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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 #include "windef.h"
  44 #include "winbase.h"
  45 #include "winerror.h"
  46 #include "winnt.h"
  47 #include "winreg.h"
  48 #include "winternl.h"
  49 #include "excpt.h"
  50 #include "thread.h"
  51 #include "wine/exception.h"
  52 #include "wine/debug.h"
  53
  54 WINE_DEFAULT_DEBUG_CHANNEL(heap);
  55
  56 /* address where we try to map the system heap */
  57 #define SYSTEM_HEAP_BASE  ((void*)0x80000000)
  58 #define SYSTEM_HEAP_SIZE  0x1000000   /* Default heap size = 16Mb */
  59
  60 static HANDLE systemHeap;   /* globally shared heap */
  61
  62
  63
  64 /* filter for page-fault exceptions */
  65 /* It is possible for a bogus global pointer to cause a */
  66 /* page zero reference, so I include EXCEPTION_PRIV_INSTRUCTION too. */
  67 static WINE_EXCEPTION_FILTER(page_fault)
  68 {
  69     switch (GetExceptionCode()) {
  70         case (EXCEPTION_ACCESS_VIOLATION):
  71         case (EXCEPTION_PRIV_INSTRUCTION):
  72            return EXCEPTION_EXECUTE_HANDLER;
  73         default:
  74            return EXCEPTION_CONTINUE_SEARCH;
  75     }
  76 }
  77
  78 /***********************************************************************
  79  *           HEAP_CreateSystemHeap
  80  *
  81  * Create the system heap.
  82  */
  83 inline static HANDLE HEAP_CreateSystemHeap(void)
  84 {
  85     int created;
  86     void *base;
  87     HANDLE map, event;
  88
  89     /* create the system heap event first */
  90     event = CreateEventA( NULL, TRUE, FALSE, "__wine_system_heap_event" );
  91
  92     if (!(map = CreateFileMappingA( INVALID_HANDLE_VALUE, NULL, SEC_COMMIT | PAGE_READWRITE,
  93                                     0, SYSTEM_HEAP_SIZE, "__wine_system_heap" ))) return 0;
  94     created = (GetLastError() != ERROR_ALREADY_EXISTS);
  95
  96     if (!(base = MapViewOfFileEx( map, FILE_MAP_ALL_ACCESS, 0, 0, 0, SYSTEM_HEAP_BASE )))
  97     {
  98         /* pre-defined address not available */
  99         ERR( "system heap base address %p not available\n", SYSTEM_HEAP_BASE );
 100         return 0;
 101     }
 102
 103     if (created)  /* newly created heap */
 104     {
 105         systemHeap = RtlCreateHeap( HEAP_SHARED, base, SYSTEM_HEAP_SIZE,
 106                                     SYSTEM_HEAP_SIZE, NULL, NULL );
 107         SetEvent( event );
 108     }
 109     else
 110     {
 111         /* wait for the heap to be initialized */
 112         WaitForSingleObject( event, INFINITE );
 113         systemHeap = (HANDLE)base;
 114     }
 115     CloseHandle( map );
 116     return systemHeap;
 117 }
 118
 119
 120 /***********************************************************************
 121  *           HeapCreate   (KERNEL32.@)
 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  * RETURNS
 151  *      TRUE: Success
 152  *      FALSE: Failure
 153  */
 154 BOOL WINAPI HeapDestroy( HANDLE heap /* [in] Handle of heap */ )
 155 {
 156     if (heap == systemHeap)
 157     {
 158         WARN( "attempt to destroy system heap, returning TRUE!\n" );
 159         return TRUE;
 160     }
 161     if (!RtlDestroyHeap( heap )) return TRUE;
 162     SetLastError( ERROR_INVALID_HANDLE );
 163     return FALSE;
 164 }
 165
 166
 167 /***********************************************************************
 168  *           HeapCompact   (KERNEL32.@)
 169  */
 170 SIZE_T WINAPI HeapCompact( HANDLE heap, DWORD flags )
 171 {
 172     return RtlCompactHeap( heap, flags );
 173 }
 174
 175
 176 /***********************************************************************
 177  *           HeapValidate   (KERNEL32.@)
 178  * Validates a specified heap.
 179  *
 180  * NOTES
 181  *      Flags is ignored.
 182  *
 183  * RETURNS
 184  *      TRUE: Success
 185  *      FALSE: Failure
 186  */
 187 BOOL WINAPI HeapValidate(
 188               HANDLE heap, /* [in] Handle to the heap */
 189               DWORD flags,   /* [in] Bit flags that control access during operation */
 190               LPCVOID block  /* [in] Optional pointer to memory block to validate */
 191 ) {
 192     return RtlValidateHeap( heap, flags, block );
 193 }
 194
 195
 196 /***********************************************************************
 197  *           HeapWalk   (KERNEL32.@)
 198  * Enumerates the memory blocks in a specified heap.
 199  *
 200  * TODO
 201  *   - handling of PROCESS_HEAP_ENTRY_MOVEABLE and
 202  *     PROCESS_HEAP_ENTRY_DDESHARE (needs heap.c support)
 203  *
 204  * RETURNS
 205  *      TRUE: Success
 206  *      FALSE: Failure
 207  */
 208 BOOL WINAPI HeapWalk(
 209               HANDLE heap,               /* [in]  Handle to heap to enumerate */
 210               LPPROCESS_HEAP_ENTRY entry /* [out] Pointer to structure of enumeration info */
 211 ) {
 212     NTSTATUS ret = RtlWalkHeap( heap, entry );
 213     if (ret) SetLastError( RtlNtStatusToDosError(ret) );
 214     return !ret;
 215 }
 216
 217
 218 /***********************************************************************
 219  *           HeapLock   (KERNEL32.@)
 220  * Attempts to acquire the critical section object for a specified heap.
