memory/global.c

   1 /*
   2  * Global heap functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6 /* 0xffff sometimes seems to mean: CURRENT_DS */
   7
   8 #include <sys/types.h>
   9 #include <stdlib.h>
  10 #include <time.h>
  11 #include <stdio.h>
  12 #include <unistd.h>
  13 #include <string.h>
  14
  15 #include "wine/winbase16.h"
  16 #include "wine/exception.h"
  17 #include "wine/port.h"
  18 #include "global.h"
  19 #include "heap.h"
  20 #include "toolhelp.h"
  21 #include "selectors.h"
  22 #include "miscemu.h"
  23 #include "stackframe.h"
  24 #include "module.h"
  25 #include "debugtools.h"
  26 #include "winerror.h"
  27
  28 DEFAULT_DEBUG_CHANNEL(global);
  29
  30   /* Global arena block */
  31 typedef struct
  32 {
  33     DWORD     base;          /* Base address (0 if discarded) */
  34     DWORD     size;          /* Size in bytes (0 indicates a free block) */
  35     HGLOBAL16 handle;        /* Handle for this block */
  36     HGLOBAL16 hOwner;        /* Owner of this block */
  37     BYTE      lockCount;     /* Count of GlobalFix() calls */
  38     BYTE      pageLockCount; /* Count of GlobalPageLock() calls */
  39     BYTE      flags;         /* Allocation flags */
  40     BYTE      selCount;      /* Number of selectors allocated for this block */
  41 } GLOBALARENA;
  42
  43   /* Flags definitions */
  44 #define GA_MOVEABLE     0x02  /* same as GMEM_MOVEABLE */
  45 #define GA_DGROUP       0x04
  46 #define GA_DISCARDABLE  0x08
  47 #define GA_IPCSHARE     0x10  /* same as GMEM_DDESHARE */
  48 #define GA_DOSMEM       0x20
  49
  50   /* Arena array */
  51 static GLOBALARENA *pGlobalArena = NULL;
  52 static int globalArenaSize = 0;
  53
  54 #define GLOBAL_MAX_ALLOC_SIZE 0x00ff0000  /* Largest allocation is 16M - 64K */
  55
  56 #define VALID_HANDLE(handle) (((handle)>>__AHSHIFT)<globalArenaSize)
  57 #define GET_ARENA_PTR(handle)  (pGlobalArena + ((handle) >> __AHSHIFT))
  58
  59 /* filter for page-fault exceptions */
  60 /* It is possible for a bogus global pointer to cause a */
  61 /* page zero reference, so I include EXCEPTION_PRIV_INSTRUCTION too. */
  62
  63 static WINE_EXCEPTION_FILTER(page_fault)
  64 {
  65     switch (GetExceptionCode()) {
  66         case (EXCEPTION_ACCESS_VIOLATION):
  67         case (EXCEPTION_PRIV_INSTRUCTION):
  68            return EXCEPTION_EXECUTE_HANDLER;
  69         default:
  70            return EXCEPTION_CONTINUE_SEARCH;
  71     }
  72 }
  73
  74 /***********************************************************************
  75  *           GLOBAL_GetArena
  76  *
  77  * Return the arena for a given selector, growing the arena array if needed.
  78  */
  79 static GLOBALARENA *GLOBAL_GetArena( WORD sel, WORD selcount )
  80 {
  81     if (((sel >> __AHSHIFT) + selcount) > globalArenaSize)
  82     {
  83         int newsize = ((sel >> __AHSHIFT) + selcount + 0xff) & ~0xff;
  84         GLOBALARENA *pNewArena = realloc( pGlobalArena,
  85                                           newsize * sizeof(GLOBALARENA) );
  86         if (!pNewArena) return 0;
  87         pGlobalArena = pNewArena;
  88         memset( pGlobalArena + globalArenaSize, 0,
  89                 (newsize - globalArenaSize) * sizeof(GLOBALARENA) );
  90         globalArenaSize = newsize;
  91     }
  92     return pGlobalArena + (sel >> __AHSHIFT);
  93 }
  94
  95 void debug_handles(void)
  96 {
  97     int printed=0;
  98     int i;
  99     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 100         if (pGlobalArena[i].size!=0 && (pGlobalArena[i].handle & 0x8000)){
 101             printed=1;
 102             DPRINTF("0x%08x, ",pGlobalArena[i].handle);
 103         }
 104     }
 105     if (printed)
 106         DPRINTF("\n");
 107 }
 108
 109
 110 /***********************************************************************
 111  *           GLOBAL_CreateBlock
 112  *
 113  * Create a global heap block for a fixed range of linear memory.
 114  */
 115 HGLOBAL16 GLOBAL_CreateBlock( WORD flags, const void *ptr, DWORD size,
 116                               HGLOBAL16 hOwner, unsigned char selflags )
 117 {
 118     WORD sel, selcount;
 119     GLOBALARENA *pArena;
 120
 121       /* Allocate the selector(s) */
 122
 123     sel = SELECTOR_AllocBlock( ptr, size, selflags );
 124     if (!sel) return 0;
 125     selcount = (size + 0xffff) / 0x10000;
 126
 127     if (!(pArena = GLOBAL_GetArena( sel, selcount )))
 128     {
 129         SELECTOR_FreeBlock( sel );
 130         return 0;
 131     }
 132
 133       /* Fill the arena block */
 134
 135     pArena->base = (DWORD)ptr;
 136     pArena->size = GetSelectorLimit16(sel) + 1;
 137     pArena->handle = (flags & GMEM_MOVEABLE) ? sel - 1 : sel;
 138     pArena->hOwner = hOwner;
 139     pArena->lockCount = 0;
 140     pArena->pageLockCount = 0;
 141     pArena->flags = flags & GA_MOVEABLE;
 142     if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 143     if (flags & GMEM_DDESHARE) pArena->flags |= GA_IPCSHARE;
 144     if (!(selflags & (WINE_LDT_FLAGS_CODE^WINE_LDT_FLAGS_DATA))) pArena->flags |= GA_DGROUP;
 145     pArena->selCount = selcount;
 146     if (selcount > 1)  /* clear the next arena blocks */
 147         memset( pArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 148
 149     return pArena->handle;
 150 }
 151
 152
 153 /***********************************************************************
 154  *           GLOBAL_FreeBlock
 155  *
 156  * Free a block allocated by GLOBAL_CreateBlock, without touching
 157  * the associated linear memory range.
