dlls/kernel32/task.c

   1 /*
   2  * Task 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <assert.h>
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif
  31
  32 #include "windef.h"
  33 #include "winbase.h"
  34 #include "wingdi.h"
  35 #include "winnt.h"
  36 #include "wownt32.h"
  37 #include "winuser.h"
  38
  39 #include "wine/winbase16.h"
  40 #include "thread.h"
  41 #include "winternl.h"
  42 #include "toolhelp.h"
  43 #include "kernel_private.h"
  44 #include "kernel16_private.h"
  45
  46 #include "wine/debug.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(task);
  49 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
  50
  51 #include "pshpack1.h"
  52
  53 /* Segment containing MakeProcInstance() thunks */
  54 typedef struct
  55 {
  56     WORD  next;       /* Selector of next segment */
  57     WORD  magic;      /* Thunks signature */
  58     WORD  unused;
  59     WORD  free;       /* Head of the free list */
  60     WORD  thunks[4];  /* Each thunk is 4 words long */
  61 } THUNKS;
  62
  63 #include "poppack.h"
  64
  65 #define THUNK_MAGIC  ('P' | ('T' << 8))
  66
  67   /* Min. number of thunks allocated when creating a new segment */
  68 #define MIN_THUNKS  32
  69
  70 #define TDB_MAGIC    ('T' | ('D' << 8))
  71
  72 static THHOOK DefaultThhook;
  73 THHOOK *pThhook = &DefaultThhook;
  74
  75 #define hFirstTask   (pThhook->HeadTDB)
  76 #define hLockedTask  (pThhook->LockTDB)
  77
  78 static UINT16 nTaskCount = 0;
  79
  80 static HTASK16 initial_task, main_task;
  81
  82 /***********************************************************************
  83  *           TASK_InstallTHHook
  84  */
  85 void TASK_InstallTHHook( THHOOK *pNewThhook )
  86 {
  87      THHOOK *pOldThhook = pThhook;
  88
  89      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  90
  91      *pThhook = *pOldThhook;
  92 }
  93
  94 /***********************************************************************
  95  *           TASK_GetPtr
  96  */
  97 static TDB *TASK_GetPtr( HTASK16 hTask )
  98 {
  99     return GlobalLock16( hTask );
 100 }
 101
 102
 103 /***********************************************************************
 104  *           TASK_GetCurrent
 105  */
 106 TDB *TASK_GetCurrent(void)
 107 {
 108     return TASK_GetPtr( GetCurrentTask() );
 109 }
 110
 111
 112 /***********************************************************************
 113  *           TASK_LinkTask
 114  */
 115 static void TASK_LinkTask( HTASK16 hTask )
 116 {
 117     HTASK16 *prevTask;
 118     TDB *pTask;
 119
 120     if (!(pTask = TASK_GetPtr( hTask ))) return;
 121     prevTask = &hFirstTask;
 122     while (*prevTask)
 123     {
 124         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 125         if (prevTaskPtr->priority >= pTask->priority) break;
 126         prevTask = &prevTaskPtr->hNext;
 127     }
 128     pTask->hNext = *prevTask;
 129     *prevTask = hTask;
 130     nTaskCount++;
 131 }
 132
 133
 134 /***********************************************************************
 135  *           TASK_UnlinkTask
 136  */
 137 static void TASK_UnlinkTask( HTASK16 hTask )
 138 {
 139     HTASK16 *prevTask;
 140     TDB *pTask;
 141
 142     prevTask = &hFirstTask;
 143     while (*prevTask && (*prevTask != hTask))
 144     {
 145         pTask = TASK_GetPtr( *prevTask );
 146         prevTask = &pTask->hNext;
 147     }
 148     if (*prevTask)
 149     {
 150         pTask = TASK_GetPtr( *prevTask );
 151         *prevTask = pTask->hNext;
 152         pTask->hNext = 0;
 153         nTaskCount--;
 154     }
 155 }
 156
 157
 158 /***********************************************************************
 159  *           TASK_CreateThunks
 160  *
 161  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 162  * and containing 'count' entries.
 163  */
 164 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 165 {
 166     int i;
 167     WORD free;
 168     THUNKS *pThunk;
 169
 170     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 171     pThunk->next = 0;
 172     pThunk->magic = THUNK_MAGIC;
 173     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 174     free = pThunk->free;
 175     for (i = 0; i < count-1; i++)
 176     {
 177         free += 8;  /* Offset of next thunk */
 178         pThunk->thunks[4*i] = free;
 179     }
 180     pThunk->thunks[4*i] = 0;  /* Last thunk */
 181 }
 182
 183
 184 /***********************************************************************
 185  *           TASK_AllocThunk
 186  *
 187  * Allocate a thunk for MakeProcInstance().
 188  */
 189 static SEGPTR TASK_AllocThunk(void)
 190 {
 191     TDB *pTask;
 192     THUNKS *pThunk;
 193     WORD sel, base;
 194
 195     if (!(pTask = TASK_GetCurrent())) return 0;
 196     sel = pTask->hCSAlias;
 197     pThunk = (THUNKS *)&pTask->thunks;
 198     base = (char *)pThunk - (char *)pTask;
 199     while (!pThunk->free)
 200     {
 201         sel = pThunk->next;
 202         if (!sel)  /* Allocate a new segment */
 203         {
 204             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 205                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 206             if (!sel) return (SEGPTR)0;
 207             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 208             pThunk->next = sel;
 209         }
 210         pThunk = (THUNKS *)GlobalLock16( sel );
 211         base = 0;
 212     }
 213     base += pThunk->free;
 214     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 215     return MAKESEGPTR( sel, base );
 216 }
 217
 218
 219 /***********************************************************************
 220  *           TASK_FreeThunk
 221  *
 222  * Free a MakeProcInstance() thunk.