 221  *
 222  * RETURNS
 223  *      TRUE: Success
 224  *      FALSE: Failure
 225  */
 226 BOOL WINAPI HeapLock(
 227               HANDLE heap /* [in] Handle of heap to lock for exclusive access */
 228 ) {
 229     return RtlLockHeap( heap );
 230 }
 231
 232
 233 /***********************************************************************
 234  *           HeapUnlock   (KERNEL32.@)
 235  * Releases ownership of the critical section object.
 236  *
 237  * RETURNS
 238  *      TRUE: Success
 239  *      FALSE: Failure
 240  */
 241 BOOL WINAPI HeapUnlock(
 242               HANDLE heap /* [in] Handle to the heap to unlock */
 243 ) {
 244     return RtlUnlockHeap( heap );
 245 }
 246
 247
 248 /***********************************************************************
 249  *           GetProcessHeap    (KERNEL32.@)
 250  */
 251 HANDLE WINAPI GetProcessHeap(void)
 252 {
 253     return NtCurrentTeb()->Peb->ProcessHeap;
 254 }
 255
 256
 257 /***********************************************************************
 258  *           GetProcessHeaps    (KERNEL32.@)
 259  */
 260 DWORD WINAPI GetProcessHeaps( DWORD count, HANDLE *heaps )
 261 {
 262     return RtlGetProcessHeaps( count, heaps );
 263 }
 264
 265
 266 /* These are needed so that we can call the functions from inside kernel itself */
 267
 268 LPVOID WINAPI HeapAlloc( HANDLE heap, DWORD flags, SIZE_T size )
 269 {
 270     return RtlAllocateHeap( heap, flags, size );
 271 }
 272
 273 BOOL WINAPI HeapFree( HANDLE heap, DWORD flags, LPVOID ptr )
 274 {
 275     return RtlFreeHeap( heap, flags, ptr );
 276 }
 277
 278 LPVOID WINAPI HeapReAlloc( HANDLE heap, DWORD flags, LPVOID ptr, SIZE_T size )
 279 {
 280     return RtlReAllocateHeap( heap, flags, ptr, size );
 281 }
 282
 283 SIZE_T WINAPI HeapSize( HANDLE heap, DWORD flags, LPVOID ptr )
 284 {
 285     return RtlSizeHeap( heap, flags, ptr );
 286 }
 287
 288 /*
 289  * Win32 Global heap functions (GlobalXXX).
 290  * These functions included in Win32 for compatibility with 16 bit Windows
 291  * Especially the moveable blocks and handles are oldish.
 292  * But the ability to directly allocate memory with GPTR and LPTR is widely
 293  * used.
 294  *
 295  * The handle stuff looks horrible, but it's implemented almost like Win95
 296  * does it.
 297  *
 298  */
 299
 300 #define MAGIC_GLOBAL_USED 0x5342
 301 #define GLOBAL_LOCK_MAX   0xFF
 302 #define HANDLE_TO_INTERN(h)  ((PGLOBAL32_INTERN)(((char *)(h))-2))
 303 #define INTERN_TO_HANDLE(i)  ((HGLOBAL) &((i)->Pointer))
 304 #define POINTER_TO_HANDLE(p) (*(((HGLOBAL *)(p))-2))
 305 #define ISHANDLE(h)          (((ULONG_PTR)(h)&2)!=0)
 306 #define ISPOINTER(h)         (((ULONG_PTR)(h)&2)==0)
 307 /* align the storage needed for the HGLOBAL on an 8byte boundary thus
 308  * GlobalAlloc/GlobalReAlloc'ing with GMEM_MOVEABLE of memory with
 309  * size = 8*k, where k=1,2,3,... alloc's exactly the given size.
 310  * The Minolta DiMAGE Image Viewer heavily relies on this, corrupting
 311  * the output jpeg's > 1 MB if not */
 312 #define HGLOBAL_STORAGE      8  /* sizeof(HGLOBAL)*2 */
 313
 314 #include "pshpack1.h"
 315
 316 typedef struct __GLOBAL32_INTERN
 317 {
 318    WORD         Magic;
 319    LPVOID       Pointer;
 320    BYTE         Flags;
 321    BYTE         LockCount;
 322 } GLOBAL32_INTERN, *PGLOBAL32_INTERN;
 323
 324 #include "poppack.h"
 325
 326 /***********************************************************************
 327  *           GlobalAlloc   (KERNEL32.@)
 328  * RETURNS
 329  *      Handle: Success
 330  *      NULL: Failure
 331  */
 332 HGLOBAL WINAPI GlobalAlloc(
 333                  UINT flags, /* [in] Object allocation attributes */
 334                  SIZE_T size /* [in] Number of bytes to allocate */
 335 ) {
 336    PGLOBAL32_INTERN     pintern;
 337    DWORD                hpflags;
 338    LPVOID               palloc;
 339
 340    if(flags&GMEM_ZEROINIT)
 341       hpflags=HEAP_ZERO_MEMORY;
 342    else
 343       hpflags=0;
 344
 345    TRACE("() flags=%04x\n",  flags );
 346
 347    if((flags & GMEM_MOVEABLE)==0) /* POINTER */
 348    {
 349       palloc=HeapAlloc(GetProcessHeap(), hpflags, size);
 350       return (HGLOBAL) palloc;
 351    }
 352    else  /* HANDLE */
 353    {
 354       RtlLockHeap(GetProcessHeap());
 355
 356       pintern = HeapAlloc(GetProcessHeap(), 0, sizeof(GLOBAL32_INTERN));
 357       if (pintern)
 358       {
 359           pintern->Magic = MAGIC_GLOBAL_USED;
 360           pintern->Flags = flags >> 8;
 361           pintern->LockCount = 0;
 362
 363           if (size)
 364           {
 365               palloc = HeapAlloc(GetProcessHeap(), hpflags, size+HGLOBAL_STORAGE);
 366               if (!palloc)
 367               {
 368                   HeapFree(GetProcessHeap(), 0, pintern);
 369                   pintern = NULL;
 370               }
 371               else
 372               {
 373                   *(HGLOBAL *)palloc = INTERN_TO_HANDLE(pintern);
 374                   pintern->Pointer = (char *)palloc + HGLOBAL_STORAGE;
 375               }
 376           }
 377           else
 378               pintern->Pointer = NULL;
 379       }
