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 "task.h"
  13 #include "callback.h"
  14 #include "directory.h"
  15 #include "dos_fs.h"
  16 #include "file.h"
  17 #include "debugger.h"
  18 #include "global.h"
  19 #include "instance.h"
  20 #include "message.h"
  21 #include "miscemu.h"
  22 #include "module.h"
  23 #include "neexe.h"
  24 #include "options.h"
  25 #include "peexe.h"
  26 #include "pe_image.h"
  27 #include "queue.h"
  28 #include "stackframe.h"
  29 #include "toolhelp.h"
  30 #include "stddebug.h"
  31 #include "debug.h"
  32 #include "dde_proc.h"
  33
  34   /* Min. number of thunks allocated when creating a new segment */
  35 #define MIN_THUNKS  32
  36
  37   /* 32-bit stack size for each task */
  38   /* Must not be greater than 64k, or MAKE_SEGPTR won't work */
  39 #define STACK32_SIZE 0x10000
  40
  41 extern void USER_AppExit( HTASK16, HINSTANCE16, HQUEUE16 );
  42
  43   /* Saved 16-bit stack for current process (Win16 only) */
  44 WORD IF1632_Saved16_ss = 0;
  45 WORD IF1632_Saved16_sp = 0;
  46
  47   /* Saved 32-bit stack for current process (Win16 only) */
  48 DWORD IF1632_Saved32_esp = 0;
  49 SEGPTR IF1632_Stack32_base = 0;
  50
  51   /* Original Unix stack */
  52 DWORD IF1632_Original32_esp;
  53
  54 static HTASK16 hFirstTask = 0;
  55 static HTASK16 hCurrentTask = 0;
  56 static HTASK16 hTaskToKill = 0;
  57 static HTASK16 hLockedTask = 0;
  58 static WORD nTaskCount = 0;
  59 static HANDLE hDOSEnvironment = 0;
  60
  61   /* TASK_Reschedule() 16-bit entry point */
  62 static FARPROC16 TASK_RescheduleProc;
  63
  64 #ifdef WINELIB
  65 #define TASK_SCHEDULE()  TASK_Reschedule()
  66 #else
  67 #define TASK_SCHEDULE()  CallTo16_word_(TASK_RescheduleProc)
  68 #endif
  69
  70 static HANDLE TASK_CreateDOSEnvironment(void);
  71
  72 /***********************************************************************
  73  *           TASK_Init
  74  */
  75 BOOL32 TASK_Init(void)
  76 {
  77     TASK_RescheduleProc = MODULE_GetWndProcEntry16( "TASK_Reschedule" );
  78     if (!(hDOSEnvironment = TASK_CreateDOSEnvironment()))
  79         fprintf( stderr, "Not enough memory for DOS Environment\n" );
  80     return (hDOSEnvironment != 0);
  81 }
  82
  83
  84 /***********************************************************************
  85  *           TASK_GetNextTask
  86  */
  87 HTASK TASK_GetNextTask( HTASK hTask )
  88 {
  89     TDB* pTask = (TDB*)GlobalLock16(hTask);
  90
  91     if (pTask->hNext) return pTask->hNext;
  92     return (hFirstTask != hTask) ? hFirstTask : 0;
  93 }
  94
  95
  96 /***********************************************************************
  97  *           TASK_CreateDOSEnvironment
  98  *
  99  * Create the original DOS environment.
 100  */
 101 static HANDLE TASK_CreateDOSEnvironment(void)
 102 {
 103     static const char program_name[] = "KRNL386.EXE";
 104     char **e, *p;
 105     int initial_size, size, i, winpathlen, sysdirlen;
 106     HANDLE handle;
 107
 108     extern char **environ;
 109
 110     /* DOS environment format:
 111      * ASCIIZ   string 1
 112      * ASCIIZ   string 2
 113      * ...
 114      * ASCIIZ   string n
 115      * ASCIIZ   PATH=xxx
 116      * BYTE     0
 117      * WORD     1
 118      * ASCIIZ   program name (e.g. C:\WINDOWS\SYSTEM\KRNL386.EXE)
 119      */
 120
 121     /* First compute the size of the fixed part of the environment */
 122
 123     for (i = winpathlen = 0; ; i++)
 124     {
 125         int len = DIR_GetDosPath( i, NULL, 0 );
 126         if (!len) break;
 127         winpathlen += len + 1;
 128     }
 129     if (!winpathlen) winpathlen = 1;
 130     sysdirlen  = GetSystemDirectory32A( NULL, 0 ) + 1;
 131     initial_size = 5 + winpathlen +           /* PATH=xxxx */
 132                    1 +                        /* BYTE 0 at end */
 133                    sizeof(WORD) +             /* WORD 1 */
 134                    sysdirlen +                /* program directory */
 135                    strlen(program_name) + 1;  /* program name */
 136
 137     /* Compute the total size of the Unix environment (except path) */
 138
 139     for (e = environ, size = initial_size; *e; e++)
 140     {
 141         if (lstrncmpi32A(*e, "path=", 5))
 142         {
 143             int len = strlen(*e) + 1;
 144             if (size + len >= 32767)
 145             {
 146                 fprintf( stderr, "Warning: environment larger than 32k.\n" );
 147                 break;
 148             }
 149             size += len;
 150         }
 151     }
 152
 153
 154     /* Now allocate the environment */
 155
 156     if (!(handle = GlobalAlloc16( GMEM_FIXED, size ))) return 0;
 157     p = (char *)GlobalLock16( handle );
 158
 159     /* And fill it with the Unix environment */
 160
 161     for (e = environ, size = initial_size; *e; e++)
 162     {
 163         if (lstrncmpi32A(*e, "path=", 5))
 164         {
 165             int len = strlen(*e) + 1;
 166             if (size + len >= 32767) break;
 167             strcpy( p, *e );
 168             size += len;
 169             p    += len;
 170         }
 171     }
 172
 173     /* Now add the path */
 174
 175     strcpy( p, "PATH=" );
 176     for (i = 0, p += 5; ; i++)
 177     {
