dlls/kernel/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <assert.h>
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif
  31
  32 #include "windef.h"
  33 #include "winbase.h"
  34 #include "wingdi.h"
  35 #include "winnt.h"
  36 #include "wownt32.h"
  37 #include "winuser.h"
  38
  39 #include "wine/winbase16.h"
  40 #include "thread.h"
  41 #include "winternl.h"
  42 #include "wine/server.h"
  43 #include "toolhelp.h"
  44 #include "kernel_private.h"
  45 #include "kernel16_private.h"
  46
  47 #include "wine/debug.h"
  48
  49 WINE_DEFAULT_DEBUG_CHANNEL(task);
  50 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
  51
  52 #include "pshpack1.h"
  53
  54 /* Segment containing MakeProcInstance() thunks */
  55 typedef struct
  56 {
  57     WORD  next;       /* Selector of next segment */
  58     WORD  magic;      /* Thunks signature */
  59     WORD  unused;
  60     WORD  free;       /* Head of the free list */
  61     WORD  thunks[4];  /* Each thunk is 4 words long */
  62 } THUNKS;
  63
  64 #include "poppack.h"
  65
  66 #define THUNK_MAGIC  ('P' | ('T' << 8))
  67
  68   /* Min. number of thunks allocated when creating a new segment */
  69 #define MIN_THUNKS  32
  70
  71 #define TDB_MAGIC    ('T' | ('D' << 8))
  72
  73 static THHOOK DefaultThhook;
  74 THHOOK *pThhook = &DefaultThhook;
  75
  76 #define hFirstTask   (pThhook->HeadTDB)
  77 #define hLockedTask  (pThhook->LockTDB)
  78
  79 static UINT16 nTaskCount = 0;
  80
  81 static HTASK16 initial_task, main_task;
  82
  83 /***********************************************************************
  84  *           TASK_InstallTHHook
  85  */
  86 void TASK_InstallTHHook( THHOOK *pNewThhook )
  87 {
  88      THHOOK *pOldThhook = pThhook;
  89
  90      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  91
  92      *pThhook = *pOldThhook;
  93 }
  94
  95 /***********************************************************************
  96  *           TASK_GetPtr
  97  */
  98 static TDB *TASK_GetPtr( HTASK16 hTask )
  99 {
 100     return GlobalLock16( hTask );
 101 }
 102
 103
 104 /***********************************************************************
 105  *           TASK_GetCurrent
 106  */
 107 TDB *TASK_GetCurrent(void)
 108 {
 109     return TASK_GetPtr( GetCurrentTask() );
 110 }
 111
 112
 113 /***********************************************************************
 114  *           TASK_LinkTask
 115  */
 116 static void TASK_LinkTask( HTASK16 hTask )
 117 {
 118     HTASK16 *prevTask;
 119     TDB *pTask;
 120
 121     if (!(pTask = TASK_GetPtr( hTask ))) return;
 122     prevTask = &hFirstTask;
 123     while (*prevTask)
 124     {
 125         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 126         if (prevTaskPtr->priority >= pTask->priority) break;
 127         prevTask = &prevTaskPtr->hNext;
 128     }
 129     pTask->hNext = *prevTask;
 130     *prevTask = hTask;
 131     nTaskCount++;
 132 }
 133
 134
 135 /***********************************************************************
 136  *           TASK_UnlinkTask
 137  */
 138 static void TASK_UnlinkTask( HTASK16 hTask )
 139 {
 140     HTASK16 *prevTask;
 141     TDB *pTask;
 142
 143     prevTask = &hFirstTask;
 144     while (*prevTask && (*prevTask != hTask))
 145     {
 146         pTask = TASK_GetPtr( *prevTask );
 147         prevTask = &pTask->hNext;
 148     }
 149     if (*prevTask)
 150     {
 151         pTask = TASK_GetPtr( *prevTask );
 152         *prevTask = pTask->hNext;
 153         pTask->hNext = 0;
 154         nTaskCount--;
 155     }
 156 }
 157
 158
 159 /***********************************************************************
 160  *           TASK_CreateThunks
 161  *
 162  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 163  * and containing 'count' entries.
 164  */
 165 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 166 {
 167     int i;
 168     WORD free;
 169     THUNKS *pThunk;
 170
 171     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 172     pThunk->next = 0;
 173     pThunk->magic = THUNK_MAGIC;
 174     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 175     free = pThunk->free;
 176     for (i = 0; i < count-1; i++)
 177     {
 178         free += 8;  /* Offset of next thunk */
 179         pThunk->thunks[4*i] = free;
 180     }
 181     pThunk->thunks[4*i] = 0;  /* Last thunk */
 182 }
 183
 184
 185 /***********************************************************************
 186  *           TASK_AllocThunk
 187  *
 188  * Allocate a thunk for MakeProcInstance().
 189  */
 190 static SEGPTR TASK_AllocThunk(void)
 191 {
 192     TDB *pTask;
 193     THUNKS *pThunk;
 194     WORD sel, base;
 195
 196     if (!(pTask = TASK_GetCurrent())) return 0;
 197     sel = pTask->hCSAlias;
 198     pThunk = (THUNKS *)&pTask->thunks;
 199     base = (char *)pThunk - (char *)pTask;
 200     while (!pThunk->free)
 201     {
 202         sel = pThunk->next;
 203         if (!sel)  /* Allocate a new segment */
 204         {
 205             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 206                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 207             if (!sel) return (SEGPTR)0;
 208             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 209             pThunk->next = sel;
 210         }
 211         pThunk = (THUNKS *)GlobalLock16( sel );
 212         base = 0;
 213     }
 214     base += pThunk->free;
 215     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 216     return MAKESEGPTR( sel, base );
 217 }
 218
 219
 220 /***********************************************************************
 221  *           TASK_FreeThunk
 222  *
 223  * Free a MakeProcInstance() thunk.