 223  */
 224 static BOOL TASK_FreeThunk( SEGPTR thunk )
 225 {
 226     TDB *pTask;
 227     THUNKS *pThunk;
 228     WORD sel, base;
 229
 230     if (!(pTask = TASK_GetCurrent())) return 0;
 231     sel = pTask->hCSAlias;
 232     pThunk = (THUNKS *)&pTask->thunks;
 233     base = (char *)pThunk - (char *)pTask;
 234     while (sel && (sel != HIWORD(thunk)))
 235     {
 236         sel = pThunk->next;
 237         pThunk = (THUNKS *)GlobalLock16( sel );
 238         base = 0;
 239     }
 240     if (!sel) return FALSE;
 241     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 242     pThunk->free = LOWORD(thunk) - base;
 243     return TRUE;
 244 }
 245
 246
 247 /***********************************************************************
 248  *           TASK_Create
 249  *
 250  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 251  *       to be careful to protect global data structures. We do this
 252  *       by entering the Win16Lock while linking the task into the
 253  *       global task list.
 254  */
 255 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
 256 {
 257     HTASK16 hTask;
 258     TDB *pTask;
 259     FARPROC16 proc;
 260     char curdir[MAX_PATH];
 261     HMODULE16 hModule = pModule ? pModule->self : 0;
 262
 263       /* Allocate the task structure */
 264
 265     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 266     if (!hTask) return NULL;
 267     pTask = TASK_GetPtr( hTask );
 268     FarSetOwner16( hTask, hModule );
 269
 270     /* Fill the task structure */
 271
 272     pTask->hSelf = hTask;
 273
 274     pTask->version       = pModule ? pModule->ne_expver : 0x0400;
 275     pTask->hModule       = hModule;
 276     pTask->hParent       = GetCurrentTask();
 277     pTask->magic         = TDB_MAGIC;
 278     pTask->nCmdShow      = cmdShow;
 279
 280     GetCurrentDirectoryA( sizeof(curdir), curdir );
 281     GetShortPathNameA( curdir, curdir, sizeof(curdir) );
 282     pTask->curdrive = (curdir[0] - 'A') | 0x80;
 283     lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
 284
 285       /* Create the thunks block */
 286
 287     TASK_CreateThunks( hTask, (char *)&pTask->thunks - (char *)pTask, 7 );
 288
 289       /* Copy the module name */
 290
 291     if (hModule)
 292     {
 293         char name[sizeof(pTask->module_name)+1];
 294         size_t len;
 295         GetModuleName16( hModule, name, sizeof(name) );
 296         len = strlen(name) + 1;
 297         memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
 298         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 299     }
 300
 301       /* Allocate a selector for the PDB */
 302
 303     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 304                                       hModule, WINE_LDT_FLAGS_DATA );
 305
 306       /* Fill the PDB */
 307
 308     pTask->pdb.int20 = 0x20cd;
 309     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 310     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 311     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 312     pTask->pdb.savedint22 = 0;
 313     pTask->pdb.savedint23 = 0;
 314     pTask->pdb.savedint24 = 0;
 315     pTask->pdb.fileHandlesPtr =
 316         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 317     pTask->pdb.hFileHandles = 0;
 318     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 319     /* FIXME: should we make a copy of the environment? */
 320     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 321     pTask->pdb.nbFiles        = 20;
 322
 323     /* Fill the command line */
 324
 325     if (!cmdline)
 326     {
 327         cmdline = GetCommandLineA();
 328         /* remove the first word (program name) */
 329         if (*cmdline == '"')
 330             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 331         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 332         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 333         len = strlen(cmdline);
 334     }
 335     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 336     pTask->pdb.cmdLine[0] = len;
 337     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 338     /* pTask->pdb.cmdLine[len+1] = 0; */
 339
 340     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 341
 342       /* Allocate a code segment alias for the TDB */
 343
 344     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 345                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 346
 347       /* Default DTA overwrites command line */
 348
 349     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 350
 351     /* Create scheduler event for 16-bit tasks */
 352
 353     if ( !(pTask->flags & TDBF_WIN32) )
 354         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 355
 356     if (!initial_task) initial_task = hTask;
 357
 358     return pTask;
 359 }
 360
 361
 362 /***********************************************************************
 363  *           TASK_DeleteTask
 364  */
 365 static void TASK_DeleteTask( HTASK16 hTask )
 366 {
 367     TDB *pTask;
 368     HGLOBAL16 hPDB;
 369
 370     if (!(pTask = TASK_GetPtr( hTask ))) return;
 371     hPDB = pTask->hPDB;
 372
 373     pTask->magic = 0xdead; /* invalidate signature */
 374
 375     /* Free the selector aliases */
 376
 377     GLOBAL_FreeBlock( pTask->hCSAlias );
 378     GLOBAL_FreeBlock( pTask->hPDB );
 379
 380     /* Free the task module */
 381
 382     FreeModule16( pTask->hModule );
 383
 384     /* Free the task structure itself */
 385
 386     GlobalFree16( hTask );
 387
 388     /* Free all memory used by this task (including the 32-bit stack, */
 389     /* the environment block and the thunk segments). */
 390
 391     GlobalFreeAll16( hPDB );
 392 }
 393
 394
 395 /***********************************************************************
 396  *           TASK_CreateMainTask
 397  *
 398  * Create a task for the main (32-bit) process.
