dlls/kernel/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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 "module.h"
  41 #include "winternl.h"
  42 #include "wine/server.h"
  43 #include "stackframe.h"
  44 #include "thread.h"
  45 #include "toolhelp.h"
  46 #include "kernel_private.h"
  47
  48 #include "wine/debug.h"
  49
  50 WINE_DEFAULT_DEBUG_CHANNEL(task);
  51 WINE_DECLARE_DEBUG_CHANNEL(relay);
  52 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
  53
  54 #include "pshpack1.h"
  55
  56 /* Segment containing MakeProcInstance() thunks */
  57 typedef struct
  58 {
  59     WORD  next;       /* Selector of next segment */
  60     WORD  magic;      /* Thunks signature */
  61     WORD  unused;
  62     WORD  free;       /* Head of the free list */
  63     WORD  thunks[4];  /* Each thunk is 4 words long */
  64 } THUNKS;
  65
  66 #include "poppack.h"
  67
  68 #define THUNK_MAGIC  ('P' | ('T' << 8))
  69
  70   /* Min. number of thunks allocated when creating a new segment */
  71 #define MIN_THUNKS  32
  72
  73 #define TDB_MAGIC    ('T' | ('D' << 8))
  74
  75 static THHOOK DefaultThhook;
  76 THHOOK *pThhook = &DefaultThhook;
  77
  78 #define hFirstTask   (pThhook->HeadTDB)
  79 #define hLockedTask  (pThhook->LockTDB)
  80
  81 static UINT16 nTaskCount = 0;
  82
  83 static HTASK16 initial_task;
  84
  85 /***********************************************************************
  86  *           TASK_InstallTHHook
  87  */
  88 void TASK_InstallTHHook( THHOOK *pNewThhook )
  89 {
  90      THHOOK *pOldThhook = pThhook;
  91
  92      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  93
  94      *pThhook = *pOldThhook;
  95 }
  96
  97 /***********************************************************************
  98  *           TASK_GetPtr
  99  */
 100 static TDB *TASK_GetPtr( HTASK16 hTask )
 101 {
 102     return GlobalLock16( hTask );
 103 }
 104
 105
 106 /***********************************************************************
 107  *           TASK_GetCurrent
 108  */
 109 TDB *TASK_GetCurrent(void)
 110 {
 111     return TASK_GetPtr( GetCurrentTask() );
 112 }
 113
 114
 115 /***********************************************************************
 116  *           TASK_LinkTask
 117  */
 118 static void TASK_LinkTask( HTASK16 hTask )
 119 {
 120     HTASK16 *prevTask;
 121     TDB *pTask;
 122
 123     if (!(pTask = TASK_GetPtr( hTask ))) return;
 124     prevTask = &hFirstTask;
 125     while (*prevTask)
 126     {
 127         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 128         if (prevTaskPtr->priority >= pTask->priority) break;
 129         prevTask = &prevTaskPtr->hNext;
 130     }
 131     pTask->hNext = *prevTask;
 132     *prevTask = hTask;
 133     nTaskCount++;
 134 }
 135
 136
 137 /***********************************************************************
 138  *           TASK_UnlinkTask
 139  */
 140 static void TASK_UnlinkTask( HTASK16 hTask )
 141 {
 142     HTASK16 *prevTask;
 143     TDB *pTask;
 144
 145     prevTask = &hFirstTask;
 146     while (*prevTask && (*prevTask != hTask))
 147     {
 148         pTask = TASK_GetPtr( *prevTask );
 149         prevTask = &pTask->hNext;
 150     }
 151     if (*prevTask)
 152     {
 153         pTask = TASK_GetPtr( *prevTask );
 154         *prevTask = pTask->hNext;
 155         pTask->hNext = 0;
 156         nTaskCount--;
 157     }
 158 }
 159
 160
 161 /***********************************************************************
 162  *           TASK_CreateThunks
 163  *
 164  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 165  * and containing 'count' entries.
 166  */
 167 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 168 {
 169     int i;
 170     WORD free;
 171     THUNKS *pThunk;
 172
 173     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 174     pThunk->next = 0;
 175     pThunk->magic = THUNK_MAGIC;
 176     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 177     free = pThunk->free;
 178     for (i = 0; i < count-1; i++)
 179     {
 180         free += 8;  /* Offset of next thunk */
 181         pThunk->thunks[4*i] = free;
 182     }
 183     pThunk->thunks[4*i] = 0;  /* Last thunk */
 184 }
 185
 186
 187 /***********************************************************************
 188  *           TASK_AllocThunk
 189  *
 190  * Allocate a thunk for MakeProcInstance().
 191  */
 192 static SEGPTR TASK_AllocThunk(void)
 193 {
 194     TDB *pTask;
 195     THUNKS *pThunk;
 196     WORD sel, base;
 197
 198     if (!(pTask = TASK_GetCurrent())) return 0;
 199     sel = pTask->hCSAlias;
 200     pThunk = (THUNKS *)&pTask->thunks;
 201     base = (char *)pThunk - (char *)pTask;
 202     while (!pThunk->free)
 203     {
 204         sel = pThunk->next;
 205         if (!sel)  /* Allocate a new segment */
 206         {
 207             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 208                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 209             if (!sel) return (SEGPTR)0;
 210             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 211             pThunk->next = sel;
 212         }
 213         pThunk = (THUNKS *)GlobalLock16( sel );
 214         base = 0;
 215     }
 216     base += pThunk->free;
 217     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 218     return MAKESEGPTR( sel, base );
 219 }
 220
 221
 222 /***********************************************************************
 223  *           TASK_FreeThunk
 224  *
 225  * Free a MakeProcInstance() thunk.