 224  */
 225 static BOOL TASK_FreeThunk( SEGPTR thunk )
 226 {
 227     TDB *pTask;
 228     THUNKS *pThunk;
 229     WORD sel, base;
 230
 231     if (!(pTask = TASK_GetCurrent())) return 0;
 232     sel = pTask->hCSAlias;
 233     pThunk = (THUNKS *)&pTask->thunks;
 234     base = (char *)pThunk - (char *)pTask;
 235     while (sel && (sel != HIWORD(thunk)))
 236     {
 237         sel = pThunk->next;
 238         pThunk = (THUNKS *)GlobalLock16( sel );
 239         base = 0;
 240     }
 241     if (!sel) return FALSE;
 242     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 243     pThunk->free = LOWORD(thunk) - base;
 244     return TRUE;
 245 }
 246
 247
 248 /***********************************************************************
 249  *           TASK_Create
 250  *
 251  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 252  *       to be careful to protect global data structures. We do this
 253  *       by entering the Win16Lock while linking the task into the
 254  *       global task list.
 255  */
 256 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
 257 {
 258     HTASK16 hTask;
 259     TDB *pTask;
 260     FARPROC16 proc;
 261     char curdir[MAX_PATH];
 262     HMODULE16 hModule = pModule ? pModule->self : 0;
 263
 264       /* Allocate the task structure */
 265
 266     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 267     if (!hTask) return NULL;
 268     pTask = TASK_GetPtr( hTask );
 269     FarSetOwner16( hTask, hModule );
 270
 271     /* Fill the task structure */
 272
 273     pTask->hSelf = hTask;
 274
 275     pTask->version       = pModule ? pModule->ne_expver : 0x0400;
 276     pTask->hModule       = hModule;
 277     pTask->hParent       = GetCurrentTask();
 278     pTask->magic         = TDB_MAGIC;
 279     pTask->nCmdShow      = cmdShow;
 280
 281     GetCurrentDirectoryA( sizeof(curdir), curdir );
 282     GetShortPathNameA( curdir, curdir, sizeof(curdir) );
 283     pTask->curdrive = (curdir[0] - 'A') | 0x80;
 284     lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
 285
 286       /* Create the thunks block */
 287
 288     TASK_CreateThunks( hTask, (char *)&pTask->thunks - (char *)pTask, 7 );
 289
 290       /* Copy the module name */
 291
 292     if (hModule)
 293     {
 294         char name[sizeof(pTask->module_name)+1];
 295         size_t len;
 296         GetModuleName16( hModule, name, sizeof(name) );
 297         len = strlen(name) + 1;
 298         memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
 299         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 300     }
 301
 302       /* Allocate a selector for the PDB */
 303
 304     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 305                                       hModule, WINE_LDT_FLAGS_DATA );
 306
 307       /* Fill the PDB */
 308
 309     pTask->pdb.int20 = 0x20cd;
 310     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 311     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 312     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 313     pTask->pdb.savedint22 = 0;
 314     pTask->pdb.savedint23 = 0;
 315     pTask->pdb.savedint24 = 0;
 316     pTask->pdb.fileHandlesPtr =
 317         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 318     pTask->pdb.hFileHandles = 0;
 319     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 320     /* FIXME: should we make a copy of the environment? */
 321     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 322     pTask->pdb.nbFiles        = 20;
 323
 324     /* Fill the command line */
 325
 326     if (!cmdline)
 327     {
 328         cmdline = GetCommandLineA();
 329         /* remove the first word (program name) */
 330         if (*cmdline == '"')
 331             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 332         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 333         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 334         len = strlen(cmdline);
 335     }
 336     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 337     pTask->pdb.cmdLine[0] = len;
 338     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 339     /* pTask->pdb.cmdLine[len+1] = 0; */
 340
 341     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 342
 343       /* Allocate a code segment alias for the TDB */
 344
 345     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 346                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 347
 348       /* Default DTA overwrites command line */
 349
 350     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 351
 352     /* Create scheduler event for 16-bit tasks */
 353
 354     if ( !(pTask->flags & TDBF_WIN32) )
 355         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 356
 357     if (!initial_task) initial_task = hTask;
 358
 359     return pTask;
 360 }
 361
 362
 363 /***********************************************************************
 364  *           TASK_DeleteTask
 365  */
 366 static void TASK_DeleteTask( HTASK16 hTask )
 367 {
 368     TDB *pTask;
 369     HGLOBAL16 hPDB;
 370
 371     if (!(pTask = TASK_GetPtr( hTask ))) return;
 372     hPDB = pTask->hPDB;
 373
 374     pTask->magic = 0xdead; /* invalidate signature */
 375
 376     /* Free the selector aliases */
 377
 378     GLOBAL_FreeBlock( pTask->hCSAlias );
 379     GLOBAL_FreeBlock( pTask->hPDB );
 380
 381     /* Free the task module */
 382
 383     FreeModule16( pTask->hModule );
 384
 385     /* Free the task structure itself */
 386
 387     GlobalFree16( hTask );
 388
 389     /* Free all memory used by this task (including the 32-bit stack, */
 390     /* the environment block and the thunk segments). */
 391
 392     GlobalFreeAll16( hPDB );
 393 }
 394
 395
 396 /***********************************************************************
 397  *           TASK_CreateMainTask
 398  *
 399  * Create a task for the main (32-bit) process.
