loader/task.c

   1 /*
   2  * Task functions
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 #include "windows.h"
  12 #include "user.h"
  13 #include "callback.h"
  14 #include "drive.h"
  15 #include "file.h"
  16 #include "global.h"
  17 #include "instance.h"
  18 #include "message.h"
  19 #include "miscemu.h"
  20 #include "module.h"
  21 #include "neexe.h"
  22 #include "peexe.h"
  23 #include "pe_image.h"
  24 #include "process.h"
  25 #include "queue.h"
  26 #include "selectors.h"
  27 #include "stackframe.h"
  28 #include "thread.h"
  29 #include "toolhelp.h"
  30 #include "winnt.h"
  31 #include "thread.h"
  32 #include "debug.h"
  33 #include "dde_proc.h"
  34
  35   /* Min. number of thunks allocated when creating a new segment */
  36 #define MIN_THUNKS  32
  37
  38 extern INT32 WINSOCK_DeleteTaskWSI( TDB* pTask, struct _WSINFO* );
  39 extern BOOL32 MODULE_FreeModule( HMODULE16 hModule, TDB* ptaskContext );
  40
  41   /* Pointer to function to switch to a larger stack */
  42 int (*IF1632_CallLargeStack)( int (*func)(), void *arg ) = NULL;
  43
  44 static HTASK16 hFirstTask = 0;
  45 static HTASK16 hCurrentTask = 0;
  46 static HTASK16 hTaskToKill = 0;
  47 static HTASK16 hLockedTask = 0;
  48 static UINT16 nTaskCount = 0;
  49 static HGLOBAL16 hDOSEnvironment = 0;
  50
  51 static HGLOBAL16 TASK_CreateDOSEnvironment(void);
  52 static void      TASK_YieldToSystem(TDB*);
  53
  54
  55 /***********************************************************************
  56  *           TASK_Init
  57  */
  58 BOOL32 TASK_Init(void)
  59 {
  60     if (!(hDOSEnvironment = TASK_CreateDOSEnvironment()))
  61         fprintf( stderr, "Not enough memory for DOS Environment\n" );
  62     return (hDOSEnvironment != 0);
  63 }
  64
  65
  66 /***********************************************************************
  67  *           TASK_GetNextTask
  68  */
  69 HTASK16 TASK_GetNextTask( HTASK16 hTask )
  70 {
  71     TDB* pTask = (TDB*)GlobalLock16(hTask);
  72
  73     if (pTask->hNext) return pTask->hNext;
  74     return (hFirstTask != hTask) ? hFirstTask : 0;
  75 }
  76
  77
  78 /***********************************************************************
  79  *           TASK_CreateDOSEnvironment
  80  *
  81  * Create the original DOS environment.
  82  */
  83 static HGLOBAL16 TASK_CreateDOSEnvironment(void)
  84 {
  85     static const char program_name[] = "KRNL386.EXE";
  86     char **e, *p;
  87     int initial_size, size, i, winpathlen, sysdirlen;
  88     HGLOBAL16 handle;
  89
  90     extern char **environ;
  91
  92     /* DOS environment format:
  93      * ASCIIZ   string 1
  94      * ASCIIZ   string 2
  95      * ...
  96      * ASCIIZ   string n
  97      * ASCIIZ   PATH=xxx
  98      * BYTE     0
  99      * WORD     1
 100      * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
 101      */
 102
 103     /* First compute the size of the fixed part of the environment */
 104
 105     for (i = winpathlen = 0; ; i++)
 106     {
 107         int len = DIR_GetDosPath( i, NULL, 0 );
 108         if (!len) break;
 109         winpathlen += len + 1;
 110     }
 111     if (!winpathlen) winpathlen = 1;
 112     sysdirlen  = GetSystemDirectory32A( NULL, 0 ) + 1;
 113     initial_size = 5 + winpathlen +           /* PATH=xxxx */
 114                    1 +                        /* BYTE 0 at end */
 115                    sizeof(WORD) +             /* WORD 1 */
 116                    sysdirlen +                /* program directory */
 117                    strlen(program_name) + 1;  /* program name */
 118
 119     /* Compute the total size of the Unix environment (except path) */
 120
 121     for (e = environ, size = initial_size; *e; e++)
 122     {
 123         if (lstrncmpi32A(*e, "path=", 5))
 124         {
 125             int len = strlen(*e) + 1;
 126             if (size + len >= 32767)
 127             {
 128                 fprintf( stderr, "Warning: environment larger than 32k.\n" );
 129                 break;
 130             }
 131             size += len;
 132         }
 133     }
 134
 135
 136     /* Now allocate the environment */
 137
 138     if (!(handle = GlobalAlloc16( GMEM_FIXED, size ))) return 0;
 139     p = (char *)GlobalLock16( handle );
 140
 141     /* And fill it with the Unix environment */
 142
 143     for (e = environ, size = initial_size; *e; e++)
 144     {
 145         if (lstrncmpi32A(*e, "path=", 5))
 146         {
 147             int len = strlen(*e) + 1;
 148             if (size + len >= 32767) break;
 149             strcpy( p, *e );
 150             size += len;
 151             p    += len;
 152         }
 153     }
 154
 155     /* Now add the path */
 156
 157     strcpy( p, "PATH=" );
 158     for (i = 0, p += 5; ; i++)
 159     {
 160         if (!DIR_GetDosPath( i, p, winpathlen )) break;
 161         p += strlen(p);
 162         *p++ = ';';
 163     }
 164     if (p[-1] == ';') p[-1] = '\0';
 165     else p++;
 166
 167     /* Now add the program name */
 168
 169     *p++ = '\0';
 170     PUT_WORD( p, 1 );
 171     p += sizeof(WORD);
 172     GetSystemDirectory32A( p, sysdirlen );
 173     strcat( p, "\\" );
 174     strcat( p, program_name );
 175
 176     /* Display it */
 177
 178     p = (char *) GlobalLock16( handle );
 179     TRACE(task, "Master DOS environment at %p\n", p);
 180     for (; *p; p += strlen(p) + 1) TRACE(task, "    %s\n", p);
 181     TRACE(task, "Progname: %s\n", p+3 );
 182
 183     return handle;
 184 }
 185
 186
 187 /***********************************************************************
 188  *           TASK_LinkTask
 189  */
 190 static void TASK_LinkTask( HTASK16 hTask )
 191 {
 192     HTASK16 *prevTask;
 193     TDB *pTask;
 194
 195     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 196     prevTask = &hFirstTask;
 197     while (*prevTask)
 198     {
 199         TDB *prevTaskPtr = (TDB *)GlobalLock16( *prevTask );
 200         if (prevTaskPtr->priority >= pTask->priority) break;
 201         prevTask = &prevTaskPtr->hNext;
 202     }
 203     pTask->hNext = *prevTask;
 204     *prevTask = hTask;
 205     nTaskCount++;
 206 }
 207
 208
 209 /***********************************************************************
 210  *           TASK_UnlinkTask
 211  */
 212 static void TASK_UnlinkTask( HTASK16 hTask )
 213 {
 214     HTASK16 *prevTask;
 215     TDB *pTask;
 216
 217     prevTask = &hFirstTask;
 218     while (*prevTask && (*prevTask != hTask))
 219     {
 220         pTask = (TDB *)GlobalLock16( *prevTask );
 221         prevTask = &pTask->hNext;
 222     }
 223     if (*prevTask)
 224     {
 225         pTask = (TDB *)GlobalLock16( *prevTask );
 226         *prevTask = pTask->hNext;
 227         pTask->hNext = 0;
 228         nTaskCount--;
 229     }
 230 }
 231
 232
 233 /***********************************************************************
 234  *           TASK_CreateThunks
 235  *
 236  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 237  * and containing 'count' entries.