 178         if (!DIR_GetDosPath( i, p, winpathlen )) break;
 179         p += strlen(p);
 180         *p++ = ';';
 181     }
 182     if (p[-1] == ';') p[-1] = '\0';
 183     else p++;
 184
 185     /* Now add the program name */
 186
 187     *p++ = '\0';
 188     PUT_WORD( p, 1 );
 189     p += sizeof(WORD);
 190     GetSystemDirectory32A( p, sysdirlen );
 191     strcat( p, "\\" );
 192     strcat( p, program_name );
 193
 194     /* Display it */
 195
 196     p = (char *) GlobalLock16( handle );
 197     dprintf_task(stddeb, "Master DOS environment at %p\n", p);
 198     for (; *p; p += strlen(p) + 1) dprintf_task(stddeb, "    %s\n", p);
 199     dprintf_task( stddeb, "Progname: %s\n", p+3 );
 200
 201     return handle;
 202 }
 203
 204
 205 /***********************************************************************
 206  *           TASK_LinkTask
 207  */
 208 static void TASK_LinkTask( HTASK16 hTask )
 209 {
 210     HTASK16 *prevTask;
 211     TDB *pTask;
 212
 213     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 214     prevTask = &hFirstTask;
 215     while (*prevTask)
 216     {
 217         TDB *prevTaskPtr = (TDB *)GlobalLock16( *prevTask );
 218         if (prevTaskPtr->priority >= pTask->priority) break;
 219         prevTask = &prevTaskPtr->hNext;
 220     }
 221     pTask->hNext = *prevTask;
 222     *prevTask = hTask;
 223     nTaskCount++;
 224 }
 225
 226
 227 /***********************************************************************
 228  *           TASK_UnlinkTask
 229  */
 230 static void TASK_UnlinkTask( HTASK16 hTask )
 231 {
 232     HTASK16 *prevTask;
 233     TDB *pTask;
 234
 235     prevTask = &hFirstTask;
 236     while (*prevTask && (*prevTask != hTask))
 237     {
 238         pTask = (TDB *)GlobalLock16( *prevTask );
 239         prevTask = &pTask->hNext;
 240     }
 241     if (*prevTask)
 242     {
 243         pTask = (TDB *)GlobalLock16( *prevTask );
 244         *prevTask = pTask->hNext;
 245         pTask->hNext = 0;
 246         nTaskCount--;
 247     }
 248 }
 249
 250
 251 /***********************************************************************
 252  *           TASK_CreateThunks
 253  *
 254  * Create a thunk free-list in segment 'handle', starting from offset 'offset'
 255  * and containing 'count' entries.
 256  */
 257 static void TASK_CreateThunks( HGLOBAL16 handle, WORD offset, WORD count )
 258 {
 259     int i;
 260     WORD free;
 261     THUNKS *pThunk;
 262
 263     pThunk = (THUNKS *)((BYTE *)GlobalLock16( handle ) + offset);
 264     pThunk->next = 0;
 265     pThunk->magic = THUNK_MAGIC;
 266     pThunk->free = (int)&pThunk->thunks - (int)pThunk;
 267     free = pThunk->free;
 268     for (i = 0; i < count-1; i++)
 269     {
 270         free += 8;  /* Offset of next thunk */
 271         pThunk->thunks[4*i] = free;
 272     }
 273     pThunk->thunks[4*i] = 0;  /* Last thunk */
 274 }
 275
 276
 277 /***********************************************************************
 278  *           TASK_AllocThunk
 279  *
 280  * Allocate a thunk for MakeProcInstance().
 281  */
 282 #ifndef WINELIB32
 283 static SEGPTR TASK_AllocThunk( HTASK hTask )
 284 {
 285     TDB *pTask;
 286     THUNKS *pThunk;
 287     WORD sel, base;
 288
 289     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
 290     sel = pTask->hCSAlias;
 291     pThunk = &pTask->thunks;
 292     base = (int)pThunk - (int)pTask;
 293     while (!pThunk->free)
 294     {
 295         sel = pThunk->next;
 296         if (!sel)  /* Allocate a new segment */
 297         {
 298             sel = GLOBAL_Alloc( GMEM_FIXED, sizeof(THUNKS) + (MIN_THUNKS-1)*8,
 299                                 pTask->hPDB, TRUE, FALSE, FALSE );
 300             if (!sel) return (SEGPTR)0;
 301             TASK_CreateThunks( sel, 0, MIN_THUNKS );
 302             pThunk->next = sel;
 303         }
 304         pThunk = (THUNKS *)GlobalLock16( sel );
 305         base = 0;
 306     }
 307     base += pThunk->free;
 308     pThunk->free = *(WORD *)((BYTE *)pThunk + pThunk->free);
 309     return PTR_SEG_OFF_TO_SEGPTR( sel, base );
 310 }
 311 #endif
 312
 313
 314 /***********************************************************************
 315  *           TASK_FreeThunk
 316  *
 317  * Free a MakeProcInstance() thunk.
 318  */
 319 #ifndef WINELIB32
 320 static BOOL TASK_FreeThunk( HTASK hTask, SEGPTR thunk )
 321 {
 322     TDB *pTask;
 323     THUNKS *pThunk;
 324     WORD sel, base;
 325
 326     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
 327     sel = pTask->hCSAlias;
 328     pThunk = &pTask->thunks;
 329     base = (int)pThunk - (int)pTask;
 330     while (sel && (sel != HIWORD(thunk)))
 331     {
 332         sel = pThunk->next;
 333         pThunk = (THUNKS *)GlobalLock16( sel );
 334         base = 0;
 335     }
 336     if (!sel) return FALSE;
 337     *(WORD *)((BYTE *)pThunk + LOWORD(thunk) - base) = pThunk->free;
 338     pThunk->free = LOWORD(thunk) - base;
 339     return TRUE;
 340 }
 341 #endif
 342
 343
 344 /***********************************************************************
 345  *           TASK_CallToStart
 346  *
 347  * 32-bit entry point for a new task. This function is responsible for
 348  * setting up the registers and jumping to the 16-bit entry point.