 226  */
 227 static BOOL TASK_FreeThunk( SEGPTR thunk )
 228 {
 229     TDB *pTask;
 230     THUNKS *pThunk;
 231     WORD sel, base;
 232
 233     if (!(pTask = TASK_GetCurrent())) return 0;
 234     sel = pTask->hCSAlias;
 235     pThunk = (THUNKS *)&pTask->thunks;
 236     base = (char *)pThunk - (char *)pTask;
 237     while (sel && (sel != HIWORD(thunk)))
 238     {
 239         sel = pThunk->next;
 240         pThunk = (THUNKS *)GlobalLock16( sel );
 241         base = 0;
 242     }
 243     if (!sel) return FALSE;
 244     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 245     pThunk->free = LOWORD(thunk) - base;
 246     return TRUE;
 247 }
 248
 249
 250 /***********************************************************************
 251  *           TASK_Create
 252  *
 253  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 254  *       to be careful to protect global data structures. We do this
 255  *       by entering the Win16Lock while linking the task into the
 256  *       global task list.
 257  */
 258 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
 259 {
 260     HTASK16 hTask;
 261     TDB *pTask;
 262     FARPROC16 proc;
 263     char curdir[MAX_PATH];
 264     HMODULE16 hModule = pModule ? pModule->self : 0;
 265
 266       /* Allocate the task structure */
 267
 268     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 269     if (!hTask) return NULL;
 270     pTask = TASK_GetPtr( hTask );
 271     FarSetOwner16( hTask, hModule );
 272
 273     /* Fill the task structure */
 274
 275     pTask->hSelf = hTask;
 276
 277     pTask->version       = pModule ? pModule->expected_version : 0x0400;
 278     pTask->hModule       = hModule;
 279     pTask->hParent       = GetCurrentTask();
 280     pTask->magic         = TDB_MAGIC;
 281     pTask->nCmdShow      = cmdShow;
 282
 283     GetCurrentDirectoryA( sizeof(curdir), curdir );
 284     GetShortPathNameA( curdir, curdir, sizeof(curdir) );
 285     pTask->curdrive = (curdir[0] - 'A') | 0x80;
 286     lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
 287
 288       /* Create the thunks block */
 289
 290     TASK_CreateThunks( hTask, (char *)&pTask->thunks - (char *)pTask, 7 );
 291
 292       /* Copy the module name */
 293
 294     if (hModule)
 295     {
 296         char name[10];
 297         GetModuleName16( hModule, name, sizeof(name) );
 298         strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 299         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 300     }
 301
 302       /* Allocate a selector for the PDB */
 303
 304     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 305                                       hModule, WINE_LDT_FLAGS_DATA );
 306
 307       /* Fill the PDB */
 308
 309     pTask->pdb.int20 = 0x20cd;
 310     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 311     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 312     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 313     pTask->pdb.savedint22 = 0;
 314     pTask->pdb.savedint23 = 0;
 315     pTask->pdb.savedint24 = 0;
 316     pTask->pdb.fileHandlesPtr =
 317         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 318     pTask->pdb.hFileHandles = 0;
 319     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 320     /* FIXME: should we make a copy of the environment? */
 321     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 322     pTask->pdb.nbFiles        = 20;
 323
 324     /* Fill the command line */
 325
 326     if (!cmdline)
 327     {
 328         cmdline = GetCommandLineA();
 329         /* remove the first word (program name) */
 330         if (*cmdline == '"')
 331             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 332         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 333         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 334         len = strlen(cmdline);
 335     }
 336     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 337     pTask->pdb.cmdLine[0] = len;
 338     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 339     /* pTask->pdb.cmdLine[len+1] = 0; */
 340
 341     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 342
 343       /* Allocate a code segment alias for the TDB */
 344
 345     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 346                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 347
 348       /* Default DTA overwrites command line */
 349
 350     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 351
 352     /* Create scheduler event for 16-bit tasks */
 353
 354     if ( !(pTask->flags & TDBF_WIN32) )
 355         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 356
 357     if (!initial_task) initial_task = hTask;
 358
 359     return pTask;
 360 }
 361
 362
 363 /***********************************************************************
 364  *           TASK_DeleteTask
 365  */
 366 static void TASK_DeleteTask( HTASK16 hTask )
 367 {
 368     TDB *pTask;
 369     HGLOBAL16 hPDB;
 370
 371     if (!(pTask = TASK_GetPtr( hTask ))) return;
 372     hPDB = pTask->hPDB;
 373
 374     pTask->magic = 0xdead; /* invalidate signature */
 375
 376     /* Free the selector aliases */
 377
 378     GLOBAL_FreeBlock( pTask->hCSAlias );
 379     GLOBAL_FreeBlock( pTask->hPDB );
 380
 381     /* Free the task module */
 382
 383     FreeModule16( pTask->hModule );
 384
 385     /* Free the task structure itself */
 386
 387     GlobalFree16( hTask );
 388
 389     /* Free all memory used by this task (including the 32-bit stack, */
 390     /* the environment block and the thunk segments). */
 391
 392     GlobalFreeAll16( hPDB );
 393 }
 394
 395
 396 /***********************************************************************
 397  *           TASK_CreateMainTask
 398  *
 399  * Create a task for the main (32-bit) process.
