dlls/kernel32/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <assert.h>
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif
  31
  32 #include "windef.h"
  33 #include "winbase.h"
  34 #include "wingdi.h"
  35 #include "winnt.h"
  36 #include "wownt32.h"
  37 #include "winuser.h"
  38
  39 #include "wine/winbase16.h"
  40 #include "winternl.h"
  41 #include "kernel_private.h"
  42 #include "kernel16_private.h"
  43
  44 #include "wine/debug.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(task);
  47
  48 #include "pshpack1.h"
  49
  50 struct thunk
  51 {
  52     BYTE      movw;
  53     HANDLE16  instance;
  54     BYTE      ljmp;
  55     FARPROC16 func;
  56 };
  57
  58 /* Segment containing MakeProcInstance() thunks */
  59 typedef struct
  60 {
  61     WORD  next;       /* Selector of next segment */
  62     WORD  magic;      /* Thunks signature */
  63     WORD  unused;
  64     WORD  free;       /* Head of the free list */
  65     struct thunk thunks[1];
  66 } THUNKS;
  67
  68 #include "poppack.h"
  69
  70 #define THUNK_MAGIC  ('P' | ('T' << 8))
  71
  72   /* Min. number of thunks allocated when creating a new segment */
  73 #define MIN_THUNKS  32
  74
  75 #define TDB_MAGIC    ('T' | ('D' << 8))
  76
  77 static THHOOK DefaultThhook;
  78 THHOOK *pThhook = &DefaultThhook;
  79
  80 #define hFirstTask   (pThhook->HeadTDB)
  81 #define hLockedTask  (pThhook->LockTDB)
  82
  83 static UINT16 nTaskCount = 0;
  84
  85 static HTASK16 initial_task, main_task;
  86
  87 /***********************************************************************
  88  *           TASK_InstallTHHook
  89  */
  90 void TASK_InstallTHHook( THHOOK *pNewThhook )
  91 {
  92      THHOOK *pOldThhook = pThhook;
  93
  94      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  95
  96      *pThhook = *pOldThhook;
  97 }
  98
  99 /***********************************************************************
 100  *           TASK_GetPtr
 101  */
 102 static TDB *TASK_GetPtr( HTASK16 hTask )
 103 {
 104     return GlobalLock16( hTask );
 105 }
 106
 107
 108 /***********************************************************************
 109  *           TASK_GetCurrent
 110  */
 111 TDB *TASK_GetCurrent(void)
 112 {
 113     return TASK_GetPtr( GetCurrentTask() );
 114 }
 115
 116
 117 /***********************************************************************
 118  *           TASK_LinkTask
 119  */
 120 static void TASK_LinkTask( HTASK16 hTask )
 121 {
 122     HTASK16 *prevTask;
 123     TDB *pTask;
 124
 125     if (!(pTask = TASK_GetPtr( hTask ))) return;
 126     prevTask = &hFirstTask;
 127     while (*prevTask)
 128     {
 129         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 130         if (prevTaskPtr->priority >= pTask->priority) break;
 131         prevTask = &prevTaskPtr->hNext;
 132     }
 133     pTask->hNext = *prevTask;
 134     *prevTask = hTask;
 135     nTaskCount++;
 136 }
 137
 138
 139 /***********************************************************************
 140  *           TASK_UnlinkTask
 141  */
 142 static void TASK_UnlinkTask( HTASK16 hTask )
 143 {
 144     HTASK16 *prevTask;
 145     TDB *pTask;
 146
 147     prevTask = &hFirstTask;
 148     while (*prevTask && (*prevTask != hTask))
 149     {
 150         pTask = TASK_GetPtr( *prevTask );
 151         prevTask = &pTask->hNext;
 152     }
 153     if (*prevTask)
 154     {
 155         pTask = TASK_GetPtr( *prevTask );
 156         *prevTask = pTask->hNext;
 157         pTask->hNext = 0;
 158         nTaskCount--;
 159     }
 160 }
 161
 162
 163 /***********************************************************************
 164  *           TASK_CreateThunks
 165  *
 166  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 167  * and containing 'count' entries.
 168  */
 169 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 170 {
 171     int i;
 172     THUNKS *pThunk;
 173
 174     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 175     pThunk->next = 0;
 176     pThunk->magic = THUNK_MAGIC;
 177     pThunk->free = FIELD_OFFSET( THUNKS, thunks );
 178     for (i = 0; i < count-1; i++)
 179         *(WORD *)&pThunk->thunks[i] = FIELD_OFFSET( THUNKS, thunks[i+1] );
 180     *(WORD *)&pThunk->thunks[i] = 0;  /* Last thunk */
 181 }
 182
 183
 184 /***********************************************************************
 185  *           TASK_AllocThunk
 186  *
 187  * Allocate a thunk for MakeProcInstance().
 188  */
 189 static SEGPTR TASK_AllocThunk(void)
 190 {
 191     TDB *pTask;
 192     THUNKS *pThunk;
 193     WORD sel, base;
 194
 195     if (!(pTask = TASK_GetCurrent())) return 0;
 196     sel = pTask->hCSAlias;
 197     pThunk = (THUNKS *)pTask->thunks;
 198     base = (char *)pThunk - (char *)pTask;
 199     while (!pThunk->free)
 200     {
 201         sel = pThunk->next;
 202         if (!sel)  /* Allocate a new segment */
 203         {
 204             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 205                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 206             if (!sel) return 0;
 207             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 208             pThunk->next = sel;
 209         }
 210         pThunk = GlobalLock16( sel );
 211         base = 0;
 212     }
 213     base += pThunk->free;
 214     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 215     return MAKESEGPTR( sel, base );
 216 }
 217
 218
 219 /***********************************************************************
 220  *           TASK_FreeThunk
 221  *
 222  * Free a MakeProcInstance() thunk.
