dlls/krnl386.exe16/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 <stdarg.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <assert.h>
  25
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "wingdi.h"
  29 #include "winnt.h"
  30 #include "wownt32.h"
  31 #include "winuser.h"
  32
  33 #include "wine/winbase16.h"
  34 #include "winternl.h"
  35 #include "kernel16_private.h"
  36
  37 #include "wine/debug.h"
  38
  39 WINE_DEFAULT_DEBUG_CHANNEL(task);
  40
  41 #include "pshpack1.h"
  42
  43 struct thunk
  44 {
  45     BYTE      movw;
  46     HANDLE16  instance;
  47     BYTE      ljmp;
  48     FARPROC16 func;
  49 };
  50
  51 /* Segment containing MakeProcInstance() thunks */
  52 typedef struct
  53 {
  54     WORD  next;       /* Selector of next segment */
  55     WORD  magic;      /* Thunks signature */
  56     WORD  unused;
  57     WORD  free;       /* Head of the free list */
  58     struct thunk thunks[1];
  59 } THUNKS;
  60
  61 #include "poppack.h"
  62
  63 #define THUNK_MAGIC  ('P' | ('T' << 8))
  64
  65   /* Min. number of thunks allocated when creating a new segment */
  66 #define MIN_THUNKS  32
  67
  68 #define TDB_MAGIC    ('T' | ('D' << 8))
  69
  70 static THHOOK DefaultThhook;
  71 THHOOK *pThhook = &DefaultThhook;
  72
  73 #define hFirstTask   (pThhook->HeadTDB)
  74 #define hLockedTask  (pThhook->LockTDB)
  75
  76 static UINT16 nTaskCount = 0;
  77
  78 static HTASK16 initial_task, main_task;
  79
  80 /***********************************************************************
  81  *           TASK_InstallTHHook
  82  */
  83 void TASK_InstallTHHook( THHOOK *pNewThhook )
  84 {
  85      THHOOK *pOldThhook = pThhook;
  86
  87      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  88
  89      *pThhook = *pOldThhook;
  90 }
  91
  92 /***********************************************************************
  93  *           TASK_GetPtr
  94  */
  95 static TDB *TASK_GetPtr( HTASK16 hTask )
  96 {
  97     return GlobalLock16( hTask );
  98 }
  99
 100
 101 /***********************************************************************
 102  *           TASK_GetCurrent
 103  */
 104 TDB *TASK_GetCurrent(void)
 105 {
 106     return TASK_GetPtr( GetCurrentTask() );
 107 }
 108
 109
 110 /***********************************************************************
 111  *           TASK_LinkTask
 112  */
 113 static void TASK_LinkTask( HTASK16 hTask )
 114 {
 115     HTASK16 *prevTask;
 116     TDB *pTask;
 117
 118     if (!(pTask = TASK_GetPtr( hTask ))) return;
 119     prevTask = &hFirstTask;
 120     while (*prevTask)
 121     {
 122         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 123         if (prevTaskPtr->priority >= pTask->priority) break;
 124         prevTask = &prevTaskPtr->hNext;
 125     }
 126     pTask->hNext = *prevTask;
 127     *prevTask = hTask;
 128     nTaskCount++;
 129 }
 130
 131
 132 /***********************************************************************
 133  *           TASK_UnlinkTask
 134  */
 135 static void TASK_UnlinkTask( HTASK16 hTask )
 136 {
 137     HTASK16 *prevTask;
 138     TDB *pTask;
 139
 140     prevTask = &hFirstTask;
 141     while (*prevTask && (*prevTask != hTask))
 142     {
 143         pTask = TASK_GetPtr( *prevTask );
 144         prevTask = &pTask->hNext;
 145     }
 146     if (*prevTask)
 147     {
 148         pTask = TASK_GetPtr( *prevTask );
 149         *prevTask = pTask->hNext;
 150         pTask->hNext = 0;
 151         nTaskCount--;
 152     }
 153 }
 154
 155
 156 /***********************************************************************
 157  *           TASK_CreateThunks
 158  *
 159  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 160  * and containing 'count' entries.
 161  */
 162 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 163 {
 164     int i;
 165     THUNKS *pThunk;
 166
 167     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 168     pThunk->next = 0;
 169     pThunk->magic = THUNK_MAGIC;
 170     pThunk->free = FIELD_OFFSET( THUNKS, thunks );
 171     for (i = 0; i < count-1; i++)
 172         *(WORD *)&pThunk->thunks[i] = FIELD_OFFSET( THUNKS, thunks[i+1] );
 173     *(WORD *)&pThunk->thunks[i] = 0;  /* Last thunk */
 174 }
 175
 176
 177 /***********************************************************************
 178  *           TASK_AllocThunk
 179  *
 180  * Allocate a thunk for MakeProcInstance().
 181  */
 182 static SEGPTR TASK_AllocThunk(void)
 183 {
 184     TDB *pTask;
 185     THUNKS *pThunk;
 186     WORD sel, base;
 187
 188     if (!(pTask = TASK_GetCurrent())) return 0;
 189     sel = pTask->hCSAlias;
 190     pThunk = (THUNKS *)pTask->thunks;
 191     base = (char *)pThunk - (char *)pTask;
 192     while (!pThunk->free)
 193     {
 194         sel = pThunk->next;
 195         if (!sel)  /* Allocate a new segment */
 196         {
 197             sel = GLOBAL_Alloc( GMEM_FIXED, FIELD_OFFSET( THUNKS, thunks[MIN_THUNKS] ),
 198                                 pTask->hPDB, LDT_FLAGS_CODE );
 199             if (!sel) return 0;
 200             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 201             pThunk->next = sel;
 202         }
 203         pThunk = GlobalLock16( sel );
 204         base = 0;
 205     }
 206     base += pThunk->free;
 207     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 208     return MAKESEGPTR( sel, base );
 209 }
 210
 211
 212 /***********************************************************************
 213  *           TASK_FreeThunk
 214  *
 215  * Free a MakeProcInstance() thunk.
