dlls/kernel/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <assert.h>
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif
  31
  32 #include "windef.h"
  33 #include "winbase.h"
  34 #include "wingdi.h"
  35 #include "winnt.h"
  36 #include "wownt32.h"
  37 #include "winuser.h"
  38
  39 #include "wine/winbase16.h"
  40 #include "module.h"
  41 #include "winternl.h"
  42 #include "wine/server.h"
  43 #include "stackframe.h"
  44 #include "thread.h"
  45 #include "toolhelp.h"
  46 #include "kernel_private.h"
  47
  48 #include "wine/debug.h"
  49
  50 WINE_DEFAULT_DEBUG_CHANNEL(task);
  51 WINE_DECLARE_DEBUG_CHANNEL(relay);
  52 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
  53
  54 #include "pshpack1.h"
  55
  56 /* Segment containing MakeProcInstance() thunks */
  57 typedef struct
  58 {
  59     WORD  next;       /* Selector of next segment */
  60     WORD  magic;      /* Thunks signature */
  61     WORD  unused;
  62     WORD  free;       /* Head of the free list */
  63     WORD  thunks[4];  /* Each thunk is 4 words long */
  64 } THUNKS;
  65
  66 #include "poppack.h"
  67
  68 #define THUNK_MAGIC  ('P' | ('T' << 8))
  69
  70   /* Min. number of thunks allocated when creating a new segment */
  71 #define MIN_THUNKS  32
  72
  73 #define TDB_MAGIC    ('T' | ('D' << 8))
  74
  75 static THHOOK DefaultThhook;
  76 THHOOK *pThhook = &DefaultThhook;
  77
  78 #define hFirstTask   (pThhook->HeadTDB)
  79 #define hLockedTask  (pThhook->LockTDB)
  80
  81 static UINT16 nTaskCount = 0;
  82
  83 static HTASK16 initial_task;
  84
  85 /***********************************************************************
  86  *           TASK_InstallTHHook
  87  */
  88 void TASK_InstallTHHook( THHOOK *pNewThhook )
  89 {
  90      THHOOK *pOldThhook = pThhook;
  91
  92      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  93
  94      *pThhook = *pOldThhook;
  95 }
  96
  97 /***********************************************************************
  98  *           TASK_GetPtr
  99  */
 100 static TDB *TASK_GetPtr( HTASK16 hTask )
 101 {
 102     return GlobalLock16( hTask );
 103 }
 104
 105
 106 /***********************************************************************
 107  *           TASK_GetCurrent
 108  */
 109 TDB *TASK_GetCurrent(void)
 110 {
 111     return TASK_GetPtr( GetCurrentTask() );
 112 }
 113
 114
 115 /***********************************************************************
 116  *           TASK_LinkTask
 117  */
 118 static void TASK_LinkTask( HTASK16 hTask )
 119 {
 120     HTASK16 *prevTask;
 121     TDB *pTask;
 122
 123     if (!(pTask = TASK_GetPtr( hTask ))) return;
 124     prevTask = &hFirstTask;
 125     while (*prevTask)
 126     {
 127         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 128         if (prevTaskPtr->priority >= pTask->priority) break;
 129         prevTask = &prevTaskPtr->hNext;
 130     }
 131     pTask->hNext = *prevTask;
 132     *prevTask = hTask;
 133     nTaskCount++;
 134 }
 135
 136
 137 /***********************************************************************
 138  *           TASK_UnlinkTask
 139  */
 140 static void TASK_UnlinkTask( HTASK16 hTask )
 141 {
 142     HTASK16 *prevTask;
 143     TDB *pTask;
 144
 145     prevTask = &hFirstTask;
 146     while (*prevTask && (*prevTask != hTask))
 147     {
 148         pTask = TASK_GetPtr( *prevTask );
 149         prevTask = &pTask->hNext;
 150     }
 151     if (*prevTask)
 152     {
 153         pTask = TASK_GetPtr( *prevTask );
 154         *prevTask = pTask->hNext;
 155         pTask->hNext = 0;
 156         nTaskCount--;
 157     }
 158 }
 159
 160
 161 /***********************************************************************
 162  *           TASK_CreateThunks
 163  *
 164  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 165  * and containing 'count' entries.
 166  */
 167 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 168 {
 169     int i;
 170     WORD free;
 171     THUNKS *pThunk;
 172
 173     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 174     pThunk->next = 0;
 175     pThunk->magic = THUNK_MAGIC;
 176     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 177     free = pThunk->free;
 178     for (i = 0; i < count-1; i++)
 179     {
 180         free += 8;  /* Offset of next thunk */
 181         pThunk->thunks[4*i] = free;
 182     }
 183     pThunk->thunks[4*i] = 0;  /* Last thunk */
 184 }
 185
 186
 187 /***********************************************************************
 188  *           TASK_AllocThunk
 189  *
 190  * Allocate a thunk for MakeProcInstance().
 191  */
 192 static SEGPTR TASK_AllocThunk(void)
 193 {
 194     TDB *pTask;
 195     THUNKS *pThunk;
 196     WORD sel, base;
 197
 198     if (!(pTask = TASK_GetCurrent())) return 0;
 199     sel = pTask->hCSAlias;
 200     pThunk = (THUNKS *)&pTask->thunks;
 201     base = (char *)pThunk - (char *)pTask;
 202     while (!pThunk->free)
 203     {
 204         sel = pThunk->next;
 205         if (!sel)  /* Allocate a new segment */
 206         {
 207             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 208                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 209             if (!sel) return (SEGPTR)0;
 210             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 211             pThunk->next = sel;
 212         }
 213         pThunk = (THUNKS *)GlobalLock16( sel );
 214         base = 0;
 215     }
 216     base += pThunk->free;
 217     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 218     return MAKESEGPTR( sel, base );
 219 }
 220
 221
 222 /***********************************************************************
 223  *           TASK_FreeThunk
 224  *
 225  * Free a MakeProcInstance() thunk.