 238  */
 239 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 240 {
 241     int i;
 242     WORD free;
 243     THUNKS *pThunk;
 244
 245     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 246     pThunk->next = 0;
 247     pThunk->magic = THUNK_MAGIC;
 248     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 249     free = pThunk->free;
 250     for (i = 0; i < count-1; i++)
 251     {
 252         free += 8;  /* Offset of next thunk */
 253         pThunk->thunks[4*i] = free;
 254     }
 255     pThunk->thunks[4*i] = 0;  /* Last thunk */
 256 }
 257
 258
 259 /***********************************************************************
 260  *           TASK_AllocThunk
 261  *
 262  * Allocate a thunk for MakeProcInstance().
 263  */
 264 static SEGPTR TASK_AllocThunk( HTASK16 hTask )
 265 {
 266     TDB *pTask;
 267     THUNKS *pThunk;
 268     WORD sel, base;
 269
 270     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
 271     sel = pTask->hCSAlias;
 272     pThunk = &pTask->thunks;
 273     base = (int)pThunk - (int)pTask;
 274     while (!pThunk->free)
 275     {
 276         sel = pThunk->next;
 277         if (!sel)  /* Allocate a new segment */
 278         {
 279             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 280                                 pTask->hPDB, TRUE, FALSE, FALSE );
 281             if (!sel) return (SEGPTR)0;
 282             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 283             pThunk->next = sel;
 284         }
 285         pThunk = (THUNKS *)GlobalLock16( sel );
 286         base = 0;
 287     }
 288     base += pThunk->free;
 289     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 290     return PTR_SEG_OFF_TO_SEGPTR( sel, base );
 291 }
 292
 293
 294 /***********************************************************************
 295  *           TASK_FreeThunk
 296  *
 297  * Free a MakeProcInstance() thunk.
 298  */
 299 static BOOL32 TASK_FreeThunk( HTASK16 hTask, SEGPTR thunk )
 300 {
 301     TDB *pTask;
 302     THUNKS *pThunk;
 303     WORD sel, base;
 304
 305     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
 306     sel = pTask->hCSAlias;
 307     pThunk = &pTask->thunks;
 308     base = (int)pThunk - (int)pTask;
 309     while (sel && (sel != HIWORD(thunk)))
 310     {
 311         sel = pThunk->next;
 312         pThunk = (THUNKS *)GlobalLock16( sel );
 313         base = 0;
 314     }
 315     if (!sel) return FALSE;
 316     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 317     pThunk->free = LOWORD(thunk) - base;
 318     return TRUE;
 319 }
 320
 321
 322 /***********************************************************************
 323  *           TASK_CallToStart
 324  *
 325  * 32-bit entry point for a new task. This function is responsible for
 326  * setting up the registers and jumping to the 16-bit entry point.
 327  */
 328 static void TASK_CallToStart(void)
 329 {
 330     int exit_code = 1;
 331     TDB *pTask = (TDB *)GlobalLock16( hCurrentTask );
 332     NE_MODULE *pModule = MODULE_GetPtr( pTask->hModule );
 333     SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
 334
 335     SET_CUR_THREAD( pTask->thdb );
 336     /* Terminate the stack frame */
 337     THREAD_STACK16(pTask->thdb)->frame32 = NULL;
 338     if (pModule->flags & NE_FFLAGS_WIN32)
 339     {
 340         /* FIXME: all this is an ugly hack */
 341
 342         FARPROC32 entry = (FARPROC32)RVA_PTR( PROCESS_Current()->exe_modref->module, OptionalHeader.AddressOfEntryPoint );
 343
 344         pTask->userhandler = (USERSIGNALPROC)&USER_SignalProc;
 345         if (pModule->heap_size)
 346             LocalInit( pTask->hInstance, 0, pModule->heap_size );
 347
 348         InitApp( pTask->hModule );
 349         PE_InitializeDLLs( PROCESS_Current(), DLL_PROCESS_ATTACH, (LPVOID)-1 );
 350         TRACE(relay, "(entryproc=%p)\n", entry );
 351         exit_code = entry();
 352         TASK_KillCurrentTask( exit_code );
 353     }
 354     else
 355     {
 356         /* Registers at initialization must be:
 357          * ax   zero
 358          * bx   stack size in bytes
 359          * cx   heap size in bytes
 360          * si   previous app instance
 361          * di   current app instance
 362          * bp   zero
 363          * es   selector to the PSP
 364          * ds   dgroup of the application
 365          * ss   stack selector
 366          * sp   top of the stack
 367          */
 368         CONTEXT context;
 369
 370         memset( &context, 0, sizeof(context) );
 371         CS_reg(&context)  = pSegTable[pModule->cs - 1].selector;
 372         DS_reg(&context)  = pSegTable[pModule->dgroup - 1].selector;
 373         ES_reg(&context)  = pTask->hPDB;
 374         EIP_reg(&context) = pModule->ip;
 375         EBX_reg(&context) = pModule->stack_size;
 376         ECX_reg(&context) = pModule->heap_size;
 377         EDI_reg(&context) = context.SegDs;
 378
 379         TRACE(task, "Starting main program: cs:ip=%04lx:%04x ds=%04lx ss:sp=%04x:%04x\n",
 380                       CS_reg(&context), IP_reg(&context), DS_reg(&context),
 381                       SELECTOROF(pTask->thdb->cur_stack),
 382                       OFFSETOF(pTask->thdb->cur_stack) );
 383
 384         Callbacks->CallRegisterShortProc( &context, 0 );
 385         /* This should never return */
 386         fprintf( stderr, "TASK_CallToStart: Main program returned!\n" );