 216  */
 217 static BOOL TASK_FreeThunk( SEGPTR thunk )
 218 {
 219     TDB *pTask;
 220     THUNKS *pThunk;
 221     WORD sel, base;
 222
 223     if (!(pTask = TASK_GetCurrent())) return FALSE;
 224     sel = pTask->hCSAlias;
 225     pThunk = (THUNKS *)pTask->thunks;
 226     base = (char *)pThunk - (char *)pTask;
 227     while (sel && (sel != HIWORD(thunk)))
 228     {
 229         sel = pThunk->next;
 230         pThunk = GlobalLock16( sel );
 231         base = 0;
 232     }
 233     if (!sel) return FALSE;
 234     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 235     pThunk->free = LOWORD(thunk) - base;
 236     return TRUE;
 237 }
 238
 239
 240 /***********************************************************************
 241  *           TASK_Create
 242  *
 243  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 244  *       to be careful to protect global data structures. We do this
 245  *       by entering the Win16Lock while linking the task into the
 246  *       global task list.
 247  */
 248 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
 249 {
 250     HTASK16 hTask;
 251     TDB *pTask;
 252     FARPROC16 proc;
 253     char curdir[MAX_PATH];
 254     HMODULE16 hModule = pModule ? pModule->self : 0;
 255
 256       /* Allocate the task structure */
 257
 258     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 259     if (!hTask) return NULL;
 260     pTask = TASK_GetPtr( hTask );
 261     FarSetOwner16( hTask, hModule );
 262
 263     /* Fill the task structure */
 264
 265     pTask->hSelf = hTask;
 266
 267     pTask->version       = pModule ? pModule->ne_expver : 0x0400;
 268     pTask->hModule       = hModule;
 269     pTask->hParent       = GetCurrentTask();
 270     pTask->magic         = TDB_MAGIC;
 271     pTask->nCmdShow      = cmdShow;
 272
 273     GetCurrentDirectoryA( sizeof(curdir), curdir );
 274     GetShortPathNameA( curdir, curdir, sizeof(curdir) );
 275     pTask->curdrive = (curdir[0] - 'A') | 0x80;
 276     lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
 277
 278       /* Create the thunks block */
 279
 280     TASK_CreateThunks( hTask, (char *)pTask->thunks - (char *)pTask, 7 );
 281
 282       /* Copy the module name */
 283
 284     if (hModule)
 285     {
 286         char name[sizeof(pTask->module_name)+1];
 287         size_t len;
 288         GetModuleName16( hModule, name, sizeof(name) );
 289         len = strlen(name) + 1;
 290         memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
 291         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 292     }
 293
 294       /* Allocate a selector for the PDB */
 295
 296     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 297                                       hModule, LDT_FLAGS_DATA );
 298
 299       /* Fill the PDB */
 300
 301     pTask->pdb.int20 = 0x20cd;
 302     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 303     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 304     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 305     pTask->pdb.savedint22 = 0;
 306     pTask->pdb.savedint23 = 0;
 307     pTask->pdb.savedint24 = 0;
 308     pTask->pdb.fileHandlesPtr =
 309         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), FIELD_OFFSET( PDB16, fileHandles ));
 310     pTask->pdb.hFileHandles = 0;
 311     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 312     /* FIXME: should we make a copy of the environment? */
 313     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 314     pTask->pdb.nbFiles        = 20;
 315
 316     /* Fill the command line */
 317
 318     if (!cmdline)
 319     {
 320         cmdline = GetCommandLineA();
 321         /* remove the first word (program name) */
 322         if (*cmdline == '"')
 323             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 324         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 325         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 326         len = strlen(cmdline);
 327     }
 328     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 329     pTask->pdb.cmdLine[0] = len;
 330     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 331     /* pTask->pdb.cmdLine[len+1] = 0; */
 332
 333     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 334
 335       /* Allocate a code segment alias for the TDB */
 336
 337     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, pTask, sizeof(TDB),
 338                                           pTask->hPDB, LDT_FLAGS_CODE );
 339
 340       /* Default DTA overwrites command line */
 341
 342     pTask->dta = MAKESEGPTR( pTask->hPDB, FIELD_OFFSET( PDB16, cmdLine ));
 343
 344     /* Create scheduler event for 16-bit tasks */
 345
 346     if ( !(pTask->flags & TDBF_WIN32) )
 347         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, NotificationEvent, FALSE );
 348
 349     if (!initial_task) initial_task = hTask;
 350
 351     return pTask;
 352 }
 353
 354
 355 /***********************************************************************
 356  *           TASK_DeleteTask
 357  */
 358 static void TASK_DeleteTask( HTASK16 hTask )
 359 {
 360     TDB *pTask;
 361     HGLOBAL16 hPDB;
 362
 363     if (!(pTask = TASK_GetPtr( hTask ))) return;
 364     hPDB = pTask->hPDB;
 365
 366     pTask->magic = 0xdead; /* invalidate signature */
 367
 368     /* Free the selector aliases */
 369
 370     GLOBAL_FreeBlock( pTask->hCSAlias );
 371     GLOBAL_FreeBlock( pTask->hPDB );
 372
 373     /* Free the task module */
 374
 375     FreeModule16( pTask->hModule );
 376
 377     /* Free the task structure itself */
 378
 379     GlobalFree16( hTask );
 380
 381     /* Free all memory used by this task (including the 32-bit stack, */
 382     /* the environment block and the thunk segments). */
 383
 384     GlobalFreeAll16( hPDB );
 385 }
 386
 387
 388 /***********************************************************************
 389  *           TASK_CreateMainTask
 390  *
 391  * Create a task for the main (32-bit) process.