 223  */
 224 static BOOL TASK_FreeThunk( SEGPTR thunk )
 225 {
 226     TDB *pTask;
 227     THUNKS *pThunk;
 228     WORD sel, base;
 229
 230     if (!(pTask = TASK_GetCurrent())) return 0;
 231     sel = pTask->hCSAlias;
 232     pThunk = (THUNKS *)pTask->thunks;
 233     base = (char *)pThunk - (char *)pTask;
 234     while (sel && (sel != HIWORD(thunk)))
 235     {
 236         sel = pThunk->next;
 237         pThunk = GlobalLock16( sel );
 238         base = 0;
 239     }
 240     if (!sel) return FALSE;
 241     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 242     pThunk->free = LOWORD(thunk) - base;
 243     return TRUE;
 244 }
 245
 246
 247 /***********************************************************************
 248  *           TASK_Create
 249  *
 250  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 251  *       to be careful to protect global data structures. We do this
 252  *       by entering the Win16Lock while linking the task into the
 253  *       global task list.
 254  */
 255 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
 256 {
 257     HTASK16 hTask;
 258     TDB *pTask;
 259     FARPROC16 proc;
 260     char curdir[MAX_PATH];
 261     HMODULE16 hModule = pModule ? pModule->self : 0;
 262
 263       /* Allocate the task structure */
 264
 265     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 266     if (!hTask) return NULL;
 267     pTask = TASK_GetPtr( hTask );
 268     FarSetOwner16( hTask, hModule );
 269
 270     /* Fill the task structure */
 271
 272     pTask->hSelf = hTask;
 273
 274     pTask->version       = pModule ? pModule->ne_expver : 0x0400;
 275     pTask->hModule       = hModule;
 276     pTask->hParent       = GetCurrentTask();
 277     pTask->magic         = TDB_MAGIC;
 278     pTask->nCmdShow      = cmdShow;
 279
 280     GetCurrentDirectoryA( sizeof(curdir), curdir );
 281     GetShortPathNameA( curdir, curdir, sizeof(curdir) );
 282     pTask->curdrive = (curdir[0] - 'A') | 0x80;
 283     lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
 284
 285       /* Create the thunks block */
 286
 287     TASK_CreateThunks( hTask, (char *)pTask->thunks - (char *)pTask, 7 );
 288
 289       /* Copy the module name */
 290
 291     if (hModule)
 292     {
 293         char name[sizeof(pTask->module_name)+1];
 294         size_t len;
 295         GetModuleName16( hModule, name, sizeof(name) );
 296         len = strlen(name) + 1;
 297         memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
 298         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 299     }
 300
 301       /* Allocate a selector for the PDB */
 302
 303     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 304                                       hModule, WINE_LDT_FLAGS_DATA );
 305
 306       /* Fill the PDB */
 307
 308     pTask->pdb.int20 = 0x20cd;
 309     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 310     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 311     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 312     pTask->pdb.savedint22 = 0;
 313     pTask->pdb.savedint23 = 0;
 314     pTask->pdb.savedint24 = 0;
 315     pTask->pdb.fileHandlesPtr =
 316         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), FIELD_OFFSET( PDB16, fileHandles ));
 317     pTask->pdb.hFileHandles = 0;
 318     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 319     /* FIXME: should we make a copy of the environment? */
 320     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 321     pTask->pdb.nbFiles        = 20;
 322
 323     /* Fill the command line */
 324
 325     if (!cmdline)
 326     {
 327         cmdline = GetCommandLineA();
 328         /* remove the first word (program name) */
 329         if (*cmdline == '"')
 330             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 331         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 332         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 333         len = strlen(cmdline);
 334     }
 335     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 336     pTask->pdb.cmdLine[0] = len;
 337     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 338     /* pTask->pdb.cmdLine[len+1] = 0; */
 339
 340     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 341
 342       /* Allocate a code segment alias for the TDB */
 343
 344     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, pTask, sizeof(TDB),
 345                                           pTask->hPDB, WINE_LDT_FLAGS_CODE );
 346
 347       /* Default DTA overwrites command line */
 348
 349     pTask->dta = MAKESEGPTR( pTask->hPDB, FIELD_OFFSET( PDB16, cmdLine ));
 350
 351     /* Create scheduler event for 16-bit tasks */
 352
 353     if ( !(pTask->flags & TDBF_WIN32) )
 354         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 355
 356     if (!initial_task) initial_task = hTask;
 357
 358     return pTask;
 359 }
 360
 361
 362 /***********************************************************************
 363  *           TASK_DeleteTask
 364  */
 365 static void TASK_DeleteTask( HTASK16 hTask )
 366 {
 367     TDB *pTask;
 368     HGLOBAL16 hPDB;
 369
 370     if (!(pTask = TASK_GetPtr( hTask ))) return;
 371     hPDB = pTask->hPDB;
 372
 373     pTask->magic = 0xdead; /* invalidate signature */
 374
 375     /* Free the selector aliases */
 376
 377     GLOBAL_FreeBlock( pTask->hCSAlias );
 378     GLOBAL_FreeBlock( pTask->hPDB );
 379
 380     /* Free the task module */
 381
 382     FreeModule16( pTask->hModule );
 383
 384     /* Free the task structure itself */
 385
 386     GlobalFree16( hTask );
 387
 388     /* Free all memory used by this task (including the 32-bit stack, */
 389     /* the environment block and the thunk segments). */
 390
 391     GlobalFreeAll16( hPDB );
 392 }
 393
 394
 395 /***********************************************************************
 396  *           TASK_CreateMainTask
 397  *
 398  * Create a task for the main (32-bit) process.