 387         TASK_KillCurrentTask( 1 );
 388     }
 389 }
 390
 391
 392 /***********************************************************************
 393  *           TASK_CreateTask
 394  */
 395 HTASK16 TASK_CreateTask( HMODULE16 hModule, HINSTANCE16 hInstance,
 396                          HINSTANCE16 hPrevInstance, HANDLE16 hEnvironment,
 397                          LPCSTR cmdLine, UINT16 cmdShow )
 398 {
 399     HTASK16 hTask;
 400     TDB *pTask;
 401     PDB32 *pdb32;
 402     HGLOBAL16 hParentEnv;
 403     NE_MODULE *pModule;
 404     SEGTABLEENTRY *pSegTable;
 405     LPSTR name;
 406     WORD sp;
 407     char *stack32Top;
 408     STACK16FRAME *frame16;
 409     STACK32FRAME *frame32;
 410
 411     if (!(pModule = MODULE_GetPtr( hModule ))) return 0;
 412     pSegTable = NE_SEG_TABLE( pModule );
 413
 414       /* Allocate the task structure */
 415
 416     hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
 417                           hModule, FALSE, FALSE, FALSE );
 418     if (!hTask) return 0;
 419     pTask = (TDB *)GlobalLock16( hTask );
 420
 421       /* Allocate the new environment block */
 422
 423     if (!(hParentEnv = hEnvironment))
 424     {
 425         TDB *pParent = (TDB *)GlobalLock16( hCurrentTask );
 426         hParentEnv = pParent ? pParent->pdb.environment : hDOSEnvironment;
 427     }
 428     /* FIXME: do we really need to make a copy also when */
 429     /*        we don't use the parent environment? */
 430     if (!(hEnvironment = GlobalAlloc16( GMEM_FIXED, GlobalSize16(hParentEnv))))
 431     {
 432         GlobalFree16( hTask );
 433         return 0;
 434     }
 435     memcpy( GlobalLock16( hEnvironment ), GlobalLock16( hParentEnv ),
 436             GlobalSize16( hParentEnv ) );
 437
 438     /* Fill the task structure */
 439
 440     pTask->nEvents       = 1;  /* So the task can be started */
 441     pTask->hSelf         = hTask;
 442     pTask->flags         = 0;
 443
 444     if (pModule->flags & NE_FFLAGS_WIN32)
 445         pTask->flags    |= TDBF_WIN32;
 446
 447     pTask->version       = pModule->expected_version;
 448     pTask->hInstance     = hInstance;
 449     pTask->hPrevInstance = hPrevInstance;
 450     pTask->hModule       = hModule;
 451     pTask->hParent       = hCurrentTask;
 452     pTask->magic         = TDB_MAGIC;
 453     pTask->nCmdShow      = cmdShow;
 454     pTask->curdrive      = DRIVE_GetCurrentDrive() | 0x80;
 455     strcpy( pTask->curdir, "\\" );
 456     lstrcpyn32A( pTask->curdir + 1, DRIVE_GetDosCwd( DRIVE_GetCurrentDrive() ),
 457                  sizeof(pTask->curdir) - 1 );
 458
 459       /* Create the thunks block */
 460
 461     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 462
 463       /* Copy the module name */
 464
 465     name = MODULE_GetModuleName( hModule );
 466     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 467
 468       /* Allocate a selector for the PDB */
 469
 470     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB),
 471                                       hModule, FALSE, FALSE, FALSE, NULL );
 472
 473       /* Fill the PDB */
 474
 475     pTask->pdb.int20 = 0x20cd;
 476     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 477     PUT_DWORD(&pTask->pdb.dispatcher[1], (DWORD)MODULE_GetEntryPoint(
 478            GetModuleHandle16("KERNEL"), 102 ));  /* KERNEL.102 is DOS3Call() */
 479     pTask->pdb.savedint22 = INT_GetHandler( 0x22 );
 480     pTask->pdb.savedint23 = INT_GetHandler( 0x23 );
 481     pTask->pdb.savedint24 = INT_GetHandler( 0x24 );
 482     pTask->pdb.fileHandlesPtr =
 483         PTR_SEG_OFF_TO_SEGPTR( GlobalHandleToSel(pTask->hPDB),
 484                                (int)&((PDB *)0)->fileHandles );
 485     pTask->pdb.hFileHandles = 0;
 486     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 487     pTask->pdb.environment    = hEnvironment;
 488     pTask->pdb.nbFiles        = 20;
 489     lstrcpyn32A( pTask->pdb.cmdLine, cmdLine, sizeof(pTask->pdb.cmdLine) );
 490
 491       /* Get the compatibility flags */
 492
 493     pTask->compat_flags = GetProfileInt32A( "Compatibility", name, 0 );
 494
 495       /* Allocate a code segment alias for the TDB */
 496
 497     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 498                                           sizeof(TDB), pTask->hPDB, TRUE,
 499                                           FALSE, FALSE, NULL );
 500
 501       /* Set the owner of the environment block */
 502
 503     FarSetOwner( pTask->pdb.environment, pTask->hPDB );
 504
 505       /* Default DTA overwrites command-line */
 506
 507     pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB,
 508                                 (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 509
 510     /* Create the Win32 part of the task */
 511
 512     pdb32 = PROCESS_Create( pTask, cmdLine );
 513     /* FIXME: check for pdb32 == NULL.  */
 514     pdb32->task = hTask;
 515     if (pModule->flags & NE_FFLAGS_WIN32)
 516     {
 517     /*
 518         LPTHREAD_START_ROUTINE start =
 519             (LPTHREAD_START_ROUTINE)(
 520                 PROCESS_Current()->exe_modref->load_addr +
 521                 PROCESS_Current()->exe_modref->pe_module->pe_header->OptionalHeader.AddressOfEntryPoint);
 522      */
 523         pTask->thdb = THREAD_Create( pdb32,
 524           PE_HEADER(pModule->module32)->OptionalHeader.SizeOfStackReserve,