 392  */
 393 void TASK_CreateMainTask(void)
 394 {
 395     TDB *pTask;
 396     STARTUPINFOA startup_info;
 397     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 398
 399     GetStartupInfoA( &startup_info );
 400     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 401     pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
 402     if (!pTask)
 403     {
 404         ERR("could not create task for main process\n");
 405         ExitProcess(1);
 406     }
 407
 408     pTask->flags        |= TDBF_WIN32;
 409     pTask->hInstance     = 0;
 410     pTask->hPrevInstance = 0;
 411     pTask->teb           = NtCurrentTeb();
 412
 413     /* Add the task to the linked list */
 414     /* (no need to get the win16 lock, we are the only thread at this point) */
 415     TASK_LinkTask( pTask->hSelf );
 416     main_task = pTask->hSelf;
 417 }
 418
 419
 420 struct create_data
 421 {
 422     TDB                 *task;
 423     WIN16_SUBSYSTEM_TIB *tib;
 424 };
 425
 426 /* allocate the win16 TIB for a new 16-bit task */
 427 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
 428 {
 429     WCHAR path[MAX_PATH];
 430     WIN16_SUBSYSTEM_TIB *tib;
 431     UNICODE_STRING *curdir;
 432     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 433
 434     if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
 435     MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 436     GetLongPathNameW( path, path, MAX_PATH );
 437     if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
 438     else tib->exe_name = NULL;
 439
 440     RtlAcquirePebLock();
 441     if (NtCurrentTeb()->Tib.SubSystemTib)
 442         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 443     else
 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 static inline void free_win16_tib( WIN16_SUBSYSTEM_TIB *tib )
 456 {
 457     if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
 458     HeapFree( GetProcessHeap(), 0, tib );
 459 }
 460
 461 /* startup routine for a new 16-bit thread */
 462 static DWORD CALLBACK task_start( LPVOID p )
 463 {
 464     struct create_data *data = p;
 465     TDB *pTask = data->task;
 466     DWORD ret;
 467
 468     kernel_get_thread_data()->htask16 = pTask->hSelf;
 469     NtCurrentTeb()->Tib.SubSystemTib = data->tib;
 470     HeapFree( GetProcessHeap(), 0, data );
 471
 472     _EnterWin16Lock();
 473     TASK_LinkTask( pTask->hSelf );
 474     pTask->teb = NtCurrentTeb();
 475     ret = NE_StartTask();
 476     _LeaveWin16Lock();
 477     return ret;
 478 }
 479
 480
 481 /***********************************************************************
 482  *           TASK_SpawnTask
 483  *
 484  * Spawn a new 16-bit task.
 485  */
 486 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 487                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 488 {
 489     struct create_data *data = NULL;
 490     WIN16_SUBSYSTEM_TIB *tib;
 491     TDB *pTask;
 492
 493     if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
 494     if (!(tib = allocate_win16_tib( pTask ))) goto failed;
 495     if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data)))) goto failed;
 496     data->task = pTask;
 497     data->tib = tib;
 498     if (!(*hThread = CreateThread( NULL, 0, task_start, data, 0, NULL ))) goto failed;
 499     return pTask->hSelf;
 500
 501 failed:
 502     if (tib) free_win16_tib( tib );
 503     HeapFree( GetProcessHeap(), 0, data );
 504     TASK_DeleteTask( pTask->hSelf );
 505     return 0;
 506 }
 507
 508
 509 /***********************************************************************
 510  *           TASK_GetTaskFromThread
 511  */
 512 HTASK16 TASK_GetTaskFromThread( DWORD thread )
 513 {
 514     TDB *p = TASK_GetPtr( hFirstTask );
 515     while (p)
 516     {
 517         if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
 518         p = TASK_GetPtr( p->hNext );
 519     }
 520     return 0;
 521 }
 522
 523
 524 /***********************************************************************
 525  *           TASK_CallTaskSignalProc
 526  */
 527 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
 528 {
 529     WORD args[5];
 530     TDB *pTask = TASK_GetCurrent();
 531
 532     if ( !pTask || !pTask->userhandler ) return;
 533
 534     args[4] = hTaskOrModule;
 535     args[3] = uCode;
 536     args[2] = 0;
 537     args[1] = pTask->hInstance;
 538     args[0] = pTask->hQueue;
 539     WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
 540 }
 541
 542
 543 /***********************************************************************
 544  *           TASK_ExitTask
 545  */
 546 void TASK_ExitTask(void)
 547 {
 548     WIN16_SUBSYSTEM_TIB *tib;
 549     TDB *pTask;
 550     DWORD lockCount;
 551
 552     /* Enter the Win16Lock to protect global data structures */
 553     _EnterWin16Lock();
 554
 555     pTask = TASK_GetCurrent();
 556     if ( !pTask )
 557     {
 558         _LeaveWin16Lock();
 559         return;
 560     }
 561
 562     TRACE("Killing task %04x\n", pTask->hSelf );
 563
 564     /* Perform USER cleanup */
 565
 566     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 567
 568     /* Remove the task from the list to be sure we never switch back to it */
 569     TASK_UnlinkTask( pTask->hSelf );
 570
 571     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 572     {
 573         TRACE("this is the last task, exiting\n" );
 574         ExitKernel16();
 575     }
 576
 577     pTask->nEvents = 0;
 578
 579     if ( hLockedTask == pTask->hSelf )
 580         hLockedTask = 0;
 581
 582     TASK_DeleteTask( pTask->hSelf );
 583
 584     if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
 585     {
 586         free_win16_tib( tib );
 587         NtCurrentTeb()->Tib.SubSystemTib = NULL;
 588     }
 589
 590     /* ... and completely release the Win16Lock, just in case. */
 591     ReleaseThunkLock( &lockCount );
 592 }
 593
 594
 595 /***********************************************************************
 596  *           ExitKernel (KERNEL.2)
 597  *
 598  * Clean-up everything and exit the Wine process.