 400  */
 401 void TASK_CreateMainTask(void)
 402 {
 403     TDB *pTask;
 404     STARTUPINFOA startup_info;
 405     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 406
 407     GetStartupInfoA( &startup_info );
 408     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 409     pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
 410     if (!pTask)
 411     {
 412         ERR("could not create task for main process\n");
 413         ExitProcess(1);
 414     }
 415
 416     pTask->flags        |= TDBF_WIN32;
 417     pTask->hInstance     = 0;
 418     pTask->hPrevInstance = 0;
 419     pTask->teb           = NtCurrentTeb();
 420
 421     /* Add the task to the linked list */
 422     /* (no need to get the win16 lock, we are the only thread at this point) */
 423     TASK_LinkTask( pTask->hSelf );
 424     main_task = pTask->hSelf;
 425 }
 426
 427
 428 struct create_data
 429 {
 430     TDB                 *task;
 431     WIN16_SUBSYSTEM_TIB *tib;
 432 };
 433
 434 /* allocate the win16 TIB for a new 16-bit task */
 435 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
 436 {
 437     WCHAR path[MAX_PATH];
 438     WIN16_SUBSYSTEM_TIB *tib;
 439     UNICODE_STRING *curdir;
 440     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 441
 442     if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
 443     MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 444     GetLongPathNameW( path, path, MAX_PATH );
 445     if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
 446     else tib->exe_name = NULL;
 447
 448     RtlAcquirePebLock();
 449     if (NtCurrentTeb()->Tib.SubSystemTib)
 450         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 451     else
 452         curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 453     tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
 454     tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
 455     tib->curdir.DosPath.Buffer = tib->curdir_buffer;
 456     tib->curdir.Handle = 0;
 457     memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
 458     tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
 459     RtlReleasePebLock();
 460     return tib;
 461 }
 462
 463 static inline void free_win16_tib( WIN16_SUBSYSTEM_TIB *tib )
 464 {
 465     if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
 466     HeapFree( GetProcessHeap(), 0, tib );
 467 }
 468
 469 /* startup routine for a new 16-bit thread */
 470 static DWORD CALLBACK task_start( LPVOID p )
 471 {
 472     struct create_data *data = p;
 473     TDB *pTask = data->task;
 474     DWORD ret;
 475
 476     kernel_get_thread_data()->htask16 = pTask->hSelf;
 477     NtCurrentTeb()->Tib.SubSystemTib = data->tib;
 478     HeapFree( GetProcessHeap(), 0, data );
 479
 480     _EnterWin16Lock();
 481     TASK_LinkTask( pTask->hSelf );
 482     pTask->teb = NtCurrentTeb();
 483     ret = NE_StartTask();
 484     _LeaveWin16Lock();
 485     return ret;
 486 }
 487
 488
 489 /***********************************************************************
 490  *           TASK_SpawnTask
 491  *
 492  * Spawn a new 16-bit task.
 493  */
 494 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 495                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 496 {
 497     struct create_data *data = NULL;
 498     WIN16_SUBSYSTEM_TIB *tib;
 499     TDB *pTask;
 500
 501     if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
 502     if (!(tib = allocate_win16_tib( pTask ))) goto failed;
 503     if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data)))) goto failed;
 504     data->task = pTask;
 505     data->tib = tib;
 506     if (!(*hThread = CreateThread( NULL, 0, task_start, data, 0, NULL ))) goto failed;
 507     return pTask->hSelf;
 508
 509 failed:
 510     if (tib) free_win16_tib( tib );
 511     HeapFree( GetProcessHeap(), 0, data );
 512     TASK_DeleteTask( pTask->hSelf );
 513     return 0;
 514 }
 515
 516
 517 /***********************************************************************
 518  *           TASK_GetTaskFromThread
 519  */
 520 HTASK16 TASK_GetTaskFromThread( DWORD thread )
 521 {
 522     TDB *p = TASK_GetPtr( hFirstTask );
 523     while (p)
 524     {
 525         if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
 526         p = TASK_GetPtr( p->hNext );
 527     }
 528     return 0;
 529 }
 530
 531
 532 /***********************************************************************
 533  *           TASK_CallTaskSignalProc
 534  */
 535 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
 536 {
 537     WORD args[5];
 538     TDB *pTask = TASK_GetCurrent();
 539
 540     if ( !pTask || !pTask->userhandler ) return;
 541
 542     args[4] = hTaskOrModule;
 543     args[3] = uCode;
 544     args[2] = 0;
 545     args[1] = pTask->hInstance;
 546     args[0] = pTask->hQueue;
 547     WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
 548 }
 549
 550
 551 /***********************************************************************
 552  *           TASK_ExitTask
 553  */
 554 void TASK_ExitTask(void)
 555 {
 556     WIN16_SUBSYSTEM_TIB *tib;
 557     TDB *pTask;
 558     DWORD lockCount;
 559
 560     /* Enter the Win16Lock to protect global data structures */
 561     _EnterWin16Lock();
 562
 563     pTask = TASK_GetCurrent();
 564     if ( !pTask )
 565     {
 566         _LeaveWin16Lock();
 567         return;
 568     }
 569
 570     TRACE("Killing task %04x\n", pTask->hSelf );
 571
 572     /* Perform USER cleanup */
 573
 574     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 575
 576     /* Remove the task from the list to be sure we never switch back to it */
 577     TASK_UnlinkTask( pTask->hSelf );
 578
 579     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 580     {
 581         TRACE("this is the last task, exiting\n" );
 582         ExitKernel16();
 583     }
 584
 585     pTask->nEvents = 0;
 586
 587     if ( hLockedTask == pTask->hSelf )
 588         hLockedTask = 0;
 589
 590     TASK_DeleteTask( pTask->hSelf );
 591
 592     if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
 593     {
 594         free_win16_tib( tib );
 595         NtCurrentTeb()->Tib.SubSystemTib = NULL;
 596     }
 597
 598     /* ... and completely release the Win16Lock, just in case. */
 599     ReleaseThunkLock( &lockCount );
 600 }
 601
 602
 603 /***********************************************************************
 604  *           ExitKernel (KERNEL.2)
 605  *
 606  * Clean-up everything and exit the Wine process.
 607  */
 608 void WINAPI ExitKernel16(void)
 609 {
 610     WriteOutProfiles16();
 611     TerminateProcess( GetCurrentProcess(), 0 );
 612 }
 613
 614
 615 /***********************************************************************
 616  *           InitTask  (KERNEL.91)
 617  *
 618  * Called by the application startup code.