 525                                      NULL, NULL );
 526     }
 527     else
 528         pTask->thdb = THREAD_Create( pdb32, 0, NULL, NULL );
 529     /* FIXME: check for pTask->thdb == NULL.  */
 530
 531     /* Create the 16-bit stack frame */
 532
 533     if (!(sp = pModule->sp))
 534         sp = pSegTable[pModule->ss-1].minsize + pModule->stack_size;
 535     sp &= ~1;
 536     pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( hInstance, sp );
 537     pTask->thdb->cur_stack -= sizeof(STACK16FRAME) + sizeof(STACK32FRAME *);
 538     frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
 539     frame16->ebp = sp + (int)&((STACK16FRAME *)0)->bp;
 540     frame16->bp = LOWORD(frame16->ebp);
 541     frame16->ds = frame16->es = pTask->hInstance;
 542     frame16->entry_point = 0;
 543     frame16->entry_cs = 0;
 544     /* The remaining fields will be initialized in TASK_Reschedule */
 545
 546     /* Create the 32-bit stack frame */
 547
 548     stack32Top = (char*)pTask->thdb->teb.stack_top;
 549     frame16->frame32 = frame32 = (STACK32FRAME *)stack32Top - 1;
 550     frame32->frame16 = pTask->thdb->cur_stack + sizeof(STACK16FRAME);
 551     frame32->edi     = 0;
 552     frame32->esi     = 0;
 553     frame32->edx     = 0;
 554     frame32->ecx     = 0;
 555     frame32->ebx     = 0;
 556     frame32->retaddr = (DWORD)TASK_CallToStart;
 557     /* The remaining fields will be initialized in TASK_Reschedule */
 558
 559     if (!THREAD_Current()->cur_stack)
 560         THREAD_Current()->cur_stack = pTask->thdb->cur_stack;
 561
 562     /* Add the task to the linked list */
 563
 564     TASK_LinkTask( hTask );
 565
 566     TRACE(task, "module='%s' cmdline='%s' task=%04x\n",
 567                   name, cmdLine, hTask );
 568
 569     return hTask;
 570 }
 571
 572
 573 /***********************************************************************
 574  *           TASK_DeleteTask
 575  */
 576 static void TASK_DeleteTask( HTASK16 hTask )
 577 {
 578     TDB *pTask;
 579     HGLOBAL16 hPDB;
 580
 581     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 582     hPDB = pTask->hPDB;
 583
 584     pTask->magic = 0xdead; /* invalidate signature */
 585
 586     /* Delete the Win32 part of the task */
 587
 588     K32OBJ_DecCount( &pTask->thdb->process->header );
 589     K32OBJ_DecCount( &pTask->thdb->header );
 590
 591     /* Free the task module */
 592
 593     MODULE_FreeModule( pTask->hModule, pTask );
 594
 595     /* Free the selector aliases */
 596
 597     GLOBAL_FreeBlock( pTask->hCSAlias );
 598     GLOBAL_FreeBlock( pTask->hPDB );
 599
 600     /* Free the task structure itself */
 601
 602     GlobalFree16( hTask );
 603
 604     /* Free all memory used by this task (including the 32-bit stack, */
 605     /* the environment block and the thunk segments). */
 606
 607     GlobalFreeAll( hPDB );
 608 }
 609
 610
 611 /***********************************************************************
 612  *           TASK_KillCurrentTask
 613  *
 614  * Kill the currently running task. As it's not possible to kill the
 615  * current task like this, it is simply marked for destruction, and will
 616  * be killed when either TASK_Reschedule or this function is called again
 617  * in the context of another task.
 618  */
 619 void TASK_KillCurrentTask( INT16 exitCode )
 620 {
 621     TDB* pTask = (TDB*) GlobalLock16( hCurrentTask );
 622     if (!pTask) USER_ExitWindows();  /* No current task yet */
 623
 624     TRACE(task, "Killing task %04x\n", hCurrentTask );
 625
 626     /* Delete active sockets */
 627
 628     if( pTask->pwsi )
 629         WINSOCK_DeleteTaskWSI( pTask, pTask->pwsi );
 630
 631     /* Perform USER cleanup */
 632
 633     if (pTask->userhandler)
 634         pTask->userhandler( hCurrentTask, USIG_TERMINATION, 0,
 635                             pTask->hInstance, pTask->hQueue );
 636
 637     if (hTaskToKill && (hTaskToKill != hCurrentTask))
 638     {
 639         /* If another task is already marked for destruction, */
 640         /* we can kill it now, as we are in another context.  */
 641         TASK_DeleteTask( hTaskToKill );
 642     }
 643
 644     if (nTaskCount <= 1)
 645     {
 646         TRACE(task, "this is the last task, exiting\n" );
 647         USER_ExitWindows();
 648     }
 649
 650     /* Remove the task from the list to be sure we never switch back to it */
 651     TASK_UnlinkTask( hCurrentTask );
 652     if( nTaskCount )
 653     {
 654         TDB* p = (TDB *)GlobalLock16( hFirstTask );
 655         while( p )
 656         {
 657             if( p->hYieldTo == hCurrentTask ) p->hYieldTo = 0;
 658             p = (TDB *)GlobalLock16( p->hNext );
 659         }
 660     }
 661
 662     hTaskToKill = hCurrentTask;
 663     hLockedTask = 0;
 664
 665     pTask->nEvents = 0;
 666     TASK_YieldToSystem(pTask);
 667
 668     /* We should never return from this Yield() */
 669
 670     fprintf(stderr,"Return of the living dead %04x!!!\n", hCurrentTask);
 671     exit(1);
 672 }
 673
 674 /***********************************************************************
 675  *           TASK_Reschedule
 676  *
 677  * This is where all the magic of task-switching happens!
 678  *
 679  * Note: This function should only be called via the TASK_YieldToSystem()
 680  *       wrapper, to make sure that all the context is saved correctly.
 681  *
 682  *       It must not call functions that may yield control.
