dlls/kernel/heap.c

   1 /*
   2  * Win32 heap functions
   3  *
   4  * Copyright 1995, 1996 Alexandre Julliard
   5  * Copyright 1996 Huw Davies
   6  * Copyright 1998 Ulrich Weigand
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <assert.h>
  27 #include <stdlib.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <sys/types.h>
  32 #include <time.h>
  33 #ifdef HAVE_SYS_PARAM_H
  34 #include <sys/param.h>
  35 #endif
  36 #ifdef HAVE_SYS_SYSCTL_H
  37 #include <sys/sysctl.h>
  38 #endif
  39 #ifdef HAVE_UNISTD_H
  40 # include <unistd.h>
  41 #endif
  42
  43 #ifdef sun
  44 /* FIXME:  Unfortunately swapctl can't be used with largefile.... */
  45 # undef _FILE_OFFSET_BITS
  46 # define _FILE_OFFSET_BITS 32
  47 # ifdef HAVE_SYS_RESOURCE_H
  48 #  include <sys/resource.h>
  49 # endif
  50 # ifdef HAVE_SYS_STAT_H
  51 #  include <sys/stat.h>
  52 # endif
  53 # include <sys/swap.h>
  54 #endif
  55
  56
  57 #include "windef.h"
  58 #include "winbase.h"
  59 #include "winerror.h"
  60 #include "winnt.h"
  61 #include "winternl.h"
  62 #include "excpt.h"
  63 #include "wine/exception.h"
  64 #include "wine/debug.h"
  65
  66 WINE_DEFAULT_DEBUG_CHANNEL(heap);
  67
  68 /* address where we try to map the system heap */
  69 #define SYSTEM_HEAP_BASE  ((void*)0x80000000)
  70 #define SYSTEM_HEAP_SIZE  0x1000000   /* Default heap size = 16Mb */
  71
  72 static HANDLE systemHeap;   /* globally shared heap */
  73
  74
  75 /***********************************************************************
  76  *           HEAP_CreateSystemHeap
  77  *
  78  * Create the system heap.
  79  */
  80 inline static HANDLE HEAP_CreateSystemHeap(void)
  81 {
  82     int created;
  83     void *base;
  84     HANDLE map, event;
  85
  86     /* create the system heap event first */
  87     event = CreateEventA( NULL, TRUE, FALSE, "__wine_system_heap_event" );
  88
  89     if (!(map = CreateFileMappingA( INVALID_HANDLE_VALUE, NULL, SEC_COMMIT | PAGE_READWRITE,
  90                                     0, SYSTEM_HEAP_SIZE, "__wine_system_heap" ))) return 0;
  91     created = (GetLastError() != ERROR_ALREADY_EXISTS);
  92
  93     if (!(base = MapViewOfFileEx( map, FILE_MAP_ALL_ACCESS, 0, 0, 0, SYSTEM_HEAP_BASE )))
  94     {
  95         /* pre-defined address not available */
  96         ERR( "system heap base address %p not available\n", SYSTEM_HEAP_BASE );
  97         return 0;
  98     }
  99
 100     if (created)  /* newly created heap */
 101     {
 102         systemHeap = RtlCreateHeap( HEAP_SHARED, base, SYSTEM_HEAP_SIZE,
 103                                     SYSTEM_HEAP_SIZE, NULL, NULL );
 104         SetEvent( event );
 105     }
 106     else
 107     {
 108         /* wait for the heap to be initialized */
 109         WaitForSingleObject( event, INFINITE );
 110         systemHeap = (HANDLE)base;
 111     }
 112     CloseHandle( map );
 113     return systemHeap;
 114 }
 115
 116
 117 /***********************************************************************
 118  *           HeapCreate   (KERNEL32.@)
 119  *
 120  * Create a heap object.
 121  *
 122  * RETURNS
 123  *      Handle of heap: Success
 124  *      NULL: Failure
 125  */
 126 HANDLE WINAPI HeapCreate(
 127                 DWORD flags,       /* [in] Heap allocation flag */
 128                 SIZE_T initialSize, /* [in] Initial heap size */
 129                 SIZE_T maxSize      /* [in] Maximum heap size */
 130 ) {
 131     HANDLE ret;
 132
 133     if ( flags & HEAP_SHARED )
 134     {
 135         if (!systemHeap) HEAP_CreateSystemHeap();
 136         else WARN( "Shared Heap requested, returning system heap.\n" );
 137         ret = systemHeap;
 138     }
 139     else
 140     {
 141         ret = RtlCreateHeap( flags, NULL, maxSize, initialSize, NULL, NULL );
 142         if (!ret) SetLastError( ERROR_NOT_ENOUGH_MEMORY );
 143     }
 144     return ret;
 145 }
 146
 147
 148 /***********************************************************************
 149  *           HeapDestroy   (KERNEL32.@)
 150  *
 151  * Destroy a heap object.
 152  *
 153  * RETURNS
 154  *      TRUE: Success
 155  *      FALSE: Failure
 156  */
 157 BOOL WINAPI HeapDestroy( HANDLE heap /* [in] Handle of heap */ )
 158 {
 159     if (heap == systemHeap)
 160     {
 161         WARN( "attempt to destroy system heap, returning TRUE!\n" );
 162         return TRUE;
 163     }
 164     if (!RtlDestroyHeap( heap )) return TRUE;
 165     SetLastError( ERROR_INVALID_HANDLE );
 166     return FALSE;
 167 }
 168
 169
 170 /***********************************************************************
 171  *           HeapCompact   (KERNEL32.@)
 172  */
 173 SIZE_T WINAPI HeapCompact( HANDLE heap, DWORD flags )
 174 {
 175     return RtlCompactHeap( heap, flags );
 176 }
 177
 178
 179 /***********************************************************************
 180  *           HeapValidate   (KERNEL32.@)
 181  * Validates a specified heap.
 182  *
 183  * NOTES
 184  *      Flags is ignored.
 185  *
 186  * RETURNS
 187  *      TRUE: Success
 188  *      FALSE: Failure
 189  */
 190 BOOL WINAPI HeapValidate(
 191               HANDLE heap, /* [in] Handle to the heap */
 192               DWORD flags,   /* [in] Bit flags that control access during operation */
 193               LPCVOID block  /* [in] Optional pointer to memory block to validate */
 194 ) {
 195     return RtlValidateHeap( heap, flags, block );
 196 }
 197
 198
 199 /***********************************************************************
 200  *           HeapWalk   (KERNEL32.@)
 201  * Enumerates the memory blocks in a specified heap.