 226  */
 227 static BOOL TASK_FreeThunk( SEGPTR thunk )
 228 {
 229     TDB *pTask;
 230     THUNKS *pThunk;
 231     WORD sel, base;
 232
 233     if (!(pTask = TASK_GetCurrent())) return 0;
 234     sel = pTask->hCSAlias;
 235     pThunk = (THUNKS *)&pTask->thunks;
 236     base = (char *)pThunk - (char *)pTask;
 237     while (sel && (sel != HIWORD(thunk)))
 238     {
 239         sel = pThunk->next;
 240         pThunk = (THUNKS *)GlobalLock16( sel );
 241         base = 0;
 242     }
 243     if (!sel) return FALSE;
 244     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 245     pThunk->free = LOWORD(thunk) - base;
 246     return TRUE;
 247 }
 248
 249
 250 /***********************************************************************
 251  *           TASK_Create
 252  *
 253  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 254  *       to be careful to protect global data structures. We do this
 255  *       by entering the Win16Lock while linking the task into the
 256  *       global task list.
 257  */
 258 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
 259 {
 260     HTASK16 hTask;
 261     TDB *pTask;
 262     FARPROC16 proc;
 263     char curdir[MAX_PATH];
 264     HMODULE16 hModule = pModule ? pModule->self : 0;
 265
 266       /* Allocate the task structure */
 267
 268     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 269     if (!hTask) return NULL;
 270     pTask = TASK_GetPtr( hTask );
 271     FarSetOwner16( hTask, hModule );
 272
 273     /* Fill the task structure */
 274
 275     pTask->hSelf = hTask;
 276
 277     pTask->version       = pModule ? pModule->expected_version : 0x0400;
 278     pTask->hModule       = hModule;
 279     pTask->hParent       = GetCurrentTask();
 280     pTask->magic         = TDB_MAGIC;
 281     pTask->nCmdShow      = cmdShow;
 282
 283     GetCurrentDirectoryA( sizeof(curdir), curdir );
 284     GetShortPathNameA( curdir, curdir, sizeof(curdir) );
 285     pTask->curdrive = (curdir[0] - 'A') | 0x80;
 286     lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
 287
 288       /* Create the thunks block */
 289
 290     TASK_CreateThunks( hTask, (char *)&pTask->thunks - (char *)pTask, 7 );
 291
 292       /* Copy the module name */
 293
 294     if (hModule)
 295     {
 296         char name[10];
 297         GetModuleName16( hModule, name, sizeof(name) );
 298         strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 299         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 300     }
 301
 302       /* Allocate a selector for the PDB */
 303
 304     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 305                                       hModule, WINE_LDT_FLAGS_DATA );
 306
 307       /* Fill the PDB */
 308
 309     pTask->pdb.int20 = 0x20cd;
 310     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 311     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 312     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 313     pTask->pdb.savedint22 = 0;
 314     pTask->pdb.savedint23 = 0;
 315     pTask->pdb.savedint24 = 0;
 316     pTask->pdb.fileHandlesPtr =
 317         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 318     pTask->pdb.hFileHandles = 0;
 319     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 320     /* FIXME: should we make a copy of the environment? */
 321     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 322     pTask->pdb.nbFiles        = 20;
 323
 324     /* Fill the command line */
 325
 326     if (!cmdline)
 327     {
 328         cmdline = GetCommandLineA();
 329         /* remove the first word (program name) */
 330         if (*cmdline == '"')
 331             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 332         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 333         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 334         len = strlen(cmdline);
 335     }
 336     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 337     pTask->pdb.cmdLine[0] = len;
 338     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 339     /* pTask->pdb.cmdLine[len+1] = 0; */
 340
 341     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 342
 343       /* Allocate a code segment alias for the TDB */
 344
 345     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 346                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 347
 348       /* Default DTA overwrites command line */
 349
 350     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 351
 352     /* Create scheduler event for 16-bit tasks */
 353
 354     if ( !(pTask->flags & TDBF_WIN32) )
 355         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 356
 357     if (!initial_task) initial_task = hTask;
 358
 359     return pTask;
 360 }
 361
 362
 363 /***********************************************************************
 364  *           TASK_DeleteTask
 365  */
 366 static void TASK_DeleteTask( HTASK16 hTask )
 367 {
 368     TDB *pTask;
 369     HGLOBAL16 hPDB;
 370
 371     if (!(pTask = TASK_GetPtr( hTask ))) return;
 372     hPDB = pTask->hPDB;
 373
 374     pTask->magic = 0xdead; /* invalidate signature */
 375
 376     /* Free the selector aliases */
 377
 378     GLOBAL_FreeBlock( pTask->hCSAlias );
 379     GLOBAL_FreeBlock( pTask->hPDB );
 380
 381     /* Free the task module */
 382
 383     FreeModule16( pTask->hModule );
 384
 385     /* Free the task structure itself */
 386
 387     GlobalFree16( hTask );
 388
 389     /* Free all memory used by this task (including the 32-bit stack, */
 390     /* the environment block and the thunk segments). */
 391
 392     GlobalFreeAll16( hPDB );
 393 }
 394
 395
 396 /***********************************************************************
 397  *           TASK_CreateMainTask
 398  *
 399  * Create a task for the main (32-bit) process.