 683  */
 684 void TASK_Reschedule(void)
 685 {
 686     TDB *pOldTask = NULL, *pNewTask;
 687     HTASK16 hTask = 0;
 688     STACK16FRAME *newframe16;
 689
 690 #ifdef CONFIG_IPC
 691     dde_reschedule();
 692 #endif
 693       /* First check if there's a task to kill */
 694
 695     if (hTaskToKill && (hTaskToKill != hCurrentTask))
 696     {
 697         TASK_DeleteTask( hTaskToKill );
 698         hTaskToKill = 0;
 699     }
 700
 701     /* Find a task to yield to */
 702
 703     pOldTask = (TDB *)GlobalLock16( hCurrentTask );
 704     if (pOldTask && pOldTask->hYieldTo)
 705     {
 706         /* check for DirectedYield() */
 707
 708         hTask = pOldTask->hYieldTo;
 709         pNewTask = (TDB *)GlobalLock16( hTask );
 710         if( !pNewTask || !pNewTask->nEvents) hTask = 0;
 711         pOldTask->hYieldTo = 0;
 712     }
 713
 714     /* extract hardware events only! */
 715
 716     if (!hTask) EVENT_WaitNetEvent( FALSE, TRUE );
 717
 718     while (!hTask)
 719     {
 720         /* Find a task that has an event pending */
 721
 722         hTask = hFirstTask;
 723         while (hTask)
 724         {
 725             pNewTask = (TDB *)GlobalLock16( hTask );
 726
 727             TRACE(task, "\ttask = %04x, events = %i\n", hTask, pNewTask->nEvents);
 728
 729             if (pNewTask->nEvents) break;
 730             hTask = pNewTask->hNext;
 731         }
 732         if (hLockedTask && (hTask != hLockedTask)) hTask = 0;
 733         if (hTask) break;
 734
 735         /* No task found, wait for some events to come in */
 736
 737         EVENT_WaitNetEvent( TRUE, TRUE );
 738     }
 739
 740     if (hTask == hCurrentTask)
 741     {
 742        TRACE(task, "returning to the current task(%04x)\n", hTask );
 743        return;  /* Nothing to do */
 744     }
 745     pNewTask = (TDB *)GlobalLock16( hTask );
 746     TRACE(task, "Switching to task %04x (%.8s)\n",
 747                   hTask, pNewTask->module_name );
 748
 749      /* Make the task the last in the linked list (round-robin scheduling) */
 750
 751     pNewTask->priority++;
 752     TASK_UnlinkTask( hTask );
 753     TASK_LinkTask( hTask );
 754     pNewTask->priority--;
 755
 756     /* Finish initializing the new task stack if necessary */
 757
 758     newframe16 = THREAD_STACK16( pNewTask->thdb );
 759     if (!newframe16->entry_cs)
 760     {
 761         STACK16FRAME *oldframe16 = CURRENT_STACK16;
 762         STACK32FRAME *oldframe32 = oldframe16->frame32;
 763         STACK32FRAME *newframe32 = newframe16->frame32;
 764         newframe16->entry_ip     = oldframe16->entry_ip;
 765         newframe16->entry_cs     = oldframe16->entry_cs;
 766         newframe16->ip           = oldframe16->ip;
 767         newframe16->cs           = oldframe16->cs;
 768         newframe32->ebp          = oldframe32->ebp;
 769         newframe32->restore_addr = oldframe32->restore_addr;
 770         newframe32->codeselector = oldframe32->codeselector;
 771     }
 772
 773     /* Switch to the new stack */
 774
 775     hCurrentTask = hTask;
 776     SET_CUR_THREAD( pNewTask->thdb );
 777     pNewTask->ss_sp = pNewTask->thdb->cur_stack;
 778 }
 779
 780
 781 /***********************************************************************
 782  *           TASK_YieldToSystem
 783  *
 784  * Scheduler interface, this way we ensure that all "unsafe" events are
 785  * processed outside the scheduler.
 786  */
 787 void TASK_YieldToSystem(TDB* pTask)
 788 {
 789   MESSAGEQUEUE*         pQ;
 790
 791   Callbacks->CallTaskRescheduleProc();
 792
 793   if( pTask )
 794   {
 795     pQ = (MESSAGEQUEUE*)GlobalLock16(pTask->hQueue);
 796     if( pQ && pQ->flags & QUEUE_FLAG_XEVENT &&
 797             !(pQ->wakeBits & (QS_SENDMESSAGE | QS_SMRESULT)) )
 798     {
 799       pQ->flags &= ~QUEUE_FLAG_XEVENT;
 800       EVENT_WaitNetEvent( FALSE, FALSE );
 801     }
 802   }
 803 }
 804
 805
 806 /***********************************************************************
 807  *           InitTask  (KERNEL.91)
 808  *
 809  * Called by the application startup code.
 810  */
 811 void WINAPI InitTask( CONTEXT *context )
 812 {
 813     TDB *pTask;
 814     NE_MODULE *pModule;
 815     SEGTABLEENTRY *pSegTable;
 816     INSTANCEDATA *pinstance;
 817     LONG stacklow, stackhi;
 818
 819     if (context) EAX_reg(context) = 0;
 820     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
 821     if (!(pModule = MODULE_GetPtr( pTask->hModule ))) return;
 822
 823     /* This is a hack to install task USER signal handler before
 824      * implicitly loaded DLLs are initialized (see windows/user.c) */
 825
 826     pTask->userhandler = (USERSIGNALPROC)&USER_SignalProc;
 827
 828     /* Initialize implicitly loaded DLLs */
 829     NE_InitializeDLLs( pTask->hModule );
 830
 831     if (context)
 832     {
 833         /* Registers on return are:
 834          * ax     1 if OK, 0 on error
 835          * cx     stack limit in bytes
 836          * dx     cmdShow parameter
 837          * si     instance handle of the previous instance
 838          * di     instance handle of the new task
 839          * es:bx  pointer to command-line inside PSP
 840          */
 841         EAX_reg(context) = 1;
 842         EBX_reg(context) = pTask->pdb.cmdLine[0] ? 0x81 : 0x80;
 843         ECX_reg(context) = pModule->stack_size;
 844         EDX_reg(context) = pTask->nCmdShow;
 845         ESI_reg(context) = (DWORD)pTask->hPrevInstance;
 846         EDI_reg(context) = (DWORD)pTask->hInstance;
 847         ES_reg (context) = (WORD)pTask->hPDB;
 848     }
 849
 850     /* Initialize the local heap */
 851     if ( pModule->heap_size )
 852     {
 853         LocalInit( pTask->hInstance, 0, pModule->heap_size );
 854     }
 855
 856     /* Initialize the INSTANCEDATA structure */
 857     pSegTable = NE_SEG_TABLE( pModule );
 858     stacklow = pSegTable[pModule->ss - 1].minsize;
 859     stackhi  = stacklow + pModule->stack_size;
 860     if (stackhi > 0xffff) stackhi = 0xffff;
 861     pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
 862     pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */
 863     pinstance->stacktop    = stacklow;
 864     pinstance->stackmin    = OFFSETOF( pTask->thdb->cur_stack );
 865 }
 866
 867
 868 /***********************************************************************
 869  *           WaitEvent  (KERNEL.30)
 870  */
 871 BOOL16 WINAPI WaitEvent( HTASK16 hTask )
 872 {
 873     TDB *pTask;
 874
 875     if (!hTask) hTask = hCurrentTask;
 876     pTask = (TDB *)GlobalLock16( hTask );
 877     if (pTask->nEvents > 0)
 878     {
 879         pTask->nEvents--;
 880         return FALSE;
 881     }
 882     TASK_YieldToSystem(pTask);
 883
 884     /* When we get back here, we have an event */
 885
 886     if (pTask->nEvents > 0) pTask->nEvents--;
 887     return TRUE;
 888 }
 889
 890
 891 /***********************************************************************
 892  *           PostEvent  (KERNEL.31)
 893  */
 894 void WINAPI PostEvent( HTASK16 hTask )
 895 {
 896     TDB *pTask;
 897
 898     if (!hTask) hTask = hCurrentTask;
 899     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 900     pTask->nEvents++;
 901 }
 902
 903
 904 /***********************************************************************
 905  *           SetPriority  (KERNEL.32)
 906  */
 907 void WINAPI SetPriority( HTASK16 hTask, INT16 delta )
