memory/global.c

   1 /*
   2  * Global heap functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 /* 0xffff sometimes seems to mean: CURRENT_DS */
  21
  22 #include "config.h"
  23 #include "wine/port.h"
  24
  25 #include <sys/types.h>
  26 #include <stdlib.h>
  27 #include <time.h>
  28 #include <stdio.h>
  29 #ifdef HAVE_UNISTD_H
  30 # include <unistd.h>
  31 #endif
  32 #include <string.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
  40 #include "wine/winbase16.h"
  41 #include "wine/exception.h"
  42 #include "global.h"
  43 #include "toolhelp.h"
  44 #include "selectors.h"
  45 #include "miscemu.h"
  46 #include "stackframe.h"
  47 #include "wine/debug.h"
  48 #include "winerror.h"
  49 #include "excpt.h"
  50
  51 WINE_DEFAULT_DEBUG_CHANNEL(global);
  52
  53   /* Global arena block */
  54 typedef struct
  55 {
  56     DWORD     base;          /* Base address (0 if discarded) */
  57     DWORD     size;          /* Size in bytes (0 indicates a free block) */
  58     HGLOBAL16 handle;        /* Handle for this block */
  59     HGLOBAL16 hOwner;        /* Owner of this block */
  60     BYTE      lockCount;     /* Count of GlobalFix() calls */
  61     BYTE      pageLockCount; /* Count of GlobalPageLock() calls */
  62     BYTE      flags;         /* Allocation flags */
  63     BYTE      selCount;      /* Number of selectors allocated for this block */
  64 } GLOBALARENA;
  65
  66   /* Flags definitions */
  67 #define GA_MOVEABLE     0x02  /* same as GMEM_MOVEABLE */
  68 #define GA_DGROUP       0x04
  69 #define GA_DISCARDABLE  0x08
  70 #define GA_IPCSHARE     0x10  /* same as GMEM_DDESHARE */
  71 #define GA_DOSMEM       0x20
  72
  73   /* Arena array */
  74 static GLOBALARENA *pGlobalArena = NULL;
  75 static int globalArenaSize = 0;
  76
  77 #define GLOBAL_MAX_ALLOC_SIZE 0x00ff0000  /* Largest allocation is 16M - 64K */
  78
  79 #define VALID_HANDLE(handle) (((handle)>>__AHSHIFT)<globalArenaSize)
  80 #define GET_ARENA_PTR(handle)  (pGlobalArena + ((handle) >> __AHSHIFT))
  81
  82 /* filter for page-fault exceptions */
  83 /* It is possible for a bogus global pointer to cause a */
  84 /* page zero reference, so I include EXCEPTION_PRIV_INSTRUCTION too. */
  85
  86 static WINE_EXCEPTION_FILTER(page_fault)
  87 {
  88     switch (GetExceptionCode()) {
  89         case (EXCEPTION_ACCESS_VIOLATION):
  90         case (EXCEPTION_PRIV_INSTRUCTION):
  91            return EXCEPTION_EXECUTE_HANDLER;
  92         default:
  93            return EXCEPTION_CONTINUE_SEARCH;
  94     }
  95 }
  96
  97 /***********************************************************************
  98  *           GLOBAL_GetArena
  99  *
 100  * Return the arena for a given selector, growing the arena array if needed.
 101  */
 102 static GLOBALARENA *GLOBAL_GetArena( WORD sel, WORD selcount )
 103 {
 104     if (((sel >> __AHSHIFT) + selcount) > globalArenaSize)
 105     {
 106         int newsize = ((sel >> __AHSHIFT) + selcount + 0xff) & ~0xff;
 107         GLOBALARENA *pNewArena = realloc( pGlobalArena,
 108                                           newsize * sizeof(GLOBALARENA) );
 109         if (!pNewArena) return 0;
 110         pGlobalArena = pNewArena;
 111         memset( pGlobalArena + globalArenaSize, 0,
 112                 (newsize - globalArenaSize) * sizeof(GLOBALARENA) );
 113         globalArenaSize = newsize;
 114     }
 115     return pGlobalArena + (sel >> __AHSHIFT);
 116 }
 117
 118 void debug_handles(void)
 119 {
 120     int printed=0;
 121     int i;
 122     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 123         if (pGlobalArena[i].size!=0 && (pGlobalArena[i].handle & 0x8000)){
 124             printed=1;
 125             DPRINTF("0x%08x, ",pGlobalArena[i].handle);
 126         }
 127     }
 128     if (printed)
 129         DPRINTF("\n");
 130 }
 131
 132
 133 /***********************************************************************
 134  *           GLOBAL_CreateBlock
 135  *
 136  * Create a global heap block for a fixed range of linear memory.
 137  */
 138 HGLOBAL16 GLOBAL_CreateBlock( WORD flags, const void *ptr, DWORD size,
 139                               HGLOBAL16 hOwner, unsigned char selflags )
 140 {
 141     WORD sel, selcount;
 142     GLOBALARENA *pArena;
 143
 144       /* Allocate the selector(s) */
 145
 146     sel = SELECTOR_AllocBlock( ptr, size, selflags );
 147     if (!sel) return 0;
 148     selcount = (size + 0xffff) / 0x10000;
 149
 150     if (!(pArena = GLOBAL_GetArena( sel, selcount )))
 151     {
 152         SELECTOR_FreeBlock( sel );
 153         return 0;
 154     }
 155
 156       /* Fill the arena block */
 157
 158     pArena->base = (DWORD)ptr;
 159     pArena->size = GetSelectorLimit16(sel) + 1;
 160     pArena->handle = (flags & GMEM_MOVEABLE) ? sel - 1 : sel;
 161     pArena->hOwner = hOwner;
 162     pArena->lockCount = 0;
 163     pArena->pageLockCount = 0;
 164     pArena->flags = flags & GA_MOVEABLE;
 165     if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 166     if (flags & GMEM_DDESHARE) pArena->flags |= GA_IPCSHARE;
 167     if (!(selflags & (WINE_LDT_FLAGS_CODE^WINE_LDT_FLAGS_DATA))) pArena->flags |= GA_DGROUP;
 168     pArena->selCount = selcount;
 169     if (selcount > 1)  /* clear the next arena blocks */
 170         memset( pArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 171
 172     return pArena->handle;
 173 }
 174
 175
 176 /***********************************************************************
 177  *           GLOBAL_FreeBlock
 178  *
 179  * Free a block allocated by GLOBAL_CreateBlock, without touching
 180  * the associated linear memory range.
