dlls/kernel/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <stdarg.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <assert.h>
  28 #ifdef HAVE_UNISTD_H
  29 # include <unistd.h>
  30 #endif
  31
  32 #include "windef.h"
  33 #include "winbase.h"
  34 #include "wingdi.h"
  35 #include "winnt.h"
  36 #include "wownt32.h"
  37 #include "winuser.h"
  38
  39 #include "wine/winbase16.h"
  40 #include "thread.h"
  41 #include "winternl.h"
  42 #include "wine/server.h"
  43 #include "toolhelp.h"
  44 #include "kernel_private.h"
  45 #include "kernel16_private.h"
  46
  47 #include "wine/debug.h"
  48
  49 WINE_DEFAULT_DEBUG_CHANNEL(task);
  50 WINE_DECLARE_DEBUG_CHANNEL(relay);
  51 WINE_DECLARE_DEBUG_CHANNEL(toolhelp);
  52
  53 #include "pshpack1.h"
  54
  55 /* Segment containing MakeProcInstance() thunks */
  56 typedef struct
  57 {
  58     WORD  next;       /* Selector of next segment */
  59     WORD  magic;      /* Thunks signature */
  60     WORD  unused;
  61     WORD  free;       /* Head of the free list */
  62     WORD  thunks[4];  /* Each thunk is 4 words long */
  63 } THUNKS;
  64
  65 #include "poppack.h"
  66
  67 #define THUNK_MAGIC  ('P' | ('T' << 8))
  68
  69   /* Min. number of thunks allocated when creating a new segment */
  70 #define MIN_THUNKS  32
  71
  72 #define TDB_MAGIC    ('T' | ('D' << 8))
  73
  74 static THHOOK DefaultThhook;
  75 THHOOK *pThhook = &DefaultThhook;
  76
  77 #define hFirstTask   (pThhook->HeadTDB)
  78 #define hLockedTask  (pThhook->LockTDB)
  79
  80 static UINT16 nTaskCount = 0;
  81
  82 static HTASK16 initial_task;
  83
  84 /***********************************************************************
  85  *           TASK_InstallTHHook
  86  */
  87 void TASK_InstallTHHook( THHOOK *pNewThhook )
  88 {
  89      THHOOK *pOldThhook = pThhook;
  90
  91      pThhook = pNewThhook? pNewThhook : &DefaultThhook;
  92
  93      *pThhook = *pOldThhook;
  94 }
  95
  96 /***********************************************************************
  97  *           TASK_GetPtr
  98  */
  99 static TDB *TASK_GetPtr( HTASK16 hTask )
 100 {
 101     return GlobalLock16( hTask );
 102 }
 103
 104
 105 /***********************************************************************
 106  *           TASK_GetCurrent
 107  */
 108 TDB *TASK_GetCurrent(void)
 109 {
 110     return TASK_GetPtr( GetCurrentTask() );
 111 }
 112
 113
 114 /***********************************************************************
 115  *           TASK_LinkTask
 116  */
 117 static void TASK_LinkTask( HTASK16 hTask )
 118 {
 119     HTASK16 *prevTask;
 120     TDB *pTask;
 121
 122     if (!(pTask = TASK_GetPtr( hTask ))) return;
 123     prevTask = &hFirstTask;
 124     while (*prevTask)
 125     {
 126         TDB *prevTaskPtr = TASK_GetPtr( *prevTask );
 127         if (prevTaskPtr->priority >= pTask->priority) break;
 128         prevTask = &prevTaskPtr->hNext;
 129     }
 130     pTask->hNext = *prevTask;
 131     *prevTask = hTask;
 132     nTaskCount++;
 133 }
 134
 135
 136 /***********************************************************************
 137  *           TASK_UnlinkTask
 138  */
 139 static void TASK_UnlinkTask( HTASK16 hTask )
 140 {
 141     HTASK16 *prevTask;
 142     TDB *pTask;
 143
 144     prevTask = &hFirstTask;
 145     while (*prevTask && (*prevTask != hTask))
 146     {
 147         pTask = TASK_GetPtr( *prevTask );
 148         prevTask = &pTask->hNext;
 149     }
 150     if (*prevTask)
 151     {
 152         pTask = TASK_GetPtr( *prevTask );
 153         *prevTask = pTask->hNext;
 154         pTask->hNext = 0;
 155         nTaskCount--;
 156     }
 157 }
 158
 159
 160 /***********************************************************************
 161  *           TASK_CreateThunks
 162  *
 163  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 164  * and containing 'count' entries.
 165  */
 166 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 167 {
 168     int i;
 169     WORD free;
 170     THUNKS *pThunk;
 171
 172     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 173     pThunk->next = 0;
 174     pThunk->magic = THUNK_MAGIC;
 175     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 176     free = pThunk->free;
 177     for (i = 0; i < count-1; i++)
 178     {
 179         free += 8;  /* Offset of next thunk */
 180         pThunk->thunks[4*i] = free;
 181     }
 182     pThunk->thunks[4*i] = 0;  /* Last thunk */
 183 }
 184
 185
 186 /***********************************************************************
 187  *           TASK_AllocThunk
 188  *
 189  * Allocate a thunk for MakeProcInstance().
 190  */
 191 static SEGPTR TASK_AllocThunk(void)
 192 {
 193     TDB *pTask;
 194     THUNKS *pThunk;
 195     WORD sel, base;
 196
 197     if (!(pTask = TASK_GetCurrent())) return 0;
 198     sel = pTask->hCSAlias;
 199     pThunk = (THUNKS *)&pTask->thunks;
 200     base = (char *)pThunk - (char *)pTask;
 201     while (!pThunk->free)
 202     {
 203         sel = pThunk->next;
 204         if (!sel)  /* Allocate a new segment */
 205         {
 206             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 207                                 pTask->hPDB, WINE_LDT_FLAGS_CODE );
 208             if (!sel) return (SEGPTR)0;
 209             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 210             pThunk->next = sel;
 211         }
 212         pThunk = (THUNKS *)GlobalLock16( sel );
 213         base = 0;
 214     }
 215     base += pThunk->free;
 216     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 217     return MAKESEGPTR( sel, base );
 218 }
 219
 220
 221 /***********************************************************************
 222  *           TASK_FreeThunk
 223  *
 224  * Free a MakeProcInstance() thunk.
 225  */
 226 static BOOL TASK_FreeThunk( SEGPTR thunk )
 227 {
 228     TDB *pTask;
 229     THUNKS *pThunk;
 230     WORD sel, base;
 231
 232     if (!(pTask = TASK_GetCurrent())) return 0;
 233     sel = pTask->hCSAlias;
 234     pThunk = (THUNKS *)&pTask->thunks;
 235     base = (char *)pThunk - (char *)pTask;
 236     while (sel && (sel != HIWORD(thunk)))
 237     {
 238         sel = pThunk->next;
 239         pThunk = (THUNKS *)GlobalLock16( sel );
 240         base = 0;
 241     }
 242     if (!sel) return FALSE;
 243     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 244     pThunk->free = LOWORD(thunk) - base;
 245     return TRUE;
 246 }
 247
 248
 249 /***********************************************************************
 250  *           TASK_Create
 251  *
 252  * NOTE: This routine might be called by a Win32 thread. Thus, we need
 253  *       to be careful to protect global data structures. We do this
 254  *       by entering the Win16Lock while linking the task into the
 255  *       global task list.