 158  */
 159 BOOL16 GLOBAL_FreeBlock( HGLOBAL16 handle )
 160 {
 161     WORD sel;
 162     GLOBALARENA *pArena;
 163
 164     if (!handle) return TRUE;
 165     sel = GlobalHandleToSel16( handle );
 166     if (!VALID_HANDLE(sel))
 167         return FALSE;
 168     pArena = GET_ARENA_PTR(sel);
 169     SELECTOR_FreeBlock( sel );
 170     memset( pArena, 0, sizeof(GLOBALARENA) );
 171     return TRUE;
 172 }
 173
 174 /***********************************************************************
 175  *           GLOBAL_MoveBlock
 176  */
 177 BOOL16 GLOBAL_MoveBlock( HGLOBAL16 handle, const void *ptr, DWORD size )
 178 {
 179     WORD sel;
 180     GLOBALARENA *pArena;
 181
 182     if (!handle) return TRUE;
 183     sel = GlobalHandleToSel16( handle );
 184     if (!VALID_HANDLE(sel))
 185         return FALSE;
 186     pArena = GET_ARENA_PTR(sel);
 187     if (pArena->selCount != 1)
 188         return FALSE;
 189
 190     pArena->base = (DWORD)ptr;
 191     pArena->size = size;
 192     SELECTOR_ReallocBlock( sel, ptr, size );
 193     return TRUE;
 194 }
 195
 196 /***********************************************************************
 197  *           GLOBAL_Alloc
 198  *
 199  * Implementation of GlobalAlloc16()
 200  */
 201 HGLOBAL16 GLOBAL_Alloc( UINT16 flags, DWORD size, HGLOBAL16 hOwner, unsigned char selflags )
 202 {
 203     void *ptr;
 204     HGLOBAL16 handle;
 205
 206     TRACE("%ld flags=%04x\n", size, flags );
 207
 208     /* If size is 0, create a discarded block */
 209
 210     if (size == 0) return GLOBAL_CreateBlock( flags, NULL, 1, hOwner, selflags );
 211
 212     /* Fixup the size */
 213
 214     if (size >= GLOBAL_MAX_ALLOC_SIZE - 0x1f) return 0;
 215     size = (size + 0x1f) & ~0x1f;
 216
 217     /* Allocate the linear memory */
 218     ptr = HeapAlloc( GetProcessHeap(), 0, size );
 219       /* FIXME: free discardable blocks and try again? */
 220     if (!ptr) return 0;
 221
 222       /* Allocate the selector(s) */
 223
 224     handle = GLOBAL_CreateBlock( flags, ptr, size, hOwner, selflags );
 225     if (!handle)
 226     {
 227         HeapFree( GetProcessHeap(), 0, ptr );
 228         return 0;
 229     }
 230
 231     if (flags & GMEM_ZEROINIT) memset( ptr, 0, size );
 232     return handle;
 233 }
 234
 235 /***********************************************************************
 236  *           GlobalAlloc16   (KERNEL.15)
 237  * RETURNS
 238  *      Handle: Success
 239  *      NULL: Failure
 240  */
 241 HGLOBAL16 WINAPI GlobalAlloc16(
 242                  UINT16 flags, /* [in] Object allocation attributes */
 243                  DWORD size    /* [in] Number of bytes to allocate */
 244 ) {
 245     HANDLE16 owner = GetCurrentPDB16();
 246
 247     if (flags & GMEM_DDESHARE)
 248         owner = GetExePtr(owner);  /* Make it a module handle */
 249     return GLOBAL_Alloc( flags, size, owner, WINE_LDT_FLAGS_DATA );
 250 }
 251
 252
 253 /***********************************************************************
 254  *           GlobalReAlloc16   (KERNEL.16)
 255  * RETURNS
 256  *      Handle: Success
 257  *      NULL: Failure
 258  */
 259 HGLOBAL16 WINAPI GlobalReAlloc16(
 260                  HGLOBAL16 handle, /* [in] Handle of global memory object */
 261                  DWORD size,       /* [in] New size of block */
 262                  UINT16 flags      /* [in] How to reallocate object */
 263 ) {
 264     WORD selcount;
 265     DWORD oldsize;
 266     void *ptr;
 267     GLOBALARENA *pArena, *pNewArena;
 268     WORD sel = GlobalHandleToSel16( handle );
 269
 270     TRACE("%04x %ld flags=%04x\n",
 271                     handle, size, flags );
 272     if (!handle) return 0;
 273
 274     if (!VALID_HANDLE(handle)) {
 275         WARN("Invalid handle 0x%04x!\n", handle);
 276         return 0;
 277     }
 278     pArena = GET_ARENA_PTR( handle );
 279
 280       /* Discard the block if requested */
 281
 282     if ((size == 0) && (flags & GMEM_MOVEABLE) && !(flags & GMEM_MODIFY))
 283     {
 284         if (!(pArena->flags & GA_MOVEABLE) ||
 285             !(pArena->flags & GA_DISCARDABLE) ||
 286             (pArena->lockCount > 0) || (pArena->pageLockCount > 0)) return 0;
 287         HeapFree( GetProcessHeap(), 0, (void *)pArena->base );
 288         pArena->base = 0;
 289
 290         /* Note: we rely on the fact that SELECTOR_ReallocBlock won't
 291          * change the selector if we are shrinking the block.
 292          * FIXME: shouldn't we keep selectors until the block is deleted?
 293          */
 294         SELECTOR_ReallocBlock( sel, 0, 1 );
 295         return handle;
 296     }
 297
 298       /* Fixup the size */
 299
 300     if (size > GLOBAL_MAX_ALLOC_SIZE - 0x20) return 0;
 301     if (size == 0) size = 0x20;
 302     else size = (size + 0x1f) & ~0x1f;
 303
 304       /* Change the flags */
 305
 306     if (flags & GMEM_MODIFY)
 307     {
 308           /* Change the flags, leaving GA_DGROUP alone */
 309         pArena->flags = (pArena->flags & GA_DGROUP) | (flags & GA_MOVEABLE);
 310         if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 311         return handle;
 312     }
 313
 314       /* Reallocate the linear memory */
 315
 316     ptr = (void *)pArena->base;
 317     oldsize = pArena->size;
 318     TRACE("oldsize %08lx\n",oldsize);
 319     if (ptr && (size == oldsize)) return handle;  /* Nothing to do */
 320
 321     if (pArena->flags & GA_DOSMEM)
 322         ptr = DOSMEM_ResizeBlock(ptr, size, NULL);
 323     else
 324         ptr = HeapReAlloc( GetProcessHeap(), 0, ptr, size );
 325     if (!ptr)
 326     {
 327         SELECTOR_FreeBlock( sel );
 328         memset( pArena, 0, sizeof(GLOBALARENA) );
 329         return 0;
 330     }
 331
 332       /* Reallocate the selector(s) */
 333
 334     sel = SELECTOR_ReallocBlock( sel, ptr, size );
 335     if (!sel)
 336     {
 337         HeapFree( GetProcessHeap(), 0, ptr );
 338         memset( pArena, 0, sizeof(GLOBALARENA) );
 339         return 0;
 340     }
 341     selcount = (size + 0xffff) / 0x10000;
 342
 343     if (!(pNewArena = GLOBAL_GetArena( sel, selcount )))
 344     {
 345         HeapFree( GetProcessHeap(), 0, ptr );
 346         SELECTOR_FreeBlock( sel );
 347         return 0;
 348     }
 349
 350       /* Fill the new arena block */
 351
 352     if (pNewArena != pArena) memcpy( pNewArena, pArena, sizeof(GLOBALARENA) );
 353     pNewArena->base = (DWORD)ptr;
 354     pNewArena->size = GetSelectorLimit16(sel) + 1;
 355     pNewArena->selCount = selcount;
 356     pNewArena->handle = (pNewArena->flags & GA_MOVEABLE) ? sel - 1 : sel;
 357
 358     if (selcount > 1)  /* clear the next arena blocks */
 359         memset( pNewArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 360
 361     if ((oldsize < size) && (flags & GMEM_ZEROINIT))
 362         memset( (char *)ptr + oldsize, 0, size - oldsize );
 363     return pNewArena->handle;
 364 }
 365
 366
 367 /***********************************************************************
 368  *           GlobalFree16   (KERNEL.17)
 369  * RETURNS
 370  *      NULL: Success
 371  *      Handle: Failure
 372  */
 373 HGLOBAL16 WINAPI GlobalFree16(
 374                  HGLOBAL16 handle /* [in] Handle of global memory object */
 375 ) {
 376     void *ptr;
 377
 378     if (!VALID_HANDLE(handle)) {
 379         WARN("Invalid handle 0x%04x passed to GlobalFree16!\n",handle);
 380         return 0;
 381     }
 382     ptr = (void *)GET_ARENA_PTR(handle)->base;
 383
 384     TRACE("%04x\n", handle );
 385     if (!GLOBAL_FreeBlock( handle )) return handle;  /* failed */
 386     if (ptr) HeapFree( GetProcessHeap(), 0, ptr );
 387     return 0;
 388 }
 389
 390
 391 /***********************************************************************
 392  *           WIN16_GlobalLock16   (KERNEL.18)
 393  *
 394  * This is the GlobalLock16() function used by 16-bit code.