 400  */
 401 void TASK_CreateMainTask(void)
 402 {
 403     TDB *pTask;
 404     STARTUPINFOA startup_info;
 405     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 406
 407     GetStartupInfoA( &startup_info );
 408     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 409     pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
 410     if (!pTask)
 411     {
 412         ERR("could not create task for main process\n");
 413         ExitProcess(1);
 414     }
 415
 416     pTask->flags        |= TDBF_WIN32;
 417     pTask->hInstance     = 0;
 418     pTask->hPrevInstance = 0;
 419     pTask->teb           = NtCurrentTeb();
 420
 421     NtCurrentTeb()->htask16 = pTask->hSelf;
 422
 423     /* Add the task to the linked list */
 424     /* (no need to get the win16 lock, we are the only thread at this point) */
 425     TASK_LinkTask( pTask->hSelf );
 426 }
 427
 428
 429 /* allocate the win16 TIB for a new 16-bit task */
 430 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
 431 {
 432     WCHAR path[MAX_PATH];
 433     WIN16_SUBSYSTEM_TIB *tib;
 434     UNICODE_STRING *curdir;
 435     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 436
 437     if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
 438     MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 439     GetLongPathNameW( path, path, MAX_PATH );
 440     if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
 441     else tib->exe_name = NULL;
 442
 443     RtlAcquirePebLock();
 444     curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 445     tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
 446     tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
 447     tib->curdir.DosPath.Buffer = tib->curdir_buffer;
 448     tib->curdir.Handle = 0;
 449     memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
 450     tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
 451     RtlReleasePebLock();
 452     return tib;
 453 }
 454
 455 /* startup routine for a new 16-bit thread */
 456 static DWORD CALLBACK task_start( LPVOID p )
 457 {
 458     TDB *pTask = (TDB *)p;
 459     DWORD ret;
 460
 461     NtCurrentTeb()->htask16 = pTask->hSelf;
 462     NtCurrentTeb()->Tib.SubSystemTib = allocate_win16_tib( pTask );
 463
 464     _EnterWin16Lock();
 465     TASK_LinkTask( pTask->hSelf );
 466     pTask->teb = NtCurrentTeb();
 467     ret = NE_StartTask();
 468     _LeaveWin16Lock();
 469     return ret;
 470 }
 471
 472
 473 /***********************************************************************
 474  *           TASK_SpawnTask
 475  *
 476  * Spawn a new 16-bit task.
 477  */
 478 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 479                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 480 {
 481     TDB *pTask;
 482
 483     if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
 484     if (!(*hThread = CreateThread( NULL, 0, task_start, pTask, 0, NULL )))
 485     {
 486         TASK_DeleteTask( pTask->hSelf );
 487         return 0;
 488     }
 489     return pTask->hSelf;
 490 }
 491
 492
 493 /***********************************************************************
 494  *           TASK_GetTaskFromThread
 495  */
 496 HTASK16 TASK_GetTaskFromThread( DWORD thread )
 497 {
 498     TDB *p = TASK_GetPtr( hFirstTask );
 499     while (p)
 500     {
 501         if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
 502         p = TASK_GetPtr( p->hNext );
 503     }
 504     return 0;
 505 }
 506
 507
 508 /***********************************************************************
 509  *           TASK_CallTaskSignalProc
 510  */
 511 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
 512 {
 513     WORD args[5];
 514     TDB *pTask = TASK_GetCurrent();
 515
 516     if ( !pTask || !pTask->userhandler ) return;
 517
 518     args[4] = hTaskOrModule;
 519     args[3] = uCode;
 520     args[2] = 0;
 521     args[1] = pTask->hInstance;
 522     args[0] = pTask->hQueue;
 523     WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
 524 }
 525
 526
 527 /***********************************************************************
 528  *           TASK_ExitTask
 529  */
 530 void TASK_ExitTask(void)
 531 {
 532     WIN16_SUBSYSTEM_TIB *tib;
 533     TDB *pTask;
 534     DWORD lockCount;
 535
 536     /* Enter the Win16Lock to protect global data structures */
 537     _EnterWin16Lock();
 538
 539     pTask = TASK_GetCurrent();
 540     if ( !pTask )
 541     {
 542         _LeaveWin16Lock();
 543         return;
 544     }
 545
 546     TRACE("Killing task %04x\n", pTask->hSelf );
 547
 548     /* Perform USER cleanup */
 549
 550     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 551
 552     /* Remove the task from the list to be sure we never switch back to it */
 553     TASK_UnlinkTask( pTask->hSelf );
 554
 555     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 556     {
 557         TRACE("this is the last task, exiting\n" );
 558         ExitKernel16();
 559     }
 560
 561     pTask->nEvents = 0;
 562
 563     if ( hLockedTask == pTask->hSelf )
 564         hLockedTask = 0;
 565
 566     TASK_DeleteTask( pTask->hSelf );
 567
 568     if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
 569     {
 570         if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
 571         HeapFree( GetProcessHeap(), 0, tib );
 572         NtCurrentTeb()->Tib.SubSystemTib = NULL;
 573     }
 574
 575     /* ... and completely release the Win16Lock, just in case. */
 576     ReleaseThunkLock( &lockCount );
 577 }
 578
 579
 580 /***********************************************************************
 581  *           ExitKernel (KERNEL.2)
 582  *
 583  * Clean-up everything and exit the Wine process.
 584  */
 585 void WINAPI ExitKernel16(void)
 586 {
 587     WriteOutProfiles16();
 588     TerminateProcess( GetCurrentProcess(), 0 );
 589 }
 590
 591
 592 /***********************************************************************
 593  *           InitTask  (KERNEL.91)
 594  *
 595  * Called by the application startup code.