 380
 381       RtlUnlockHeap(GetProcessHeap());
 382       return pintern ? INTERN_TO_HANDLE(pintern) : 0;
 383    }
 384 }
 385
 386
 387 /***********************************************************************
 388  *           GlobalLock   (KERNEL32.@)
 389  * RETURNS
 390  *      Pointer to first byte of block
 391  *      NULL: Failure
 392  */
 393 LPVOID WINAPI GlobalLock(
 394               HGLOBAL hmem /* [in] Handle of global memory object */
 395 )
 396 {
 397     PGLOBAL32_INTERN pintern;
 398     LPVOID           palloc;
 399
 400     if (ISPOINTER(hmem))
 401         return IsBadReadPtr(hmem, 1) ? NULL : hmem;
 402
 403     RtlLockHeap(GetProcessHeap());
 404     __TRY
 405     {
 406         pintern = HANDLE_TO_INTERN(hmem);
 407         if (pintern->Magic == MAGIC_GLOBAL_USED)
 408         {
 409             if (pintern->LockCount < GLOBAL_LOCK_MAX)
 410                 pintern->LockCount++;
 411             palloc = pintern->Pointer;
 412         }
 413         else
 414         {
 415             WARN("invalid handle %p\n", hmem);
 416             palloc = NULL;
 417             SetLastError(ERROR_INVALID_HANDLE);
 418         }
 419     }
 420     __EXCEPT(page_fault)
 421     {
 422         WARN("page fault on %p\n", hmem);
 423         palloc = NULL;
 424         SetLastError(ERROR_INVALID_HANDLE);
 425     }
 426     __ENDTRY
 427     RtlUnlockHeap(GetProcessHeap());
 428     return palloc;
 429 }
 430
 431
 432 /***********************************************************************
 433  *           GlobalUnlock   (KERNEL32.@)
 434  * RETURNS
 435  *      TRUE: Object is still locked
 436  *      FALSE: Object is unlocked
 437  */
 438 BOOL WINAPI GlobalUnlock(
 439               HGLOBAL hmem /* [in] Handle of global memory object */
 440 ) {
 441     PGLOBAL32_INTERN pintern;
 442     BOOL locked;
 443
 444     if (ISPOINTER(hmem)) return FALSE;
 445
 446     RtlLockHeap(GetProcessHeap());
 447     __TRY
 448     {
 449         pintern=HANDLE_TO_INTERN(hmem);
 450         if(pintern->Magic==MAGIC_GLOBAL_USED)
 451         {
 452             if((pintern->LockCount<GLOBAL_LOCK_MAX)&&(pintern->LockCount>0))
 453                 pintern->LockCount--;
 454
 455             locked = (pintern->LockCount != 0);
 456             if (!locked) SetLastError(NO_ERROR);
 457         }
 458         else
 459         {
 460             WARN("invalid handle\n");
 461             SetLastError(ERROR_INVALID_HANDLE);
 462             locked=FALSE;
 463         }
 464     }
 465     __EXCEPT(page_fault)
 466     {
 467         ERR("page fault occurred ! Caused by bug ?\n");
 468         SetLastError( ERROR_INVALID_PARAMETER );
 469         locked=FALSE;
 470     }
 471     __ENDTRY
 472     RtlUnlockHeap(GetProcessHeap());
 473     return locked;
 474 }
 475
 476
 477 /***********************************************************************
 478  *           GlobalHandle   (KERNEL32.@)
 479  * Returns the handle associated with the specified pointer.
 480  *
 481  * RETURNS
 482  *      Handle: Success
 483  *      NULL: Failure
 484  */
 485 HGLOBAL WINAPI GlobalHandle(
 486                  LPCVOID pmem /* [in] Pointer to global memory block */
 487 ) {
 488     HGLOBAL handle;
 489     PGLOBAL32_INTERN  maybe_intern;
 490     LPCVOID test;
 491
 492     if (!pmem)
 493     {
 494         SetLastError( ERROR_INVALID_PARAMETER );
 495         return 0;
 496     }
 497
 498     RtlLockHeap(GetProcessHeap());
 499     __TRY
 500     {
 501         handle = 0;
 502
 503         /* note that if pmem is a pointer to a a block allocated by        */
 504         /* GlobalAlloc with GMEM_MOVEABLE then magic test in HeapValidate  */
 505         /* will fail.                                                      */
 506         if (ISPOINTER(pmem)) {
 507             if (HeapValidate( GetProcessHeap(), 0, pmem )) {
 508                 handle = (HGLOBAL)pmem;  /* valid fixed block */
 509                 break;
 510             }
 511             handle = POINTER_TO_HANDLE(pmem);
 512         } else
 513             handle = (HGLOBAL)pmem;
 514
 515         /* Now test handle either passed in or retrieved from pointer */
 516         maybe_intern = HANDLE_TO_INTERN( handle );
 517         if (maybe_intern->Magic == MAGIC_GLOBAL_USED) {
 518             test = maybe_intern->Pointer;
 519             if (HeapValidate( GetProcessHeap(), 0, (const char *)test - HGLOBAL_STORAGE ) && /* obj(-handle) valid arena? */
 520                 HeapValidate( GetProcessHeap(), 0, maybe_intern ))  /* intern valid arena? */
 521                 break;  /* valid moveable block */
 522         }
 523         handle = 0;
 524         SetLastError( ERROR_INVALID_HANDLE );
 525     }
 526     __EXCEPT(page_fault)
 527     {
 528         SetLastError( ERROR_INVALID_HANDLE );
 529         handle = 0;
 530     }
 531     __ENDTRY
 532     RtlUnlockHeap(GetProcessHeap());
 533
 534     return handle;
 535 }
 536
 537
 538 /***********************************************************************
 539  *           GlobalReAlloc   (KERNEL32.@)
 540  * RETURNS
 541  *      Handle: Success
 542  *      NULL: Failure