 202  *
 203  * TODO
 204  *   - handling of PROCESS_HEAP_ENTRY_MOVEABLE and
 205  *     PROCESS_HEAP_ENTRY_DDESHARE (needs heap.c support)
 206  *
 207  * RETURNS
 208  *      TRUE: Success
 209  *      FALSE: Failure
 210  */
 211 BOOL WINAPI HeapWalk(
 212               HANDLE heap,               /* [in]  Handle to heap to enumerate */
 213               LPPROCESS_HEAP_ENTRY entry /* [out] Pointer to structure of enumeration info */
 214 ) {
 215     NTSTATUS ret = RtlWalkHeap( heap, entry );
 216     if (ret) SetLastError( RtlNtStatusToDosError(ret) );
 217     return !ret;
 218 }
 219
 220
 221 /***********************************************************************
 222  *           HeapLock   (KERNEL32.@)
 223  * Attempts to acquire the critical section object for a specified heap.
 224  *
 225  * RETURNS
 226  *      TRUE: Success
 227  *      FALSE: Failure
 228  */
 229 BOOL WINAPI HeapLock(
 230               HANDLE heap /* [in] Handle of heap to lock for exclusive access */
 231 ) {
 232     return RtlLockHeap( heap );
 233 }
 234
 235
 236 /***********************************************************************
 237  *           HeapUnlock   (KERNEL32.@)
 238  * Releases ownership of the critical section object.
 239  *
 240  * RETURNS
 241  *      TRUE: Success
 242  *      FALSE: Failure
 243  */
 244 BOOL WINAPI HeapUnlock(
 245               HANDLE heap /* [in] Handle to the heap to unlock */
 246 ) {
 247     return RtlUnlockHeap( heap );
 248 }
 249
 250
 251 /***********************************************************************
 252  *           GetProcessHeap    (KERNEL32.@)
 253  */
 254 HANDLE WINAPI GetProcessHeap(void)
 255 {
 256     return NtCurrentTeb()->Peb->ProcessHeap;
 257 }
 258
 259
 260 /***********************************************************************
 261  *           GetProcessHeaps    (KERNEL32.@)
 262  */
 263 DWORD WINAPI GetProcessHeaps( DWORD count, HANDLE *heaps )
 264 {
 265     return RtlGetProcessHeaps( count, heaps );
 266 }
 267
 268
 269 /* These are needed so that we can call the functions from inside kernel itself */
 270
 271 LPVOID WINAPI HeapAlloc( HANDLE heap, DWORD flags, SIZE_T size )
 272 {
 273     return RtlAllocateHeap( heap, flags, size );
 274 }
 275
 276 BOOL WINAPI HeapFree( HANDLE heap, DWORD flags, LPVOID ptr )
 277 {
 278     return RtlFreeHeap( heap, flags, ptr );
 279 }
 280
 281 LPVOID WINAPI HeapReAlloc( HANDLE heap, DWORD flags, LPVOID ptr, SIZE_T size )
 282 {
 283     return RtlReAllocateHeap( heap, flags, ptr, size );
 284 }
 285
 286 SIZE_T WINAPI HeapSize( HANDLE heap, DWORD flags, LPVOID ptr )
 287 {
 288     return RtlSizeHeap( heap, flags, ptr );
 289 }
 290
 291 /*
 292  * Win32 Global heap functions (GlobalXXX).
 293  * These functions included in Win32 for compatibility with 16 bit Windows
 294  * Especially the moveable blocks and handles are oldish.
 295  * But the ability to directly allocate memory with GPTR and LPTR is widely
 296  * used.
 297  *
 298  * The handle stuff looks horrible, but it's implemented almost like Win95
 299  * does it.
 300  *
 301  */
 302
 303 #define MAGIC_GLOBAL_USED 0x5342
 304 #define HANDLE_TO_INTERN(h)  ((PGLOBAL32_INTERN)(((char *)(h))-2))
 305 #define INTERN_TO_HANDLE(i)  ((HGLOBAL) &((i)->Pointer))
 306 #define POINTER_TO_HANDLE(p) (*(((HGLOBAL *)(p))-2))
 307 #define ISHANDLE(h)          (((ULONG_PTR)(h)&2)!=0)
 308 #define ISPOINTER(h)         (((ULONG_PTR)(h)&2)==0)
 309 /* align the storage needed for the HGLOBAL on an 8byte boundary thus
 310  * GlobalAlloc/GlobalReAlloc'ing with GMEM_MOVEABLE of memory with
 311  * size = 8*k, where k=1,2,3,... alloc's exactly the given size.
 312  * The Minolta DiMAGE Image Viewer heavily relies on this, corrupting
 313  * the output jpeg's > 1 MB if not */
 314 #define HGLOBAL_STORAGE      8  /* sizeof(HGLOBAL)*2 */
 315
 316 #include "pshpack1.h"
 317
 318 typedef struct __GLOBAL32_INTERN
 319 {
 320    WORD         Magic;
 321    LPVOID       Pointer;
 322    BYTE         Flags;
 323    BYTE         LockCount;
 324 } GLOBAL32_INTERN, *PGLOBAL32_INTERN;
 325
 326 #include "poppack.h"
 327
 328 /***********************************************************************
 329  *           GlobalAlloc   (KERNEL32.@)
 330  *
 331  * Allocate a global memory object.