 400  */
 401 void TASK_CreateMainTask(void)
 402 {
 403     TDB *pTask;
 404     STARTUPINFOA startup_info;
 405     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 406
 407     GetStartupInfoA( &startup_info );
 408     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 409     pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
 410     if (!pTask)
 411     {
 412         ERR("could not create task for main process\n");
 413         ExitProcess(1);
 414     }
 415
 416     pTask->flags        |= TDBF_WIN32;
 417     pTask->hInstance     = 0;
 418     pTask->hPrevInstance = 0;
 419     pTask->teb           = NtCurrentTeb();
 420
 421     NtCurrentTeb()->htask16 = pTask->hSelf;
 422
 423     /* Add the task to the linked list */
 424     /* (no need to get the win16 lock, we are the only thread at this point) */
 425     TASK_LinkTask( pTask->hSelf );
 426 }
 427
 428
 429 /* allocate the win16 TIB for a new 16-bit task */
 430 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
 431 {
 432     WCHAR path[MAX_PATH];
 433     WIN16_SUBSYSTEM_TIB *tib;
 434     UNICODE_STRING *curdir;
 435     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 436
 437     if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
 438     MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 439     GetLongPathNameW( path, path, MAX_PATH );
 440     if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
 441     else tib->exe_name = NULL;
 442
 443     RtlAcquirePebLock();
 444     curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 445     tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
 446     tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
 447     tib->curdir.DosPath.Buffer = tib->curdir_buffer;
 448     tib->curdir.Handle = 0;
 449     memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
 450     tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
 451     RtlReleasePebLock();
 452     return tib;
 453 }
 454
 455 /* startup routine for a new 16-bit thread */
 456 static DWORD CALLBACK task_start( TDB *pTask )
 457 {
 458     DWORD ret;
 459
 460     NtCurrentTeb()->htask16 = pTask->hSelf;
 461     NtCurrentTeb()->Tib.SubSystemTib = allocate_win16_tib( pTask );
 462
 463     _EnterWin16Lock();
 464     TASK_LinkTask( pTask->hSelf );
 465     pTask->teb = NtCurrentTeb();
 466     ret = NE_StartTask();
 467     _LeaveWin16Lock();
 468     return ret;
 469 }
 470
 471
 472 /***********************************************************************
 473  *           TASK_SpawnTask
 474  *
 475  * Spawn a new 16-bit task.
 476  */
 477 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 478                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 479 {
 480     TDB *pTask;
 481
 482     if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
 483     if (!(*hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)task_start, pTask, 0, NULL )))
 484     {
 485         TASK_DeleteTask( pTask->hSelf );
 486         return 0;
 487     }
 488     return pTask->hSelf;
 489 }
 490
 491
 492 /***********************************************************************
 493  *           TASK_GetTaskFromThread
 494  */
 495 HTASK16 TASK_GetTaskFromThread( DWORD thread )
 496 {
 497     TDB *p = TASK_GetPtr( hFirstTask );
 498     while (p)
 499     {
 500         if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
 501         p = TASK_GetPtr( p->hNext );
 502     }
 503     return 0;
 504 }
 505
 506
 507 /***********************************************************************
 508  *           TASK_CallTaskSignalProc
 509  */
 510 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
 511 {
 512     WORD args[5];
 513     TDB *pTask = TASK_GetCurrent();
 514
 515     if ( !pTask || !pTask->userhandler ) return;
 516
 517     args[4] = hTaskOrModule;
 518     args[3] = uCode;
 519     args[2] = 0;
 520     args[1] = pTask->hInstance;
 521     args[0] = pTask->hQueue;
 522     WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
 523 }
 524
 525
 526 /***********************************************************************
 527  *           TASK_ExitTask
 528  */
 529 void TASK_ExitTask(void)
 530 {
 531     WIN16_SUBSYSTEM_TIB *tib;
 532     TDB *pTask;
 533     DWORD lockCount;
 534
 535     /* Enter the Win16Lock to protect global data structures */
 536     _EnterWin16Lock();
 537
 538     pTask = TASK_GetCurrent();
 539     if ( !pTask )
 540     {
 541         _LeaveWin16Lock();
 542         return;
 543     }
 544
 545     TRACE("Killing task %04x\n", pTask->hSelf );
 546
 547     /* Perform USER cleanup */
 548
 549     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 550
 551     /* Remove the task from the list to be sure we never switch back to it */
 552     TASK_UnlinkTask( pTask->hSelf );
 553
 554     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 555     {
 556         TRACE("this is the last task, exiting\n" );
 557         ExitKernel16();
 558     }
 559
 560     pTask->nEvents = 0;
 561
 562     if ( hLockedTask == pTask->hSelf )
 563         hLockedTask = 0;
 564
 565     TASK_DeleteTask( pTask->hSelf );
 566
 567     if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
 568     {
 569         if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
 570         HeapFree( GetProcessHeap(), 0, tib );
 571         NtCurrentTeb()->Tib.SubSystemTib = NULL;
 572     }
 573
 574     /* ... and completely release the Win16Lock, just in case. */
 575     ReleaseThunkLock( &lockCount );
 576 }
 577
 578
 579 /***********************************************************************
 580  *           ExitKernel (KERNEL.2)
 581  *
 582  * Clean-up everything and exit the Wine process.
 583  */
 584 void WINAPI ExitKernel16(void)
 585 {
 586     WriteOutProfiles16();
 587     TerminateProcess( GetCurrentProcess(), 0 );
 588 }
 589
 590
 591 /***********************************************************************
 592  *           InitTask  (KERNEL.91)
 593  *
 594  * Called by the application startup code.
