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         HeapFree( GetProcessHeap(), 0, (void *)pArena->base );
 312         pArena->base = 0;
 313
 314         /* Note: we rely on the fact that SELECTOR_ReallocBlock won't
 315          * change the selector if we are shrinking the block.
 316          * FIXME: shouldn't we keep selectors until the block is deleted?
 317          */
 318         SELECTOR_ReallocBlock( sel, 0, 1 );
 319         return handle;
 320     }
 321
 322       /* Fixup the size */
 323
 324     if (size > GLOBAL_MAX_ALLOC_SIZE - 0x20) return 0;
 325     if (size == 0) size = 0x20;
 326     else size = (size + 0x1f) & ~0x1f;
 327
 328       /* Change the flags */
 329
 330     if (flags & GMEM_MODIFY)
 331     {
 332           /* Change the flags, leaving GA_DGROUP alone */
 333         pArena->flags = (pArena->flags & GA_DGROUP) | (flags & GA_MOVEABLE);
 334         if (flags & GMEM_DISCARDABLE) pArena->flags |= GA_DISCARDABLE;
 335         return handle;
 336     }
 337
 338       /* Reallocate the linear memory */
 339
 340     ptr = (void *)pArena->base;
 341     oldsize = pArena->size;
 342     TRACE("oldbase %p oldsize %08lx newsize %08lx\n", ptr,oldsize,size);
 343     if (ptr && (size == oldsize)) return handle;  /* Nothing to do */
 344
 345     if (pArena->flags & GA_DOSMEM)
 346         newptr = DOSMEM_ResizeBlock(ptr, size, NULL);
 347     else
 348         /* if more then one reader (e.g. some pointer has been given out by GetVDMPointer32W16),
 349            only try to realloc in place */
 350         newptr = HeapReAlloc( GetProcessHeap(),
 351                               (pArena->pageLockCount > 0)?HEAP_REALLOC_IN_PLACE_ONLY:0, ptr, size );
 352     if (!newptr)
 353     {
 354         FIXME("Realloc failed lock %d\n",pArena->pageLockCount);
 355         if (pArena->pageLockCount <1)
 356         {
 357             HeapFree( GetProcessHeap(), 0, ptr );
 358             SELECTOR_FreeBlock( sel );
 359             memset( pArena, 0, sizeof(GLOBALARENA) );
 360         }
 361         return 0;
 362     }
 363     ptr = newptr;
 364
 365       /* Reallocate the selector(s) */
 366
 367     sel = SELECTOR_ReallocBlock( sel, ptr, size );
 368     if (!sel)
 369     {
 370         HeapFree( GetProcessHeap(), 0, ptr );
 371         memset( pArena, 0, sizeof(GLOBALARENA) );
 372         return 0;
 373     }
 374     selcount = (size + 0xffff) / 0x10000;
 375
 376     if (!(pNewArena = GLOBAL_GetArena( sel, selcount )))
 377     {
 378         HeapFree( GetProcessHeap(), 0, ptr );
 379         SELECTOR_FreeBlock( sel );
 380         return 0;
 381     }
 382
 383       /* Fill the new arena block
 384          As we may have used HEAP_REALLOC_IN_PLACE_ONLY, areas may overlap*/
 385
 386     if (pNewArena != pArena) memmove( pNewArena, pArena, sizeof(GLOBALARENA) );
 387     pNewArena->base = (DWORD)ptr;
 388     pNewArena->size = GetSelectorLimit16(sel) + 1;
 389     pNewArena->selCount = selcount;
 390     pNewArena->handle = (pNewArena->flags & GA_MOVEABLE) ? sel - 1 : sel;
 391
 392     if (selcount > 1)  /* clear the next arena blocks */
 393         memset( pNewArena + 1, 0, (selcount - 1) * sizeof(GLOBALARENA) );
 394
 395     if ((oldsize < size) && (flags & GMEM_ZEROINIT))
 396         memset( (char *)ptr + oldsize, 0, size - oldsize );
 397     return pNewArena->handle;
 398 }
 399
 400
 401 /***********************************************************************
 402  *           GlobalFree     (KERNEL.17)
 403  *           GlobalFree16   (KERNEL32.31)
 404  * RETURNS
 405  *      NULL: Success
 406  *      Handle: Failure
 407  */
 408 HGLOBAL16 WINAPI GlobalFree16(
 409                  HGLOBAL16 handle /* [in] Handle of global memory object */
 410 ) {
 411     void *ptr;
 412
 413     if (!VALID_HANDLE(handle)) {
 414         WARN("Invalid handle 0x%04x passed to GlobalFree16!\n",handle);
 415         return 0;
 416     }
 417     ptr = (void *)GET_ARENA_PTR(handle)->base;
 418
 419     TRACE("%04x\n", handle );
 420     if (!GLOBAL_FreeBlock( handle )) return handle;  /* failed */
 421     if (ptr) HeapFree( GetProcessHeap(), 0, ptr );
 422     return 0;
 423 }
 424
 425
 426 /***********************************************************************
 427  *           GlobalLock   (KERNEL.18)
 428  *
 429  * This is the GlobalLock16() function used by 16-bit code.
 430  */
 431 SEGPTR WINAPI WIN16_GlobalLock16( HGLOBAL16 handle )
 432 {
 433     WORD sel = GlobalHandleToSel16( handle );
 434     TRACE("(%04x) -> %08lx\n", handle, MAKELONG( 0, sel ) );
 435
 436     if (handle)
 437     {
 438         if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 439
 440         if (!VALID_HANDLE(handle)) {
 441             WARN("Invalid handle 0x%04x passed to WIN16_GlobalLock16!\n",handle);
 442             sel = 0;
 443         }
 444         else if (!GET_ARENA_PTR(handle)->base)
 445             sel = 0;
 446         else
 447             GET_ARENA_PTR(handle)->lockCount++;
 448     }
 449
 450     CURRENT_STACK16->ecx = sel;  /* selector must be returned in CX as well */
 451     return MAKESEGPTR( sel, 0 );
 452 }
 453
 454
 455 /**********************************************************************
 456  *           K32WOWGlobalLock16         (KERNEL32.60)
 457  */
 458 SEGPTR WINAPI K32WOWGlobalLock16( HGLOBAL16 hMem )
 459 {
 460     return WIN16_GlobalLock16( hMem );
 461 }
 462
 463
 464 /***********************************************************************
 465  *           GlobalLock16   (KERNEL32.25)
 466  *
 467  * This is the GlobalLock16() function used by 32-bit code.
