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[sizeof(pTask->module_name)+1];
 297         size_t len;
 298         GetModuleName16( hModule, name, sizeof(name) );
 299         len = strlen(name) + 1;
 300         memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
 301         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 302     }
 303
 304       /* Allocate a selector for the PDB */
 305
 306     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 307                                       hModule, WINE_LDT_FLAGS_DATA );
 308
 309       /* Fill the PDB */
 310
 311     pTask->pdb.int20 = 0x20cd;
 312     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 313     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 314     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 315     pTask->pdb.savedint22 = 0;
 316     pTask->pdb.savedint23 = 0;
 317     pTask->pdb.savedint24 = 0;
 318     pTask->pdb.fileHandlesPtr =
 319         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 320     pTask->pdb.hFileHandles = 0;
 321     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 322     /* FIXME: should we make a copy of the environment? */
 323     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 324     pTask->pdb.nbFiles        = 20;
 325
 326     /* Fill the command line */
 327
 328     if (!cmdline)
 329     {
 330         cmdline = GetCommandLineA();
 331         /* remove the first word (program name) */
 332         if (*cmdline == '"')
 333             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 334         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 335         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 336         len = strlen(cmdline);
 337     }
 338     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 339     pTask->pdb.cmdLine[0] = len;
 340     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 341     /* pTask->pdb.cmdLine[len+1] = 0; */
 342
 343     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 344
 345       /* Allocate a code segment alias for the TDB */
 346
 347     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 348                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 349
 350       /* Default DTA overwrites command line */
 351
 352     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 353
 354     /* Create scheduler event for 16-bit tasks */
 355
 356     if ( !(pTask->flags & TDBF_WIN32) )
 357         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 358
 359     if (!initial_task) initial_task = hTask;
 360
 361     return pTask;
 362 }
 363
 364
 365 /***********************************************************************
 366  *           TASK_DeleteTask
 367  */
 368 static void TASK_DeleteTask( HTASK16 hTask )
 369 {
 370     TDB *pTask;
 371     HGLOBAL16 hPDB;
 372
 373     if (!(pTask = TASK_GetPtr( hTask ))) return;
 374     hPDB = pTask->hPDB;
 375
 376     pTask->magic = 0xdead; /* invalidate signature */
 377
 378     /* Free the selector aliases */
 379
 380     GLOBAL_FreeBlock( pTask->hCSAlias );
 381     GLOBAL_FreeBlock( pTask->hPDB );
 382
 383     /* Free the task module */
 384
 385     FreeModule16( pTask->hModule );
 386
 387     /* Free the task structure itself */
 388
 389     GlobalFree16( hTask );
 390
 391     /* Free all memory used by this task (including the 32-bit stack, */
 392     /* the environment block and the thunk segments). */
 393
 394     GlobalFreeAll16( hPDB );
 395 }
 396
 397
 398 /***********************************************************************
 399  *           TASK_CreateMainTask
 400  *
 401  * Create a task for the main (32-bit) process.
 402  */
 403 void TASK_CreateMainTask(void)
 404 {
 405     TDB *pTask;
 406     STARTUPINFOA startup_info;
 407     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 408
 409     GetStartupInfoA( &startup_info );
 410     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 411     pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
 412     if (!pTask)
 413     {
 414         ERR("could not create task for main process\n");
 415         ExitProcess(1);
 416     }
 417
 418     pTask->flags        |= TDBF_WIN32;
 419     pTask->hInstance     = 0;
 420     pTask->hPrevInstance = 0;
 421     pTask->teb           = NtCurrentTeb();
 422
 423     NtCurrentTeb()->htask16 = pTask->hSelf;
 424
 425     /* Add the task to the linked list */
 426     /* (no need to get the win16 lock, we are the only thread at this point) */
 427     TASK_LinkTask( pTask->hSelf );
 428 }
 429
 430
 431 /* allocate the win16 TIB for a new 16-bit task */
 432 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
 433 {
 434     WCHAR path[MAX_PATH];
 435     WIN16_SUBSYSTEM_TIB *tib;
 436     UNICODE_STRING *curdir;
 437     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 438
 439     if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
 440     MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 441     GetLongPathNameW( path, path, MAX_PATH );
 442     if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
 443     else tib->exe_name = NULL;
 444
 445     RtlAcquirePebLock();
 446     curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 447     tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
 448     tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
 449     tib->curdir.DosPath.Buffer = tib->curdir_buffer;
 450     tib->curdir.Handle = 0;
 451     memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
 452     tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
 453     RtlReleasePebLock();
 454     return tib;
 455 }
 456
 457 /* startup routine for a new 16-bit thread */
 458 static DWORD CALLBACK task_start( LPVOID p )
 459 {
 460     TDB *pTask = (TDB *)p;
 461     DWORD ret;
 462
 463     NtCurrentTeb()->htask16 = pTask->hSelf;
 464     NtCurrentTeb()->Tib.SubSystemTib = allocate_win16_tib( pTask );
 465
 466     _EnterWin16Lock();
 467     TASK_LinkTask( pTask->hSelf );
 468     pTask->teb = NtCurrentTeb();
 469     ret = NE_StartTask();
 470     _LeaveWin16Lock();
 471     return ret;
 472 }
 473
 474
 475 /***********************************************************************
 476  *           TASK_SpawnTask
 477  *
 478  * Spawn a new 16-bit task.