 399  */
 400 void TASK_CreateMainTask(void)
 401 {
 402     TDB *pTask;
 403     STARTUPINFOA startup_info;
 404     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 405
 406     GetStartupInfoA( &startup_info );
 407     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 408     pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
 409     if (!pTask)
 410     {
 411         ERR("could not create task for main process\n");
 412         ExitProcess(1);
 413     }
 414
 415     pTask->flags        |= TDBF_WIN32;
 416     pTask->hInstance     = 0;
 417     pTask->hPrevInstance = 0;
 418     pTask->teb           = NtCurrentTeb();
 419
 420     /* Add the task to the linked list */
 421     /* (no need to get the win16 lock, we are the only thread at this point) */
 422     TASK_LinkTask( pTask->hSelf );
 423     main_task = pTask->hSelf;
 424 }
 425
 426
 427 struct create_data
 428 {
 429     TDB                 *task;
 430     WIN16_SUBSYSTEM_TIB *tib;
 431 };
 432
 433 /* allocate the win16 TIB for a new 16-bit task */
 434 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
 435 {
 436     WCHAR path[MAX_PATH];
 437     WIN16_SUBSYSTEM_TIB *tib;
 438     UNICODE_STRING *curdir;
 439     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 440
 441     if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
 442     MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 443     GetLongPathNameW( path, path, MAX_PATH );
 444     if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
 445     else tib->exe_name = NULL;
 446
 447     RtlAcquirePebLock();
 448     if (NtCurrentTeb()->Tib.SubSystemTib)
 449         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 450     else
 451         curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 452     tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
 453     tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
 454     tib->curdir.DosPath.Buffer = tib->curdir_buffer;
 455     tib->curdir.Handle = 0;
 456     memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
 457     tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
 458     RtlReleasePebLock();
 459     return tib;
 460 }
 461
 462 static inline void free_win16_tib( WIN16_SUBSYSTEM_TIB *tib )
 463 {
 464     if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
 465     HeapFree( GetProcessHeap(), 0, tib );
 466 }
 467
 468 /* startup routine for a new 16-bit thread */
 469 static DWORD CALLBACK task_start( LPVOID p )
 470 {
 471     struct create_data *data = p;
 472     TDB *pTask = data->task;
 473     DWORD ret;
 474
 475     kernel_get_thread_data()->htask16 = pTask->hSelf;
 476     NtCurrentTeb()->Tib.SubSystemTib = data->tib;
 477     HeapFree( GetProcessHeap(), 0, data );
 478
 479     _EnterWin16Lock();
 480     TASK_LinkTask( pTask->hSelf );
 481     pTask->teb = NtCurrentTeb();
 482     ret = NE_StartTask();
 483     _LeaveWin16Lock();
 484     return ret;
 485 }
 486
 487
 488 /***********************************************************************
 489  *           TASK_SpawnTask
 490  *
 491  * Spawn a new 16-bit task.
 492  */
 493 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 494                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 495 {
 496     struct create_data *data = NULL;
 497     WIN16_SUBSYSTEM_TIB *tib;
 498     TDB *pTask;
 499
 500     if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
 501     if (!(tib = allocate_win16_tib( pTask ))) goto failed;
 502     if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data)))) goto failed;
 503     data->task = pTask;
 504     data->tib = tib;
 505     if (!(*hThread = CreateThread( NULL, 0, task_start, data, 0, NULL ))) goto failed;
 506     return pTask->hSelf;
 507
 508 failed:
 509     if (tib) free_win16_tib( tib );
 510     HeapFree( GetProcessHeap(), 0, data );
 511     TASK_DeleteTask( pTask->hSelf );
 512     return 0;
 513 }
 514
 515
 516 /***********************************************************************
 517  *           TASK_GetTaskFromThread
 518  */
 519 HTASK16 TASK_GetTaskFromThread( DWORD thread )
 520 {
 521     TDB *p = TASK_GetPtr( hFirstTask );
 522     while (p)
 523     {
 524         if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
 525         p = TASK_GetPtr( p->hNext );
 526     }
 527     return 0;
 528 }
 529
 530
 531 /***********************************************************************
 532  *           TASK_CallTaskSignalProc
 533  */
 534 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
 535 {
 536     WORD args[5];
 537     TDB *pTask = TASK_GetCurrent();
 538
 539     if ( !pTask || !pTask->userhandler ) return;
 540
 541     args[4] = hTaskOrModule;
 542     args[3] = uCode;
 543     args[2] = 0;
 544     args[1] = pTask->hInstance;
 545     args[0] = pTask->hQueue;
 546     WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
 547 }
 548
 549
 550 /***********************************************************************
 551  *           TASK_ExitTask
 552  */
 553 void TASK_ExitTask(void)
 554 {
 555     WIN16_SUBSYSTEM_TIB *tib;
 556     TDB *pTask;
 557     DWORD lockCount;
 558
 559     /* Enter the Win16Lock to protect global data structures */
 560     _EnterWin16Lock();
 561
 562     pTask = TASK_GetCurrent();
 563     if ( !pTask )
 564     {
 565         _LeaveWin16Lock();
 566         return;
 567     }
 568
 569     TRACE("Killing task %04x\n", pTask->hSelf );
 570
 571     /* Perform USER cleanup */
 572
 573     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 574
 575     /* Remove the task from the list to be sure we never switch back to it */
 576     TASK_UnlinkTask( pTask->hSelf );
 577
 578     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 579     {
 580         TRACE("this is the last task, exiting\n" );
 581         ExitKernel16();
 582     }
 583
 584     pTask->nEvents = 0;
 585
 586     if ( hLockedTask == pTask->hSelf )
 587         hLockedTask = 0;
 588
 589     TASK_DeleteTask( pTask->hSelf );
 590
 591     if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
 592     {
 593         free_win16_tib( tib );
 594         NtCurrentTeb()->Tib.SubSystemTib = NULL;
 595     }
 596
 597     /* ... and completely release the Win16Lock, just in case. */
 598     ReleaseThunkLock( &lockCount );
 599 }
 600
 601
 602 /***********************************************************************
 603  *           ExitKernel (KERNEL.2)
 604  *
 605  * Clean-up everything and exit the Wine process.