 468  *
 469  * RETURNS
 470  *      Pointer to first byte of memory block
 471  *      NULL: Failure
 472  */
 473 LPVOID WINAPI GlobalLock16(
 474               HGLOBAL16 handle /* [in] Handle of global memory object */
 475 ) {
 476     if (!handle) return 0;
 477     if (!VALID_HANDLE(handle))
 478         return (LPVOID)0;
 479     GET_ARENA_PTR(handle)->lockCount++;
 480     return (LPVOID)GET_ARENA_PTR(handle)->base;
 481 }
 482
 483
 484 /***********************************************************************
 485  *           GlobalUnlock     (KERNEL.19)
 486  *           GlobalUnlock16   (KERNEL32.26)
 487  * NOTES
 488  *      Should the return values be cast to booleans?
 489  *
 490  * RETURNS
 491  *      TRUE: Object is still locked
 492  *      FALSE: Object is unlocked
 493  */
 494 BOOL16 WINAPI GlobalUnlock16(
 495               HGLOBAL16 handle /* [in] Handle of global memory object */
 496 ) {
 497     GLOBALARENA *pArena = GET_ARENA_PTR(handle);
 498     if (!VALID_HANDLE(handle)) {
 499         WARN("Invalid handle 0x%04x passed to GlobalUnlock16!\n",handle);
 500         return 0;
 501     }
 502     TRACE("%04x\n", handle );
 503     if (pArena->lockCount) pArena->lockCount--;
 504     return pArena->lockCount;
 505 }
 506
 507 /***********************************************************************
 508  *     GlobalChangeLockCount               (KERNEL.365)
 509  *
 510  * This is declared as a register function as it has to preserve
 511  * *all* registers, even AX/DX !
 512  *
 513  */
 514 void WINAPI GlobalChangeLockCount16( HGLOBAL16 handle, INT16 delta,
 515                                      CONTEXT86 *context )
 516 {
 517     if ( delta == 1 )
 518         GlobalLock16( handle );
 519     else if ( delta == -1 )
 520         GlobalUnlock16( handle );
 521     else
 522         ERR("(%04X, %d): strange delta value\n", handle, delta );
 523 }
 524
 525 /***********************************************************************
 526  *           GlobalSize     (KERNEL.20)
 527  *           GlobalSize16   (KERNEL32.32)
 528  * RETURNS
 529  *      Size in bytes of object
 530  *      0: Failure
 531  */
 532 DWORD WINAPI GlobalSize16(
 533              HGLOBAL16 handle /* [in] Handle of global memory object */
 534 ) {
 535     TRACE("%04x\n", handle );
 536     if (!handle) return 0;
 537     if (!VALID_HANDLE(handle))
 538         return 0;
 539     return GET_ARENA_PTR(handle)->size;
 540 }
 541
 542
 543 /***********************************************************************
 544  *           GlobalHandle   (KERNEL.21)
 545  * NOTES
 546  *      Why is GlobalHandleToSel used here with the sel as input?
 547  *
 548  * RETURNS
 549  *      Handle: Success
 550  *      NULL: Failure
 551  */
 552 DWORD WINAPI GlobalHandle16(
 553              WORD sel /* [in] Address of global memory block */
 554 ) {
 555     TRACE("%04x\n", sel );
 556     if (!VALID_HANDLE(sel)) {
 557         WARN("Invalid handle 0x%04x passed to GlobalHandle16!\n",sel);
 558         return 0;
 559     }
 560     return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 561 }
 562
 563 /***********************************************************************
 564  *           GlobalHandleNoRIP   (KERNEL.159)
 565  */
 566 DWORD WINAPI GlobalHandleNoRIP16( WORD sel )
 567 {
 568     int i;
 569     for (i = globalArenaSize-1 ; i>=0 ; i--) {
 570         if (pGlobalArena[i].size!=0 && pGlobalArena[i].handle == sel)
 571                 return MAKELONG( GET_ARENA_PTR(sel)->handle, GlobalHandleToSel16(sel) );
 572     }
 573     return 0;
 574 }
 575
 576
 577 /***********************************************************************
 578  *           GlobalFlags     (KERNEL.22)
 579  *
 580  * NOTES
 581  *      Should this return GMEM_INVALID_HANDLE instead of 0 on invalid
 582  *      handle?
 583  *
 584  * RETURNS
 585  *      Value specifying flags and lock count
 586  *      GMEM_INVALID_HANDLE: Invalid handle
 587  */
 588 UINT16 WINAPI GlobalFlags16(
 589               HGLOBAL16 handle /* [in] Handle of global memory object */
 590 ) {
 591     GLOBALARENA *pArena;
 592
 593     TRACE("%04x\n", handle );
 594     if (!VALID_HANDLE(handle)) {
 595         WARN("Invalid handle 0x%04x passed to GlobalFlags16!\n",handle);
 596         return 0;
 597     }
 598     pArena = GET_ARENA_PTR(handle);
 599     return pArena->lockCount |
 600            ((pArena->flags & GA_DISCARDABLE) ? GMEM_DISCARDABLE : 0) |
 601            ((pArena->base == 0) ? GMEM_DISCARDED : 0);
 602 }
 603
 604
 605 /***********************************************************************
 606  *           LockSegment   (KERNEL.23)
 607  */
 608 HGLOBAL16 WINAPI LockSegment16( HGLOBAL16 handle )
 609 {
 610     TRACE("%04x\n", handle );
 611     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 612     if (!VALID_HANDLE(handle)) {
 613         WARN("Invalid handle 0x%04x passed to LockSegment16!\n",handle);
 614         return 0;
 615     }
 616     GET_ARENA_PTR(handle)->lockCount++;
 617     return handle;
 618 }
 619
 620
 621 /***********************************************************************
 622  *           UnlockSegment   (KERNEL.24)
 623  */
 624 void WINAPI UnlockSegment16( HGLOBAL16 handle )
 625 {
 626     TRACE("%04x\n", handle );
 627     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 628     if (!VALID_HANDLE(handle)) {
 629         WARN("Invalid handle 0x%04x passed to UnlockSegment16!\n",handle);
 630         return;
 631     }
 632     GET_ARENA_PTR(handle)->lockCount--;
 633     /* FIXME: this ought to return the lock count in CX (go figure...) */
 634 }
 635
 636
 637 /***********************************************************************
 638  *           GlobalCompact   (KERNEL.25)
 639  */
 640 DWORD WINAPI GlobalCompact16( DWORD desired )
 641 {
 642     return GLOBAL_MAX_ALLOC_SIZE;
 643 }
 644
 645
 646 /***********************************************************************
 647  *           GlobalFreeAll   (KERNEL.26)
 648  */