 599  */
 600 void WINAPI ExitKernel16(void)
 601 {
 602     WriteOutProfiles16();
 603     TerminateProcess( GetCurrentProcess(), 0 );
 604 }
 605
 606
 607 /***********************************************************************
 608  *           InitTask  (KERNEL.91)
 609  *
 610  * Called by the application startup code.
 611  */
 612 void WINAPI InitTask16( CONTEXT *context )
 613 {
 614     TDB *pTask;
 615     INSTANCEDATA *pinstance;
 616     SEGPTR ptr;
 617
 618     context->Eax = 0;
 619     if (!(pTask = TASK_GetCurrent())) return;
 620
 621     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 622        as some apps, notably Visual Basic apps, *modify* the heap/stack
 623        size of the instance data segment before calling InitTask() */
 624
 625     /* Initialize the INSTANCEDATA structure */
 626     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 627     pinstance->stackmin    = CURRENT_SP + sizeof( STACK16FRAME );
 628     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 629     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 630                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 631
 632     /* Initialize the local heap */
 633     if (LOWORD(context->Ecx))
 634         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 635
 636     /* Initialize implicitly loaded DLLs */
 637     NE_InitializeDLLs( pTask->hModule );
 638     NE_DllProcessAttach( pTask->hModule );
 639
 640     /* Registers on return are:
 641      * ax     1 if OK, 0 on error
 642      * cx     stack limit in bytes
 643      * dx     cmdShow parameter
 644      * si     instance handle of the previous instance
 645      * di     instance handle of the new task
 646      * es:bx  pointer to command line inside PSP
 647      *
 648      * 0 (=%bp) is pushed on the stack
 649      */
 650     ptr = stack16_push( sizeof(WORD) );
 651     *(WORD *)MapSL(ptr) = 0;
 652     context->Esp -= 2;
 653
 654     context->Eax = 1;
 655
 656     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 657     else
 658     {
 659         LPBYTE p = &pTask->pdb.cmdLine[1];
 660         while ((*p == ' ') || (*p == '\t')) p++;
 661         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 662     }
 663     context->Ecx   = pinstance->stacktop;
 664     context->Edx   = pTask->nCmdShow;
 665     context->Esi   = (DWORD)pTask->hPrevInstance;
 666     context->Edi   = (DWORD)pTask->hInstance;
 667     context->SegEs = (WORD)pTask->hPDB;
 668 }
 669
 670
 671 /***********************************************************************
 672  *           WaitEvent  (KERNEL.30)
 673  */
 674 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 675 {
 676     TDB *pTask;
 677
 678     if (!hTask) hTask = GetCurrentTask();
 679     pTask = TASK_GetPtr( hTask );
 680
 681     if (pTask->flags & TDBF_WIN32)
 682     {
 683         FIXME("called for Win32 thread (%04x)!\n", GetCurrentThreadId());
 684         return TRUE;
 685     }
 686
 687     if (pTask->nEvents > 0)
 688     {
 689         pTask->nEvents--;
 690         return FALSE;
 691     }
 692
 693     if (pTask->teb == NtCurrentTeb())
 694     {
 695         DWORD lockCount;
 696
 697         NtResetEvent( pTask->hEvent, NULL );
 698         ReleaseThunkLock( &lockCount );
 699         SYSLEVEL_CheckNotLevel( 1 );
 700         WaitForSingleObject( pTask->hEvent, INFINITE );
 701         RestoreThunkLock( lockCount );
 702         if (pTask->nEvents > 0) pTask->nEvents--;
 703     }
 704     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 705
 706     return TRUE;
 707 }
 708
 709
 710 /***********************************************************************
 711  *           PostEvent  (KERNEL.31)
 712  */
 713 void WINAPI PostEvent16( HTASK16 hTask )
 714 {
 715     TDB *pTask;
 716
 717     if (!hTask) hTask = GetCurrentTask();
 718     if (!(pTask = TASK_GetPtr( hTask ))) return;
 719
 720     if (pTask->flags & TDBF_WIN32)
 721     {
 722         FIXME("called for Win32 thread (%04x)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
 723         return;
 724     }
 725
 726     pTask->nEvents++;
 727
 728     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 729 }
 730
 731
 732 /***********************************************************************
 733  *           SetPriority  (KERNEL.32)
 734  */
 735 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 736 {
 737     TDB *pTask;
 738     INT16 newpriority;
 739
 740     if (!hTask) hTask = GetCurrentTask();
 741     if (!(pTask = TASK_GetPtr( hTask ))) return;
 742     newpriority = pTask->priority + delta;
 743     if (newpriority < -32) newpriority = -32;
 744     else if (newpriority > 15) newpriority = 15;
 745
 746     pTask->priority = newpriority + 1;
 747     TASK_UnlinkTask( pTask->hSelf );
 748     TASK_LinkTask( pTask->hSelf );
 749     pTask->priority--;
 750 }
 751
 752
 753 /***********************************************************************
 754  *           LockCurrentTask  (KERNEL.33)
 755  */
 756 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 757 {
 758     if (bLock) hLockedTask = GetCurrentTask();
 759     else hLockedTask = 0;
 760     return hLockedTask;
 761 }
 762
 763
 764 /***********************************************************************
 765  *           IsTaskLocked  (KERNEL.122)