 596  */
 597 void WINAPI InitTask16( CONTEXT86 *context )
 598 {
 599     TDB *pTask;
 600     INSTANCEDATA *pinstance;
 601     SEGPTR ptr;
 602
 603     context->Eax = 0;
 604     if (!(pTask = TASK_GetCurrent())) return;
 605
 606     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 607        as some apps, notably Visual Basic apps, *modify* the heap/stack
 608        size of the instance data segment before calling InitTask() */
 609
 610     /* Initialize the INSTANCEDATA structure */
 611     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 612     pinstance->stackmin    = OFFSETOF( NtCurrentTeb()->cur_stack ) + sizeof( STACK16FRAME );
 613     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 614     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 615                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 616
 617     /* Initialize the local heap */
 618     if (LOWORD(context->Ecx))
 619         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 620
 621     /* Initialize implicitly loaded DLLs */
 622     NE_InitializeDLLs( pTask->hModule );
 623     NE_DllProcessAttach( pTask->hModule );
 624
 625     /* Registers on return are:
 626      * ax     1 if OK, 0 on error
 627      * cx     stack limit in bytes
 628      * dx     cmdShow parameter
 629      * si     instance handle of the previous instance
 630      * di     instance handle of the new task
 631      * es:bx  pointer to command line inside PSP
 632      *
 633      * 0 (=%bp) is pushed on the stack
 634      */
 635     ptr = stack16_push( sizeof(WORD) );
 636     *(WORD *)MapSL(ptr) = 0;
 637     context->Esp -= 2;
 638
 639     context->Eax = 1;
 640
 641     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 642     else
 643     {
 644         LPBYTE p = &pTask->pdb.cmdLine[1];
 645         while ((*p == ' ') || (*p == '\t')) p++;
 646         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 647     }
 648     context->Ecx   = pinstance->stacktop;
 649     context->Edx   = pTask->nCmdShow;
 650     context->Esi   = (DWORD)pTask->hPrevInstance;
 651     context->Edi   = (DWORD)pTask->hInstance;
 652     context->SegEs = (WORD)pTask->hPDB;
 653 }
 654
 655
 656 /***********************************************************************
 657  *           WaitEvent  (KERNEL.30)
 658  */
 659 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 660 {
 661     TDB *pTask;
 662
 663     if (!hTask) hTask = GetCurrentTask();
 664     pTask = TASK_GetPtr( hTask );
 665
 666     if (pTask->flags & TDBF_WIN32)
 667     {
 668         FIXME("called for Win32 thread (%04lx)!\n", GetCurrentThreadId());
 669         return TRUE;
 670     }
 671
 672     if (pTask->nEvents > 0)
 673     {
 674         pTask->nEvents--;
 675         return FALSE;
 676     }
 677
 678     if (pTask->teb == NtCurrentTeb())
 679     {
 680         DWORD lockCount;
 681
 682         NtResetEvent( pTask->hEvent, NULL );
 683         ReleaseThunkLock( &lockCount );
 684         SYSLEVEL_CheckNotLevel( 1 );
 685         WaitForSingleObject( pTask->hEvent, INFINITE );
 686         RestoreThunkLock( lockCount );
 687         if (pTask->nEvents > 0) pTask->nEvents--;
 688     }
 689     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 690
 691     return TRUE;
 692 }
 693
 694
 695 /***********************************************************************
 696  *           PostEvent  (KERNEL.31)
 697  */
 698 void WINAPI PostEvent16( HTASK16 hTask )
 699 {
 700     TDB *pTask;
 701
 702     if (!hTask) hTask = GetCurrentTask();
 703     if (!(pTask = TASK_GetPtr( hTask ))) return;
 704
 705     if (pTask->flags & TDBF_WIN32)
 706     {
 707         FIXME("called for Win32 thread (%04lx)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
 708         return;
 709     }
 710
 711     pTask->nEvents++;
 712
 713     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 714 }
 715
 716
 717 /***********************************************************************
 718  *           SetPriority  (KERNEL.32)
 719  */
 720 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 721 {
 722     TDB *pTask;
 723     INT16 newpriority;
 724
 725     if (!hTask) hTask = GetCurrentTask();
 726     if (!(pTask = TASK_GetPtr( hTask ))) return;
 727     newpriority = pTask->priority + delta;
 728     if (newpriority < -32) newpriority = -32;
 729     else if (newpriority > 15) newpriority = 15;
 730
 731     pTask->priority = newpriority + 1;
 732     TASK_UnlinkTask( pTask->hSelf );
 733     TASK_LinkTask( pTask->hSelf );
 734     pTask->priority--;
 735 }
 736
 737
 738 /***********************************************************************
 739  *           LockCurrentTask  (KERNEL.33)
 740  */
 741 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 742 {
 743     if (bLock) hLockedTask = GetCurrentTask();
 744     else hLockedTask = 0;
 745     return hLockedTask;
 746 }
 747
 748
 749 /***********************************************************************
 750  *           IsTaskLocked  (KERNEL.122)
 751  */
 752 HTASK16 WINAPI IsTaskLocked16(void)
 753 {
 754     return hLockedTask;
 755 }
 756
 757
 758 /***********************************************************************
 759  *           OldYield  (KERNEL.117)
 760  */
 761 void WINAPI OldYield16(void)
 762 {
 763    DWORD count;
 764
 765    ReleaseThunkLock(&count);
 766    RestoreThunkLock(count);
 767 }
 768
 769 /***********************************************************************
 770  *           WIN32_OldYield  (KERNEL.447)
 771  */
 772 void WINAPI WIN32_OldYield16(void)
 773 {
 774    DWORD count;
 775
 776    ReleaseThunkLock(&count);
 777    RestoreThunkLock(count);
 778 }
 779
 780 /***********************************************************************
 781  *           DirectedYield  (KERNEL.150)
 782  */
 783 void WINAPI DirectedYield16( HTASK16 hTask )
 784 {
 785     OldYield16();
 786 }
 787
 788 /***********************************************************************
 789  *           Yield  (KERNEL.29)
 790  */
 791 void WINAPI Yield16(void)
 792 {
 793     TDB *pCurTask = TASK_GetCurrent();
 794
 795     if (pCurTask && pCurTask->hQueue)
 796     {
 797         HMODULE mod = GetModuleHandleA( "user32.dll" );
 798         if (mod)
 799         {
 800             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 801             if (proc)
 802             {
 803                 proc();
 804                 return;
 805             }
 806         }
 807     }
 808     OldYield16();
 809 }
 810
 811 /***********************************************************************
 812  *           KERNEL_490  (KERNEL.490)
 813  */
 814 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 815 {
 816     if ( !someTask ) return 0;
 817
 818     FIXME("(%04x): stub\n", someTask );
 819     return 0;
 820 }
 821
 822 /***********************************************************************
 823  *           MakeProcInstance  (KERNEL.51)
 824  */
 825 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 826 {
 827     BYTE *thunk,*lfunc;
 828     SEGPTR thunkaddr;
 829     WORD hInstanceSelector;
 830
 831     hInstanceSelector = GlobalHandleToSel16(hInstance);
 832
 833     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 834
 835     if (!HIWORD(func)) {
 836       /* Win95 actually protects via SEH, but this is better for debugging */
 837       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 838       return (FARPROC16)0;
 839     }
 840
 841     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 842       && (hInstance != 0)
 843       && (hInstance != 0xffff) )
 844     {
 845         /* calling MPI with a foreign DSEG is invalid ! */
 846         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 847                    hInstance,CURRENT_DS);
 848     }
 849
 850     /* Always use the DSEG that MPI was entered with.