 181  */
 182 BOOL16 GLOBAL_FreeBlock( HGLOBAL16 handle )
 183 {
 184     WORD sel;
 185     GLOBALARENA *pArena;
 186
 187     if (!handle) return TRUE;
 188     sel = GlobalHandleToSel16( handle );
 189     if (!VALID_HANDLE(sel))
 190         return FALSE;
 191     pArena = GET_ARENA_PTR(sel);
 192     SELECTOR_FreeBlock( sel );
 193     memset( pArena, 0, sizeof(GLOBALARENA) );
 194     return TRUE;
 195 }
 196
 197 /***********************************************************************
 198  *           GLOBAL_MoveBlock
 199  */
 200 BOOL16 GLOBAL_MoveBlock( HGLOBAL16 handle, const void *ptr, DWORD size )
 201 {
 202     WORD sel;
 203     GLOBALARENA *pArena;
 204
 205     if (!handle) return TRUE;
 206     sel = GlobalHandleToSel16( handle );
 207     if (!VALID_HANDLE(sel))
 208         return FALSE;
 209     pArena = GET_ARENA_PTR(sel);
 210     if (pArena->selCount != 1)
 211         return FALSE;
 212
 213     pArena->base = (DWORD)ptr;
 214     pArena->size = size;
 215     SELECTOR_ReallocBlock( sel, ptr, size );
 216     return TRUE;
 217 }
 218
 219 /***********************************************************************
 220  *           GLOBAL_Alloc
 221  *
 222  * Implementation of GlobalAlloc16()
 223  */
 224 HGLOBAL16 GLOBAL_Alloc( UINT16 flags, DWORD size, HGLOBAL16 hOwner, unsigned char selflags )
 225 {
 226     void *ptr;
 227     HGLOBAL16 handle;
 228
 229     TRACE("%ld flags=%04x\n", size, flags );
 230
 231     /* If size is 0, create a discarded block */
 232
 233     if (size == 0) return GLOBAL_CreateBlock( flags, NULL, 1, hOwner, selflags );
 234
 235     /* Fixup the size */
 236
 237     if (size >= GLOBAL_MAX_ALLOC_SIZE - 0x1f) return 0;
 238     size = (size + 0x1f) & ~0x1f;
 239
 240     /* Allocate the linear memory */
 241     ptr = HeapAlloc( GetProcessHeap(), 0, size );
 242       /* FIXME: free discardable blocks and try again? */
 243     if (!ptr) return 0;
 244
 245       /* Allocate the selector(s) */
 246
 247     handle = GLOBAL_CreateBlock( flags, ptr, size, hOwner, selflags );
 248     if (!handle)
 249     {
 250         HeapFree( GetProcessHeap(), 0, ptr );
 251         return 0;
 252     }
 253
 254     if (flags & GMEM_ZEROINIT) memset( ptr, 0, size );
 255     return handle;
 256 }
 257
 258 /***********************************************************************
 259  *           GlobalAlloc     (KERNEL.15)
 260  *           GlobalAlloc16   (KERNEL32.24)
 261  * RETURNS
 262  *      Handle: Success
 263  *      NULL: Failure
 264  */
 265 HGLOBAL16 WINAPI GlobalAlloc16(
 266                  UINT16 flags, /* [in] Object allocation attributes */
 267                  DWORD size    /* [in] Number of bytes to allocate */
 268 ) {
 269     HANDLE16 owner = GetCurrentPDB16();
 270
 271     if (flags & GMEM_DDESHARE)
 272         owner = GetExePtr(owner);  /* Make it a module handle */
 273     return GLOBAL_Alloc( flags, size, owner, WINE_LDT_FLAGS_DATA );
 274 }
 275
 276
 277 /***********************************************************************
 278  *           GlobalReAlloc     (KERNEL.16)
 279  * RETURNS
 280  *      Handle: Success
 281  *      NULL: Failure
 282  */
 283 HGLOBAL16 WINAPI GlobalReAlloc16(
 284                  HGLOBAL16 handle, /* [in] Handle of global memory object */
 285                  DWORD size,       /* [in] New size of block */
 286                  UINT16 flags      /* [in] How to reallocate object */
 287 ) {
 288     WORD selcount;
 289     DWORD oldsize;
 290     void *ptr, *newptr;
 291     GLOBALARENA *pArena, *pNewArena;
 292     WORD sel = GlobalHandleToSel16( handle );
 293
 294     TRACE("%04x %ld flags=%04x\n",
 295                     handle, size, flags );
 296     if (!handle) return 0;
 297
 298     if (!VALID_HANDLE(handle)) {
 299         WARN("Invalid handle 0x%04x!\n", handle);
 300         return 0;
 301     }
 302     pArena = GET_ARENA_PTR( handle );
 303
 304       /* Discard the block if requested */
 305
 306     if ((size == 0) && (flags & GMEM_MOVEABLE) && !(flags & GMEM_MODIFY))
 307     {
 308         if (!(pArena->flags & GA_MOVEABLE) ||
 309             !(pArena->flags & GA_DISCARDABLE) ||
 310             (pArena->lockCount > 0) || (pArena->pageLockCount > 0)) return 0;
 311         if (pArena->flags & GA_DOSMEM)
 312             DOSMEM_FreeBlock( (void *)pArena->base );
 313         else
 314             HeapFree( GetProcessHeap(), 0, (void *)pArena->base );
 315         pArena->base = 0;
 316
 317         /* Note: we rely on the fact that SELECTOR_ReallocBlock won't
 318          * change the selector if we are shrinking the block.
 319          * FIXME: shouldn't we keep selectors until the block is deleted?
 320          */
 321         SELECTOR_ReallocBlock( sel, 0, 1 );
 322         return handle;
 323     }
 324
 325       /* Fixup the size */
 326
 327     if (size > GLOBAL_MAX_ALLOC_SIZE - 0x20) return 0;
 328     if (size == 0) size = 0x20;
 329     else size = (size + 0x1f) & ~0x1f;
 330
 331       /* Change the flags */
 332
 333     if (flags & GMEM_MODIFY)
 334     {
 335           /* Change the flags, leaving GA_DGROUP alone */
 336         pArena->flags = (pArena->flags & GA_DGROUP) | (flags & GA_MOVEABLE);
 337         if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 338         return handle;
 339     }
 340
 341       /* Reallocate the linear memory */
 342
 343     ptr = (void *)pArena->base;
 344     oldsize = pArena->size;
 345     TRACE("oldbase %p oldsize %08lx newsize %08lx\n", ptr,oldsize,size);
 346     if (ptr && (size == oldsize)) return handle;  /* Nothing to do */
 347
 348     if (pArena->flags & GA_DOSMEM)
 349     {
 350         if (DOSMEM_ResizeBlock(ptr, size, TRUE) == size)
 351             newptr = ptr;
 352         else if(pArena->pageLockCount > 0)
 353             newptr = 0;
 354         else
 355         {
 356             newptr = DOSMEM_GetBlock( size, 0 );
 357             if (newptr)
 358             {
 359                 memcpy( newptr, ptr, oldsize );
 360                 DOSMEM_FreeBlock( ptr );
 361             }
 362         }
 363     }
 364     else
 365     {
 366         /*
 367          * if more then one reader (e.g. some pointer has been
 368          * given out by GetVDMPointer32W16),
 369          * only try to realloc in place
 370          */
 371         newptr = HeapReAlloc( GetProcessHeap(),
 372                               (pArena->pageLockCount > 0) ?
 373                               HEAP_REALLOC_IN_PLACE_ONLY : 0,
 374                               ptr, size );
 375     }
 376
 377     if (!newptr)
 378     {
 379         FIXME("Realloc failed lock %d\n",pArena->pageLockCount);
 380         if (pArena->pageLockCount <1)
 381         {
 382             if (pArena->flags & GA_DOSMEM)
 383                 DOSMEM_FreeBlock( (void *)pArena->base );
 384             else
 385                 HeapFree( GetProcessHeap(), 0, ptr );
 386             SELECTOR_FreeBlock( sel );
 387             memset( pArena, 0, sizeof(GLOBALARENA) );
 388         }
 389         return 0;
 390     }
 391     ptr = newptr;
 392
 393       /* Reallocate the selector(s) */
 394
 395     sel = SELECTOR_ReallocBlock( sel, ptr, size );
 396     if (!sel)
 397     {
 398         if (pArena->flags & GA_DOSMEM)
 399             DOSMEM_FreeBlock( (void *)pArena->base );
 400         else
 401             HeapFree( GetProcessHeap(), 0, ptr );
 402         memset( pArena, 0, sizeof(GLOBALARENA) );
 403         return 0;
 404     }
 405     selcount = (size + 0xffff) / 0x10000;
 406
 407     if (!(pNewArena = GLOBAL_GetArena( sel, selcount )))
 408     {
 409         if (pArena->flags & GA_DOSMEM)
 410             DOSMEM_FreeBlock( (void *)pArena->base );
 411         else
 412             HeapFree( GetProcessHeap(), 0, ptr );
 413         SELECTOR_FreeBlock( sel );
 414         return 0;
 415     }
 416
 417       /* Fill the new arena block
 418          As we may have used HEAP_REALLOC_IN_PLACE_ONLY, areas may overlap*/
 419
 420     if (pNewArena != pArena) memmove( pNewArena, pArena, sizeof(GLOBALARENA) );
 421     pNewArena->base = (DWORD)ptr;
 422     pNewArena->size = GetSelectorLimit16(sel) + 1;
 423     pNewArena->selCount = selcount;
 424     pNewArena->handle = (pNewArena->flags & GA_MOVEABLE) ? sel - 1 : sel;
 425
 426     if (selcount > 1)  /* clear the next arena blocks */
 427         memset( pNewArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 428
 429     if ((oldsize < size) && (flags & GMEM_ZEROINIT))
 430         memset( (char *)ptr + oldsize, 0, size - oldsize );
 431     return pNewArena->handle;
 432 }
 433
 434
 435 /***********************************************************************
 436  *           GlobalFree     (KERNEL.17)
 437  *           GlobalFree16   (KERNEL32.31)
 438  * RETURNS
 439  *      NULL: Success
 440  *      Handle: Failure
 441  */
 442 HGLOBAL16 WINAPI GlobalFree16(
 443                  HGLOBAL16 handle /* [in] Handle of global memory object */
 444 ) {
 445     void *ptr;
 446
 447     if (!VALID_HANDLE(handle)) {
 448         WARN("Invalid handle 0x%04x passed to GlobalFree16!\n",handle);
 449         return 0;
 450     }
 451     ptr = (void *)GET_ARENA_PTR(handle)->base;
 452
 453     TRACE("%04x\n", handle );
 454     if (!GLOBAL_FreeBlock( handle )) return handle;  /* failed */
 455     if (ptr) HeapFree( GetProcessHeap(), 0, ptr );
 456     return 0;
 457 }
 458
 459
 460 /***********************************************************************
 461  *           GlobalLock   (KERNEL.18)
 462  *
 463  * This is the GlobalLock16() function used by 16-bit code.
