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