 399  */
 400 void TASK_CreateMainTask(void)
 401 {
 402     TDB *pTask;
 403     STARTUPINFOA startup_info;
 404     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 405
 406     GetStartupInfoA( &startup_info );
 407     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 408     pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
 409     if (!pTask)
 410     {
 411         ERR("could not create task for main process\n");
 412         ExitProcess(1);
 413     }
 414
 415     pTask->flags        |= TDBF_WIN32;
 416     pTask->hInstance     = 0;
 417     pTask->hPrevInstance = 0;
 418     pTask->teb           = NtCurrentTeb();
 419
 420     /* Add the task to the linked list */
 421     /* (no need to get the win16 lock, we are the only thread at this point) */
 422     TASK_LinkTask( pTask->hSelf );
 423     main_task = pTask->hSelf;
 424 }
 425
 426
 427 struct create_data
 428 {
 429     TDB                 *task;
 430     WIN16_SUBSYSTEM_TIB *tib;
 431 };
 432
 433 /* allocate the win16 TIB for a new 16-bit task */
 434 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
 435 {
 436     WCHAR path[MAX_PATH];
 437     WIN16_SUBSYSTEM_TIB *tib;
 438     UNICODE_STRING *curdir;
 439     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 440
 441     if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
 442     MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 443     GetLongPathNameW( path, path, MAX_PATH );
 444     if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
 445     else tib->exe_name = NULL;
 446
 447     RtlAcquirePebLock();
 448     if (NtCurrentTeb()->Tib.SubSystemTib)
 449         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 450     else
 451         curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 452     tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
 453     tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
 454     tib->curdir.DosPath.Buffer = tib->curdir_buffer;
 455     tib->curdir.Handle = 0;
 456     memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
 457     tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
 458     RtlReleasePebLock();
 459     return tib;
 460 }
 461
 462 static inline void free_win16_tib( WIN16_SUBSYSTEM_TIB *tib )
 463 {
 464     if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
 465     HeapFree( GetProcessHeap(), 0, tib );
 466 }
 467
 468 /* startup routine for a new 16-bit thread */
 469 static DWORD CALLBACK task_start( LPVOID p )
 470 {
 471     struct create_data *data = p;
 472     TDB *pTask = data->task;
 473     DWORD ret;
 474
 475     kernel_get_thread_data()->htask16 = pTask->hSelf;
 476     NtCurrentTeb()->Tib.SubSystemTib = data->tib;
 477     HeapFree( GetProcessHeap(), 0, data );
 478
 479     _EnterWin16Lock();
 480     TASK_LinkTask( pTask->hSelf );
 481     pTask->teb = NtCurrentTeb();
 482     ret = NE_StartTask();
 483     _LeaveWin16Lock();
 484     return ret;
 485 }
 486
 487
 488 /***********************************************************************
 489  *           TASK_SpawnTask
 490  *
 491  * Spawn a new 16-bit task.
 492  */
 493 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 494                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 495 {
 496     struct create_data *data = NULL;
 497     WIN16_SUBSYSTEM_TIB *tib;
 498     TDB *pTask;
 499
 500     if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
 501     if (!(tib = allocate_win16_tib( pTask ))) goto failed;
 502     if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data)))) goto failed;
 503     data->task = pTask;
 504     data->tib = tib;
 505     if (!(*hThread = CreateThread( NULL, 0, task_start, data, 0, NULL ))) goto failed;
 506     return pTask->hSelf;
 507
 508 failed:
 509     if (tib) free_win16_tib( tib );
 510     HeapFree( GetProcessHeap(), 0, data );
 511     TASK_DeleteTask( pTask->hSelf );
 512     return 0;
 513 }
 514
 515
 516 /***********************************************************************
 517  *           TASK_GetTaskFromThread
 518  */
 519 HTASK16 TASK_GetTaskFromThread( DWORD thread )
 520 {
 521     TDB *p = TASK_GetPtr( hFirstTask );
 522     while (p)
 523     {
 524         if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
 525         p = TASK_GetPtr( p->hNext );
 526     }
 527     return 0;
 528 }
 529
 530
 531 /***********************************************************************
 532  *           TASK_CallTaskSignalProc
 533  */
 534 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
 535 {
 536     WORD args[5];
 537     TDB *pTask = TASK_GetCurrent();
 538
 539     if ( !pTask || !pTask->userhandler ) return;
 540
 541     args[4] = hTaskOrModule;
 542     args[3] = uCode;
 543     args[2] = 0;
 544     args[1] = pTask->hInstance;
 545     args[0] = pTask->hQueue;
 546     WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
 547 }
 548
 549
 550 /***********************************************************************
 551  *           TASK_ExitTask
 552  */
 553 void TASK_ExitTask(void)
 554 {
 555     WIN16_SUBSYSTEM_TIB *tib;
 556     TDB *pTask;
 557     DWORD lockCount;
 558
 559     /* Enter the Win16Lock to protect global data structures */
 560     _EnterWin16Lock();
 561
 562     pTask = TASK_GetCurrent();
 563     if ( !pTask )
 564     {
 565         _LeaveWin16Lock();
 566         return;
 567     }
 568
 569     TRACE("Killing task %04x\n", pTask->hSelf );
 570
 571     /* Perform USER cleanup */
 572
 573     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 574
 575     /* Remove the task from the list to be sure we never switch back to it */
 576     TASK_UnlinkTask( pTask->hSelf );
 577
 578     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 579     {
 580         TRACE("this is the last task, exiting\n" );
 581         ExitKernel16();
 582     }
 583
 584     pTask->nEvents = 0;
 585
 586     if ( hLockedTask == pTask->hSelf )
 587         hLockedTask = 0;
 588
 589     TASK_DeleteTask( pTask->hSelf );
 590
 591     if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
 592     {
 593         free_win16_tib( tib );
 594         NtCurrentTeb()->Tib.SubSystemTib = NULL;
 595     }
 596
 597     /* ... and completely release the Win16Lock, just in case. */
 598     ReleaseThunkLock( &lockCount );
 599 }
 600
 601
 602 /***********************************************************************
 603  *           ExitKernel (KERNEL.2)
 604  *
 605  * Clean-up everything and exit the Wine process.
 606  */
 607 void WINAPI ExitKernel16(void)
 608 {
 609     WriteOutProfiles16();
 610     TerminateProcess( GetCurrentProcess(), 0 );
 611 }
 612
 613
 614 /***********************************************************************
 615  *           InitTask  (KERNEL.91)
 616  *
 617  * Called by the application startup code.