 464  */
 465 SEGPTR WINAPI WIN16_GlobalLock16( HGLOBAL16 handle )
 466 {
 467     WORD sel = GlobalHandleToSel16( handle );
 468     TRACE("(%04x) -> %08lx\n", handle, MAKELONG( 0, sel ) );
 469
 470     if (handle)
 471     {
 472         if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 473
 474         if (!VALID_HANDLE(handle)) {
 475             WARN("Invalid handle 0x%04x passed to WIN16_GlobalLock16!\n",handle);
 476             sel = 0;
 477         }
 478         else if (!GET_ARENA_PTR(handle)->base)
 479             sel = 0;
 480         else
 481             GET_ARENA_PTR(handle)->lockCount++;
 482     }
 483
 484     CURRENT_STACK16->ecx = sel;  /* selector must be returned in CX as well */
 485     return MAKESEGPTR( sel, 0 );
 486 }
 487
 488
 489 /**********************************************************************
 490  *           K32WOWGlobalLock16         (KERNEL32.60)
 491  */
 492 SEGPTR WINAPI K32WOWGlobalLock16( HGLOBAL16 hMem )
 493 {
 494     return WIN16_GlobalLock16( hMem );
 495 }
 496
 497
 498 /***********************************************************************
 499  *           GlobalLock16   (KERNEL32.25)
 500  *
 501  * This is the GlobalLock16() function used by 32-bit code.
 502  *
 503  * RETURNS
 504  *      Pointer to first byte of memory block
 505  *      NULL: Failure
 506  */
 507 LPVOID WINAPI GlobalLock16(
 508               HGLOBAL16 handle /* [in] Handle of global memory object */
 509 ) {
 510     if (!handle) return 0;
 511     if (!VALID_HANDLE(handle))
 512         return 0;
 513     GET_ARENA_PTR(handle)->lockCount++;
 514     return (LPVOID)GET_ARENA_PTR(handle)->base;
 515 }
 516
 517
 518 /***********************************************************************
 519  *           GlobalUnlock     (KERNEL.19)
 520  *           GlobalUnlock16   (KERNEL32.26)
 521  * NOTES
 522  *      Should the return values be cast to booleans?
 523  *
 524  * RETURNS
 525  *      TRUE: Object is still locked
 526  *      FALSE: Object is unlocked
 527  */
 528 BOOL16 WINAPI GlobalUnlock16(
 529               HGLOBAL16 handle /* [in] Handle of global memory object */
 530 ) {
 531     GLOBALARENA *pArena = GET_ARENA_PTR(handle);
 532     if (!VALID_HANDLE(handle)) {
 533         WARN("Invalid handle 0x%04x passed to GlobalUnlock16!\n",handle);
 534         return 0;
 535     }
 536     TRACE("%04x\n", handle );
 537     if (pArena->lockCount) pArena->lockCount--;
 538     return pArena->lockCount;
 539 }
 540
 541 /***********************************************************************
 542  *     GlobalChangeLockCount               (KERNEL.365)
 543  *
 544  * This is declared as a register function as it has to preserve
 545  * *all* registers, even AX/DX !
 546  *
 547  */
 548 void WINAPI GlobalChangeLockCount16( HGLOBAL16 handle, INT16 delta,
 549                                      CONTEXT86 *context )
 550 {
 551     if ( delta == 1 )
 552         GlobalLock16( handle );
 553     else if ( delta == -1 )
 554         GlobalUnlock16( handle );
 555     else
 556         ERR("(%04X, %d): strange delta value\n", handle, delta );
 557 }
 558
 559 /***********************************************************************
 560  *           GlobalSize     (KERNEL.20)
 561  *           GlobalSize16   (KERNEL32.32)
 562  * RETURNS
 563  *      Size in bytes of object
 564  *      0: Failure
 565  */
 566 DWORD WINAPI GlobalSize16(
 567              HGLOBAL16 handle /* [in] Handle of global memory object */
 568 ) {
 569     TRACE("%04x\n", handle );
 570     if (!handle) return 0;
 571     if (!VALID_HANDLE(handle))
 572         return 0;
 573     return GET_ARENA_PTR(handle)->size;
 574 }
 575
 576
 577 /***********************************************************************
 578  *           GlobalHandle   (KERNEL.21)
 579  * NOTES
 580  *      Why is GlobalHandleToSel used here with the sel as input?
 581  *
 582  * RETURNS
 583  *      Handle: Success
 584  *      NULL: Failure
 585  */
 586 DWORD WINAPI GlobalHandle16(
 587              WORD sel /* [in] Address of global memory block */
 588 ) {
 589     TRACE("%04x\n", sel );
 590     if (!VALID_HANDLE(sel)) {
 591         WARN("Invalid handle 0x%04x passed to GlobalHandle16!\n",sel);
 592         return 0;
 593     }
 594     return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 595 }
 596
 597 /***********************************************************************
 598  *           GlobalHandleNoRIP   (KERNEL.159)
 599  */
 600 DWORD WINAPI GlobalHandleNoRIP16( WORD sel )
 601 {
 602     int i;
 603     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 604         if (pGlobalArena[i].size!=0 && pGlobalArena[i].handle == sel)
 605                 return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 606     }
 607     return 0;
 608 }
 609
 610
 611 /***********************************************************************
 612  *           GlobalFlags     (KERNEL.22)
 613  *
 614  * NOTES
 615  *      Should this return GMEM_INVALID_HANDLE instead of 0 on invalid
 616  *      handle?