 256  */
 257 static TDB *TASK_Create( NE_MODULE *pModule, UINT16 cmdShow, LPCSTR cmdline, BYTE len )
 258 {
 259     HTASK16 hTask;
 260     TDB *pTask;
 261     FARPROC16 proc;
 262     char curdir[MAX_PATH];
 263     HMODULE16 hModule = pModule ? pModule->self : 0;
 264
 265       /* Allocate the task structure */
 266
 267     hTask = GlobalAlloc16( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB) );
 268     if (!hTask) return NULL;
 269     pTask = TASK_GetPtr( hTask );
 270     FarSetOwner16( hTask, hModule );
 271
 272     /* Fill the task structure */
 273
 274     pTask->hSelf = hTask;
 275
 276     pTask->version       = pModule ? pModule->ne_expver : 0x0400;
 277     pTask->hModule       = hModule;
 278     pTask->hParent       = GetCurrentTask();
 279     pTask->magic         = TDB_MAGIC;
 280     pTask->nCmdShow      = cmdShow;
 281
 282     GetCurrentDirectoryA( sizeof(curdir), curdir );
 283     GetShortPathNameA( curdir, curdir, sizeof(curdir) );
 284     pTask->curdrive = (curdir[0] - 'A') | 0x80;
 285     lstrcpynA( pTask->curdir, curdir + 2, sizeof(pTask->curdir) );
 286
 287       /* Create the thunks block */
 288
 289     TASK_CreateThunks( hTask, (char *)&pTask->thunks - (char *)pTask, 7 );
 290
 291       /* Copy the module name */
 292
 293     if (hModule)
 294     {
 295         char name[sizeof(pTask->module_name)+1];
 296         size_t len;
 297         GetModuleName16( hModule, name, sizeof(name) );
 298         len = strlen(name) + 1;
 299         memcpy(pTask->module_name, name, min(len,sizeof(pTask->module_name)));
 300         pTask->compat_flags = GetProfileIntA( "Compatibility", name, 0 );
 301     }
 302
 303       /* Allocate a selector for the PDB */
 304
 305     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB16),
 306                                       hModule, WINE_LDT_FLAGS_DATA );
 307
 308       /* Fill the PDB */
 309
 310     pTask->pdb.int20 = 0x20cd;
 311     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 312     proc = GetProcAddress16( GetModuleHandle16("KERNEL"), "DOS3Call" );
 313     memcpy( &pTask->pdb.dispatcher[1], &proc, sizeof(proc) );
 314     pTask->pdb.savedint22 = 0;
 315     pTask->pdb.savedint23 = 0;
 316     pTask->pdb.savedint24 = 0;
 317     pTask->pdb.fileHandlesPtr =
 318         MAKESEGPTR( GlobalHandleToSel16(pTask->hPDB), (int)&((PDB16 *)0)->fileHandles );
 319     pTask->pdb.hFileHandles = 0;
 320     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 321     /* FIXME: should we make a copy of the environment? */
 322     pTask->pdb.environment    = SELECTOROF(GetDOSEnvironment16());
 323     pTask->pdb.nbFiles        = 20;
 324
 325     /* Fill the command line */
 326
 327     if (!cmdline)
 328     {
 329         cmdline = GetCommandLineA();
 330         /* remove the first word (program name) */
 331         if (*cmdline == '"')
 332             if (!(cmdline = strchr( cmdline+1, '"' ))) cmdline = GetCommandLineA();
 333         while (*cmdline && (*cmdline != ' ') && (*cmdline != '\t')) cmdline++;
 334         while ((*cmdline == ' ') || (*cmdline == '\t')) cmdline++;
 335         len = strlen(cmdline);
 336     }
 337     if (len >= sizeof(pTask->pdb.cmdLine)) len = sizeof(pTask->pdb.cmdLine)-1;
 338     pTask->pdb.cmdLine[0] = len;
 339     memcpy( pTask->pdb.cmdLine + 1, cmdline, len );
 340     /* pTask->pdb.cmdLine[len+1] = 0; */
 341
 342     TRACE("cmdline='%.*s' task=%04x\n", len, cmdline, hTask );
 343
 344       /* Allocate a code segment alias for the TDB */
 345
 346     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 347                                           sizeof(TDB), pTask->hPDB, WINE_LDT_FLAGS_CODE );
 348
 349       /* Default DTA overwrites command line */
 350
 351     pTask->dta = MAKESEGPTR( pTask->hPDB, (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 352
 353     /* Create scheduler event for 16-bit tasks */
 354
 355     if ( !(pTask->flags & TDBF_WIN32) )
 356         NtCreateEvent( &pTask->hEvent, EVENT_ALL_ACCESS, NULL, TRUE, FALSE );
 357
 358     if (!initial_task) initial_task = hTask;
 359
 360     return pTask;
 361 }
 362
 363
 364 /***********************************************************************
 365  *           TASK_DeleteTask
 366  */
 367 static void TASK_DeleteTask( HTASK16 hTask )
 368 {
 369     TDB *pTask;
 370     HGLOBAL16 hPDB;
 371
 372     if (!(pTask = TASK_GetPtr( hTask ))) return;
 373     hPDB = pTask->hPDB;
 374
 375     pTask->magic = 0xdead; /* invalidate signature */
 376
 377     /* Free the selector aliases */
 378
 379     GLOBAL_FreeBlock( pTask->hCSAlias );
 380     GLOBAL_FreeBlock( pTask->hPDB );
 381
 382     /* Free the task module */
 383
 384     FreeModule16( pTask->hModule );
 385
 386     /* Free the task structure itself */
 387
 388     GlobalFree16( hTask );
 389
 390     /* Free all memory used by this task (including the 32-bit stack, */
 391     /* the environment block and the thunk segments). */
 392
 393     GlobalFreeAll16( hPDB );
 394 }
 395
 396
 397 /***********************************************************************
 398  *           TASK_CreateMainTask
 399  *
 400  * Create a task for the main (32-bit) process.