 766  */
 767 HTASK16 WINAPI IsTaskLocked16(void)
 768 {
 769     return hLockedTask;
 770 }
 771
 772
 773 /***********************************************************************
 774  *           OldYield  (KERNEL.117)
 775  */
 776 void WINAPI OldYield16(void)
 777 {
 778    DWORD count;
 779
 780    ReleaseThunkLock(&count);
 781    RestoreThunkLock(count);
 782 }
 783
 784 /***********************************************************************
 785  *           WIN32_OldYield  (KERNEL.447)
 786  */
 787 void WINAPI WIN32_OldYield16(void)
 788 {
 789    DWORD count;
 790
 791    ReleaseThunkLock(&count);
 792    RestoreThunkLock(count);
 793 }
 794
 795 /***********************************************************************
 796  *           DirectedYield  (KERNEL.150)
 797  */
 798 void WINAPI DirectedYield16( HTASK16 hTask )
 799 {
 800     OldYield16();
 801 }
 802
 803 /***********************************************************************
 804  *           Yield  (KERNEL.29)
 805  */
 806 void WINAPI Yield16(void)
 807 {
 808     TDB *pCurTask = TASK_GetCurrent();
 809
 810     if (pCurTask && pCurTask->hQueue)
 811     {
 812         HMODULE mod = GetModuleHandleA( "user32.dll" );
 813         if (mod)
 814         {
 815             BOOL (WINAPI *pPeekMessageW)( MSG *msg, HWND hwnd, UINT first, UINT last, UINT flags );
 816             pPeekMessageW = (void *)GetProcAddress( mod, "PeekMessageW" );
 817             if (pPeekMessageW)
 818             {
 819                 MSG msg;
 820                 pPeekMessageW( &msg, 0, 0, 0, PM_REMOVE | PM_QS_SENDMESSAGE );
 821                 return;
 822             }
 823         }
 824     }
 825     OldYield16();
 826 }
 827
 828 /***********************************************************************
 829  *           KERNEL_490  (KERNEL.490)
 830  */
 831 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 832 {
 833     if ( !someTask ) return 0;
 834
 835     FIXME("(%04x): stub\n", someTask );
 836     return 0;
 837 }
 838
 839 /***********************************************************************
 840  *           MakeProcInstance  (KERNEL.51)
 841  */
 842 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 843 {
 844     struct thunk *thunk;
 845     BYTE *lfunc;
 846     SEGPTR thunkaddr;
 847     WORD hInstanceSelector;
 848
 849     hInstanceSelector = GlobalHandleToSel16(hInstance);
 850
 851     TRACE("(%p, %04x);\n", func, hInstance);
 852
 853     if (!HIWORD(func)) {
 854       /* Win95 actually protects via SEH, but this is better for debugging */
 855       WARN("Ouch ! Called with invalid func %p !\n", func);
 856       return NULL;
 857     }
 858
 859     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 860       && (hInstance != 0)
 861       && (hInstance != 0xffff) )
 862     {
 863         /* calling MPI with a foreign DSEG is invalid ! */
 864         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 865                    hInstance,CURRENT_DS);
 866     }
 867
 868     /* Always use the DSEG that MPI was entered with.
 869      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 870      * as CURRENT_DS provides the DSEG value we need.
 871      * ("calling" DS, *not* "task" DS !) */
 872     hInstanceSelector = CURRENT_DS;
 873     hInstance = GlobalHandle16(hInstanceSelector);
 874
 875     /* no thunking for DLLs */
 876     if (NE_GetPtr(FarGetOwner16(hInstance))->ne_flags & NE_FFLAGS_LIBMODULE)
 877         return func;
 878
 879     thunkaddr = TASK_AllocThunk();
 880     if (!thunkaddr) return NULL;
 881     thunk = MapSL( thunkaddr );
 882     lfunc = MapSL( (SEGPTR)func );
 883
 884     TRACE("(%p,%04x): got thunk %08x\n", func, hInstance, thunkaddr );
 885     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 886         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 887     ) {
 888         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 889     }
 890
 891     thunk->movw     = 0xb8;    /* movw instance, %ax */
 892     thunk->instance = hInstanceSelector;
 893     thunk->ljmp     = 0xea;    /* ljmp func */
 894     thunk->func     = func;
 895     return (FARPROC16)thunkaddr;
 896     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 897 }
 898
 899
 900 /***********************************************************************
 901  *           FreeProcInstance  (KERNEL.52)
 902  */
 903 void WINAPI FreeProcInstance16( FARPROC16 func )
 904 {
 905     TRACE("(%p)\n", func );
 906     TASK_FreeThunk( (SEGPTR)func );
 907 }
 908
 909 /**********************************************************************
 910  *          TASK_GetCodeSegment
 911  *
 912  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 913  * and logical segment number of a given code segment.
 914  *
 915  * 'proc' either *is* already a pair of module handle and segment number,
 916  * in which case there's nothing to do.  Otherwise, it is a pointer to
 917  * a function, and we need to retrieve the code segment.  If the pointer
 918  * happens to point to a thunk, we'll retrieve info about the code segment
 919  * where the function pointed to by the thunk resides, not the thunk itself.
 920  *
 921  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 922  *        the function the snoop code will return to ...