 349  */
 350 #ifndef WINELIB
 351 static void TASK_CallToStart(void)
 352 {
 353     int cs_reg, ds_reg, ip_reg;
 354     TDB *pTask = (TDB *)GlobalLock16( hCurrentTask );
 355     NE_MODULE *pModule = MODULE_GetPtr( pTask->hModule );
 356     SEGTABLEENTRY *pSegTable = NE_SEG_TABLE( pModule );
 357
 358     /* Registers at initialization must be:
 359      * ax   zero
 360      * bx   stack size in bytes
 361      * cx   heap size in bytes
 362      * si   previous app instance
 363      * di   current app instance
 364      * bp   zero
 365      * es   selector to the PSP
 366      * ds   dgroup of the application
 367      * ss   stack selector
 368      * sp   top of the stack
 369      */
 370
 371     cs_reg = pSegTable[pModule->cs - 1].selector;
 372     ip_reg = pModule->ip;
 373     ds_reg = pSegTable[pModule->dgroup - 1].selector;
 374
 375     IF1632_Saved16_ss = pTask->ss;
 376     IF1632_Saved16_sp = pTask->sp;
 377     dprintf_task( stddeb, "Starting main program: cs:ip=%04x:%04x ds=%04x ss:sp=%04x:%04x\n",
 378                  cs_reg, ip_reg, ds_reg,
 379                  IF1632_Saved16_ss, IF1632_Saved16_sp);
 380
 381     CallTo16_regs_( (FARPROC16)(cs_reg << 16 | ip_reg), ds_reg,
 382                    pTask->hPDB /*es*/, 0 /*bp*/, 0 /*ax*/,
 383                    pModule->stack_size /*bx*/, pModule->heap_size /*cx*/,
 384                    0 /*dx*/, 0 /*si*/, ds_reg /*di*/ );
 385
 386     /* This should never return */
 387     fprintf( stderr, "TASK_CallToStart: Main program returned!\n" );
 388     TASK_KillCurrentTask( 1 );
 389 }
 390 #endif
 391
 392
 393 /***********************************************************************
 394  *           TASK_CreateTask
 395  */
 396 HTASK16 TASK_CreateTask( HMODULE16 hModule, HINSTANCE16 hInstance,
 397                          HINSTANCE16 hPrevInstance, HANDLE16 hEnvironment,
 398                          LPCSTR cmdLine, UINT16 cmdShow )
 399 {
 400     HTASK hTask;
 401     TDB *pTask;
 402     HANDLE hParentEnv;
 403     NE_MODULE *pModule;
 404     SEGTABLEENTRY *pSegTable;
 405     LPSTR name;
 406     char filename[256];
 407     char *stack16Top, *stack32Top;
 408     STACK16FRAME *frame16;
 409     STACK32FRAME *frame32;
 410 #ifndef WINELIB32
 411     extern DWORD CALLTO16_RetAddr_word;
 412 #endif
 413
 414     if (!(pModule = MODULE_GetPtr( hModule ))) return 0;
 415     pSegTable = NE_SEG_TABLE( pModule );
 416
 417       /* Allocate the task structure */
 418
 419     hTask = GLOBAL_Alloc( GMEM_FIXED | GMEM_ZEROINIT, sizeof(TDB),
 420                           hModule, FALSE, FALSE, FALSE );
 421     if (!hTask) return 0;
 422     pTask = (TDB *)GlobalLock16( hTask );
 423
 424       /* Allocate the new environment block */
 425
 426     if (!(hParentEnv = hEnvironment))
 427     {
 428         TDB *pParent = (TDB *)GlobalLock16( hCurrentTask );
 429         hParentEnv = pParent ? pParent->pdb.environment : hDOSEnvironment;
 430     }
 431     /* FIXME: do we really need to make a copy also when */
 432     /*        we don't use the parent environment? */
 433     if (!(hEnvironment = GlobalAlloc16( GMEM_FIXED, GlobalSize16(hParentEnv))))
 434     {
 435         GlobalFree16( hTask );
 436         return 0;
 437     }
 438     memcpy( GlobalLock16( hEnvironment ), GlobalLock16( hParentEnv ),
 439             GlobalSize16( hParentEnv ) );
 440
 441       /* Get current directory */
 442
 443     GetModuleFileName( hModule, filename, sizeof(filename) );
 444     name = strrchr(filename, '\\');
 445     if (name) *(name+1) = 0;
 446
 447       /* Fill the task structure */
 448
 449     pTask->nEvents       = 1;  /* So the task can be started */
 450     pTask->hSelf         = hTask;
 451     pTask->flags         = 0;
 452     pTask->version       = pModule->expected_version;
 453     pTask->hInstance     = hInstance;
 454     pTask->hPrevInstance = hPrevInstance;
 455     pTask->hModule       = hModule;
 456     pTask->hParent       = hCurrentTask;
 457     pTask->curdrive      = filename[0] - 'A' + 0x80;
 458     strcpy( pTask->curdir, filename+2 );
 459     pTask->magic         = TDB_MAGIC;
 460     pTask->nCmdShow      = cmdShow;
 461
 462       /* Create the thunks block */
 463
 464     TASK_CreateThunks( hTask, (int)&pTask->thunks - (int)pTask, 7 );
 465
 466       /* Copy the module name */
 467
 468     name = MODULE_GetModuleName( hModule );
 469     strncpy( pTask->module_name, name, sizeof(pTask->module_name) );
 470
 471       /* Allocate a selector for the PDB */
 472
 473     pTask->hPDB = GLOBAL_CreateBlock( GMEM_FIXED, &pTask->pdb, sizeof(PDB),
 474                                       hModule, FALSE, FALSE, FALSE, NULL );
 475
 476       /* Fill the PDB */
 477
 478     pTask->pdb.int20 = 0x20cd;
 479     pTask->pdb.dispatcher[0] = 0x9a;  /* ljmp */
 480 #ifndef WINELIB
 481     *(FARPROC16 *)&pTask->pdb.dispatcher[1] = MODULE_GetEntryPoint( GetModuleHandle("KERNEL"), 102 );  /* KERNEL.102 is DOS3Call() */
 482     pTask->pdb.savedint22 = INT_GetHandler( 0x22 );
 483     pTask->pdb.savedint23 = INT_GetHandler( 0x23 );
 484     pTask->pdb.savedint24 = INT_GetHandler( 0x24 );
 485 #endif
 486     pTask->pdb.fileHandlesPtr =
 487         PTR_SEG_OFF_TO_SEGPTR( GlobalHandleToSel(pTask->hPDB),
 488                                (int)&((PDB *)0)->fileHandles );
 489     memset( pTask->pdb.fileHandles, 0xff, sizeof(pTask->pdb.fileHandles) );
 490     pTask->pdb.environment    = hEnvironment;
 491     pTask->pdb.nbFiles        = 20;
 492     lstrcpyn32A( pTask->pdb.cmdLine + 1, cmdLine, 127 );
 493     pTask->pdb.cmdLine[0] = strlen( pTask->pdb.cmdLine + 1 );
 494
 495       /* Get the compatibility flags */
 496
 497     pTask->compat_flags = GetProfileInt( name, "Compatibility", 0 );
 498
 499       /* Allocate a code segment alias for the TDB */
 500
 501     pTask->hCSAlias = GLOBAL_CreateBlock( GMEM_FIXED, (void *)pTask,
 502                                           sizeof(TDB), pTask->hPDB, TRUE,
 503                                           FALSE, FALSE, NULL );
 504