 332  *
 333  * RETURNS
 334  *      Handle: Success
 335  *      NULL: Failure
 336  */
 337 HGLOBAL WINAPI GlobalAlloc(
 338                  UINT flags, /* [in] Object allocation attributes */
 339                  SIZE_T size /* [in] Number of bytes to allocate */
 340 ) {
 341    PGLOBAL32_INTERN     pintern;
 342    DWORD                hpflags;
 343    LPVOID               palloc;
 344
 345    if(flags&GMEM_ZEROINIT)
 346       hpflags=HEAP_ZERO_MEMORY;
 347    else
 348       hpflags=0;
 349
 350    TRACE("() flags=%04x\n",  flags );
 351
 352    if((flags & GMEM_MOVEABLE)==0) /* POINTER */
 353    {
 354       palloc=HeapAlloc(GetProcessHeap(), hpflags, size);
 355       return (HGLOBAL) palloc;
 356    }
 357    else  /* HANDLE */
 358    {
 359       RtlLockHeap(GetProcessHeap());
 360
 361       pintern = HeapAlloc(GetProcessHeap(), 0, sizeof(GLOBAL32_INTERN));
 362       if (pintern)
 363       {
 364           pintern->Magic = MAGIC_GLOBAL_USED;
 365           pintern->Flags = flags >> 8;
 366           pintern->LockCount = 0;
 367
 368           if (size)
 369           {
 370               palloc = HeapAlloc(GetProcessHeap(), hpflags, size+HGLOBAL_STORAGE);
 371               if (!palloc)
 372               {
 373                   HeapFree(GetProcessHeap(), 0, pintern);
 374                   pintern = NULL;
 375               }
 376               else
 377               {
 378                   *(HGLOBAL *)palloc = INTERN_TO_HANDLE(pintern);
 379                   pintern->Pointer = (char *)palloc + HGLOBAL_STORAGE;
 380               }
 381           }
 382           else
 383               pintern->Pointer = NULL;
 384       }
 385
 386       RtlUnlockHeap(GetProcessHeap());
 387       return pintern ? INTERN_TO_HANDLE(pintern) : 0;
 388    }
 389 }
 390
 391
 392 /***********************************************************************
 393  *           GlobalLock   (KERNEL32.@)
 394  *
 395  * Lock a global memory object and return a pointer to first byte of the memory
 396  *
 397  * PARAMS
 398  *  hmem [I] Handle of the global memory object
 399  *
 400  * RETURNS
 401  *  Success: Pointer to first byte of the memory block
 402  *  Failure: NULL
 403  *
 404  * NOTES
 405  *   When the handle is invalid, last error is set to ERROR_INVALID_HANDLE
 406  *
 407  */
 408 LPVOID WINAPI GlobalLock(HGLOBAL hmem)
 409 {
 410     PGLOBAL32_INTERN pintern;
 411     LPVOID           palloc;
 412
 413     if (ISPOINTER(hmem))
 414         return IsBadReadPtr(hmem, 1) ? NULL : hmem;
 415
 416     RtlLockHeap(GetProcessHeap());
 417     __TRY
 418     {
 419         pintern = HANDLE_TO_INTERN(hmem);
 420         if (pintern->Magic == MAGIC_GLOBAL_USED)
 421         {
 422             palloc = pintern->Pointer;
 423             if (!pintern->Pointer)
 424                 SetLastError(ERROR_DISCARDED);
 425             else if (pintern->LockCount < GMEM_LOCKCOUNT)
 426                 pintern->LockCount++;
 427         }
 428         else
 429         {
 430             WARN("invalid handle %p (Magic: 0x%04x)\n", hmem, pintern->Magic);
 431             palloc = NULL;
 432             SetLastError(ERROR_INVALID_HANDLE);
 433         }
 434     }
 435     __EXCEPT_PAGE_FAULT
 436     {
 437         WARN("(%p): Page fault occurred ! Caused by bug ?\n", hmem);
 438         palloc = NULL;
 439         SetLastError(ERROR_INVALID_HANDLE);
 440     }
 441     __ENDTRY
 442     RtlUnlockHeap(GetProcessHeap());
 443     return palloc;
 444 }
 445
 446
 447 /***********************************************************************
 448  *           GlobalUnlock   (KERNEL32.@)
 449  *
 450  * Unlock a global memory object.
 451  *
 452  * PARAMS
 453  *  hmem [I] Handle of the global memory object
 454  *
 455  * RETURNS
 456  *  Success: Object is still locked
 457  *  Failure: FALSE (The Object is unlocked)
 458  *
 459  * NOTES
 460  *   When the handle is invalid, last error is set to ERROR_INVALID_HANDLE
 461  *
 462  */
 463 BOOL WINAPI GlobalUnlock(HGLOBAL hmem)
 464 {
 465     PGLOBAL32_INTERN pintern;
 466     BOOL locked;
 467
 468     if (ISPOINTER(hmem)) return FALSE;
 469
 470     RtlLockHeap(GetProcessHeap());
 471     __TRY
 472     {
 473         pintern=HANDLE_TO_INTERN(hmem);
 474         if(pintern->Magic==MAGIC_GLOBAL_USED)
 475         {
 476             if(pintern->LockCount)
 477             {
 478                 pintern->LockCount--;
 479                 locked = (pintern->LockCount != 0);
 480                 if (!locked) SetLastError(NO_ERROR);
 481             }
 482             else
 483             {
 484                 WARN("%p not locked\n", hmem);
 485                 SetLastError(ERROR_NOT_LOCKED);
 486                 locked = FALSE;
 487             }
 488         }
 489         else
 490         {
 491             WARN("invalid handle %p (Magic: 0x%04x)\n", hmem, pintern->Magic);
 492             SetLastError(ERROR_INVALID_HANDLE);
 493             locked=FALSE;
 494         }
 495     }
 496     __EXCEPT_PAGE_FAULT
 497     {
 498         WARN("(%p): Page fault occurred ! Caused by bug ?\n", hmem);
 499         SetLastError( ERROR_INVALID_PARAMETER );
 500         locked=FALSE;
 501     }
 502     __ENDTRY
 503     RtlUnlockHeap(GetProcessHeap());
 504     return locked;
 505 }
 506
 507
 508 /***********************************************************************
 509  *           GlobalHandle   (KERNEL32.@)
 510  *
 511  * Get the handle associated with the pointer to a global memory block.
 512  *
 513  * RETURNS
 514  *      Handle: Success
 515  *      NULL: Failure
 516  */
 517 HGLOBAL WINAPI GlobalHandle(
 518                  LPCVOID pmem /* [in] Pointer to global memory block */
 519 ) {
 520     HGLOBAL handle;
 521     PGLOBAL32_INTERN  maybe_intern;
 522     LPCVOID test;
 523
 524     if (!pmem)
 525     {
 526         SetLastError( ERROR_INVALID_PARAMETER );
 527         return 0;
 528     }
 529
 530     RtlLockHeap(GetProcessHeap());
 531     __TRY
 532     {
 533         handle = 0;
 534
 535         /* note that if pmem is a pointer to a a block allocated by        */
 536         /* GlobalAlloc with GMEM_MOVEABLE then magic test in HeapValidate  */
 537         /* will fail.                                                      */
 538         if (ISPOINTER(pmem)) {
 539             if (HeapValidate( GetProcessHeap(), 0, pmem )) {
 540                 handle = (HGLOBAL)pmem;  /* valid fixed block */
 541                 break;
 542             }
 543             handle = POINTER_TO_HANDLE(pmem);
 544         } else
 545             handle = (HGLOBAL)pmem;
 546
 547         /* Now test handle either passed in or retrieved from pointer */
 548         maybe_intern = HANDLE_TO_INTERN( handle );
 549         if (maybe_intern->Magic == MAGIC_GLOBAL_USED) {
 550             test = maybe_intern->Pointer;
 551             if (HeapValidate( GetProcessHeap(), 0, (const char *)test - HGLOBAL_STORAGE ) && /* obj(-handle) valid arena? */
 552                 HeapValidate( GetProcessHeap(), 0, maybe_intern ))  /* intern valid arena? */
 553                 break;  /* valid moveable block */
 554         }
 555         handle = 0;
 556         SetLastError( ERROR_INVALID_HANDLE );
 557     }
 558     __EXCEPT_PAGE_FAULT
 559     {
 560         SetLastError( ERROR_INVALID_HANDLE );
 561         handle = 0;
 562     }
 563     __ENDTRY
 564     RtlUnlockHeap(GetProcessHeap());
 565
 566     return handle;
 567 }
 568
 569
 570 /***********************************************************************
 571  *           GlobalReAlloc   (KERNEL32.@)
 572  *
 573  * Change the size or attributes of a global memory object.
