXISTS );
1098             handle = HANDLE_Alloc( PROCESS_Current(), obj,
1099                                    FILE_MAP_ALL_ACCESS /*FIXME*/, inherit, -1 );
1100         }
1101         else
1102         {
1103             SetLastError( ERROR_DUP_NAME );
1104             handle = 0;
1105         }
1106         K32OBJ_DecCount( obj );
1107         return handle;
1108     }
1109
1110     /* Check parameters */
1111
1112     TRACE(virtual,"(%x,%p,%08lx,%08lx%08lx,%s)\n",
1113           hFile, sa, protect, size_high, size_low, debugstr_a(name) );
1114
1115     vprot = VIRTUAL_GetProt( protect );
1116     if (protect & SEC_RESERVE)
1117     {
1118         if (hFile != INVALID_HANDLE_VALUE32)
1119         {
1120             SetLastError( ERROR_INVALID_PARAMETER );
1121             return 0;
1122         }
1123     }
1124     else vprot |= VPROT_COMMITTED;
1125     if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
1126
1127     /* Compute the size and extend the file if necessary */
1128
1129     if (hFile == INVALID_HANDLE_VALUE32)
1130     {
1131         if (!size_high && !size_low)
1132         {
1133             SetLastError( ERROR_INVALID_PARAMETER );
1134             return 0;
1135         }
1136         file = NULL;
1137         if (name)
1138         {
1139             CHAR        buf[260];
1140
1141             GetTempPath32A(260,buf);
1142             GetTempFileName32A(buf,"wine",0,buf);
1143             hFile = CreateFile32A(
1144                 buf,
1145                 GENERIC_READ|GENERIC_WRITE,
1146                 FILE_SHARE_READ|FILE_SHARE_WRITE,/* so we can reuse the tmpfn */
1147                 NULL,
1148                 OPEN_ALWAYS,
1149                 0,
1150                 0
1151             );
1152             /* FIXME: bad hack to avoid lots of leftover tempfiles */
1153             DeleteFile32A(buf);
1154             if (hFile == INVALID_HANDLE_VALUE32)
1155                 FIXME(virtual,"could not create temp. file for anon shared mapping: reason was 0x%08lx\n",GetLastError());
1156         }
1157     }
1158     if (hFile != INVALID_HANDLE_VALUE32) /* We have a file */
1159     {
1160         BY_HANDLE_FILE_INFORMATION info;
1161         DWORD access = GENERIC_READ;
1162
1163         if (((protect & 0xff) == PAGE_READWRITE) ||
1164             ((protect & 0xff) == PAGE_WRITECOPY) ||
1165             ((protect & 0xff) == PAGE_EXECUTE_READWRITE) ||
1166             ((protect & 0xff) == PAGE_EXECUTE_WRITECOPY))
1167                 access |= GENERIC_WRITE;
1168         if (!(file = FILE_GetFile( hFile, access, &req.handle ))) goto error;
1169         if (!GetFileInformationByHandle( hFile, &info )) goto error;
1170         if (!size_high && !size_low)
1171         {
1172             size_high = info.nFileSizeHigh;
1173             size_low  = info.nFileSizeLow;
1174         }
1175         else if ((size_high > info.nFileSizeHigh) ||
1176                  ((size_high == info.nFileSizeHigh) &&
1177                   (size_low > info.nFileSizeLow)))
1178         {
1179             /* We have to grow the file */
1180             if (SetFilePointer( hFile, size_low, &size_high,
1181                                 FILE_BEGIN ) == 0xffffffff) goto error;
1182             if (!SetEndOfFile( hFile )) goto error;
1183         }
1184     }
1185     else req.handle = -1;
1186
1187     /* Create the server object */
1188
1189     req.size_high = size_high;
1190     req.size_low  = ROUND_SIZE( 0, size_low );
1191     req.protect   = vprot;
1192     CLIENT_SendRequest( REQ_CREATE_MAPPING, -1, 2,
1193                         &req, sizeof(req),
1194                         name, name ? strlen(name) : 0 );
1195     if (CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL ))
1196         goto error;
1197