 649 void WINAPI GlobalFreeAll16( HGLOBAL16 owner )
 650 {
 651     DWORD i;
 652     GLOBALARENA *pArena;
 653
 654     pArena = pGlobalArena;
 655     for (i = 0; i < globalArenaSize; i++, pArena++)
 656     {
 657         if ((pArena->size != 0) && (pArena->hOwner == owner))
 658             GlobalFree16( pArena->handle );
 659     }
 660 }
 661
 662
 663 /***********************************************************************
 664  *           GlobalWire     (KERNEL.111)
 665  *           GlobalWire16   (KERNEL32.29)
 666  */
 667 SEGPTR WINAPI GlobalWire16( HGLOBAL16 handle )
 668 {
 669     return WIN16_GlobalLock16( handle );
 670 }
 671
 672
 673 /***********************************************************************
 674  *           GlobalUnWire     (KERNEL.112)
 675  *           GlobalUnWire16   (KERNEL32.30)
 676  */
 677 BOOL16 WINAPI GlobalUnWire16( HGLOBAL16 handle )
 678 {
 679     return !GlobalUnlock16( handle );
 680 }
 681
 682
 683 /***********************************************************************
 684  *           SetSwapAreaSize   (KERNEL.106)
 685  */
 686 LONG WINAPI SetSwapAreaSize16( WORD size )
 687 {
 688     FIXME("(%d) - stub!\n", size );
 689     return MAKELONG( size, 0xffff );
 690 }
 691
 692
 693 /***********************************************************************
 694  *           GlobalLRUOldest   (KERNEL.163)
 695  */
 696 HGLOBAL16 WINAPI GlobalLRUOldest16( HGLOBAL16 handle )
 697 {
 698     TRACE("%04x\n", handle );
 699     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 700     return handle;
 701 }
 702
 703
 704 /***********************************************************************
 705  *           GlobalLRUNewest   (KERNEL.164)
 706  */
 707 HGLOBAL16 WINAPI GlobalLRUNewest16( HGLOBAL16 handle )
 708 {
 709     TRACE("%04x\n", handle );
 710     if (handle == (HGLOBAL16)-1) handle = CURRENT_DS;
 711     return handle;
 712 }
 713
 714
 715 /***********************************************************************
 716  *           GetFreeSpace   (KERNEL.169)
 717  */
 718 DWORD WINAPI GetFreeSpace16( UINT16 wFlags )
 719 {
 720     MEMORYSTATUS ms;
 721     GlobalMemoryStatus( &ms );
 722     return ms.dwAvailVirtual;
 723 }
 724
 725 /***********************************************************************
 726  *           GlobalDOSAlloc   (KERNEL.184)
 727  * RETURNS
 728  *      Address (HW=Paragraph segment; LW=Selector)
 729  */
 730 DWORD WINAPI GlobalDOSAlloc16(
 731              DWORD size /* [in] Number of bytes to be allocated */
 732 ) {
 733    UINT16    uParagraph;
 734    LPVOID    lpBlock = DOSMEM_GetBlock( size, &uParagraph );
 735
 736    if( lpBlock )
 737    {
 738        HMODULE16 hModule = GetModuleHandle16("KERNEL");
 739        WORD      wSelector;
 740        GLOBALARENA *pArena;
 741
 742        wSelector = GLOBAL_CreateBlock(GMEM_FIXED, lpBlock, size, hModule, WINE_LDT_FLAGS_DATA );
 743        pArena = GET_ARENA_PTR(wSelector);
 744        pArena->flags |= GA_DOSMEM;
 745        return MAKELONG(wSelector,uParagraph);
 746    }
 747    return 0;
 748 }
 749
 750
 751 /***********************************************************************
 752  *           GlobalDOSFree      (KERNEL.185)
 753  * RETURNS
 754  *      NULL: Success
 755  *      sel: Failure
 756  */
 757 WORD WINAPI GlobalDOSFree16(
 758             WORD sel /* [in] Selector */
 759 ) {
 760    DWORD   block = GetSelectorBase(sel);
 761
 762    if( block && block < 0x100000 )
 763    {
 764        LPVOID lpBlock = DOSMEM_MapDosToLinear( block );
 765        if( DOSMEM_FreeBlock( lpBlock ) )
 766            GLOBAL_FreeBlock( sel );
 767        sel = 0;
 768    }
 769    return sel;
 770 }
 771
 772
 773 /***********************************************************************
 774  *           GlobalPageLock   (KERNEL.191)
 775  *           GlobalSmartPageLock(KERNEL.230)
 776  */
 777 WORD WINAPI GlobalPageLock16( HGLOBAL16 handle )
 778 {
 779     TRACE("%04x\n", handle );
 780     if (!VALID_HANDLE(handle)) {
 781         WARN("Invalid handle 0x%04x passed to GlobalPageLock!\n",handle);
 782         return 0;
 783     }
 784     return ++(GET_ARENA_PTR(handle)->pageLockCount);
 785 }
 786
 787
 788 /***********************************************************************
 789  *           GlobalPageUnlock   (KERNEL.192)
 790  *           GlobalSmartPageUnlock(KERNEL.231)
 791  */
 792 WORD WINAPI GlobalPageUnlock16( HGLOBAL16 handle )
 793 {
 794     TRACE("%04x\n", handle );
 795     if (!VALID_HANDLE(handle)) {
 796         WARN("Invalid handle 0x%04x passed to GlobalPageUnlock!\n",handle);
 797         return 0;
 798     }
 799     return --(GET_ARENA_PTR(handle)->pageLockCount);
 800 }
 801
 802
 803 /***********************************************************************
 804  *           GlobalFix     (KERNEL.197)
 805  *           GlobalFix16   (KERNEL32.27)
 806  */
 807 WORD WINAPI GlobalFix16( HGLOBAL16 handle )
 808 {
 809     TRACE("%04x\n", handle );
 810     if (!VALID_HANDLE(handle)) {
 811         WARN("Invalid handle 0x%04x passed to GlobalFix16!\n",handle);
 812         return 0;
 813     }
 814     GET_ARENA_PTR(handle)->lockCount++;
 815
 816     return GlobalHandleToSel16(handle);
 817 }
 818
 819
 820 /***********************************************************************
 821  *           GlobalUnfix     (KERNEL.198)
 822  *           GlobalUnfix16   (KERNEL32.28)
 823  */
 824 void WINAPI GlobalUnfix16( HGLOBAL16 handle )
 825 {
 826     TRACE("%04x\n", handle );
 827     if (!VALID_HANDLE(handle)) {
 828         WARN("Invalid handle 0x%04x passed to GlobalUnfix16!\n",handle);
 829         return;
 830     }
 831     GET_ARENA_PTR(handle)->lockCount--;
 832 }
 833
 834
 835 /***********************************************************************
 836  *           FarSetOwner   (KERNEL.403)
 837  */
 838 void WINAPI FarSetOwner16( HGLOBAL16 handle, HANDLE16 hOwner )
 839 {
 840     if (!VALID_HANDLE(handle)) {
 841         WARN("Invalid handle 0x%04x passed to FarSetOwner!\n",handle);