 606  */
 607 void WINAPI ExitKernel16(void)
 608 {
 609     WriteOutProfiles16();
 610     TerminateProcess( GetCurrentProcess(), 0 );
 611 }
 612
 613
 614 /***********************************************************************
 615  *           InitTask  (KERNEL.91)
 616  *
 617  * Called by the application startup code.
 618  */
 619 void WINAPI InitTask16( CONTEXT86 *context )
 620 {
 621     TDB *pTask;
 622     INSTANCEDATA *pinstance;
 623     SEGPTR ptr;
 624
 625     context->Eax = 0;
 626     if (!(pTask = TASK_GetCurrent())) return;
 627
 628     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 629        as some apps, notably Visual Basic apps, *modify* the heap/stack
 630        size of the instance data segment before calling InitTask() */
 631
 632     /* Initialize the INSTANCEDATA structure */
 633     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 634     pinstance->stackmin    = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + sizeof( STACK16FRAME );
 635     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 636     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 637                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 638
 639     /* Initialize the local heap */
 640     if (LOWORD(context->Ecx))
 641         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 642
 643     /* Initialize implicitly loaded DLLs */
 644     NE_InitializeDLLs( pTask->hModule );
 645     NE_DllProcessAttach( pTask->hModule );
 646
 647     /* Registers on return are:
 648      * ax     1 if OK, 0 on error
 649      * cx     stack limit in bytes
 650      * dx     cmdShow parameter
 651      * si     instance handle of the previous instance
 652      * di     instance handle of the new task
 653      * es:bx  pointer to command line inside PSP
 654      *
 655      * 0 (=%bp) is pushed on the stack
 656      */
 657     ptr = stack16_push( sizeof(WORD) );
 658     *(WORD *)MapSL(ptr) = 0;
 659     context->Esp -= 2;
 660
 661     context->Eax = 1;
 662
 663     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 664     else
 665     {
 666         LPBYTE p = &pTask->pdb.cmdLine[1];
 667         while ((*p == ' ') || (*p == '\t')) p++;
 668         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 669     }
 670     context->Ecx   = pinstance->stacktop;
 671     context->Edx   = pTask->nCmdShow;
 672     context->Esi   = (DWORD)pTask->hPrevInstance;
 673     context->Edi   = (DWORD)pTask->hInstance;
 674     context->SegEs = (WORD)pTask->hPDB;
 675 }
 676
 677
 678 /***********************************************************************
 679  *           WaitEvent  (KERNEL.30)
 680  */
 681 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 682 {
 683     TDB *pTask;
 684
 685     if (!hTask) hTask = GetCurrentTask();
 686     pTask = TASK_GetPtr( hTask );
 687
 688     if (pTask->flags & TDBF_WIN32)
 689     {
 690         FIXME("called for Win32 thread (%04x)!\n", GetCurrentThreadId());
 691         return TRUE;
 692     }
 693
 694     if (pTask->nEvents > 0)
 695     {
 696         pTask->nEvents--;
 697         return FALSE;
 698     }
 699
 700     if (pTask->teb == NtCurrentTeb())
 701     {
 702         DWORD lockCount;
 703
 704         NtResetEvent( pTask->hEvent, NULL );
 705         ReleaseThunkLock( &lockCount );
 706         SYSLEVEL_CheckNotLevel( 1 );
 707         WaitForSingleObject( pTask->hEvent, INFINITE );
 708         RestoreThunkLock( lockCount );
 709         if (pTask->nEvents > 0) pTask->nEvents--;
 710     }
 711     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 712
 713     return TRUE;
 714 }
 715
 716
 717 /***********************************************************************
 718  *           PostEvent  (KERNEL.31)
 719  */
 720 void WINAPI PostEvent16( HTASK16 hTask )
 721 {
 722     TDB *pTask;
 723
 724     if (!hTask) hTask = GetCurrentTask();
 725     if (!(pTask = TASK_GetPtr( hTask ))) return;
 726
 727     if (pTask->flags & TDBF_WIN32)
 728     {
 729         FIXME("called for Win32 thread (%04x)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
 730         return;
 731     }
 732
 733     pTask->nEvents++;
 734
 735     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 736 }
 737
 738
 739 /***********************************************************************
 740  *           SetPriority  (KERNEL.32)
 741  */
 742 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 743 {
 744     TDB *pTask;
 745     INT16 newpriority;
 746
 747     if (!hTask) hTask = GetCurrentTask();
 748     if (!(pTask = TASK_GetPtr( hTask ))) return;
 749     newpriority = pTask->priority + delta;
 750     if (newpriority < -32) newpriority = -32;
 751     else if (newpriority > 15) newpriority = 15;
 752
 753     pTask->priority = newpriority + 1;
 754     TASK_UnlinkTask( pTask->hSelf );
 755     TASK_LinkTask( pTask->hSelf );
 756     pTask->priority--;
 757 }
 758
 759
 760 /***********************************************************************
 761  *           LockCurrentTask  (KERNEL.33)
 762  */
 763 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 764 {
 765     if (bLock) hLockedTask = GetCurrentTask();
 766     else hLockedTask = 0;
 767     return hLockedTask;
 768 }
 769
 770
 771 /***********************************************************************