1198     /* Allocate the mapping object */
1199
1200     if (!(mapping = HeapAlloc( SystemHeap, 0, sizeof(*mapping) ))) goto error;
1201     mapping->header.type     = K32OBJ_MEM_MAPPED_FILE;
1202     mapping->header.refcount = 1;
1203     mapping->file            = file;
1204
1205     if (!K32OBJ_AddName( &mapping->header, name )) handle = 0;
1206     else handle = HANDLE_Alloc( PROCESS_Current(), &mapping->header,
1207                                 FILE_MAP_ALL_ACCESS /*FIXME*/, inherit, reply.handle );
1208     K32OBJ_DecCount( &mapping->header );
1209     SetLastError(0); /* Last error value is relevant. (see the start of fun) */
1210     return handle;
1211
1212 error:
1213     if (reply.handle != -1) CLIENT_CloseHandle( reply.handle );
1214     if (file) K32OBJ_DecCount( &file->header );
1215     if (mapping) HeapFree( SystemHeap, 0, mapping );
1216     return 0;
1217 }
1218
1219
1220 /***********************************************************************
1221  *             CreateFileMapping32W   (KERNEL32.47)
1222  * See CreateFileMapping32A
1223  */
1224 HANDLE32 WINAPI CreateFileMapping32W( HFILE32 hFile, LPSECURITY_ATTRIBUTES attr,
1225                                       DWORD protect, DWORD size_high,
1226                                       DWORD size_low, LPCWSTR name )
1227 {
1228     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
1229     HANDLE32 ret = CreateFileMapping32A( hFile, attr, protect,
1230                                          size_high, size_low, nameA );
1231     HeapFree( GetProcessHeap(), 0, nameA );
1232     return ret;
1233 }
1234
1235
1236 /***********************************************************************
1237  *             OpenFileMapping32A   (KERNEL32.397)
1238  * Opens a named file-mapping object.
1239  *
1240  * RETURNS
1241  *      Handle: Success
1242  *      NULL: Failure
1243  */
1244 HANDLE32 WINAPI OpenFileMapping32A(
1245                 DWORD access,   /* [in] Access mode */
1246                 BOOL32 inherit, /* [in] Inherit flag */
1247                 LPCSTR name )   /* [in] Name of file-mapping object */
1248 {
1249     HANDLE32 handle = 0;
1250     K32OBJ *obj;
1251     struct open_named_obj_request req;
1252     struct open_named_obj_reply reply;
1253     int len = name ? strlen(name) + 1 : 0;
1254
1255     req.type    = OPEN_MAPPING;
1256     req.access  = access;
1257     req.inherit = inherit;
1258     CLIENT_SendRequest( REQ_OPEN_NAMED_OBJ, -1, 2, &req, sizeof(req), name, len );
1259     CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
1260
1261     if (reply.handle != -1)
1262     {
1263         SYSTEM_LOCK();
1264         if ((obj = K32OBJ_FindNameType( name, K32OBJ_MEM_MAPPED_FILE )))
1265         {
1266             handle = HANDLE_Alloc( PROCESS_Current(), obj, access, inherit, reply.handle );
1267             K32OBJ_DecCount( obj );
1268             if (handle == INVALID_HANDLE_VALUE32)
1269                 handle = 0; /* must return 0 on failure, not -1 */
1270         }
1271         else CLIENT_CloseHandle( reply.handle );
1272         SYSTEM_UNLOCK();
1273     }
1274     return handle;
1275 }
1276
1277
1278 /***********************************************************************
1279  *             OpenFileMapping32W   (KERNEL32.398)
1280  * See OpenFileMapping32A
1281  */
1282 HANDLE32 WINAPI OpenFileMapping32W( DWORD access, BOOL32 inherit, LPCWSTR name)
1283 {
1284     LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
1285     HANDLE32 ret = OpenFileMapping32A( access, inherit, nameA );
1286     HeapFree( GetProcessHeap(), 0, nameA );
1287     return ret;
1288 }
1289
1290
1291 /***********************************************************************
1292  *           VIRTUAL_DestroyMapping
1293  *
1294  * Destroy a FILE_MAPPING object.