 401  */
 402 void TASK_CreateMainTask(void)
 403 {
 404     TDB *pTask;
 405     STARTUPINFOA startup_info;
 406     UINT cmdShow = 1; /* SW_SHOWNORMAL but we don't want to include winuser.h here */
 407
 408     GetStartupInfoA( &startup_info );
 409     if (startup_info.dwFlags & STARTF_USESHOWWINDOW) cmdShow = startup_info.wShowWindow;
 410     pTask = TASK_Create( NULL, cmdShow, NULL, 0 );
 411     if (!pTask)
 412     {
 413         ERR("could not create task for main process\n");
 414         ExitProcess(1);
 415     }
 416
 417     pTask->flags        |= TDBF_WIN32;
 418     pTask->hInstance     = 0;
 419     pTask->hPrevInstance = 0;
 420     pTask->teb           = NtCurrentTeb();
 421
 422     NtCurrentTeb()->htask16 = pTask->hSelf;
 423
 424     /* Add the task to the linked list */
 425     /* (no need to get the win16 lock, we are the only thread at this point) */
 426     TASK_LinkTask( pTask->hSelf );
 427 }
 428
 429
 430 /* allocate the win16 TIB for a new 16-bit task */
 431 static WIN16_SUBSYSTEM_TIB *allocate_win16_tib( TDB *pTask )
 432 {
 433     WCHAR path[MAX_PATH];
 434     WIN16_SUBSYSTEM_TIB *tib;
 435     UNICODE_STRING *curdir;
 436     NE_MODULE *pModule = NE_GetPtr( pTask->hModule );
 437
 438     if (!(tib = HeapAlloc( GetProcessHeap(), 0, sizeof(*tib) ))) return NULL;
 439     MultiByteToWideChar( CP_ACP, 0, NE_MODULE_NAME(pModule), -1, path, MAX_PATH );
 440     GetLongPathNameW( path, path, MAX_PATH );
 441     if (RtlCreateUnicodeString( &tib->exe_str, path )) tib->exe_name = &tib->exe_str;
 442     else tib->exe_name = NULL;
 443
 444     RtlAcquirePebLock();
 445     curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 446     tib->curdir.DosPath.MaximumLength = sizeof(tib->curdir_buffer);
 447     tib->curdir.DosPath.Length = min( curdir->Length, tib->curdir.DosPath.MaximumLength-sizeof(WCHAR) );
 448     tib->curdir.DosPath.Buffer = tib->curdir_buffer;
 449     tib->curdir.Handle = 0;
 450     memcpy( tib->curdir_buffer, curdir->Buffer, tib->curdir.DosPath.Length );
 451     tib->curdir_buffer[tib->curdir.DosPath.Length/sizeof(WCHAR)] = 0;
 452     RtlReleasePebLock();
 453     return tib;
 454 }
 455
 456 /* startup routine for a new 16-bit thread */
 457 static DWORD CALLBACK task_start( LPVOID p )
 458 {
 459     TDB *pTask = (TDB *)p;
 460     DWORD ret;
 461
 462     NtCurrentTeb()->htask16 = pTask->hSelf;
 463     NtCurrentTeb()->Tib.SubSystemTib = allocate_win16_tib( pTask );
 464
 465     _EnterWin16Lock();
 466     TASK_LinkTask( pTask->hSelf );
 467     pTask->teb = NtCurrentTeb();
 468     ret = NE_StartTask();
 469     _LeaveWin16Lock();
 470     return ret;
 471 }
 472
 473
 474 /***********************************************************************
 475  *           TASK_SpawnTask
 476  *
 477  * Spawn a new 16-bit task.
 478  */
 479 HTASK16 TASK_SpawnTask( NE_MODULE *pModule, WORD cmdShow,
 480                         LPCSTR cmdline, BYTE len, HANDLE *hThread )
 481 {
 482     TDB *pTask;
 483
 484     if (!(pTask = TASK_Create( pModule, cmdShow, cmdline, len ))) return 0;
 485     if (!(*hThread = CreateThread( NULL, 0, task_start, pTask, 0, NULL )))
 486     {
 487         TASK_DeleteTask( pTask->hSelf );
 488         return 0;
 489     }
 490     return pTask->hSelf;
 491 }
 492
 493
 494 /***********************************************************************
 495  *           TASK_GetTaskFromThread
 496  */
 497 HTASK16 TASK_GetTaskFromThread( DWORD thread )
 498 {
 499     TDB *p = TASK_GetPtr( hFirstTask );
 500     while (p)
 501     {
 502         if (p->teb->ClientId.UniqueThread == (HANDLE)thread) return p->hSelf;
 503         p = TASK_GetPtr( p->hNext );
 504     }
 505     return 0;
 506 }
 507
 508
 509 /***********************************************************************
 510  *           TASK_CallTaskSignalProc
 511  */
 512 static void TASK_CallTaskSignalProc( UINT16 uCode, HANDLE16 hTaskOrModule )
 513 {
 514     WORD args[5];
 515     TDB *pTask = TASK_GetCurrent();
 516
 517     if ( !pTask || !pTask->userhandler ) return;
 518
 519     args[4] = hTaskOrModule;
 520     args[3] = uCode;
 521     args[2] = 0;
 522     args[1] = pTask->hInstance;
 523     args[0] = pTask->hQueue;
 524     WOWCallback16Ex( (DWORD)pTask->userhandler, WCB16_PASCAL, sizeof(args), args, NULL );
 525 }
 526
 527
 528 /***********************************************************************
 529  *           TASK_ExitTask
 530  */
 531 void TASK_ExitTask(void)
 532 {
 533     WIN16_SUBSYSTEM_TIB *tib;
 534     TDB *pTask;
 535     DWORD lockCount;
 536
 537     /* Enter the Win16Lock to protect global data structures */
 538     _EnterWin16Lock();
 539
 540     pTask = TASK_GetCurrent();
 541     if ( !pTask )
 542     {
 543         _LeaveWin16Lock();
 544         return;
 545     }
 546
 547     TRACE("Killing task %04x\n", pTask->hSelf );
 548
 549     /* Perform USER cleanup */
 550
 551     TASK_CallTaskSignalProc( USIG16_TERMINATION, pTask->hSelf );
 552
 553     /* Remove the task from the list to be sure we never switch back to it */
 554     TASK_UnlinkTask( pTask->hSelf );
 555
 556     if (!nTaskCount || (nTaskCount == 1 && hFirstTask == initial_task))
 557     {
 558         TRACE("this is the last task, exiting\n" );
 559         ExitKernel16();
 560     }
 561
 562     pTask->nEvents = 0;
 563
 564     if ( hLockedTask == pTask->hSelf )
 565         hLockedTask = 0;
 566
 567     TASK_DeleteTask( pTask->hSelf );
 568
 569     if ((tib = NtCurrentTeb()->Tib.SubSystemTib))
 570     {
 571         if (tib->exe_name) RtlFreeUnicodeString( tib->exe_name );
 572         HeapFree( GetProcessHeap(), 0, tib );
 573         NtCurrentTeb()->Tib.SubSystemTib = NULL;
 574     }
 575
 576     /* ... and completely release the Win16Lock, just in case. */
 577     ReleaseThunkLock( &lockCount );
 578 }
 579
 580
 581 /***********************************************************************
 582  *           ExitKernel (KERNEL.2)
 583  *
 584  * Clean-up everything and exit the Wine process.
 585  */
 586 void WINAPI ExitKernel16(void)
 587 {
 588     WriteOutProfiles16();
 589     TerminateProcess( GetCurrentProcess(), 0 );
 590 }
 591
 592
 593 /***********************************************************************
 594  *           InitTask  (KERNEL.91)
 595  *
 596  * Called by the application startup code.
 597  */
 598 void WINAPI InitTask16( CONTEXT86 *context )
 599 {
 600     TDB *pTask;
 601     INSTANCEDATA *pinstance;
 602     SEGPTR ptr;
 603
 604     context->Eax = 0;
 605     if (!(pTask = TASK_GetCurrent())) return;
 606
 607     /* Note: we need to trust that BX/CX contain the stack/heap sizes,
 608        as some apps, notably Visual Basic apps, *modify* the heap/stack
 609        size of the instance data segment before calling InitTask() */
 610
 611     /* Initialize the INSTANCEDATA structure */
 612     pinstance = MapSL( MAKESEGPTR(CURRENT_DS, 0) );
 613     pinstance->stackmin    = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + sizeof( STACK16FRAME );
 614     pinstance->stackbottom = pinstance->stackmin; /* yup, that's right. Confused me too. */
 615     pinstance->stacktop    = ( pinstance->stackmin > LOWORD(context->Ebx) ?