 618  */
 619 void WINAPI InitTask16( CONTEXT86 *context )
 620 {
 621     TDB *pTask;
 622     INSTANCEDATA *pinstance;
 623     SEGPTR ptr;
 624
 625     context->Eax = 0;
 626     if (!(pTask = TASK_GetCurrent())) return;
 627
 628     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 629        as some apps, notably Visual Basic apps, *modify* the heap/stack
 630        size of the instance data segment before calling InitTask() */
 631
 632     /* Initialize the INSTANCEDATA structure */
 633     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 634     pinstance->stackmin    = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + sizeof( STACK16FRAME );
 635     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 636     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 637                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 638
 639     /* Initialize the local heap */
 640     if (LOWORD(context->Ecx))
 641         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 642
 643     /* Initialize implicitly loaded DLLs */
 644     NE_InitializeDLLs( pTask->hModule );
 645     NE_DllProcessAttach( pTask->hModule );
 646
 647     /* Registers on return are:
 648      * ax     1 if OK, 0 on error
 649      * cx     stack limit in bytes
 650      * dx     cmdShow parameter
 651      * si     instance handle of the previous instance
 652      * di     instance handle of the new task
 653      * es:bx  pointer to command line inside PSP
 654      *
 655      * 0 (=%bp) is pushed on the stack
 656      */
 657     ptr = stack16_push( sizeof(WORD) );
 658     *(WORD *)MapSL(ptr) = 0;
 659     context->Esp -= 2;
 660
 661     context->Eax = 1;
 662
 663     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 664     else
 665     {
 666         LPBYTE p = &pTask->pdb.cmdLine[1];
 667         while ((*p == ' ') || (*p == '\t')) p++;
 668         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 669     }
 670     context->Ecx   = pinstance->stacktop;
 671     context->Edx   = pTask->nCmdShow;
 672     context->Esi   = (DWORD)pTask->hPrevInstance;
 673     context->Edi   = (DWORD)pTask->hInstance;
 674     context->SegEs = (WORD)pTask->hPDB;
 675 }
 676
 677
 678 /***********************************************************************
 679  *           WaitEvent  (KERNEL.30)
 680  */
 681 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 682 {
 683     TDB *pTask;
 684
 685     if (!hTask) hTask = GetCurrentTask();
 686     pTask = TASK_GetPtr( hTask );
 687
 688     if (pTask->flags & TDBF_WIN32)
 689     {
 690         FIXME("called for Win32 thread (%04x)!\n", GetCurrentThreadId());
 691         return TRUE;
 692     }
 693
 694     if (pTask->nEvents > 0)
 695     {
 696         pTask->nEvents--;
 697         return FALSE;
 698     }
 699
 700     if (pTask->teb == NtCurrentTeb())
 701     {
 702         DWORD lockCount;
 703
 704         NtResetEvent( pTask->hEvent, NULL );
 705         ReleaseThunkLock( &lockCount );
 706         SYSLEVEL_CheckNotLevel( 1 );
 707         WaitForSingleObject( pTask->hEvent, INFINITE );
 708         RestoreThunkLock( lockCount );
 709         if (pTask->nEvents > 0) pTask->nEvents--;
 710     }
 711     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 712
 713     return TRUE;
 714 }
 715
 716
 717 /***********************************************************************
 718  *           PostEvent  (KERNEL.31)
 719  */
 720 void WINAPI PostEvent16( HTASK16 hTask )
 721 {
 722     TDB *pTask;
 723
 724     if (!hTask) hTask = GetCurrentTask();
 725     if (!(pTask = TASK_GetPtr( hTask ))) return;
 726
 727     if (pTask->flags & TDBF_WIN32)
 728     {
 729         FIXME("called for Win32 thread (%04x)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
 730         return;
 731     }
 732
 733     pTask->nEvents++;
 734
 735     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 736 }
 737
 738
 739 /***********************************************************************
 740  *           SetPriority  (KERNEL.32)
 741  */
 742 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 743 {
 744     TDB *pTask;
 745     INT16 newpriority;
 746
 747     if (!hTask) hTask = GetCurrentTask();
 748     if (!(pTask = TASK_GetPtr( hTask ))) return;
 749     newpriority = pTask->priority + delta;
 750     if (newpriority < -32) newpriority = -32;
 751     else if (newpriority > 15) newpriority = 15;
 752
 753     pTask->priority = newpriority + 1;
 754     TASK_UnlinkTask( pTask->hSelf );
 755     TASK_LinkTask( pTask->hSelf );
 756     pTask->priority--;
 757 }
 758
 759
 760 /***********************************************************************
 761  *           LockCurrentTask  (KERNEL.33)
 762  */
 763 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 764 {
 765     if (bLock) hLockedTask = GetCurrentTask();
 766     else hLockedTask = 0;
 767     return hLockedTask;
 768 }
 769
 770
 771 /***********************************************************************
 772  *           IsTaskLocked  (KERNEL.122)
 773  */
 774 HTASK16 WINAPI IsTaskLocked16(void)
 775 {
 776     return hLockedTask;
 777 }
 778
 779
 780 /***********************************************************************
 781  *           OldYield  (KERNEL.117)
 782  */
 783 void WINAPI OldYield16(void)
 784 {
 785    DWORD count;
 786
 787    ReleaseThunkLock(&count);
 788    RestoreThunkLock(count);
 789 }
 790
 791 /***********************************************************************
 792  *           WIN32_OldYield  (KERNEL.447)
 793  */
 794 void WINAPI WIN32_OldYield16(void)
 795 {
 796    DWORD count;
 797
 798    ReleaseThunkLock(&count);
 799    RestoreThunkLock(count);
 800 }
 801
 802 /***********************************************************************
 803  *           DirectedYield  (KERNEL.150)
 804  */
 805 void WINAPI DirectedYield16( HTASK16 hTask )
 806 {
 807     OldYield16();
 808 }
 809
 810 /***********************************************************************
 811  *           Yield  (KERNEL.29)
 812  */
 813 void WINAPI Yield16(void)
 814 {
 815     TDB *pCurTask = TASK_GetCurrent();
 816
 817     if (pCurTask && pCurTask->hQueue)
 818     {
 819         HMODULE mod = GetModuleHandleA( "user32.dll" );
 820         if (mod)
 821         {
 822             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 823             if (proc)
 824             {
 825                 proc();
 826                 return;
 827             }
 828         }
 829     }
 830     OldYield16();
 831 }
 832
 833 /***********************************************************************
 834  *           KERNEL_490  (KERNEL.490)
 835  */
 836 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 837 {
 838     if ( !someTask ) return 0;
 839
 840     FIXME("(%04x): stub\n", someTask );
 841     return 0;
 842 }
 843
 844 /***********************************************************************
 845  *           MakeProcInstance  (KERNEL.51)
 846  */
 847 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 848 {
 849     BYTE *thunk,*lfunc;
 850     SEGPTR thunkaddr;
 851     WORD hInstanceSelector;
 852
 853     hInstanceSelector = GlobalHandleToSel16(hInstance);
 854
 855     TRACE("(%p, %04x);\n", func, hInstance);
 856
 857     if (!HIWORD(func)) {
 858       /* Win95 actually protects via SEH, but this is better for debugging */
 859       WARN("Ouch ! Called with invalid func %p !\n", func);
 860       return (FARPROC16)0;
 861     }
 862
 863     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 864       && (hInstance != 0)
 865       && (hInstance != 0xffff) )
 866     {
 867         /* calling MPI with a foreign DSEG is invalid ! */
 868         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 869                    hInstance,CURRENT_DS);
 870     }
 871
 872     /* Always use the DSEG that MPI was entered with.