 505       /* Set the owner of the environment block */
 506
 507     FarSetOwner( pTask->pdb.environment, pTask->hPDB );
 508
 509       /* Default DTA overwrites command-line */
 510
 511     pTask->dta = PTR_SEG_OFF_TO_SEGPTR( pTask->hPDB,
 512                                 (int)&pTask->pdb.cmdLine - (int)&pTask->pdb );
 513
 514       /* Allocate the 32-bit stack */
 515
 516     pTask->hStack32 = GLOBAL_Alloc( GMEM_FIXED, STACK32_SIZE, pTask->hPDB,
 517                                     FALSE, FALSE, FALSE );
 518
 519       /* Create the 32-bit stack frame */
 520
 521     *(DWORD *)GlobalLock16(pTask->hStack32) = 0xDEADBEEF;
 522     stack32Top = (char*)GlobalLock16(pTask->hStack32) + STACK32_SIZE;
 523     frame32 = (STACK32FRAME *)stack32Top - 1;
 524     frame32->saved_esp = (DWORD)stack32Top;
 525     frame32->edi = 0;
 526     frame32->esi = 0;
 527     frame32->edx = 0;
 528     frame32->ecx = 0;
 529     frame32->ebx = 0;
 530     frame32->ebp = 0;
 531 #ifndef WINELIB
 532     frame32->retaddr = (DWORD)TASK_CallToStart;
 533     frame32->codeselector = WINE_CODE_SELECTOR;
 534 #endif
 535     pTask->esp = (DWORD)frame32;
 536
 537       /* Create the 16-bit stack frame */
 538
 539     pTask->ss = hInstance;
 540     pTask->sp = ((pModule->sp != 0) ? pModule->sp :
 541                  pSegTable[pModule->ss-1].minsize + pModule->stack_size) & ~1;
 542     stack16Top = (char *)PTR_SEG_OFF_TO_LIN( pTask->ss, pTask->sp );
 543     frame16 = (STACK16FRAME *)stack16Top - 1;
 544     frame16->saved_ss = 0;
 545     frame16->saved_sp = 0;
 546     frame16->ds = frame16->es = pTask->hInstance;
 547     frame16->entry_point = 0;
 548     frame16->entry_ip = OFFSETOF(TASK_RescheduleProc) + 14;
 549     frame16->entry_cs = SELECTOROF(TASK_RescheduleProc);
 550     frame16->bp = 0;
 551 #ifndef WINELIB
 552     frame16->ip = LOWORD( CALLTO16_RetAddr_word );
 553     frame16->cs = HIWORD( CALLTO16_RetAddr_word );
 554 #endif  /* WINELIB */
 555     pTask->sp -= sizeof(STACK16FRAME);
 556
 557       /* If there's no 16-bit stack yet, use a part of the new task stack */
 558       /* This is only needed to have a stack to switch from on the first  */
 559       /* call to DirectedYield(). */
 560
 561     if (!IF1632_Saved16_ss)
 562     {
 563         IF1632_Saved16_ss = pTask->ss;
 564         IF1632_Saved16_sp = pTask->sp;
 565     }
 566
 567       /* Add a breakpoint at the start of the task */
 568
 569 #ifndef WINELIB
 570     if (Options.debug)
 571     {
 572         if (pModule->flags & NE_FFLAGS_WIN32)
 573         {
 574             DBG_ADDR addr = { 0, pModule->pe_module->load_addr +
 575                               pModule->pe_module->pe_header->opt_coff.AddressOfEntryPoint };
 576             fprintf( stderr, "Win32 task '%s': ", name );
 577             DEBUG_AddBreakpoint( &addr );
 578         }
 579         else
 580         {
 581             DBG_ADDR addr = { pSegTable[pModule->cs-1].selector, pModule->ip };
 582             fprintf( stderr, "Win16 task '%s': ", name );
 583             DEBUG_AddBreakpoint( &addr );
 584         }
 585     }
 586 #endif  /* WINELIB */
 587
 588       /* Add the task to the linked list */
 589
 590     TASK_LinkTask( hTask );
 591
 592     dprintf_task( stddeb, "CreateTask: module='%s' cmdline='%s' task=%04x\n",
 593                   name, cmdLine, hTask );
 594
 595     return hTask;
 596 }
 597
 598
 599 /***********************************************************************
 600  *           TASK_DeleteTask
 601  */
 602 static void TASK_DeleteTask( HTASK hTask )
 603 {
 604     TDB *pTask;
 605     HANDLE hPDB;
 606
 607     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 608     hPDB = pTask->hPDB;
 609
 610     /* Free the task module */
 611
 612     FreeModule16( pTask->hModule );
 613
 614     /* Close all open files of this task */
 615
 616     FILE_CloseAllFiles( pTask->hPDB );
 617
 618     /* Free the selector aliases */
 619
 620     GLOBAL_FreeBlock( pTask->hCSAlias );
 621     GLOBAL_FreeBlock( pTask->hPDB );
 622
 623     /* Free the task structure itself */
 624
 625     GlobalFree16( hTask );
 626
 627     /* Free all memory used by this task (including the 32-bit stack, */
 628     /* the environment block and the thunk segments). */
 629
 630     GlobalFreeAll( hPDB );
 631 }
 632
 633
 634 /***********************************************************************
 635  *           TASK_KillCurrentTask
 636  *
 637  * Kill the currently running task. As it's not possible to kill the
 638  * current task like this, it is simply marked for destruction, and will
 639  * be killed when either TASK_Reschedule or this function is called again
 640  * in the context of another task.
 641  */
 642 void TASK_KillCurrentTask( INT16 exitCode )
 643 {
 644     extern void EXEC_ExitWindows( int retCode );
 645
 646     TDB* pTask = (TDB*) GlobalLock16( hCurrentTask );
 647     if (!pTask) EXEC_ExitWindows(0);  /* No current task yet */
 648
 649     /* Perform USER cleanup */
 650
 651     USER_AppExit( hCurrentTask, pTask->hInstance, pTask->hQueue );
 652
 653     if (hTaskToKill && (hTaskToKill != hCurrentTask))
 654     {
 655         /* If another task is already marked for destruction, */
 656         /* we can kill it now, as we are in another context.  */
 657         TASK_DeleteTask( hTaskToKill );
 658     }
 659
 660     if (nTaskCount <= 1)
 661     {
 662         dprintf_task( stddeb, "Killing the last task, exiting\n" );
 663         EXEC_ExitWindows( 0 );
 664     }
 665
 666     /* Remove the task from the list to be sure we never switch back to it */
 667     TASK_UnlinkTask( hCurrentTask );
 668
 669     hTaskToKill = hCurrentTask;
 670     hLockedTask = 0;
 671
 672     Yield();
 673     /* We should never return from this Yield() */
 674
 675     fprintf(stderr,"It's alive! Alive!!!\n");
 676     exit(1);
 677 }
 678
 679
 680 /***********************************************************************
 681  *           TASK_Reschedule
 682  *
 683  * This is where all the magic of task-switching happens!