 616                                pinstance->stackmin - LOWORD(context->Ebx) : 0 ) + 150;
 617
 618     /* Initialize the local heap */
 619     if (LOWORD(context->Ecx))
 620         LocalInit16( GlobalHandleToSel16(pTask->hInstance), 0, LOWORD(context->Ecx) );
 621
 622     /* Initialize implicitly loaded DLLs */
 623     NE_InitializeDLLs( pTask->hModule );
 624     NE_DllProcessAttach( pTask->hModule );
 625
 626     /* Registers on return are:
 627      * ax     1 if OK, 0 on error
 628      * cx     stack limit in bytes
 629      * dx     cmdShow parameter
 630      * si     instance handle of the previous instance
 631      * di     instance handle of the new task
 632      * es:bx  pointer to command line inside PSP
 633      *
 634      * 0 (=%bp) is pushed on the stack
 635      */
 636     ptr = stack16_push( sizeof(WORD) );
 637     *(WORD *)MapSL(ptr) = 0;
 638     context->Esp -= 2;
 639
 640     context->Eax = 1;
 641
 642     if (!pTask->pdb.cmdLine[0]) context->Ebx = 0x80;
 643     else
 644     {
 645         LPBYTE p = &pTask->pdb.cmdLine[1];
 646         while ((*p == ' ') || (*p == '\t')) p++;
 647         context->Ebx = 0x80 + (p - pTask->pdb.cmdLine);
 648     }
 649     context->Ecx   = pinstance->stacktop;
 650     context->Edx   = pTask->nCmdShow;
 651     context->Esi   = (DWORD)pTask->hPrevInstance;
 652     context->Edi   = (DWORD)pTask->hInstance;
 653     context->SegEs = (WORD)pTask->hPDB;
 654 }
 655
 656
 657 /***********************************************************************
 658  *           WaitEvent  (KERNEL.30)
 659  */
 660 BOOL16 WINAPI WaitEvent16( HTASK16 hTask )
 661 {
 662     TDB *pTask;
 663
 664     if (!hTask) hTask = GetCurrentTask();
 665     pTask = TASK_GetPtr( hTask );
 666
 667     if (pTask->flags & TDBF_WIN32)
 668     {
 669         FIXME("called for Win32 thread (%04lx)!\n", GetCurrentThreadId());
 670         return TRUE;
 671     }
 672
 673     if (pTask->nEvents > 0)
 674     {
 675         pTask->nEvents--;
 676         return FALSE;
 677     }
 678
 679     if (pTask->teb == NtCurrentTeb())
 680     {
 681         DWORD lockCount;
 682
 683         NtResetEvent( pTask->hEvent, NULL );
 684         ReleaseThunkLock( &lockCount );
 685         SYSLEVEL_CheckNotLevel( 1 );
 686         WaitForSingleObject( pTask->hEvent, INFINITE );
 687         RestoreThunkLock( lockCount );
 688         if (pTask->nEvents > 0) pTask->nEvents--;
 689     }
 690     else FIXME("for other task %04x cur=%04x\n",pTask->hSelf,GetCurrentTask());
 691
 692     return TRUE;
 693 }
 694
 695
 696 /***********************************************************************
 697  *           PostEvent  (KERNEL.31)
 698  */
 699 void WINAPI PostEvent16( HTASK16 hTask )
 700 {
 701     TDB *pTask;
 702
 703     if (!hTask) hTask = GetCurrentTask();
 704     if (!(pTask = TASK_GetPtr( hTask ))) return;
 705
 706     if (pTask->flags & TDBF_WIN32)
 707     {
 708         FIXME("called for Win32 thread (%04lx)!\n", (DWORD)pTask->teb->ClientId.UniqueThread );
 709         return;
 710     }
 711
 712     pTask->nEvents++;
 713
 714     if (pTask->nEvents == 1) NtSetEvent( pTask->hEvent, NULL );
 715 }
 716
 717
 718 /***********************************************************************
 719  *           SetPriority  (KERNEL.32)
 720  */
 721 void WINAPI SetPriority16( HTASK16 hTask, INT16 delta )
 722 {
 723     TDB *pTask;
 724     INT16 newpriority;
 725
 726     if (!hTask) hTask = GetCurrentTask();
 727     if (!(pTask = TASK_GetPtr( hTask ))) return;
 728     newpriority = pTask->priority + delta;
 729     if (newpriority < -32) newpriority = -32;
 730     else if (newpriority > 15) newpriority = 15;
 731
 732     pTask->priority = newpriority + 1;
 733     TASK_UnlinkTask( pTask->hSelf );
 734     TASK_LinkTask( pTask->hSelf );
 735     pTask->priority--;
 736 }
 737
 738
 739 /***********************************************************************
 740  *           LockCurrentTask  (KERNEL.33)
 741  */
 742 HTASK16 WINAPI LockCurrentTask16( BOOL16 bLock )
 743 {
 744     if (bLock) hLockedTask = GetCurrentTask();
 745     else hLockedTask = 0;
 746     return hLockedTask;
 747 }
 748
 749
 750 /***********************************************************************
 751  *           IsTaskLocked  (KERNEL.122)
 752  */
 753 HTASK16 WINAPI IsTaskLocked16(void)
 754 {
 755     return hLockedTask;
 756 }
 757
 758
 759 /***********************************************************************
 760  *           OldYield  (KERNEL.117)
 761  */
 762 void WINAPI OldYield16(void)
 763 {
 764    DWORD count;
 765
 766    ReleaseThunkLock(&count);
 767    RestoreThunkLock(count);
 768 }
 769
 770 /***********************************************************************
 771  *           WIN32_OldYield  (KERNEL.447)
 772  */
 773 void WINAPI WIN32_OldYield16(void)
 774 {
 775    DWORD count;
 776
 777    ReleaseThunkLock(&count);
 778    RestoreThunkLock(count);
 779 }
 780
 781 /***********************************************************************
 782  *           DirectedYield  (KERNEL.150)
 783  */
 784 void WINAPI DirectedYield16( HTASK16 hTask )
 785 {
 786     OldYield16();
 787 }
 788
 789 /***********************************************************************
 790  *           Yield  (KERNEL.29)
 791  */
 792 void WINAPI Yield16(void)
 793 {
 794     TDB *pCurTask = TASK_GetCurrent();
 795
 796     if (pCurTask && pCurTask->hQueue)
 797     {
 798         HMODULE mod = GetModuleHandleA( "user32.dll" );
 799         if (mod)
 800         {
 801             FARPROC proc = GetProcAddress( mod, "UserYield16" );
 802             if (proc)
 803             {
 804                 proc();
 805                 return;
 806             }
 807         }
 808     }
 809     OldYield16();
 810 }
 811
 812 /***********************************************************************
 813  *           KERNEL_490  (KERNEL.490)
 814  */
 815 HTASK16 WINAPI KERNEL_490( HTASK16 someTask )
 816 {
 817     if ( !someTask ) return 0;
 818
 819     FIXME("(%04x): stub\n", someTask );
 820     return 0;
 821 }
 822
 823 /***********************************************************************
 824  *           MakeProcInstance  (KERNEL.51)
 825  */
 826 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 827 {
 828     BYTE *thunk,*lfunc;
 829     SEGPTR thunkaddr;
 830     WORD hInstanceSelector;
 831
 832     hInstanceSelector = GlobalHandleToSel16(hInstance);
 833
 834     TRACE("(%08lx, %04x);\n", (DWORD)func, hInstance);
 835
 836     if (!HIWORD(func)) {
 837       /* Win95 actually protects via SEH, but this is better for debugging */
 838       WARN("Ouch ! Called with invalid func 0x%08lx !\n", (DWORD)func);
 839       return (FARPROC16)0;
 840     }
 841
 842     if ( (GlobalHandleToSel16(CURRENT_DS) != hInstanceSelector)
 843       && (hInstance != 0)
 844       && (hInstance != 0xffff) )
 845     {
 846         /* calling MPI with a foreign DSEG is invalid ! */
 847         WARN("Problem with hInstance? Got %04x, using %04x instead\n",
 848                    hInstance,CURRENT_DS);
 849     }
 850
 851     /* Always use the DSEG that MPI was entered with.