 873      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 874      * as CURRENT_DS provides the DSEG value we need.
 875      * ("calling" DS, *not* "task" DS !) */
 876     hInstanceSelector = CURRENT_DS;
 877     hInstance = GlobalHandle16(hInstanceSelector);
 878
 879     /* no thunking for DLLs */
 880     if (NE_GetPtr(FarGetOwner16(hInstance))->ne_flags & NE_FFLAGS_LIBMODULE)
 881         return func;
 882
 883     thunkaddr = TASK_AllocThunk();
 884     if (!thunkaddr) return (FARPROC16)0;
 885     thunk = MapSL( thunkaddr );
 886     lfunc = MapSL( (SEGPTR)func );
 887
 888     TRACE("(%p,%04x): got thunk %08x\n", func, hInstance, thunkaddr );
 889     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 890         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 891     ) {
 892         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 893     }
 894
 895     *thunk++ = 0xb8;    /* movw instance, %ax */
 896     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 897     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 898     *thunk++ = 0xea;    /* ljmp func */
 899     *(DWORD *)thunk = (DWORD)func;
 900     return (FARPROC16)thunkaddr;
 901     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 902 }
 903
 904
 905 /***********************************************************************
 906  *           FreeProcInstance  (KERNEL.52)
 907  */
 908 void WINAPI FreeProcInstance16( FARPROC16 func )
 909 {
 910     TRACE("(%p)\n", func );
 911     TASK_FreeThunk( (SEGPTR)func );
 912 }
 913
 914 /**********************************************************************
 915  *          TASK_GetCodeSegment
 916  *
 917  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 918  * and logical segment number of a given code segment.
 919  *
 920  * 'proc' either *is* already a pair of module handle and segment number,
 921  * in which case there's nothing to do.  Otherwise, it is a pointer to
 922  * a function, and we need to retrieve the code segment.  If the pointer
 923  * happens to point to a thunk, we'll retrieve info about the code segment
 924  * where the function pointed to by the thunk resides, not the thunk itself.
 925  *
 926  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 927  *        the function the snoop code will return to ...
 928  *
 929  */
 930 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 931                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 932 {
 933     NE_MODULE *pModule = NULL;
 934     SEGTABLEENTRY *pSeg = NULL;
 935     int segNr=0;
 936
 937     /* Try pair of module handle / segment number */
 938     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 939     if ( pModule && pModule->ne_magic == IMAGE_OS2_SIGNATURE )
 940     {
 941         segNr = LOWORD( proc );
 942         if ( segNr && segNr <= pModule->ne_cseg )
 943             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 944     }
 945
 946     /* Try thunk or function */
 947     else
 948     {
 949         BYTE *thunk = MapSL( (SEGPTR)proc );
 950         WORD selector;
 951
 952         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 953             selector = thunk[6] + (thunk[7] << 8);
 954         else
 955             selector = HIWORD( proc );
 956
 957         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 958         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 959
 960         if ( pModule )
 961             for ( segNr = 1; segNr <= pModule->ne_cseg; segNr++, pSeg++ )
 962                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 963                     break;
 964
 965         if ( pModule && segNr > pModule->ne_cseg )
 966             pSeg = NULL;
 967     }
 968
 969     /* Abort if segment not found */
 970
 971     if ( !pModule || !pSeg )
 972         return FALSE;
 973
 974     /* Return segment data */
 975
 976     if ( ppModule ) *ppModule = pModule;
 977     if ( ppSeg    ) *ppSeg    = pSeg;
 978     if ( pSegNr   ) *pSegNr   = segNr;
 979
 980     return TRUE;
 981 }
 982
 983 /**********************************************************************
 984  *          GetCodeHandle    (KERNEL.93)
 985  */
 986 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 987 {
 988     SEGTABLEENTRY *pSeg;
 989
 990     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 991         return (HANDLE16)0;
 992
 993     return pSeg->hSeg;
 994 }
 995
 996 /**********************************************************************
 997  *          GetCodeInfo    (KERNEL.104)
 998  */
 999 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
1000 {
1001     NE_MODULE *pModule;
1002     SEGTABLEENTRY *pSeg;
1003     int segNr;
1004
1005     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
1006         return FALSE;
1007
1008     /* Fill in segment information */
1009
1010     segInfo->offSegment = pSeg->filepos;
1011     segInfo->cbSegment  = pSeg->size;
1012     segInfo->flags      = pSeg->flags;
1013     segInfo->cbAlloc    = pSeg->minsize;
1014     segInfo->h          = pSeg->hSeg;
1015     segInfo->alignShift = pModule->ne_align;
1016
1017     if ( segNr == pModule->ne_autodata )
1018         segInfo->cbAlloc += pModule->ne_heap + pModule->ne_stack;
1019
1020     /* Return module handle in %es */
1021
1022     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1023
1024     return TRUE;
1025 }
1026
1027
1028 /**********************************************************************
1029  *          DefineHandleTable    (KERNEL.94)
1030  */
1031 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1032 {