 851      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 852      * as CURRENT_DS provides the DSEG value we need.
 853      * ("calling" DS, *not* "task" DS !) */
 854     hInstanceSelector = CURRENT_DS;
 855     hInstance = GlobalHandle16(hInstanceSelector);
 856
 857     /* no thunking for DLLs */
 858     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 859         return func;
 860
 861     thunkaddr = TASK_AllocThunk();
 862     if (!thunkaddr) return (FARPROC16)0;
 863     thunk = MapSL( thunkaddr );
 864     lfunc = MapSL( (SEGPTR)func );
 865
 866     TRACE("(%08lx,%04x): got thunk %08lx\n",
 867           (DWORD)func, hInstance, (DWORD)thunkaddr );
 868     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 869         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 870     ) {
 871         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 872     }
 873
 874     *thunk++ = 0xb8;    /* movw instance, %ax */
 875     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 876     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 877     *thunk++ = 0xea;    /* ljmp func */
 878     *(DWORD *)thunk = (DWORD)func;
 879     return (FARPROC16)thunkaddr;
 880     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 881 }
 882
 883
 884 /***********************************************************************
 885  *           FreeProcInstance  (KERNEL.52)
 886  */
 887 void WINAPI FreeProcInstance16( FARPROC16 func )
 888 {
 889     TRACE("(%08lx)\n", (DWORD)func );
 890     TASK_FreeThunk( (SEGPTR)func );
 891 }
 892
 893 /**********************************************************************
 894  *          TASK_GetCodeSegment
 895  *
 896  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 897  * and logical segment number of a given code segment.
 898  *
 899  * 'proc' either *is* already a pair of module handle and segment number,
 900  * in which case there's nothing to do.  Otherwise, it is a pointer to
 901  * a function, and we need to retrieve the code segment.  If the pointer
 902  * happens to point to a thunk, we'll retrieve info about the code segment
 903  * where the function pointed to by the thunk resides, not the thunk itself.
 904  *
 905  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 906  *        the function the snoop code will return to ...
 907  *
 908  */
 909 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 910                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 911 {
 912     NE_MODULE *pModule = NULL;
 913     SEGTABLEENTRY *pSeg = NULL;
 914     int segNr=0;
 915
 916     /* Try pair of module handle / segment number */
 917     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 918     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 919     {
 920         segNr = LOWORD( proc );
 921         if ( segNr && segNr <= pModule->seg_count )
 922             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 923     }
 924
 925     /* Try thunk or function */
 926     else
 927     {
 928         BYTE *thunk = MapSL( (SEGPTR)proc );
 929         WORD selector;
 930
 931         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 932             selector = thunk[6] + (thunk[7] << 8);
 933         else
 934             selector = HIWORD( proc );
 935
 936         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 937         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 938
 939         if ( pModule )
 940             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 941                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 942                     break;
 943
 944         if ( pModule && segNr > pModule->seg_count )
 945             pSeg = NULL;
 946     }
 947
 948     /* Abort if segment not found */
 949
 950     if ( !pModule || !pSeg )
 951         return FALSE;
 952
 953     /* Return segment data */
 954
 955     if ( ppModule ) *ppModule = pModule;
 956     if ( ppSeg    ) *ppSeg    = pSeg;
 957     if ( pSegNr   ) *pSegNr   = segNr;
 958
 959     return TRUE;
 960 }
 961
 962 /**********************************************************************
 963  *          GetCodeHandle    (KERNEL.93)
 964  */
 965 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 966 {
 967     SEGTABLEENTRY *pSeg;
 968
 969     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 970         return (HANDLE16)0;
 971
 972     return pSeg->hSeg;
 973 }
 974
 975 /**********************************************************************
 976  *          GetCodeInfo    (KERNEL.104)
 977  */
 978 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 979 {
 980     NE_MODULE *pModule;
 981     SEGTABLEENTRY *pSeg;
 982     int segNr;
 983
 984     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 985         return FALSE;
 986
 987     /* Fill in segment information */
 988
 989     segInfo->offSegment = pSeg->filepos;
 990     segInfo->cbSegment  = pSeg->size;
 991     segInfo->flags      = pSeg->flags;
 992     segInfo->cbAlloc    = pSeg->minsize;
 993     segInfo->h          = pSeg->hSeg;
 994     segInfo->alignShift = pModule->alignment;
 995
 996     if ( segNr == pModule->dgroup )
 997         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
 998
 999     /* Return module handle in %es */
1000
1001     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1002
1003     return TRUE;
1004 }
1005
1006
1007 /**********************************************************************
1008  *          DefineHandleTable    (KERNEL.94)
1009  */
1010 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1011 {
1012     FIXME("(%04x): stub ?\n", wOffset);
1013     return TRUE;
1014 }
1015
1016
1017 /***********************************************************************
1018  *           SetTaskQueue  (KERNEL.34)
1019  */
1020 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1021 {
1022     HQUEUE16 hPrev;