 395  */
 396 SEGPTR WINAPI WIN16_GlobalLock16( HGLOBAL16 handle )
 397 {
 398     WORD sel = GlobalHandleToSel16( handle );
 399     TRACE("(%04x) -> %08lx\n", handle, MAKELONG( 0, sel ) );
 400
 401     if (handle)
 402     {
 403         if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 404
 405         if (!VALID_HANDLE(handle)) {
 406             WARN("Invalid handle 0x%04x passed to WIN16_GlobalLock16!\n",handle);
 407             sel = 0;
 408         }
 409         else if (!GET_ARENA_PTR(handle)->base)
 410             sel = 0;
 411         else
 412             GET_ARENA_PTR(handle)->lockCount++;
 413     }
 414
 415     CURRENT_STACK16->ecx = sel;  /* selector must be returned in CX as well */
 416     return MAKESEGPTR( sel, 0 );
 417 }
 418
 419
 420 /**********************************************************************
 421  *           K32WOWGlobalLock16         (WOW32.11) (KERNEL32.60)
 422  */
 423 SEGPTR WINAPI K32WOWGlobalLock16( HGLOBAL16 hMem )
 424 {
 425     return WIN16_GlobalLock16( hMem );
 426 }
 427
 428
 429 /***********************************************************************
 430  *           GlobalLock16   (KERNEL.18)
 431  *
 432  * This is the GlobalLock16() function used by 32-bit code.
 433  *
 434  * RETURNS
 435  *      Pointer to first byte of memory block
 436  *      NULL: Failure
 437  */
 438 LPVOID WINAPI GlobalLock16(
 439               HGLOBAL16 handle /* [in] Handle of global memory object */
 440 ) {
 441     if (!handle) return 0;
 442     if (!VALID_HANDLE(handle))
 443         return (LPVOID)0;
 444     GET_ARENA_PTR(handle)->lockCount++;
 445     return (LPVOID)GET_ARENA_PTR(handle)->base;
 446 }
 447
 448
 449 /***********************************************************************
 450  *           GlobalUnlock16   (KERNEL.19)
 451  * NOTES
 452  *      Should the return values be cast to booleans?
 453  *
 454  * RETURNS
 455  *      TRUE: Object is still locked
 456  *      FALSE: Object is unlocked
 457  */
 458 BOOL16 WINAPI GlobalUnlock16(
 459               HGLOBAL16 handle /* [in] Handle of global memory object */
 460 ) {
 461     GLOBALARENA *pArena = GET_ARENA_PTR(handle);
 462     if (!VALID_HANDLE(handle)) {
 463         WARN("Invalid handle 0x%04x passed to GlobalUnlock16!\n",handle);
 464         return 0;
 465     }
 466     TRACE("%04x\n", handle );
 467     if (pArena->lockCount) pArena->lockCount--;
 468     return pArena->lockCount;
 469 }
 470
 471 /***********************************************************************
 472  *     GlobalChangeLockCount               (KERNEL.365)
 473  *
 474  * This is declared as a register function as it has to preserve
 475  * *all* registers, even AX/DX !
 476  *
 477  */
 478 void WINAPI GlobalChangeLockCount16( HGLOBAL16 handle, INT16 delta,
 479                                      CONTEXT86 *context )
 480 {
 481     if ( delta == 1 )
 482         GlobalLock16( handle );
 483     else if ( delta == -1 )
 484         GlobalUnlock16( handle );
 485     else
 486         ERR("(%04X, %d): strange delta value\n", handle, delta );
 487 }
 488
 489 /***********************************************************************
 490  *           GlobalSize16   (KERNEL.20)
 491  * RETURNS
 492  *      Size in bytes of object
 493  *      0: Failure
 494  */
 495 DWORD WINAPI GlobalSize16(
 496              HGLOBAL16 handle /* [in] Handle of global memory object */
 497 ) {
 498     TRACE("%04x\n", handle );
 499     if (!handle) return 0;
 500     if (!VALID_HANDLE(handle))
 501         return 0;
 502     return GET_ARENA_PTR(handle)->size;
 503 }
 504
 505
 506 /***********************************************************************
 507  *           GlobalHandle16   (KERNEL.21)
 508  * NOTES
 509  *      Why is GlobalHandleToSel used here with the sel as input?
 510  *
 511  * RETURNS
 512  *      Handle: Success
 513  *      NULL: Failure
 514  */
 515 DWORD WINAPI GlobalHandle16(
 516              WORD sel /* [in] Address of global memory block */
 517 ) {
 518     TRACE("%04x\n", sel );
 519     if (!VALID_HANDLE(sel)) {
 520         WARN("Invalid handle 0x%04x passed to GlobalHandle16!\n",sel);
 521         return 0;
 522     }
 523     return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 524 }
 525
 526 /***********************************************************************
 527  *           GlobalHandleNoRIP   (KERNEL.159)
 528  */
 529 DWORD WINAPI GlobalHandleNoRIP16( WORD sel )
 530 {
 531     int i;
 532     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 533         if (pGlobalArena[i].size!=0 && pGlobalArena[i].handle == sel)
 534                 return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 535     }
 536     return 0;
 537 }
 538
 539
 540 /***********************************************************************
 541  *           GlobalFlags16   (KERNEL.22)
 542  * NOTES
 543  *      Should this return GMEM_INVALID_HANDLE instead of 0 on invalid
 544  *      handle?