 852      * We used to set hInstance to GetTaskDS16(), but this should be wrong
 853      * as CURRENT_DS provides the DSEG value we need.
 854      * ("calling" DS, *not* "task" DS !) */
 855     hInstanceSelector = CURRENT_DS;
 856     hInstance = GlobalHandle16(hInstanceSelector);
 857
 858     /* no thunking for DLLs */
 859     if (NE_GetPtr(FarGetOwner16(hInstance))->ne_flags & NE_FFLAGS_LIBMODULE)
 860         return func;
 861
 862     thunkaddr = TASK_AllocThunk();
 863     if (!thunkaddr) return (FARPROC16)0;
 864     thunk = MapSL( thunkaddr );
 865     lfunc = MapSL( (SEGPTR)func );
 866
 867     TRACE("(%08lx,%04x): got thunk %08lx\n",
 868           (DWORD)func, hInstance, (DWORD)thunkaddr );
 869     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) || /* movw %ds, %ax */
 870         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))    /* pushw %ds, popw %ax */
 871     ) {
 872         WARN("This was the (in)famous \"thunk useless\" warning. We thought we have to overwrite with nop;nop;, but this isn't true.\n");
 873     }
 874
 875     *thunk++ = 0xb8;    /* movw instance, %ax */
 876     *thunk++ = (BYTE)(hInstanceSelector & 0xff);
 877     *thunk++ = (BYTE)(hInstanceSelector >> 8);
 878     *thunk++ = 0xea;    /* ljmp func */
 879     *(DWORD *)thunk = (DWORD)func;
 880     return (FARPROC16)thunkaddr;
 881     /* CX reg indicates if thunkaddr != NULL, implement if needed */
 882 }
 883
 884
 885 /***********************************************************************
 886  *           FreeProcInstance  (KERNEL.52)
 887  */
 888 void WINAPI FreeProcInstance16( FARPROC16 func )
 889 {
 890     TRACE("(%08lx)\n", (DWORD)func );
 891     TASK_FreeThunk( (SEGPTR)func );
 892 }
 893
 894 /**********************************************************************
 895  *          TASK_GetCodeSegment
 896  *
 897  * Helper function for GetCodeHandle/GetCodeInfo: Retrieve the module
 898  * and logical segment number of a given code segment.
 899  *
 900  * 'proc' either *is* already a pair of module handle and segment number,
 901  * in which case there's nothing to do.  Otherwise, it is a pointer to
 902  * a function, and we need to retrieve the code segment.  If the pointer
 903  * happens to point to a thunk, we'll retrieve info about the code segment
 904  * where the function pointed to by the thunk resides, not the thunk itself.
 905  *
 906  * FIXME: if 'proc' is a SNOOP16 return stub, we should retrieve info about
 907  *        the function the snoop code will return to ...
 908  *
 909  */
 910 static BOOL TASK_GetCodeSegment( FARPROC16 proc, NE_MODULE **ppModule,
 911                                  SEGTABLEENTRY **ppSeg, int *pSegNr )
 912 {
 913     NE_MODULE *pModule = NULL;
 914     SEGTABLEENTRY *pSeg = NULL;
 915     int segNr=0;
 916
 917     /* Try pair of module handle / segment number */
 918     pModule = (NE_MODULE *) GlobalLock16( HIWORD( proc ) );
 919     if ( pModule && pModule->ne_magic == IMAGE_OS2_SIGNATURE )
 920     {
 921         segNr = LOWORD( proc );
 922         if ( segNr && segNr <= pModule->ne_cseg )
 923             pSeg = NE_SEG_TABLE( pModule ) + segNr-1;
 924     }
 925
 926     /* Try thunk or function */
 927     else
 928     {
 929         BYTE *thunk = MapSL( (SEGPTR)proc );
 930         WORD selector;
 931
 932         if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
 933             selector = thunk[6] + (thunk[7] << 8);
 934         else
 935             selector = HIWORD( proc );
 936
 937         pModule = NE_GetPtr( GlobalHandle16( selector ) );
 938         pSeg = pModule? NE_SEG_TABLE( pModule ) : NULL;
 939
 940         if ( pModule )
 941             for ( segNr = 1; segNr <= pModule->ne_cseg; segNr++, pSeg++ )
 942                 if ( GlobalHandleToSel16(pSeg->hSeg) == selector )
 943                     break;
 944
 945         if ( pModule && segNr > pModule->ne_cseg )
 946             pSeg = NULL;
 947     }
 948
 949     /* Abort if segment not found */
 950
 951     if ( !pModule || !pSeg )
 952         return FALSE;
 953
 954     /* Return segment data */
 955
 956     if ( ppModule ) *ppModule = pModule;
 957     if ( ppSeg    ) *ppSeg    = pSeg;
 958     if ( pSegNr   ) *pSegNr   = segNr;
 959
 960     return TRUE;
 961 }
 962
 963 /**********************************************************************
 964  *          GetCodeHandle    (KERNEL.93)
 965  */
 966 HANDLE16 WINAPI GetCodeHandle16( FARPROC16 proc )
 967 {
 968     SEGTABLEENTRY *pSeg;
 969
 970     if ( !TASK_GetCodeSegment( proc, NULL, &pSeg, NULL ) )
 971         return (HANDLE16)0;
 972
 973     return pSeg->hSeg;
 974 }
 975
 976 /**********************************************************************
 977  *          GetCodeInfo    (KERNEL.104)
 978  */
 979 BOOL16 WINAPI GetCodeInfo16( FARPROC16 proc, SEGINFO *segInfo )
 980 {
 981     NE_MODULE *pModule;
 982     SEGTABLEENTRY *pSeg;
 983     int segNr;
 984
 985     if ( !TASK_GetCodeSegment( proc, &pModule, &pSeg, &segNr ) )
 986         return FALSE;
 987
 988     /* Fill in segment information */
 989
 990     segInfo->offSegment = pSeg->filepos;
 991     segInfo->cbSegment  = pSeg->size;
 992     segInfo->flags      = pSeg->flags;
 993     segInfo->cbAlloc    = pSeg->minsize;
 994     segInfo->h          = pSeg->hSeg;
 995     segInfo->alignShift = pModule->ne_align;
 996
 997     if ( segNr == pModule->ne_autodata )
 998         segInfo->cbAlloc += pModule->ne_heap + pModule->ne_stack;
 999
1000     /* Return module handle in %es */
1001
1002     CURRENT_STACK16->es = GlobalHandleToSel16( pModule->self );
1003
1004     return TRUE;
1005 }
1006
1007
1008 /**********************************************************************
1009  *          DefineHandleTable    (KERNEL.94)
1010  */
1011 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1012 {
1013     FIXME("(%04x): stub ?\n", wOffset);
1014     return TRUE;
1015 }
1016
1017
1018 /***********************************************************************
1019  *           SetTaskQueue  (KERNEL.34)
1020  */
1021 HQUEUE16 WINAPI SetTaskQueue16( HTASK16 hTask, HQUEUE16 hQueue )
1022 {
1023     FIXME( "stub, should not get called\n" );
1024     return 0xbeef;
1025 }
1026
1027
1028 /***********************************************************************
1029  *           GetTaskQueue  (KERNEL.35)
1030  */
1031 HQUEUE16 WINAPI GetTaskQueue16( HTASK16 hTask )
1032 {
1033     FIXME( "stub, should not get called\n" );
1034     return 0xbeef;
1035 }
1036
1037 /***********************************************************************
1038  *           SetThreadQueue  (KERNEL.463)
1039  */
1040 HQUEUE16 WINAPI SetThreadQueue16( DWORD thread, HQUEUE16 hQueue )
1041 {
1042     FIXME( "stub, should not get called\n" );
1043     return 0xbeef;
1044 }
1045
1046 /***********************************************************************
1047  *           GetThreadQueue  (KERNEL.464)
1048  */
1049 HQUEUE16 WINAPI GetThreadQueue16( DWORD thread )
1050 {
1051     FIXME( "stub, should not get called\n" );
1052     return 0xbeef;
1053 }
1054