 908 {
 909     TDB *pTask;
 910     INT16 newpriority;
 911
 912     if (!hTask) hTask = hCurrentTask;
 913     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 914     newpriority = pTask->priority + delta;
 915     if (newpriority < -32) newpriority = -32;
 916     else if (newpriority > 15) newpriority = 15;
 917
 918     pTask->priority = newpriority + 1;
 919     TASK_UnlinkTask( hTask );
 920     TASK_LinkTask( hTask );
 921     pTask->priority--;
 922 }
 923
 924
 925 /***********************************************************************
 926  *           LockCurrentTask  (KERNEL.33)
 927  */
 928 HTASK16 WINAPI LockCurrentTask( BOOL16 bLock )
 929 {
 930     if (bLock) hLockedTask = hCurrentTask;
 931     else hLockedTask = 0;
 932     return hLockedTask;
 933 }
 934
 935
 936 /***********************************************************************
 937  *           IsTaskLocked  (KERNEL.122)
 938  */
 939 HTASK16 WINAPI IsTaskLocked(void)
 940 {
 941     return hLockedTask;
 942 }
 943
 944
 945 /***********************************************************************
 946  *           OldYield  (KERNEL.117)
 947  */
 948 void WINAPI OldYield(void)
 949 {
 950     TDB *pCurTask;
 951
 952     pCurTask = (TDB *)GlobalLock16( hCurrentTask );
 953     if (pCurTask) pCurTask->nEvents++;  /* Make sure we get back here */
 954     TASK_YieldToSystem(pCurTask);
 955     if (pCurTask) pCurTask->nEvents--;
 956 }
 957
 958
 959 /***********************************************************************
 960  *           DirectedYield  (KERNEL.150)
 961  */
 962 void WINAPI DirectedYield( HTASK16 hTask )
 963 {
 964     TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
 965     pCurTask->hYieldTo = hTask;
 966     OldYield();
 967 }
 968
 969
 970 /***********************************************************************
 971  *           UserYield  (USER.332)
 972  */
 973 void WINAPI UserYield(void)
 974 {
 975     TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
 976     MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
 977     /* Handle sent messages */
 978     while (queue && (queue->wakeBits & QS_SENDMESSAGE))
 979         QUEUE_ReceiveMessage( queue );
 980
 981     OldYield();
 982
 983     queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
 984     while (queue && (queue->wakeBits & QS_SENDMESSAGE))
 985         QUEUE_ReceiveMessage( queue );
 986 }
 987
 988
 989 /***********************************************************************
 990  *           Yield16  (KERNEL.29)
 991  */
 992 void WINAPI Yield16(void)
 993 {
 994     TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
 995     if (pCurTask) pCurTask->hYieldTo = 0;
 996     if (pCurTask && pCurTask->hQueue) UserYield();
 997     else OldYield();
 998 }
 999
1000
1001 /***********************************************************************
1002  *           MakeProcInstance16  (KERNEL.51)
1003  */
1004 FARPROC16 WINAPI MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
1005 {
1006     BYTE *thunk,*lfunc;
1007     SEGPTR thunkaddr;
1008
1009     if (!hInstance) return 0;
1010     if (__winelib) return func; /* func can be called directly in Winelib */
1011     thunkaddr = TASK_AllocThunk( hCurrentTask );
1012     if (!thunkaddr) return (FARPROC16)0;
1013     thunk = PTR_SEG_TO_LIN( thunkaddr );
1014     lfunc = PTR_SEG_TO_LIN( func );
1015
1016     TRACE(task, "(%08lx,%04x): got thunk %08lx\n",
1017                   (DWORD)func, hInstance, (DWORD)thunkaddr );
1018     if (((lfunc[0]==0x8c) && (lfunc[1]==0xd8)) ||
1019         ((lfunc[0]==0x1e) && (lfunc[1]==0x58))
1020     ) {
1021         fprintf(stderr,"FIXME: MakeProcInstance16 thunk would be useless for %p, overwriting with nop;nop;\n", func );
1022         lfunc[0]=0x90; /* nop */
1023         lfunc[1]=0x90; /* nop */
1024     }
1025
1026     *thunk++ = 0xb8;    /* movw instance, %ax */
1027     *thunk++ = (BYTE)(hInstance & 0xff);
1028     *thunk++ = (BYTE)(hInstance >> 8);
1029     *thunk++ = 0xea;    /* ljmp func */
1030     *(DWORD *)thunk = (DWORD)func;
1031     return (FARPROC16)thunkaddr;
1032 }
1033
1034
1035 /***********************************************************************
1036  *           FreeProcInstance16  (KERNEL.52)
1037  */
1038 void WINAPI FreeProcInstance16( FARPROC16 func )
1039 {
1040     TRACE(task, "(%08lx)\n", (DWORD)func );
1041     if (!__winelib) TASK_FreeThunk( hCurrentTask, (SEGPTR)func );
1042 }
1043
1044
1045 /**********************************************************************
1046  *          GetCodeHandle    (KERNEL.93)
1047  */
1048 HANDLE16 WINAPI GetCodeHandle( FARPROC16 proc )
1049 {
1050     HANDLE16 handle;
1051     BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
1052
1053     if (__winelib) return 0;
1054
1055     /* Return the code segment containing 'proc'. */
1056     /* Not sure if this is really correct (shouldn't matter that much). */
1057
1058     /* Check if it is really a thunk */
1059     if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
1060         handle = GlobalHandle16( thunk[6] + (thunk[7] << 8) );
1061     else
1062         handle = GlobalHandle16( HIWORD(proc) );
1063
1064     return handle;
1065 }
1066
1067
1068 /**********************************************************************
1069  *          DefineHandleTable16    (KERNEL.94)
1070  */
1071 BOOL16 WINAPI DefineHandleTable16( WORD wOffset )
1072 {
1073     return TRUE;  /* FIXME */
1074 }
1075
1076
1077 /***********************************************************************
1078  *           SetTaskQueue  (KERNEL.34)
1079  */
1080 HQUEUE16 WINAPI SetTaskQueue( HTASK16 hTask, HQUEUE16 hQueue )
1081 {
1082     HQUEUE16 hPrev;
1083     TDB *pTask;
1084
1085     if (!hTask) hTask = hCurrentTask;
1086     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1087
1088     hPrev = pTask->hQueue;
1089     pTask->hQueue = hQueue;
1090
1091     TIMER_SwitchQueue( hPrev, hQueue );
1092
1093     return hPrev;
1094 }
1095
1096
1097 /***********************************************************************
1098  *           GetTaskQueue  (KERNEL.35)
1099  */
1100 HQUEUE16 WINAPI GetTaskQueue( HTASK16 hTask )
1101 {
1102     TDB *pTask;
1103
1104     if (!hTask) hTask = hCurrentTask;
1105     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1106     return pTask->hQueue;
1107 }
1108
1109
1110 /***********************************************************************
1111  *           SwitchStackTo   (KERNEL.108)
1112  */
1113 void WINAPI SwitchStackTo( WORD seg, WORD ptr, WORD top )
1114 {
1115     TDB *pTask;
1116     STACK16FRAME *oldFrame, *newFrame;
1117     INSTANCEDATA *pData;
1118     UINT16 copySize;
1119
1120     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
1121     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1122     TRACE(task, "old=%04x:%04x new=%04x:%04x\n",
1123                   SELECTOROF( pTask->thdb->cur_stack ),
1124                   OFFSETOF( pTask->thdb->cur_stack ), seg, ptr );
1125
1126     /* Save the old stack */
1127
1128     pData->old_ss_sp   = pTask->thdb->cur_stack;
1129     pData->stacktop    = top;
1130     pData->stackmin    = ptr;
1131     pData->stackbottom = ptr;
1132
1133     /* Switch to the new stack */
1134
1135     /* Note: we need to take the 3 arguments into account; otherwise,
1136      * the stack will underflow upon return from this function.