1023     TDB *pTask;
1024
1025     if (!hTask) hTask = GetCurrentTask();
1026     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1027
1028     hPrev = pTask->hQueue;
1029     pTask->hQueue = hQueue;
1030
1031     return hPrev;
1032 }
1033
1034
1035 /***********************************************************************
1036  *           GetTaskQueue  (KERNEL.35)
1037  */
1038 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1039 {
1040     TDB *pTask;
1041
1042     if (!hTask) hTask = GetCurrentTask();
1043     if (!(pTask = TASK_GetPtr( hTask ))) return 0;
1044     return pTask->hQueue;
1045 }
1046
1047 /***********************************************************************
1048  *           SetThreadQueue  (KERNEL.463)
1049  */
1050 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1051 {
1052     HQUEUE16 oldQueue = NtCurrentTeb()->queue;
1053
1054     if (thread && thread != GetCurrentThreadId())
1055     {
1056         FIXME( "not supported on other thread %04lx\n", thread );
1057         return 0;
1058     }
1059     NtCurrentTeb()->queue = hQueue;
1060     if ( GetTaskQueue16( NtCurrentTeb()->htask16 ) == oldQueue )
1061         SetTaskQueue16( NtCurrentTeb()->htask16, hQueue );
1062     return oldQueue;
1063 }
1064
1065 /***********************************************************************
1066  *           GetThreadQueue  (KERNEL.464)
1067  */
1068 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1069 {
1070     if (thread && thread != GetCurrentThreadId())
1071     {
1072         FIXME( "not supported on other thread %04lx\n", thread );
1073         return 0;
1074     }
1075     return NtCurrentTeb()->queue;
1076 }
1077
1078 /***********************************************************************
1079  *           SetFastQueue  (KERNEL.624)
1080  */
1081 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1082 {
1083     if (!thread || thread == GetCurrentThreadId())
1084         NtCurrentTeb()->queue = hQueue;
1085     else
1086         FIXME( "not supported on other thread %04lx\n", thread );
1087 }
1088
1089 /***********************************************************************
1090  *           GetFastQueue  (KERNEL.625)
1091  */
1092 HQUEUE16 WINAPI GetFastQueue16( void )
1093 {
1094     HQUEUE16 ret = NtCurrentTeb()->queue;
1095
1096     if (!ret) FIXME("(): should initialize thread-local queue, expect failure!\n" );
1097     return ret;
1098 }
1099
1100 /***********************************************************************
1101  *           SwitchStackTo   (KERNEL.108)
1102  */
1103 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1104 {
1105     STACK16FRAME *oldFrame, *newFrame;
1106     INSTANCEDATA *pData;
1107     UINT16 copySize;
1108
1109     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1110     TRACE("old=%04x:%04x new=%04x:%04x\n",
1111           SELECTOROF( NtCurrentTeb()->cur_stack ),
1112           OFFSETOF( NtCurrentTeb()->cur_stack ), seg, ptr );
1113
1114     /* Save the old stack */
1115
1116     oldFrame = CURRENT_STACK16;
1117     /* pop frame + args and push bp */
1118     pData->old_ss_sp   = NtCurrentTeb()->cur_stack + sizeof(STACK16FRAME)
1119                            + 2 * sizeof(WORD);
1120     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1121     pData->stacktop    = top;
1122     pData->stackmin    = ptr;
1123     pData->stackbottom = ptr;
1124
1125     /* Switch to the new stack */
1126
1127     /* Note: we need to take the 3 arguments into account; otherwise,
1128      * the stack will underflow upon return from this function.
1129      */
1130     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1131     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1132     NtCurrentTeb()->cur_stack = MAKESEGPTR( seg, ptr - copySize );
1133     newFrame = CURRENT_STACK16;
1134
1135     /* Copy the stack frame and the local variables to the new stack */
1136
1137     memmove( newFrame, oldFrame, copySize );
1138     newFrame->bp = ptr;
1139     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1140 }
1141
1142
1143 /***********************************************************************
1144  *           SwitchStackBack   (KERNEL.109)
1145  */
1146 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1147 {
1148     STACK16FRAME *oldFrame, *newFrame;
1149     INSTANCEDATA *pData;
1150
1151     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->cur_stack))))
1152         return;
1153     if (!pData->old_ss_sp)
1154     {
1155         WARN("No previous SwitchStackTo\n" );
1156         return;
1157     }
1158     TRACE("restoring stack %04x:%04x\n",
1159           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1160
1161     oldFrame = CURRENT_STACK16;
1162
1163     /* Pop bp from the previous stack */
1164
1165     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1166     pData->old_ss_sp += sizeof(WORD);
1167
1168     /* Switch back to the old stack */
1169
1170     NtCurrentTeb()->cur_stack = pData->old_ss_sp - sizeof(STACK16FRAME);
1171     context->SegSs = SELECTOROF(pData->old_ss_sp);
1172     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1173     pData->old_ss_sp = 0;
1174
1175     /* Build a stack frame for the return */
1176
1177     newFrame = CURRENT_STACK16;
1178     newFrame->frame32     = oldFrame->frame32;
1179     newFrame->module_cs   = oldFrame->module_cs;
1180     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1181     newFrame->entry_ip    = oldFrame->entry_ip;
1182 }
1183
1184
1185 /***********************************************************************
1186  *           GetTaskQueueDS  (KERNEL.118)
1187  */
1188 void WINAPI GetTaskQueueDS16(void)
1189 {
1190     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1191 }
1192
1193
1194 /***********************************************************************
1195  *           GetTaskQueueES  (KERNEL.119)
1196  */