 619  */
 620 void WINAPI InitTask16( CONTEXT86 *context )
 621 {
 622     TDB *pTask;
 623     INSTANCEDATA *pinstance;
 624     SEGPTR ptr;
 625
 626     context->Eax = 0;
 627     if (!(pTask = TASK_GetCurrent())) return;
 628
 629     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 630        as some apps, notably Visual Basic apps, *modify* the heap/stack
 631        size of the instance data segment before calling InitTask() */
 632
 633     /* Initialize the INSTANCEDATA structure */
 634     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 635     pinstance->stackmin    = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + sizeof( STACK16FRAME );
 636     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 637     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 638                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 639
 640     /* Initialize the local heap */
 641     if (LOWORD(context->Ecx))
 642         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 643
 644     /* Initialize implicitly loaded DLLs */
 645     NE_InitializeDLLs( pTask->hModule );
 646     NE_DllProcessAttach( pTask->hModule );
 647
 648     /* Registers on return are:
 649      * ax     1 if OK, 0 on error
 650      * cx     stack limit in bytes
 651      * dx     cmdShow parameter
 652      * si     instance handle of the previous instance
 653      * di     instance handle of the new task
 654      * es:bx  pointer to command line inside PSP
 655      *
 656      * 0 (=%bp) is pushed on the stack
 657      */
 658     ptr = stack16_push( sizeof(WORD) );
 659     *(WORD *)MapSL(ptr) = 0;
 660     context->Esp -= 2;
 661
 662     context->Eax = 1;
 663
 664     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 665     else
 666     {
 667         LPBYTE p = &pTask->pdb.cmdLine[1];
 668         while ((*p == ' ') || (*p == '\t')) p++;
 669         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 670     }
 671     context->Ecx   = pinstance->stacktop;
 672     context->Edx   = pTask->nCmdShow;
 673     context->Esi   = (DWORD)pTask->hPrevInstance;
 674     context->Edi   = (DWORD)pTask->hInstance;
 675     context->SegEs = (WORD)pTask->hPDB;
 676 }
 677
 678
 679 /***********************************************************************
 680  *           WaitEvent  (KERNEL.30)
 681  */
 682 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 683 {
 684     TDB *pTask;
 685
 686     if (!hTask) hTask = GetCurrentTask();
 687     pTask = TASK_GetPtr( hTask );
 688
 689     if (pTask->flags & TDBF_WIN32)
 690     {
 691         FIXME("called for Win32 thread (%04lx)!\n", GetCurrentThreadId());
 692         return TRUE;
 693     }
 694
 695     if (pTask->nEvents > 0)
 696     {
 697         pTask->nEvents--;
 698         return FALSE;
 699     }
 700
 701     if (pTask->teb == NtCurrentTeb())
 702     {
 703         DWORD lockCount;
 704
 705         NtResetEvent( pTask->hEvent, NULL );
 706         ReleaseThunkLock( &lockCount );
 707         SYSLEVEL_CheckNotLevel( 1 );
 708         WaitForSingleObject( pTask->hEvent, INFINITE );
 709         RestoreThunkLock( lockCount );
 710         if (pTask->nEvents > 0) pTask->nEvents--;
 711     }
 712     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 713
 714     return TRUE;
 715 }
 716
 717
 718 /***********************************************************************
 719  *           PostEvent  (KERNEL.31)
 720  */
 721 void WINAPI PostEvent16( HTASK16 hTask )
 722 {
 723     TDB *pTask;
 724
 725     if (!hTask) hTask = GetCurrentTask();
 726     if (!(pTask = TASK_GetPtr( hTask ))) return;
 727
 728     if (pTask->flags & TDBF_WIN32)
 729     {
 730         FIXME("called for Win32 thread (%04lx)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
 731         return;
 732     }
 733
 734     pTask->nEvents++;
 735
 736     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 737 }
 738
 739
 740 /***********************************************************************
 741  *           SetPriority  (KERNEL.32)
 742  */
 743 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 744 {
 745     TDB *pTask;
 746     INT16 newpriority;
 747
 748     if (!hTask) hTask = GetCurrentTask();
 749     if (!(pTask = TASK_GetPtr( hTask ))) return;
 750     newpriority = pTask->priority + delta;
 751     if (newpriority < -32) newpriority = -32;
 752     else if (newpriority > 15) newpriority = 15;
 753
 754     pTask->priority = newpriority + 1;
 755     TASK_UnlinkTask( pTask->hSelf );
 756     TASK_LinkTask( pTask->hSelf );
 757     pTask->priority--;
 758 }
 759
 760
 761 /***********************************************************************
 762  *           LockCurrentTask  (KERNEL.33)
 763  */
 764 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 765 {
 766     if (bLock) hLockedTask = GetCurrentTask();
 767     else hLockedTask = 0;
 768     return hLockedTask;
 769 }
 770
 771
 772 /***********************************************************************
 773  *           IsTaskLocked  (KERNEL.122)
 774  */
 775 HTASK16 WINAPI IsTaskLocked16(void)
 776 {
 777     return hLockedTask;
 778 }
 779
 780
 781 /***********************************************************************
 782  *           OldYield  (KERNEL.117)
 783  */
 784 void WINAPI OldYield16(void)
 785 {
 786    DWORD count;
 787
 788    ReleaseThunkLock(&count);
 789    RestoreThunkLock(count);
 790 }
 791
 792 /***********************************************************************
 793  *           WIN32_OldYield  (KERNEL.447)
 794  */
 795 void WINAPI WIN32_OldYield16(void)
 796 {
 797    DWORD count;
 798
 799    ReleaseThunkLock(&count);
 800    RestoreThunkLock(count);
 801 }
 802
 803 /***********************************************************************
 804  *           DirectedYield  (KERNEL.150)
 805  */
 806 void WINAPI DirectedYield16( HTASK16 hTask )
 807 {
 808     OldYield16();
 809 }
 810
 811 /***********************************************************************
 812  *           Yield  (KERNEL.29)
 813  */
 814 void WINAPI Yield16(void)
 815 {
 816     TDB *pCurTask = TASK_GetCurrent();
 817
 818     if (pCurTask && pCurTask->hQueue)
 819     {
 820         HMODULE mod = GetModuleHandleA( "user32.dll" );
 821         if (mod)
 822         {
 823             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 824             if (proc)
 825             {
 826                 proc();
 827                 return;
 828             }
 829         }
 830     }
 831     OldYield16();
 832 }
 833
 834 /***********************************************************************
 835  *           KERNEL_490  (KERNEL.490)
 836  */
 837 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 838 {
 839     if ( !someTask ) return 0;
 840
 841     FIXME("(%04x): stub\n", someTask );
 842     return 0;
 843 }
 844
 845 /***********************************************************************
 846  *           MakeProcInstance  (KERNEL.51)
 847  */
 848 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 849 {
 850     BYTE *thunk,*lfunc;
 851     SEGPTR thunkaddr;
 852     WORD hInstanceSelector;
 853
 854     hInstanceSelector = GlobalHandleToSel16(hInstance);
 855
 856     TRACE("(%p, %04x);\n", func, hInstance);
 857
 858     if (!HIWORD(func)) {
 859       /* Win95 actually protects via SEH, but this is better for debugging */
 860       WARN("Ouch ! Called with invalid func %p !\n", func);
 861       return (FARPROC16)0;
 862     }
 863
 864     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 865       && (hInstance != 0)
 866       && (hInstance != 0xffff) )
 867     {
 868         /* calling MPI with a foreign DSEG is invalid ! */
 869         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 870                    hInstance,CURRENT_DS);
 871     }
 872
 873     /* Always use the DSEG that MPI was entered with.