 574  *
 575  * RETURNS
 576  *      Handle: Success
 577  *      NULL: Failure
 578  */
 579 HGLOBAL WINAPI GlobalReAlloc(
 580                  HGLOBAL hmem, /* [in] Handle of global memory object */
 581                  SIZE_T size,  /* [in] New size of block */
 582                  UINT flags    /* [in] How to reallocate object */
 583 ) {
 584    LPVOID               palloc;
 585    HGLOBAL            hnew;
 586    PGLOBAL32_INTERN     pintern;
 587    DWORD heap_flags = (flags & GMEM_ZEROINIT) ? HEAP_ZERO_MEMORY : 0;
 588
 589    hnew = 0;
 590    RtlLockHeap(GetProcessHeap());
 591    if(flags & GMEM_MODIFY) /* modify flags */
 592    {
 593       if( ISPOINTER(hmem) && (flags & GMEM_MOVEABLE))
 594       {
 595          /* make a fixed block moveable
 596           * actually only NT is able to do this. But it's soo simple
 597           */
 598          if (hmem == 0)
 599          {
 600              WARN("GlobalReAlloc with null handle!\n");
 601              SetLastError( ERROR_NOACCESS );
 602              hnew = 0;
 603          }
 604          else
 605          {
 606              size = HeapSize(GetProcessHeap(), 0, (LPVOID)hmem);
 607              hnew = GlobalAlloc(flags, size);
 608              palloc = GlobalLock(hnew);
 609              memcpy(palloc, (LPVOID)hmem, size);
 610              GlobalUnlock(hnew);
 611              GlobalFree(hmem);
 612          }
 613       }
 614       else if( ISPOINTER(hmem) &&(flags & GMEM_DISCARDABLE))
 615       {
 616          /* change the flags to make our block "discardable" */
 617          pintern=HANDLE_TO_INTERN(hmem);
 618          pintern->Flags = pintern->Flags | (GMEM_DISCARDABLE >> 8);
 619          hnew=hmem;
 620       }
 621       else
 622       {
 623          SetLastError(ERROR_INVALID_PARAMETER);
 624          hnew = 0;
 625       }
 626    }
 627    else
 628    {
 629       if(ISPOINTER(hmem))
 630       {
 631          /* reallocate fixed memory */
 632          hnew=HeapReAlloc(GetProcessHeap(), heap_flags, hmem, size);
 633       }
 634       else
 635       {
 636          /* reallocate a moveable block */
 637          pintern=HANDLE_TO_INTERN(hmem);
 638
 639 #if 0
 640 /* Apparently Windows doesn't care whether the handle is locked at this point */
 641 /* See also the same comment in GlobalFree() */
 642          if(pintern->LockCount>1) {
 643             ERR("handle 0x%08lx is still locked, cannot realloc!\n",(DWORD)hmem);
 644             SetLastError(ERROR_INVALID_HANDLE);
 645          } else
 646 #endif
 647          if(size!=0)
 648          {
 649             hnew=hmem;
 650             if(pintern->Pointer)
 651             {
 652                if((palloc = HeapReAlloc(GetProcessHeap(), heap_flags,
 653                                    (char *) pintern->Pointer-HGLOBAL_STORAGE,
 654                                    size+HGLOBAL_STORAGE)) == NULL)
 655                    hnew = 0; /* Block still valid */
 656                else
 657                    pintern->Pointer = (char *)palloc+HGLOBAL_STORAGE;
 658             }
 659             else
 660             {
 661                 if((palloc=HeapAlloc(GetProcessHeap(), heap_flags, size+HGLOBAL_STORAGE))
 662                    == NULL)
 663                     hnew = 0;
 664                 else
 665                 {
 666                     *(HGLOBAL *)palloc = hmem;
 667                     pintern->Pointer = (char *)palloc + HGLOBAL_STORAGE;
 668                 }
 669             }
 670          }
 671          else
 672          {
 673             if (pintern->LockCount == 0)
 674             {
 675                 if(pintern->Pointer)
 676                 {
 677                     HeapFree(GetProcessHeap(), 0, (char *) pintern->Pointer-HGLOBAL_STORAGE);
 678                     pintern->Pointer = NULL;
 679                 }
 680                 hnew = hmem;
 681             }
 682             else
 683                 WARN("not freeing memory associated with locked handle\n");
 684          }
 685       }
 686    }
 687    RtlUnlockHeap(GetProcessHeap());
 688    return hnew;
 689 }
 690
 691
 692 /***********************************************************************
 693  *           GlobalFree   (KERNEL32.@)
 694  *
 695  * Free a global memory object.
 696  *
 697  * PARAMS
 698  *  hmem [I] Handle of the global memory object
 699  *
 700  * RETURNS
 701  *  Success: NULL
 702  *  Failure: The provided handle
 703  *
 704  * NOTES
 705  *   When the handle is invalid, last error is set to ERROR_INVALID_HANDLE
 706  *
 707  */
 708 HGLOBAL WINAPI GlobalFree(HGLOBAL hmem)
 709 {
 710     PGLOBAL32_INTERN pintern;
 711     HGLOBAL hreturned;
 712
 713     RtlLockHeap(GetProcessHeap());
 714     __TRY
 715     {
 716         hreturned = 0;
 717         if(ISPOINTER(hmem)) /* POINTER */
 718         {
 719             if(!HeapFree(GetProcessHeap(), 0, (LPVOID) hmem)) hmem = 0;
 720         }
 721         else  /* HANDLE */
 722         {
 723             pintern=HANDLE_TO_INTERN(hmem);
 724
 725             if(pintern->Magic==MAGIC_GLOBAL_USED)
 726             {
 727                 pintern->Magic = 0xdead;
 728
 729                 /* WIN98 does not make this test. That is you can free a */
 730                 /* block you have not unlocked. Go figure!!              */
 731                 /* if(pintern->LockCount!=0)  */
 732                 /*    SetLastError(ERROR_INVALID_HANDLE);  */
 733
 734                 if(pintern->Pointer)
 735                     if(!HeapFree(GetProcessHeap(), 0, (char *)(pintern->Pointer)-HGLOBAL_STORAGE))
 736                         hreturned=hmem;
 737                 if(!HeapFree(GetProcessHeap(), 0, pintern))
 738                     hreturned=hmem;
 739             }
 740             else
 741             {
 742                 WARN("invalid handle %p (Magic: 0x%04x)\n", hmem, pintern->Magic);
 743                 SetLastError(ERROR_INVALID_HANDLE);
 744                 hreturned = hmem;
 745             }
 746         }
 747     }
 748     __EXCEPT_PAGE_FAULT
 749     {
 750         ERR("(%p): Page fault occurred ! Caused by bug ?\n", hmem);
 751         SetLastError( ERROR_INVALID_PARAMETER );
 752         hreturned = hmem;
 753     }
 754     __ENDTRY
 755     RtlUnlockHeap(GetProcessHeap());
 756     return hreturned;
 757 }
 758
 759
 760 /***********************************************************************
 761  *           GlobalSize   (KERNEL32.@)
 762  *
 763  * Get the size of a global memory object.