 684  *
 685  * This function should only be called via the TASK_SCHEDULE() macro, to make
 686  * sure that all the context is saved correctly.
 687  */
 688 void TASK_Reschedule(void)
 689 {
 690     TDB *pOldTask = NULL, *pNewTask;
 691     HTASK hTask = 0;
 692
 693 #ifdef CONFIG_IPC
 694     dde_reschedule();
 695 #endif
 696       /* First check if there's a task to kill */
 697
 698     if (hTaskToKill && (hTaskToKill != hCurrentTask))
 699     {
 700         TASK_DeleteTask( hTaskToKill );
 701         hTaskToKill = 0;
 702     }
 703
 704     /* Flush any X events that happened in the meantime */
 705
 706     EVENT_WaitXEvent( FALSE );
 707
 708     /* Find a task to yield to */
 709
 710     pOldTask = (TDB *)GlobalLock16( hCurrentTask );
 711     if (pOldTask && pOldTask->hYieldTo)
 712     {
 713         /* If a task is stored in hYieldTo of the current task (put there */
 714         /* by DirectedYield), yield to it only if it has events pending.  */
 715         hTask = pOldTask->hYieldTo;
 716         if (!(pNewTask = (TDB *)GlobalLock16( hTask )) || !pNewTask->nEvents)
 717             hTask = 0;
 718     }
 719
 720     while (!hTask)
 721     {
 722         /* Find a task that has an event pending */
 723
 724         hTask = hFirstTask;
 725         while (hTask)
 726         {
 727             pNewTask = (TDB *)GlobalLock16( hTask );
 728             if (pNewTask->nEvents) break;
 729             hTask = pNewTask->hNext;
 730         }
 731         if (hLockedTask && (hTask != hLockedTask)) hTask = 0;
 732         if (hTask) break;
 733
 734         /* No task found, wait for some events to come in */
 735
 736         EVENT_WaitXEvent( TRUE );
 737     }
 738
 739     if (hTask == hCurrentTask) return;  /* Nothing to do */
 740
 741     pNewTask = (TDB *)GlobalLock16( hTask );
 742     dprintf_task( stddeb, "Switching to task %04x (%.8s)\n",
 743                   hTask, pNewTask->module_name );
 744
 745       /* Save the stacks of the previous task (if any) */
 746
 747     if (pOldTask)
 748     {
 749         pOldTask->ss  = IF1632_Saved16_ss;
 750         pOldTask->sp  = IF1632_Saved16_sp;
 751         pOldTask->esp = IF1632_Saved32_esp;
 752     }
 753     else IF1632_Original32_esp = IF1632_Saved32_esp;
 754
 755      /* Make the task the last in the linked list (round-robin scheduling) */
 756
 757     pNewTask->priority++;
 758     TASK_UnlinkTask( hTask );
 759     TASK_LinkTask( hTask );
 760     pNewTask->priority--;
 761
 762       /* Switch to the new stack */
 763
 764     hCurrentTask = hTask;
 765     IF1632_Saved16_ss   = pNewTask->ss;
 766     IF1632_Saved16_sp   = pNewTask->sp;
 767     IF1632_Saved32_esp  = pNewTask->esp;
 768     IF1632_Stack32_base = WIN16_GlobalLock16( pNewTask->hStack32 );
 769 }
 770
 771
 772 /***********************************************************************
 773  *           InitTask  (KERNEL.91)
 774  */
 775 #ifdef WINELIB
 776 void InitTask(void)
 777 #else
 778 void InitTask( SIGCONTEXT *context )
 779 #endif
 780 {
 781     TDB *pTask;
 782     NE_MODULE *pModule;
 783     SEGTABLEENTRY *pSegTable;
 784     INSTANCEDATA *pinstance;
 785     LONG stacklow, stackhi;
 786
 787 #ifndef WINELIB
 788     EAX_reg(context) = 0;
 789 #endif
 790     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
 791     if (!(pModule = MODULE_GetPtr( pTask->hModule ))) return;
 792
 793 #ifndef WINELIB
 794     NE_InitializeDLLs( pTask->hModule );
 795
 796     /* Registers on return are:
 797      * ax     1 if OK, 0 on error
 798      * cx     stack limit in bytes
 799      * dx     cmdShow parameter
 800      * si     instance handle of the previous instance
 801      * di     instance handle of the new task
 802      * es:bx  pointer to command-line inside PSP
 803      */
 804     EAX_reg(context) = 1;
 805     EBX_reg(context) = 0x81;
 806     ECX_reg(context) = pModule->stack_size;
 807     EDX_reg(context) = pTask->nCmdShow;
 808     ESI_reg(context) = (DWORD)pTask->hPrevInstance;
 809     EDI_reg(context) = (DWORD)pTask->hInstance;
 810     ES_reg (context) = (WORD)pTask->hPDB;
 811
 812     /* Initialize the local heap */
 813     if ( pModule->heap_size )
 814     {
 815         LocalInit( pTask->hInstance, 0, pModule->heap_size );
 816     }
 817 #endif
 818
 819     /* Initialize the INSTANCEDATA structure */
 820     pSegTable = NE_SEG_TABLE( pModule );
 821     stacklow = pSegTable[pModule->ss - 1].minsize;
 822     stackhi  = stacklow + pModule->stack_size;
 823     if (stackhi > 0xffff) stackhi = 0xffff;
 824     pinstance = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN(CURRENT_DS, 0);
 825     pinstance->stackbottom = stackhi; /* yup, that's right. Confused me too. */
 826     pinstance->stacktop    = stacklow;
 827 #ifndef WINELIB
 828     pinstance->stackmin    = IF1632_Saved16_sp;
 829 #endif
 830 }
 831
 832
 833 /***********************************************************************
 834  *           WaitEvent  (KERNEL.30)
 835  */
 836 BOOL WaitEvent( HTASK hTask )
 837 {
 838     TDB *pTask;
 839
 840     if (!hTask) hTask = hCurrentTask;
 841     pTask = (TDB *)GlobalLock16( hTask );
 842     if (pTask->nEvents > 0)
 843     {
 844         pTask->nEvents--;
 845         return FALSE;
 846     }
 847     TASK_SCHEDULE();
 848     /* When we get back here, we have an event */
 849     if (pTask->nEvents > 0) pTask->nEvents--;
 850     else fprintf( stderr, "WaitEvent: reschedule returned without event\n" );
 851     return TRUE;
 852 }
 853
 854
 855 /***********************************************************************
 856  *           PostEvent  (KERNEL.31)
 857  */
 858 void PostEvent( HTASK hTask )
 859 {
 860     TDB *pTask;
 861
 862     if (!hTask) hTask = hCurrentTask;
 863     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 864     pTask->nEvents++;
 865 }
 866
 867
 868 /***********************************************************************
 869  *           SetPriority  (KERNEL.32)
 870  */
 871 void SetPriority( HTASK hTask, int delta )