 479  */
 480 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 481                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 482 {
 483     TDB *pTask;
 484
 485     if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
 486     if (!(*hThread = CreateThread( NULL, 0, task_start, pTask, 0, NULL )))
 487     {
 488         TASK_DeleteTask( pTask->hSelf );
 489         return 0;
 490     }
 491     return pTask->hSelf;
 492 }
 493
 494
 495 /***********************************************************************
 496  *           TASK_GetTaskFromThread
 497  */
 498 HTASK16 TASK_GetTaskFromThread( DWORD thread )
 499 {
 500     TDB *p = TASK_GetPtr( hFirstTask );
 501     while (p)
 502     {
 503         if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
 504         p = TASK_GetPtr( p->hNext );
 505     }
 506     return 0;
 507 }
 508
 509
 510 /***********************************************************************
 511  *           TASK_CallTaskSignalProc
 512  */
 513 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
 514 {
 515     WORD args[5];
 516     TDB *pTask = TASK_GetCurrent();
 517
 518     if ( !pTask || !pTask->userhandler ) return;
 519
 520     args[4] = hTaskOrModule;
 521     args[3] = uCode;
 522     args[2] = 0;
 523     args[1] = pTask->hInstance;
 524     args[0] = pTask->hQueue;
 525     WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
 526 }
 527
 528
 529 /***********************************************************************
 530  *           TASK_ExitTask
 531  */
 532 void TASK_ExitTask(void)
 533 {
 534     WIN16_SUBSYSTEM_TIB *tib;
 535     TDB *pTask;
 536     DWORD lockCount;
 537
 538     /* Enter the Win16Lock to protect global data structures */
 539     _EnterWin16Lock();
 540
 541     pTask = TASK_GetCurrent();
 542     if ( !pTask )
 543     {
 544         _LeaveWin16Lock();
 545         return;
 546     }
 547
 548     TRACE("Killing task %04x\n", pTask->hSelf );
 549
 550     /* Perform USER cleanup */
 551
 552     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 553
 554     /* Remove the task from the list to be sure we never switch back to it */
 555     TASK_UnlinkTask( pTask->hSelf );
 556
 557     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 558     {
 559         TRACE("this is the last task, exiting\n" );
 560         ExitKernel16();
 561     }
 562
 563     pTask->nEvents = 0;
 564
 565     if ( hLockedTask == pTask->hSelf )
 566         hLockedTask = 0;
 567
 568     TASK_DeleteTask( pTask->hSelf );
 569
 570     if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
 571     {
 572         if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
 573         HeapFree( GetProcessHeap(), 0, tib );
 574         NtCurrentTeb()->Tib.SubSystemTib = NULL;
 575     }
 576
 577     /* ... and completely release the Win16Lock, just in case. */
 578     ReleaseThunkLock( &lockCount );
 579 }
 580
 581
 582 /***********************************************************************
 583  *           ExitKernel (KERNEL.2)
 584  *
 585  * Clean-up everything and exit the Wine process.
 586  */
 587 void WINAPI ExitKernel16(void)
 588 {
 589     WriteOutProfiles16();
 590     TerminateProcess( GetCurrentProcess(), 0 );
 591 }
 592
 593
 594 /***********************************************************************
 595  *           InitTask  (KERNEL.91)
 596  *
 597  * Called by the application startup code.