 842         return;
 843     }
 844     GET_ARENA_PTR(handle)->hOwner = hOwner;
 845 }
 846
 847
 848 /***********************************************************************
 849  *           FarGetOwner   (KERNEL.404)
 850  */
 851 HANDLE16 WINAPI FarGetOwner16( HGLOBAL16 handle )
 852 {
 853     if (!VALID_HANDLE(handle)) {
 854         WARN("Invalid handle 0x%04x passed to FarGetOwner!\n",handle);
 855         return 0;
 856     }
 857     return GET_ARENA_PTR(handle)->hOwner;
 858 }
 859
 860
 861 /***********************************************************************
 862  *           GlobalHandleToSel   (TOOLHELP.50)
 863  */
 864 WORD WINAPI GlobalHandleToSel16( HGLOBAL16 handle )
 865 {
 866     if (!handle) return 0;
 867     if (!VALID_HANDLE(handle)) {
 868         WARN("Invalid handle 0x%04x passed to GlobalHandleToSel!\n",handle);
 869         return 0;
 870     }
 871     if (!(handle & 7))
 872     {
 873         WARN("Program attempted invalid selector conversion\n" );
 874         return handle - 1;
 875     }
 876     return handle | 7;
 877 }
 878
 879
 880 /***********************************************************************
 881  *           GlobalFirst   (TOOLHELP.51)
 882  */
 883 BOOL16 WINAPI GlobalFirst16( GLOBALENTRY *pGlobal, WORD wFlags )
 884 {
 885     if (wFlags == GLOBAL_LRU) return FALSE;
 886     pGlobal->dwNext = 0;
 887     return GlobalNext16( pGlobal, wFlags );
 888 }
 889
 890
 891 /***********************************************************************
 892  *           GlobalNext   (TOOLHELP.52)
 893  */
 894 BOOL16 WINAPI GlobalNext16( GLOBALENTRY *pGlobal, WORD wFlags)
 895 {
 896     GLOBALARENA *pArena;
 897
 898     if (pGlobal->dwNext >= globalArenaSize) return FALSE;
 899     pArena = pGlobalArena + pGlobal->dwNext;
 900     if (wFlags == GLOBAL_FREE)  /* only free blocks */
 901     {
 902         int i;
 903         for (i = pGlobal->dwNext; i < globalArenaSize; i++, pArena++)
 904             if (pArena->size == 0) break;  /* block is free */
 905         if (i >= globalArenaSize) return FALSE;
 906         pGlobal->dwNext = i;
 907     }
 908
 909     pGlobal->dwAddress    = pArena->base;
 910     pGlobal->dwBlockSize  = pArena->size;
 911     pGlobal->hBlock       = pArena->handle;
 912     pGlobal->wcLock       = pArena->lockCount;
 913     pGlobal->wcPageLock   = pArena->pageLockCount;
 914     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
 915     pGlobal->wHeapPresent = FALSE;
 916     pGlobal->hOwner       = pArena->hOwner;
 917     pGlobal->wType        = GT_UNKNOWN;
 918     pGlobal->wData        = 0;
 919     pGlobal->dwNext++;
 920     return TRUE;
 921 }
 922
 923
 924 /***********************************************************************
 925  *           GlobalInfo   (TOOLHELP.53)
 926  */
 927 BOOL16 WINAPI GlobalInfo16( GLOBALINFO *pInfo )
 928 {
 929     int i;
 930     GLOBALARENA *pArena;
 931
 932     pInfo->wcItems = globalArenaSize;
 933     pInfo->wcItemsFree = 0;
 934     pInfo->wcItemsLRU = 0;
 935     for (i = 0, pArena = pGlobalArena; i < globalArenaSize; i++, pArena++)
 936         if (pArena->size == 0) pInfo->wcItemsFree++;
 937     return TRUE;
 938 }
 939
 940
 941 /***********************************************************************
 942  *           GlobalEntryHandle   (TOOLHELP.54)
 943  */
 944 BOOL16 WINAPI GlobalEntryHandle16( GLOBALENTRY *pGlobal, HGLOBAL16 hItem )
 945 {
 946     GLOBALARENA *pArena = GET_ARENA_PTR(hItem);
 947
 948     pGlobal->dwAddress    = pArena->base;
 949     pGlobal->dwBlockSize  = pArena->size;
 950     pGlobal->hBlock       = pArena->handle;
 951     pGlobal->wcLock       = pArena->lockCount;
 952     pGlobal->wcPageLock   = pArena->pageLockCount;
 953     pGlobal->wFlags       = (GetCurrentPDB16() == pArena->hOwner);
 954     pGlobal->wHeapPresent = FALSE;
 955     pGlobal->hOwner       = pArena->hOwner;
 956     pGlobal->wType        = GT_UNKNOWN;
 957     pGlobal->wData        = 0;
 958     pGlobal->dwNext++;
 959     return TRUE;
 960 }
 961
 962
 963 /***********************************************************************
 964  *           GlobalEntryModule   (TOOLHELP.55)
 965  */
 966 BOOL16 WINAPI GlobalEntryModule16( GLOBALENTRY *pGlobal, HMODULE16 hModule,
 967                                  WORD wSeg )
 968 {
 969     FIXME("(%p, 0x%04x, 0x%04x), stub.\n", pGlobal, hModule, wSeg);
 970     return FALSE;
 971 }
 972
 973
 974 /***********************************************************************
 975  *           MemManInfo   (TOOLHELP.72)
 976  */
 977 BOOL16 WINAPI MemManInfo16( MEMMANINFO *info )
 978 {
 979     MEMORYSTATUS status;
 980
 981     /*
 982      * Not unsurprisingly although the documention says you
 983      * _must_ provide the size in the dwSize field, this function
 984      * (under Windows) always fills the structure and returns true.
 985      */
 986     GlobalMemoryStatus( &status );
 987     info->wPageSize            = getpagesize();
 988     info->dwLargestFreeBlock   = status.dwAvailVirtual;
 989     info->dwMaxPagesAvailable  = info->dwLargestFreeBlock / info->wPageSize;
 990     info->dwMaxPagesLockable   = info->dwMaxPagesAvailable;
 991     info->dwTotalLinearSpace   = status.dwTotalVirtual / info->wPageSize;
 992     info->dwTotalUnlockedPages = info->dwTotalLinearSpace;
 993     info->dwFreePages          = info->dwMaxPagesAvailable;
 994     info->dwTotalPages         = info->dwTotalLinearSpace;
 995     info->dwFreeLinearSpace    = info->dwMaxPagesAvailable;
 996     info->dwSwapFilePages      = status.dwTotalPageFile / info->wPageSize;
 997     return TRUE;
 998 }
 999
1000 /***********************************************************************
1001  *           GetFreeMemInfo   (KERNEL.316)
1002  */
1003 DWORD WINAPI GetFreeMemInfo16(void)
1004 {
1005     MEMMANINFO info;
1006     MemManInfo16( &info );
1007     return MAKELONG( info.dwTotalLinearSpace, info.dwMaxPagesAvailable );
1008 }
1009
1010 /*
1011  * Win32 Global heap functions (GlobalXXX).