 595  */
 596 void WINAPI InitTask16( CONTEXT86 *context )
 597 {
 598     TDB *pTask;
 599     INSTANCEDATA *pinstance;
 600     SEGPTR ptr;
 601
 602     context->Eax = 0;
 603     if (!(pTask = TASK_GetCurrent())) return;
 604
 605     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 606        as some apps, notably Visual Basic apps, *modify* the heap/stack
 607        size of the instance data segment before calling InitTask() */
 608
 609     /* Initialize the INSTANCEDATA structure */
 610     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 611     pinstance->stackmin    = OFFSETOF( NtCurrentTeb()->cur_stack ) + sizeof( STACK16FRAME );
 612     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 613     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 614                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 615
 616     /* Initialize the local heap */
 617     if (LOWORD(context->Ecx))
 618         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 619
 620     /* Initialize implicitly loaded DLLs */
 621     NE_InitializeDLLs( pTask->hModule );
 622     NE_DllProcessAttach( pTask->hModule );
 623
 624     /* Registers on return are:
 625      * ax     1 if OK, 0 on error
 626      * cx     stack limit in bytes
 627      * dx     cmdShow parameter
 628      * si     instance handle of the previous instance
 629      * di     instance handle of the new task
 630      * es:bx  pointer to command line inside PSP
 631      *
 632      * 0 (=%bp) is pushed on the stack
 633      */
 634     ptr = stack16_push( sizeof(WORD) );
 635     *(WORD *)MapSL(ptr) = 0;
 636     context->Esp -= 2;
 637
 638     context->Eax = 1;
 639
 640     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 641     else
 642     {
 643         LPBYTE p = &pTask->pdb.cmdLine[1];
 644         while ((*p == ' ') || (*p == '\t')) p++;
 645         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 646     }
 647     context->Ecx   = pinstance->stacktop;
 648     context->Edx   = pTask->nCmdShow;
 649     context->Esi   = (DWORD)pTask->hPrevInstance;
 650     context->Edi   = (DWORD)pTask->hInstance;
 651     context->SegEs = (WORD)pTask->hPDB;
 652 }
 653
 654
 655 /***********************************************************************
 656  *           WaitEvent  (KERNEL.30)
 657  */
 658 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 659 {
 660     TDB *pTask;
 661
 662     if (!hTask) hTask = GetCurrentTask();
 663     pTask = TASK_GetPtr( hTask );
 664
 665     if (pTask->flags & TDBF_WIN32)
 666     {
 667         FIXME("called for Win32 thread (%04lx)!\n", GetCurrentThreadId());
 668         return TRUE;
 669     }
 670
 671     if (pTask->nEvents > 0)
 672     {
 673         pTask->nEvents--;
 674         return FALSE;
 675     }
 676
 677     if (pTask->teb == NtCurrentTeb())
 678     {
 679         DWORD lockCount;
 680
 681         NtResetEvent( pTask->hEvent, NULL );
 682         ReleaseThunkLock( &lockCount );
 683         SYSLEVEL_CheckNotLevel( 1 );
 684         WaitForSingleObject( pTask->hEvent, INFINITE );
 685         RestoreThunkLock( lockCount );
 686         if (pTask->nEvents > 0) pTask->nEvents--;
 687     }
 688     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 689
 690     return TRUE;
 691 }
 692
 693
 694 /***********************************************************************
 695  *           PostEvent  (KERNEL.31)
 696  */
 697 void WINAPI PostEvent16( HTASK16 hTask )
 698 {
 699     TDB *pTask;
 700
 701     if (!hTask) hTask = GetCurrentTask();
 702     if (!(pTask = TASK_GetPtr( hTask ))) return;
 703
 704     if (pTask->flags & TDBF_WIN32)
 705     {
 706         FIXME("called for Win32 thread (%04lx)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
 707         return;
 708     }
 709
 710     pTask->nEvents++;
 711
 712     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 713 }
 714
 715
 716 /***********************************************************************
 717  *           SetPriority  (KERNEL.32)
 718  */
 719 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 720 {
 721     TDB *pTask;
 722     INT16 newpriority;
 723
 724     if (!hTask) hTask = GetCurrentTask();
 725     if (!(pTask = TASK_GetPtr( hTask ))) return;
 726     newpriority = pTask->priority + delta;
 727     if (newpriority < -32) newpriority = -32;
 728     else if (newpriority > 15) newpriority = 15;
 729
 730     pTask->priority = newpriority + 1;
 731     TASK_UnlinkTask( pTask->hSelf );
 732     TASK_LinkTask( pTask->hSelf );
 733     pTask->priority--;
 734 }
 735
 736
 737 /***********************************************************************
 738  *           LockCurrentTask  (KERNEL.33)
 739  */
 740 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 741 {
 742     if (bLock) hLockedTask = GetCurrentTask();
 743     else hLockedTask = 0;
 744     return hLockedTask;
 745 }
 746
 747
 748 /***********************************************************************
 749  *           IsTaskLocked  (KERNEL.122)
 750  */
 751 HTASK16 WINAPI IsTaskLocked16(void)
 752 {
 753     return hLockedTask;
 754 }
 755
 756
 757 /***********************************************************************
 758  *           OldYield  (KERNEL.117)
 759  */
 760 void WINAPI OldYield16(void)
 761 {
 762    DWORD count;
 763
 764    ReleaseThunkLock(&count);
 765    RestoreThunkLock(count);
 766 }
 767
 768 /***********************************************************************
 769  *           WIN32_OldYield  (KERNEL.447)
 770  */
 771 void WINAPI WIN32_OldYield16(void)
 772 {
 773    DWORD count;
 774
 775    ReleaseThunkLock(&count);
 776    RestoreThunkLock(count);
 777 }
 778
 779 /***********************************************************************
 780  *           DirectedYield  (KERNEL.150)
 781  */
 782 void WINAPI DirectedYield16( HTASK16 hTask )
 783 {
 784     OldYield16();
 785 }
 786
 787 /***********************************************************************
 788  *           Yield  (KERNEL.29)
 789  */
 790 void WINAPI Yield16(void)
 791 {
 792     TDB *pCurTask = TASK_GetCurrent();
 793
 794     if (pCurTask && pCurTask->hQueue)
 795     {
 796         HMODULE mod = GetModuleHandleA( "user32.dll" );
 797         if (mod)
 798         {
 799             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 800             if (proc)
 801             {
 802                 proc();
 803                 return;
 804             }
 805         }
 806     }
 807     OldYield16();
 808 }
 809
 810 /***********************************************************************
 811  *           KERNEL_490  (KERNEL.490)
 812  */
 813 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 814 {
 815     if ( !someTask ) return 0;
 816
 817     FIXME("(%04x): stub\n", someTask );
 818     return 0;
 819 }
 820
 821 /***********************************************************************
 822  *           MakeProcInstance  (KERNEL.51)
 823  */
 824 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 825 {
 826     BYTE *thunk,*lfunc;
 827     SEGPTR thunkaddr;
 828     WORD hInstanceSelector;
 829
 830     hInstanceSelector = GlobalHandleToSel16(hInstance);
 831
 832     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 833
 834     if (!HIWORD(func)) {
 835       /* Win95 actually protects via SEH, but this is better for debugging */
 836       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 837       return (FARPROC16)0;
 838     }
 839
 840     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 841       && (hInstance != 0)
 842       && (hInstance != 0xffff) )
 843     {
 844         /* calling MPI with a foreign DSEG is invalid ! */
 845         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 846                    hInstance,CURRENT_DS);
 847     }
 848
 849     /* Always use the DSEG that MPI was entered with.