1055 /***********************************************************************
1056  *           SetFastQueue  (KERNEL.624)
1057  */
1058 VOID WINAPI SetFastQueue16( DWORD thread, HQUEUE16 hQueue )
1059 {
1060     FIXME( "stub, should not get called\n" );
1061 }
1062
1063 /***********************************************************************
1064  *           GetFastQueue  (KERNEL.625)
1065  */
1066 HQUEUE16 WINAPI GetFastQueue16( void )
1067 {
1068     FIXME( "stub, should not get called\n" );
1069     return 0xbeef;
1070 }
1071
1072 /***********************************************************************
1073  *           SwitchStackTo   (KERNEL.108)
1074  */
1075 void WINAPI SwitchStackTo16( WORD seg, WORD ptr, WORD top )
1076 {
1077     STACK16FRAME *oldFrame, *newFrame;
1078     INSTANCEDATA *pData;
1079     UINT16 copySize;
1080
1081     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1082     TRACE("old=%04x:%04x new=%04x:%04x\n",
1083           SELECTOROF( NtCurrentTeb()->WOW32Reserved ),
1084           OFFSETOF( NtCurrentTeb()->WOW32Reserved ), seg, ptr );
1085
1086     /* Save the old stack */
1087
1088     oldFrame = CURRENT_STACK16;
1089     /* pop frame + args and push bp */
1090     pData->old_ss_sp   = (SEGPTR)NtCurrentTeb()->WOW32Reserved + sizeof(STACK16FRAME)
1091                            + 2 * sizeof(WORD);
1092     *(WORD *)MapSL(pData->old_ss_sp) = oldFrame->bp;
1093     pData->stacktop    = top;
1094     pData->stackmin    = ptr;
1095     pData->stackbottom = ptr;
1096
1097     /* Switch to the new stack */
1098
1099     /* Note: we need to take the 3 arguments into account; otherwise,
1100      * the stack will underflow upon return from this function.
1101      */
1102     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1103     copySize += 3 * sizeof(WORD) + sizeof(STACK16FRAME);
1104     NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR( seg, ptr - copySize );
1105     newFrame = CURRENT_STACK16;
1106
1107     /* Copy the stack frame and the local variables to the new stack */
1108
1109     memmove( newFrame, oldFrame, copySize );
1110     newFrame->bp = ptr;
1111     *(WORD *)MapSL( MAKESEGPTR( seg, ptr ) ) = 0;  /* clear previous bp */
1112 }
1113
1114
1115 /***********************************************************************
1116  *           SwitchStackBack   (KERNEL.109)
1117  */
1118 void WINAPI SwitchStackBack16( CONTEXT86 *context )
1119 {
1120     STACK16FRAME *oldFrame, *newFrame;
1121     INSTANCEDATA *pData;
1122
1123     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(NtCurrentTeb()->WOW32Reserved))))
1124         return;
1125     if (!pData->old_ss_sp)
1126     {
1127         WARN("No previous SwitchStackTo\n" );
1128         return;
1129     }
1130     TRACE("restoring stack %04x:%04x\n",
1131           SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1132
1133     oldFrame = CURRENT_STACK16;
1134
1135     /* Pop bp from the previous stack */
1136
1137     context->Ebp = (context->Ebp & ~0xffff) | *(WORD *)MapSL(pData->old_ss_sp);
1138     pData->old_ss_sp += sizeof(WORD);
1139
1140     /* Switch back to the old stack */
1141
1142     NtCurrentTeb()->WOW32Reserved = (void *)(pData->old_ss_sp - sizeof(STACK16FRAME));
1143     context->SegSs = SELECTOROF(pData->old_ss_sp);
1144     context->Esp   = OFFSETOF(pData->old_ss_sp) - sizeof(DWORD); /*ret addr*/
1145     pData->old_ss_sp = 0;
1146
1147     /* Build a stack frame for the return */
1148
1149     newFrame = CURRENT_STACK16;
1150     newFrame->frame32     = oldFrame->frame32;
1151     newFrame->module_cs   = oldFrame->module_cs;
1152     newFrame->callfrom_ip = oldFrame->callfrom_ip;
1153     newFrame->entry_ip    = oldFrame->entry_ip;
1154 }
1155
1156
1157 /***********************************************************************
1158  *           GetTaskQueueDS  (KERNEL.118)
1159  */
1160 void WINAPI GetTaskQueueDS16(void)
1161 {
1162     CURRENT_STACK16->ds = GlobalHandleToSel16( GetTaskQueue16(0) );
1163 }
1164
1165
1166 /***********************************************************************
1167  *           GetTaskQueueES  (KERNEL.119)
1168  */
1169 void WINAPI GetTaskQueueES16(void)
1170 {
1171     CURRENT_STACK16->es = GlobalHandleToSel16( GetTaskQueue16(0) );
1172 }
1173
1174
1175 /***********************************************************************
1176  *           GetCurrentTask   (KERNEL32.@)
1177  */
1178 HTASK16 WINAPI GetCurrentTask(void)
1179 {
1180     return NtCurrentTeb()->htask16;
1181 }
1182
1183 /***********************************************************************
1184  *           GetCurrentTask   (KERNEL.36)
1185  */
1186 DWORD WINAPI WIN16_GetCurrentTask(void)
1187 {
1188     /* This is the version used by relay code; the first task is */
1189     /* returned in the high word of the result */
1190     return MAKELONG( GetCurrentTask(), hFirstTask );
1191 }
1192
1193
1194 /***********************************************************************
1195  *           GetCurrentPDB   (KERNEL.37)
1196  *
1197  * UNDOC: returns PSP of KERNEL in high word
1198  */
1199 DWORD WINAPI GetCurrentPDB16(void)
1200 {
1201     TDB *pTask;
1202
1203     if (!(pTask = TASK_GetCurrent())) return 0;
1204     return MAKELONG(pTask->hPDB, 0); /* FIXME */
1205 }
1206
1207
1208 /***********************************************************************
1209  *           GetCurPID   (KERNEL.157)
1210  */
1211 DWORD WINAPI GetCurPID16( DWORD unused )
1212 {
1213     return 0;
1214 }
1215
1216
1217 /***********************************************************************
1218  *           GetInstanceData   (KERNEL.54)
1219  */
1220 INT16 WINAPI GetInstanceData16( HINSTANCE16 instance, WORD buffer, INT16 len )
1221 {
1222     char *ptr = (char *)GlobalLock16( instance );
1223     if (!ptr || !len) return 0;
1224     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1225     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1226     return len;
1227 }
1228
1229
1230 /***********************************************************************
1231  *           GetExeVersion   (KERNEL.105)
1232  */
1233 WORD WINAPI GetExeVersion16(void)
1234 {
1235     TDB *pTask;
1236
1237     if (!(pTask = TASK_GetCurrent())) return 0;
1238     return pTask->version;
1239 }
1240
1241
1242 /***********************************************************************
1243  *           SetErrorMode   (KERNEL.107)
1244  */
1245 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1246 {
1247     TDB *pTask;
1248     if (!(pTask = TASK_GetCurrent())) return 0;
1249     pTask->error_mode = mode;
1250     return SetErrorMode( mode );
1251 }
1252
1253
1254 /***********************************************************************
1255  *           GetNumTasks   (KERNEL.152)
1256  */
1257 UINT16 WINAPI GetNumTasks16(void)
1258 {
1259     return nTaskCount;
1260 }
1261
1262
1263 /***********************************************************************
1264  *           GetTaskDS   (KERNEL.155)
1265  *
1266  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1267  * I don't think we need to bother with this.