 545  *
 546  * RETURNS
 547  *      Value specifying flags and lock count
 548  *      GMEM_INVALID_HANDLE: Invalid handle
 549  */
 550 UINT16 WINAPI GlobalFlags16(
 551               HGLOBAL16 handle /* [in] Handle of global memory object */
 552 ) {
 553     GLOBALARENA *pArena;
 554
 555     TRACE("%04x\n", handle );
 556     if (!VALID_HANDLE(handle)) {
 557         WARN("Invalid handle 0x%04x passed to GlobalFlags16!\n",handle);
 558         return 0;
 559     }
 560     pArena = GET_ARENA_PTR(handle);
 561     return pArena->lockCount |
 562            ((pArena->flags & GA_DISCARDABLE) ? GMEM_DISCARDABLE : 0) |
 563            ((pArena->base == 0) ? GMEM_DISCARDED : 0);
 564 }
 565
 566
 567 /***********************************************************************
 568  *           LockSegment16   (KERNEL.23)
 569  */
 570 HGLOBAL16 WINAPI LockSegment16( HGLOBAL16 handle )
 571 {
 572     TRACE("%04x\n", handle );
 573     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 574     if (!VALID_HANDLE(handle)) {
 575         WARN("Invalid handle 0x%04x passed to LockSegment16!\n",handle);
 576         return 0;
 577     }
 578     GET_ARENA_PTR(handle)->lockCount++;
 579     return handle;
 580 }
 581
 582
 583 /***********************************************************************
 584  *           UnlockSegment16   (KERNEL.24)
 585  */
 586 void WINAPI UnlockSegment16( HGLOBAL16 handle )
 587 {
 588     TRACE("%04x\n", handle );
 589     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 590     if (!VALID_HANDLE(handle)) {
 591         WARN("Invalid handle 0x%04x passed to UnlockSegment16!\n",handle);
 592         return;
 593     }
 594     GET_ARENA_PTR(handle)->lockCount--;
 595     /* FIXME: this ought to return the lock count in CX (go figure...) */
 596 }
 597
 598
 599 /***********************************************************************
 600  *           GlobalCompact16   (KERNEL.25)
 601  */
 602 DWORD WINAPI GlobalCompact16( DWORD desired )
 603 {
 604     return GLOBAL_MAX_ALLOC_SIZE;
 605 }
 606
 607
 608 /***********************************************************************
 609  *           GlobalFreeAll   (KERNEL.26)
 610  */
 611 void WINAPI GlobalFreeAll16( HGLOBAL16 owner )
 612 {
 613     DWORD i;
 614     GLOBALARENA *pArena;
 615
 616     pArena = pGlobalArena;
 617     for (i = 0; i < globalArenaSize; i++, pArena++)
 618     {
 619         if ((pArena->size != 0) && (pArena->hOwner == owner))
 620             GlobalFree16( pArena->handle );
 621     }
 622 }
 623
 624
 625 /***********************************************************************
 626  *           GlobalWire16   (KERNEL.111)
 627  */
 628 SEGPTR WINAPI GlobalWire16( HGLOBAL16 handle )
 629 {
 630     return WIN16_GlobalLock16( handle );
 631 }
 632
 633
 634 /***********************************************************************
 635  *           GlobalUnWire16   (KERNEL.112)
 636  */
 637 BOOL16 WINAPI GlobalUnWire16( HGLOBAL16 handle )
 638 {
 639     return !GlobalUnlock16( handle );
 640 }
 641
 642
 643 /***********************************************************************
 644  *           SetSwapAreaSize16   (KERNEL.106)
 645  */
 646 LONG WINAPI SetSwapAreaSize16( WORD size )
 647 {
 648     FIXME("(%d) - stub!\n", size );
 649     return MAKELONG( size, 0xffff );
 650 }
 651
 652
 653 /***********************************************************************
 654  *           GlobalLRUOldest   (KERNEL.163)
 655  */
 656 HGLOBAL16 WINAPI GlobalLRUOldest16( HGLOBAL16 handle )
 657 {
 658     TRACE("%04x\n", handle );
 659     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 660     return handle;
 661 }
 662
 663
 664 /***********************************************************************
 665  *           GlobalLRUNewest   (KERNEL.164)
 666  */
 667 HGLOBAL16 WINAPI GlobalLRUNewest16( HGLOBAL16 handle )
 668 {
 669     TRACE("%04x\n", handle );
 670     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 671     return handle;
 672 }
 673
 674
 675 /***********************************************************************
 676  *           GetFreeSpace16   (KERNEL.169)
 677  */
 678 DWORD WINAPI GetFreeSpace16( UINT16 wFlags )
 679 {
 680     MEMORYSTATUS ms;
 681     GlobalMemoryStatus( &ms );
 682     return ms.dwAvailVirtual;
 683 }
 684
 685 /***********************************************************************
 686  *           GlobalDOSAlloc   (KERNEL.184)
 687  * RETURNS
 688  *      Address (HW=Paragraph segment; LW=Selector)
 689  */
 690 DWORD WINAPI GlobalDOSAlloc16(
 691              DWORD size /* [in] Number of bytes to be allocated */
 692 ) {
 693    UINT16    uParagraph;
 694    LPVOID    lpBlock = DOSMEM_GetBlock( size, &uParagraph );
 695
 696    if( lpBlock )
 697    {
 698        HMODULE16 hModule = GetModuleHandle16("KERNEL");
 699        WORD      wSelector;
 700        GLOBALARENA *pArena;
 701
 702        wSelector = GLOBAL_CreateBlock(GMEM_FIXED, lpBlock, size, hModule, WINE_LDT_FLAGS_DATA );
 703        pArena = GET_ARENA_PTR(wSelector);
 704        pArena->flags |= GA_DOSMEM;
 705        return MAKELONG(wSelector,uParagraph);
 706    }
 707    return 0;
 708 }
 709
 710
 711 /***********************************************************************
 712  *           GlobalDOSFree      (KERNEL.185)
 713  * RETURNS
 714  *      NULL: Success
 715  *      sel: Failure
 716  */
 717 WORD WINAPI GlobalDOSFree16(
 718             WORD sel /* [in] Selector */
 719 ) {
 720    DWORD   block = GetSelectorBase(sel);
 721
 722    if( block && block < 0x100000 )
 723    {
 724        LPVOID lpBlock = DOSMEM_MapDosToLinear( block );
 725        if( DOSMEM_FreeBlock( lpBlock ) )
 726            GLOBAL_FreeBlock( sel );
 727        sel = 0;
 728    }
 729    return sel;
 730 }
 731
 732
 733 /***********************************************************************
 734  *           GlobalPageLock   (KERNEL.191)
 735  */
 736 WORD WINAPI GlobalPageLock16( HGLOBAL16 handle )
 737 {
 738     TRACE("%04x\n", handle );
 739     if (!VALID_HANDLE(handle)) {
 740         WARN("Invalid handle 0x%04x passed to GlobalPageLock!\n",handle);
 741         return 0;
 742     }
 743     return ++(GET_ARENA_PTR(handle)->pageLockCount);
 744 }
 745
 746
 747 /***********************************************************************
 748  *           GlobalPageUnlock   (KERNEL.192)
 749  */
 750 WORD WINAPI GlobalPageUnlock16( HGLOBAL16 handle )
 751 {
 752     TRACE("%04x\n", handle );
 753     if (!VALID_HANDLE(handle)) {
 754         WARN("Invalid handle 0x%04x passed to GlobalPageUnlock!\n",handle);
 755         return 0;
 756     }
 757     return --(GET_ARENA_PTR(handle)->pageLockCount);
 758 }
 759
 760
 761 /***********************************************************************
 762  *           GlobalFix16   (KERNEL.197)
 763  */
 764 WORD WINAPI GlobalFix16( HGLOBAL16 handle )
 765 {
 766     TRACE("%04x\n", handle );
 767     if (!VALID_HANDLE(handle)) {
 768         WARN("Invalid handle 0x%04x passed to GlobalFix16!\n",handle);
 769         return 0;
 770     }
 771     GET_ARENA_PTR(handle)->lockCount++;
 772
 773     return GlobalHandleToSel16(handle);
 774 }
 775
 776
 777 /***********************************************************************
 778  *           GlobalUnfix16   (KERNEL.198)
 779  */
 780 void WINAPI GlobalUnfix16( HGLOBAL16 handle )
 781 {
 782     TRACE("%04x\n", handle );
 783     if (!VALID_HANDLE(handle)) {
 784         WARN("Invalid handle 0x%04x passed to GlobalUnfix16!\n",handle);
 785         return;
 786     }