1295  */
1296 static void VIRTUAL_DestroyMapping( K32OBJ *ptr )
1297 {
1298     FILE_MAPPING *mapping = (FILE_MAPPING *)ptr;
1299     assert( ptr->type == K32OBJ_MEM_MAPPED_FILE );
1300
1301     if (mapping->file) K32OBJ_DecCount( &mapping->file->header );
1302     ptr->type = K32OBJ_UNKNOWN;
1303     HeapFree( SystemHeap, 0, mapping );
1304 }
1305
1306
1307 /***********************************************************************
1308  *             MapViewOfFile   (KERNEL32.385)
1309  * Maps a view of a file into the address space
1310  *
1311  * RETURNS
1312  *      Starting address of mapped view
1313  *      NULL: Failure
1314  */
1315 LPVOID WINAPI MapViewOfFile(
1316               HANDLE32 mapping,  /* [in] File-mapping object to map */
1317               DWORD access,      /* [in] Access mode */
1318               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1319               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1320               DWORD count        /* [in] Number of bytes to map */
1321 ) {
1322     return MapViewOfFileEx( mapping, access, offset_high,
1323                             offset_low, count, NULL );
1324 }
1325
1326
1327 /***********************************************************************
1328  *             MapViewOfFileEx   (KERNEL32.386)
1329  * Maps a view of a file into the address space
1330  *
1331  * RETURNS
1332  *      Starting address of mapped view
1333  *      NULL: Failure
1334  */
1335 LPVOID WINAPI MapViewOfFileEx(
1336               HANDLE32 handle,   /* [in] File-mapping object to map */
1337               DWORD access,      /* [in] Access mode */
1338               DWORD offset_high, /* [in] High-order 32 bits of file offset */
1339               DWORD offset_low,  /* [in] Low-order 32 bits of file offset */
1340               DWORD count,       /* [in] Number of bytes to map */
1341               LPVOID addr        /* [in] Suggested starting address for mapped view */
1342 ) {
1343     FILE_MAPPING *mapping;
1344     FILE_VIEW *view;
1345     UINT32 ptr = (UINT32)-1, size = 0;
1346     int flags = MAP_PRIVATE;
1347     int unix_handle = -1;
1348     struct get_mapping_info_request req;
1349     struct get_mapping_info_reply info;
1350
1351     /* Check parameters */
1352
1353     if ((offset_low & granularity_mask) ||
1354         (addr && ((UINT32)addr & granularity_mask)))
1355     {
1356         SetLastError( ERROR_INVALID_PARAMETER );
1357         return NULL;
1358     }
1359
1360     if (!(mapping = (FILE_MAPPING *)HANDLE_GetObjPtr( PROCESS_Current(),
1361                                                       handle,
1362                                                       K32OBJ_MEM_MAPPED_FILE,
1363                                                       0  /* FIXME */, &req.handle )))
1364         return NULL;
1365
1366     CLIENT_SendRequest( REQ_GET_MAPPING_INFO, -1, 1, &req, sizeof(req) );
1367     if (CLIENT_WaitSimpleReply( &info, sizeof(info), &unix_handle ))
1368         goto error;
1369
1370     if (info.size_high || offset_high)
1371         ERR(virtual, "Offsets larger than 4Gb not supported\n");
1372
1373     if ((offset_low >= info.size_low) ||
1374         (count > info.size_low - offset_low))
1375     {
1376         SetLastError( ERROR_INVALID_PARAMETER );
1377         goto error;
1378     }
1379     if (count) size = ROUND_SIZE( offset_low, count );
1380     else size = info.size_low - offset_low;
1381
1382     switch(access)
1383     {
1384     case FILE_MAP_ALL_ACCESS:
1385     case FILE_MAP_WRITE:
1386     case FILE_MAP_WRITE | FILE_MAP_READ:
1387         if (!(info.protect & VPROT_WRITE))
1388         {
1389             SetLastError( ERROR_INVALID_PARAMETER );
1390             goto error;
1391         }
1392         flags = MAP_SHARED;
1393         /* fall through */
1394     case FILE_MAP_READ:
1395     case FILE_MAP_COPY:
1396     case FILE_MAP_COPY | FILE_MAP_READ:
1397         if (info.protect & VPROT_READ) break;
1398         /* fall through */
1399     default:
1400         SetLastError( ERROR_INVALID_PARAMETER );
1401         goto error;
1402     }
1403
1404     /* Map the file */
1405
1406     TRACE(virtual, "handle=%x size=%x offset=%lx\n",
1407                      handle, size, offset_low );
1408
1409     ptr = (UINT32)FILE_dommap( unix_handle,
1410                                addr, 0, size, 0, offset_low,
1411                                VIRTUAL_GetUnixProt( info.protect ),
1412                                flags );
1413     if (ptr == (UINT32)-1) {
1414         /* KB: Q125713, 25-SEP-1995, "Common File Mapping Problems and
1415          * Platform Differences":
1416          * Windows NT: ERROR_INVALID_PARAMETER
1417          * Windows 95: ERROR_INVALID_ADDRESS.