1268  */
1269 HINSTANCE16 WINAPI GetTaskDS16(void)
1270 {
1271     TDB *pTask;
1272
1273     if (!(pTask = TASK_GetCurrent())) return 0;
1274     return GlobalHandleToSel16(pTask->hInstance);
1275 }
1276
1277 /***********************************************************************
1278  *           GetDummyModuleHandleDS   (KERNEL.602)
1279  */
1280 WORD WINAPI GetDummyModuleHandleDS16(void)
1281 {
1282     TDB *pTask;
1283     WORD selector;
1284
1285     if (!(pTask = TASK_GetCurrent())) return 0;
1286     if (!(pTask->flags & TDBF_WIN32)) return 0;
1287     selector = GlobalHandleToSel16( pTask->hModule );
1288     CURRENT_DS = selector;
1289     return selector;
1290 }
1291
1292 /***********************************************************************
1293  *           IsTask   (KERNEL.320)
1294  */
1295 BOOL16 WINAPI IsTask16( HTASK16 hTask )
1296 {
1297     TDB *pTask;
1298
1299     if (!(pTask = TASK_GetPtr( hTask ))) return FALSE;
1300     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1301     return (pTask->magic == TDB_MAGIC);
1302 }
1303
1304
1305 /***********************************************************************
1306  *           IsWinOldApTask   (KERNEL.158)
1307  */
1308 BOOL16 WINAPI IsWinOldApTask16( HTASK16 hTask )
1309 {
1310     /* should return bit 0 of byte 0x48 in PSP */
1311     return FALSE;
1312 }
1313
1314 /***********************************************************************
1315  *           SetTaskSignalProc   (KERNEL.38)
1316  */
1317 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1318 {
1319     TDB *pTask;
1320     FARPROC16 oldProc;
1321
1322     if (!hTask) hTask = GetCurrentTask();
1323     if (!(pTask = TASK_GetPtr( hTask ))) return NULL;
1324     oldProc = pTask->userhandler;
1325     pTask->userhandler = proc;
1326     return oldProc;
1327 }
1328
1329 /***********************************************************************
1330  *           SetSigHandler   (KERNEL.140)
1331  */
1332 WORD WINAPI SetSigHandler16( FARPROC16 newhandler, FARPROC16* oldhandler,
1333                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1334 {
1335     FIXME("(%p,%p,%p,%d,%d), unimplemented.\n",
1336           newhandler,oldhandler,oldmode,newmode,flag );
1337
1338     if (flag != 1) return 0;
1339     if (!newmode) newhandler = NULL;  /* Default handler */
1340     if (newmode != 4)
1341     {
1342         TDB *pTask;
1343
1344         if (!(pTask = TASK_GetCurrent())) return 0;
1345         if (oldmode) *oldmode = pTask->signal_flags;
1346         pTask->signal_flags = newmode;
1347         if (oldhandler) *oldhandler = pTask->sighandler;
1348         pTask->sighandler = newhandler;
1349     }
1350     return 0;
1351 }
1352
1353
1354 /***********************************************************************
1355  *           GlobalNotify   (KERNEL.154)
1356  *
1357  * Note that GlobalNotify does _not_ return the old NotifyProc
1358  * -- contrary to LocalNotify !!
1359  */
1360 VOID WINAPI GlobalNotify16( FARPROC16 proc )
1361 {
1362     TDB *pTask;
1363
1364     if (!(pTask = TASK_GetCurrent())) return;
1365     pTask->discardhandler = proc;
1366 }
1367
1368
1369 /***********************************************************************
1370  *           GetExePtrHelper
1371  */
1372 static inline HMODULE16 GetExePtrHelper( HANDLE16 handle, HTASK16 *hTask )
1373 {
1374     char *ptr;
1375     HANDLE16 owner;
1376
1377       /* Check for module handle */
1378
1379     if (!(ptr = GlobalLock16( handle ))) return 0;
1380     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return handle;
1381
1382       /* Search for this handle inside all tasks */
1383
1384     *hTask = hFirstTask;
1385     while (*hTask)
1386     {
1387         TDB *pTask = TASK_GetPtr( *hTask );
1388         if ((*hTask == handle) ||
1389             (pTask->hInstance == handle) ||
1390             (pTask->hQueue == handle) ||
1391             (pTask->hPDB == handle)) return pTask->hModule;
1392         *hTask = pTask->hNext;
1393     }
1394
1395       /* Check the owner for module handle */
1396
1397     owner = FarGetOwner16( handle );
1398     if (!(ptr = GlobalLock16( owner ))) return 0;
1399     if (((NE_MODULE *)ptr)->ne_magic == IMAGE_OS2_SIGNATURE) return owner;
1400
1401       /* Search for the owner inside all tasks */
1402
1403     *hTask = hFirstTask;
1404     while (*hTask)
1405     {
1406         TDB *pTask = TASK_GetPtr( *hTask );
1407         if ((*hTask == owner) ||
1408             (pTask->hInstance == owner) ||
1409             (pTask->hQueue == owner) ||
1410             (pTask->hPDB == owner)) return pTask->hModule;
1411         *hTask = pTask->hNext;
1412     }
1413
1414     return 0;
1415 }
1416
1417 /***********************************************************************
1418  *           GetExePtr   (KERNEL.133)
1419  */
1420 HMODULE16 WINAPI WIN16_GetExePtr( HANDLE16 handle )
1421 {
1422     HTASK16 hTask = 0;
1423     HMODULE16 hModule = GetExePtrHelper( handle, &hTask );
1424     STACK16FRAME *frame = CURRENT_STACK16;
1425     frame->ecx = hModule;
1426     if (hTask) frame->es = hTask;
1427     return hModule;
1428 }
1429
1430
1431 /***********************************************************************
1432  *           K228   (KERNEL.228)
1433  */
1434 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1435 {
1436     HTASK16 hTask = 0;
1437     return GetExePtrHelper( handle, &hTask );
1438 }
1439
1440
1441 /***********************************************************************
1442  *           TaskFirst   (TOOLHELP.63)
1443  */
1444 BOOL16 WINAPI TaskFirst16( TASKENTRY *lpte )
1445 {
1446     lpte->hNext = hFirstTask;
1447     return TaskNext16( lpte );
1448 }
1449
1450
1451 /***********************************************************************