 872 {
 873     TDB *pTask;
 874     int newpriority;
 875
 876     if (!hTask) hTask = hCurrentTask;
 877     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return;
 878     newpriority = pTask->priority + delta;
 879     if (newpriority < -32) newpriority = -32;
 880     else if (newpriority > 15) newpriority = 15;
 881
 882     pTask->priority = newpriority + 1;
 883     TASK_UnlinkTask( hTask );
 884     TASK_LinkTask( hTask );
 885     pTask->priority--;
 886 }
 887
 888
 889 /***********************************************************************
 890  *           LockCurrentTask  (KERNEL.33)
 891  */
 892 HTASK LockCurrentTask( BOOL bLock )
 893 {
 894     if (bLock) hLockedTask = hCurrentTask;
 895     else hLockedTask = 0;
 896     return hLockedTask;
 897 }
 898
 899
 900 /***********************************************************************
 901  *           IsTaskLocked  (KERNEL.122)
 902  */
 903 HTASK IsTaskLocked(void)
 904 {
 905     return hLockedTask;
 906 }
 907
 908
 909 /***********************************************************************
 910  *           OldYield  (KERNEL.117)
 911  */
 912 void OldYield(void)
 913 {
 914     TDB *pCurTask;
 915
 916     pCurTask = (TDB *)GlobalLock16( hCurrentTask );
 917     if (pCurTask) pCurTask->nEvents++;  /* Make sure we get back here */
 918     TASK_SCHEDULE();
 919     if (pCurTask) pCurTask->nEvents--;
 920 }
 921
 922
 923 /***********************************************************************
 924  *           DirectedYield  (KERNEL.150)
 925  */
 926 void DirectedYield( HTASK hTask )
 927 {
 928     TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
 929     pCurTask->hYieldTo = hTask;
 930     OldYield();
 931 }
 932
 933
 934 /***********************************************************************
 935  *           UserYield  (USER.332)
 936  */
 937 void UserYield(void)
 938 {
 939     TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
 940     MESSAGEQUEUE *queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
 941     /* Handle sent messages */
 942     if (queue && (queue->wakeBits & QS_SENDMESSAGE))
 943         QUEUE_ReceiveMessage( queue );
 944
 945     OldYield();
 946
 947     queue = (MESSAGEQUEUE *)GlobalLock16( pCurTask->hQueue );
 948     if (queue && (queue->wakeBits & QS_SENDMESSAGE))
 949         QUEUE_ReceiveMessage( queue );
 950 }
 951
 952
 953 /***********************************************************************
 954  *           Yield  (KERNEL.29)
 955  */
 956 void Yield(void)
 957 {
 958     TDB *pCurTask = (TDB *)GlobalLock16( hCurrentTask );
 959     if (pCurTask) pCurTask->hYieldTo = 0;
 960     if (pCurTask && pCurTask->hQueue) UserYield();
 961     else OldYield();
 962 }
 963
 964
 965 /***********************************************************************
 966  *           MakeProcInstance16  (KERNEL.51)
 967  */
 968 FARPROC16 MakeProcInstance16( FARPROC16 func, HANDLE16 hInstance )
 969 {
 970 #ifdef WINELIB
 971     return func; /* func can be called directly in Winelib */
 972 #else
 973     BYTE *thunk;
 974     SEGPTR thunkaddr;
 975
 976     thunkaddr = TASK_AllocThunk( hCurrentTask );
 977     if (!thunkaddr) return (FARPROC16)0;
 978     thunk = PTR_SEG_TO_LIN( thunkaddr );
 979
 980     dprintf_task( stddeb, "MakeProcInstance(%08lx,%04x): got thunk %08lx\n",
 981                   (DWORD)func, hInstance, (DWORD)thunkaddr );
 982
 983     *thunk++ = 0xb8;    /* movw instance, %ax */
 984     *thunk++ = (BYTE)(hInstance & 0xff);
 985     *thunk++ = (BYTE)(hInstance >> 8);
 986     *thunk++ = 0xea;    /* ljmp func */
 987     *(DWORD *)thunk = (DWORD)func;
 988     return (FARPROC16)thunkaddr;
 989 #endif
 990 }
 991
 992
 993 /***********************************************************************
 994  *           FreeProcInstance16  (KERNEL.52)
 995  */
 996 void FreeProcInstance16( FARPROC16 func )
 997 {
 998 #ifndef WINELIB
 999     dprintf_task( stddeb, "FreeProcInstance(%08lx)\n", (DWORD)func );
1000     TASK_FreeThunk( hCurrentTask, (SEGPTR)func );
1001 #endif
1002 }
1003
1004
1005 /**********************************************************************
1006  *          GetCodeHandle    (KERNEL.93)
1007  */
1008 HANDLE GetCodeHandle( FARPROC16 proc )
1009 {
1010 #ifndef WINELIB32
1011     HANDLE handle;
1012     BYTE *thunk = (BYTE *)PTR_SEG_TO_LIN( proc );
1013
1014     /* Return the code segment containing 'proc'. */
1015     /* Not sure if this is really correct (shouldn't matter that much). */
1016
1017     /* Check if it is really a thunk */
1018     if ((thunk[0] == 0xb8) && (thunk[3] == 0xea))
1019         handle = GlobalHandle16( thunk[6] + (thunk[7] << 8) );
1020     else
1021         handle = GlobalHandle16( HIWORD(proc) );
1022
1023     return handle;
1024 #else
1025     return (HANDLE)proc;
1026 #endif
1027 }
1028
1029
1030 /***********************************************************************
1031  *           SetTaskQueue  (KERNEL.34)
1032  */
1033 HQUEUE16 SetTaskQueue( HTASK16 hTask, HQUEUE16 hQueue )
1034 {
1035     HQUEUE16 hPrev;
1036     TDB *pTask;
1037
1038     if (!hTask) hTask = hCurrentTask;
1039     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1040
1041     hPrev = pTask->hQueue;
1042     pTask->hQueue = hQueue;
1043
1044     TIMER_SwitchQueue( hPrev, hQueue );
1045
1046     return hPrev;
1047 }
1048
1049
1050 /***********************************************************************
1051  *           GetTaskQueue  (KERNEL.35)
1052  */
1053 HQUEUE16 GetTaskQueue( HTASK16 hTask )
1054 {
1055     TDB *pTask;
1056
1057     if (!hTask) hTask = hCurrentTask;
1058     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return 0;
1059     return pTask->hQueue;
1060 }
1061
1062
1063 /***********************************************************************
1064  *           SwitchStackTo   (KERNEL.108)
1065  */
1066 void SwitchStackTo( WORD seg, WORD ptr, WORD top )
1067 {
1068     TDB *pTask;
1069     STACK16FRAME *oldFrame, *newFrame;
1070     INSTANCEDATA *pData;