 923  *
 924  */
 925 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 926                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 927 {
 928     NE_MODULE *pModule = NULL;
 929     SEGTABLEENTRY *pSeg = NULL;
 930     int segNr=0;
 931
 932     /* Try pair of module handle / segment number */
 933     pModule = GlobalLock16( HIWORD( proc ) );
 934     if ( pModule && pModule->ne_magic == IMAGE_OS2_SIGNATURE )
 935     {
 936         segNr = LOWORD( proc );
 937         if ( segNr && segNr <= pModule->ne_cseg )
 938             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 939     }
 940
 941     /* Try thunk or function */
 942     else
 943     {
 944         BYTE *thunk = MapSL( (SEGPTR)proc );
 945         WORD selector;
 946
 947         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 948             selector = thunk[6] + (thunk[7] << 8);
 949         else
 950             selector = HIWORD( proc );
 951
 952         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 953         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 954
 955         if ( pModule )
 956             for ( segNr = 1; segNr <= pModule->ne_cseg; segNr++, pSeg++ )
 957                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 958                     break;
 959
 960         if ( pModule && segNr > pModule->ne_cseg )
 961             pSeg = NULL;
 962     }
 963
 964     /* Abort if segment not found */
 965
 966     if ( !pModule || !pSeg )
 967         return FALSE;
 968
 969     /* Return segment data */
 970
 971     if ( ppModule ) *ppModule = pModule;
 972     if ( ppSeg    ) *ppSeg    = pSeg;
 973     if ( pSegNr   ) *pSegNr   = segNr;
 974
 975     return TRUE;
 976 }
 977
 978 /**********************************************************************
 979  *          GetCodeHandle    (KERNEL.93)
 980  */
 981 DWORD WINAPI GetCodeHandle16( FARPROC16 proc )
 982 {
 983     SEGTABLEENTRY *pSeg;
 984
 985     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 986         return 0;
 987
 988     return MAKELONG( pSeg->hSeg, GlobalHandleToSel16(pSeg->hSeg) );
 989 }
 990
 991 /**********************************************************************
 992  *          GetCodeInfo    (KERNEL.104)
 993  */
 994 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 995 {
 996     NE_MODULE *pModule;
 997     SEGTABLEENTRY *pSeg;
 998     int segNr;
 999
1000     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
1001         return FALSE;
1002
1003     /* Fill in segment information */
1004
1005     segInfo->offSegment = pSeg->filepos;
1006     segInfo->cbSegment  = pSeg->size;
1007     segInfo->flags      = pSeg->flags;
1008     segInfo->cbAlloc    = pSeg->minsize;
1009     segInfo->h          = pSeg->hSeg;
1010     segInfo->alignShift = pModule->ne_align;
1011
1012     if ( segNr == pModule->ne_autodata )
1013         segInfo->cbAlloc += pModule->ne_heap + pModule->ne_stack;
1014
1015     /* Return module handle in %es */
1016
1017     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1018
1019     return TRUE;
1020 }
1021
1022
1023 /**********************************************************************
1024  *          DefineHandleTable    (KERNEL.94)
1025  */
1026 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1027 {
1028     FIXME("(%04x): stub ?\n", wOffset);
1029     return TRUE;
1030 }
1031
1032
1033 /***********************************************************************
1034  *           SetTaskQueue  (KERNEL.34)
1035  */
1036 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1037 {
1038     FIXME( "stub, should not get called\n" );
1039     return 0xbeef;
1040 }
1041
1042
1043 /***********************************************************************
1044  *           GetTaskQueue  (KERNEL.35)
1045  */
1046 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1047 {
1048     FIXME( "stub, should not get called\n" );
1049     return 0xbeef;
1050 }
1051
1052 /***********************************************************************
1053  *           SetThreadQueue  (KERNEL.463)
1054  */
1055 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1056 {
1057     FIXME( "stub, should not get called\n" );
1058     return 0xbeef;
1059 }
1060
1061 /***********************************************************************
1062  *           GetThreadQueue  (KERNEL.464)
1063  */
1064 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1065 {
1066     FIXME( "stub, should not get called\n" );
1067     return 0xbeef;
1068 }
1069
1070 /***********************************************************************
1071  *           SetFastQueue  (KERNEL.624)
1072  */
1073 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1074 {
1075     FIXME( "stub, should not get called\n" );
1076 }
1077
1078 /***********************************************************************
1079  *           GetFastQueue  (KERNEL.625)
1080  */
1081 HQUEUE16 WINAPI GetFastQueue16( void )
1082 {
1083     FIXME( "stub, should not get called\n" );
1084     return 0xbeef;
1085 }
1086
1087 /***********************************************************************
1088  *           SwitchStackTo   (KERNEL.108)
1089  */
1090 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1091 {
1092     STACK16FRAME *oldFrame, *newFrame;
1093     INSTANCEDATA *pData;
1094     UINT16 copySize;
1095
1096     if (!(pData = GlobalLock16( seg ))) return;
1097     TRACE( "old=%04x:%04x new=%04x:%04x\n", CURRENT_SS, CURRENT_SP, seg, ptr );
1098
1099     /* Save the old stack */
1100
1101     oldFrame = CURRENT_STACK16;
1102     /* pop frame + args and push bp */
1103     pData->old_ss = CURRENT_SS;
1104     pData->old_sp = CURRENT_SP + sizeof(STACK16FRAME) + 2 * sizeof(WORD);
1105     *(WORD *)MapSL(MAKESEGPTR(pData->old_ss, pData->old_sp)) = oldFrame->bp;
1106     pData->stacktop    = top;
1107     pData->stackmin    = ptr;
1108     pData->stackbottom = ptr;
1109
1110     /* Switch to the new stack */
1111
1112     /* Note: we need to take the 3 arguments into account; otherwise,
1113      * the stack will underflow upon return from this function.