 787     GET_ARENA_PTR(handle)->lockCount--;
 788 }
 789
 790
 791 /***********************************************************************
 792  *           FarSetOwner   (KERNEL.403)
 793  */
 794 void WINAPI FarSetOwner16( HGLOBAL16 handle, HANDLE16 hOwner )
 795 {
 796     if (!VALID_HANDLE(handle)) {
 797         WARN("Invalid handle 0x%04x passed to FarSetOwner!\n",handle);
 798         return;
 799     }
 800     GET_ARENA_PTR(handle)->hOwner = hOwner;
 801 }
 802
 803
 804 /***********************************************************************
 805  *           FarGetOwner   (KERNEL.404)
 806  */
 807 HANDLE16 WINAPI FarGetOwner16( HGLOBAL16 handle )
 808 {
 809     if (!VALID_HANDLE(handle)) {
 810         WARN("Invalid handle 0x%04x passed to FarGetOwner!\n",handle);
 811         return 0;
 812     }
 813     return GET_ARENA_PTR(handle)->hOwner;
 814 }
 815
 816
 817 /***********************************************************************
 818  *           GlobalHandleToSel   (TOOLHELP.50)
 819  */
 820 WORD WINAPI GlobalHandleToSel16( HGLOBAL16 handle )
 821 {
 822     if (!handle) return 0;
 823     if (!VALID_HANDLE(handle)) {
 824         WARN("Invalid handle 0x%04x passed to GlobalHandleToSel!\n",handle);
 825         return 0;
 826     }
 827     if (!(handle & 7))
 828     {
 829         WARN("Program attempted invalid selector conversion\n" );
 830         return handle - 1;
 831     }
 832     return handle | 7;
 833 }
 834
 835
 836 /***********************************************************************
 837  *           GlobalFirst   (TOOLHELP.51)
 838  */
 839 BOOL16 WINAPI GlobalFirst16( GLOBALENTRY *pGlobal, WORD wFlags )
 840 {
 841     if (wFlags == GLOBAL_LRU) return FALSE;
 842     pGlobal->dwNext = 0;
 843     return GlobalNext16( pGlobal, wFlags );
 844 }
 845
 846
 847 /***********************************************************************
 848  *           GlobalNext   (TOOLHELP.52)
 849  */
 850 BOOL16 WINAPI GlobalNext16( GLOBALENTRY *pGlobal, WORD wFlags)
 851 {
 852     GLOBALARENA *pArena;
 853
 854     if (pGlobal->dwNext >= globalArenaSize) return FALSE;
 855     pArena = pGlobalArena + pGlobal->dwNext;
 856     if (wFlags == GLOBAL_FREE)  /* only free blocks */
 857     {
 858         int i;
 859         for (i = pGlobal->dwNext; i < globalArenaSize; i++, pArena++)
 860             if (pArena->size == 0) break;  /* block is free */
 861         if (i >= globalArenaSize) return FALSE;
 862         pGlobal->dwNext = i;
 863     }
 864
 865     pGlobal->dwAddress    = pArena->base;
 866     pGlobal->dwBlockSize  = pArena->size;
 867     pGlobal->hBlock       = pArena->handle;
 868     pGlobal->wcLock       = pArena->lockCount;
 869     pGlobal->wcPageLock   = pArena->pageLockCount;
 870     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
 871     pGlobal->wHeapPresent = FALSE;
 872     pGlobal->hOwner       = pArena->hOwner;
 873     pGlobal->wType        = GT_UNKNOWN;
 874     pGlobal->wData        = 0;
 875     pGlobal->dwNext++;
 876     return TRUE;
 877 }
 878
 879
 880 /***********************************************************************
 881  *           GlobalInfo   (TOOLHELP.53)
 882  */
 883 BOOL16 WINAPI GlobalInfo16( GLOBALINFO *pInfo )
 884 {
 885     int i;
 886     GLOBALARENA *pArena;
 887
 888     pInfo->wcItems = globalArenaSize;
 889     pInfo->wcItemsFree = 0;
 890     pInfo->wcItemsLRU = 0;
 891     for (i = 0, pArena = pGlobalArena; i < globalArenaSize; i++, pArena++)
 892         if (pArena->size == 0) pInfo->wcItemsFree++;
 893     return TRUE;
 894 }
 895
 896
 897 /***********************************************************************
 898  *           GlobalEntryHandle   (TOOLHELP.54)
 899  */
 900 BOOL16 WINAPI GlobalEntryHandle16( GLOBALENTRY *pGlobal, HGLOBAL16 hItem )
 901 {
 902     GLOBALARENA *pArena = GET_ARENA_PTR(hItem);
 903
 904     pGlobal->dwAddress    = pArena->base;
 905     pGlobal->dwBlockSize  = pArena->size;
 906     pGlobal->hBlock       = pArena->handle;
 907     pGlobal->wcLock       = pArena->lockCount;
 908     pGlobal->wcPageLock   = pArena->pageLockCount;
 909     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
 910     pGlobal->wHeapPresent = FALSE;
 911     pGlobal->hOwner       = pArena->hOwner;
 912     pGlobal->wType        = GT_UNKNOWN;
 913     pGlobal->wData        = 0;
 914     pGlobal->dwNext++;
 915     return TRUE;
 916 }
 917
 918
 919 /***********************************************************************
 920  *           GlobalEntryModule   (TOOLHELP.55)
 921  */
 922 BOOL16 WINAPI GlobalEntryModule16( GLOBALENTRY *pGlobal, HMODULE16 hModule,
 923                                  WORD wSeg )
 924 {
 925     FIXME("(%p, 0x%04x, 0x%04x), stub.\n", pGlobal, hModule, wSeg);
 926     return FALSE;
 927 }
 928
 929
 930 /***********************************************************************
 931  *           MemManInfo   (TOOLHELP.72)
 932  */
 933 BOOL16 WINAPI MemManInfo16( MEMMANINFO *info )
 934 {
 935     MEMORYSTATUS status;
 936
 937     /*
 938      * Not unsurprisingly although the documention says you
 939      * _must_ provide the size in the dwSize field, this function
 940      * (under Windows) always fills the structure and returns true.
 941      */
 942     GlobalMemoryStatus( &status );
 943     info->wPageSize            = getpagesize();
 944     info->dwLargestFreeBlock   = status.dwAvailVirtual;
 945     info->dwMaxPagesAvailable  = info->dwLargestFreeBlock / info->wPageSize;
 946     info->dwMaxPagesLockable   = info->dwMaxPagesAvailable;
 947     info->dwTotalLinearSpace   = status.dwTotalVirtual / info->wPageSize;
 948     info->dwTotalUnlockedPages = info->dwTotalLinearSpace;
 949     info->dwFreePages          = info->dwMaxPagesAvailable;
 950     info->dwTotalPages         = info->dwTotalLinearSpace;
 951     info->dwFreeLinearSpace    = info->dwMaxPagesAvailable;
 952     info->dwSwapFilePages      = status.dwTotalPageFile / info->wPageSize;
 953     return TRUE;
 954 }
 955
 956 /***********************************************************************
 957  *           GetFreeMemInfo   (KERNEL.316)
 958  */
 959 DWORD WINAPI GetFreeMemInfo16(void)
 960 {
 961     MEMMANINFO info;
 962     MemManInfo16( &info );
 963     return MAKELONG( info.dwTotalLinearSpace, info.dwMaxPagesAvailable );
 964 }
 965
 966 /*
 967  * Win32 Global heap functions (GlobalXXX).
 968  * These functions included in Win32 for compatibility with 16 bit Windows
 969  * Especially the moveable blocks and handles are oldish.
 970  * But the ability to directly allocate memory with GPTR and LPTR is widely
 971  * used.
 972  *
 973  * The handle stuff looks horrible, but it's implemented almost like Win95
 974  * does it.
 975  *
 976  */
 977
 978 #define MAGIC_GLOBAL_USED 0x5342
 979 #define GLOBAL_LOCK_MAX   0xFF
 980 #define HANDLE_TO_INTERN(h)  ((PGLOBAL32_INTERN)(((char *)(h))-2))
 981 #define INTERN_TO_HANDLE(i)  ((HGLOBAL) &((i)->Pointer))
 982 #define POINTER_TO_HANDLE(p) (*(((HGLOBAL *)(p))-1))
 983 #define ISHANDLE(h)          (((DWORD)(h)&2)!=0)
 984 #define ISPOINTER(h)         (((DWORD)(h)&2)==0)
 985
 986 typedef struct __GLOBAL32_INTERN
 987 {
 988    WORD         Magic;
 989    LPVOID       Pointer WINE_PACKED;
 990    BYTE         Flags;
 991    BYTE         LockCount;
 992 } GLOBAL32_INTERN, *PGLOBAL32_INTERN;
 993
 994 /***********************************************************************
 995  *           GLOBAL_GetHeap
 996  *
 997  * Returns the appropriate heap to be used. If the object was created
 998  * With GMEM_DDESHARE we allocated it on the system heap.