 874      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 875      * as CURRENT_DS provides the DSEG value we need.
 876      * ("calling" DS, *not* "task" DS !) */
 877     hInstanceSelector = CURRENT_DS;
 878     hInstance = GlobalHandle16(hInstanceSelector);
 879
 880     /* no thunking for DLLs */
 881     if (NE_GetPtr(FarGetOwner16(hInstance))->ne_flags & NE_FFLAGS_LIBMODULE)
 882         return func;
 883
 884     thunkaddr = TASK_AllocThunk();
 885     if (!thunkaddr) return (FARPROC16)0;
 886     thunk = MapSL( thunkaddr );
 887     lfunc = MapSL( (SEGPTR)func );
 888
 889     TRACE("(%p,%04x): got thunk %08lx\n", func, hInstance, thunkaddr );
 890     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 891         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 892     ) {
 893         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 894     }
 895
 896     *thunk++ = 0xb8;    /* movw instance, %ax */
 897     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 898     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 899     *thunk++ = 0xea;    /* ljmp func */
 900     *(DWORD *)thunk = (DWORD)func;
 901     return (FARPROC16)thunkaddr;
 902     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 903 }
 904
 905
 906 /***********************************************************************
 907  *           FreeProcInstance  (KERNEL.52)
 908  */
 909 void WINAPI FreeProcInstance16( FARPROC16 func )
 910 {
 911     TRACE("(%p)\n", func );
 912     TASK_FreeThunk( (SEGPTR)func );
 913 }
 914
 915 /**********************************************************************
 916  *          TASK_GetCodeSegment
 917  *
 918  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 919  * and logical segment number of a given code segment.
 920  *
 921  * 'proc' either *is* already a pair of module handle and segment number,
 922  * in which case there's nothing to do.  Otherwise, it is a pointer to
 923  * a function, and we need to retrieve the code segment.  If the pointer
 924  * happens to point to a thunk, we'll retrieve info about the code segment
 925  * where the function pointed to by the thunk resides, not the thunk itself.
 926  *
 927  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 928  *        the function the snoop code will return to ...
 929  *
 930  */
 931 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 932                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 933 {
 934     NE_MODULE *pModule = NULL;
 935     SEGTABLEENTRY *pSeg = NULL;
 936     int segNr=0;
 937
 938     /* Try pair of module handle / segment number */
 939     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 940     if ( pModule && pModule->ne_magic == IMAGE_OS2_SIGNATURE )
 941     {
 942         segNr = LOWORD( proc );
 943         if ( segNr && segNr <= pModule->ne_cseg )
 944             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 945     }
 946
 947     /* Try thunk or function */
 948     else
 949     {
 950         BYTE *thunk = MapSL( (SEGPTR)proc );
 951         WORD selector;
 952
 953         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 954             selector = thunk[6] + (thunk[7] << 8);
 955         else
 956             selector = HIWORD( proc );
 957
 958         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 959         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 960
 961         if ( pModule )
 962             for ( segNr = 1; segNr <= pModule->ne_cseg; segNr++, pSeg++ )
 963                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 964                     break;
 965
 966         if ( pModule && segNr > pModule->ne_cseg )
 967             pSeg = NULL;
 968     }
 969
 970     /* Abort if segment not found */
 971
 972     if ( !pModule || !pSeg )
 973         return FALSE;
 974
 975     /* Return segment data */
 976
 977     if ( ppModule ) *ppModule = pModule;
 978     if ( ppSeg    ) *ppSeg    = pSeg;
 979     if ( pSegNr   ) *pSegNr   = segNr;
 980
 981     return TRUE;
 982 }
 983
 984 /**********************************************************************
 985  *          GetCodeHandle    (KERNEL.93)
 986  */
 987 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 988 {
 989     SEGTABLEENTRY *pSeg;
 990
 991     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 992         return (HANDLE16)0;
 993
 994     return pSeg->hSeg;
 995 }
 996
 997 /**********************************************************************
 998  *          GetCodeInfo    (KERNEL.104)
 999  */
1000 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
1001 {
1002     NE_MODULE *pModule;
1003     SEGTABLEENTRY *pSeg;
1004     int segNr;
1005
1006     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
1007         return FALSE;
1008
1009     /* Fill in segment information */
1010
1011     segInfo->offSegment = pSeg->filepos;
1012     segInfo->cbSegment  = pSeg->size;
1013     segInfo->flags      = pSeg->flags;
1014     segInfo->cbAlloc    = pSeg->minsize;
1015     segInfo->h          = pSeg->hSeg;
1016     segInfo->alignShift = pModule->ne_align;
1017
1018     if ( segNr == pModule->ne_autodata )
1019         segInfo->cbAlloc += pModule->ne_heap + pModule->ne_stack;
1020
1021     /* Return module handle in %es */
1022
1023     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1024
1025     return TRUE;
1026 }
1027
1028
1029 /**********************************************************************
1030  *          DefineHandleTable    (KERNEL.94)
1031  */
1032 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1033 {