 598  */
 599 void WINAPI InitTask16( CONTEXT86 *context )
 600 {
 601     TDB *pTask;
 602     INSTANCEDATA *pinstance;
 603     SEGPTR ptr;
 604
 605     context->Eax = 0;
 606     if (!(pTask = TASK_GetCurrent())) return;
 607
 608     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 609        as some apps, notably Visual Basic apps, *modify* the heap/stack
 610        size of the instance data segment before calling InitTask() */
 611
 612     /* Initialize the INSTANCEDATA structure */
 613     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 614     pinstance->stackmin    = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + sizeof( STACK16FRAME );
 615     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 616     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 617                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 618
 619     /* Initialize the local heap */
 620     if (LOWORD(context->Ecx))
 621         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 622
 623     /* Initialize implicitly loaded DLLs */
 624     NE_InitializeDLLs( pTask->hModule );
 625     NE_DllProcessAttach( pTask->hModule );
 626
 627     /* Registers on return are:
 628      * ax     1 if OK, 0 on error
 629      * cx     stack limit in bytes
 630      * dx     cmdShow parameter
 631      * si     instance handle of the previous instance
 632      * di     instance handle of the new task
 633      * es:bx  pointer to command line inside PSP
 634      *
 635      * 0 (=%bp) is pushed on the stack
 636      */
 637     ptr = stack16_push( sizeof(WORD) );
 638     *(WORD *)MapSL(ptr) = 0;
 639     context->Esp -= 2;
 640
 641     context->Eax = 1;
 642
 643     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 644     else
 645     {
 646         LPBYTE p = &pTask->pdb.cmdLine[1];
 647         while ((*p == ' ') || (*p == '\t')) p++;
 648         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 649     }
 650     context->Ecx   = pinstance->stacktop;
 651     context->Edx   = pTask->nCmdShow;
 652     context->Esi   = (DWORD)pTask->hPrevInstance;
 653     context->Edi   = (DWORD)pTask->hInstance;
 654     context->SegEs = (WORD)pTask->hPDB;
 655 }
 656
 657
 658 /***********************************************************************
 659  *           WaitEvent  (KERNEL.30)
 660  */
 661 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 662 {
 663     TDB *pTask;
 664
 665     if (!hTask) hTask = GetCurrentTask();
 666     pTask = TASK_GetPtr( hTask );
 667
 668     if (pTask->flags & TDBF_WIN32)
 669     {
 670         FIXME("called for Win32 thread (%04lx)!\n", GetCurrentThreadId());
 671         return TRUE;
 672     }
 673
 674     if (pTask->nEvents > 0)
 675     {
 676         pTask->nEvents--;
 677         return FALSE;
 678     }
 679
 680     if (pTask->teb == NtCurrentTeb())
 681     {
 682         DWORD lockCount;
 683
 684         NtResetEvent( pTask->hEvent, NULL );
 685         ReleaseThunkLock( &lockCount );
 686         SYSLEVEL_CheckNotLevel( 1 );
 687         WaitForSingleObject( pTask->hEvent, INFINITE );
 688         RestoreThunkLock( lockCount );
 689         if (pTask->nEvents > 0) pTask->nEvents--;
 690     }
 691     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 692
 693     return TRUE;
 694 }
 695
 696
 697 /***********************************************************************
 698  *           PostEvent  (KERNEL.31)
 699  */
 700 void WINAPI PostEvent16( HTASK16 hTask )
 701 {
 702     TDB *pTask;
 703
 704     if (!hTask) hTask = GetCurrentTask();
 705     if (!(pTask = TASK_GetPtr( hTask ))) return;
 706
 707     if (pTask->flags & TDBF_WIN32)
 708     {
 709         FIXME("called for Win32 thread (%04lx)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
 710         return;
 711     }
 712
 713     pTask->nEvents++;
 714
 715     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 716 }
 717
 718
 719 /***********************************************************************
 720  *           SetPriority  (KERNEL.32)
 721  */
 722 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 723 {
 724     TDB *pTask;
 725     INT16 newpriority;
 726
 727     if (!hTask) hTask = GetCurrentTask();
 728     if (!(pTask = TASK_GetPtr( hTask ))) return;
 729     newpriority = pTask->priority + delta;
 730     if (newpriority < -32) newpriority = -32;
 731     else if (newpriority > 15) newpriority = 15;
 732
 733     pTask->priority = newpriority + 1;
 734     TASK_UnlinkTask( pTask->hSelf );
 735     TASK_LinkTask( pTask->hSelf );
 736     pTask->priority--;
 737 }
 738
 739
 740 /***********************************************************************
 741  *           LockCurrentTask  (KERNEL.33)
 742  */
 743 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 744 {
 745     if (bLock) hLockedTask = GetCurrentTask();
 746     else hLockedTask = 0;
 747     return hLockedTask;
 748 }
 749
 750
 751 /***********************************************************************
 752  *           IsTaskLocked  (KERNEL.122)
 753  */
 754 HTASK16 WINAPI IsTaskLocked16(void)
 755 {
 756     return hLockedTask;