1012  * These functions included in Win32 for compatibility with 16 bit Windows
1013  * Especially the moveable blocks and handles are oldish.
1014  * But the ability to directly allocate memory with GPTR and LPTR is widely
1015  * used.
1016  *
1017  * The handle stuff looks horrible, but it's implemented almost like Win95
1018  * does it.
1019  *
1020  */
1021
1022 #define MAGIC_GLOBAL_USED 0x5342
1023 #define GLOBAL_LOCK_MAX   0xFF
1024 #define HANDLE_TO_INTERN(h)  ((PGLOBAL32_INTERN)(((char *)(h))-2))
1025 #define INTERN_TO_HANDLE(i)  ((HGLOBAL) &((i)->Pointer))
1026 #define POINTER_TO_HANDLE(p) (*(((HGLOBAL *)(p))-1))
1027 #define ISHANDLE(h)          (((DWORD)(h)&2)!=0)
1028 #define ISPOINTER(h)         (((DWORD)(h)&2)==0)
1029
1030 typedef struct __GLOBAL32_INTERN
1031 {
1032    WORD         Magic;
1033    LPVOID       Pointer WINE_PACKED;
1034    BYTE         Flags;
1035    BYTE         LockCount;
1036 } GLOBAL32_INTERN, *PGLOBAL32_INTERN;
1037
1038
1039 /***********************************************************************
1040  *           GlobalAlloc   (KERNEL32.@)
1041  * RETURNS
1042  *      Handle: Success
1043  *      NULL: Failure
1044  */
1045 HGLOBAL WINAPI GlobalAlloc(
1046                  UINT flags, /* [in] Object allocation attributes */
1047                  SIZE_T size /* [in] Number of bytes to allocate */
1048 ) {
1049    PGLOBAL32_INTERN     pintern;
1050    DWORD                hpflags;
1051    LPVOID               palloc;
1052
1053    if(flags&GMEM_ZEROINIT)
1054       hpflags=HEAP_ZERO_MEMORY;
1055    else
1056       hpflags=0;
1057
1058    TRACE("() flags=%04x\n",  flags );
1059
1060    if((flags & GMEM_MOVEABLE)==0) /* POINTER */
1061    {
1062       palloc=HeapAlloc(GetProcessHeap(), hpflags, size);
1063       return (HGLOBAL) palloc;
1064    }
1065    else  /* HANDLE */
1066    {
1067       /* HeapLock(heap); */
1068
1069       pintern=HeapAlloc(GetProcessHeap(), 0,  sizeof(GLOBAL32_INTERN));
1070       if (!pintern) return 0;
1071       if(size)
1072       {
1073          if (!(palloc=HeapAlloc(GetProcessHeap(), hpflags, size+sizeof(HGLOBAL)))) {
1074             HeapFree(GetProcessHeap(), 0, pintern);
1075             return 0;
1076          }
1077          *(HGLOBAL *)palloc=INTERN_TO_HANDLE(pintern);
1078          pintern->Pointer=(char *) palloc+sizeof(HGLOBAL);
1079       }
1080       else
1081          pintern->Pointer=NULL;
1082       pintern->Magic=MAGIC_GLOBAL_USED;
1083       pintern->Flags=flags>>8;
1084       pintern->LockCount=0;
1085
1086       /* HeapUnlock(heap); */
1087
1088       return INTERN_TO_HANDLE(pintern);
1089    }
1090 }
1091
1092
1093 /***********************************************************************
1094  *           GlobalLock   (KERNEL32.@)
1095  * RETURNS
1096  *      Pointer to first byte of block
1097  *      NULL: Failure
1098  */
1099 LPVOID WINAPI GlobalLock(
1100               HGLOBAL hmem /* [in] Handle of global memory object */
1101 ) {
1102    PGLOBAL32_INTERN pintern;
1103    LPVOID           palloc;
1104
1105    if(ISPOINTER(hmem))
1106       return (LPVOID) hmem;
1107
1108    /* HeapLock(GetProcessHeap()); */
1109
1110    pintern=HANDLE_TO_INTERN(hmem);
1111    if(pintern->Magic==MAGIC_GLOBAL_USED)
1112    {
1113       if(pintern->LockCount<GLOBAL_LOCK_MAX)
1114          pintern->LockCount++;
1115       palloc=pintern->Pointer;
1116    }
1117    else
1118    {
1119       WARN("invalid handle\n");
1120       palloc=(LPVOID) NULL;
1121       SetLastError(ERROR_INVALID_HANDLE);
1122    }
1123    /* HeapUnlock(GetProcessHeap()); */;
1124    return palloc;
1125 }
1126
1127
1128 /***********************************************************************
1129  *           GlobalUnlock   (KERNEL32.@)
1130  * RETURNS
1131  *      TRUE: Object is still locked
1132  *      FALSE: Object is unlocked
1133  */
1134 BOOL WINAPI GlobalUnlock(
1135               HGLOBAL hmem /* [in] Handle of global memory object */
1136 ) {
1137     PGLOBAL32_INTERN pintern;
1138     BOOL locked;
1139
1140     if (ISPOINTER(hmem)) return FALSE;
1141
1142     __TRY
1143     {
1144         /* HeapLock(GetProcessHeap()); */
1145         pintern=HANDLE_TO_INTERN(hmem);
1146         if(pintern->Magic==MAGIC_GLOBAL_USED)
1147         {
1148             if((pintern->LockCount<GLOBAL_LOCK_MAX)&&(pintern->LockCount>0))
1149                 pintern->LockCount--;
1150
1151             locked = (pintern->LockCount != 0);
1152             if (!locked) SetLastError(NO_ERROR);
1153         }
1154         else
1155         {
1156             WARN("invalid handle\n");
1157             SetLastError(ERROR_INVALID_HANDLE);
1158             locked=FALSE;
1159         }
1160         /* HeapUnlock(GetProcessHeap()); */
1161     }
1162     __EXCEPT(page_fault)
1163     {
1164         ERR("page fault occurred ! Caused by bug ?\n");
1165         SetLastError( ERROR_INVALID_PARAMETER );
1166         return FALSE;
1167     }
1168     __ENDTRY
1169     return locked;
1170 }
1171
1172
1173 /***********************************************************************
1174  *           GlobalHandle   (KERNEL32.@)
1175  * Returns the handle associated with the specified pointer.