 999  */
1000 static HANDLE GLOBAL_GetHeap( HGLOBAL hmem )
1001 {
1002    HANDLE heap;
1003
1004    TRACE("() hmem=%x\n", hmem);
1005
1006    /* Get the appropriate heap to be used for this object */
1007    if (ISPOINTER(hmem))
1008       heap = GetProcessHeap();
1009    else
1010    {
1011       PGLOBAL32_INTERN pintern;
1012       pintern=HANDLE_TO_INTERN(hmem);
1013
1014       /* If it was DDESHARE it was created on the shared system heap */
1015       pintern=HANDLE_TO_INTERN(hmem);
1016       heap = ( pintern->Flags & (GMEM_DDESHARE >> 8) )
1017            ? SystemHeap : GetProcessHeap();
1018    }
1019
1020    return heap;
1021 }
1022
1023 /***********************************************************************
1024  *           GlobalAlloc   (KERNEL32.315)
1025  * RETURNS
1026  *      Handle: Success
1027  *      NULL: Failure
1028  */
1029 HGLOBAL WINAPI GlobalAlloc(
1030                  UINT flags, /* [in] Object allocation attributes */
1031                  DWORD size    /* [in] Number of bytes to allocate */
1032 ) {
1033    PGLOBAL32_INTERN     pintern;
1034    DWORD                hpflags;
1035    LPVOID               palloc;
1036
1037    if(flags&GMEM_ZEROINIT)
1038       hpflags=HEAP_ZERO_MEMORY;
1039    else
1040       hpflags=0;
1041
1042    TRACE("() flags=%04x\n",  flags );
1043
1044    if((flags & GMEM_MOVEABLE)==0) /* POINTER */
1045    {
1046       palloc=HeapAlloc(GetProcessHeap(), hpflags, size);
1047       return (HGLOBAL) palloc;
1048    }
1049    else  /* HANDLE */
1050    {
1051       HANDLE heap;
1052
1053       /* If DDESHARE is set, create on the shared system heap */
1054       heap = (flags & GMEM_DDESHARE) ? SystemHeap : GetProcessHeap();
1055
1056       /* HeapLock(heap); */
1057
1058       pintern=HeapAlloc(heap, 0,  sizeof(GLOBAL32_INTERN));
1059       if (!pintern) return 0;
1060       if(size)
1061       {
1062          if (!(palloc=HeapAlloc(heap, hpflags, size+sizeof(HGLOBAL)))) {
1063             HeapFree(heap, 0, pintern);
1064             return 0;
1065          }
1066          *(HGLOBAL *)palloc=INTERN_TO_HANDLE(pintern);
1067          pintern->Pointer=(char *) palloc+sizeof(HGLOBAL);
1068       }
1069       else
1070          pintern->Pointer=NULL;
1071       pintern->Magic=MAGIC_GLOBAL_USED;
1072       pintern->Flags=flags>>8;
1073       pintern->LockCount=0;
1074
1075       /* HeapUnlock(heap); */
1076
1077       return INTERN_TO_HANDLE(pintern);
1078    }
1079 }
1080
1081
1082 /***********************************************************************
1083  *           GlobalLock   (KERNEL32.326)
1084  * RETURNS
1085  *      Pointer to first byte of block
1086  *      NULL: Failure
1087  */
1088 LPVOID WINAPI GlobalLock(
1089               HGLOBAL hmem /* [in] Handle of global memory object */
1090 ) {
1091    PGLOBAL32_INTERN pintern;
1092    LPVOID           palloc;
1093
1094    if(ISPOINTER(hmem))
1095       return (LPVOID) hmem;
1096
1097    /* HeapLock(GetProcessHeap()); */
1098
1099    pintern=HANDLE_TO_INTERN(hmem);
1100    if(pintern->Magic==MAGIC_GLOBAL_USED)
1101    {
1102       if(pintern->LockCount<GLOBAL_LOCK_MAX)
1103          pintern->LockCount++;
1104       palloc=pintern->Pointer;
1105    }
1106    else
1107    {
1108       WARN("invalid handle\n");
1109       palloc=(LPVOID) NULL;
1110       SetLastError(ERROR_INVALID_HANDLE);
1111    }
1112    /* HeapUnlock(GetProcessHeap()); */;
1113    return palloc;
1114 }
1115
1116
1117 /***********************************************************************
1118  *           GlobalUnlock   (KERNEL32.332)
1119  * RETURNS
1120  *      TRUE: Object is still locked
1121  *      FALSE: Object is unlocked
1122  */
1123 BOOL WINAPI GlobalUnlock(
1124               HGLOBAL hmem /* [in] Handle of global memory object */
1125 ) {
1126    PGLOBAL32_INTERN       pintern;
1127    BOOL                 locked;
1128
1129    if(ISPOINTER(hmem))
1130       return FALSE;
1131
1132    /* HeapLock(GetProcessHeap()); */
1133    pintern=HANDLE_TO_INTERN(hmem);
1134
1135    if(pintern->Magic==MAGIC_GLOBAL_USED)
1136    {
1137       if((pintern->LockCount<GLOBAL_LOCK_MAX)&&(pintern->LockCount>0))
1138          pintern->LockCount--;
1139
1140       locked = (pintern->LockCount != 0);
1141       if (!locked) SetLastError(NO_ERROR);
1142    }
1143    else
1144    {
1145       WARN("invalid handle\n");
1146       SetLastError(ERROR_INVALID_HANDLE);
1147       locked=FALSE;
1148    }
1149    /* HeapUnlock(GetProcessHeap()); */
1150    return locked;
1151 }
1152
1153
1154 /***********************************************************************
1155  *           GlobalHandle   (KERNEL32.325)
1156  * Returns the handle associated with the specified pointer.