 757 }
 758
 759
 760 /***********************************************************************
 761  *           OldYield  (KERNEL.117)
 762  */
 763 void WINAPI OldYield16(void)
 764 {
 765    DWORD count;
 766
 767    ReleaseThunkLock(&count);
 768    RestoreThunkLock(count);
 769 }
 770
 771 /***********************************************************************
 772  *           WIN32_OldYield  (KERNEL.447)
 773  */
 774 void WINAPI WIN32_OldYield16(void)
 775 {
 776    DWORD count;
 777
 778    ReleaseThunkLock(&count);
 779    RestoreThunkLock(count);
 780 }
 781
 782 /***********************************************************************
 783  *           DirectedYield  (KERNEL.150)
 784  */
 785 void WINAPI DirectedYield16( HTASK16 hTask )
 786 {
 787     OldYield16();
 788 }
 789
 790 /***********************************************************************
 791  *           Yield  (KERNEL.29)
 792  */
 793 void WINAPI Yield16(void)
 794 {
 795     TDB *pCurTask = TASK_GetCurrent();
 796
 797     if (pCurTask && pCurTask->hQueue)
 798     {
 799         HMODULE mod = GetModuleHandleA( "user32.dll" );
 800         if (mod)
 801         {
 802             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 803             if (proc)
 804             {
 805                 proc();
 806                 return;
 807             }
 808         }
 809     }
 810     OldYield16();
 811 }
 812
 813 /***********************************************************************
 814  *           KERNEL_490  (KERNEL.490)
 815  */
 816 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 817 {
 818     if ( !someTask ) return 0;
 819
 820     FIXME("(%04x): stub\n", someTask );
 821     return 0;
 822 }
 823
 824 /***********************************************************************
 825  *           MakeProcInstance  (KERNEL.51)
 826  */
 827 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 828 {
 829     BYTE *thunk,*lfunc;
 830     SEGPTR thunkaddr;
 831     WORD hInstanceSelector;
 832
 833     hInstanceSelector = GlobalHandleToSel16(hInstance);
 834
 835     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 836
 837     if (!HIWORD(func)) {
 838       /* Win95 actually protects via SEH, but this is better for debugging */
 839       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 840       return (FARPROC16)0;
 841     }
 842
 843     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 844       && (hInstance != 0)
 845       && (hInstance != 0xffff) )
 846     {
 847         /* calling MPI with a foreign DSEG is invalid ! */
 848         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 849                    hInstance,CURRENT_DS);
 850     }
 851
 852     /* Always use the DSEG that MPI was entered with.
 853      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 854      * as CURRENT_DS provides the DSEG value we need.
 855      * ("calling" DS, *not* "task" DS !) */
 856     hInstanceSelector = CURRENT_DS;
 857     hInstance = GlobalHandle16(hInstanceSelector);
 858
 859     /* no thunking for DLLs */
 860     if (NE_GetPtr(FarGetOwner16(hInstance))->flags & NE_FFLAGS_LIBMODULE)
 861         return func;
 862
 863     thunkaddr = TASK_AllocThunk();
 864     if (!thunkaddr) return (FARPROC16)0;
 865     thunk = MapSL( thunkaddr );
 866     lfunc = MapSL( (SEGPTR)func );
 867
 868     TRACE("(%08lx,%04x): got thunk %08lx\n",
 869           (DWORD)func, hInstance, (DWORD)thunkaddr );
 870     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 871         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 872     ) {
 873         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 874     }
 875
 876     *thunk++ = 0xb8;    /* movw instance, %ax */
 877     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 878     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 879     *thunk++ = 0xea;    /* ljmp func */
 880     *(DWORD *)thunk = (DWORD)func;
 881     return (FARPROC16)thunkaddr;
 882     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 883 }
 884
 885
 886 /***********************************************************************
 887  *           FreeProcInstance  (KERNEL.52)
 888  */
 889 void WINAPI FreeProcInstance16( FARPROC16 func )
 890 {
 891     TRACE("(%08lx)\n", (DWORD)func );
 892     TASK_FreeThunk( (SEGPTR)func );
 893 }
 894
 895 /**********************************************************************
 896  *          TASK_GetCodeSegment
 897  *
 898  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 899  * and logical segment number of a given code segment.
 900  *
 901  * 'proc' either *is* already a pair of module handle and segment number,
 902  * in which case there's nothing to do.  Otherwise, it is a pointer to
 903  * a function, and we need to retrieve the code segment.  If the pointer
 904  * happens to point to a thunk, we'll retrieve info about the code segment
 905  * where the function pointed to by the thunk resides, not the thunk itself.
 906  *
 907  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 908  *        the function the snoop code will return to ...