 772  *           IsTaskLocked  (KERNEL.122)
 773  */
 774 HTASK16 WINAPI IsTaskLocked16(void)
 775 {
 776     return hLockedTask;
 777 }
 778
 779
 780 /***********************************************************************
 781  *           OldYield  (KERNEL.117)
 782  */
 783 void WINAPI OldYield16(void)
 784 {
 785    DWORD count;
 786
 787    ReleaseThunkLock(&count);
 788    RestoreThunkLock(count);
 789 }
 790
 791 /***********************************************************************
 792  *           WIN32_OldYield  (KERNEL.447)
 793  */
 794 void WINAPI WIN32_OldYield16(void)
 795 {
 796    DWORD count;
 797
 798    ReleaseThunkLock(&count);
 799    RestoreThunkLock(count);
 800 }
 801
 802 /***********************************************************************
 803  *           DirectedYield  (KERNEL.150)
 804  */
 805 void WINAPI DirectedYield16( HTASK16 hTask )
 806 {
 807     OldYield16();
 808 }
 809
 810 /***********************************************************************
 811  *           Yield  (KERNEL.29)
 812  */
 813 void WINAPI Yield16(void)
 814 {
 815     TDB *pCurTask = TASK_GetCurrent();
 816
 817     if (pCurTask && pCurTask->hQueue)
 818     {
 819         HMODULE mod = GetModuleHandleA( "user32.dll" );
 820         if (mod)
 821         {
 822             BOOL (WINAPI *pPeekMessageW)( MSG *msg, HWND hwnd, UINT first, UINT last, UINT flags );
 823             pPeekMessageW = (void *)GetProcAddress( mod, "PeekMessageW" );
 824             if (pPeekMessageW)
 825             {
 826                 MSG msg;
 827                 pPeekMessageW( &msg, 0, 0, 0, PM_REMOVE | PM_QS_SENDMESSAGE );
 828                 return;
 829             }
 830         }
 831     }
 832     OldYield16();
 833 }
 834
 835 /***********************************************************************
 836  *           KERNEL_490  (KERNEL.490)
 837  */
 838 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 839 {
 840     if ( !someTask ) return 0;
 841
 842     FIXME("(%04x): stub\n", someTask );
 843     return 0;
 844 }
 845
 846 /***********************************************************************
 847  *           MakeProcInstance  (KERNEL.51)
 848  */
 849 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 850 {
 851     struct thunk *thunk;
 852     BYTE *lfunc;
 853     SEGPTR thunkaddr;
 854     WORD hInstanceSelector;
 855
 856     hInstanceSelector = GlobalHandleToSel16(hInstance);
 857
 858     TRACE("(%p, %04x);\n", func, hInstance);
 859
 860     if (!HIWORD(func)) {
 861       /* Win95 actually protects via SEH, but this is better for debugging */
 862       WARN("Ouch ! Called with invalid func %p !\n", func);
 863       return NULL;
 864     }
 865
 866     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 867       && (hInstance != 0)
 868       && (hInstance != 0xffff) )
 869     {
 870         /* calling MPI with a foreign DSEG is invalid ! */
 871         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 872                    hInstance,CURRENT_DS);
 873     }
 874
 875     /* Always use the DSEG that MPI was entered with.
 876      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 877      * as CURRENT_DS provides the DSEG value we need.
 878      * ("calling" DS, *not* "task" DS !) */
 879     hInstanceSelector = CURRENT_DS;
 880     hInstance = GlobalHandle16(hInstanceSelector);
 881
 882     /* no thunking for DLLs */
 883     if (NE_GetPtr(FarGetOwner16(hInstance))->ne_flags & NE_FFLAGS_LIBMODULE)
 884         return func;
 885
 886     thunkaddr = TASK_AllocThunk();
 887     if (!thunkaddr) return NULL;
 888     thunk = MapSL( thunkaddr );
 889     lfunc = MapSL( (SEGPTR)func );
 890
 891     TRACE("(%p,%04x): got thunk %08x\n", func, hInstance, thunkaddr );
 892     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 893         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 894     ) {
 895         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 896     }
 897
 898     thunk->movw     = 0xb8;    /* movw instance, %ax */
 899     thunk->instance = hInstanceSelector;
 900     thunk->ljmp     = 0xea;    /* ljmp func */
 901     thunk->func     = func;
 902     return (FARPROC16)thunkaddr;
 903     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 904 }
 905
 906
 907 /***********************************************************************
 908  *           FreeProcInstance  (KERNEL.52)
 909  */
 910 void WINAPI FreeProcInstance16( FARPROC16 func )
 911 {
 912     TRACE("(%p)\n", func );
 913     TASK_FreeThunk( (SEGPTR)func );
 914 }
 915
 916 /**********************************************************************
 917  *          TASK_GetCodeSegment
 918  *
 919  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 920  * and logical segment number of a given code segment.
 921  *
 922  * 'proc' either *is* already a pair of module handle and segment number,
 923  * in which case there's nothing to do.  Otherwise, it is a pointer to
 924  * a function, and we need to retrieve the code segment.  If the pointer
 925  * happens to point to a thunk, we'll retrieve info about the code segment
 926  * where the function pointed to by the thunk resides, not the thunk itself.
 927  *
 928  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 929  *        the function the snoop code will return to ...