1452  *           TaskNext   (TOOLHELP.64)
1453  */
1454 BOOL16 WINAPI TaskNext16( TASKENTRY *lpte )
1455 {
1456     TDB *pTask;
1457     INSTANCEDATA *pInstData;
1458
1459     TRACE_(toolhelp)("(%p): task=%04x\n", lpte, lpte->hNext );
1460     if (!lpte->hNext) return FALSE;
1461
1462     /* make sure that task and hInstance are valid (skip initial Wine task !) */
1463     while (1) {
1464         pTask = TASK_GetPtr( lpte->hNext );
1465         if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1466         if (pTask->hInstance)
1467             break;
1468         lpte->hNext = pTask->hNext;
1469     }
1470     pInstData = MapSL( MAKESEGPTR( GlobalHandleToSel16(pTask->hInstance), 0 ) );
1471     lpte->hTask         = lpte->hNext;
1472     lpte->hTaskParent   = pTask->hParent;
1473     lpte->hInst         = pTask->hInstance;
1474     lpte->hModule       = pTask->hModule;
1475     lpte->wSS           = SELECTOROF( pTask->teb->WOW32Reserved );
1476     lpte->wSP           = OFFSETOF( pTask->teb->WOW32Reserved );
1477     lpte->wStackTop     = pInstData->stacktop;
1478     lpte->wStackMinimum = pInstData->stackmin;
1479     lpte->wStackBottom  = pInstData->stackbottom;
1480     lpte->wcEvents      = pTask->nEvents;
1481     lpte->hQueue        = pTask->hQueue;
1482     lstrcpynA( lpte->szModule, pTask->module_name, sizeof(lpte->szModule) );
1483     lpte->wPSPOffset    = 0x100;  /*??*/
1484     lpte->hNext         = pTask->hNext;
1485     return TRUE;
1486 }
1487
1488
1489 /***********************************************************************
1490  *           TaskFindHandle   (TOOLHELP.65)
1491  */
1492 BOOL16 WINAPI TaskFindHandle16( TASKENTRY *lpte, HTASK16 hTask )
1493 {
1494     lpte->hNext = hTask;
1495     return TaskNext16( lpte );
1496 }
1497
1498
1499 typedef INT (WINAPI *MessageBoxA_funcptr)(HWND hWnd, LPCSTR text, LPCSTR title, UINT type);
1500
1501 /**************************************************************************
1502  *           FatalAppExit   (KERNEL.137)
1503  */
1504 void WINAPI FatalAppExit16( UINT16 action, LPCSTR str )
1505 {
1506     TDB *pTask = TASK_GetCurrent();
1507
1508     if (!pTask || !(pTask->error_mode & SEM_NOGPFAULTERRORBOX))
1509     {
1510         HMODULE mod = GetModuleHandleA( "user32.dll" );
1511         if (mod)
1512         {
1513             MessageBoxA_funcptr pMessageBoxA = (MessageBoxA_funcptr)GetProcAddress( mod, "MessageBoxA" );
1514             if (pMessageBoxA)
1515             {
1516                 pMessageBoxA( 0, str, NULL, MB_SYSTEMMODAL | MB_OK );
1517                 goto done;
1518             }
1519         }
1520         ERR( "%s\n", debugstr_a(str) );
1521     }
1522  done:
1523     ExitThread(0xff);
1524 }
1525
1526
1527 /***********************************************************************
1528  *           TerminateApp   (TOOLHELP.77)
1529  *
1530  * See "Undocumented Windows".
1531  */
1532 void WINAPI TerminateApp16(HTASK16 hTask, WORD wFlags)
1533 {
1534     if (hTask && hTask != GetCurrentTask())
1535     {
1536         FIXME("cannot terminate task %x\n", hTask);
1537         return;
1538     }
1539
1540     if (wFlags & NO_UAE_BOX)
1541     {
1542         UINT16 old_mode;
1543         old_mode = SetErrorMode16(0);
1544         SetErrorMode16(old_mode|SEM_NOGPFAULTERRORBOX);
1545     }
1546     FatalAppExit16( 0, NULL );
1547
1548     /* hmm, we're still alive ?? */
1549
1550     /* check undocumented flag */
1551     if (!(wFlags & 0x8000))
1552         TASK_CallTaskSignalProc( USIG16_TERMINATION, hTask );
1553
1554     /* UndocWin says to call int 0x21/0x4c exit=0xff here,
1555        but let's just call ExitThread */
1556     ExitThread(0xff);
1557 }
1558
1559
1560 /***********************************************************************
1561  *           GetAppCompatFlags   (KERNEL.354)
1562  */
1563 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1564 {
1565     TDB *pTask;
1566
1567     if (!hTask) hTask = GetCurrentTask();
1568     if (!(pTask=TASK_GetPtr( hTask ))) return 0;
1569     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1570     return pTask->compat_flags;
1571 }
1572
1573
1574 /***********************************************************************
1575  *           GetDOSEnvironment     (KERNEL.131)
1576  *
1577  * Note: the environment is allocated once, it doesn't track changes
1578  * made using the Win32 API. This shouldn't matter.
1579  *
1580  * Format of a 16-bit environment block:
1581  * ASCIIZ   string 1 (xx=yy format)
1582  * ...
1583  * ASCIIZ   string n
1584  * BYTE     0
1585  * WORD     1
1586  * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
1587  */
1588 SEGPTR WINAPI GetDOSEnvironment16(void)
1589 {
1590     static const char ENV_program_name[] = "C:\\WINDOWS\\SYSTEM\\KRNL386.EXE";
1591     static HGLOBAL16 handle;  /* handle to the 16 bit environment */
1592
1593     if (!handle)
1594     {
1595         DWORD size;
1596         LPSTR p, env;
1597
1598         p = env = GetEnvironmentStringsA();
1599         while (*p) p += strlen(p) + 1;
1600         p++;  /* skip last null */
1601         size = (p - env) + sizeof(WORD) + sizeof(ENV_program_name);
1602         handle = GlobalAlloc16( GMEM_FIXED, size );
1603         if (handle)
1604         {
1605             WORD one = 1;
1606             LPSTR env16 = GlobalLock16( handle );
1607             memcpy( env16, env, p - env );
1608             memcpy( env16 + (p - env), &one, sizeof(one));
1609             memcpy( env16 + (p - env) + sizeof(WORD), ENV_program_name, sizeof(ENV_program_name));
1610             GlobalUnlock16( handle );
1611         }
1612         FreeEnvironmentStringsA( env );
1613     }
1614     return K32WOWGlobalLock16( handle );
1615 }