 909  *
 910  */
 911 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 912                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 913 {
 914     NE_MODULE *pModule = NULL;
 915     SEGTABLEENTRY *pSeg = NULL;
 916     int segNr=0;
 917
 918     /* Try pair of module handle / segment number */
 919     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 920     if ( pModule && pModule->magic == IMAGE_OS2_SIGNATURE )
 921     {
 922         segNr = LOWORD( proc );
 923         if ( segNr && segNr <= pModule->seg_count )
 924             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 925     }
 926
 927     /* Try thunk or function */
 928     else
 929     {
 930         BYTE *thunk = MapSL( (SEGPTR)proc );
 931         WORD selector;
 932
 933         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 934             selector = thunk[6] + (thunk[7] << 8);
 935         else
 936             selector = HIWORD( proc );
 937
 938         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 939         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 940
 941         if ( pModule )
 942             for ( segNr = 1; segNr <= pModule->seg_count; segNr++, pSeg++ )
 943                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 944                     break;
 945
 946         if ( pModule && segNr > pModule->seg_count )
 947             pSeg = NULL;
 948     }
 949
 950     /* Abort if segment not found */
 951
 952     if ( !pModule || !pSeg )
 953         return FALSE;
 954
 955     /* Return segment data */
 956
 957     if ( ppModule ) *ppModule = pModule;
 958     if ( ppSeg    ) *ppSeg    = pSeg;
 959     if ( pSegNr   ) *pSegNr   = segNr;
 960
 961     return TRUE;
 962 }
 963
 964 /**********************************************************************
 965  *          GetCodeHandle    (KERNEL.93)
 966  */
 967 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 968 {
 969     SEGTABLEENTRY *pSeg;
 970
 971     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 972         return (HANDLE16)0;
 973
 974     return pSeg->hSeg;
 975 }
 976
 977 /**********************************************************************
 978  *          GetCodeInfo    (KERNEL.104)
 979  */
 980 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 981 {
 982     NE_MODULE *pModule;
 983     SEGTABLEENTRY *pSeg;
 984     int segNr;
 985
 986     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 987         return FALSE;
 988
 989     /* Fill in segment information */
 990
 991     segInfo->offSegment = pSeg->filepos;
 992     segInfo->cbSegment  = pSeg->size;
 993     segInfo->flags      = pSeg->flags;
 994     segInfo->cbAlloc    = pSeg->minsize;
 995     segInfo->h          = pSeg->hSeg;
 996     segInfo->alignShift = pModule->alignment;
 997
 998     if ( segNr == pModule->dgroup )
 999         segInfo->cbAlloc += pModule->heap_size + pModule->stack_size;
1000
1001     /* Return module handle in %es */
1002
1003     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1004
1005     return TRUE;
1006 }
1007
1008
1009 /**********************************************************************
1010  *          DefineHandleTable    (KERNEL.94)
1011  */
1012 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1013 {
1014     FIXME("(%04x): stub ?\n", wOffset);
1015     return TRUE;
1016 }
1017
1018
1019 /***********************************************************************
1020  *           SetTaskQueue  (KERNEL.34)
1021  */
1022 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1023 {
1024     FIXME( "stub, should not get called\n" );
1025     return 0xbeef;
1026 }
1027
1028
1029 /***********************************************************************
1030  *           GetTaskQueue  (KERNEL.35)
1031  */
1032 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1033 {
1034     FIXME( "stub, should not get called\n" );
1035     return 0xbeef;
1036 }
1037
1038 /***********************************************************************
1039  *           SetThreadQueue  (KERNEL.463)
1040  */
1041 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1042 {
1043     FIXME( "stub, should not get called\n" );
1044     return 0xbeef;
1045 }
1046
1047 /***********************************************************************
1048  *           GetThreadQueue  (KERNEL.464)
1049  */
1050 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1051 {
1052     FIXME( "stub, should not get called\n" );
1053     return 0xbeef;
1054 }
1055
1056 /***********************************************************************
1057  *           SetFastQueue  (KERNEL.624)
1058  */
1059 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1060 {
1061     FIXME( "stub, should not get called\n" );
1062 }
1063
1064 /***********************************************************************
1065  *           GetFastQueue  (KERNEL.625)
1066  */
1067 HQUEUE16 WINAPI GetFastQueue16( void )
1068 {
1069     FIXME( "stub, should not get called\n" );
1070     return 0xbeef;
1071 }
1072
1073 /***********************************************************************
1074  *           SwitchStackTo   (KERNEL.108)
1075  */
1076 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1077 {
1078     STACK16FRAME *oldFrame, *newFrame;
1079     INSTANCEDATA *pData;
1080     UINT16 copySize;
1081
1082     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1083     TRACE("old=%04x:%04x new=%04x:%04x\n",
1084           SELECTOROF( NtCurrentTeb()->WOW32Reserved ),
1085           OFFSETOF( NtCurrentTeb()->WOW32Reserved ), seg, ptr );
1086
1087     /* Save the old stack */
1088
1089     oldFrame = CURRENT_STACK16;
1090     /* pop frame + args and push bp */
1091     pData->old_ss_sp   = (SEGPTR)NtCurrentTeb()->WOW32Reserved + sizeof(STACK16FRAME)
1092                            + 2 * sizeof(WORD);
1093     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1094     pData->stacktop    = top;
1095     pData->stackmin    = ptr;
1096     pData->stackbottom = ptr;
1097
1098     /* Switch to the new stack */
1099
1100     /* Note: we need to take the 3 arguments into account; otherwise,
1101      * the stack will underflow upon return from this function.