1071     UINT16 copySize;
1072
1073     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
1074     if (!(pData = (INSTANCEDATA *)GlobalLock16( seg ))) return;
1075     dprintf_task( stddeb, "SwitchStackTo: old=%04x:%04x new=%04x:%04x\n",
1076                   IF1632_Saved16_ss, IF1632_Saved16_sp, seg, ptr );
1077
1078     /* Save the old stack */
1079
1080     oldFrame           = CURRENT_STACK16;
1081     pData->old_sp      = IF1632_Saved16_sp;
1082     pData->old_ss      = IF1632_Saved16_ss;
1083     pData->stacktop    = top;
1084     pData->stackmin    = ptr;
1085     pData->stackbottom = ptr;
1086
1087     /* Switch to the new stack */
1088
1089     IF1632_Saved16_ss = pTask->ss = seg;
1090     IF1632_Saved16_sp = pTask->sp = ptr - sizeof(STACK16FRAME);
1091     newFrame = CURRENT_STACK16;
1092
1093     /* Copy the stack frame and the local variables to the new stack */
1094
1095     copySize = oldFrame->bp - pData->old_sp;
1096     memcpy( newFrame, oldFrame, MAX( copySize, sizeof(STACK16FRAME) ));
1097 }
1098
1099
1100 /***********************************************************************
1101  *           SwitchStackBack   (KERNEL.109)
1102  *
1103  * Note: the function is declared as 'register' in the spec file in order
1104  * to make sure all registers are preserved, but we don't use them in any
1105  * way, so we don't need a SIGCONTEXT* argument.
1106  */
1107 void SwitchStackBack(void)
1108 {
1109     TDB *pTask;
1110     STACK16FRAME *oldFrame, *newFrame;
1111     INSTANCEDATA *pData;
1112
1113     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return;
1114     if (!(pData = (INSTANCEDATA *)GlobalLock16( IF1632_Saved16_ss ))) return;
1115     if (!pData->old_ss)
1116     {
1117         fprintf( stderr, "SwitchStackBack: no previous SwitchStackTo\n" );
1118         return;
1119     }
1120     dprintf_task( stddeb, "SwitchStackBack: restoring stack %04x:%04x\n",
1121                   pData->old_ss, pData->old_sp );
1122
1123     oldFrame = CURRENT_STACK16;
1124
1125     /* Switch back to the old stack */
1126
1127     IF1632_Saved16_ss = pTask->ss = pData->old_ss;
1128     IF1632_Saved16_sp = pTask->sp = pData->old_sp;
1129     pData->old_ss = pData->old_sp = 0;
1130
1131     /* Build a stack frame for the return */
1132
1133     newFrame = CURRENT_STACK16;
1134     newFrame->saved_ss = oldFrame->saved_ss;
1135     newFrame->saved_sp = oldFrame->saved_sp;
1136     newFrame->entry_ip = oldFrame->entry_ip;
1137     newFrame->entry_cs = oldFrame->entry_cs;
1138     newFrame->bp       = oldFrame->bp;
1139     newFrame->ip       = oldFrame->ip;
1140     newFrame->cs       = oldFrame->cs;
1141 }
1142
1143
1144 /***********************************************************************
1145  *           GetTaskQueueDS  (KERNEL.118)
1146  */
1147 #ifndef WINELIB
1148 void GetTaskQueueDS( SIGCONTEXT *context )
1149 {
1150     DS_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1151 }
1152 #endif  /* WINELIB */
1153
1154
1155 /***********************************************************************
1156  *           GetTaskQueueES  (KERNEL.119)
1157  */
1158 #ifndef WINELIB
1159 void GetTaskQueueES( SIGCONTEXT *context )
1160 {
1161     ES_reg(context) = GlobalHandleToSel( GetTaskQueue(0) );
1162 }
1163 #endif  /* WINELIB */
1164
1165
1166 /***********************************************************************
1167  *           GetCurrentTask   (KERNEL.36)
1168  */
1169 HTASK16 GetCurrentTask(void)
1170 {
1171     return hCurrentTask;
1172 }
1173
1174 DWORD WIN16_GetCurrentTask(void)
1175 {
1176     /* This is the version used by relay code; the first task is */
1177     /* returned in the high word of the result */
1178     return MAKELONG( hCurrentTask, hFirstTask );
1179 }
1180
1181
1182 /***********************************************************************
1183  *           GetCurrentPDB   (KERNEL.37)
1184  */
1185 HANDLE GetCurrentPDB(void)
1186 {
1187     TDB *pTask;
1188
1189     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1190     return pTask->hPDB;
1191 }
1192
1193
1194 /***********************************************************************
1195  *           GetInstanceData   (KERNEL.54)
1196  */
1197 int GetInstanceData( HANDLE instance, WORD buffer, int len )
1198 {
1199     char *ptr = (char *)GlobalLock16( instance );
1200     if (!ptr || !len) return 0;
1201     if ((int)buffer + len >= 0x10000) len = 0x10000 - buffer;
1202     memcpy( (char *)GlobalLock16(CURRENT_DS) + buffer, ptr + buffer, len );
1203     return len;
1204 }
1205
1206
1207 /***********************************************************************
1208  *           GetExeVersion   (KERNEL.105)
1209  */
1210 WORD GetExeVersion(void)
1211 {
1212     TDB *pTask;
1213
1214     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1215     return pTask->version;
1216 }
1217
1218
1219 /***********************************************************************
1220  *           SetErrorMode   (KERNEL.107)
1221  */
1222 UINT SetErrorMode( UINT mode )
1223 {
1224     TDB *pTask;
1225     UINT oldMode;
1226
1227     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1228     oldMode = pTask->error_mode;
1229     pTask->error_mode = mode;
1230     return oldMode;
1231 }
1232
1233
1234 /***********************************************************************
1235  *           GetDOSEnvironment   (KERNEL.131)
1236  */
1237 SEGPTR GetDOSEnvironment(void)
1238 {
1239     TDB *pTask;
1240
1241     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1242     return (SEGPTR)WIN16_GlobalLock16( pTask->pdb.environment );
1243 }
1244
1245
1246 /***********************************************************************
1247  *           GetNumTasks   (KERNEL.152)
1248  */
1249 WORD GetNumTasks(void)
1250 {
1251     return nTaskCount;
1252 }
1253
1254
1255 /***********************************************************************
1256  *           GetTaskDS   (KERNEL.155)
1257  *
1258  * Note: this function apparently returns a DWORD with LOWORD == HIWORD.