 543  */
 544 HGLOBAL WINAPI GlobalReAlloc(
 545                  HGLOBAL hmem, /* [in] Handle of global memory object */
 546                  SIZE_T size,  /* [in] New size of block */
 547                  UINT flags    /* [in] How to reallocate object */
 548 ) {
 549    LPVOID               palloc;
 550    HGLOBAL            hnew;
 551    PGLOBAL32_INTERN     pintern;
 552    DWORD heap_flags = (flags & GMEM_ZEROINIT) ? HEAP_ZERO_MEMORY : 0;
 553
 554    hnew = 0;
 555    RtlLockHeap(GetProcessHeap());
 556    if(flags & GMEM_MODIFY) /* modify flags */
 557    {
 558       if( ISPOINTER(hmem) && (flags & GMEM_MOVEABLE))
 559       {
 560          /* make a fixed block moveable
 561           * actually only NT is able to do this. But it's soo simple
 562           */
 563          if (hmem == 0)
 564          {
 565              WARN("GlobalReAlloc with null handle!\n");
 566              SetLastError( ERROR_NOACCESS );
 567              hnew = 0;
 568          }
 569          else
 570          {
 571              size = HeapSize(GetProcessHeap(), 0, (LPVOID)hmem);
 572              hnew = GlobalAlloc(flags, size);
 573              palloc = GlobalLock(hnew);
 574              memcpy(palloc, (LPVOID)hmem, size);
 575              GlobalUnlock(hnew);
 576              GlobalFree(hmem);
 577          }
 578       }
 579       else if( ISPOINTER(hmem) &&(flags & GMEM_DISCARDABLE))
 580       {
 581          /* change the flags to make our block "discardable" */
 582          pintern=HANDLE_TO_INTERN(hmem);
 583          pintern->Flags = pintern->Flags | (GMEM_DISCARDABLE >> 8);
 584          hnew=hmem;
 585       }
 586       else
 587       {
 588          SetLastError(ERROR_INVALID_PARAMETER);
 589          hnew = 0;
 590       }
 591    }
 592    else
 593    {
 594       if(ISPOINTER(hmem))
 595       {
 596          /* reallocate fixed memory */
 597          hnew=(HGLOBAL)HeapReAlloc(GetProcessHeap(), heap_flags, (LPVOID) hmem, size);
 598       }
 599       else
 600       {
 601          /* reallocate a moveable block */
 602          pintern=HANDLE_TO_INTERN(hmem);
 603
 604 #if 0
 605 /* Apparently Windows doesn't care whether the handle is locked at this point */
 606 /* See also the same comment in GlobalFree() */
 607          if(pintern->LockCount>1) {
 608             ERR("handle 0x%08lx is still locked, cannot realloc!\n",(DWORD)hmem);
 609             SetLastError(ERROR_INVALID_HANDLE);
 610          } else
 611 #endif
 612          if(size!=0)
 613          {
 614             hnew=hmem;
 615             if(pintern->Pointer)
 616             {
 617                if((palloc = HeapReAlloc(GetProcessHeap(), heap_flags,
 618                                    (char *) pintern->Pointer-HGLOBAL_STORAGE,
 619                                    size+HGLOBAL_STORAGE)) == NULL)
 620                    hnew = 0; /* Block still valid */
 621                else
 622                    pintern->Pointer = (char *)palloc+HGLOBAL_STORAGE;
 623             }
 624             else
 625             {
 626                 if((palloc=HeapAlloc(GetProcessHeap(), heap_flags, size+HGLOBAL_STORAGE))
 627                    == NULL)
 628                     hnew = 0;
 629                 else
 630                 {
 631                     *(HGLOBAL *)palloc = hmem;
 632                     pintern->Pointer = (char *)palloc + HGLOBAL_STORAGE;
 633                 }
 634             }
 635          }
 636          else
 637          {
 638             if(pintern->Pointer)
 639             {
 640                HeapFree(GetProcessHeap(), 0, (char *) pintern->Pointer-HGLOBAL_STORAGE);
 641                pintern->Pointer=NULL;
 642             }
 643          }
 644       }
 645    }
 646    RtlUnlockHeap(GetProcessHeap());
 647    return hnew;
 648 }
 649
 650
 651 /***********************************************************************
 652  *           GlobalFree   (KERNEL32.@)
 653  * RETURNS
 654  *      NULL: Success
 655  *      Handle: Failure
 656  */
 657 HGLOBAL WINAPI GlobalFree(
 658                  HGLOBAL hmem /* [in] Handle of global memory object */
 659 ) {
 660     PGLOBAL32_INTERN pintern;
 661     HGLOBAL hreturned;
 662
 663     RtlLockHeap(GetProcessHeap());
 664     __TRY
 665     {
 666         hreturned = 0;
 667         if(ISPOINTER(hmem)) /* POINTER */
 668         {
 669             if(!HeapFree(GetProcessHeap(), 0, (LPVOID) hmem)) hmem = 0;
 670         }
 671         else  /* HANDLE */
 672         {
 673             pintern=HANDLE_TO_INTERN(hmem);
 674
 675             if(pintern->Magic==MAGIC_GLOBAL_USED)
 676             {
 677
 678                 /* WIN98 does not make this test. That is you can free a */
 679                 /* block you have not unlocked. Go figure!!              */
 680                 /* if(pintern->LockCount!=0)  */
 681                 /*    SetLastError(ERROR_INVALID_HANDLE);  */
 682
 683                 if(pintern->Pointer)
 684                     if(!HeapFree(GetProcessHeap(), 0, (char *)(pintern->Pointer)-HGLOBAL_STORAGE))
 685                         hreturned=hmem;
 686                 if(!HeapFree(GetProcessHeap(), 0, pintern))