1176  *
1177  * RETURNS
1178  *      Handle: Success
1179  *      NULL: Failure
1180  */
1181 HGLOBAL WINAPI GlobalHandle(
1182                  LPCVOID pmem /* [in] Pointer to global memory block */
1183 ) {
1184     HGLOBAL handle;
1185     PGLOBAL32_INTERN  maybe_intern;
1186     LPCVOID test;
1187
1188     if (!pmem)
1189     {
1190         SetLastError( ERROR_INVALID_PARAMETER );
1191         return 0;
1192     }
1193
1194     __TRY
1195     {
1196         handle = 0;
1197
1198         /* note that if pmem is a pointer to a a block allocated by        */
1199         /* GlobalAlloc with GMEM_MOVEABLE then magic test in HeapValidate  */
1200         /* will fail.                                                      */
1201         if (ISPOINTER(pmem)) {
1202             if (HeapValidate( GetProcessHeap(), 0, pmem )) {
1203                 handle = (HGLOBAL)pmem;  /* valid fixed block */
1204                 break;
1205             }
1206             handle = POINTER_TO_HANDLE(pmem);
1207         } else
1208             handle = (HGLOBAL)pmem;
1209
1210         /* Now test handle either passed in or retrieved from pointer */
1211         maybe_intern = HANDLE_TO_INTERN( handle );
1212         if (maybe_intern->Magic == MAGIC_GLOBAL_USED) {
1213             test = maybe_intern->Pointer;
1214             if (HeapValidate( GetProcessHeap(), 0, ((HGLOBAL *)test)-1 ) && /* obj(-handle) valid arena? */
1215                 HeapValidate( GetProcessHeap(), 0, maybe_intern ))  /* intern valid arena? */
1216                 break;  /* valid moveable block */
1217         }
1218         handle = 0;
1219         SetLastError( ERROR_INVALID_HANDLE );
1220     }
1221     __EXCEPT(page_fault)
1222     {
1223         SetLastError( ERROR_INVALID_HANDLE );
1224         return 0;
1225     }
1226     __ENDTRY
1227
1228     return handle;
1229 }
1230
1231
1232 /***********************************************************************
1233  *           GlobalReAlloc   (KERNEL32.@)
1234  * RETURNS
1235  *      Handle: Success
1236  *      NULL: Failure
1237  */
1238 HGLOBAL WINAPI GlobalReAlloc(
1239                  HGLOBAL hmem, /* [in] Handle of global memory object */
1240                  SIZE_T size,  /* [in] New size of block */
1241                  UINT flags    /* [in] How to reallocate object */
1242 ) {
1243    LPVOID               palloc;
1244    HGLOBAL            hnew;
1245    PGLOBAL32_INTERN     pintern;
1246    DWORD heap_flags = (flags & GMEM_ZEROINIT) ? HEAP_ZERO_MEMORY : 0;
1247
1248    hnew = 0;
1249    /* HeapLock(heap); */
1250    if(flags & GMEM_MODIFY) /* modify flags */
1251    {
1252       if( ISPOINTER(hmem) && (flags & GMEM_MOVEABLE))
1253       {
1254          /* make a fixed block moveable
1255           * actually only NT is able to do this. But it's soo simple
1256           */
1257          if (hmem == 0)
1258          {
1259              ERR("GlobalReAlloc32 with null handle!\n");
1260              SetLastError( ERROR_NOACCESS );
1261              return 0;
1262          }
1263          size=HeapSize(GetProcessHeap(), 0, (LPVOID) hmem);
1264          hnew=GlobalAlloc( flags, size);
1265          palloc=GlobalLock(hnew);
1266          memcpy(palloc, (LPVOID) hmem, size);
1267          GlobalUnlock(hnew);
1268          GlobalFree(hmem);
1269       }
1270       else if( ISPOINTER(hmem) &&(flags & GMEM_DISCARDABLE))
1271       {
1272          /* change the flags to make our block "discardable" */
1273          pintern=HANDLE_TO_INTERN(hmem);
1274          pintern->Flags = pintern->Flags | (GMEM_DISCARDABLE >> 8);
1275          hnew=hmem;
1276       }
1277       else
1278       {
1279          SetLastError(ERROR_INVALID_PARAMETER);
1280          hnew = 0;
1281       }
1282    }
1283    else
1284    {
1285       if(ISPOINTER(hmem))
1286       {
1287          /* reallocate fixed memory */
1288          hnew=(HGLOBAL)HeapReAlloc(GetProcessHeap(), heap_flags, (LPVOID) hmem, size);
1289       }
1290       else
1291       {
1292          /* reallocate a moveable block */
1293          pintern=HANDLE_TO_INTERN(hmem);
1294
1295 #if 0
1296 /* Apparently Windows doesn't care whether the handle is locked at this point */
1297 /* See also the same comment in GlobalFree() */
1298          if(pintern->LockCount>1) {
1299             ERR("handle 0x%08lx is still locked, cannot realloc!\n",(DWORD)hmem);
1300             SetLastError(ERROR_INVALID_HANDLE);
1301          } else
1302 #endif
1303          if(size!=0)
1304          {
1305             hnew=hmem;
1306             if(pintern->Pointer)
1307             {
1308                if((palloc = HeapReAlloc(GetProcessHeap(), heap_flags,
1309                                    (char *) pintern->Pointer-sizeof(HGLOBAL),
1310                                    size+sizeof(HGLOBAL))) == NULL)
1311                    return 0; /* Block still valid */
1312                pintern->Pointer=(char *) palloc+sizeof(HGLOBAL);
1313             }
1314             else
1315             {
1316                 if((palloc=HeapAlloc(GetProcessHeap(), heap_flags, size+sizeof(HGLOBAL)))
1317                    == NULL)
1318                     return 0;
1319                *(HGLOBAL *)palloc=hmem;
1320                pintern->Pointer=(char *) palloc+sizeof(HGLOBAL);
1321             }
1322          }
1323          else
1324          {
1325             if(pintern->Pointer)
1326             {
1327                HeapFree(GetProcessHeap(), 0, (char *) pintern->Pointer-sizeof(HGLOBAL));
1328                pintern->Pointer=NULL;
1329             }
1330          }
1331       }
1332    }
1333    /* HeapUnlock(heap); */
1334    return hnew;
1335 }
1336
1337
1338 /***********************************************************************