1033     FIXME("(%04x): stub ?\n", wOffset);
1034     return TRUE;
1035 }
1036
1037
1038 /***********************************************************************
1039  *           SetTaskQueue  (KERNEL.34)
1040  */
1041 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1042 {
1043     FIXME( "stub, should not get called\n" );
1044     return 0xbeef;
1045 }
1046
1047
1048 /***********************************************************************
1049  *           GetTaskQueue  (KERNEL.35)
1050  */
1051 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1052 {
1053     FIXME( "stub, should not get called\n" );
1054     return 0xbeef;
1055 }
1056
1057 /***********************************************************************
1058  *           SetThreadQueue  (KERNEL.463)
1059  */
1060 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1061 {
1062     FIXME( "stub, should not get called\n" );
1063     return 0xbeef;
1064 }
1065
1066 /***********************************************************************
1067  *           GetThreadQueue  (KERNEL.464)
1068  */
1069 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1070 {
1071     FIXME( "stub, should not get called\n" );
1072     return 0xbeef;
1073 }
1074
1075 /***********************************************************************
1076  *           SetFastQueue  (KERNEL.624)
1077  */
1078 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1079 {
1080     FIXME( "stub, should not get called\n" );
1081 }
1082
1083 /***********************************************************************
1084  *           GetFastQueue  (KERNEL.625)
1085  */
1086 HQUEUE16 WINAPI GetFastQueue16( void )
1087 {
1088     FIXME( "stub, should not get called\n" );
1089     return 0xbeef;
1090 }
1091
1092 /***********************************************************************
1093  *           SwitchStackTo   (KERNEL.108)
1094  */
1095 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1096 {
1097     STACK16FRAME *oldFrame, *newFrame;
1098     INSTANCEDATA *pData;
1099     UINT16 copySize;
1100
1101     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1102     TRACE("old=%04x:%04x new=%04x:%04x\n",
1103           SELECTOROF( NtCurrentTeb()->WOW32Reserved ),
1104           OFFSETOF( NtCurrentTeb()->WOW32Reserved ), seg, ptr );
1105
1106     /* Save the old stack */
1107
1108     oldFrame = CURRENT_STACK16;
1109     /* pop frame + args and push bp */
1110     pData->old_ss_sp   = (SEGPTR)NtCurrentTeb()->WOW32Reserved + sizeof(STACK16FRAME)
1111                            + 2 * sizeof(WORD);
1112     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1113     pData->stacktop    = top;
1114     pData->stackmin    = ptr;
1115     pData->stackbottom = ptr;
1116
1117     /* Switch to the new stack */
1118
1119     /* Note: we need to take the 3 arguments into account; otherwise,
1120      * the stack will underflow upon return from this function.
1121      */
1122     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1123     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1124     NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR( seg, ptr - copySize );
1125     newFrame = CURRENT_STACK16;
1126
1127     /* Copy the stack frame and the local variables to the new stack */
1128
1129     memmove( newFrame, oldFrame, copySize );
1130     newFrame->bp = ptr;
1131     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1132 }
1133
1134
1135 /***********************************************************************
1136  *           SwitchStackBack   (KERNEL.109)
1137  */
1138 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1139 {
1140     STACK16FRAME *oldFrame, *newFrame;
1141     INSTANCEDATA *pData;
1142
1143     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->WOW32Reserved))))
1144         return;
1145     if (!pData->old_ss_sp)
1146     {
1147         WARN("No previous SwitchStackTo\n" );
1148         return;
1149     }
1150     TRACE("restoring stack %04x:%04x\n",
1151           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1152
1153     oldFrame = CURRENT_STACK16;
1154
1155     /* Pop bp from the previous stack */
1156
1157     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1158     pData->old_ss_sp += sizeof(WORD);
1159
1160     /* Switch back to the old stack */
1161
1162     NtCurrentTeb()->WOW32Reserved = (void *)(pData->old_ss_sp - sizeof(STACK16FRAME));
1163     context->SegSs = SELECTOROF(pData->old_ss_sp);
1164     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1165     pData->old_ss_sp = 0;
1166
1167     /* Build a stack frame for the return */
1168
1169     newFrame = CURRENT_STACK16;
1170     newFrame->frame32     = oldFrame->frame32;
1171     newFrame->module_cs   = oldFrame->module_cs;
1172     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1173     newFrame->entry_ip    = oldFrame->entry_ip;
1174 }
1175
1176
1177 /***********************************************************************
1178  *           GetTaskQueueDS  (KERNEL.118)
1179  */
1180 void WINAPI GetTaskQueueDS16(void)
1181 {
1182     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1183 }
1184
1185
1186 /***********************************************************************
1187  *           GetTaskQueueES  (KERNEL.119)
1188  */
1189 void WINAPI GetTaskQueueES16(void)
1190 {
1191     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1192 }
1193
1194
1195 /***********************************************************************
1196  *           GetCurrentTask   (KERNEL32.@)
1197  */
1198 HTASK16 WINAPI GetCurrentTask(void)
1199 {
1200     HTASK16 ret = kernel_get_thread_data()->htask16;