 930  *
 931  */
 932 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 933                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 934 {
 935     NE_MODULE *pModule = NULL;
 936     SEGTABLEENTRY *pSeg = NULL;
 937     int segNr=0;
 938
 939     /* Try pair of module handle / segment number */
 940     pModule = GlobalLock16( HIWORD( proc ) );
 941     if ( pModule && pModule->ne_magic == IMAGE_OS2_SIGNATURE )
 942     {
 943         segNr = LOWORD( proc );
 944         if ( segNr && segNr <= pModule->ne_cseg )
 945             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 946     }
 947
 948     /* Try thunk or function */
 949     else
 950     {
 951         BYTE *thunk = MapSL( (SEGPTR)proc );
 952         WORD selector;
 953
 954         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 955             selector = thunk[6] + (thunk[7] << 8);
 956         else
 957             selector = HIWORD( proc );
 958
 959         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 960         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 961
 962         if ( pModule )
 963             for ( segNr = 1; segNr <= pModule->ne_cseg; segNr++, pSeg++ )
 964                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 965                     break;
 966
 967         if ( pModule && segNr > pModule->ne_cseg )
 968             pSeg = NULL;
 969     }
 970
 971     /* Abort if segment not found */
 972
 973     if ( !pModule || !pSeg )
 974         return FALSE;
 975
 976     /* Return segment data */
 977
 978     if ( ppModule ) *ppModule = pModule;
 979     if ( ppSeg    ) *ppSeg    = pSeg;
 980     if ( pSegNr   ) *pSegNr   = segNr;
 981
 982     return TRUE;
 983 }
 984
 985 /**********************************************************************
 986  *          GetCodeHandle    (KERNEL.93)
 987  */
 988 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 989 {
 990     SEGTABLEENTRY *pSeg;
 991
 992     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 993         return 0;
 994
 995     return pSeg->hSeg;
 996 }
 997
 998 /**********************************************************************
 999  *          GetCodeInfo    (KERNEL.104)
1000  */
1001 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
1002 {
1003     NE_MODULE *pModule;
1004     SEGTABLEENTRY *pSeg;
1005     int segNr;
1006
1007     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
1008         return FALSE;
1009
1010     /* Fill in segment information */
1011
1012     segInfo->offSegment = pSeg->filepos;
1013     segInfo->cbSegment  = pSeg->size;
1014     segInfo->flags      = pSeg->flags;
1015     segInfo->cbAlloc    = pSeg->minsize;
1016     segInfo->h          = pSeg->hSeg;
1017     segInfo->alignShift = pModule->ne_align;
1018
1019     if ( segNr == pModule->ne_autodata )
1020         segInfo->cbAlloc += pModule->ne_heap + pModule->ne_stack;
1021
1022     /* Return module handle in %es */
1023
1024     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1025
1026     return TRUE;
1027 }
1028
1029
1030 /**********************************************************************
1031  *          DefineHandleTable    (KERNEL.94)
1032  */
1033 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1034 {
1035     FIXME("(%04x): stub ?\n", wOffset);
1036     return TRUE;
1037 }
1038
1039
1040 /***********************************************************************
1041  *           SetTaskQueue  (KERNEL.34)
1042  */
1043 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1044 {
1045     FIXME( "stub, should not get called\n" );
1046     return 0xbeef;
1047 }
1048
1049
1050 /***********************************************************************
1051  *           GetTaskQueue  (KERNEL.35)
1052  */
1053 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1054 {
1055     FIXME( "stub, should not get called\n" );
1056     return 0xbeef;
1057 }
1058
1059 /***********************************************************************
1060  *           SetThreadQueue  (KERNEL.463)
1061  */
1062 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1063 {
1064     FIXME( "stub, should not get called\n" );
1065     return 0xbeef;
1066 }
1067
1068 /***********************************************************************
1069  *           GetThreadQueue  (KERNEL.464)
1070  */
1071 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1072 {
1073     FIXME( "stub, should not get called\n" );
1074     return 0xbeef;
1075 }
1076
1077 /***********************************************************************
1078  *           SetFastQueue  (KERNEL.624)
1079  */
1080 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1081 {
1082     FIXME( "stub, should not get called\n" );
1083 }
1084
1085 /***********************************************************************
1086  *           GetFastQueue  (KERNEL.625)
1087  */
1088 HQUEUE16 WINAPI GetFastQueue16( void )
1089 {
1090     FIXME( "stub, should not get called\n" );
1091     return 0xbeef;
1092 }
1093
1094 /***********************************************************************
1095  *           SwitchStackTo   (KERNEL.108)
1096  */
1097 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1098 {
1099     STACK16FRAME *oldFrame, *newFrame;
1100     INSTANCEDATA *pData;
1101     UINT16 copySize;
1102
1103     if (!(pData = GlobalLock16( seg ))) return;
1104     TRACE("old=%04x:%04x new=%04x:%04x\n",
1105           SELECTOROF( NtCurrentTeb()->WOW32Reserved ),
1106           OFFSETOF( NtCurrentTeb()->WOW32Reserved ), seg, ptr );
1107
1108     /* Save the old stack */
1109
1110     oldFrame = CURRENT_STACK16;
1111     /* pop frame + args and push bp */
1112     pData->old_ss_sp   = (SEGPTR)NtCurrentTeb()->WOW32Reserved + sizeof(STACK16FRAME)
1113                            + 2 * sizeof(WORD);
1114     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1115     pData->stacktop    = top;
1116     pData->stackmin    = ptr;
1117     pData->stackbottom = ptr;
1118
1119     /* Switch to the new stack */
1120
1121     /* Note: we need to take the 3 arguments into account; otherwise,
1122      * the stack will underflow upon return from this function.