 850      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 851      * as CURRENT_DS provides the DSEG value we need.
 852      * ("calling" DS, *not* "task" DS !) */
 853     hInstanceSelector = CURRENT_DS;
 854     hInstance = GlobalHandle16(hInstanceSelector);
 855
 856     /* no thunking for DLLs */
 857     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 858         return func;
 859
 860     thunkaddr = TASK_AllocThunk();
 861     if (!thunkaddr) return (FARPROC16)0;
 862     thunk = MapSL( thunkaddr );
 863     lfunc = MapSL( (SEGPTR)func );
 864
 865     TRACE("(%08lx,%04x): got thunk %08lx\n",
 866           (DWORD)func, hInstance, (DWORD)thunkaddr );
 867     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 868         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 869     ) {
 870         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 871     }
 872
 873     *thunk++ = 0xb8;    /* movw instance, %ax */
 874     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 875     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 876     *thunk++ = 0xea;    /* ljmp func */
 877     *(DWORD *)thunk = (DWORD)func;
 878     return (FARPROC16)thunkaddr;
 879     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 880 }
 881
 882
 883 /***********************************************************************
 884  *           FreeProcInstance  (KERNEL.52)
 885  */
 886 void WINAPI FreeProcInstance16( FARPROC16 func )
 887 {
 888     TRACE("(%08lx)\n", (DWORD)func );
 889     TASK_FreeThunk( (SEGPTR)func );
 890 }
 891
 892 /**********************************************************************
 893  *          TASK_GetCodeSegment
 894  *
 895  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 896  * and logical segment number of a given code segment.
 897  *
 898  * 'proc' either *is* already a pair of module handle and segment number,
 899  * in which case there's nothing to do.  Otherwise, it is a pointer to
 900  * a function, and we need to retrieve the code segment.  If the pointer
 901  * happens to point to a thunk, we'll retrieve info about the code segment
 902  * where the function pointed to by the thunk resides, not the thunk itself.
 903  *
 904  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 905  *        the function the snoop code will return to ...
 906  *
 907  */
 908 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 909                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 910 {
 911     NE_MODULE *pModule = NULL;
 912     SEGTABLEENTRY *pSeg = NULL;
 913     int segNr=0;
 914
 915     /* Try pair of module handle / segment number */
 916     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 917     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 918     {
 919         segNr = LOWORD( proc );
 920         if ( segNr && segNr <= pModule->seg_count )
 921             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 922     }
 923
 924     /* Try thunk or function */
 925     else
 926     {
 927         BYTE *thunk = MapSL( (SEGPTR)proc );
 928         WORD selector;
 929
 930         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 931             selector = thunk[6] + (thunk[7] << 8);
 932         else
 933             selector = HIWORD( proc );
 934
 935         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 936         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 937
 938         if ( pModule )
 939             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 940                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 941                     break;
 942
 943         if ( pModule && segNr > pModule->seg_count )
 944             pSeg = NULL;
 945     }
 946
 947     /* Abort if segment not found */
 948
 949     if ( !pModule || !pSeg )
 950         return FALSE;
 951
 952     /* Return segment data */
 953
 954     if ( ppModule ) *ppModule = pModule;
 955     if ( ppSeg    ) *ppSeg    = pSeg;
 956     if ( pSegNr   ) *pSegNr   = segNr;
 957
 958     return TRUE;
 959 }
 960
 961 /**********************************************************************
 962  *          GetCodeHandle    (KERNEL.93)
 963  */
 964 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 965 {
 966     SEGTABLEENTRY *pSeg;
 967
 968     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 969         return (HANDLE16)0;
 970
 971     return pSeg->hSeg;
 972 }
 973
 974 /**********************************************************************
 975  *          GetCodeInfo    (KERNEL.104)
 976  */
 977 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 978 {
 979     NE_MODULE *pModule;
 980     SEGTABLEENTRY *pSeg;
 981     int segNr;
 982
 983     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 984         return FALSE;
 985
 986     /* Fill in segment information */
 987
 988     segInfo->offSegment = pSeg->filepos;
 989     segInfo->cbSegment  = pSeg->size;
 990     segInfo->flags      = pSeg->flags;
 991     segInfo->cbAlloc    = pSeg->minsize;
 992     segInfo->h          = pSeg->hSeg;
 993     segInfo->alignShift = pModule->alignment;
 994
 995     if ( segNr == pModule->dgroup )
 996         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 997
 998     /* Return module handle in %es */
 999
1000     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1001
1002     return TRUE;
1003 }
1004
1005
1006 /**********************************************************************
1007  *          DefineHandleTable    (KERNEL.94)
1008  */
1009 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1010 {
1011     FIXME("(%04x): stub ?\n", wOffset);
1012     return TRUE;
1013 }
1014
1015
1016 /***********************************************************************
1017  *           SetTaskQueue  (KERNEL.34)
1018  */
1019 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1020 {