1201     if (!ret) ret = main_task;
1202     return ret;
1203 }
1204
1205 /***********************************************************************
1206  *           GetCurrentTask   (KERNEL.36)
1207  */
1208 DWORD WINAPI WIN16_GetCurrentTask(void)
1209 {
1210     /* This is the version used by relay code; the first task is */
1211     /* returned in the high word of the result */
1212     return MAKELONG( GetCurrentTask(), hFirstTask );
1213 }
1214
1215
1216 /***********************************************************************
1217  *           GetCurrentPDB   (KERNEL.37)
1218  *
1219  * UNDOC: returns PSP of KERNEL in high word
1220  */
1221 DWORD WINAPI GetCurrentPDB16(void)
1222 {
1223     TDB *pTask;
1224
1225     if (!(pTask = TASK_GetCurrent())) return 0;
1226     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1227 }
1228
1229
1230 /***********************************************************************
1231  *           GetCurPID   (KERNEL.157)
1232  */
1233 DWORD WINAPI GetCurPID16( DWORD unused )
1234 {
1235     return 0;
1236 }
1237
1238
1239 /***********************************************************************
1240  *           GetInstanceData   (KERNEL.54)
1241  */
1242 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1243 {
1244     char *ptr = (char *)GlobalLock16( instance );
1245     if (!ptr || !len) return 0;
1246     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1247     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1248     return len;
1249 }
1250
1251
1252 /***********************************************************************
1253  *           GetExeVersion   (KERNEL.105)
1254  */
1255 WORD WINAPI GetExeVersion16(void)
1256 {
1257     TDB *pTask;
1258
1259     if (!(pTask = TASK_GetCurrent())) return 0;
1260     return pTask->version;
1261 }
1262
1263
1264 /***********************************************************************
1265  *           SetErrorMode   (KERNEL.107)
1266  */
1267 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1268 {
1269     TDB *pTask;
1270     if (!(pTask = TASK_GetCurrent())) return 0;
1271     pTask->error_mode = mode;
1272     return SetErrorMode( mode );
1273 }
1274
1275
1276 /***********************************************************************
1277  *           GetNumTasks   (KERNEL.152)
1278  */
1279 UINT16 WINAPI GetNumTasks16(void)
1280 {
1281     return nTaskCount;
1282 }
1283
1284
1285 /***********************************************************************
1286  *           GetTaskDS   (KERNEL.155)
1287  *
1288  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1289  * I don't think we need to bother with this.
1290  */
1291 HINSTANCE16 WINAPI GetTaskDS16(void)
1292 {
1293     TDB *pTask;
1294
1295     if (!(pTask = TASK_GetCurrent())) return 0;
1296     return GlobalHandleToSel16(pTask->hInstance);
1297 }
1298
1299 /***********************************************************************
1300  *           GetDummyModuleHandleDS   (KERNEL.602)
1301  */
1302 WORD WINAPI GetDummyModuleHandleDS16(void)
1303 {
1304     TDB *pTask;
1305     WORD selector;
1306
1307     if (!(pTask = TASK_GetCurrent())) return 0;
1308     if (!(pTask->flags & TDBF_WIN32)) return 0;
1309     selector = GlobalHandleToSel16( pTask->hModule );
1310     CURRENT_DS = selector;
1311     return selector;
1312 }
1313
1314 /***********************************************************************
1315  *           IsTask   (KERNEL.320)
1316  */
1317 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1318 {
1319     TDB *pTask;
1320
1321     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1322     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1323     return (pTask->magic == TDB_MAGIC);
1324 }
1325
1326
1327 /***********************************************************************
1328  *           IsWinOldApTask   (KERNEL.158)
1329  */
1330 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1331 {
1332     /* should return bit 0 of byte 0x48 in PSP */
1333     return FALSE;
1334 }
1335
1336 /***********************************************************************
1337  *           SetTaskSignalProc   (KERNEL.38)
1338  */
1339 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1340 {
1341     TDB *pTask;
1342     FARPROC16 oldProc;
1343
1344     if (!hTask) hTask = GetCurrentTask();
1345     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1346     oldProc = pTask->userhandler;
1347     pTask->userhandler = proc;
1348     return oldProc;
1349 }
1350
1351 /***********************************************************************
1352  *           SetSigHandler   (KERNEL.140)
1353  */
1354 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1355                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1356 {
1357     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1358           newhandler,oldhandler,oldmode,newmode,flag );
1359
1360     if (flag != 1) return 0;
1361     if (!newmode) newhandler = NULL;  /* Default handler */
1362     if (newmode != 4)
1363     {
1364         TDB *pTask;
1365
1366         if (!(pTask = TASK_GetCurrent())) return 0;
1367         if (oldmode) *oldmode = pTask->signal_flags;
1368         pTask->signal_flags = newmode;
1369         if (oldhandler) *oldhandler = pTask->sighandler;
1370         pTask->sighandler = newhandler;
1371     }
1372     return 0;
1373 }
1374
1375
1376 /***********************************************************************
1377  *           GlobalNotify   (KERNEL.154)
1378  *
1379  * Note that GlobalNotify does _not_ return the old NotifyProc
1380  * -- contrary to LocalNotify !!