 617  *
 618  * RETURNS
 619  *      Value specifying flags and lock count
 620  *      GMEM_INVALID_HANDLE: Invalid handle
 621  */
 622 UINT16 WINAPI GlobalFlags16(
 623               HGLOBAL16 handle /* [in] Handle of global memory object */
 624 ) {
 625     GLOBALARENA *pArena;
 626
 627     TRACE("%04x\n", handle );
 628     if (!VALID_HANDLE(handle)) {
 629         WARN("Invalid handle 0x%04x passed to GlobalFlags16!\n",handle);
 630         return 0;
 631     }
 632     pArena = GET_ARENA_PTR(handle);
 633     return pArena->lockCount |
 634            ((pArena->flags & GA_DISCARDABLE) ? GMEM_DISCARDABLE : 0) |
 635            ((pArena->base == 0) ? GMEM_DISCARDED : 0);
 636 }
 637
 638
 639 /***********************************************************************
 640  *           LockSegment   (KERNEL.23)
 641  */
 642 HGLOBAL16 WINAPI LockSegment16( HGLOBAL16 handle )
 643 {
 644     TRACE("%04x\n", handle );
 645     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 646     if (!VALID_HANDLE(handle)) {
 647         WARN("Invalid handle 0x%04x passed to LockSegment16!\n",handle);
 648         return 0;
 649     }
 650     GET_ARENA_PTR(handle)->lockCount++;
 651     return handle;
 652 }
 653
 654
 655 /***********************************************************************
 656  *           UnlockSegment   (KERNEL.24)
 657  */
 658 void WINAPI UnlockSegment16( HGLOBAL16 handle )
 659 {
 660     TRACE("%04x\n", handle );
 661     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 662     if (!VALID_HANDLE(handle)) {
 663         WARN("Invalid handle 0x%04x passed to UnlockSegment16!\n",handle);
 664         return;
 665     }
 666     GET_ARENA_PTR(handle)->lockCount--;
 667     /* FIXME: this ought to return the lock count in CX (go figure...) */
 668 }
 669
 670
 671 /***********************************************************************
 672  *           GlobalCompact   (KERNEL.25)
 673  */
 674 DWORD WINAPI GlobalCompact16( DWORD desired )
 675 {
 676     return GLOBAL_MAX_ALLOC_SIZE;
 677 }
 678
 679
 680 /***********************************************************************
 681  *           GlobalFreeAll   (KERNEL.26)
 682  */
 683 void WINAPI GlobalFreeAll16( HGLOBAL16 owner )
 684 {
 685     DWORD i;
 686     GLOBALARENA *pArena;
 687
 688     pArena = pGlobalArena;
 689     for (i = 0; i < globalArenaSize; i++, pArena++)
 690     {
 691         if ((pArena->size != 0) && (pArena->hOwner == owner))
 692             GlobalFree16( pArena->handle );
 693     }
 694 }
 695
 696
 697 /***********************************************************************
 698  *           GlobalWire     (KERNEL.111)
 699  *           GlobalWire16   (KERNEL32.29)
 700  */
 701 SEGPTR WINAPI GlobalWire16( HGLOBAL16 handle )
 702 {
 703     return WIN16_GlobalLock16( handle );
 704 }
 705
 706
 707 /***********************************************************************
 708  *           GlobalUnWire     (KERNEL.112)
 709  *           GlobalUnWire16   (KERNEL32.30)
 710  */
 711 BOOL16 WINAPI GlobalUnWire16( HGLOBAL16 handle )
 712 {
 713     return !GlobalUnlock16( handle );
 714 }
 715
 716
 717 /***********************************************************************
 718  *           SetSwapAreaSize   (KERNEL.106)
 719  */
 720 LONG WINAPI SetSwapAreaSize16( WORD size )
 721 {
 722     FIXME("(%d) - stub!\n", size );
 723     return MAKELONG( size, 0xffff );
 724 }
 725
 726
 727 /***********************************************************************
 728  *           GlobalLRUOldest   (KERNEL.163)
 729  */
 730 HGLOBAL16 WINAPI GlobalLRUOldest16( HGLOBAL16 handle )
 731 {
 732     TRACE("%04x\n", handle );
 733     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 734     return handle;
 735 }
 736
 737
 738 /***********************************************************************
 739  *           GlobalLRUNewest   (KERNEL.164)
 740  */
 741 HGLOBAL16 WINAPI GlobalLRUNewest16( HGLOBAL16 handle )
 742 {
 743     TRACE("%04x\n", handle );
 744     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 745     return handle;
 746 }
 747
 748
 749 /***********************************************************************
 750  *           GetFreeSpace   (KERNEL.169)
 751  */
 752 DWORD WINAPI GetFreeSpace16( UINT16 wFlags )
 753 {
 754     MEMORYSTATUS ms;
 755     GlobalMemoryStatus( &ms );
 756     return ms.dwAvailVirtual;
 757 }
 758
 759 /***********************************************************************
 760  *           GlobalDOSAlloc   (KERNEL.184)
 761  * RETURNS
 762  *      Address (HW=Paragraph segment; LW=Selector)
 763  */
 764 DWORD WINAPI GlobalDOSAlloc16(
 765              DWORD size /* [in] Number of bytes to be allocated */
 766 ) {
 767    UINT16    uParagraph;
 768    LPVOID    lpBlock = DOSMEM_GetBlock( size, &uParagraph );
 769
 770    if( lpBlock )
 771    {
 772        HMODULE16 hModule = GetModuleHandle16("KERNEL");
 773        WORD      wSelector;
 774        GLOBALARENA *pArena;
 775
 776        wSelector = GLOBAL_CreateBlock(GMEM_FIXED, lpBlock, size, hModule, WINE_LDT_FLAGS_DATA );
 777        pArena = GET_ARENA_PTR(wSelector);
 778        pArena->flags |= GA_DOSMEM;
 779        return MAKELONG(wSelector,uParagraph);
 780    }
 781    return 0;
 782 }
 783
 784
 785 /***********************************************************************
 786  *           GlobalDOSFree      (KERNEL.185)
 787  * RETURNS
 788  *      NULL: Success
 789  *      sel: Failure
 790  */
 791 WORD WINAPI GlobalDOSFree16(
 792             WORD sel /* [in] Selector */
 793 ) {
 794    DWORD   block = GetSelectorBase(sel);
 795
 796    if( block && block < 0x100000 )
 797    {
 798        LPVOID lpBlock = DOSMEM_MapDosToLinear( block );
 799        if( DOSMEM_FreeBlock( lpBlock ) )
 800            GLOBAL_FreeBlock( sel );
 801        sel = 0;
 802    }
 803    return sel;
 804 }
 805
 806
 807 /***********************************************************************
 808  *           GlobalPageLock   (KERNEL.191)
 809  *           GlobalSmartPageLock(KERNEL.230)
 810  */
 811 WORD WINAPI GlobalPageLock16( HGLOBAL16 handle )
 812 {
 813     TRACE("%04x\n", handle );
 814     if (!VALID_HANDLE(handle)) {
 815         WARN("Invalid handle 0x%04x passed to GlobalPageLock!\n",handle);
 816         return 0;
 817     }
 818     return ++(GET_ARENA_PTR(handle)->pageLockCount);
 819 }
 820
 821
 822 /***********************************************************************
 823  *           GlobalPageUnlock   (KERNEL.192)
 824  *           GlobalSmartPageUnlock(KERNEL.231)
 825  */
 826 WORD WINAPI GlobalPageUnlock16( HGLOBAL16 handle )
 827 {
 828     TRACE("%04x\n", handle );
 829     if (!VALID_HANDLE(handle)) {
 830         WARN("Invalid handle 0x%04x passed to GlobalPageUnlock!\n",handle);
 831         return 0;
 832     }
 833     return --(GET_ARENA_PTR(handle)->pageLockCount);
 834 }
 835
 836
 837 /***********************************************************************
 838  *           GlobalFix     (KERNEL.197)
 839  *           GlobalFix16   (KERNEL32.27)
 840  */
 841 WORD WINAPI GlobalFix16( HGLOBAL16 handle )
 842 {
 843     TRACE("%04x\n", handle );
 844     if (!VALID_HANDLE(handle)) {
 845         WARN("Invalid handle 0x%04x passed to GlobalFix16!\n",handle);
 846         return 0;
 847     }
 848     GET_ARENA_PTR(handle)->lockCount++;
 849
 850     return GlobalHandleToSel16(handle);
 851 }
 852
 853
 854 /***********************************************************************
 855  *           GlobalUnfix     (KERNEL.198)
 856  *           GlobalUnfix16   (KERNEL32.28)