1418          * FIXME: So should we add a module dependend check here? -MM
1419          */
1420         if (errno==ENOMEM)
1421             SetLastError( ERROR_OUTOFMEMORY );
1422         else
1423             SetLastError( ERROR_INVALID_PARAMETER );
1424         goto error;
1425     }
1426
1427     if (!(view = VIRTUAL_CreateView( ptr, size, offset_low, 0,
1428                                      info.protect, handle )))
1429     {
1430         SetLastError( ERROR_OUTOFMEMORY );
1431         goto error;
1432     }
1433     if (unix_handle != -1) close( unix_handle );
1434     K32OBJ_DecCount( &mapping->header );
1435     return (LPVOID)ptr;
1436
1437 error:
1438     if (unix_handle != -1) close( unix_handle );
1439     if (ptr != (UINT32)-1) FILE_munmap( (void *)ptr, 0, size );
1440     K32OBJ_DecCount( &mapping->header );
1441     return NULL;
1442 }
1443
1444
1445 /***********************************************************************
1446  *             FlushViewOfFile   (KERNEL32.262)
1447  * Writes to the disk a byte range within a mapped view of a file
1448  *
1449  * RETURNS
1450  *      TRUE: Success
1451  *      FALSE: Failure
1452  */
1453 BOOL32 WINAPI FlushViewOfFile(
1454               LPCVOID base, /* [in] Start address of byte range to flush */
1455               DWORD cbFlush /* [in] Number of bytes in range */
1456 ) {
1457     FILE_VIEW *view;
1458     UINT32 addr = ROUND_ADDR( base );
1459
1460     TRACE(virtual, "FlushViewOfFile at %p for %ld bytes\n",
1461                      base, cbFlush );
1462
1463     if (!(view = VIRTUAL_FindView( addr )))
1464     {
1465         SetLastError( ERROR_INVALID_PARAMETER );
1466         return FALSE;
1467     }
1468     if (!cbFlush) cbFlush = view->size;
1469     if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
1470     SetLastError( ERROR_INVALID_PARAMETER );
1471     return FALSE;
1472 }
1473
1474
1475 /***********************************************************************
1476  *             UnmapViewOfFile   (KERNEL32.540)
1477  * Unmaps a mapped view of a file.
1478  *
1479  * NOTES
1480  *      Should addr be an LPCVOID?
1481  *
1482  * RETURNS
1483  *      TRUE: Success
1484  *      FALSE: Failure
1485  */
1486 BOOL32 WINAPI UnmapViewOfFile(
1487               LPVOID addr /* [in] Address where mapped view begins */
1488 ) {
1489     FILE_VIEW *view;
1490     UINT32 base = ROUND_ADDR( addr );
1491     if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
1492     {
1493         SetLastError( ERROR_INVALID_PARAMETER );
1494         return FALSE;
1495     }
1496     VIRTUAL_DeleteView( view );
1497     return TRUE;
1498 }
1499
1500 /***********************************************************************
1501  *             VIRTUAL_MapFileW
1502  *
1503  * Helper function to map a file to memory:
1504  *  name                        -       file name
1505  *  [RETURN] ptr                -       pointer to mapped file
1506  */
1507 LPVOID VIRTUAL_MapFileW( LPCWSTR name )
1508 {
1509     HANDLE32 hFile, hMapping;
1510     LPVOID ptr = NULL;
1511
1512     hFile = CreateFile32W( name, GENERIC_READ, FILE_SHARE_READ, NULL,
1513                            OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
1514     if (hFile != INVALID_HANDLE_VALUE32)
1515     {
1516         hMapping = CreateFileMapping32A( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
1517         CloseHandle( hFile );
1518         if (hMapping)
1519         {
1520             ptr = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
1521             CloseHandle( hMapping );
1522         }
1523     }
1524     return ptr;
1525 }