 764  *
 765  * PARAMS
 766  *  hmem [I] Handle of the global memory object
 767  *
 768  * RETURNS
 769  *  Failure: 0
 770  *  Success: Size in Bytes of the global memory object
 771  *
 772  * NOTES
 773  *   When the handle is invalid, last error is set to ERROR_INVALID_HANDLE
 774  *
 775  */
 776 SIZE_T WINAPI GlobalSize(HGLOBAL hmem)
 777 {
 778    DWORD                retval;
 779    PGLOBAL32_INTERN     pintern;
 780
 781    if (!hmem) return 0;
 782
 783    if(ISPOINTER(hmem))
 784    {
 785       retval=HeapSize(GetProcessHeap(), 0,  (LPVOID) hmem);
 786    }
 787    else
 788    {
 789       RtlLockHeap(GetProcessHeap());
 790       pintern=HANDLE_TO_INTERN(hmem);
 791
 792       if(pintern->Magic==MAGIC_GLOBAL_USED)
 793       {
 794          if (!pintern->Pointer) /* handle case of GlobalAlloc( ??,0) */
 795              retval = 0;
 796          else
 797          {
 798              retval = HeapSize(GetProcessHeap(), 0,
 799                          (char *)(pintern->Pointer) - HGLOBAL_STORAGE );
 800              if (retval != (DWORD)-1) retval -= HGLOBAL_STORAGE;
 801          }
 802       }
 803       else
 804       {
 805          WARN("invalid handle %p (Magic: 0x%04x)\n", hmem, pintern->Magic);
 806          SetLastError(ERROR_INVALID_HANDLE);
 807          retval=0;
 808       }
 809       RtlUnlockHeap(GetProcessHeap());
 810    }
 811    /* HeapSize returns 0xffffffff on failure */
 812    if (retval == 0xffffffff) retval = 0;
 813    return retval;
 814 }
 815
 816
 817 /***********************************************************************
 818  *           GlobalWire   (KERNEL32.@)
 819  */
 820 LPVOID WINAPI GlobalWire(HGLOBAL hmem)
 821 {
 822    return GlobalLock( hmem );
 823 }
 824
 825
 826 /***********************************************************************
 827  *           GlobalUnWire   (KERNEL32.@)
 828  */
 829 BOOL WINAPI GlobalUnWire(HGLOBAL hmem)
 830 {
 831    return GlobalUnlock( hmem);
 832 }
 833
 834
 835 /***********************************************************************
 836  *           GlobalFix   (KERNEL32.@)
 837  */
 838 VOID WINAPI GlobalFix(HGLOBAL hmem)
 839 {
 840     GlobalLock( hmem );
 841 }
 842
 843
 844 /***********************************************************************
 845  *           GlobalUnfix   (KERNEL32.@)
 846  */
 847 VOID WINAPI GlobalUnfix(HGLOBAL hmem)
 848 {
 849    GlobalUnlock( hmem);
 850 }
 851
 852
 853 /***********************************************************************
 854  *           GlobalFlags   (KERNEL32.@)
 855  *
 856  * Get information about a global memory object.
 857  *
 858  * PARAMS
 859  *  hmem [I] Handle of the global memory object
 860  *
 861  * RETURNS
 862  *  Failure: GMEM_INVALID_HANDLE, when the provided handle is invalid
 863  *  Success: Value specifying allocation flags and lock count
 864  *
 865  */
 866 UINT WINAPI GlobalFlags(HGLOBAL hmem)
 867 {
 868    DWORD                retval;
 869    PGLOBAL32_INTERN     pintern;
 870
 871    if(ISPOINTER(hmem))
 872    {
 873       retval=0;
 874    }
 875    else
 876    {
 877       RtlLockHeap(GetProcessHeap());
 878       pintern=HANDLE_TO_INTERN(hmem);
 879       if(pintern->Magic==MAGIC_GLOBAL_USED)
 880       {
 881          retval=pintern->LockCount + (pintern->Flags<<8);
 882          if(pintern->Pointer==0)
 883             retval|= GMEM_DISCARDED;
 884       }
 885       else
 886       {
 887          WARN("invalid handle %p (Magic: 0x%04x)\n", hmem, pintern->Magic);
 888          SetLastError(ERROR_INVALID_HANDLE);
 889          retval = GMEM_INVALID_HANDLE;
 890       }
 891       RtlUnlockHeap(GetProcessHeap());
 892    }
 893    return retval;
 894 }
 895
 896
 897 /***********************************************************************
 898  *           GlobalCompact   (KERNEL32.@)
 899  */
 900 SIZE_T WINAPI GlobalCompact( DWORD minfree )
 901 {
 902     return 0;  /* GlobalCompact does nothing in Win32 */
 903 }
 904
 905
 906 /***********************************************************************
 907  *           LocalAlloc   (KERNEL32.@)
 908  *
 909  * Allocate a local memory object.
 910  *
 911  * RETURNS
 912  *      Handle: Success
 913  *      NULL: Failure
 914  *
 915  * NOTES
 916  *  Windows memory management does not provide a separate local heap
 917  *  and global heap.
 918  */
 919 HLOCAL WINAPI LocalAlloc(
 920                 UINT flags, /* [in] Allocation attributes */
 921                 SIZE_T size /* [in] Number of bytes to allocate */
 922 ) {
 923     return (HLOCAL)GlobalAlloc( flags, size );
 924 }
 925
 926
 927 /***********************************************************************
 928  *           LocalCompact   (KERNEL32.@)
 929  */
 930 SIZE_T WINAPI LocalCompact( UINT minfree )
 931 {
 932     return 0;  /* LocalCompact does nothing in Win32 */
 933 }
 934
 935
 936 /***********************************************************************
 937  *           LocalFlags   (KERNEL32.@)
 938  *
 939  * Get information about a local memory object.
 940  *
 941  * RETURNS
 942  *      Value specifying allocation flags and lock count.
 943  *      LMEM_INVALID_HANDLE: Failure
 944  *
 945  * NOTES
 946  *  Windows memory management does not provide a separate local heap
 947  *  and global heap.
 948  */
 949 UINT WINAPI LocalFlags(
 950               HLOCAL handle /* [in] Handle of memory object */
 951 ) {
 952     return GlobalFlags( (HGLOBAL)handle );
 953 }
 954
 955
 956 /***********************************************************************
 957  *           LocalFree   (KERNEL32.@)
 958  *
 959  * Free a local memory object.
 960  *
 961  * RETURNS
 962  *      NULL: Success
 963  *      Handle: Failure
 964  *
 965  * NOTES
 966  *  Windows memory management does not provide a separate local heap
 967  *  and global heap.