1339  *           GlobalFree   (KERNEL32.@)
1340  * RETURNS
1341  *      NULL: Success
1342  *      Handle: Failure
1343  */
1344 HGLOBAL WINAPI GlobalFree(
1345                  HGLOBAL hmem /* [in] Handle of global memory object */
1346 ) {
1347     PGLOBAL32_INTERN pintern;
1348     HGLOBAL hreturned;
1349
1350     __TRY
1351     {
1352         hreturned = 0;
1353         if(ISPOINTER(hmem)) /* POINTER */
1354         {
1355             if(!HeapFree(GetProcessHeap(), 0, (LPVOID) hmem)) hmem = 0;
1356         }
1357         else  /* HANDLE */
1358         {
1359             /* HeapLock(heap); */
1360             pintern=HANDLE_TO_INTERN(hmem);
1361
1362             if(pintern->Magic==MAGIC_GLOBAL_USED)
1363             {
1364
1365                 /* WIN98 does not make this test. That is you can free a */
1366                 /* block you have not unlocked. Go figure!!              */
1367                 /* if(pintern->LockCount!=0)  */
1368                 /*    SetLastError(ERROR_INVALID_HANDLE);  */
1369
1370                 if(pintern->Pointer)
1371                     if(!HeapFree(GetProcessHeap(), 0, (char *)(pintern->Pointer)-sizeof(HGLOBAL)))
1372                         hreturned=hmem;
1373                 if(!HeapFree(GetProcessHeap(), 0, pintern))
1374                     hreturned=hmem;
1375             }
1376             /* HeapUnlock(heap); */
1377         }
1378     }
1379     __EXCEPT(page_fault)
1380     {
1381         ERR("page fault occurred ! Caused by bug ?\n");
1382         SetLastError( ERROR_INVALID_PARAMETER );
1383         return hmem;
1384     }
1385     __ENDTRY
1386     return hreturned;
1387 }
1388
1389
1390 /***********************************************************************
1391  *           GlobalSize   (KERNEL32.@)
1392  * RETURNS
1393  *      Size in bytes of the global memory object
1394  *      0: Failure
1395  */
1396 SIZE_T WINAPI GlobalSize(
1397              HGLOBAL hmem /* [in] Handle of global memory object */
1398 ) {
1399    DWORD                retval;
1400    PGLOBAL32_INTERN     pintern;
1401
1402    if(ISPOINTER(hmem))
1403    {
1404       retval=HeapSize(GetProcessHeap(), 0,  (LPVOID) hmem);
1405    }
1406    else
1407    {
1408       /* HeapLock(heap); */
1409       pintern=HANDLE_TO_INTERN(hmem);
1410
1411       if(pintern->Magic==MAGIC_GLOBAL_USED)
1412       {
1413         if (!pintern->Pointer) /* handle case of GlobalAlloc( ??,0) */
1414             return 0;
1415          retval=HeapSize(GetProcessHeap(), 0,
1416                          (char *)(pintern->Pointer)-sizeof(HGLOBAL))-4;
1417          if (retval == 0xffffffff-4) retval = 0;
1418       }
1419       else
1420       {
1421          WARN("invalid handle\n");
1422          retval=0;
1423       }
1424       /* HeapUnlock(heap); */
1425    }
1426    /* HeapSize returns 0xffffffff on failure */
1427    if (retval == 0xffffffff) retval = 0;
1428    return retval;
1429 }
1430
1431
1432 /***********************************************************************
1433  *           GlobalWire   (KERNEL32.@)
1434  */
1435 LPVOID WINAPI GlobalWire(HGLOBAL hmem)
1436 {
1437    return GlobalLock( hmem );
1438 }
1439
1440
1441 /***********************************************************************
1442  *           GlobalUnWire   (KERNEL32.@)
1443  */
1444 BOOL WINAPI GlobalUnWire(HGLOBAL hmem)
1445 {
1446    return GlobalUnlock( hmem);
1447 }
1448
1449
1450 /***********************************************************************
1451  *           GlobalFix   (KERNEL32.@)
1452  */
1453 VOID WINAPI GlobalFix(HGLOBAL hmem)
1454 {
1455     GlobalLock( hmem );
1456 }
1457
1458
1459 /***********************************************************************
1460  *           GlobalUnfix   (KERNEL32.@)
1461  */
1462 VOID WINAPI GlobalUnfix(HGLOBAL hmem)
1463 {
1464    GlobalUnlock( hmem);
1465 }
1466
1467
1468 /***********************************************************************
1469  *           GlobalFlags   (KERNEL32.@)
1470  * Returns information about the specified global memory object
1471  *
1472  * NOTES
1473  *      Should this return GMEM_INVALID_HANDLE on invalid handle?
1474  *
1475  * RETURNS
1476  *      Value specifying allocation flags and lock count
1477  *      GMEM_INVALID_HANDLE: Failure
1478  */
1479 UINT WINAPI GlobalFlags(
1480               HGLOBAL hmem /* [in] Handle to global memory object */
1481 ) {
1482    DWORD                retval;
1483    PGLOBAL32_INTERN     pintern;
1484
1485    if(ISPOINTER(hmem))
1486    {
1487       retval=0;
1488    }
1489    else
1490    {
1491       /* HeapLock(GetProcessHeap()); */
1492       pintern=HANDLE_TO_INTERN(hmem);
1493       if(pintern->Magic==MAGIC_GLOBAL_USED)
1494       {
1495          retval=pintern->LockCount + (pintern->Flags<<8);
1496          if(pintern->Pointer==0)
1497             retval|= GMEM_DISCARDED;
1498       }
1499       else
1500       {
1501          WARN("Invalid handle: %p\n", hmem);
1502          retval=0;
1503       }
1504       /* HeapUnlock(GetProcessHeap()); */
1505    }
1506    return retval;
1507 }
1508
1509
1510 /***********************************************************************
1511  *           GlobalCompact   (KERNEL32.@)
1512  */
1513 SIZE_T WINAPI GlobalCompact( DWORD minfree )
1514 {
1515     return 0;  /* GlobalCompact does nothing in Win32 */
1516 }
1517
1518
1519 /***********************************************************************
1520  *           GlobalMemoryStatus   (KERNEL32.@)
1521  * RETURNS
1522  *      None
1523  */
1524 VOID WINAPI GlobalMemoryStatus(
1525             LPMEMORYSTATUS lpmem
1526 ) {
1527     static MEMORYSTATUS cached_memstatus;
1528     static int cache_lastchecked = 0;
1529     SYSTEM_INFO si;
1530 #ifdef linux