1034     FIXME("(%04x): stub ?\n", wOffset);
1035     return TRUE;
1036 }
1037
1038
1039 /***********************************************************************
1040  *           SetTaskQueue  (KERNEL.34)
1041  */
1042 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1043 {
1044     FIXME( "stub, should not get called\n" );
1045     return 0xbeef;
1046 }
1047
1048
1049 /***********************************************************************
1050  *           GetTaskQueue  (KERNEL.35)
1051  */
1052 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1053 {
1054     FIXME( "stub, should not get called\n" );
1055     return 0xbeef;
1056 }
1057
1058 /***********************************************************************
1059  *           SetThreadQueue  (KERNEL.463)
1060  */
1061 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1062 {
1063     FIXME( "stub, should not get called\n" );
1064     return 0xbeef;
1065 }
1066
1067 /***********************************************************************
1068  *           GetThreadQueue  (KERNEL.464)
1069  */
1070 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1071 {
1072     FIXME( "stub, should not get called\n" );
1073     return 0xbeef;
1074 }
1075
1076 /***********************************************************************
1077  *           SetFastQueue  (KERNEL.624)
1078  */
1079 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1080 {
1081     FIXME( "stub, should not get called\n" );
1082 }
1083
1084 /***********************************************************************
1085  *           GetFastQueue  (KERNEL.625)
1086  */
1087 HQUEUE16 WINAPI GetFastQueue16( void )
1088 {
1089     FIXME( "stub, should not get called\n" );
1090     return 0xbeef;
1091 }
1092
1093 /***********************************************************************
1094  *           SwitchStackTo   (KERNEL.108)
1095  */
1096 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1097 {
1098     STACK16FRAME *oldFrame, *newFrame;
1099     INSTANCEDATA *pData;
1100     UINT16 copySize;
1101
1102     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1103     TRACE("old=%04x:%04x new=%04x:%04x\n",
1104           SELECTOROF( NtCurrentTeb()->WOW32Reserved ),
1105           OFFSETOF( NtCurrentTeb()->WOW32Reserved ), seg, ptr );
1106
1107     /* Save the old stack */
1108
1109     oldFrame = CURRENT_STACK16;
1110     /* pop frame + args and push bp */
1111     pData->old_ss_sp   = (SEGPTR)NtCurrentTeb()->WOW32Reserved + sizeof(STACK16FRAME)
1112                            + 2 * sizeof(WORD);
1113     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1114     pData->stacktop    = top;
1115     pData->stackmin    = ptr;
1116     pData->stackbottom = ptr;
1117
1118     /* Switch to the new stack */
1119
1120     /* Note: we need to take the 3 arguments into account; otherwise,
1121      * the stack will underflow upon return from this function.
1122      */
1123     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1124     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1125     NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR( seg, ptr - copySize );
1126     newFrame = CURRENT_STACK16;
1127
1128     /* Copy the stack frame and the local variables to the new stack */
1129
1130     memmove( newFrame, oldFrame, copySize );
1131     newFrame->bp = ptr;
1132     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1133 }
1134
1135
1136 /***********************************************************************
1137  *           SwitchStackBack   (KERNEL.109)
1138  */
1139 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1140 {
1141     STACK16FRAME *oldFrame, *newFrame;
1142     INSTANCEDATA *pData;
1143
1144     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->WOW32Reserved))))
1145         return;
1146     if (!pData->old_ss_sp)
1147     {
1148         WARN("No previous SwitchStackTo\n" );
1149         return;
1150     }
1151     TRACE("restoring stack %04x:%04x\n",
1152           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1153
1154     oldFrame = CURRENT_STACK16;
1155
1156     /* Pop bp from the previous stack */
1157
1158     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1159     pData->old_ss_sp += sizeof(WORD);
1160
1161     /* Switch back to the old stack */
1162
1163     NtCurrentTeb()->WOW32Reserved = (void *)(pData->old_ss_sp - sizeof(STACK16FRAME));
1164     context->SegSs = SELECTOROF(pData->old_ss_sp);
1165     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1166     pData->old_ss_sp = 0;
1167
1168     /* Build a stack frame for the return */
1169
1170     newFrame = CURRENT_STACK16;
1171     newFrame->frame32     = oldFrame->frame32;
1172     newFrame->module_cs   = oldFrame->module_cs;
1173     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1174     newFrame->entry_ip    = oldFrame->entry_ip;
1175 }
1176
1177
1178 /***********************************************************************
1179  *           GetTaskQueueDS  (KERNEL.118)
1180  */
1181 void WINAPI GetTaskQueueDS16(void)
1182 {
1183     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1184 }
1185
1186
1187 /***********************************************************************
1188  *           GetTaskQueueES  (KERNEL.119)
1189  */
1190 void WINAPI GetTaskQueueES16(void)
1191 {
1192     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1193 }
1194
1195
1196 /***********************************************************************
1197  *           GetCurrentTask   (KERNEL32.@)
1198  */
1199 HTASK16 WINAPI GetCurrentTask(void)
1200 {
1201     HTASK16 ret = kernel_get_thread_data()->htask16;