 857  */
 858 void WINAPI GlobalUnfix16( HGLOBAL16 handle )
 859 {
 860     TRACE("%04x\n", handle );
 861     if (!VALID_HANDLE(handle)) {
 862         WARN("Invalid handle 0x%04x passed to GlobalUnfix16!\n",handle);
 863         return;
 864     }
 865     GET_ARENA_PTR(handle)->lockCount--;
 866 }
 867
 868
 869 /***********************************************************************
 870  *           FarSetOwner   (KERNEL.403)
 871  */
 872 void WINAPI FarSetOwner16( HGLOBAL16 handle, HANDLE16 hOwner )
 873 {
 874     if (!VALID_HANDLE(handle)) {
 875         WARN("Invalid handle 0x%04x passed to FarSetOwner!\n",handle);
 876         return;
 877     }
 878     GET_ARENA_PTR(handle)->hOwner = hOwner;
 879 }
 880
 881
 882 /***********************************************************************
 883  *           FarGetOwner   (KERNEL.404)
 884  */
 885 HANDLE16 WINAPI FarGetOwner16( HGLOBAL16 handle )
 886 {
 887     if (!VALID_HANDLE(handle)) {
 888         WARN("Invalid handle 0x%04x passed to FarGetOwner!\n",handle);
 889         return 0;
 890     }
 891     return GET_ARENA_PTR(handle)->hOwner;
 892 }
 893
 894
 895 /***********************************************************************
 896  *           GlobalHandleToSel   (TOOLHELP.50)
 897  */
 898 WORD WINAPI GlobalHandleToSel16( HGLOBAL16 handle )
 899 {
 900     if (!handle) return 0;
 901     if (!VALID_HANDLE(handle)) {
 902         WARN("Invalid handle 0x%04x passed to GlobalHandleToSel!\n",handle);
 903         return 0;
 904     }
 905     if (!(handle & 7))
 906     {
 907         WARN("Program attempted invalid selector conversion\n" );
 908         return handle - 1;
 909     }
 910     return handle | 7;
 911 }
 912
 913
 914 /***********************************************************************
 915  *           GlobalFirst   (TOOLHELP.51)
 916  */
 917 BOOL16 WINAPI GlobalFirst16( GLOBALENTRY *pGlobal, WORD wFlags )
 918 {
 919     if (wFlags == GLOBAL_LRU) return FALSE;
 920     pGlobal->dwNext = 0;
 921     return GlobalNext16( pGlobal, wFlags );
 922 }
 923
 924
 925 /***********************************************************************
 926  *           GlobalNext   (TOOLHELP.52)
 927  */
 928 BOOL16 WINAPI GlobalNext16( GLOBALENTRY *pGlobal, WORD wFlags)
 929 {
 930     GLOBALARENA *pArena;
 931
 932     if (pGlobal->dwNext >= globalArenaSize) return FALSE;
 933     pArena = pGlobalArena + pGlobal->dwNext;
 934     if (wFlags == GLOBAL_FREE)  /* only free blocks */
 935     {
 936         int i;
 937         for (i = pGlobal->dwNext; i < globalArenaSize; i++, pArena++)
 938             if (pArena->size == 0) break;  /* block is free */
 939         if (i >= globalArenaSize) return FALSE;
 940         pGlobal->dwNext = i;
 941     }
 942
 943     pGlobal->dwAddress    = pArena->base;
 944     pGlobal->dwBlockSize  = pArena->size;
 945     pGlobal->hBlock       = pArena->handle;
 946     pGlobal->wcLock       = pArena->lockCount;
 947     pGlobal->wcPageLock   = pArena->pageLockCount;
 948     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
 949     pGlobal->wHeapPresent = FALSE;
 950     pGlobal->hOwner       = pArena->hOwner;
 951     pGlobal->wType        = GT_UNKNOWN;
 952     pGlobal->wData        = 0;
 953     pGlobal->dwNext++;
 954     return TRUE;
 955 }
 956
 957
 958 /***********************************************************************
 959  *           GlobalInfo   (TOOLHELP.53)
 960  */
 961 BOOL16 WINAPI GlobalInfo16( GLOBALINFO *pInfo )
 962 {
 963     int i;
 964     GLOBALARENA *pArena;
 965
 966     pInfo->wcItems = globalArenaSize;
 967     pInfo->wcItemsFree = 0;
 968     pInfo->wcItemsLRU = 0;
 969     for (i = 0, pArena = pGlobalArena; i < globalArenaSize; i++, pArena++)
 970         if (pArena->size == 0) pInfo->wcItemsFree++;
 971     return TRUE;
 972 }
 973
 974
 975 /***********************************************************************
 976  *           GlobalEntryHandle   (TOOLHELP.54)
 977  */
 978 BOOL16 WINAPI GlobalEntryHandle16( GLOBALENTRY *pGlobal, HGLOBAL16 hItem )
 979 {
 980     GLOBALARENA *pArena = GET_ARENA_PTR(hItem);
 981
 982     pGlobal->dwAddress    = pArena->base;
 983     pGlobal->dwBlockSize  = pArena->size;
 984     pGlobal->hBlock       = pArena->handle;
 985     pGlobal->wcLock       = pArena->lockCount;
 986     pGlobal->wcPageLock   = pArena->pageLockCount;
 987     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
 988     pGlobal->wHeapPresent = FALSE;
 989     pGlobal->hOwner       = pArena->hOwner;
 990     pGlobal->wType        = GT_UNKNOWN;
 991     pGlobal->wData        = 0;
 992     pGlobal->dwNext++;
 993     return TRUE;
 994 }
 995
 996
 997 /***********************************************************************
 998  *           GlobalEntryModule   (TOOLHELP.55)
 999  */
1000 BOOL16 WINAPI GlobalEntryModule16( GLOBALENTRY *pGlobal, HMODULE16 hModule,
1001                                  WORD wSeg )
1002 {
1003     FIXME("(%p, 0x%04x, 0x%04x), stub.\n", pGlobal, hModule, wSeg);
1004     return FALSE;
1005 }
1006
1007
1008 /***********************************************************************
1009  *           MemManInfo   (TOOLHELP.72)
1010  */
1011 BOOL16 WINAPI MemManInfo16( MEMMANINFO *info )
1012 {
1013     MEMORYSTATUS status;
1014
1015     /*
1016      * Not unsurprisingly although the documention says you
1017      * _must_ provide the size in the dwSize field, this function
1018      * (under Windows) always fills the structure and returns true.
1019      */
1020     GlobalMemoryStatus( &status );
1021     info->wPageSize            = getpagesize();
1022     info->dwLargestFreeBlock   = status.dwAvailVirtual;
1023     info->dwMaxPagesAvailable  = info->dwLargestFreeBlock / info->wPageSize;
1024     info->dwMaxPagesLockable   = info->dwMaxPagesAvailable;
1025     info->dwTotalLinearSpace   = status.dwTotalVirtual / info->wPageSize;
1026     info->dwTotalUnlockedPages = info->dwTotalLinearSpace;
1027     info->dwFreePages          = info->dwMaxPagesAvailable;
1028     info->dwTotalPages         = info->dwTotalLinearSpace;
1029     info->dwFreeLinearSpace    = info->dwMaxPagesAvailable;
1030     info->dwSwapFilePages      = status.dwTotalPageFile / info->wPageSize;
1031     return TRUE;
1032 }
1033
1034 /***********************************************************************
1035  *           GetFreeMemInfo   (KERNEL.316)
1036  */
1037 DWORD WINAPI GetFreeMemInfo16(void)
1038 {
1039     MEMMANINFO info;
1040     MemManInfo16( &info );
1041     return MAKELONG( info.dwTotalLinearSpace, info.dwMaxPagesAvailable );
1042 }
1043
1044 /*
1045  * Win32 Global heap functions (GlobalXXX).
1046  * These functions included in Win32 for compatibility with 16 bit Windows
1047  * Especially the moveable blocks and handles are oldish.
1048  * But the ability to directly allocate memory with GPTR and LPTR is widely
1049  * used.
1050  *
1051  * The handle stuff looks horrible, but it's implemented almost like Win95
1052  * does it.
1053  *
1054  */
1055
1056 #define MAGIC_GLOBAL_USED 0x5342
1057 #define GLOBAL_LOCK_MAX   0xFF
1058 #define HANDLE_TO_INTERN(h)  ((PGLOBAL32_INTERN)(((char *)(h))-2))
1059 #define INTERN_TO_HANDLE(i)  ((HGLOBAL) &((i)->Pointer))
1060 #define POINTER_TO_HANDLE(p) (*(((HGLOBAL *)(p))-2))
1061 #define ISHANDLE(h)          (((DWORD)(h)&2)!=0)
1062 #define ISPOINTER(h)         (((DWORD)(h)&2)==0)
1063 /* allign the storage needed for the HGLOBAL on an 8byte boundary thus
1064  * GlobalAlloc/GlobalReAlloc'ing with GMEM_MOVEABLE of memory with
1065  * size = 8*k, where k=1,2,3,... alloc's exactly the given size.