1114      */
1115     copySize = oldFrame->bp - pData->old_sp;
1116     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1117     CURRENT_SS = seg;
1118     CURRENT_SP = ptr - copySize;
1119     newFrame = CURRENT_STACK16;
1120
1121     /* Copy the stack frame and the local variables to the new stack */
1122
1123     memmove( newFrame, oldFrame, copySize );
1124     newFrame->bp = ptr;
1125     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1126 }
1127
1128
1129 /***********************************************************************
1130  *           SwitchStackBack   (KERNEL.109)
1131  */
1132 void WINAPI SwitchStackBack16( CONTEXT *context )
1133 {
1134     STACK16FRAME *oldFrame, *newFrame;
1135     INSTANCEDATA *pData;
1136
1137     if (!(pData = GlobalLock16(CURRENT_SS)))
1138         return;
1139     if (!pData->old_ss)
1140     {
1141         WARN("No previous SwitchStackTo\n" );
1142         return;
1143     }
1144     TRACE( "restoring stack %04x:%04x\n", pData->old_ss, pData->old_sp );
1145
1146     oldFrame = CURRENT_STACK16;
1147
1148     /* Pop bp from the previous stack */
1149
1150     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(MAKESEGPTR(pData->old_ss, pData->old_sp));
1151     pData->old_sp += sizeof(WORD);
1152
1153     /* Switch back to the old stack */
1154
1155     CURRENT_SS = pData->old_ss;
1156     CURRENT_SP = pData->old_sp - sizeof(STACK16FRAME);
1157     context->SegSs = pData->old_ss;
1158     context->Esp   = pData->old_sp - sizeof(DWORD); /*ret addr*/
1159     pData->old_ss = pData->old_sp = 0;
1160
1161     /* Build a stack frame for the return */
1162
1163     newFrame = CURRENT_STACK16;
1164     newFrame->frame32     = oldFrame->frame32;
1165     newFrame->module_cs   = oldFrame->module_cs;
1166     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1167     newFrame->entry_ip    = oldFrame->entry_ip;
1168 }
1169
1170
1171 /***********************************************************************
1172  *           GetTaskQueueDS  (KERNEL.118)
1173  */
1174 void WINAPI GetTaskQueueDS16(void)
1175 {
1176     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1177 }
1178
1179
1180 /***********************************************************************
1181  *           GetTaskQueueES  (KERNEL.119)
1182  */
1183 void WINAPI GetTaskQueueES16(void)
1184 {
1185     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1186 }
1187
1188
1189 /***********************************************************************
1190  *           GetCurrentTask   (KERNEL32.@)
1191  */
1192 HTASK16 WINAPI GetCurrentTask(void)
1193 {
1194     HTASK16 ret = kernel_get_thread_data()->htask16;
1195     if (!ret) ret = main_task;
1196     return ret;
1197 }
1198
1199 /***********************************************************************
1200  *           GetCurrentTask   (KERNEL.36)
1201  */
1202 DWORD WINAPI WIN16_GetCurrentTask(void)
1203 {
1204     /* This is the version used by relay code; the first task is */
1205     /* returned in the high word of the result */
1206     return MAKELONG( GetCurrentTask(), hFirstTask );
1207 }
1208
1209
1210 /***********************************************************************
1211  *           GetCurrentPDB   (KERNEL.37)
1212  *
1213  * UNDOC: returns PSP of KERNEL in high word
1214  */
1215 DWORD WINAPI GetCurrentPDB16(void)
1216 {
1217     TDB *pTask;
1218
1219     if (!(pTask = TASK_GetCurrent())) return 0;
1220     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1221 }
1222
1223
1224 /***********************************************************************
1225  *           GetCurPID   (KERNEL.157)
1226  */
1227 DWORD WINAPI GetCurPID16( DWORD unused )
1228 {
1229     return 0;
1230 }
1231
1232
1233 /***********************************************************************
1234  *           GetInstanceData   (KERNEL.54)
1235  */
1236 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1237 {
1238     char *ptr = GlobalLock16( instance );
1239     if (!ptr || !len) return 0;
1240     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1241     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1242     return len;
1243 }
1244
1245
1246 /***********************************************************************
1247  *           GetExeVersion   (KERNEL.105)
1248  */
1249 WORD WINAPI GetExeVersion16(void)
1250 {
1251     TDB *pTask;
1252
1253     if (!(pTask = TASK_GetCurrent())) return 0;
1254     return pTask->version;
1255 }
1256
1257
1258 /***********************************************************************
1259  *           SetErrorMode   (KERNEL.107)
1260  */
1261 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1262 {
1263     TDB *pTask;
1264     if (!(pTask = TASK_GetCurrent())) return 0;
1265     pTask->error_mode = mode;
1266     return SetErrorMode( mode );
1267 }
1268
1269
1270 /***********************************************************************
1271  *           GetNumTasks   (KERNEL.152)
1272  */
1273 UINT16 WINAPI GetNumTasks16(void)
1274 {
1275     return nTaskCount;
1276 }
1277
1278
1279 /***********************************************************************
1280  *           GetTaskDS   (KERNEL.155)
1281  *
1282  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1283  * I don't think we need to bother with this.
1284  */
1285 HINSTANCE16 WINAPI GetTaskDS16(void)
1286 {
1287     TDB *pTask;
1288
1289     if (!(pTask = TASK_GetCurrent())) return 0;
1290     return GlobalHandleToSel16(pTask->hInstance);
1291 }
1292
1293 /***********************************************************************
1294  *           GetDummyModuleHandleDS   (KERNEL.602)
1295  */
1296 WORD WINAPI GetDummyModuleHandleDS16(void)
1297 {
1298     TDB *pTask;
1299     WORD selector;
1300
1301     if (!(pTask = TASK_GetCurrent())) return 0;
1302     if (!(pTask->flags & TDBF_WIN32)) return 0;
1303     selector = GlobalHandleToSel16( pTask->hModule );
1304     CURRENT_DS = selector;
1305     return selector;
1306 }
1307
1308 /***********************************************************************
1309  *           IsTask   (KERNEL.320)
1310  */
1311 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1312 {
1313     TDB *pTask;
1314
1315     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1316     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1317     return (pTask->magic == TDB_MAGIC);
1318 }
1319
1320
1321 /***********************************************************************
1322  *           IsWinOldApTask   (KERNEL.158)
1323  */
1324 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1325 {
1326     /* should return bit 0 of byte 0x48 in PSP */
1327     return FALSE;
1328 }
1329
1330 /***********************************************************************
1331  *           SetTaskSignalProc   (KERNEL.38)
1332  */
1333 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1334 {
1335     TDB *pTask;
1336     FARPROC16 oldProc;
1337
1338     if (!hTask) hTask = GetCurrentTask();
1339     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1340     oldProc = pTask->userhandler;
1341     pTask->userhandler = proc;
1342     return oldProc;
1343 }
1344
1345 /***********************************************************************
1346  *           SetSigHandler   (KERNEL.140)
1347  */
1348 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1349                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1350 {
1351     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1352           newhandler,oldhandler,oldmode,newmode,flag );
1353
1354     if (flag != 1) return 0;
1355     if (!newmode) newhandler = NULL;  /* Default handler */
1356     if (newmode != 4)
1357     {
1358         TDB *pTask;
1359
1360         if (!(pTask = TASK_GetCurrent())) return 0;
1361         if (oldmode) *oldmode = pTask->signal_flags;
1362         pTask->signal_flags = newmode;
1363         if (oldhandler) *oldhandler = pTask->sighandler;
1364         pTask->sighandler = newhandler;
1365     }
1366     return 0;
1367 }
1368
1369
1370 /***********************************************************************
1371  *           GlobalNotify   (KERNEL.154)
1372  *
1373  * Note that GlobalNotify does _not_ return the old NotifyProc
1374  * -- contrary to LocalNotify !!