1202     if (!ret) ret = main_task;
1203     return ret;
1204 }
1205
1206 /***********************************************************************
1207  *           GetCurrentTask   (KERNEL.36)
1208  */
1209 DWORD WINAPI WIN16_GetCurrentTask(void)
1210 {
1211     /* This is the version used by relay code; the first task is */
1212     /* returned in the high word of the result */
1213     return MAKELONG( GetCurrentTask(), hFirstTask );
1214 }
1215
1216
1217 /***********************************************************************
1218  *           GetCurrentPDB   (KERNEL.37)
1219  *
1220  * UNDOC: returns PSP of KERNEL in high word
1221  */
1222 DWORD WINAPI GetCurrentPDB16(void)
1223 {
1224     TDB *pTask;
1225
1226     if (!(pTask = TASK_GetCurrent())) return 0;
1227     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1228 }
1229
1230
1231 /***********************************************************************
1232  *           GetCurPID   (KERNEL.157)
1233  */
1234 DWORD WINAPI GetCurPID16( DWORD unused )
1235 {
1236     return 0;
1237 }
1238
1239
1240 /***********************************************************************
1241  *           GetInstanceData   (KERNEL.54)
1242  */
1243 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1244 {
1245     char *ptr = (char *)GlobalLock16( instance );
1246     if (!ptr || !len) return 0;
1247     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1248     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1249     return len;
1250 }
1251
1252
1253 /***********************************************************************
1254  *           GetExeVersion   (KERNEL.105)
1255  */
1256 WORD WINAPI GetExeVersion16(void)
1257 {
1258     TDB *pTask;
1259
1260     if (!(pTask = TASK_GetCurrent())) return 0;
1261     return pTask->version;
1262 }
1263
1264
1265 /***********************************************************************
1266  *           SetErrorMode   (KERNEL.107)
1267  */
1268 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1269 {
1270     TDB *pTask;
1271     if (!(pTask = TASK_GetCurrent())) return 0;
1272     pTask->error_mode = mode;
1273     return SetErrorMode( mode );
1274 }
1275
1276
1277 /***********************************************************************
1278  *           GetNumTasks   (KERNEL.152)
1279  */
1280 UINT16 WINAPI GetNumTasks16(void)
1281 {
1282     return nTaskCount;
1283 }
1284
1285
1286 /***********************************************************************
1287  *           GetTaskDS   (KERNEL.155)
1288  *
1289  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1290  * I don't think we need to bother with this.
1291  */
1292 HINSTANCE16 WINAPI GetTaskDS16(void)
1293 {
1294     TDB *pTask;
1295
1296     if (!(pTask = TASK_GetCurrent())) return 0;
1297     return GlobalHandleToSel16(pTask->hInstance);
1298 }
1299
1300 /***********************************************************************
1301  *           GetDummyModuleHandleDS   (KERNEL.602)
1302  */
1303 WORD WINAPI GetDummyModuleHandleDS16(void)
1304 {
1305     TDB *pTask;
1306     WORD selector;
1307
1308     if (!(pTask = TASK_GetCurrent())) return 0;
1309     if (!(pTask->flags & TDBF_WIN32)) return 0;
1310     selector = GlobalHandleToSel16( pTask->hModule );
1311     CURRENT_DS = selector;
1312     return selector;
1313 }
1314
1315 /***********************************************************************
1316  *           IsTask   (KERNEL.320)
1317  */
1318 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1319 {
1320     TDB *pTask;
1321
1322     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1323     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1324     return (pTask->magic == TDB_MAGIC);
1325 }
1326
1327
1328 /***********************************************************************
1329  *           IsWinOldApTask   (KERNEL.158)
1330  */
1331 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1332 {
1333     /* should return bit 0 of byte 0x48 in PSP */
1334     return FALSE;
1335 }
1336
1337 /***********************************************************************
1338  *           SetTaskSignalProc   (KERNEL.38)
1339  */
1340 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1341 {
1342     TDB *pTask;
1343     FARPROC16 oldProc;
1344
1345     if (!hTask) hTask = GetCurrentTask();
1346     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1347     oldProc = pTask->userhandler;
1348     pTask->userhandler = proc;
1349     return oldProc;
1350 }
1351
1352 /***********************************************************************
1353  *           SetSigHandler   (KERNEL.140)
1354  */
1355 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1356                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1357 {
1358     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1359           newhandler,oldhandler,oldmode,newmode,flag );
1360
1361     if (flag != 1) return 0;
1362     if (!newmode) newhandler = NULL;  /* Default handler */
1363     if (newmode != 4)
1364     {
1365         TDB *pTask;
1366
1367         if (!(pTask = TASK_GetCurrent())) return 0;
1368         if (oldmode) *oldmode = pTask->signal_flags;
1369         pTask->signal_flags = newmode;
1370         if (oldhandler) *oldhandler = pTask->sighandler;
1371         pTask->sighandler = newhandler;
1372     }
1373     return 0;
1374 }
1375
1376
1377 /***********************************************************************
1378  *           GlobalNotify   (KERNEL.154)
1379  *
1380  * Note that GlobalNotify does _not_ return the old NotifyProc
1381  * -- contrary to LocalNotify !!