 687                     hreturned=hmem;
 688             }
 689         }
 690     }
 691     __EXCEPT(page_fault)
 692     {
 693         ERR("page fault occurred ! Caused by bug ?\n");
 694         SetLastError( ERROR_INVALID_PARAMETER );
 695         hreturned = hmem;
 696     }
 697     __ENDTRY
 698     RtlUnlockHeap(GetProcessHeap());
 699     return hreturned;
 700 }
 701
 702
 703 /***********************************************************************
 704  *           GlobalSize   (KERNEL32.@)
 705  * RETURNS
 706  *      Size in bytes of the global memory object
 707  *      0: Failure
 708  */
 709 SIZE_T WINAPI GlobalSize(
 710              HGLOBAL hmem /* [in] Handle of global memory object */
 711 ) {
 712    DWORD                retval;
 713    PGLOBAL32_INTERN     pintern;
 714
 715    if (!hmem) return 0;
 716
 717    if(ISPOINTER(hmem))
 718    {
 719       retval=HeapSize(GetProcessHeap(), 0,  (LPVOID) hmem);
 720    }
 721    else
 722    {
 723       RtlLockHeap(GetProcessHeap());
 724       pintern=HANDLE_TO_INTERN(hmem);
 725
 726       if(pintern->Magic==MAGIC_GLOBAL_USED)
 727       {
 728          if (!pintern->Pointer) /* handle case of GlobalAlloc( ??,0) */
 729              retval = 0;
 730          else
 731          {
 732              retval = HeapSize(GetProcessHeap(), 0,
 733                          (char *)(pintern->Pointer) - HGLOBAL_STORAGE );
 734              if (retval != (DWORD)-1) retval -= HGLOBAL_STORAGE;
 735          }
 736       }
 737       else
 738       {
 739          WARN("invalid handle\n");
 740          retval=0;
 741       }
 742       RtlUnlockHeap(GetProcessHeap());
 743    }
 744    /* HeapSize returns 0xffffffff on failure */
 745    if (retval == 0xffffffff) retval = 0;
 746    return retval;
 747 }
 748
 749
 750 /***********************************************************************
 751  *           GlobalWire   (KERNEL32.@)
 752  */
 753 LPVOID WINAPI GlobalWire(HGLOBAL hmem)
 754 {
 755    return GlobalLock( hmem );
 756 }
 757
 758
 759 /***********************************************************************
 760  *           GlobalUnWire   (KERNEL32.@)
 761  */
 762 BOOL WINAPI GlobalUnWire(HGLOBAL hmem)
 763 {
 764    return GlobalUnlock( hmem);
 765 }
 766
 767
 768 /***********************************************************************
 769  *           GlobalFix   (KERNEL32.@)
 770  */
 771 VOID WINAPI GlobalFix(HGLOBAL hmem)
 772 {
 773     GlobalLock( hmem );
 774 }
 775
 776
 777 /***********************************************************************
 778  *           GlobalUnfix   (KERNEL32.@)
 779  */
 780 VOID WINAPI GlobalUnfix(HGLOBAL hmem)
 781 {
 782    GlobalUnlock( hmem);
 783 }
 784
 785
 786 /***********************************************************************
 787  *           GlobalFlags   (KERNEL32.@)
 788  * Returns information about the specified global memory object
 789  *
 790  * NOTES
 791  *      Should this return GMEM_INVALID_HANDLE on invalid handle?
 792  *
 793  * RETURNS
 794  *      Value specifying allocation flags and lock count
 795  *      GMEM_INVALID_HANDLE: Failure
 796  */
 797 UINT WINAPI GlobalFlags(
 798               HGLOBAL hmem /* [in] Handle to global memory object */
 799 ) {
 800    DWORD                retval;
 801    PGLOBAL32_INTERN     pintern;
 802
 803    if(ISPOINTER(hmem))
 804    {
 805       retval=0;
 806    }
 807    else
 808    {
 809       RtlLockHeap(GetProcessHeap());
 810       pintern=HANDLE_TO_INTERN(hmem);
 811       if(pintern->Magic==MAGIC_GLOBAL_USED)
 812       {
 813          retval=pintern->LockCount + (pintern->Flags<<8);
 814          if(pintern->Pointer==0)
 815             retval|= GMEM_DISCARDED;
 816       }
 817       else
 818       {
 819          WARN("Invalid handle: %p\n", hmem);
 820          retval=0;
 821       }
 822       RtlUnlockHeap(GetProcessHeap());
 823    }
 824    return retval;
 825 }
 826
 827
 828 /***********************************************************************
 829  *           GlobalCompact   (KERNEL32.@)
 830  */
 831 SIZE_T WINAPI GlobalCompact( DWORD minfree )
 832 {
 833     return 0;  /* GlobalCompact does nothing in Win32 */
 834 }
 835
 836
 837 /***********************************************************************
 838  *           LocalAlloc   (KERNEL32.@)
 839  * RETURNS
 840  *      Handle: Success
 841  *      NULL: Failure
 842  */
 843 HLOCAL WINAPI LocalAlloc(
 844                 UINT flags, /* [in] Allocation attributes */
 845                 SIZE_T size /* [in] Number of bytes to allocate */
 846 ) {
 847     return (HLOCAL)GlobalAlloc( flags, size );
 848 }
 849
 850
 851 /***********************************************************************
 852  *           LocalCompact   (KERNEL32.@)
 853  */
 854 SIZE_T WINAPI LocalCompact( UINT minfree )
 855 {
 856     return 0;  /* LocalCompact does nothing in Win32 */
 857 }
 858
 859
 860 /***********************************************************************
 861  *           LocalFlags   (KERNEL32.@)
 862  * RETURNS
 863  *      Value specifying allocation flags and lock count.