1066  * The Minolta DiMAGE Image Viewer heavily relies on this, corrupting
1067  * the output jpeg's > 1 MB if not */
1068 #define HGLOBAL_STORAGE      8  /* sizeof(HGLOBAL)*2 */
1069
1070 typedef struct __GLOBAL32_INTERN
1071 {
1072    WORD         Magic;
1073    LPVOID       Pointer WINE_PACKED;
1074    BYTE         Flags;
1075    BYTE         LockCount;
1076 } GLOBAL32_INTERN, *PGLOBAL32_INTERN;
1077
1078
1079 /***********************************************************************
1080  *           GlobalAlloc   (KERNEL32.@)
1081  * RETURNS
1082  *      Handle: Success
1083  *      NULL: Failure
1084  */
1085 HGLOBAL WINAPI GlobalAlloc(
1086                  UINT flags, /* [in] Object allocation attributes */
1087                  SIZE_T size /* [in] Number of bytes to allocate */
1088 ) {
1089    PGLOBAL32_INTERN     pintern;
1090    DWORD                hpflags;
1091    LPVOID               palloc;
1092
1093    if(flags&GMEM_ZEROINIT)
1094       hpflags=HEAP_ZERO_MEMORY;
1095    else
1096       hpflags=0;
1097
1098    TRACE("() flags=%04x\n",  flags );
1099
1100    if((flags & GMEM_MOVEABLE)==0) /* POINTER */
1101    {
1102       palloc=HeapAlloc(GetProcessHeap(), hpflags, size);
1103       return (HGLOBAL) palloc;
1104    }
1105    else  /* HANDLE */
1106    {
1107       /* HeapLock(heap); */
1108
1109       pintern=HeapAlloc(GetProcessHeap(), 0,  sizeof(GLOBAL32_INTERN));
1110       if (!pintern) return 0;
1111       if(size)
1112       {
1113          if (!(palloc=HeapAlloc(GetProcessHeap(), hpflags, size+HGLOBAL_STORAGE))) {
1114             HeapFree(GetProcessHeap(), 0, pintern);
1115             return 0;
1116          }
1117          *(HGLOBAL *)palloc=INTERN_TO_HANDLE(pintern);
1118          pintern->Pointer=(char *) palloc+HGLOBAL_STORAGE;
1119       }
1120       else
1121          pintern->Pointer=NULL;
1122       pintern->Magic=MAGIC_GLOBAL_USED;
1123       pintern->Flags=flags>>8;
1124       pintern->LockCount=0;
1125
1126       /* HeapUnlock(heap); */
1127
1128       return INTERN_TO_HANDLE(pintern);
1129    }
1130 }
1131
1132
1133 /***********************************************************************
1134  *           GlobalLock   (KERNEL32.@)
1135  * RETURNS
1136  *      Pointer to first byte of block
1137  *      NULL: Failure
1138  */
1139 LPVOID WINAPI GlobalLock(
1140               HGLOBAL hmem /* [in] Handle of global memory object */
1141 ) {
1142    PGLOBAL32_INTERN pintern;
1143    LPVOID           palloc;
1144
1145    if(ISPOINTER(hmem))
1146       return (LPVOID) hmem;
1147
1148    /* HeapLock(GetProcessHeap()); */
1149
1150    pintern=HANDLE_TO_INTERN(hmem);
1151    if(pintern->Magic==MAGIC_GLOBAL_USED)
1152    {
1153       if(pintern->LockCount<GLOBAL_LOCK_MAX)
1154          pintern->LockCount++;
1155       palloc=pintern->Pointer;
1156    }
1157    else
1158    {
1159       WARN("invalid handle\n");
1160       palloc=NULL;
1161       SetLastError(ERROR_INVALID_HANDLE);
1162    }
1163    /* HeapUnlock(GetProcessHeap()); */;
1164    return palloc;
1165 }
1166
1167
1168 /***********************************************************************
1169  *           GlobalUnlock   (KERNEL32.@)
1170  * RETURNS
1171  *      TRUE: Object is still locked
1172  *      FALSE: Object is unlocked
1173  */
1174 BOOL WINAPI GlobalUnlock(
1175               HGLOBAL hmem /* [in] Handle of global memory object */
1176 ) {
1177     PGLOBAL32_INTERN pintern;
1178     BOOL locked;
1179
1180     if (ISPOINTER(hmem)) return FALSE;
1181
1182     __TRY
1183     {
1184         /* HeapLock(GetProcessHeap()); */
1185         pintern=HANDLE_TO_INTERN(hmem);
1186         if(pintern->Magic==MAGIC_GLOBAL_USED)
1187         {
1188             if((pintern->LockCount<GLOBAL_LOCK_MAX)&&(pintern->LockCount>0))
1189                 pintern->LockCount--;
1190
1191             locked = (pintern->LockCount != 0);
1192             if (!locked) SetLastError(NO_ERROR);
1193         }
1194         else
1195         {
1196             WARN("invalid handle\n");
1197             SetLastError(ERROR_INVALID_HANDLE);
1198             locked=FALSE;
1199         }
1200         /* HeapUnlock(GetProcessHeap()); */
1201     }
1202     __EXCEPT(page_fault)
1203     {
1204         ERR("page fault occurred ! Caused by bug ?\n");
1205         SetLastError( ERROR_INVALID_PARAMETER );
1206         return FALSE;
1207     }
1208     __ENDTRY
1209     return locked;
1210 }
1211
1212
1213 /***********************************************************************
1214  *           GlobalHandle   (KERNEL32.@)
1215  * Returns the handle associated with the specified pointer.
1216  *
1217  * RETURNS
1218  *      Handle: Success
1219  *      NULL: Failure
1220  */
1221 HGLOBAL WINAPI GlobalHandle(
1222                  LPCVOID pmem /* [in] Pointer to global memory block */
1223 ) {
1224     HGLOBAL handle;
1225     PGLOBAL32_INTERN  maybe_intern;
1226     LPCVOID test;
1227
1228     if (!pmem)
1229     {
1230         SetLastError( ERROR_INVALID_PARAMETER );
1231         return 0;
1232     }
1233
1234     __TRY
1235     {
1236         handle = 0;
1237
1238         /* note that if pmem is a pointer to a a block allocated by        */
1239         /* GlobalAlloc with GMEM_MOVEABLE then magic test in HeapValidate  */
1240         /* will fail.                                                      */
1241         if (ISPOINTER(pmem)) {
1242             if (HeapValidate( GetProcessHeap(), 0, pmem )) {
1243                 handle = (HGLOBAL)pmem;  /* valid fixed block */
1244                 break;
1245             }
1246             handle = POINTER_TO_HANDLE(pmem);
1247         } else
1248             handle = (HGLOBAL)pmem;
1249
1250         /* Now test handle either passed in or retrieved from pointer */
1251         maybe_intern = HANDLE_TO_INTERN( handle );
1252         if (maybe_intern->Magic == MAGIC_GLOBAL_USED) {
1253             test = maybe_intern->Pointer;
1254             if (HeapValidate( GetProcessHeap(), 0, (char *)test - HGLOBAL_STORAGE ) && /* obj(-handle) valid arena? */
1255                 HeapValidate( GetProcessHeap(), 0, maybe_intern ))  /* intern valid arena? */
1256                 break;  /* valid moveable block */
1257         }
1258         handle = 0;
1259         SetLastError( ERROR_INVALID_HANDLE );
1260     }
1261     __EXCEPT(page_fault)
1262     {
1263         SetLastError( ERROR_INVALID_HANDLE );
1264         return 0;
1265     }
1266     __ENDTRY
1267
1268     return handle;
1269 }
1270
1271
1272 /***********************************************************************
1273  *           GlobalReAlloc   (KERNEL32.@)
1274  * RETURNS
1275  *      Handle: Success
1276  *      NULL: Failure
1277  */
1278 HGLOBAL WINAPI GlobalReAlloc(
1279                  HGLOBAL hmem, /* [in] Handle of global memory object */
1280                  SIZE_T size,  /* [in] New size of block */
1281                  UINT flags    /* [in] How to reallocate object */
1282 ) {
1283    LPVOID               palloc;
1284    HGLOBAL            hnew;
1285    PGLOBAL32_INTERN     pintern;
1286    DWORD heap_flags = (flags & GMEM_ZEROINIT) ? HEAP_ZERO_MEMORY : 0;
1287
1288    hnew = 0;
1289    /* HeapLock(heap); */
1290    if(flags & GMEM_MODIFY) /* modify flags */
1291    {