1102      */
1103     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1104     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1105     NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR( seg, ptr - copySize );
1106     newFrame = CURRENT_STACK16;
1107
1108     /* Copy the stack frame and the local variables to the new stack */
1109
1110     memmove( newFrame, oldFrame, copySize );
1111     newFrame->bp = ptr;
1112     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1113 }
1114
1115
1116 /***********************************************************************
1117  *           SwitchStackBack   (KERNEL.109)
1118  */
1119 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1120 {
1121     STACK16FRAME *oldFrame, *newFrame;
1122     INSTANCEDATA *pData;
1123
1124     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->WOW32Reserved))))
1125         return;
1126     if (!pData->old_ss_sp)
1127     {
1128         WARN("No previous SwitchStackTo\n" );
1129         return;
1130     }
1131     TRACE("restoring stack %04x:%04x\n",
1132           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1133
1134     oldFrame = CURRENT_STACK16;
1135
1136     /* Pop bp from the previous stack */
1137
1138     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1139     pData->old_ss_sp += sizeof(WORD);
1140
1141     /* Switch back to the old stack */
1142
1143     NtCurrentTeb()->WOW32Reserved = (void *)(pData->old_ss_sp - sizeof(STACK16FRAME));
1144     context->SegSs = SELECTOROF(pData->old_ss_sp);
1145     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1146     pData->old_ss_sp = 0;
1147
1148     /* Build a stack frame for the return */
1149
1150     newFrame = CURRENT_STACK16;
1151     newFrame->frame32     = oldFrame->frame32;
1152     newFrame->module_cs   = oldFrame->module_cs;
1153     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1154     newFrame->entry_ip    = oldFrame->entry_ip;
1155 }
1156
1157
1158 /***********************************************************************
1159  *           GetTaskQueueDS  (KERNEL.118)
1160  */
1161 void WINAPI GetTaskQueueDS16(void)
1162 {
1163     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1164 }
1165
1166
1167 /***********************************************************************
1168  *           GetTaskQueueES  (KERNEL.119)
1169  */
1170 void WINAPI GetTaskQueueES16(void)
1171 {
1172     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1173 }
1174
1175
1176 /***********************************************************************
1177  *           GetCurrentTask   (KERNEL32.@)
1178  */
1179 HTASK16 WINAPI GetCurrentTask(void)
1180 {
1181     return NtCurrentTeb()->htask16;
1182 }
1183
1184 /***********************************************************************
1185  *           GetCurrentTask   (KERNEL.36)
1186  */
1187 DWORD WINAPI WIN16_GetCurrentTask(void)
1188 {
1189     /* This is the version used by relay code; the first task is */
1190     /* returned in the high word of the result */
1191     return MAKELONG( GetCurrentTask(), hFirstTask );
1192 }
1193
1194
1195 /***********************************************************************
1196  *           GetCurrentPDB   (KERNEL.37)
1197  *
1198  * UNDOC: returns PSP of KERNEL in high word
1199  */
1200 DWORD WINAPI GetCurrentPDB16(void)
1201 {
1202     TDB *pTask;
1203
1204     if (!(pTask = TASK_GetCurrent())) return 0;
1205     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1206 }
1207
1208
1209 /***********************************************************************
1210  *           GetCurPID   (KERNEL.157)
1211  */
1212 DWORD WINAPI GetCurPID16( DWORD unused )
1213 {
1214     return 0;
1215 }
1216
1217
1218 /***********************************************************************
1219  *           GetInstanceData   (KERNEL.54)
1220  */
1221 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1222 {
1223     char *ptr = (char *)GlobalLock16( instance );
1224     if (!ptr || !len) return 0;
1225     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1226     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1227     return len;
1228 }
1229
1230
1231 /***********************************************************************
1232  *           GetExeVersion   (KERNEL.105)
1233  */
1234 WORD WINAPI GetExeVersion16(void)
1235 {
1236     TDB *pTask;
1237
1238     if (!(pTask = TASK_GetCurrent())) return 0;
1239     return pTask->version;
1240 }
1241
1242
1243 /***********************************************************************
1244  *           SetErrorMode   (KERNEL.107)
1245  */
1246 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1247 {
1248     TDB *pTask;
1249     if (!(pTask = TASK_GetCurrent())) return 0;
1250     pTask->error_mode = mode;
1251     return SetErrorMode( mode );
1252 }
1253
1254
1255 /***********************************************************************
1256  *           GetNumTasks   (KERNEL.152)
1257  */
1258 UINT16 WINAPI GetNumTasks16(void)
1259 {
1260     return nTaskCount;
1261 }
1262
1263
1264 /***********************************************************************
1265  *           GetTaskDS   (KERNEL.155)
1266  *
1267  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1268  * I don't think we need to bother with this.