1531     FILE *f;
1532 #endif
1533 #ifdef __FreeBSD__
1534     int *tmp;
1535     int size_sys;
1536 #endif
1537     if (time(NULL)==cache_lastchecked) {
1538         memcpy(lpmem,&cached_memstatus,sizeof(MEMORYSTATUS));
1539         return;
1540     }
1541     cache_lastchecked = time(NULL);
1542
1543     lpmem->dwMemoryLoad    = 0;
1544     lpmem->dwTotalPhys     = 16*1024*1024;
1545     lpmem->dwAvailPhys     = 16*1024*1024;
1546     lpmem->dwTotalPageFile = 16*1024*1024;
1547     lpmem->dwAvailPageFile = 16*1024*1024;
1548
1549 #ifdef linux
1550     f = fopen( "/proc/meminfo", "r" );
1551     if (f)
1552     {
1553         char buffer[256];
1554         int total, used, free, shared, buffers, cached;
1555
1556         lpmem->dwLength = sizeof(MEMORYSTATUS);
1557         lpmem->dwTotalPhys = lpmem->dwAvailPhys = 0;
1558         lpmem->dwTotalPageFile = lpmem->dwAvailPageFile = 0;
1559         while (fgets( buffer, sizeof(buffer), f ))
1560         {
1561             /* old style /proc/meminfo ... */
1562             if (sscanf( buffer, "Mem: %d %d %d %d %d %d", &total, &used, &free, &shared, &buffers, &cached ))
1563             {
1564                 lpmem->dwTotalPhys += total;
1565                 lpmem->dwAvailPhys += free + buffers + cached;
1566             }
1567             if (sscanf( buffer, "Swap: %d %d %d", &total, &used, &free ))
1568             {
1569                 lpmem->dwTotalPageFile += total;
1570                 lpmem->dwAvailPageFile += free;
1571             }
1572
1573             /* new style /proc/meminfo ... */
1574             if (sscanf(buffer, "MemTotal: %d", &total))
1575                 lpmem->dwTotalPhys = total*1024;
1576             if (sscanf(buffer, "MemFree: %d", &free))
1577                 lpmem->dwAvailPhys = free*1024;
1578             if (sscanf(buffer, "SwapTotal: %d", &total))
1579                 lpmem->dwTotalPageFile = total*1024;
1580             if (sscanf(buffer, "SwapFree: %d", &free))
1581                 lpmem->dwAvailPageFile = free*1024;
1582             if (sscanf(buffer, "Buffers: %d", &buffers))
1583                 lpmem->dwAvailPhys += buffers*1024;
1584             if (sscanf(buffer, "Cached: %d", &cached))
1585                 lpmem->dwAvailPhys += cached*1024;
1586         }
1587         fclose( f );
1588
1589         if (lpmem->dwTotalPhys)
1590         {
1591             DWORD TotalPhysical = lpmem->dwTotalPhys+lpmem->dwTotalPageFile;
1592             DWORD AvailPhysical = lpmem->dwAvailPhys+lpmem->dwAvailPageFile;
1593             lpmem->dwMemoryLoad = (TotalPhysical-AvailPhysical)
1594                                       / (TotalPhysical / 100);
1595         }
1596     }
1597 #elif defined(__FreeBSD__)
1598     sysctlbyname("hw.physmem", NULL, &size_sys, NULL, 0);
1599     tmp = malloc(size_sys * sizeof(int));
1600     sysctlbyname("hw.physmem", tmp, &size_sys, NULL, 0);
1601     if (tmp && *tmp)
1602     {
1603         lpmem->dwTotalPhys = *tmp;
1604         free(tmp);
1605         sysctlbyname("hw.usermem", NULL, &size_sys, NULL, 0);
1606         tmp = malloc(size_sys * sizeof(int));
1607         sysctlbyname("hw.usermem", tmp, &size_sys, NULL, 0);
1608         if (tmp && *tmp)
1609         {
1610             lpmem->dwAvailPhys = *tmp;
1611             lpmem->dwTotalPageFile = *tmp;
1612             lpmem->dwAvailPageFile = *tmp;
1613             lpmem->dwMemoryLoad = lpmem->dwTotalPhys - lpmem->dwAvailPhys;
1614         } else
1615         {
1616             lpmem->dwAvailPhys = lpmem->dwTotalPhys;
1617             lpmem->dwTotalPageFile = lpmem->dwTotalPhys;
1618             lpmem->dwAvailPageFile = lpmem->dwTotalPhys;
1619             lpmem->dwMemoryLoad = 0;
1620         }
1621         free(tmp);
1622
1623     }
1624 #endif
1625     /* Some applications (e.g. QuickTime 6) crash if we tell them there
1626      * is more than 2GB of physical memory.
1627      */
1628     if (lpmem->dwTotalPhys>2U*1024*1024*1024)
1629     {
1630         lpmem->dwTotalPhys=2U*1024*1024*1024;
1631         lpmem->dwAvailPhys=2U*1024*1024*1024;
1632     }
1633
1634     /* FIXME: should do something for other systems */
1635     GetSystemInfo(&si);
1636     lpmem->dwTotalVirtual  = (char*)si.lpMaximumApplicationAddress-(char*)si.lpMinimumApplicationAddress;
1637     /* FIXME: we should track down all the already allocated VM pages and substract them, for now arbitrarily remove 64KB so that it matches NT */
1638     lpmem->dwAvailVirtual  = lpmem->dwTotalVirtual-64*1024;
1639     memcpy(&cached_memstatus,lpmem,sizeof(MEMORYSTATUS));
1640
1641     /* it appears some memory display programs want to divide by these values */
1642     if(lpmem->dwTotalPageFile==0)
1643         lpmem->dwTotalPageFile++;
1644
1645     if(lpmem->dwAvailPageFile==0)
1646         lpmem->dwAvailPageFile++;
1647
1648     TRACE("<-- LPMEMORYSTATUS: dwLength %ld, dwMemoryLoad %ld, dwTotalPhys %ld, dwAvailPhys %ld,"
1649           " dwTotalPageFile %ld, dwAvailPageFile %ld, dwTotalVirtual %ld, dwAvailVirtual %ld\n",
1650           lpmem->dwLength, lpmem->dwMemoryLoad, lpmem->dwTotalPhys, lpmem->dwAvailPhys,
1651           lpmem->dwTotalPageFile, lpmem->dwAvailPageFile, lpmem->dwTotalVirtual,
1652           lpmem->dwAvailVirtual);
1653 }
1654
1655 /***********************************************************************
1656  *           A20Proc   (KERNEL.165)
1657  *           A20_Proc  (SYSTEM.20)
1658  */
1659 void WINAPI A20Proc16( WORD unused )
1660 {
1661     /* this is also a NOP in Windows */
1662 }
1663
1664 /***********************************************************************
1665  *           LimitEMSPages   (KERNEL.156)
1666  */
1667 DWORD WINAPI LimitEMSPages16( DWORD unused )
1668 {
1669     return 0;
1670 }