 864  *      LMEM_INVALID_HANDLE: Failure
 865  */
 866 UINT WINAPI LocalFlags(
 867               HLOCAL handle /* [in] Handle of memory object */
 868 ) {
 869     return GlobalFlags( (HGLOBAL)handle );
 870 }
 871
 872
 873 /***********************************************************************
 874  *           LocalFree   (KERNEL32.@)
 875  * RETURNS
 876  *      NULL: Success
 877  *      Handle: Failure
 878  */
 879 HLOCAL WINAPI LocalFree(
 880                 HLOCAL handle /* [in] Handle of memory object */
 881 ) {
 882     return (HLOCAL)GlobalFree( (HGLOBAL)handle );
 883 }
 884
 885
 886 /***********************************************************************
 887  *           LocalHandle   (KERNEL32.@)
 888  * RETURNS
 889  *      Handle: Success
 890  *      NULL: Failure
 891  */
 892 HLOCAL WINAPI LocalHandle(
 893                 LPCVOID ptr /* [in] Address of local memory object */
 894 ) {
 895     return (HLOCAL)GlobalHandle( ptr );
 896 }
 897
 898
 899 /***********************************************************************
 900  *           LocalLock   (KERNEL32.@)
 901  * Locks a local memory object and returns pointer to the first byte
 902  * of the memory block.
 903  *
 904  * RETURNS
 905  *      Pointer: Success
 906  *      NULL: Failure
 907  */
 908 LPVOID WINAPI LocalLock(
 909               HLOCAL handle /* [in] Address of local memory object */
 910 ) {
 911     return GlobalLock( (HGLOBAL)handle );
 912 }
 913
 914
 915 /***********************************************************************
 916  *           LocalReAlloc   (KERNEL32.@)
 917  * RETURNS
 918  *      Handle: Success
 919  *      NULL: Failure
 920  */
 921 HLOCAL WINAPI LocalReAlloc(
 922                 HLOCAL handle, /* [in] Handle of memory object */
 923                 SIZE_T size,   /* [in] New size of block */
 924                 UINT flags     /* [in] How to reallocate object */
 925 ) {
 926     return (HLOCAL)GlobalReAlloc( (HGLOBAL)handle, size, flags );
 927 }
 928
 929
 930 /***********************************************************************
 931  *           LocalShrink   (KERNEL32.@)
 932  */
 933 SIZE_T WINAPI LocalShrink( HGLOBAL handle, UINT newsize )
 934 {
 935     return 0;  /* LocalShrink does nothing in Win32 */
 936 }
 937
 938
 939 /***********************************************************************
 940  *           LocalSize   (KERNEL32.@)
 941  * RETURNS
 942  *      Size: Success
 943  *      0: Failure
 944  */
 945 SIZE_T WINAPI LocalSize(
 946               HLOCAL handle /* [in] Handle of memory object */
 947 ) {
 948     return GlobalSize( (HGLOBAL)handle );
 949 }
 950
 951
 952 /***********************************************************************
 953  *           LocalUnlock   (KERNEL32.@)
 954  * RETURNS
 955  *      TRUE: Object is still locked
 956  *      FALSE: Object is unlocked
 957  */
 958 BOOL WINAPI LocalUnlock(
 959               HLOCAL handle /* [in] Handle of memory object */
 960 ) {
 961     return GlobalUnlock( (HGLOBAL)handle );
 962 }
 963
 964
 965 /**********************************************************************
 966  *              AllocMappedBuffer       (KERNEL32.38)
 967  *
 968  * This is an undocumented KERNEL32 function that
 969  * SMapLS's a GlobalAlloc'ed buffer.
 970  *
 971  * Input:   EDI register: size of buffer to allocate
 972  * Output:  EDI register: pointer to buffer
 973  *
 974  * Note: The buffer is preceded by 8 bytes:
 975  *        ...
 976  *       edi+0   buffer
 977  *       edi-4   SEGPTR to buffer
 978  *       edi-8   some magic Win95 needs for SUnMapLS
 979  *               (we use it for the memory handle)
 980  *
 981  *       The SEGPTR is used by the caller!
 982  */
 983 void AllocMappedBuffer( CONTEXT86 *context )
 984 {
 985     HGLOBAL handle = GlobalAlloc(0, context->Edi + 8);
 986     DWORD *buffer = (DWORD *)GlobalLock(handle);
 987     DWORD ptr = 0;
 988
 989     if (buffer)
 990         if (!(ptr = MapLS(buffer + 2)))
 991         {
 992             GlobalUnlock(handle);
 993             GlobalFree(handle);
 994         }
 995
 996     if (!ptr)
 997         context->Eax = context->Edi = 0;
 998     else
 999     {
1000         buffer[0] = (DWORD)handle;
1001         buffer[1] = ptr;
1002
1003         context->Eax = (DWORD) ptr;
1004         context->Edi = (DWORD)(buffer + 2);
1005     }
1006 }
1007
1008
1009 /**********************************************************************
1010  *              FreeMappedBuffer        (KERNEL32.39)
1011  *
1012  * Free a buffer allocated by AllocMappedBuffer
1013  *
1014  * Input: EDI register: pointer to buffer
1015  */
1016 void FreeMappedBuffer( CONTEXT86 *context )
1017 {
1018     if (context->Edi)
1019     {
1020         DWORD *buffer = (DWORD *)context->Edi - 2;
1021
1022         UnMapLS(buffer[1]);
1023
1024         GlobalUnlock((HGLOBAL)buffer[0]);
1025         GlobalFree((HGLOBAL)buffer[0]);
1026     }
1027 }
1028
1029 /***********************************************************************
1030  *           GlobalMemoryStatusEx   (KERNEL32.@)
1031  * A version of GlobalMemoryStatus that can deal with memory over 4GB
1032  *
1033  * RETURNS