1269  */
1270 HINSTANCE16 WINAPI GetTaskDS16(void)
1271 {
1272     TDB *pTask;
1273
1274     if (!(pTask = TASK_GetCurrent())) return 0;
1275     return GlobalHandleToSel16(pTask->hInstance);
1276 }
1277
1278 /***********************************************************************
1279  *           GetDummyModuleHandleDS   (KERNEL.602)
1280  */
1281 WORD WINAPI GetDummyModuleHandleDS16(void)
1282 {
1283     TDB *pTask;
1284     WORD selector;
1285
1286     if (!(pTask = TASK_GetCurrent())) return 0;
1287     if (!(pTask->flags & TDBF_WIN32)) return 0;
1288     selector = GlobalHandleToSel16( pTask->hModule );
1289     CURRENT_DS = selector;
1290     return selector;
1291 }
1292
1293 /***********************************************************************
1294  *           IsTask   (KERNEL.320)
1295  */
1296 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1297 {
1298     TDB *pTask;
1299
1300     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1301     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1302     return (pTask->magic == TDB_MAGIC);
1303 }
1304
1305
1306 /***********************************************************************
1307  *           IsWinOldApTask   (KERNEL.158)
1308  */
1309 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1310 {
1311     /* should return bit 0 of byte 0x48 in PSP */
1312     return FALSE;
1313 }
1314
1315 /***********************************************************************
1316  *           SetTaskSignalProc   (KERNEL.38)
1317  */
1318 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1319 {
1320     TDB *pTask;
1321     FARPROC16 oldProc;
1322
1323     if (!hTask) hTask = GetCurrentTask();
1324     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1325     oldProc = pTask->userhandler;
1326     pTask->userhandler = proc;
1327     return oldProc;
1328 }
1329
1330 /***********************************************************************
1331  *           SetSigHandler   (KERNEL.140)
1332  */
1333 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1334                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1335 {
1336     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1337           newhandler,oldhandler,oldmode,newmode,flag );
1338
1339     if (flag != 1) return 0;
1340     if (!newmode) newhandler = NULL;  /* Default handler */
1341     if (newmode != 4)
1342     {
1343         TDB *pTask;
1344
1345         if (!(pTask = TASK_GetCurrent())) return 0;
1346         if (oldmode) *oldmode = pTask->signal_flags;
1347         pTask->signal_flags = newmode;
1348         if (oldhandler) *oldhandler = pTask->sighandler;
1349         pTask->sighandler = newhandler;
1350     }
1351     return 0;
1352 }
1353
1354
1355 /***********************************************************************
1356  *           GlobalNotify   (KERNEL.154)
1357  *
1358  * Note that GlobalNotify does _not_ return the old NotifyProc
1359  * -- contrary to LocalNotify !!
1360  */
1361 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1362 {
1363     TDB *pTask;
1364
1365     if (!(pTask = TASK_GetCurrent())) return;
1366     pTask->discardhandler = proc;
1367 }
1368
1369
1370 /***********************************************************************
1371  *           GetExePtrHelper
1372  */
1373 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1374 {
1375     char *ptr;
1376     HANDLE16 owner;
1377
1378       /* Check for module handle */
1379
1380     if (!(ptr = GlobalLock16( handle ))) return 0;
1381     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1382
1383       /* Search for this handle inside all tasks */
1384
1385     *hTask = hFirstTask;
1386     while (*hTask)
1387     {
1388         TDB *pTask = TASK_GetPtr( *hTask );
1389         if ((*hTask == handle) ||
1390             (pTask->hInstance == handle) ||
1391             (pTask->hQueue == handle) ||
1392             (pTask->hPDB == handle)) return pTask->hModule;
1393         *hTask = pTask->hNext;
1394     }
1395
1396       /* Check the owner for module handle */
1397
1398     owner = FarGetOwner16( handle );
1399     if (!(ptr = GlobalLock16( owner ))) return 0;
1400     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1401
1402       /* Search for the owner inside all tasks */
1403
1404     *hTask = hFirstTask;
1405     while (*hTask)
1406     {
1407         TDB *pTask = TASK_GetPtr( *hTask );
1408         if ((*hTask == owner) ||
1409             (pTask->hInstance == owner) ||
1410             (pTask->hQueue == owner) ||
1411             (pTask->hPDB == owner)) return pTask->hModule;
1412         *hTask = pTask->hNext;
1413     }
1414
1415     return 0;
1416 }
1417
1418 /***********************************************************************
1419  *           GetExePtr   (KERNEL.133)
1420  */
1421 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1422 {
1423     HTASK16 hTask = 0;
1424     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1425     STACK16FRAME *frame = CURRENT_STACK16;
1426     frame->ecx = hModule;
1427     if (hTask) frame->es = hTask;
1428     return hModule;
1429 }
1430
1431
1432 /***********************************************************************
1433  *           K228   (KERNEL.228)
1434  */
1435 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1436 {
1437     HTASK16 hTask = 0;
1438     return GetExePtrHelper( handle, &hTask );
1439 }
1440
1441
1442 /***********************************************************************
1443  *           TaskFirst   (TOOLHELP.63)
1444  */
1445 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1446 {
1447     lpte->hNext = hFirstTask;