1292       if( ISPOINTER(hmem) && (flags & GMEM_MOVEABLE))
1293       {
1294          /* make a fixed block moveable
1295           * actually only NT is able to do this. But it's soo simple
1296           */
1297          if (hmem == 0)
1298          {
1299              ERR("GlobalReAlloc32 with null handle!\n");
1300              SetLastError( ERROR_NOACCESS );
1301              return 0;
1302          }
1303          size=HeapSize(GetProcessHeap(), 0, (LPVOID) hmem);
1304          hnew=GlobalAlloc( flags, size);
1305          palloc=GlobalLock(hnew);
1306          memcpy(palloc, (LPVOID) hmem, size);
1307          GlobalUnlock(hnew);
1308          GlobalFree(hmem);
1309       }
1310       else if( ISPOINTER(hmem) &&(flags & GMEM_DISCARDABLE))
1311       {
1312          /* change the flags to make our block "discardable" */
1313          pintern=HANDLE_TO_INTERN(hmem);
1314          pintern->Flags = pintern->Flags | (GMEM_DISCARDABLE >> 8);
1315          hnew=hmem;
1316       }
1317       else
1318       {
1319          SetLastError(ERROR_INVALID_PARAMETER);
1320          hnew = 0;
1321       }
1322    }
1323    else
1324    {
1325       if(ISPOINTER(hmem))
1326       {
1327          /* reallocate fixed memory */
1328          hnew=(HGLOBAL)HeapReAlloc(GetProcessHeap(), heap_flags, (LPVOID) hmem, size);
1329       }
1330       else
1331       {
1332          /* reallocate a moveable block */
1333          pintern=HANDLE_TO_INTERN(hmem);
1334
1335 #if 0
1336 /* Apparently Windows doesn't care whether the handle is locked at this point */
1337 /* See also the same comment in GlobalFree() */
1338          if(pintern->LockCount>1) {
1339             ERR("handle 0x%08lx is still locked, cannot realloc!\n",(DWORD)hmem);
1340             SetLastError(ERROR_INVALID_HANDLE);
1341          } else
1342 #endif
1343          if(size!=0)
1344          {
1345             hnew=hmem;
1346             if(pintern->Pointer)
1347             {
1348                if((palloc = HeapReAlloc(GetProcessHeap(), heap_flags,
1349                                    (char *) pintern->Pointer-HGLOBAL_STORAGE,
1350                                    size+HGLOBAL_STORAGE)) == NULL)
1351                    return 0; /* Block still valid */
1352                pintern->Pointer=(char *) palloc+HGLOBAL_STORAGE;
1353             }
1354             else
1355             {
1356                 if((palloc=HeapAlloc(GetProcessHeap(), heap_flags, size+HGLOBAL_STORAGE))
1357                    == NULL)
1358                     return 0;
1359                *(HGLOBAL *)palloc=hmem;
1360                pintern->Pointer=(char *) palloc+HGLOBAL_STORAGE;
1361             }
1362          }
1363          else
1364          {
1365             if(pintern->Pointer)
1366             {
1367                HeapFree(GetProcessHeap(), 0, (char *) pintern->Pointer-HGLOBAL_STORAGE);
1368                pintern->Pointer=NULL;
1369             }
1370          }
1371       }
1372    }
1373    /* HeapUnlock(heap); */
1374    return hnew;
1375 }
1376
1377
1378 /***********************************************************************
1379  *           GlobalFree   (KERNEL32.@)
1380  * RETURNS
1381  *      NULL: Success
1382  *      Handle: Failure
1383  */
1384 HGLOBAL WINAPI GlobalFree(
1385                  HGLOBAL hmem /* [in] Handle of global memory object */
1386 ) {
1387     PGLOBAL32_INTERN pintern;
1388     HGLOBAL hreturned;
1389
1390     __TRY
1391     {
1392         hreturned = 0;
1393         if(ISPOINTER(hmem)) /* POINTER */
1394         {
1395             if(!HeapFree(GetProcessHeap(), 0, (LPVOID) hmem)) hmem = 0;
1396         }
1397         else  /* HANDLE */
1398         {
1399             /* HeapLock(heap); */
1400             pintern=HANDLE_TO_INTERN(hmem);
1401
1402             if(pintern->Magic==MAGIC_GLOBAL_USED)
1403             {
1404
1405                 /* WIN98 does not make this test. That is you can free a */
1406                 /* block you have not unlocked. Go figure!!              */
1407                 /* if(pintern->LockCount!=0)  */
1408                 /*    SetLastError(ERROR_INVALID_HANDLE);  */
1409
1410                 if(pintern->Pointer)
1411                     if(!HeapFree(GetProcessHeap(), 0, (char *)(pintern->Pointer)-HGLOBAL_STORAGE))
1412                         hreturned=hmem;
1413                 if(!HeapFree(GetProcessHeap(), 0, pintern))
1414                     hreturned=hmem;
1415             }
1416             /* HeapUnlock(heap); */
1417         }
1418     }
1419     __EXCEPT(page_fault)
1420     {
1421         ERR("page fault occurred ! Caused by bug ?\n");
1422         SetLastError( ERROR_INVALID_PARAMETER );
1423         return hmem;
1424     }
1425     __ENDTRY
1426     return hreturned;
1427 }
1428
1429
1430 /***********************************************************************
1431  *           GlobalSize   (KERNEL32.@)
1432  * RETURNS
1433  *      Size in bytes of the global memory object
1434  *      0: Failure
1435  */
1436 SIZE_T WINAPI GlobalSize(
1437              HGLOBAL hmem /* [in] Handle of global memory object */
1438 ) {
1439    DWORD                retval;
1440    PGLOBAL32_INTERN     pintern;
1441
1442    if(ISPOINTER(hmem))
1443    {
1444       retval=HeapSize(GetProcessHeap(), 0,  (LPVOID) hmem);
1445    }
1446    else
1447    {
1448       /* HeapLock(heap); */
1449       pintern=HANDLE_TO_INTERN(hmem);
1450
1451       if(pintern->Magic==MAGIC_GLOBAL_USED)
1452       {
1453         if (!pintern->Pointer) /* handle case of GlobalAlloc( ??,0) */
1454             return 0;
1455          retval=HeapSize(GetProcessHeap(), 0,
1456                          (char *)(pintern->Pointer) - HGLOBAL_STORAGE );
1457          if (retval != (DWORD)-1) retval -= HGLOBAL_STORAGE;
1458       }
1459       else
1460       {
1461          WARN("invalid handle\n");
1462          retval=0;
1463       }
1464       /* HeapUnlock(heap); */
1465    }
1466    /* HeapSize returns 0xffffffff on failure */
1467    if (retval == 0xffffffff) retval = 0;
1468    return retval;
1469 }
1470
1471
1472 /***********************************************************************
1473  *           GlobalWire   (KERNEL32.@)
1474  */
1475 LPVOID WINAPI GlobalWire(HGLOBAL hmem)
1476 {
1477    return GlobalLock( hmem );
1478 }
1479
1480
1481 /***********************************************************************
1482  *           GlobalUnWire   (KERNEL32.@)
1483  */
1484 BOOL WINAPI GlobalUnWire(HGLOBAL hmem)
1485 {
1486    return GlobalUnlock( hmem);
1487 }
1488
1489
1490 /***********************************************************************
1491  *           GlobalFix   (KERNEL32.@)
1492  */
1493 VOID WINAPI GlobalFix(HGLOBAL hmem)
1494 {
1495     GlobalLock( hmem );
1496 }
1497
1498
1499 /***********************************************************************
1500  *           GlobalUnfix   (KERNEL32.@)
1501  */
1502 VOID WINAPI GlobalUnfix(HGLOBAL hmem)
1503 {
1504    GlobalUnlock( hmem);
1505 }
1506
1507
1508 /***********************************************************************
1509  *           GlobalFlags   (KERNEL32.@)
1510  * Returns information about the specified global memory object
1511  *
1512  * NOTES
1513  *      Should this return GMEM_INVALID_HANDLE on invalid handle?