1034  *      TRUE
1035  */
1036 BOOL WINAPI GlobalMemoryStatusEx( LPMEMORYSTATUSEX lpmemex )
1037 {
1038     static MEMORYSTATUSEX       cached_memstatus;
1039     static int cache_lastchecked = 0;
1040     SYSTEM_INFO si;
1041 #ifdef linux
1042     FILE *f;
1043 #endif
1044 #if defined(__FreeBSD__) || defined(__NetBSD__)
1045     int *tmp;
1046     int size_sys;
1047     int mib[2] = { CTL_HW };
1048 #endif
1049     if (time(NULL)==cache_lastchecked) {
1050         memcpy(lpmemex,&cached_memstatus,sizeof(*lpmemex));
1051         return TRUE;
1052     }
1053     cache_lastchecked = time(NULL);
1054
1055     lpmemex->dwLength         = sizeof(*lpmemex);
1056     lpmemex->dwMemoryLoad     = 0;
1057     lpmemex->ullTotalPhys     = 16*1024*1024;
1058     lpmemex->ullAvailPhys     = 16*1024*1024;
1059     lpmemex->ullTotalPageFile = 16*1024*1024;
1060     lpmemex->ullAvailPageFile = 16*1024*1024;
1061
1062 #ifdef linux
1063     f = fopen( "/proc/meminfo", "r" );
1064     if (f)
1065     {
1066         char buffer[256];
1067         int total, used, free, shared, buffers, cached;
1068
1069         lpmemex->ullTotalPhys = lpmemex->ullAvailPhys = 0;
1070         lpmemex->ullTotalPageFile = lpmemex->ullAvailPageFile = 0;
1071         while (fgets( buffer, sizeof(buffer), f ))
1072         {
1073             /* old style /proc/meminfo ... */
1074             if (sscanf( buffer, "Mem: %d %d %d %d %d %d", &total, &used, &free, &shared, &buffers, &cached ))
1075             {
1076                 lpmemex->ullTotalPhys += total;
1077                 lpmemex->ullAvailPhys += free + buffers + cached;
1078             }
1079             if (sscanf( buffer, "Swap: %d %d %d", &total, &used, &free ))
1080             {
1081                 lpmemex->ullTotalPageFile += total;
1082                 lpmemex->ullAvailPageFile += free;
1083             }
1084
1085             /* new style /proc/meminfo ... */
1086             if (sscanf(buffer, "MemTotal: %d", &total))
1087                 lpmemex->ullTotalPhys = total*1024;
1088             if (sscanf(buffer, "MemFree: %d", &free))
1089                 lpmemex->ullAvailPhys = free*1024;
1090             if (sscanf(buffer, "SwapTotal: %d", &total))
1091                 lpmemex->ullTotalPageFile = total*1024;
1092             if (sscanf(buffer, "SwapFree: %d", &free))
1093                 lpmemex->ullAvailPageFile = free*1024;
1094             if (sscanf(buffer, "Buffers: %d", &buffers))
1095                 lpmemex->ullAvailPhys += buffers*1024;
1096             if (sscanf(buffer, "Cached: %d", &cached))
1097                 lpmemex->ullAvailPhys += cached*1024;
1098         }
1099         fclose( f );
1100
1101         if (lpmemex->ullTotalPhys)
1102         {
1103             DWORDLONG TotalPhysical = lpmemex->ullTotalPhys+lpmemex->ullTotalPageFile;
1104             DWORDLONG AvailPhysical = lpmemex->ullAvailPhys+lpmemex->ullAvailPageFile;
1105             lpmemex->dwMemoryLoad = (TotalPhysical-AvailPhysical)
1106                                       / (TotalPhysical / 100);
1107         }
1108     }
1109 #elif defined(__FreeBSD__) || defined(__NetBSD__)
1110     mib[1] = HW_PHYSMEM;
1111     sysctl(mib, 2, NULL, &size_sys, NULL, 0);
1112     tmp = malloc(size_sys * sizeof(int));
1113     sysctl(mib, 2, tmp, &size_sys, NULL, 0);
1114     if (tmp && *tmp)
1115     {
1116         lpmemex->ullTotalPhys = *tmp;
1117         free(tmp);
1118         mib[1] = HW_USERMEM;
1119         sysctl(mib, 2, NULL, &size_sys, NULL, 0);
1120         tmp = malloc(size_sys * sizeof(int));
1121         sysctl(mib, 2, tmp, &size_sys, NULL, 0);
1122         if (tmp && *tmp)
1123         {
1124             lpmemex->ullAvailPhys = *tmp;
1125             lpmemex->ullTotalPageFile = *tmp;
1126             lpmemex->ullAvailPageFile = *tmp;
1127             lpmemex->dwMemoryLoad = lpmemex->ullTotalPhys - lpmemex->ullAvailPhys;
1128         } else
1129         {
1130             lpmemex->ullAvailPhys = lpmemex->ullTotalPhys;
1131             lpmemex->ullTotalPageFile = lpmemex->ullTotalPhys;
1132             lpmemex->ullAvailPageFile = lpmemex->ullTotalPhys;
1133             lpmemex->dwMemoryLoad = 0;
1134         }
1135         free(tmp);
1136
1137     }
1138 #endif
1139
1140     /* FIXME: should do something for other systems */
1141     GetSystemInfo(&si);
1142     lpmemex->ullTotalVirtual  = (char*)si.lpMaximumApplicationAddress-(char*)si.lpMinimumApplicationAddress;
1143     /* FIXME: we should track down all the already allocated VM pages and substract them, for now arbitrarily remove 64KB so that it matches NT */
1144     lpmemex->ullAvailVirtual  = lpmemex->ullTotalVirtual-64*1024;
1145     memcpy(&cached_memstatus,lpmemex,sizeof(*lpmemex));
1146
1147     /* it appears some memory display programs want to divide by these values */
1148     if(lpmemex->ullTotalPageFile==0)
1149         lpmemex->ullTotalPageFile++;
1150
1151     if(lpmemex->ullAvailPageFile==0)
1152         lpmemex->ullAvailPageFile++;
1153
1154     /* MSDN says about AvailExtendedVirtual: Size of unreserved and uncommitted
1155        memory in the extended portion of the virtual address space of the calling
1156        process, in bytes.