1448     return TaskNext16( lpte );
1449 }
1450
1451
1452 /***********************************************************************
1453  *           TaskNext   (TOOLHELP.64)
1454  */
1455 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1456 {
1457     TDB *pTask;
1458     INSTANCEDATA *pInstData;
1459
1460     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1461     if (!lpte->hNext) return FALSE;
1462
1463     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1464     while (1) {
1465         pTask = TASK_GetPtr( lpte->hNext );
1466         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1467         if (pTask->hInstance)
1468             break;
1469         lpte->hNext = pTask->hNext;
1470     }
1471     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1472     lpte->hTask         = lpte->hNext;
1473     lpte->hTaskParent   = pTask->hParent;
1474     lpte->hInst         = pTask->hInstance;
1475     lpte->hModule       = pTask->hModule;
1476     lpte->wSS           = SELECTOROF( pTask->teb->WOW32Reserved );
1477     lpte->wSP           = OFFSETOF( pTask->teb->WOW32Reserved );
1478     lpte->wStackTop     = pInstData->stacktop;
1479     lpte->wStackMinimum = pInstData->stackmin;
1480     lpte->wStackBottom  = pInstData->stackbottom;
1481     lpte->wcEvents      = pTask->nEvents;
1482     lpte->hQueue        = pTask->hQueue;
1483     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1484     lpte->wPSPOffset    = 0x100;  /*??*/
1485     lpte->hNext         = pTask->hNext;
1486     return TRUE;
1487 }
1488
1489
1490 /***********************************************************************
1491  *           TaskFindHandle   (TOOLHELP.65)
1492  */
1493 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1494 {
1495     lpte->hNext = hTask;
1496     return TaskNext16( lpte );
1497 }
1498
1499
1500 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1501
1502 /**************************************************************************
1503  *           FatalAppExit   (KERNEL.137)
1504  */
1505 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1506 {
1507     TDB *pTask = TASK_GetCurrent();
1508
1509     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1510     {
1511         HMODULE mod = GetModuleHandleA( "user32.dll" );
1512         if (mod)
1513         {
1514             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1515             if (pMessageBoxA)
1516             {
1517                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1518                 goto done;
1519             }
1520         }
1521         ERR( "%s\n", debugstr_a(str) );
1522     }
1523  done:
1524     ExitThread(0xff);
1525 }
1526
1527
1528 /***********************************************************************
1529  *           TerminateApp   (TOOLHELP.77)
1530  *
1531  * See "Undocumented Windows".
1532  */
1533 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1534 {
1535     if (hTask && hTask != GetCurrentTask())
1536     {
1537         FIXME("cannot terminate task %x\n", hTask);
1538         return;
1539     }
1540
1541     if (wFlags & NO_UAE_BOX)
1542     {
1543         UINT16 old_mode;
1544         old_mode = SetErrorMode16(0);
1545         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1546     }
1547     FatalAppExit16( 0, NULL );
1548
1549     /* hmm, we're still alive ?? */
1550
1551     /* check undocumented flag */
1552     if (!(wFlags & 0x8000))
1553         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1554
1555     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1556        but let's just call ExitThread */
1557     ExitThread(0xff);
1558 }
1559
1560
1561 /***********************************************************************
1562  *           GetAppCompatFlags   (KERNEL.354)
1563  */
1564 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1565 {
1566     TDB *pTask;
1567
1568     if (!hTask) hTask = GetCurrentTask();
1569     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1570     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1571     return pTask->compat_flags;
1572 }
1573
1574
1575 /***********************************************************************
1576  *           GetDOSEnvironment     (KERNEL.131)
1577  *
1578  * Note: the environment is allocated once, it doesn't track changes
1579  * made using the Win32 API. This shouldn't matter.
1580  *
1581  * Format of a 16-bit environment block:
1582  * ASCIIZ   string 1 (xx=yy format)
1583  * ...
1584  * ASCIIZ   string n
1585  * BYTE     0
1586  * WORD     1
1587  * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1588  */
1589 SEGPTR WINAPI GetDOSEnvironment16(void)
1590 {
1591     static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1592     static HGLOBAL16 handle;  /* handle to the 16 bit environment */
1593
1594     if (!handle)
1595     {
1596         DWORD size;
1597         LPSTR p, env;
1598
1599         p = env = GetEnvironmentStringsA();
1600         while (*p) p += strlen(p) + 1;
1601         p++;  /* skip last null */
1602         size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1603         handle = GlobalAlloc16( GMEM_FIXED, size );
1604         if (handle)
1605         {
1606             WORD one = 1;
1607             LPSTR env16 = GlobalLock16( handle );
1608             memcpy( env16, env, p - env );
1609             memcpy( env16 + (p - env), &one, sizeof(one));
1610             memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1611             GlobalUnlock16( handle );
1612         }
1613         FreeEnvironmentStringsA( env );
1614     }
1615     return K32WOWGlobalLock16( handle );
1616 }