1021     HQUEUE16 hPrev;
1022     TDB *pTask;
1023
1024     if (!hTask) hTask = GetCurrentTask();
1025     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1026
1027     hPrev = pTask->hQueue;
1028     pTask->hQueue = hQueue;
1029
1030     return hPrev;
1031 }
1032
1033
1034 /***********************************************************************
1035  *           GetTaskQueue  (KERNEL.35)
1036  */
1037 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1038 {
1039     TDB *pTask;
1040
1041     if (!hTask) hTask = GetCurrentTask();
1042     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1043     return pTask->hQueue;
1044 }
1045
1046 /***********************************************************************
1047  *           SetThreadQueue  (KERNEL.463)
1048  */
1049 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1050 {
1051     HQUEUE16 oldQueue = NtCurrentTeb()->queue;
1052
1053     if (thread && thread != GetCurrentThreadId())
1054     {
1055         FIXME( "not supported on other thread %04lx\n", thread );
1056         return 0;
1057     }
1058     NtCurrentTeb()->queue = hQueue;
1059     if ( GetTaskQueue16( NtCurrentTeb()->htask16 ) == oldQueue )
1060         SetTaskQueue16( NtCurrentTeb()->htask16, hQueue );
1061     return oldQueue;
1062 }
1063
1064 /***********************************************************************
1065  *           GetThreadQueue  (KERNEL.464)
1066  */
1067 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1068 {
1069     if (thread && thread != GetCurrentThreadId())
1070     {
1071         FIXME( "not supported on other thread %04lx\n", thread );
1072         return 0;
1073     }
1074     return NtCurrentTeb()->queue;
1075 }
1076
1077 /***********************************************************************
1078  *           SetFastQueue  (KERNEL.624)
1079  */
1080 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1081 {
1082     if (!thread || thread == GetCurrentThreadId())
1083         NtCurrentTeb()->queue = hQueue;
1084     else
1085         FIXME( "not supported on other thread %04lx\n", thread );
1086 }
1087
1088 /***********************************************************************
1089  *           GetFastQueue  (KERNEL.625)
1090  */
1091 HQUEUE16 WINAPI GetFastQueue16( void )
1092 {
1093     HQUEUE16 ret = NtCurrentTeb()->queue;
1094
1095     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1096     return ret;
1097 }
1098
1099 /***********************************************************************
1100  *           SwitchStackTo   (KERNEL.108)
1101  */
1102 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1103 {
1104     STACK16FRAME *oldFrame, *newFrame;
1105     INSTANCEDATA *pData;
1106     UINT16 copySize;
1107
1108     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1109     TRACE("old=%04x:%04x new=%04x:%04x\n",
1110           SELECTOROF( NtCurrentTeb()->cur_stack ),
1111           OFFSETOF( NtCurrentTeb()->cur_stack ), seg, ptr );
1112
1113     /* Save the old stack */
1114
1115     oldFrame = CURRENT_STACK16;
1116     /* pop frame + args and push bp */
1117     pData->old_ss_sp   = NtCurrentTeb()->cur_stack + sizeof(STACK16FRAME)
1118                            + 2 * sizeof(WORD);
1119     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1120     pData->stacktop    = top;
1121     pData->stackmin    = ptr;
1122     pData->stackbottom = ptr;
1123
1124     /* Switch to the new stack */
1125
1126     /* Note: we need to take the 3 arguments into account; otherwise,
1127      * the stack will underflow upon return from this function.
1128      */
1129     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1130     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1131     NtCurrentTeb()->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1132     newFrame = CURRENT_STACK16;
1133
1134     /* Copy the stack frame and the local variables to the new stack */
1135
1136     memmove( newFrame, oldFrame, copySize );
1137     newFrame->bp = ptr;
1138     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1139 }
1140
1141
1142 /***********************************************************************
1143  *           SwitchStackBack   (KERNEL.109)
1144  */
1145 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1146 {
1147     STACK16FRAME *oldFrame, *newFrame;
1148     INSTANCEDATA *pData;
1149
1150     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1151         return;
1152     if (!pData->old_ss_sp)
1153     {
1154         WARN("No previous SwitchStackTo\n" );
1155         return;
1156     }
1157     TRACE("restoring stack %04x:%04x\n",
1158           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1159
1160     oldFrame = CURRENT_STACK16;
1161
1162     /* Pop bp from the previous stack */
1163
1164     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1165     pData->old_ss_sp += sizeof(WORD);
1166
1167     /* Switch back to the old stack */
1168
1169     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1170     context->SegSs = SELECTOROF(pData->old_ss_sp);
1171     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1172     pData->old_ss_sp = 0;
1173
1174     /* Build a stack frame for the return */
1175
1176     newFrame = CURRENT_STACK16;
1177     newFrame->frame32     = oldFrame->frame32;
1178     newFrame->module_cs   = oldFrame->module_cs;
1179     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1180     newFrame->entry_ip    = oldFrame->entry_ip;
1181 }
1182
1183
1184 /***********************************************************************
1185  *           GetTaskQueueDS  (KERNEL.118)
1186  */
1187 void WINAPI GetTaskQueueDS16(void)
1188 {
1189     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1190 }
1191
1192
1193 /***********************************************************************
1194  *           GetTaskQueueES  (KERNEL.119)
1195  */
1196 void WINAPI GetTaskQueueES16(void)