1137      */
1138     oldFrame = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
1139     pTask->thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR( seg,
1140                              ptr - sizeof(STACK16FRAME) - 3 * sizeof(WORD) );
1141     newFrame = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
1142
1143     /* Copy the stack frame and the local variables to the new stack */
1144
1145     copySize = oldFrame->bp - OFFSETOF(pData->old_ss_sp);
1146     memmove( newFrame, oldFrame, MAX( copySize, sizeof(STACK16FRAME) ));
1147 }
1148
1149
1150 /***********************************************************************
1151  *           SwitchStackBack   (KERNEL.109)
1152  *
1153  * Note: the function is declared as 'register' in the spec file in order
1154  * to make sure all registers are preserved, but we don't use them in any
1155  * way, so we don't need a CONTEXT* argument.
1156  */
1157 void WINAPI SwitchStackBack(void)
1158 {
1159     TDB *pTask;
1160     STACK16FRAME *oldFrame, *newFrame;
1161     INSTANCEDATA *pData;
1162
1163     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
1164     if (!(pData = (INSTANCEDATA *)GlobalLock16(SELECTOROF(pTask->thdb->cur_stack))))
1165         return;
1166     if (!pData->old_ss_sp)
1167     {
1168         fprintf( stderr, "SwitchStackBack: no previous SwitchStackTo\n" );
1169         return;
1170     }
1171     TRACE(task, "restoring stack %04x:%04x\n",
1172                  SELECTOROF(pData->old_ss_sp), OFFSETOF(pData->old_ss_sp) );
1173
1174     oldFrame = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
1175
1176     /* Switch back to the old stack */
1177
1178     pTask->thdb->cur_stack = pData->old_ss_sp;
1179     pData->old_ss_sp = 0;
1180
1181     /* Build a stack frame for the return */
1182
1183     newFrame = (STACK16FRAME *)PTR_SEG_TO_LIN( pTask->thdb->cur_stack );
1184     newFrame->frame32 = oldFrame->frame32;
1185     if (TRACE_ON(relay))
1186     {
1187         newFrame->entry_ip = oldFrame->entry_ip;
1188         newFrame->entry_cs = oldFrame->entry_cs;
1189     }
1190 }
1191
1192
1193 /***********************************************************************
1194  *           GetTaskQueueDS  (KERNEL.118)
1195  */
1196 void WINAPI GetTaskQueueDS( CONTEXT *context )
1197 {
1198     DS_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1199 }
1200
1201
1202 /***********************************************************************
1203  *           GetTaskQueueES  (KERNEL.119)
1204  */
1205 void WINAPI GetTaskQueueES( CONTEXT *context )
1206 {
1207     ES_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1208 }
1209
1210
1211 /***********************************************************************
1212  *           GetCurrentTask   (KERNEL.36)
1213  */
1214 HTASK16 WINAPI GetCurrentTask(void)
1215 {
1216     return hCurrentTask;
1217 }
1218
1219 DWORD WINAPI WIN16_GetCurrentTask(void)
1220 {
1221     /* This is the version used by relay code; the first task is */
1222     /* returned in the high word of the result */
1223     return MAKELONG( hCurrentTask, hFirstTask );
1224 }
1225
1226
1227 /***********************************************************************
1228  *           GetCurrentPDB   (KERNEL.37)
1229  */
1230 HANDLE16 WINAPI GetCurrentPDB(void)
1231 {
1232     TDB *pTask;
1233
1234     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1235     return pTask->hPDB;
1236 }
1237
1238
1239 /***********************************************************************
1240  *           GetInstanceData   (KERNEL.54)
1241  */
1242 INT16 WINAPI GetInstanceData( HINSTANCE16 instance, WORD buffer, INT16 len )
1243 {
1244     char *ptr = (char *)GlobalLock16( instance );
1245     if (!ptr || !len) return 0;
1246     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1247     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1248     return len;
1249 }
1250
1251
1252 /***********************************************************************
1253  *           GetExeVersion   (KERNEL.105)
1254  */
1255 WORD WINAPI GetExeVersion(void)
1256 {
1257     TDB *pTask;
1258
1259     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1260     return pTask->version;
1261 }
1262
1263
1264 /***********************************************************************
1265  *           SetErrorMode16   (KERNEL.107)
1266  */
1267 UINT16 WINAPI SetErrorMode16( UINT16 mode )
1268 {
1269     TDB *pTask;
1270     UINT16 oldMode;
1271
1272     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1273     oldMode = pTask->error_mode;
1274     pTask->error_mode = mode;
1275     pTask->thdb->process->error_mode = mode;
1276     return oldMode;
1277 }
1278
1279
1280 /***********************************************************************
1281  *           SetErrorMode32   (KERNEL32.486)
1282  */
1283 UINT32 WINAPI SetErrorMode32( UINT32 mode )
1284 {
1285     return SetErrorMode16( (UINT16)mode );
1286 }
1287
1288
1289 /***********************************************************************
1290  *           GetDOSEnvironment   (KERNEL.131)
1291  */
1292 SEGPTR WINAPI GetDOSEnvironment(void)
1293 {
1294     TDB *pTask;
1295
1296     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1297     return (SEGPTR)WIN16_GlobalLock16( pTask->pdb.environment );
1298 }
1299
1300
1301 /***********************************************************************
1302  *           GetNumTasks   (KERNEL.152)
1303  */
1304 UINT16 WINAPI GetNumTasks(void)
1305 {
1306     return nTaskCount;
1307 }
1308
1309
1310 /***********************************************************************
1311  *           GetTaskDS   (KERNEL.155)
1312  *
1313  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1314  * I don't think we need to bother with this.