1157  *
1158  * RETURNS
1159  *      Handle: Success
1160  *      NULL: Failure
1161  */
1162 HGLOBAL WINAPI GlobalHandle(
1163                  LPCVOID pmem /* [in] Pointer to global memory block */
1164 ) {
1165     HGLOBAL handle;
1166     HANDLE heap;
1167     PGLOBAL32_INTERN  maybe_intern;
1168     LPCVOID test;
1169
1170     if (!pmem)
1171     {
1172         SetLastError( ERROR_INVALID_PARAMETER );
1173         return 0;
1174     }
1175
1176     __TRY
1177     {
1178         handle = 0;
1179
1180         /* note that if pmem is a pointer to a a block allocated by        */
1181         /* GlobalAlloc with GMEM_MOVEABLE then magic test in HeapValidate  */
1182         /* will fail.                                                      */
1183         if (ISPOINTER(pmem)) {
1184             heap = GLOBAL_GetHeap( (HGLOBAL)pmem );
1185             if (HeapValidate( heap, 0, pmem )) {
1186                 handle = (HGLOBAL)pmem;  /* valid fixed block */
1187                 break;
1188             }
1189             handle = POINTER_TO_HANDLE(pmem);
1190         } else
1191             handle = (HGLOBAL)pmem;
1192
1193         /* Now test handle either passed in or retrieved from pointer */
1194         heap = GLOBAL_GetHeap( handle );
1195         maybe_intern = HANDLE_TO_INTERN( handle );
1196         if (maybe_intern->Magic == MAGIC_GLOBAL_USED) {
1197             test = maybe_intern->Pointer;
1198             if (HeapValidate( heap, 0, ((HGLOBAL *)test)-1 ) && /* obj(-handle) valid arena? */
1199                 HeapValidate( heap, 0, maybe_intern ))  /* intern valid arena? */
1200                 break;  /* valid moveable block */
1201         }
1202         handle = 0;
1203         SetLastError( ERROR_INVALID_HANDLE );
1204     }
1205     __EXCEPT(page_fault)
1206     {
1207         SetLastError( ERROR_INVALID_HANDLE );
1208         return 0;
1209     }
1210     __ENDTRY
1211
1212     return handle;
1213 }
1214
1215
1216 /***********************************************************************
1217  *           GlobalReAlloc   (KERNEL32.328)
1218  * RETURNS
1219  *      Handle: Success
1220  *      NULL: Failure
1221  */
1222 HGLOBAL WINAPI GlobalReAlloc(
1223                  HGLOBAL hmem, /* [in] Handle of global memory object */
1224                  DWORD size,     /* [in] New size of block */
1225                  UINT flags    /* [in] How to reallocate object */
1226 ) {
1227    LPVOID               palloc;
1228    HGLOBAL            hnew;
1229    PGLOBAL32_INTERN     pintern;
1230    HANDLE heap = GLOBAL_GetHeap( hmem );
1231    DWORD heap_flags = (flags & GMEM_ZEROINIT) ? HEAP_ZERO_MEMORY : 0;
1232
1233    hnew = 0;
1234    /* HeapLock(heap); */
1235    if(flags & GMEM_MODIFY) /* modify flags */
1236    {
1237       if( ISPOINTER(hmem) && (flags & GMEM_MOVEABLE))
1238       {
1239          /* make a fixed block moveable
1240           * actually only NT is able to do this. But it's soo simple
1241           */
1242          if (hmem == 0)
1243          {
1244              ERR("GlobalReAlloc32 with null handle!\n");
1245              SetLastError( ERROR_NOACCESS );
1246              return 0;
1247          }
1248          size=HeapSize(heap, 0, (LPVOID) hmem);
1249          hnew=GlobalAlloc( flags, size);
1250          palloc=GlobalLock(hnew);
1251          memcpy(palloc, (LPVOID) hmem, size);
1252          GlobalUnlock(hnew);
1253          GlobalFree(hmem);
1254       }
1255       else if( ISPOINTER(hmem) &&(flags & GMEM_DISCARDABLE))
1256       {
1257          /* change the flags to make our block "discardable" */
1258          pintern=HANDLE_TO_INTERN(hmem);
1259          pintern->Flags = pintern->Flags | (GMEM_DISCARDABLE >> 8);
1260          hnew=hmem;
1261       }
1262       else
1263       {
1264          SetLastError(ERROR_INVALID_PARAMETER);
1265          hnew = 0;
1266       }
1267    }
1268    else
1269    {
1270       if(ISPOINTER(hmem))
1271       {
1272          /* reallocate fixed memory */
1273          hnew=(HGLOBAL)HeapReAlloc(heap, heap_flags, (LPVOID) hmem, size);
1274       }
1275       else
1276       {
1277          /* reallocate a moveable block */
1278          pintern=HANDLE_TO_INTERN(hmem);
1279
1280 #if 0
1281 /* Apparently Windows doesn't care whether the handle is locked at this point */
1282 /* See also the same comment in GlobalFree() */
1283          if(pintern->LockCount>1) {
1284             ERR("handle 0x%08lx is still locked, cannot realloc!\n",(DWORD)hmem);
1285             SetLastError(ERROR_INVALID_HANDLE);
1286          } else
1287 #endif
1288          if(size!=0)
1289          {
1290             hnew=hmem;
1291             if(pintern->Pointer)
1292             {
1293                if((palloc = HeapReAlloc(heap, heap_flags,
1294                                    (char *) pintern->Pointer-sizeof(HGLOBAL),
1295                                    size+sizeof(HGLOBAL))) == NULL)
1296                    return 0; /* Block still valid */
1297                pintern->Pointer=(char *) palloc+sizeof(HGLOBAL);
1298             }
1299             else
1300             {
1301                 if((palloc=HeapAlloc(heap, heap_flags, size+sizeof(HGLOBAL)))
1302                    == NULL)
1303                     return 0;
1304                *(HGLOBAL *)palloc=hmem;
1305                pintern->Pointer=(char *) palloc+sizeof(HGLOBAL);
1306             }
1307          }
1308          else
1309          {
1310             if(pintern->Pointer)
1311             {
1312                HeapFree(heap, 0, (char *) pintern->Pointer-sizeof(HGLOBAL));
1313                pintern->Pointer=NULL;
1314             }
1315          }
1316       }
1317    }
1318    /* HeapUnlock(heap); */
1319    return hnew;
1320 }
1321
1322
1323 /***********************************************************************
1324  *           GlobalFree   (KERNEL32.322)
1325  * RETURNS
1326  *      NULL: Success
1327  *      Handle: Failure
1328  */
1329 HGLOBAL WINAPI GlobalFree(
1330                  HGLOBAL hmem /* [in] Handle of global memory object */
1331 ) {
1332    PGLOBAL32_INTERN pintern;
1333    HGLOBAL        hreturned = 0;
1334    HANDLE heap = GLOBAL_GetHeap( hmem );
1335
1336    if(ISPOINTER(hmem)) /* POINTER */
1337    {
1338       if(!HeapFree(heap, 0, (LPVOID) hmem)) hmem = 0;
1339    }
1340    else  /* HANDLE */
1341    {
1342       /* HeapLock(heap); */
1343       pintern=HANDLE_TO_INTERN(hmem);
1344
1345       if(pintern->Magic==MAGIC_GLOBAL_USED)
1346       {
1347
1348 /* WIN98 does not make this test. That is you can free a */
1349 /* block you have not unlocked. Go figure!!              */
1350       /* if(pintern->LockCount!=0)  */
1351       /*    SetLastError(ERROR_INVALID_HANDLE);  */
1352
1353          if(pintern->Pointer)
1354             if(!HeapFree(heap, 0,
1355                          (char *)(pintern->Pointer)-sizeof(HGLOBAL)))
1356                hreturned=hmem;
1357          if(!HeapFree(heap, 0, pintern))
1358             hreturned=hmem;
1359       }
1360       /* HeapUnlock(heap); */
1361    }
1362    return hreturned;
1363 }
1364
1365
1366 /***********************************************************************
1367  *           GlobalSize   (KERNEL32.329)
1368  * RETURNS
1369  *      Size in bytes of the global memory object
1370  *      0: Failure
1371  */
1372 DWORD WINAPI GlobalSize(
1373              HGLOBAL hmem /* [in] Handle of global memory object */
1374 ) {
1375    DWORD                retval;
1376    PGLOBAL32_INTERN     pintern;
1377    HANDLE heap          = GLOBAL_GetHeap( hmem );
1378
1379    if(ISPOINTER(hmem))
1380    {
1381       retval=HeapSize(heap, 0,  (LPVOID) hmem);
1382    }
1383    else
1384    {
1385       /* HeapLock(heap); */
1386       pintern=HANDLE_TO_INTERN(hmem);
1387
1388       if(pintern->Magic==MAGIC_GLOBAL_USED)
1389       {
1390         if (!pintern->Pointer) /* handle case of GlobalAlloc( ??,0) */
1391             return 0;
1392          retval=HeapSize(heap, 0,
1393                          (char *)(pintern->Pointer)-sizeof(HGLOBAL))-4;
1394          if (retval == 0xffffffff-4) retval = 0;
1395       }
1396       else
1397       {
1398          WARN("invalid handle\n");
1399          retval=0;
1400       }
1401       /* HeapUnlock(heap); */
1402    }
1403    /* HeapSize returns 0xffffffff on failure */
1404    if (retval == 0xffffffff) retval = 0;
1405    return retval;
1406 }
1407
1408
1409 /***********************************************************************
1410  *           GlobalWire   (KERNEL32.333)
1411  */
1412 LPVOID WINAPI GlobalWire(HGLOBAL hmem)
1413 {
1414    return GlobalLock( hmem );
1415 }
1416
1417
1418 /***********************************************************************
1419  *           GlobalUnWire   (KERNEL32.330)
1420  */
1421 BOOL WINAPI GlobalUnWire(HGLOBAL hmem)
1422 {
1423    return GlobalUnlock( hmem);
1424 }
1425
1426
1427 /***********************************************************************
1428  *           GlobalFix   (KERNEL32.320)
1429  */
1430 VOID WINAPI GlobalFix(HGLOBAL hmem)
1431 {
1432     GlobalLock( hmem );
1433 }
1434
1435
1436 /***********************************************************************
1437  *           GlobalUnfix   (KERNEL32.331)
1438  */
1439 VOID WINAPI GlobalUnfix(HGLOBAL hmem)
1440 {
1441    GlobalUnlock( hmem);
1442 }
1443
1444
1445 /***********************************************************************
1446  *           GlobalFlags   (KERNEL32.321)
1447  * Returns information about the specified global memory object
1448  *
1449  * NOTES
1450  *      Should this return GMEM_INVALID_HANDLE on invalid handle?