1123      */
1124     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1125     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1126     NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR( seg, ptr - copySize );
1127     newFrame = CURRENT_STACK16;
1128
1129     /* Copy the stack frame and the local variables to the new stack */
1130
1131     memmove( newFrame, oldFrame, copySize );
1132     newFrame->bp = ptr;
1133     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1134 }
1135
1136
1137 /***********************************************************************
1138  *           SwitchStackBack   (KERNEL.109)
1139  */
1140 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1141 {
1142     STACK16FRAME *oldFrame, *newFrame;
1143     INSTANCEDATA *pData;
1144
1145     if (!(pData = GlobalLock16(SELECTOROF(NtCurrentTeb()->WOW32Reserved))))
1146         return;
1147     if (!pData->old_ss_sp)
1148     {
1149         WARN("No previous SwitchStackTo\n" );
1150         return;
1151     }
1152     TRACE("restoring stack %04x:%04x\n",
1153           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1154
1155     oldFrame = CURRENT_STACK16;
1156
1157     /* Pop bp from the previous stack */
1158
1159     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1160     pData->old_ss_sp += sizeof(WORD);
1161
1162     /* Switch back to the old stack */
1163
1164     NtCurrentTeb()->WOW32Reserved = (void *)(pData->old_ss_sp - sizeof(STACK16FRAME));
1165     context->SegSs = SELECTOROF(pData->old_ss_sp);
1166     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1167     pData->old_ss_sp = 0;
1168
1169     /* Build a stack frame for the return */
1170
1171     newFrame = CURRENT_STACK16;
1172     newFrame->frame32     = oldFrame->frame32;
1173     newFrame->module_cs   = oldFrame->module_cs;
1174     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1175     newFrame->entry_ip    = oldFrame->entry_ip;
1176 }
1177
1178
1179 /***********************************************************************
1180  *           GetTaskQueueDS  (KERNEL.118)
1181  */
1182 void WINAPI GetTaskQueueDS16(void)
1183 {
1184     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1185 }
1186
1187
1188 /***********************************************************************
1189  *           GetTaskQueueES  (KERNEL.119)
1190  */
1191 void WINAPI GetTaskQueueES16(void)
1192 {
1193     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1194 }
1195
1196
1197 /***********************************************************************
1198  *           GetCurrentTask   (KERNEL32.@)
1199  */
1200 HTASK16 WINAPI GetCurrentTask(void)
1201 {
1202     HTASK16 ret = kernel_get_thread_data()->htask16;
1203     if (!ret) ret = main_task;
1204     return ret;
1205 }
1206
1207 /***********************************************************************
1208  *           GetCurrentTask   (KERNEL.36)
1209  */
1210 DWORD WINAPI WIN16_GetCurrentTask(void)
1211 {
1212     /* This is the version used by relay code; the first task is */
1213     /* returned in the high word of the result */
1214     return MAKELONG( GetCurrentTask(), hFirstTask );
1215 }
1216
1217
1218 /***********************************************************************
1219  *           GetCurrentPDB   (KERNEL.37)
1220  *
1221  * UNDOC: returns PSP of KERNEL in high word
1222  */
1223 DWORD WINAPI GetCurrentPDB16(void)
1224 {
1225     TDB *pTask;
1226
1227     if (!(pTask = TASK_GetCurrent())) return 0;
1228     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1229 }
1230
1231
1232 /***********************************************************************
1233  *           GetCurPID   (KERNEL.157)
1234  */
1235 DWORD WINAPI GetCurPID16( DWORD unused )
1236 {
1237     return 0;
1238 }
1239
1240
1241 /***********************************************************************
1242  *           GetInstanceData   (KERNEL.54)
1243  */
1244 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1245 {
1246     char *ptr = GlobalLock16( instance );
1247     if (!ptr || !len) return 0;
1248     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1249     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1250     return len;
1251 }
1252
1253
1254 /***********************************************************************
1255  *           GetExeVersion   (KERNEL.105)
1256  */
1257 WORD WINAPI GetExeVersion16(void)
1258 {
1259     TDB *pTask;
1260
1261     if (!(pTask = TASK_GetCurrent())) return 0;
1262     return pTask->version;
1263 }
1264
1265
1266 /***********************************************************************
1267  *           SetErrorMode   (KERNEL.107)
1268  */
1269 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1270 {
1271     TDB *pTask;
1272     if (!(pTask = TASK_GetCurrent())) return 0;
1273     pTask->error_mode = mode;
1274     return SetErrorMode( mode );
1275 }
1276
1277
1278 /***********************************************************************
1279  *           GetNumTasks   (KERNEL.152)
1280  */
1281 UINT16 WINAPI GetNumTasks16(void)
1282 {
1283     return nTaskCount;
1284 }
1285
1286
1287 /***********************************************************************
1288  *           GetTaskDS   (KERNEL.155)
1289  *
1290  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1291  * I don't think we need to bother with this.
1292  */
1293 HINSTANCE16 WINAPI GetTaskDS16(void)
1294 {
1295     TDB *pTask;
1296
1297     if (!(pTask = TASK_GetCurrent())) return 0;
1298     return GlobalHandleToSel16(pTask->hInstance);
1299 }
1300
1301 /***********************************************************************
1302  *           GetDummyModuleHandleDS   (KERNEL.602)
1303  */
1304 WORD WINAPI GetDummyModuleHandleDS16(void)
1305 {
1306     TDB *pTask;
1307     WORD selector;
1308
1309     if (!(pTask = TASK_GetCurrent())) return 0;
1310     if (!(pTask->flags & TDBF_WIN32)) return 0;
1311     selector = GlobalHandleToSel16( pTask->hModule );
1312     CURRENT_DS = selector;
1313     return selector;
1314 }
1315
1316 /***********************************************************************
1317  *           IsTask   (KERNEL.320)
1318  */
1319 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1320 {
1321     TDB *pTask;
1322
1323     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1324     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1325     return (pTask->magic == TDB_MAGIC);
1326 }
1327
1328
1329 /***********************************************************************
1330  *           IsWinOldApTask   (KERNEL.158)
1331  */
1332 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1333 {
1334     /* should return bit 0 of byte 0x48 in PSP */
1335     return FALSE;
1336 }
1337
1338 /***********************************************************************
1339  *           SetTaskSignalProc   (KERNEL.38)
1340  */
1341 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1342 {
1343     TDB *pTask;
1344     FARPROC16 oldProc;
1345
1346     if (!hTask) hTask = GetCurrentTask();
1347     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1348     oldProc = pTask->userhandler;
1349     pTask->userhandler = proc;
1350     return oldProc;
1351 }
1352
1353 /***********************************************************************
1354  *           SetSigHandler   (KERNEL.140)
1355  */
1356 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1357                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1358 {
1359     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1360           newhandler,oldhandler,oldmode,newmode,flag );
1361
1362     if (flag != 1) return 0;
1363     if (!newmode) newhandler = NULL;  /* Default handler */
1364     if (newmode != 4)
1365     {
1366         TDB *pTask;
1367
1368         if (!(pTask = TASK_GetCurrent())) return 0;
1369         if (oldmode) *oldmode = pTask->signal_flags;
1370         pTask->signal_flags = newmode;
1371         if (oldhandler) *oldhandler = pTask->sighandler;
1372         pTask->sighandler = newhandler;
1373     }
1374     return 0;
1375 }
1376
1377
1378 /***********************************************************************
1379  *           GlobalNotify   (KERNEL.154)
1380  *
1381  * Note that GlobalNotify does _not_ return the old NotifyProc
1382  * -- contrary to LocalNotify !!