1315  */
1316 HINSTANCE16 WINAPI GetTaskDS(void)
1317 {
1318     TDB *pTask;
1319
1320     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1321     return pTask->hInstance;
1322 }
1323
1324
1325 /***********************************************************************
1326  *           IsTask   (KERNEL.320)
1327  */
1328 BOOL16 WINAPI IsTask( HTASK16 hTask )
1329 {
1330     TDB *pTask;
1331
1332     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
1333     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1334     return (pTask->magic == TDB_MAGIC);
1335 }
1336
1337
1338 /***********************************************************************
1339  *           SetTaskSignalProc   (KERNEL.38)
1340  *
1341  * Real 16-bit interface is provided by the THUNK_SetTaskSignalProc.
1342  */
1343 FARPROC16 WINAPI SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1344 {
1345     TDB *pTask;
1346     FARPROC16 oldProc;
1347
1348     if (!hTask) hTask = hCurrentTask;
1349     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
1350     oldProc = (FARPROC16)pTask->userhandler;
1351     pTask->userhandler = (USERSIGNALPROC)proc;
1352     return oldProc;
1353 }
1354
1355
1356 /***********************************************************************
1357  *           SetSigHandler   (KERNEL.140)
1358  */
1359 WORD WINAPI SetSigHandler( FARPROC16 newhandler, FARPROC16* oldhandler,
1360                            UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1361 {
1362     FIXME(task,"(%p,%p,%p,%d,%d), unimplemented.\n",
1363           newhandler,oldhandler,oldmode,newmode,flag );
1364
1365     if (flag != 1) return 0;
1366     if (!newmode) newhandler = NULL;  /* Default handler */
1367     if (newmode != 4)
1368     {
1369         TDB *pTask;
1370
1371         if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1372         if (oldmode) *oldmode = pTask->signal_flags;
1373         pTask->signal_flags = newmode;
1374         if (oldhandler) *oldhandler = pTask->sighandler;
1375         pTask->sighandler = newhandler;
1376     }
1377     return 0;
1378 }
1379
1380
1381 /***********************************************************************
1382  *           GlobalNotify   (KERNEL.154)
1383  */
1384 VOID WINAPI GlobalNotify( FARPROC16 proc )
1385 {
1386     TDB *pTask;
1387
1388     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
1389     pTask->discardhandler = proc;
1390 }
1391
1392
1393 /***********************************************************************
1394  *           GetExePtr   (KERNEL.133)
1395  */
1396 HMODULE16 WINAPI GetExePtr( HANDLE16 handle )
1397 {
1398     char *ptr;
1399     HTASK16 hTask;
1400     HANDLE16 owner;
1401
1402       /* Check for module handle */
1403
1404     if (!(ptr = GlobalLock16( handle ))) return 0;
1405     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return handle;
1406
1407       /* Check the owner for module handle */
1408
1409     owner = FarGetOwner( handle );
1410     if (!(ptr = GlobalLock16( owner ))) return 0;
1411     if (((NE_MODULE *)ptr)->magic == IMAGE_OS2_SIGNATURE) return owner;
1412
1413       /* Search for this handle and its owner inside all tasks */
1414
1415     hTask = hFirstTask;
1416     while (hTask)
1417     {
1418         TDB *pTask = (TDB *)GlobalLock16( hTask );
1419         if ((hTask == handle) ||
1420             (pTask->hInstance == handle) ||
1421             (pTask->hQueue == handle) ||
1422             (pTask->hPDB == handle)) return pTask->hModule;
1423         if ((hTask == owner) ||
1424             (pTask->hInstance == owner) ||
1425             (pTask->hQueue == owner) ||
1426             (pTask->hPDB == owner)) return pTask->hModule;
1427         hTask = pTask->hNext;
1428     }
1429     return 0;
1430 }
1431
1432 /***********************************************************************
1433  *           TaskFirst   (TOOLHELP.63)
1434  */
1435 BOOL16 WINAPI TaskFirst( TASKENTRY *lpte )
1436 {
1437     lpte->hNext = hFirstTask;
1438     return TaskNext( lpte );
1439 }
1440
1441
1442 /***********************************************************************
1443  *           TaskNext   (TOOLHELP.64)
1444  */
1445 BOOL16 WINAPI TaskNext( TASKENTRY *lpte )
1446 {
1447     TDB *pTask;
1448     INSTANCEDATA *pInstData;
1449
1450     TRACE(toolhelp, "(%p): task=%04x\n", lpte, lpte->hNext );
1451     if (!lpte->hNext) return FALSE;
1452     pTask = (TDB *)GlobalLock16( lpte->hNext );
1453     if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1454     pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 );
1455     lpte->hTask         = lpte->hNext;
1456     lpte->hTaskParent   = pTask->hParent;
1457     lpte->hInst         = pTask->hInstance;
1458     lpte->hModule       = pTask->hModule;
1459     lpte->wSS           = SELECTOROF( pTask->thdb->cur_stack );
1460     lpte->wSP           = OFFSETOF( pTask->thdb->cur_stack );
1461     lpte->wStackTop     = pInstData->stacktop;
1462     lpte->wStackMinimum = pInstData->stackmin;
1463     lpte->wStackBottom  = pInstData->stackbottom;
1464     lpte->wcEvents      = pTask->nEvents;
1465     lpte->hQueue        = pTask->hQueue;
1466     strncpy( lpte->szModule, pTask->module_name, 8 );
1467     lpte->szModule[8]   = '\0';
1468     lpte->wPSPOffset    = 0x100;  /*??*/
1469     lpte->hNext         = pTask->hNext;
1470     return TRUE;
1471 }
1472
1473
1474 /***********************************************************************
1475  *           TaskFindHandle   (TOOLHELP.65)
1476  */
1477 BOOL16 WINAPI TaskFindHandle( TASKENTRY *lpte, HTASK16 hTask )
1478 {
1479     lpte->hNext = hTask;
1480     return TaskNext( lpte );
1481 }
1482
1483
1484 /***********************************************************************
1485  *           GetAppCompatFlags16   (KERNEL.354)
1486  */
1487 DWORD WINAPI GetAppCompatFlags16( HTASK16 hTask )
1488 {
1489     return GetAppCompatFlags32( hTask );
1490 }
1491
1492
1493 /***********************************************************************
1494  *           GetAppCompatFlags32   (USER32.205)
1495  */
1496 DWORD WINAPI GetAppCompatFlags32( HTASK32 hTask )
1497 {
1498     TDB *pTask;
1499
1500     if (!hTask) hTask = GetCurrentTask();
1501     if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0;
1502     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1503     return pTask->compat_flags;
1504 }