 968  */
 969 HLOCAL WINAPI LocalFree(
 970                 HLOCAL handle /* [in] Handle of memory object */
 971 ) {
 972     return (HLOCAL)GlobalFree( (HGLOBAL)handle );
 973 }
 974
 975
 976 /***********************************************************************
 977  *           LocalHandle   (KERNEL32.@)
 978  *
 979  * Get the handle associated with the pointer to a local memory block.
 980  *
 981  * RETURNS
 982  *      Handle: Success
 983  *      NULL: Failure
 984  *
 985  * NOTES
 986  *  Windows memory management does not provide a separate local heap
 987  *  and global heap.
 988  */
 989 HLOCAL WINAPI LocalHandle(
 990                 LPCVOID ptr /* [in] Address of local memory block */
 991 ) {
 992     return (HLOCAL)GlobalHandle( ptr );
 993 }
 994
 995
 996 /***********************************************************************
 997  *           LocalLock   (KERNEL32.@)
 998  * Locks a local memory object and returns pointer to the first byte
 999  * of the memory block.
1000  *
1001  * RETURNS
1002  *      Pointer: Success
1003  *      NULL: Failure
1004  *
1005  * NOTES
1006  *  Windows memory management does not provide a separate local heap
1007  *  and global heap.
1008  */
1009 LPVOID WINAPI LocalLock(
1010               HLOCAL handle /* [in] Address of local memory object */
1011 ) {
1012     return GlobalLock( (HGLOBAL)handle );
1013 }
1014
1015
1016 /***********************************************************************
1017  *           LocalReAlloc   (KERNEL32.@)
1018  *
1019  * Change the size or attributes of a local memory object.
1020  *
1021  * RETURNS
1022  *      Handle: Success
1023  *      NULL: Failure
1024  *
1025  * NOTES
1026  *  Windows memory management does not provide a separate local heap
1027  *  and global heap.
1028  */
1029 HLOCAL WINAPI LocalReAlloc(
1030                 HLOCAL handle, /* [in] Handle of memory object */
1031                 SIZE_T size,   /* [in] New size of block */
1032                 UINT flags     /* [in] How to reallocate object */
1033 ) {
1034     return (HLOCAL)GlobalReAlloc( (HGLOBAL)handle, size, flags );
1035 }
1036
1037
1038 /***********************************************************************
1039  *           LocalShrink   (KERNEL32.@)
1040  */
1041 SIZE_T WINAPI LocalShrink( HGLOBAL handle, UINT newsize )
1042 {
1043     return 0;  /* LocalShrink does nothing in Win32 */
1044 }
1045
1046
1047 /***********************************************************************
1048  *           LocalSize   (KERNEL32.@)
1049  *
1050  * Get the size of a local memory object.
1051  *
1052  * RETURNS
1053  *      Size: Success
1054  *      0: Failure
1055  *
1056  * NOTES
1057  *  Windows memory management does not provide a separate local heap
1058  *  and global heap.
1059  */
1060 SIZE_T WINAPI LocalSize(
1061               HLOCAL handle /* [in] Handle of memory object */
1062 ) {
1063     return GlobalSize( (HGLOBAL)handle );
1064 }
1065
1066
1067 /***********************************************************************
1068  *           LocalUnlock   (KERNEL32.@)
1069  *
1070  * Unlock a local memory object.
1071  *
1072  * RETURNS
1073  *      TRUE: Object is still locked
1074  *      FALSE: Object is unlocked
1075  *
1076  * NOTES
1077  *  Windows memory management does not provide a separate local heap
1078  *  and global heap.
1079  */
1080 BOOL WINAPI LocalUnlock(
1081               HLOCAL handle /* [in] Handle of memory object */
1082 ) {
1083     return GlobalUnlock( (HGLOBAL)handle );
1084 }
1085
1086
1087 /**********************************************************************
1088  *              AllocMappedBuffer       (KERNEL32.38)
1089  *
1090  * This is an undocumented KERNEL32 function that
1091  * SMapLS's a GlobalAlloc'ed buffer.
1092  *
1093  * RETURNS
1094  *       EDI register: pointer to buffer
1095  *
1096  * NOTES
1097  *       The buffer is preceded by 8 bytes:
1098  *        ...
1099  *       edi+0   buffer
1100  *       edi-4   SEGPTR to buffer
1101  *       edi-8   some magic Win95 needs for SUnMapLS
1102  *               (we use it for the memory handle)
1103  *
1104  *       The SEGPTR is used by the caller!
1105  */
1106 void WINAPI __regs_AllocMappedBuffer(
1107               CONTEXT86 *context /* [in] EDI register: size of buffer to allocate */
1108 ) {
1109     HGLOBAL handle = GlobalAlloc(0, context->Edi + 8);
1110     DWORD *buffer = (DWORD *)GlobalLock(handle);
1111     DWORD ptr = 0;
1112
1113     if (buffer)
1114         if (!(ptr = MapLS(buffer + 2)))
1115         {
1116             GlobalUnlock(handle);
1117             GlobalFree(handle);
1118         }
1119
1120     if (!ptr)
1121         context->Eax = context->Edi = 0;
1122     else
1123     {
1124         buffer[0] = (DWORD)handle;
1125         buffer[1] = ptr;
1126
1127         context->Eax = (DWORD) ptr;
1128         context->Edi = (DWORD)(buffer + 2);
1129     }
1130 }
1131 #ifdef DEFINE_REGS_ENTRYPOINT
1132 DEFINE_REGS_ENTRYPOINT( AllocMappedBuffer, 0, 0 );
1133 #endif
1134
1135 /**********************************************************************
1136  *              FreeMappedBuffer        (KERNEL32.39)
1137  *
1138  * Free a buffer allocated by AllocMappedBuffer
1139  *
1140  * RETURNS
1141  *  Nothing.