1383  */
1384 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1385 {
1386     TDB *pTask;
1387
1388     if (!(pTask = TASK_GetCurrent())) return;
1389     pTask->discardhandler = proc;
1390 }
1391
1392
1393 /***********************************************************************
1394  *           GetExePtrHelper
1395  */
1396 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1397 {
1398     char *ptr;
1399     HANDLE16 owner;
1400
1401       /* Check for module handle */
1402
1403     if (!(ptr = GlobalLock16( handle ))) return 0;
1404     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return handle;
1405
1406       /* Search for this handle inside all tasks */
1407
1408     *hTask = hFirstTask;
1409     while (*hTask)
1410     {
1411         TDB *pTask = TASK_GetPtr( *hTask );
1412         if ((*hTask == handle) ||
1413             (pTask->hInstance == handle) ||
1414             (pTask->hQueue == handle) ||
1415             (pTask->hPDB == handle)) return pTask->hModule;
1416         *hTask = pTask->hNext;
1417     }
1418
1419       /* Check the owner for module handle */
1420
1421     owner = FarGetOwner16( handle );
1422     if (!(ptr = GlobalLock16( owner ))) return 0;
1423     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return owner;
1424
1425       /* Search for the owner inside all tasks */
1426
1427     *hTask = hFirstTask;
1428     while (*hTask)
1429     {
1430         TDB *pTask = TASK_GetPtr( *hTask );
1431         if ((*hTask == owner) ||
1432             (pTask->hInstance == owner) ||
1433             (pTask->hQueue == owner) ||
1434             (pTask->hPDB == owner)) return pTask->hModule;
1435         *hTask = pTask->hNext;
1436     }
1437
1438     return 0;
1439 }
1440
1441 /***********************************************************************
1442  *           GetExePtr   (KERNEL.133)
1443  */
1444 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1445 {
1446     HTASK16 hTask = 0;
1447     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1448     STACK16FRAME *frame = CURRENT_STACK16;
1449     frame->ecx = hModule;
1450     if (hTask) frame->es = hTask;
1451     return hModule;
1452 }
1453
1454
1455 /***********************************************************************
1456  *           K228   (KERNEL.228)
1457  */
1458 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1459 {
1460     HTASK16 hTask = 0;
1461     return GetExePtrHelper( handle, &hTask );
1462 }
1463
1464
1465 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1466
1467 /**************************************************************************
1468  *           FatalAppExit   (KERNEL.137)
1469  */
1470 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1471 {
1472     TDB *pTask = TASK_GetCurrent();
1473
1474     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1475     {
1476         HMODULE mod = GetModuleHandleA( "user32.dll" );
1477         if (mod)
1478         {
1479             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1480             if (pMessageBoxA)
1481             {
1482                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1483                 goto done;
1484             }
1485         }
1486         ERR( "%s\n", debugstr_a(str) );
1487     }
1488  done:
1489     ExitThread(0xff);
1490 }
1491
1492
1493 /***********************************************************************
1494  *           GetAppCompatFlags   (KERNEL.354)
1495  */
1496 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1497 {
1498     TDB *pTask;
1499
1500     if (!hTask) hTask = GetCurrentTask();
1501     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1502     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1503     return pTask->compat_flags;
1504 }
1505
1506
1507 /***********************************************************************
1508  *           GetDOSEnvironment     (KERNEL.131)
1509  *
1510  * Note: the environment is allocated once, it doesn't track changes
1511  * made using the Win32 API. This shouldn't matter.
1512  *
1513  * Format of a 16-bit environment block:
1514  * ASCIIZ   string 1 (xx=yy format)
1515  * ...
1516  * ASCIIZ   string n
1517  * BYTE     0
1518  * WORD     1
1519  * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1520  */
1521 SEGPTR WINAPI GetDOSEnvironment16(void)
1522 {
1523     static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1524     static HGLOBAL16 handle;  /* handle to the 16 bit environment */
1525
1526     if (!handle)
1527     {
1528         DWORD size;
1529         LPSTR p, env;
1530
1531         p = env = GetEnvironmentStringsA();
1532         while (*p) p += strlen(p) + 1;
1533         p++;  /* skip last null */
1534         size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1535         handle = GlobalAlloc16( GMEM_FIXED, size );
1536         if (handle)
1537         {
1538             WORD one = 1;
1539             LPSTR env16 = GlobalLock16( handle );
1540             memcpy( env16, env, p - env );
1541             memcpy( env16 + (p - env), &one, sizeof(one));
1542             memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1543             GlobalUnlock16( handle );
1544         }
1545         FreeEnvironmentStringsA( env );
1546     }
1547     return WOWGlobalLock16( handle );
1548 }