1197 void WINAPI GetTaskQueueES16(void)
1198 {
1199     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1200 }
1201
1202
1203 /***********************************************************************
1204  *           GetCurrentTask   (KERNEL32.@)
1205  */
1206 HTASK16 WINAPI GetCurrentTask(void)
1207 {
1208     return NtCurrentTeb()->htask16;
1209 }
1210
1211 /***********************************************************************
1212  *           GetCurrentTask   (KERNEL.36)
1213  */
1214 DWORD WINAPI WIN16_GetCurrentTask(void)
1215 {
1216     /* This is the version used by relay code; the first task is */
1217     /* returned in the high word of the result */
1218     return MAKELONG( GetCurrentTask(), hFirstTask );
1219 }
1220
1221
1222 /***********************************************************************
1223  *           GetCurrentPDB   (KERNEL.37)
1224  *
1225  * UNDOC: returns PSP of KERNEL in high word
1226  */
1227 DWORD WINAPI GetCurrentPDB16(void)
1228 {
1229     TDB *pTask;
1230
1231     if (!(pTask = TASK_GetCurrent())) return 0;
1232     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1233 }
1234
1235
1236 /***********************************************************************
1237  *           GetCurPID   (KERNEL.157)
1238  */
1239 DWORD WINAPI GetCurPID16( DWORD unused )
1240 {
1241     return 0;
1242 }
1243
1244
1245 /***********************************************************************
1246  *           GetInstanceData   (KERNEL.54)
1247  */
1248 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1249 {
1250     char *ptr = (char *)GlobalLock16( instance );
1251     if (!ptr || !len) return 0;
1252     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1253     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1254     return len;
1255 }
1256
1257
1258 /***********************************************************************
1259  *           GetExeVersion   (KERNEL.105)
1260  */
1261 WORD WINAPI GetExeVersion16(void)
1262 {
1263     TDB *pTask;
1264
1265     if (!(pTask = TASK_GetCurrent())) return 0;
1266     return pTask->version;
1267 }
1268
1269
1270 /***********************************************************************
1271  *           SetErrorMode   (KERNEL.107)
1272  */
1273 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1274 {
1275     TDB *pTask;
1276     if (!(pTask = TASK_GetCurrent())) return 0;
1277     pTask->error_mode = mode;
1278     return SetErrorMode( mode );
1279 }
1280
1281
1282 /***********************************************************************
1283  *           GetNumTasks   (KERNEL.152)
1284  */
1285 UINT16 WINAPI GetNumTasks16(void)
1286 {
1287     return nTaskCount;
1288 }
1289
1290
1291 /***********************************************************************
1292  *           GetTaskDS   (KERNEL.155)
1293  *
1294  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1295  * I don't think we need to bother with this.
1296  */
1297 HINSTANCE16 WINAPI GetTaskDS16(void)
1298 {
1299     TDB *pTask;
1300
1301     if (!(pTask = TASK_GetCurrent())) return 0;
1302     return GlobalHandleToSel16(pTask->hInstance);
1303 }
1304
1305 /***********************************************************************
1306  *           GetDummyModuleHandleDS   (KERNEL.602)
1307  */
1308 WORD WINAPI GetDummyModuleHandleDS16(void)
1309 {
1310     TDB *pTask;
1311     WORD selector;
1312
1313     if (!(pTask = TASK_GetCurrent())) return 0;
1314     if (!(pTask->flags & TDBF_WIN32)) return 0;
1315     selector = GlobalHandleToSel16( pTask->hModule );
1316     CURRENT_DS = selector;
1317     return selector;
1318 }
1319
1320 /***********************************************************************
1321  *           IsTask   (KERNEL.320)
1322  */
1323 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1324 {
1325     TDB *pTask;
1326
1327     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1328     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1329     return (pTask->magic == TDB_MAGIC);
1330 }
1331
1332
1333 /***********************************************************************
1334  *           IsWinOldApTask   (KERNEL.158)
1335  */
1336 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1337 {
1338     /* should return bit 0 of byte 0x48 in PSP */
1339     return FALSE;
1340 }
1341
1342 /***********************************************************************
1343  *           SetTaskSignalProc   (KERNEL.38)
1344  */
1345 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1346 {
1347     TDB *pTask;
1348     FARPROC16 oldProc;
1349
1350     if (!hTask) hTask = GetCurrentTask();
1351     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1352     oldProc = pTask->userhandler;
1353     pTask->userhandler = proc;
1354     return oldProc;
1355 }
1356
1357 /***********************************************************************
1358  *           SetSigHandler   (KERNEL.140)
1359  */
1360 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1361                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1362 {
1363     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1364           newhandler,oldhandler,oldmode,newmode,flag );
1365
1366     if (flag != 1) return 0;
1367     if (!newmode) newhandler = NULL;  /* Default handler */
1368     if (newmode != 4)
1369     {
1370         TDB *pTask;
1371
1372         if (!(pTask = TASK_GetCurrent())) return 0;
1373         if (oldmode) *oldmode = pTask->signal_flags;
1374         pTask->signal_flags = newmode;
1375         if (oldhandler) *oldhandler = pTask->sighandler;
1376         pTask->sighandler = newhandler;
1377     }
1378     return 0;
1379 }
1380
1381
1382 /***********************************************************************
1383  *           GlobalNotify   (KERNEL.154)
1384  *
1385  * Note that GlobalNotify does _not_ return the old NotifyProc
1386  * -- contrary to LocalNotify !!