1381  */
1382 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1383 {
1384     TDB *pTask;
1385
1386     if (!(pTask = TASK_GetCurrent())) return;
1387     pTask->discardhandler = proc;
1388 }
1389
1390
1391 /***********************************************************************
1392  *           GetExePtrHelper
1393  */
1394 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1395 {
1396     char *ptr;
1397     HANDLE16 owner;
1398
1399       /* Check for module handle */
1400
1401     if (!(ptr = GlobalLock16( handle ))) return 0;
1402     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return handle;
1403
1404       /* Search for this handle inside all tasks */
1405
1406     *hTask = hFirstTask;
1407     while (*hTask)
1408     {
1409         TDB *pTask = TASK_GetPtr( *hTask );
1410         if ((*hTask == handle) ||
1411             (pTask->hInstance == handle) ||
1412             (pTask->hQueue == handle) ||
1413             (pTask->hPDB == handle)) return pTask->hModule;
1414         *hTask = pTask->hNext;
1415     }
1416
1417       /* Check the owner for module handle */
1418
1419     owner = FarGetOwner16( handle );
1420     if (!(ptr = GlobalLock16( owner ))) return 0;
1421     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return owner;
1422
1423       /* Search for the owner inside all tasks */
1424
1425     *hTask = hFirstTask;
1426     while (*hTask)
1427     {
1428         TDB *pTask = TASK_GetPtr( *hTask );
1429         if ((*hTask == owner) ||
1430             (pTask->hInstance == owner) ||
1431             (pTask->hQueue == owner) ||
1432             (pTask->hPDB == owner)) return pTask->hModule;
1433         *hTask = pTask->hNext;
1434     }
1435
1436     return 0;
1437 }
1438
1439 /***********************************************************************
1440  *           GetExePtr   (KERNEL.133)
1441  */
1442 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1443 {
1444     HTASK16 hTask = 0;
1445     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1446     STACK16FRAME *frame = CURRENT_STACK16;
1447     frame->ecx = hModule;
1448     if (hTask) frame->es = hTask;
1449     return hModule;
1450 }
1451
1452
1453 /***********************************************************************
1454  *           K228   (KERNEL.228)
1455  */
1456 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1457 {
1458     HTASK16 hTask = 0;
1459     return GetExePtrHelper( handle, &hTask );
1460 }
1461
1462
1463 /***********************************************************************
1464  *           TaskFirst   (TOOLHELP.63)
1465  */
1466 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1467 {
1468     lpte->hNext = hFirstTask;
1469     return TaskNext16( lpte );
1470 }
1471
1472
1473 /***********************************************************************
1474  *           TaskNext   (TOOLHELP.64)
1475  */
1476 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1477 {
1478     TDB *pTask;
1479     INSTANCEDATA *pInstData;
1480
1481     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1482     if (!lpte->hNext) return FALSE;
1483
1484     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1485     while (1) {
1486         pTask = TASK_GetPtr( lpte->hNext );
1487         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1488         if (pTask->hInstance)
1489             break;
1490         lpte->hNext = pTask->hNext;
1491     }
1492     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1493     lpte->hTask         = lpte->hNext;
1494     lpte->hTaskParent   = pTask->hParent;
1495     lpte->hInst         = pTask->hInstance;
1496     lpte->hModule       = pTask->hModule;
1497     lpte->wSS           = SELECTOROF( pTask->teb->WOW32Reserved );
1498     lpte->wSP           = OFFSETOF( pTask->teb->WOW32Reserved );
1499     lpte->wStackTop     = pInstData->stacktop;
1500     lpte->wStackMinimum = pInstData->stackmin;
1501     lpte->wStackBottom  = pInstData->stackbottom;
1502     lpte->wcEvents      = pTask->nEvents;
1503     lpte->hQueue        = pTask->hQueue;
1504     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1505     lpte->wPSPOffset    = 0x100;  /*??*/
1506     lpte->hNext         = pTask->hNext;
1507     return TRUE;
1508 }
1509
1510
1511 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1512
1513 /**************************************************************************
1514  *           FatalAppExit   (KERNEL.137)
1515  */
1516 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1517 {
1518     TDB *pTask = TASK_GetCurrent();
1519
1520     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1521     {
1522         HMODULE mod = GetModuleHandleA( "user32.dll" );
1523         if (mod)
1524         {
1525             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1526             if (pMessageBoxA)
1527             {
1528                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1529                 goto done;
1530             }
1531         }
1532         ERR( "%s\n", debugstr_a(str) );
1533     }
1534  done:
1535     ExitThread(0xff);
1536 }
1537
1538
1539 /***********************************************************************
1540  *           TerminateApp   (TOOLHELP.77)
1541  *
1542  * See "Undocumented Windows".
1543  */
1544 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1545 {
1546     if (hTask && hTask != GetCurrentTask())
1547     {
1548         FIXME("cannot terminate task %x\n", hTask);
1549         return;
1550     }
1551
1552     if (wFlags & NO_UAE_BOX)
1553     {
1554         UINT16 old_mode;
1555         old_mode = SetErrorMode16(0);
1556         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1557     }
1558     FatalAppExit16( 0, NULL );
1559
1560     /* hmm, we're still alive ?? */
1561
1562     /* check undocumented flag */
1563     if (!(wFlags & 0x8000))
1564         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1565
1566     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1567        but let's just call ExitThread */
1568     ExitThread(0xff);
1569 }
1570
1571
1572 /***********************************************************************
1573  *           GetAppCompatFlags   (KERNEL.354)
1574  */
1575 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1576 {
1577     TDB *pTask;
1578
1579     if (!hTask) hTask = GetCurrentTask();
1580     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1581     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1582     return pTask->compat_flags;
1583 }
1584
1585
1586 /***********************************************************************
1587  *           GetDOSEnvironment     (KERNEL.131)
1588  *
1589  * Note: the environment is allocated once, it doesn't track changes
1590  * made using the Win32 API. This shouldn't matter.
1591  *
1592  * Format of a 16-bit environment block:
1593  * ASCIIZ   string 1 (xx=yy format)
1594  * ...
1595  * ASCIIZ   string n
1596  * BYTE     0
1597  * WORD     1
1598  * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1599  */
1600 SEGPTR WINAPI GetDOSEnvironment16(void)
1601 {
1602     static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1603     static HGLOBAL16 handle;  /* handle to the 16 bit environment */
1604
1605     if (!handle)
1606     {
1607         DWORD size;
1608         LPSTR p, env;
1609
1610         p = env = GetEnvironmentStringsA();
1611         while (*p) p += strlen(p) + 1;
1612         p++;  /* skip last null */
1613         size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1614         handle = GlobalAlloc16( GMEM_FIXED, size );
1615         if (handle)
1616         {
1617             WORD one = 1;
1618             LPSTR env16 = GlobalLock16( handle );
1619             memcpy( env16, env, p - env );
1620             memcpy( env16 + (p - env), &one, sizeof(one));
1621             memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1622             GlobalUnlock16( handle );
1623         }
1624         FreeEnvironmentStringsA( env );
1625     }
1626     return WOWGlobalLock16( handle );
1627 }