1157        However, I don't know what this means, so set it to zero :(
1158     */
1159     lpmemex->ullAvailExtendedVirtual = 0;
1160
1161     TRACE("<-- LPMEMORYSTATUSEX: dwLength %ld, dwMemoryLoad %ld, ullTotalPhys %s, ullAvailPhys %s,"
1162           " ullTotalPageFile %s, ullAvailPageFile %s, ullTotalVirtual %s, ullAvailVirtual %s\n",
1163           lpmemex->dwLength, lpmemex->dwMemoryLoad, wine_dbgstr_longlong(lpmemex->ullTotalPhys),
1164           wine_dbgstr_longlong(lpmemex->ullAvailPhys), wine_dbgstr_longlong(lpmemex->ullTotalPageFile),
1165           wine_dbgstr_longlong(lpmemex->ullAvailPageFile), wine_dbgstr_longlong(lpmemex->ullTotalVirtual),
1166           wine_dbgstr_longlong(lpmemex->ullAvailVirtual) );
1167
1168     return TRUE;
1169 }
1170
1171 /***********************************************************************
1172  *           GlobalMemoryStatus   (KERNEL32.@)
1173  * Provides information about the status of the memory, so apps can tell
1174  * roughly how much they are able to allocate
1175  *
1176  * RETURNS
1177  *      None
1178  */
1179 VOID WINAPI GlobalMemoryStatus( LPMEMORYSTATUS lpBuffer )
1180 {
1181     MEMORYSTATUSEX memstatus;
1182     OSVERSIONINFOW osver;
1183
1184     /* Because GlobalMemoryStatus is identical to GlobalMemoryStatusEX save
1185        for one extra field in the struct, and the lack of a bug, we simply
1186        call GlobalMemoryStatusEx and copy the values across. */
1187     GlobalMemoryStatusEx(&memstatus);
1188
1189     lpBuffer->dwLength = sizeof(*lpBuffer);
1190     lpBuffer->dwMemoryLoad = memstatus.dwMemoryLoad;
1191
1192     /* Windows 2000 and later report -1 when values are greater than 4 Gb.
1193      * NT reports values modulo 4 Gb.
1194      * Values between 2 Gb and 4 Gb are rounded down to 2 Gb.
1195      */
1196
1197     osver.dwOSVersionInfoSize = sizeof(osver);
1198     GetVersionExW(&osver);
1199
1200     if ( osver.dwMajorVersion >= 5 )
1201     {
1202         lpBuffer->dwTotalPhys = (memstatus.ullTotalPhys > MAXDWORD) ? MAXDWORD :
1203                                 (memstatus.ullTotalPhys > MAXLONG) ? MAXLONG : memstatus.ullTotalPhys;
1204         lpBuffer->dwAvailPhys = (memstatus.ullAvailPhys > MAXDWORD) ? MAXDWORD :
1205                                 (memstatus.ullAvailPhys > MAXLONG) ? MAXLONG : memstatus.ullAvailPhys;
1206         lpBuffer->dwTotalPageFile = (memstatus.ullTotalPageFile > MAXDWORD) ? MAXDWORD :
1207                                     (memstatus.ullTotalPageFile > MAXLONG) ? MAXLONG : memstatus.ullTotalPageFile;
1208         lpBuffer->dwAvailPageFile = (memstatus.ullAvailPageFile > MAXDWORD) ? MAXDWORD :
1209                                     (memstatus.ullAvailPageFile > MAXLONG) ? MAXLONG : memstatus.ullAvailPageFile;
1210         lpBuffer->dwTotalVirtual = (memstatus.ullTotalVirtual > MAXDWORD) ? MAXDWORD :
1211                                    (memstatus.ullTotalVirtual > MAXLONG)  ? MAXLONG : memstatus.ullTotalVirtual;
1212         lpBuffer->dwAvailVirtual = (memstatus.ullAvailVirtual > MAXDWORD) ? MAXDWORD :
1213                                    (memstatus.ullAvailVirtual > MAXLONG) ? MAXLONG : memstatus.ullAvailVirtual;
1214     }
1215     else        /* duplicate NT bug */
1216     {
1217         lpBuffer->dwTotalPhys = (memstatus.ullTotalPhys > MAXDWORD) ? memstatus.ullTotalPhys :
1218                                 (memstatus.ullTotalPhys > MAXLONG) ? MAXLONG : memstatus.ullTotalPhys;
1219         lpBuffer->dwAvailPhys = (memstatus.ullAvailPhys > MAXDWORD) ? memstatus.ullAvailPhys :
1220                                 (memstatus.ullAvailPhys > MAXLONG) ? MAXLONG : memstatus.ullAvailPhys;
1221         lpBuffer->dwTotalPageFile = (memstatus.ullTotalPageFile > MAXDWORD) ? memstatus.ullTotalPageFile :
1222                                     (memstatus.ullTotalPageFile > MAXLONG) ? MAXLONG : memstatus.ullTotalPageFile;
1223         lpBuffer->dwAvailPageFile = (memstatus.ullAvailPageFile > MAXDWORD) ? memstatus.ullAvailPageFile :
1224                                     (memstatus.ullAvailPageFile > MAXLONG) ? MAXLONG : memstatus.ullAvailPageFile;
1225         lpBuffer->dwTotalVirtual = (memstatus.ullTotalVirtual > MAXDWORD) ? memstatus.ullTotalVirtual :
1226                                    (memstatus.ullTotalVirtual > MAXLONG)  ? MAXLONG : memstatus.ullTotalVirtual;
1227         lpBuffer->dwAvailVirtual = (memstatus.ullAvailVirtual > MAXDWORD) ? memstatus.ullAvailVirtual :
1228                                    (memstatus.ullAvailVirtual > MAXLONG) ? MAXLONG : memstatus.ullAvailVirtual;
1229     }
1230
1231     /* work around for broken photoshop 4 installer */
1232     if ( lpBuffer->dwAvailPhys +  lpBuffer->dwAvailPageFile >= 2U*1024*1024*1024)
1233          lpBuffer->dwAvailPageFile = 2U*1024*1024*1024 -  lpBuffer->dwAvailPhys - 1;
1234 }