1382  */
1383 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1384 {
1385     TDB *pTask;
1386
1387     if (!(pTask = TASK_GetCurrent())) return;
1388     pTask->discardhandler = proc;
1389 }
1390
1391
1392 /***********************************************************************
1393  *           GetExePtrHelper
1394  */
1395 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1396 {
1397     char *ptr;
1398     HANDLE16 owner;
1399
1400       /* Check for module handle */
1401
1402     if (!(ptr = GlobalLock16( handle ))) return 0;
1403     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return handle;
1404
1405       /* Search for this handle inside all tasks */
1406
1407     *hTask = hFirstTask;
1408     while (*hTask)
1409     {
1410         TDB *pTask = TASK_GetPtr( *hTask );
1411         if ((*hTask == handle) ||
1412             (pTask->hInstance == handle) ||
1413             (pTask->hQueue == handle) ||
1414             (pTask->hPDB == handle)) return pTask->hModule;
1415         *hTask = pTask->hNext;
1416     }
1417
1418       /* Check the owner for module handle */
1419
1420     owner = FarGetOwner16( handle );
1421     if (!(ptr = GlobalLock16( owner ))) return 0;
1422     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return owner;
1423
1424       /* Search for the owner inside all tasks */
1425
1426     *hTask = hFirstTask;
1427     while (*hTask)
1428     {
1429         TDB *pTask = TASK_GetPtr( *hTask );
1430         if ((*hTask == owner) ||
1431             (pTask->hInstance == owner) ||
1432             (pTask->hQueue == owner) ||
1433             (pTask->hPDB == owner)) return pTask->hModule;
1434         *hTask = pTask->hNext;
1435     }
1436
1437     return 0;
1438 }
1439
1440 /***********************************************************************
1441  *           GetExePtr   (KERNEL.133)
1442  */
1443 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1444 {
1445     HTASK16 hTask = 0;
1446     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1447     STACK16FRAME *frame = CURRENT_STACK16;
1448     frame->ecx = hModule;
1449     if (hTask) frame->es = hTask;
1450     return hModule;
1451 }
1452
1453
1454 /***********************************************************************
1455  *           K228   (KERNEL.228)
1456  */
1457 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1458 {
1459     HTASK16 hTask = 0;
1460     return GetExePtrHelper( handle, &hTask );
1461 }
1462
1463
1464 /***********************************************************************
1465  *           TaskFirst   (TOOLHELP.63)
1466  */
1467 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1468 {
1469     lpte->hNext = hFirstTask;
1470     return TaskNext16( lpte );
1471 }
1472
1473
1474 /***********************************************************************
1475  *           TaskNext   (TOOLHELP.64)
1476  */
1477 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1478 {
1479     TDB *pTask;
1480     INSTANCEDATA *pInstData;
1481
1482     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1483     if (!lpte->hNext) return FALSE;
1484
1485     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1486     while (1) {
1487         pTask = TASK_GetPtr( lpte->hNext );
1488         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1489         if (pTask->hInstance)
1490             break;
1491         lpte->hNext = pTask->hNext;
1492     }
1493     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1494     lpte->hTask         = lpte->hNext;
1495     lpte->hTaskParent   = pTask->hParent;
1496     lpte->hInst         = pTask->hInstance;
1497     lpte->hModule       = pTask->hModule;
1498     lpte->wSS           = SELECTOROF( pTask->teb->WOW32Reserved );
1499     lpte->wSP           = OFFSETOF( pTask->teb->WOW32Reserved );
1500     lpte->wStackTop     = pInstData->stacktop;
1501     lpte->wStackMinimum = pInstData->stackmin;
1502     lpte->wStackBottom  = pInstData->stackbottom;
1503     lpte->wcEvents      = pTask->nEvents;
1504     lpte->hQueue        = pTask->hQueue;
1505     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1506     lpte->wPSPOffset    = 0x100;  /*??*/
1507     lpte->hNext         = pTask->hNext;
1508     return TRUE;
1509 }
1510
1511
1512 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1513
1514 /**************************************************************************
1515  *           FatalAppExit   (KERNEL.137)
1516  */
1517 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1518 {
1519     TDB *pTask = TASK_GetCurrent();
1520
1521     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1522     {
1523         HMODULE mod = GetModuleHandleA( "user32.dll" );
1524         if (mod)
1525         {
1526             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1527             if (pMessageBoxA)
1528             {
1529                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1530                 goto done;
1531             }
1532         }
1533         ERR( "%s\n", debugstr_a(str) );
1534     }
1535  done:
1536     ExitThread(0xff);
1537 }
1538
1539
1540 /***********************************************************************
1541  *           TerminateApp   (TOOLHELP.77)
1542  *
1543  * See "Undocumented Windows".
1544  */
1545 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1546 {
1547     if (hTask && hTask != GetCurrentTask())
1548     {
1549         FIXME("cannot terminate task %x\n", hTask);
1550         return;
1551     }
1552
1553     if (wFlags & NO_UAE_BOX)
1554     {
1555         UINT16 old_mode;
1556         old_mode = SetErrorMode16(0);
1557         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1558     }
1559     FatalAppExit16( 0, NULL );
1560
1561     /* hmm, we're still alive ?? */
1562
1563     /* check undocumented flag */
1564     if (!(wFlags & 0x8000))
1565         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1566
1567     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1568        but let's just call ExitThread */
1569     ExitThread(0xff);
1570 }
1571
1572
1573 /***********************************************************************
1574  *           GetAppCompatFlags   (KERNEL.354)
1575  */
1576 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1577 {
1578     TDB *pTask;
1579
1580     if (!hTask) hTask = GetCurrentTask();
1581     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1582     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1583     return pTask->compat_flags;
1584 }
1585
1586
1587 /***********************************************************************
1588  *           GetDOSEnvironment     (KERNEL.131)
1589  *
1590  * Note: the environment is allocated once, it doesn't track changes
1591  * made using the Win32 API. This shouldn't matter.
1592  *
1593  * Format of a 16-bit environment block:
1594  * ASCIIZ   string 1 (xx=yy format)
1595  * ...
1596  * ASCIIZ   string n
1597  * BYTE     0
1598  * WORD     1
1599  * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1600  */
1601 SEGPTR WINAPI GetDOSEnvironment16(void)
1602 {
1603     static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1604     static HGLOBAL16 handle;  /* handle to the 16 bit environment */
1605
1606     if (!handle)
1607     {
1608         DWORD size;
1609         LPSTR p, env;
1610
1611         p = env = GetEnvironmentStringsA();
1612         while (*p) p += strlen(p) + 1;
1613         p++;  /* skip last null */
1614         size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1615         handle = GlobalAlloc16( GMEM_FIXED, size );
1616         if (handle)
1617         {
1618             WORD one = 1;
1619             LPSTR env16 = GlobalLock16( handle );
1620             memcpy( env16, env, p - env );
1621             memcpy( env16 + (p - env), &one, sizeof(one));
1622             memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1623             GlobalUnlock16( handle );
1624         }
1625         FreeEnvironmentStringsA( env );
1626     }
1627     return WOWGlobalLock16( handle );
1628 }