1142  */
1143 void WINAPI __regs_FreeMappedBuffer(
1144               CONTEXT86 *context /* [in] EDI register: pointer to buffer */
1145 ) {
1146     if (context->Edi)
1147     {
1148         DWORD *buffer = (DWORD *)context->Edi - 2;
1149
1150         UnMapLS(buffer[1]);
1151
1152         GlobalUnlock((HGLOBAL)buffer[0]);
1153         GlobalFree((HGLOBAL)buffer[0]);
1154     }
1155 }
1156 #ifdef DEFINE_REGS_ENTRYPOINT
1157 DEFINE_REGS_ENTRYPOINT( FreeMappedBuffer, 0, 0 );
1158 #endif
1159
1160 /***********************************************************************
1161  *           GlobalMemoryStatusEx   (KERNEL32.@)
1162  * A version of GlobalMemoryStatus that can deal with memory over 4GB
1163  *
1164  * RETURNS
1165  *      TRUE
1166  */
1167 BOOL WINAPI GlobalMemoryStatusEx( LPMEMORYSTATUSEX lpmemex )
1168 {
1169     static MEMORYSTATUSEX       cached_memstatus;
1170     static int cache_lastchecked = 0;
1171     SYSTEM_INFO si;
1172 #ifdef linux
1173     FILE *f;
1174 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
1175     int *tmp, size_sys, mib[2];
1176 #elif defined(__APPLE__)
1177     int *tmp, mib[2];
1178     size_t size_sys;
1179 #elif defined(sun)
1180     long pagesize,maxpages,freepages,swapspace,swapfree;
1181     struct anoninfo swapinf;
1182     int rval;
1183 #endif
1184
1185     if (time(NULL)==cache_lastchecked) {
1186         memcpy(lpmemex,&cached_memstatus,sizeof(*lpmemex));
1187         return TRUE;
1188     }
1189     cache_lastchecked = time(NULL);
1190
1191     lpmemex->dwLength         = sizeof(*lpmemex);
1192     lpmemex->dwMemoryLoad     = 0;
1193     lpmemex->ullTotalPhys     = 16*1024*1024;
1194     lpmemex->ullAvailPhys     = 16*1024*1024;
1195     lpmemex->ullTotalPageFile = 16*1024*1024;
1196     lpmemex->ullAvailPageFile = 16*1024*1024;
1197
1198 #ifdef linux
1199     f = fopen( "/proc/meminfo", "r" );
1200     if (f)
1201     {
1202         char buffer[256];
1203         int total, used, free, shared, buffers, cached;
1204
1205         lpmemex->ullTotalPhys = lpmemex->ullAvailPhys = 0;
1206         lpmemex->ullTotalPageFile = lpmemex->ullAvailPageFile = 0;
1207         while (fgets( buffer, sizeof(buffer), f ))
1208         {
1209             /* old style /proc/meminfo ... */
1210             if (sscanf( buffer, "Mem: %d %d %d %d %d %d", &total, &used, &free, &shared, &buffers, &cached ))
1211             {
1212                 lpmemex->ullTotalPhys += total;
1213                 lpmemex->ullAvailPhys += free + buffers + cached;
1214             }
1215             if (sscanf( buffer, "Swap: %d %d %d", &total, &used, &free ))
1216             {
1217                 lpmemex->ullTotalPageFile += total;
1218                 lpmemex->ullAvailPageFile += free;
1219             }
1220
1221             /* new style /proc/meminfo ... */
1222             if (sscanf(buffer, "MemTotal: %d", &total))
1223                 lpmemex->ullTotalPhys = total*1024;
1224             if (sscanf(buffer, "MemFree: %d", &free))
1225                 lpmemex->ullAvailPhys = free*1024;
1226             if (sscanf(buffer, "SwapTotal: %d", &total))
1227                 lpmemex->ullTotalPageFile = total*1024;
1228             if (sscanf(buffer, "SwapFree: %d", &free))
1229                 lpmemex->ullAvailPageFile = free*1024;
1230             if (sscanf(buffer, "Buffers: %d", &buffers))
1231                 lpmemex->ullAvailPhys += buffers*1024;
1232             if (sscanf(buffer, "Cached: %d", &cached))
1233                 lpmemex->ullAvailPhys += cached*1024;
1234         }
1235         fclose( f );
1236
1237         if (lpmemex->ullTotalPhys)
1238         {
1239             DWORDLONG TotalPhysical = lpmemex->ullTotalPhys+lpmemex->ullTotalPageFile;
1240             DWORDLONG AvailPhysical = lpmemex->ullAvailPhys+lpmemex->ullAvailPageFile;
1241             lpmemex->dwMemoryLoad = (TotalPhysical-AvailPhysical)
1242                                       / (TotalPhysical / 100);
1243         }
1244     }
1245 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__APPLE__)
1246     mib[0] = CTL_HW;
1247     mib[1] = HW_PHYSMEM;
1248     sysctl(mib, 2, NULL, &size_sys, NULL, 0);
1249     tmp = malloc(size_sys * sizeof(int));
1250     sysctl(mib, 2, tmp, &size_sys, NULL, 0);
1251     if (tmp && *tmp)
1252     {
1253         lpmemex->ullTotalPhys = *tmp;
1254         free(tmp);
1255         mib[1] = HW_USERMEM;
1256         sysctl(mib, 2, NULL, &size_sys, NULL, 0);
1257         tmp = malloc(size_sys * sizeof(int));
1258         sysctl(mib, 2, tmp, &size_sys, NULL, 0);
1259         if (tmp && *tmp)
1260         {
1261             lpmemex->ullAvailPhys = *tmp;
1262             lpmemex->ullTotalPageFile = *tmp;
1263             lpmemex->ullAvailPageFile = *tmp;
1264             lpmemex->dwMemoryLoad = lpmemex->ullTotalPhys - lpmemex->ullAvailPhys;
1265         } else
1266         {
1267             lpmemex->ullAvailPhys = lpmemex->ullTotalPhys;
1268             lpmemex->ullTotalPageFile = lpmemex->ullTotalPhys;
1269             lpmemex->ullAvailPageFile = lpmemex->ullTotalPhys;
1270             lpmemex->dwMemoryLoad = 0;
1271         }
1272         free(tmp);
1273
1274     }
1275 #elif defined ( sun )
1276     pagesize=sysconf(_SC_PAGESIZE);
1277     maxpages=sysconf(_SC_PHYS_PAGES);
1278     freepages=sysconf(_SC_AVPHYS_PAGES);
1279     rval=swapctl(SC_AINFO, &swapinf);
1280     if(rval >-1)
1281     {
1282         swapspace=swapinf.ani_max*pagesize;
1283         swapfree=swapinf.ani_free*pagesize;
1284     }else
1285     {
1286
1287         WARN("Swap size cannot be determined , assuming equal to physical memory\n");
1288         swapspace=maxpages*pagesize;
1289         swapfree=maxpages*pagesize;
1290     }
1291     lpmemex->ullTotalPhys=pagesize*maxpages;
1292     lpmemex->ullAvailPhys = pagesize*freepages;
1293     lpmemex->ullTotalPageFile = swapspace;
1294     lpmemex->ullAvailPageFile = swapfree;
1295     lpmemex->dwMemoryLoad =  lpmemex->ullTotalPhys - lpmemex->ullAvailPhys;
1296 #endif
1297
1298     /* Project2k refuses to start if it sees less than 1Mb of free swap */
1299     if (lpmemex->ullTotalPageFile < lpmemex->ullTotalPhys)
1300         lpmemex->ullTotalPageFile = lpmemex->ullTotalPhys;
1301     if (lpmemex->ullAvailPageFile < lpmemex->ullAvailPhys)
1302         lpmemex->ullAvailPageFile = lpmemex->ullAvailPhys;
1303
1304     /* FIXME: should do something for other systems */
1305     GetSystemInfo(&si);
1306     lpmemex->ullTotalVirtual  = (char*)si.lpMaximumApplicationAddress-(char*)si.lpMinimumApplicationAddress;
1307     /* FIXME: we should track down all the already allocated VM pages and substract them, for now arbitrarily remove 64KB so that it matches NT */
1308     lpmemex->ullAvailVirtual  = lpmemex->ullTotalVirtual-64*1024;
1309
1310     /* MSDN says about AvailExtendedVirtual: Size of unreserved and uncommitted
1311        memory in the extended portion of the virtual address space of the calling
1312        process, in bytes.