1514  *
1515  * RETURNS
1516  *      Value specifying allocation flags and lock count
1517  *      GMEM_INVALID_HANDLE: Failure
1518  */
1519 UINT WINAPI GlobalFlags(
1520               HGLOBAL hmem /* [in] Handle to global memory object */
1521 ) {
1522    DWORD                retval;
1523    PGLOBAL32_INTERN     pintern;
1524
1525    if(ISPOINTER(hmem))
1526    {
1527       retval=0;
1528    }
1529    else
1530    {
1531       /* HeapLock(GetProcessHeap()); */
1532       pintern=HANDLE_TO_INTERN(hmem);
1533       if(pintern->Magic==MAGIC_GLOBAL_USED)
1534       {
1535          retval=pintern->LockCount + (pintern->Flags<<8);
1536          if(pintern->Pointer==0)
1537             retval|= GMEM_DISCARDED;
1538       }
1539       else
1540       {
1541          WARN("Invalid handle: %p\n", hmem);
1542          retval=0;
1543       }
1544       /* HeapUnlock(GetProcessHeap()); */
1545    }
1546    return retval;
1547 }
1548
1549
1550 /***********************************************************************
1551  *           GlobalCompact   (KERNEL32.@)
1552  */
1553 SIZE_T WINAPI GlobalCompact( DWORD minfree )
1554 {
1555     return 0;  /* GlobalCompact does nothing in Win32 */
1556 }
1557
1558
1559 /***********************************************************************
1560  *           GlobalMemoryStatus   (KERNEL32.@)
1561  * Provides information about the status of the memory, so apps can tell
1562  * roughly how much they are able to allocate
1563  *
1564  * RETURNS
1565  *      None
1566  */
1567 VOID WINAPI GlobalMemoryStatus(
1568             LPMEMORYSTATUS lpmem
1569 ) {
1570     static MEMORYSTATUS cached_memstatus;
1571     static int cache_lastchecked = 0;
1572     SYSTEM_INFO si;
1573 #ifdef linux
1574     FILE *f;
1575 #endif
1576 #if defined(__FreeBSD__) || defined(__NetBSD__)
1577     int *tmp;
1578     int size_sys;
1579     int mib[2] = { CTL_HW };
1580 #endif
1581     if (time(NULL)==cache_lastchecked) {
1582         memcpy(lpmem,&cached_memstatus,sizeof(MEMORYSTATUS));
1583         return;
1584     }
1585     cache_lastchecked = time(NULL);
1586
1587     lpmem->dwMemoryLoad    = 0;
1588     lpmem->dwTotalPhys     = 16*1024*1024;
1589     lpmem->dwAvailPhys     = 16*1024*1024;
1590     lpmem->dwTotalPageFile = 16*1024*1024;
1591     lpmem->dwAvailPageFile = 16*1024*1024;
1592
1593 #ifdef linux
1594     f = fopen( "/proc/meminfo", "r" );
1595     if (f)
1596     {
1597         char buffer[256];
1598         int total, used, free, shared, buffers, cached;
1599
1600         lpmem->dwLength = sizeof(MEMORYSTATUS);
1601         lpmem->dwTotalPhys = lpmem->dwAvailPhys = 0;
1602         lpmem->dwTotalPageFile = lpmem->dwAvailPageFile = 0;
1603         while (fgets( buffer, sizeof(buffer), f ))
1604         {
1605             /* old style /proc/meminfo ... */
1606             if (sscanf( buffer, "Mem: %d %d %d %d %d %d", &total, &used, &free, &shared, &buffers, &cached ))
1607             {
1608                 lpmem->dwTotalPhys += total;
1609                 lpmem->dwAvailPhys += free + buffers + cached;
1610             }
1611             if (sscanf( buffer, "Swap: %d %d %d", &total, &used, &free ))
1612             {
1613                 lpmem->dwTotalPageFile += total;
1614                 lpmem->dwAvailPageFile += free;
1615             }
1616
1617             /* new style /proc/meminfo ... */
1618             if (sscanf(buffer, "MemTotal: %d", &total))
1619                 lpmem->dwTotalPhys = total*1024;
1620             if (sscanf(buffer, "MemFree: %d", &free))
1621                 lpmem->dwAvailPhys = free*1024;
1622             if (sscanf(buffer, "SwapTotal: %d", &total))
1623                 lpmem->dwTotalPageFile = total*1024;
1624             if (sscanf(buffer, "SwapFree: %d", &free))
1625                 lpmem->dwAvailPageFile = free*1024;
1626             if (sscanf(buffer, "Buffers: %d", &buffers))
1627                 lpmem->dwAvailPhys += buffers*1024;
1628             if (sscanf(buffer, "Cached: %d", &cached))
1629                 lpmem->dwAvailPhys += cached*1024;
1630         }
1631         fclose( f );
1632
1633         if (lpmem->dwTotalPhys)
1634         {
1635             DWORD TotalPhysical = lpmem->dwTotalPhys+lpmem->dwTotalPageFile;
1636             DWORD AvailPhysical = lpmem->dwAvailPhys+lpmem->dwAvailPageFile;
1637             lpmem->dwMemoryLoad = (TotalPhysical-AvailPhysical)
1638                                       / (TotalPhysical / 100);
1639         }
1640     }
1641 #elif defined(__FreeBSD__) || defined(__NetBSD__)
1642     mib[1] = HW_PHYSMEM;
1643     sysctl(mib, 2, NULL, &size_sys, NULL, 0);
1644     tmp = malloc(size_sys * sizeof(int));
1645     sysctl(mib, 2, tmp, &size_sys, NULL, 0);
1646     if (tmp && *tmp)
1647     {
1648         lpmem->dwTotalPhys = *tmp;
1649         free(tmp);
1650         mib[1] = HW_USERMEM;
1651         sysctl(mib, 2, NULL, &size_sys, NULL, 0);
1652         tmp = malloc(size_sys * sizeof(int));
1653         sysctl(mib, 2, tmp, &size_sys, NULL, 0);
1654         if (tmp && *tmp)
1655         {
1656             lpmem->dwAvailPhys = *tmp;
1657             lpmem->dwTotalPageFile = *tmp;
1658             lpmem->dwAvailPageFile = *tmp;
1659             lpmem->dwMemoryLoad = lpmem->dwTotalPhys - lpmem->dwAvailPhys;
1660         } else
1661         {
1662             lpmem->dwAvailPhys = lpmem->dwTotalPhys;
1663             lpmem->dwTotalPageFile = lpmem->dwTotalPhys;
1664             lpmem->dwAvailPageFile = lpmem->dwTotalPhys;
1665             lpmem->dwMemoryLoad = 0;
1666         }
1667         free(tmp);
1668
1669     }
1670 #endif
1671     /* Some applications (e.g. QuickTime 6) crash if we tell them there
1672      * is more than 2GB of physical memory.
1673      */
1674     if (lpmem->dwTotalPhys>2U*1024*1024*1024)
1675     {
1676         lpmem->dwTotalPhys=2U*1024*1024*1024;
1677         lpmem->dwAvailPhys=2U*1024*1024*1024;
1678     }
1679
1680     /* FIXME: should do something for other systems */
1681     GetSystemInfo(&si);
1682     lpmem->dwTotalVirtual  = (char*)si.lpMaximumApplicationAddress-(char*)si.lpMinimumApplicationAddress;
1683     /* FIXME: we should track down all the already allocated VM pages and substract them, for now arbitrarily remove 64KB so that it matches NT */
1684     lpmem->dwAvailVirtual  = lpmem->dwTotalVirtual-64*1024;
1685     memcpy(&cached_memstatus,lpmem,sizeof(MEMORYSTATUS));
1686
1687     /* it appears some memory display programs want to divide by these values */
1688     if(lpmem->dwTotalPageFile==0)
1689         lpmem->dwTotalPageFile++;
1690
1691     if(lpmem->dwAvailPageFile==0)
1692         lpmem->dwAvailPageFile++;
1693
1694     TRACE("<-- LPMEMORYSTATUS: dwLength %ld, dwMemoryLoad %ld, dwTotalPhys %ld, dwAvailPhys %ld,"
1695           " dwTotalPageFile %ld, dwAvailPageFile %ld, dwTotalVirtual %ld, dwAvailVirtual %ld\n",
1696           lpmem->dwLength, lpmem->dwMemoryLoad, lpmem->dwTotalPhys, lpmem->dwAvailPhys,
1697           lpmem->dwTotalPageFile, lpmem->dwAvailPageFile, lpmem->dwTotalVirtual,
1698           lpmem->dwAvailVirtual);
1699 }
1700
1701 /***********************************************************************
1702  *           GlobalMemoryStatusEx   (KERNEL32.@)
1703  * A version of GlobalMemoryStatus that can deal with memory over 4GB
1704  *
1705  * RETURNS
1706  *      None
1707  */
1708 BOOL WINAPI GlobalMemoryStatusEx( LPMEMORYSTATUSEX lpBuffer ) {
1709   MEMORYSTATUS memstatus;
1710
1711   /* Because GlobalMemoryStatusEx is identical to GlobalMemoryStatus save
1712      for one extra field in the struct, and the lack of a bug, we simply
1713      call GlobalMemoryStatus and copy the values across. */
1714   FIXME("we should emulate the 4GB bug here, as per MSDN\n");
1715   GlobalMemoryStatus(&memstatus);
1716   lpBuffer->dwMemoryLoad = memstatus.dwMemoryLoad;
1717   lpBuffer->ullTotalPhys = memstatus.dwTotalPhys;
1718   lpBuffer->ullAvailPhys = memstatus.dwAvailPhys;
1719   lpBuffer->ullTotalPageFile = memstatus.dwTotalPageFile;
1720   lpBuffer->ullAvailPageFile = memstatus.dwAvailPageFile;
1721   lpBuffer->ullTotalVirtual = memstatus.dwTotalVirtual;
1722   lpBuffer->ullAvailVirtual = memstatus.dwAvailVirtual;
1723   /* MSDN says about AvailExtendedVirtual: Size of unreserved and uncommitted
1724      memory in the extended portion of the virtual address space of the calling
1725      process, in bytes.
1726
1727      However, I don't know what this means, so set it to zero :(
1728   */
1729   lpBuffer->ullAvailExtendedVirtual = 0;
1730   return 1;
1731 }
1732
1733 /***********************************************************************
1734  *           A20Proc   (KERNEL.165)
1735  *           A20_Proc  (SYSTEM.20)
1736  */
1737 void WINAPI A20Proc16( WORD unused )
1738 {
1739     /* this is also a NOP in Windows */
1740 }
1741
1742 /***********************************************************************
1743  *           LimitEMSPages   (KERNEL.156)
1744  */
1745 DWORD WINAPI LimitEMSPages16( DWORD unused )
1746 {
1747     return 0;
1748 }