1197 {
1198     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1199 }
1200
1201
1202 /***********************************************************************
1203  *           GetCurrentTask   (KERNEL32.@)
1204  */
1205 HTASK16 WINAPI GetCurrentTask(void)
1206 {
1207     return NtCurrentTeb()->htask16;
1208 }
1209
1210 /***********************************************************************
1211  *           GetCurrentTask   (KERNEL.36)
1212  */
1213 DWORD WINAPI WIN16_GetCurrentTask(void)
1214 {
1215     /* This is the version used by relay code; the first task is */
1216     /* returned in the high word of the result */
1217     return MAKELONG( GetCurrentTask(), hFirstTask );
1218 }
1219
1220
1221 /***********************************************************************
1222  *           GetCurrentPDB   (KERNEL.37)
1223  *
1224  * UNDOC: returns PSP of KERNEL in high word
1225  */
1226 DWORD WINAPI GetCurrentPDB16(void)
1227 {
1228     TDB *pTask;
1229
1230     if (!(pTask = TASK_GetCurrent())) return 0;
1231     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1232 }
1233
1234
1235 /***********************************************************************
1236  *           GetCurPID   (KERNEL.157)
1237  */
1238 DWORD WINAPI GetCurPID16( DWORD unused )
1239 {
1240     return 0;
1241 }
1242
1243
1244 /***********************************************************************
1245  *           GetInstanceData   (KERNEL.54)
1246  */
1247 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1248 {
1249     char *ptr = (char *)GlobalLock16( instance );
1250     if (!ptr || !len) return 0;
1251     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1252     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1253     return len;
1254 }
1255
1256
1257 /***********************************************************************
1258  *           GetExeVersion   (KERNEL.105)
1259  */
1260 WORD WINAPI GetExeVersion16(void)
1261 {
1262     TDB *pTask;
1263
1264     if (!(pTask = TASK_GetCurrent())) return 0;
1265     return pTask->version;
1266 }
1267
1268
1269 /***********************************************************************
1270  *           SetErrorMode   (KERNEL.107)
1271  */
1272 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1273 {
1274     TDB *pTask;
1275     if (!(pTask = TASK_GetCurrent())) return 0;
1276     pTask->error_mode = mode;
1277     return SetErrorMode( mode );
1278 }
1279
1280
1281 /***********************************************************************
1282  *           GetNumTasks   (KERNEL.152)
1283  */
1284 UINT16 WINAPI GetNumTasks16(void)
1285 {
1286     return nTaskCount;
1287 }
1288
1289
1290 /***********************************************************************
1291  *           GetTaskDS   (KERNEL.155)
1292  *
1293  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1294  * I don't think we need to bother with this.
1295  */
1296 HINSTANCE16 WINAPI GetTaskDS16(void)
1297 {
1298     TDB *pTask;
1299
1300     if (!(pTask = TASK_GetCurrent())) return 0;
1301     return GlobalHandleToSel16(pTask->hInstance);
1302 }
1303
1304 /***********************************************************************
1305  *           GetDummyModuleHandleDS   (KERNEL.602)
1306  */
1307 WORD WINAPI GetDummyModuleHandleDS16(void)
1308 {
1309     TDB *pTask;
1310     WORD selector;
1311
1312     if (!(pTask = TASK_GetCurrent())) return 0;
1313     if (!(pTask->flags & TDBF_WIN32)) return 0;
1314     selector = GlobalHandleToSel16( pTask->hModule );
1315     CURRENT_DS = selector;
1316     return selector;
1317 }
1318
1319 /***********************************************************************
1320  *           IsTask   (KERNEL.320)
1321  */
1322 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1323 {
1324     TDB *pTask;
1325
1326     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1327     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1328     return (pTask->magic == TDB_MAGIC);
1329 }
1330
1331
1332 /***********************************************************************
1333  *           IsWinOldApTask   (KERNEL.158)
1334  */
1335 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1336 {
1337     /* should return bit 0 of byte 0x48 in PSP */
1338     return FALSE;
1339 }
1340
1341 /***********************************************************************
1342  *           SetTaskSignalProc   (KERNEL.38)
1343  */
1344 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1345 {
1346     TDB *pTask;
1347     FARPROC16 oldProc;
1348
1349     if (!hTask) hTask = GetCurrentTask();
1350     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1351     oldProc = pTask->userhandler;
1352     pTask->userhandler = proc;
1353     return oldProc;
1354 }
1355
1356 /***********************************************************************
1357  *           SetSigHandler   (KERNEL.140)
1358  */
1359 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1360                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1361 {
1362     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1363           newhandler,oldhandler,oldmode,newmode,flag );
1364
1365     if (flag != 1) return 0;
1366     if (!newmode) newhandler = NULL;  /* Default handler */
1367     if (newmode != 4)
1368     {
1369         TDB *pTask;
1370
1371         if (!(pTask = TASK_GetCurrent())) return 0;
1372         if (oldmode) *oldmode = pTask->signal_flags;
1373         pTask->signal_flags = newmode;
1374         if (oldhandler) *oldhandler = pTask->sighandler;
1375         pTask->sighandler = newhandler;
1376     }
1377     return 0;
1378 }
1379
1380
1381 /***********************************************************************
1382  *           GlobalNotify   (KERNEL.154)
1383  *
1384  * Note that GlobalNotify does _not_ return the old NotifyProc
1385  * -- contrary to LocalNotify !!