1375  */
1376 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1377 {
1378     TDB *pTask;
1379
1380     if (!(pTask = TASK_GetCurrent())) return;
1381     pTask->discardhandler = proc;
1382 }
1383
1384
1385 /***********************************************************************
1386  *           GetExePtrHelper
1387  */
1388 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1389 {
1390     char *ptr;
1391     HANDLE16 owner;
1392
1393       /* Check for module handle */
1394
1395     if (!(ptr = GlobalLock16( handle ))) return 0;
1396     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return handle;
1397
1398       /* Search for this handle inside all tasks */
1399
1400     *hTask = hFirstTask;
1401     while (*hTask)
1402     {
1403         TDB *pTask = TASK_GetPtr( *hTask );
1404         if ((*hTask == handle) ||
1405             (pTask->hInstance == handle) ||
1406             (pTask->hQueue == handle) ||
1407             (pTask->hPDB == handle)) return pTask->hModule;
1408         *hTask = pTask->hNext;
1409     }
1410
1411       /* Check the owner for module handle */
1412
1413     owner = FarGetOwner16( handle );
1414     if (!(ptr = GlobalLock16( owner ))) return 0;
1415     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return owner;
1416
1417       /* Search for the owner inside all tasks */
1418
1419     *hTask = hFirstTask;
1420     while (*hTask)
1421     {
1422         TDB *pTask = TASK_GetPtr( *hTask );
1423         if ((*hTask == owner) ||
1424             (pTask->hInstance == owner) ||
1425             (pTask->hQueue == owner) ||
1426             (pTask->hPDB == owner)) return pTask->hModule;
1427         *hTask = pTask->hNext;
1428     }
1429
1430     return 0;
1431 }
1432
1433 /***********************************************************************
1434  *           GetExePtr   (KERNEL.133)
1435  */
1436 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1437 {
1438     HTASK16 hTask = 0;
1439     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1440     STACK16FRAME *frame = CURRENT_STACK16;
1441     frame->ecx = hModule;
1442     if (hTask) frame->es = hTask;
1443     return hModule;
1444 }
1445
1446
1447 /***********************************************************************
1448  *           K228   (KERNEL.228)
1449  */
1450 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1451 {
1452     HTASK16 hTask = 0;
1453     return GetExePtrHelper( handle, &hTask );
1454 }
1455
1456
1457 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1458
1459 /**************************************************************************
1460  *           FatalAppExit   (KERNEL.137)
1461  */
1462 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1463 {
1464     TDB *pTask = TASK_GetCurrent();
1465
1466     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1467     {
1468         HMODULE mod = GetModuleHandleA( "user32.dll" );
1469         if (mod)
1470         {
1471             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1472             if (pMessageBoxA)
1473             {
1474                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1475                 goto done;
1476             }
1477         }
1478         ERR( "%s\n", debugstr_a(str) );
1479     }
1480  done:
1481     ExitThread(0xff);
1482 }
1483
1484
1485 /***********************************************************************
1486  *           GetAppCompatFlags   (KERNEL.354)
1487  */
1488 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1489 {
1490     TDB *pTask;
1491
1492     if (!hTask) hTask = GetCurrentTask();
1493     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1494     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1495     return pTask->compat_flags;
1496 }
1497
1498
1499 /***********************************************************************
1500  *           GetDOSEnvironment     (KERNEL.131)
1501  *
1502  * Note: the environment is allocated once, it doesn't track changes
1503  * made using the Win32 API. This shouldn't matter.
1504  *
1505  * Format of a 16-bit environment block:
1506  * ASCIIZ   string 1 (xx=yy format)
1507  * ...
1508  * ASCIIZ   string n
1509  * BYTE     0
1510  * WORD     1
1511  * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1512  */
1513 SEGPTR WINAPI GetDOSEnvironment16(void)
1514 {
1515     static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1516     static HGLOBAL16 handle;  /* handle to the 16 bit environment */
1517
1518     if (!handle)
1519     {
1520         DWORD size;
1521         LPSTR p, env;
1522
1523         p = env = GetEnvironmentStringsA();
1524         while (*p) p += strlen(p) + 1;
1525         p++;  /* skip last null */
1526         size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1527         handle = GlobalAlloc16( GMEM_FIXED, size );
1528         if (handle)
1529         {
1530             WORD one = 1;
1531             LPSTR env16 = GlobalLock16( handle );
1532             memcpy( env16, env, p - env );
1533             memcpy( env16 + (p - env), &one, sizeof(one));
1534             memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1535             GlobalUnlock16( handle );
1536         }
1537         FreeEnvironmentStringsA( env );
1538     }
1539     return WOWGlobalLock16( handle );
1540 }