1313        However, I don't know what this means, so set it to zero :(
1314     */
1315     lpmemex->ullAvailExtendedVirtual = 0;
1316
1317     memcpy(&cached_memstatus,lpmemex,sizeof(*lpmemex));
1318
1319     TRACE("<-- LPMEMORYSTATUSEX: dwLength %ld, dwMemoryLoad %ld, ullTotalPhys %s, ullAvailPhys %s,"
1320           " ullTotalPageFile %s, ullAvailPageFile %s, ullTotalVirtual %s, ullAvailVirtual %s\n",
1321           lpmemex->dwLength, lpmemex->dwMemoryLoad, wine_dbgstr_longlong(lpmemex->ullTotalPhys),
1322           wine_dbgstr_longlong(lpmemex->ullAvailPhys), wine_dbgstr_longlong(lpmemex->ullTotalPageFile),
1323           wine_dbgstr_longlong(lpmemex->ullAvailPageFile), wine_dbgstr_longlong(lpmemex->ullTotalVirtual),
1324           wine_dbgstr_longlong(lpmemex->ullAvailVirtual) );
1325
1326     return TRUE;
1327 }
1328
1329 /***********************************************************************
1330  *           GlobalMemoryStatus   (KERNEL32.@)
1331  * Provides information about the status of the memory, so apps can tell
1332  * roughly how much they are able to allocate
1333  *
1334  * RETURNS
1335  *      None
1336  */
1337 VOID WINAPI GlobalMemoryStatus( LPMEMORYSTATUS lpBuffer )
1338 {
1339     MEMORYSTATUSEX memstatus;
1340     OSVERSIONINFOW osver;
1341
1342     /* Because GlobalMemoryStatus is identical to GlobalMemoryStatusEX save
1343        for one extra field in the struct, and the lack of a bug, we simply
1344        call GlobalMemoryStatusEx and copy the values across. */
1345     GlobalMemoryStatusEx(&memstatus);
1346
1347     lpBuffer->dwLength = sizeof(*lpBuffer);
1348     lpBuffer->dwMemoryLoad = memstatus.dwMemoryLoad;
1349
1350     /* Windows 2000 and later report -1 when values are greater than 4 Gb.
1351      * NT reports values modulo 4 Gb.
1352      * Values between 2 Gb and 4 Gb are rounded down to 2 Gb.
1353      */
1354
1355     osver.dwOSVersionInfoSize = sizeof(osver);
1356     GetVersionExW(&osver);
1357
1358     if ( osver.dwMajorVersion >= 5 )
1359     {
1360         lpBuffer->dwTotalPhys = (memstatus.ullTotalPhys > MAXDWORD) ? MAXDWORD :
1361                                 (memstatus.ullTotalPhys > MAXLONG) ? MAXLONG : memstatus.ullTotalPhys;
1362         lpBuffer->dwAvailPhys = (memstatus.ullAvailPhys > MAXDWORD) ? MAXDWORD :
1363                                 (memstatus.ullAvailPhys > MAXLONG) ? MAXLONG : memstatus.ullAvailPhys;
1364         lpBuffer->dwTotalPageFile = (memstatus.ullTotalPageFile > MAXDWORD) ? MAXDWORD :
1365                                     (memstatus.ullTotalPageFile > MAXLONG) ? MAXLONG : memstatus.ullTotalPageFile;
1366         lpBuffer->dwAvailPageFile = (memstatus.ullAvailPageFile > MAXDWORD) ? MAXDWORD :
1367                                     (memstatus.ullAvailPageFile > MAXLONG) ? MAXLONG : memstatus.ullAvailPageFile;
1368         lpBuffer->dwTotalVirtual = (memstatus.ullTotalVirtual > MAXDWORD) ? MAXDWORD :
1369                                    (memstatus.ullTotalVirtual > MAXLONG)  ? MAXLONG : memstatus.ullTotalVirtual;
1370         lpBuffer->dwAvailVirtual = (memstatus.ullAvailVirtual > MAXDWORD) ? MAXDWORD :
1371                                    (memstatus.ullAvailVirtual > MAXLONG) ? MAXLONG : memstatus.ullAvailVirtual;
1372     }
1373     else        /* duplicate NT bug */
1374     {
1375         lpBuffer->dwTotalPhys = (memstatus.ullTotalPhys > MAXDWORD) ? memstatus.ullTotalPhys :
1376                                 (memstatus.ullTotalPhys > MAXLONG) ? MAXLONG : memstatus.ullTotalPhys;
1377         lpBuffer->dwAvailPhys = (memstatus.ullAvailPhys > MAXDWORD) ? memstatus.ullAvailPhys :
1378                                 (memstatus.ullAvailPhys > MAXLONG) ? MAXLONG : memstatus.ullAvailPhys;
1379         lpBuffer->dwTotalPageFile = (memstatus.ullTotalPageFile > MAXDWORD) ? memstatus.ullTotalPageFile :
1380                                     (memstatus.ullTotalPageFile > MAXLONG) ? MAXLONG : memstatus.ullTotalPageFile;
1381         lpBuffer->dwAvailPageFile = (memstatus.ullAvailPageFile > MAXDWORD) ? memstatus.ullAvailPageFile :
1382                                     (memstatus.ullAvailPageFile > MAXLONG) ? MAXLONG : memstatus.ullAvailPageFile;
1383         lpBuffer->dwTotalVirtual = (memstatus.ullTotalVirtual > MAXDWORD) ? memstatus.ullTotalVirtual :
1384                                    (memstatus.ullTotalVirtual > MAXLONG)  ? MAXLONG : memstatus.ullTotalVirtual;
1385         lpBuffer->dwAvailVirtual = (memstatus.ullAvailVirtual > MAXDWORD) ? memstatus.ullAvailVirtual :
1386                                    (memstatus.ullAvailVirtual > MAXLONG) ? MAXLONG : memstatus.ullAvailVirtual;
1387     }
1388
1389     /* work around for broken photoshop 4 installer */
1390     if ( lpBuffer->dwAvailPhys +  lpBuffer->dwAvailPageFile >= 2U*1024*1024*1024)
1391          lpBuffer->dwAvailPageFile = 2U*1024*1024*1024 -  lpBuffer->dwAvailPhys - 1;
1392 }