1386  */
1387 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1388 {
1389     TDB *pTask;
1390
1391     if (!(pTask = TASK_GetCurrent())) return;
1392     pTask->discardhandler = proc;
1393 }
1394
1395
1396 /***********************************************************************
1397  *           GetExePtrHelper
1398  */
1399 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1400 {
1401     char *ptr;
1402     HANDLE16 owner;
1403
1404       /* Check for module handle */
1405
1406     if (!(ptr = GlobalLock16( handle ))) return 0;
1407     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1408
1409       /* Search for this handle inside all tasks */
1410
1411     *hTask = hFirstTask;
1412     while (*hTask)
1413     {
1414         TDB *pTask = TASK_GetPtr( *hTask );
1415         if ((*hTask == handle) ||
1416             (pTask->hInstance == handle) ||
1417             (pTask->hQueue == handle) ||
1418             (pTask->hPDB == handle)) return pTask->hModule;
1419         *hTask = pTask->hNext;
1420     }
1421
1422       /* Check the owner for module handle */
1423
1424     owner = FarGetOwner16( handle );
1425     if (!(ptr = GlobalLock16( owner ))) return 0;
1426     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1427
1428       /* Search for the owner inside all tasks */
1429
1430     *hTask = hFirstTask;
1431     while (*hTask)
1432     {
1433         TDB *pTask = TASK_GetPtr( *hTask );
1434         if ((*hTask == owner) ||
1435             (pTask->hInstance == owner) ||
1436             (pTask->hQueue == owner) ||
1437             (pTask->hPDB == owner)) return pTask->hModule;
1438         *hTask = pTask->hNext;
1439     }
1440
1441     return 0;
1442 }
1443
1444 /***********************************************************************
1445  *           GetExePtr   (KERNEL.133)
1446  */
1447 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1448 {
1449     HTASK16 hTask = 0;
1450     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1451     STACK16FRAME *frame = CURRENT_STACK16;
1452     frame->ecx = hModule;
1453     if (hTask) frame->es = hTask;
1454     return hModule;
1455 }
1456
1457
1458 /***********************************************************************
1459  *           K228   (KERNEL.228)
1460  */
1461 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1462 {
1463     HTASK16 hTask = 0;
1464     return GetExePtrHelper( handle, &hTask );
1465 }
1466
1467
1468 /***********************************************************************
1469  *           TaskFirst   (TOOLHELP.63)
1470  */
1471 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1472 {
1473     lpte->hNext = hFirstTask;
1474     return TaskNext16( lpte );
1475 }
1476
1477
1478 /***********************************************************************
1479  *           TaskNext   (TOOLHELP.64)
1480  */
1481 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1482 {
1483     TDB *pTask;
1484     INSTANCEDATA *pInstData;
1485
1486     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1487     if (!lpte->hNext) return FALSE;
1488
1489     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1490     while (1) {
1491         pTask = TASK_GetPtr( lpte->hNext );
1492         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1493         if (pTask->hInstance)
1494             break;
1495         lpte->hNext = pTask->hNext;
1496     }
1497     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1498     lpte->hTask         = lpte->hNext;
1499     lpte->hTaskParent   = pTask->hParent;
1500     lpte->hInst         = pTask->hInstance;
1501     lpte->hModule       = pTask->hModule;
1502     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1503     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1504     lpte->wStackTop     = pInstData->stacktop;
1505     lpte->wStackMinimum = pInstData->stackmin;
1506     lpte->wStackBottom  = pInstData->stackbottom;
1507     lpte->wcEvents      = pTask->nEvents;
1508     lpte->hQueue        = pTask->hQueue;
1509     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1510     lpte->wPSPOffset    = 0x100;  /*??*/
1511     lpte->hNext         = pTask->hNext;
1512     return TRUE;
1513 }
1514
1515
1516 /***********************************************************************
1517  *           TaskFindHandle   (TOOLHELP.65)
1518  */
1519 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1520 {
1521     lpte->hNext = hTask;
1522     return TaskNext16( lpte );
1523 }
1524
1525
1526 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1527
1528 /**************************************************************************
1529  *           FatalAppExit   (KERNEL.137)
1530  */
1531 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1532 {
1533     TDB *pTask = TASK_GetCurrent();
1534
1535     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1536     {
1537         HMODULE mod = GetModuleHandleA( "user32.dll" );
1538         if (mod)
1539         {
1540             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1541             if (pMessageBoxA)
1542             {
1543                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1544                 goto done;
1545             }
1546         }
1547         ERR( "%s\n", debugstr_a(str) );
1548     }
1549  done:
1550     ExitThread(0xff);
1551 }
1552
1553
1554 /***********************************************************************
1555  *           TerminateApp   (TOOLHELP.77)
1556  *
1557  * See "Undocumented Windows".
1558  */
1559 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1560 {
1561     if (hTask && hTask != GetCurrentTask())
1562     {
1563         FIXME("cannot terminate task %x\n", hTask);
1564         return;
1565     }
1566
1567     if (wFlags & NO_UAE_BOX)
1568     {
1569         UINT16 old_mode;
1570         old_mode = SetErrorMode16(0);
1571         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1572     }
1573     FatalAppExit16( 0, NULL );
1574
1575     /* hmm, we're still alive ?? */
1576
1577     /* check undocumented flag */
1578     if (!(wFlags & 0x8000))
1579         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1580
1581     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1582        but let's just call ExitThread */
1583     ExitThread(0xff);
1584 }
1585
1586
1587 /***********************************************************************
1588  *           GetAppCompatFlags   (KERNEL.354)
1589  */
1590 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1591 {
1592     TDB *pTask;
1593
1594     if (!hTask) hTask = GetCurrentTask();
1595     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1596     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1597     return pTask->compat_flags;
1598 }
1599
1600
1601 /***********************************************************************
1602  *           GetDOSEnvironment     (KERNEL.131)
1603  *
1604  * Note: the environment is allocated once, it doesn't track changes
1605  * made using the Win32 API. This shouldn't matter.
1606  *
1607  * Format of a 16-bit environment block:
1608  * ASCIIZ   string 1 (xx=yy format)
1609  * ...
1610  * ASCIIZ   string n
1611  * BYTE     0
1612  * WORD     1
1613  * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1614  */
1615 SEGPTR WINAPI GetDOSEnvironment16(void)
1616 {
1617     static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1618     static HGLOBAL16 handle;  /* handle to the 16 bit environment */
1619
1620     if (!handle)
1621     {
1622         DWORD size;
1623         LPSTR p, env;
1624
1625         p = env = GetEnvironmentStringsA();
1626         while (*p) p += strlen(p) + 1;
1627         p++;  /* skip last null */
1628         size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1629         handle = GlobalAlloc16( GMEM_FIXED, size );
1630         if (handle)
1631         {
1632             WORD one = 1;
1633             LPSTR env16 = GlobalLock16( handle );
1634             memcpy( env16, env, p - env );
1635             memcpy( env16 + (p - env), &one, sizeof(one));
1636             memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1637             GlobalUnlock16( handle );
1638         }
1639         FreeEnvironmentStringsA( env );
1640     }
1641     return K32WOWGlobalLock16( handle );
1642 }