1451  *
1452  * RETURNS
1453  *      Value specifying allocation flags and lock count
1454  *      GMEM_INVALID_HANDLE: Failure
1455  */
1456 UINT WINAPI GlobalFlags(
1457               HGLOBAL hmem /* [in] Handle to global memory object */
1458 ) {
1459    DWORD                retval;
1460    PGLOBAL32_INTERN     pintern;
1461
1462    if(ISPOINTER(hmem))
1463    {
1464       retval=0;
1465    }
1466    else
1467    {
1468       /* HeapLock(GetProcessHeap()); */
1469       pintern=HANDLE_TO_INTERN(hmem);
1470       if(pintern->Magic==MAGIC_GLOBAL_USED)
1471       {
1472          retval=pintern->LockCount + (pintern->Flags<<8);
1473          if(pintern->Pointer==0)
1474             retval|= GMEM_DISCARDED;
1475       }
1476       else
1477       {
1478          WARN("Invalid handle: %04x", hmem);
1479          retval=0;
1480       }
1481       /* HeapUnlock(GetProcessHeap()); */
1482    }
1483    return retval;
1484 }
1485
1486
1487 /***********************************************************************
1488  *           GlobalCompact   (KERNEL32.316)
1489  */
1490 DWORD WINAPI GlobalCompact( DWORD minfree )
1491 {
1492     return 0;  /* GlobalCompact does nothing in Win32 */
1493 }
1494
1495
1496 /***********************************************************************
1497  *           GlobalMemoryStatus   (KERNEL32.327)
1498  * RETURNS
1499  *      None
1500  */
1501 VOID WINAPI GlobalMemoryStatus(
1502             LPMEMORYSTATUS lpmem
1503 ) {
1504     static MEMORYSTATUS cached_memstatus;
1505     static int cache_lastchecked = 0;
1506     SYSTEM_INFO si;
1507 #ifdef linux
1508     FILE *f;
1509 #endif
1510
1511     if (time(NULL)==cache_lastchecked) {
1512         memcpy(lpmem,&cached_memstatus,sizeof(MEMORYSTATUS));
1513         return;
1514     }
1515     cache_lastchecked = time(NULL);
1516
1517 #ifdef linux
1518     f = fopen( "/proc/meminfo", "r" );
1519     if (f)
1520     {
1521         char buffer[256];
1522         int total, used, free, shared, buffers, cached;
1523
1524         lpmem->dwLength = sizeof(MEMORYSTATUS);
1525         lpmem->dwTotalPhys = lpmem->dwAvailPhys = 0;
1526         lpmem->dwTotalPageFile = lpmem->dwAvailPageFile = 0;
1527         while (fgets( buffer, sizeof(buffer), f ))
1528         {
1529             /* old style /proc/meminfo ... */
1530             if (sscanf( buffer, "Mem: %d %d %d %d %d %d", &total, &used, &free, &shared, &buffers, &cached ))
1531             {
1532                 lpmem->dwTotalPhys += total;
1533                 lpmem->dwAvailPhys += free + buffers + cached;
1534             }
1535             if (sscanf( buffer, "Swap: %d %d %d", &total, &used, &free ))
1536             {
1537                 lpmem->dwTotalPageFile += total;
1538                 lpmem->dwAvailPageFile += free;
1539             }
1540
1541             /* new style /proc/meminfo ... */
1542             if (sscanf(buffer, "MemTotal: %d", &total))
1543                 lpmem->dwTotalPhys = total*1024;
1544             if (sscanf(buffer, "MemFree: %d", &free))
1545                 lpmem->dwAvailPhys = free*1024;
1546             if (sscanf(buffer, "SwapTotal: %d", &total))
1547                 lpmem->dwTotalPageFile = total*1024;
1548             if (sscanf(buffer, "SwapFree: %d", &free))
1549                 lpmem->dwAvailPageFile = free*1024;
1550             if (sscanf(buffer, "Buffers: %d", &buffers))
1551                 lpmem->dwAvailPhys += buffers*1024;
1552             if (sscanf(buffer, "Cached: %d", &cached))
1553                 lpmem->dwAvailPhys += cached*1024;
1554         }
1555         fclose( f );
1556
1557         if (lpmem->dwTotalPhys)
1558         {
1559             DWORD TotalPhysical = lpmem->dwTotalPhys+lpmem->dwTotalPageFile;
1560             DWORD AvailPhysical = lpmem->dwAvailPhys+lpmem->dwAvailPageFile;
1561             lpmem->dwMemoryLoad = (TotalPhysical-AvailPhysical)
1562                                       / (TotalPhysical / 100);
1563         }
1564     } else
1565 #endif
1566     {
1567         /* FIXME: should do something for other systems */
1568         lpmem->dwMemoryLoad    = 0;
1569         lpmem->dwTotalPhys     = 16*1024*1024;
1570         lpmem->dwAvailPhys     = 16*1024*1024;
1571         lpmem->dwTotalPageFile = 16*1024*1024;
1572         lpmem->dwAvailPageFile = 16*1024*1024;
1573     }
1574     GetSystemInfo(&si);
1575     lpmem->dwTotalVirtual  = si.lpMaximumApplicationAddress-si.lpMinimumApplicationAddress;
1576     /* FIXME: we should track down all the already allocated VM pages and substract them, for now arbitrarily remove 64KB so that it matches NT */
1577     lpmem->dwAvailVirtual  = lpmem->dwTotalVirtual-64*1024;
1578     memcpy(&cached_memstatus,lpmem,sizeof(MEMORYSTATUS));
1579
1580     /* it appears some memory display programs want to divide by these values */
1581     if(lpmem->dwTotalPageFile==0)
1582         lpmem->dwTotalPageFile++;
1583
1584     if(lpmem->dwAvailPageFile==0)
1585         lpmem->dwAvailPageFile++;
1586 }
1587
1588 /***********************************************************************
1589  *           A20Proc16   (KERNEL.165)
1590  */
1591 void WINAPI A20Proc16( WORD unused )
1592 {
1593     /* this is also a NOP in Windows */
1594 }
1595
1596 /***********************************************************************
1597  *           LimitEMSPages16   (KERNEL.156)
1598  */
1599 DWORD WINAPI LimitEMSPages16( DWORD unused )
1600 {
1601     return 0;
1602 }