1387  */
1388 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1389 {
1390     TDB *pTask;
1391
1392     if (!(pTask = TASK_GetCurrent())) return;
1393     pTask->discardhandler = proc;
1394 }
1395
1396
1397 /***********************************************************************
1398  *           GetExePtrHelper
1399  */
1400 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1401 {
1402     char *ptr;
1403     HANDLE16 owner;
1404
1405       /* Check for module handle */
1406
1407     if (!(ptr = GlobalLock16( handle ))) return 0;
1408     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1409
1410       /* Search for this handle inside all tasks */
1411
1412     *hTask = hFirstTask;
1413     while (*hTask)
1414     {
1415         TDB *pTask = TASK_GetPtr( *hTask );
1416         if ((*hTask == handle) ||
1417             (pTask->hInstance == handle) ||
1418             (pTask->hQueue == handle) ||
1419             (pTask->hPDB == handle)) return pTask->hModule;
1420         *hTask = pTask->hNext;
1421     }
1422
1423       /* Check the owner for module handle */
1424
1425     owner = FarGetOwner16( handle );
1426     if (!(ptr = GlobalLock16( owner ))) return 0;
1427     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1428
1429       /* Search for the owner inside all tasks */
1430
1431     *hTask = hFirstTask;
1432     while (*hTask)
1433     {
1434         TDB *pTask = TASK_GetPtr( *hTask );
1435         if ((*hTask == owner) ||
1436             (pTask->hInstance == owner) ||
1437             (pTask->hQueue == owner) ||
1438             (pTask->hPDB == owner)) return pTask->hModule;
1439         *hTask = pTask->hNext;
1440     }
1441
1442     return 0;
1443 }
1444
1445 /***********************************************************************
1446  *           GetExePtr   (KERNEL.133)
1447  */
1448 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1449 {
1450     HTASK16 hTask = 0;
1451     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1452     STACK16FRAME *frame = CURRENT_STACK16;
1453     frame->ecx = hModule;
1454     if (hTask) frame->es = hTask;
1455     return hModule;
1456 }
1457
1458
1459 /***********************************************************************
1460  *           K228   (KERNEL.228)
1461  */
1462 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1463 {
1464     HTASK16 hTask = 0;
1465     return GetExePtrHelper( handle, &hTask );
1466 }
1467
1468
1469 /***********************************************************************
1470  *           TaskFirst   (TOOLHELP.63)
1471  */
1472 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1473 {
1474     lpte->hNext = hFirstTask;
1475     return TaskNext16( lpte );
1476 }
1477
1478
1479 /***********************************************************************
1480  *           TaskNext   (TOOLHELP.64)
1481  */
1482 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1483 {
1484     TDB *pTask;
1485     INSTANCEDATA *pInstData;
1486
1487     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1488     if (!lpte->hNext) return FALSE;
1489
1490     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1491     while (1) {
1492         pTask = TASK_GetPtr( lpte->hNext );
1493         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1494         if (pTask->hInstance)
1495             break;
1496         lpte->hNext = pTask->hNext;
1497     }
1498     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1499     lpte->hTask         = lpte->hNext;
1500     lpte->hTaskParent   = pTask->hParent;
1501     lpte->hInst         = pTask->hInstance;
1502     lpte->hModule       = pTask->hModule;
1503     lpte->wSS           = SELECTOROF( pTask->teb->cur_stack );
1504     lpte->wSP           = OFFSETOF( pTask->teb->cur_stack );
1505     lpte->wStackTop     = pInstData->stacktop;
1506     lpte->wStackMinimum = pInstData->stackmin;
1507     lpte->wStackBottom  = pInstData->stackbottom;
1508     lpte->wcEvents      = pTask->nEvents;
1509     lpte->hQueue        = pTask->hQueue;
1510     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1511     lpte->wPSPOffset    = 0x100;  /*??*/
1512     lpte->hNext         = pTask->hNext;
1513     return TRUE;
1514 }
1515
1516
1517 /***********************************************************************
1518  *           TaskFindHandle   (TOOLHELP.65)
1519  */
1520 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1521 {
1522     lpte->hNext = hTask;
1523     return TaskNext16( lpte );
1524 }
1525
1526
1527 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1528
1529 /**************************************************************************
1530  *           FatalAppExit   (KERNEL.137)
1531  */
1532 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1533 {
1534     TDB *pTask = TASK_GetCurrent();
1535
1536     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1537     {
1538         HMODULE mod = GetModuleHandleA( "user32.dll" );
1539         if (mod)
1540         {
1541             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1542             if (pMessageBoxA)
1543             {
1544                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1545                 goto done;
1546             }
1547         }
1548         ERR( "%s\n", debugstr_a(str) );
1549     }
1550  done:
1551     ExitThread(0xff);
1552 }
1553
1554
1555 /***********************************************************************
1556  *           TerminateApp   (TOOLHELP.77)
1557  *
1558  * See "Undocumented Windows".
1559  */
1560 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1561 {
1562     if (hTask && hTask != GetCurrentTask())
1563     {
1564         FIXME("cannot terminate task %x\n", hTask);
1565         return;
1566     }
1567
1568     if (wFlags & NO_UAE_BOX)
1569     {
1570         UINT16 old_mode;
1571         old_mode = SetErrorMode16(0);
1572         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1573     }
1574     FatalAppExit16( 0, NULL );
1575
1576     /* hmm, we're still alive ?? */
1577
1578     /* check undocumented flag */
1579     if (!(wFlags & 0x8000))
1580         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1581
1582     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1583        but let's just call ExitThread */
1584     ExitThread(0xff);
1585 }
1586
1587
1588 /***********************************************************************
1589  *           GetAppCompatFlags   (KERNEL.354)
1590  */
1591 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1592 {
1593     TDB *pTask;
1594
1595     if (!hTask) hTask = GetCurrentTask();
1596     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1597     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1598     return pTask->compat_flags;
1599 }
1600
1601
1602 /***********************************************************************
1603  *           GetDOSEnvironment     (KERNEL.131)
1604  *
1605  * Note: the environment is allocated once, it doesn't track changes
1606  * made using the Win32 API. This shouldn't matter.
1607  *
1608  * Format of a 16-bit environment block:
1609  * ASCIIZ   string 1 (xx=yy format)
1610  * ...
1611  * ASCIIZ   string n
1612  * BYTE     0
1613  * WORD     1
1614  * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1615  */
1616 SEGPTR WINAPI GetDOSEnvironment16(void)
1617 {
1618     static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1619     static HGLOBAL16 handle;  /* handle to the 16 bit environment */
1620
1621     if (!handle)
1622     {
1623         DWORD size;
1624         LPSTR p, env;
1625
1626         p = env = GetEnvironmentStringsA();
1627         while (*p) p += strlen(p) + 1;
1628         p++;  /* skip last null */
1629         size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1630         handle = GlobalAlloc16( GMEM_FIXED, size );
1631         if (handle)
1632         {
1633             WORD one = 1;
1634             LPSTR env16 = GlobalLock16( handle );
1635             memcpy( env16, env, p - env );
1636             memcpy( env16 + (p - env), &one, sizeof(one));
1637             memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1638             GlobalUnlock16( handle );
1639         }
1640         FreeEnvironmentStringsA( env );
1641     }
1642     return K32WOWGlobalLock16( handle );
1643 }