1259  * I don't think we need to bother with this.
1260  */
1261 HINSTANCE16 GetTaskDS(void)
1262 {
1263     TDB *pTask;
1264
1265     if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1266     return pTask->hInstance;
1267 }
1268
1269
1270 /***********************************************************************
1271  *           IsTask   (KERNEL.320)
1272  */
1273 BOOL IsTask( HTASK hTask )
1274 {
1275     TDB *pTask;
1276
1277     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return FALSE;
1278     if (GlobalSize16( hTask ) < sizeof(TDB)) return FALSE;
1279     return (pTask->magic == TDB_MAGIC);
1280 }
1281
1282
1283 /***********************************************************************
1284  *           SetTaskSignalProc   (KERNEL.38)
1285  */
1286 FARPROC16 SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
1287 {
1288     TDB *pTask;
1289     FARPROC16 oldProc;
1290
1291     if (!hTask) hTask = hCurrentTask;
1292     if (!(pTask = (TDB *)GlobalLock16( hTask ))) return NULL;
1293     oldProc = pTask->userhandler;
1294     pTask->userhandler = proc;
1295     return oldProc;
1296 }
1297
1298
1299 /***********************************************************************
1300  *           SetSigHandler   (KERNEL.140)
1301  */
1302 WORD SetSigHandler( FARPROC16 newhandler, FARPROC16* oldhandler,
1303                     UINT16 *oldmode, UINT16 newmode, UINT16 flag )
1304 {
1305     fprintf(stdnimp,"SetSigHandler(%p,%p,%p,%d,%d), unimplemented.\n",
1306             newhandler,oldhandler,oldmode,newmode,flag );
1307
1308     if (flag != 1) return 0;
1309     if (!newmode) newhandler = NULL;  /* Default handler */
1310     if (newmode != 4)
1311     {
1312         TDB *pTask;
1313
1314         if (!(pTask = (TDB *)GlobalLock16( hCurrentTask ))) return 0;
1315         if (oldmode) *oldmode = pTask->signal_flags;
1316         pTask->signal_flags = newmode;
1317         if (oldhandler) *oldhandler = pTask->sighandler;
1318         pTask->sighandler = newhandler;
1319     }
1320     return 0;
1321 }
1322
1323
1324 /***********************************************************************
1325  *           GetExePtr   (KERNEL.133)
1326  */
1327 HMODULE16 GetExePtr( HANDLE16 handle )
1328 {
1329     char *ptr;
1330     HTASK16 hTask;
1331     HANDLE16 owner;
1332
1333       /* Check for module handle */
1334
1335     if (!(ptr = GlobalLock16( handle ))) return 0;
1336     if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return handle;
1337
1338       /* Check the owner for module handle */
1339
1340     owner = FarGetOwner( handle );
1341     if (!(ptr = GlobalLock16( owner ))) return 0;
1342     if (((NE_MODULE *)ptr)->magic == NE_SIGNATURE) return owner;
1343
1344       /* Search for this handle and its owner inside all tasks */
1345
1346     hTask = hFirstTask;
1347     while (hTask)
1348     {
1349         TDB *pTask = (TDB *)GlobalLock16( hTask );
1350         if ((hTask == handle) ||
1351             (pTask->hInstance == handle) ||
1352             (pTask->hQueue == handle) ||
1353             (pTask->hPDB == handle)) return pTask->hModule;
1354         if ((hTask == owner) ||
1355             (pTask->hInstance == owner) ||
1356             (pTask->hQueue == owner) ||
1357             (pTask->hPDB == owner)) return pTask->hModule;
1358         hTask = pTask->hNext;
1359     }
1360     return 0;
1361 }
1362
1363
1364 /***********************************************************************
1365  *           TaskFirst   (TOOLHELP.63)
1366  */
1367 BOOL16 TaskFirst( TASKENTRY *lpte )
1368 {
1369     lpte->hNext = hFirstTask;
1370     return TaskNext( lpte );
1371 }
1372
1373
1374 /***********************************************************************
1375  *           TaskNext   (TOOLHELP.64)
1376  */
1377 BOOL16 TaskNext( TASKENTRY *lpte )
1378 {
1379     TDB *pTask;
1380     INSTANCEDATA *pInstData;
1381
1382     dprintf_toolhelp( stddeb, "TaskNext(%p): task=%04x\n", lpte, lpte->hNext );
1383     if (!lpte->hNext) return FALSE;
1384     pTask = (TDB *)GlobalLock16( lpte->hNext );
1385     if (!pTask || pTask->magic != TDB_MAGIC) return FALSE;
1386     pInstData = (INSTANCEDATA *)PTR_SEG_OFF_TO_LIN( pTask->hInstance, 0 );
1387     lpte->hTask         = lpte->hNext;
1388     lpte->hTaskParent   = pTask->hParent;
1389     lpte->hInst         = pTask->hInstance;
1390     lpte->hModule       = pTask->hModule;
1391     lpte->wSS           = pTask->ss;
1392     lpte->wSP           = pTask->sp;
1393     lpte->wStackTop     = pInstData->stacktop;
1394     lpte->wStackMinimum = pInstData->stackmin;
1395     lpte->wStackBottom  = pInstData->stackbottom;
1396     lpte->wcEvents      = pTask->nEvents;
1397     lpte->hQueue        = pTask->hQueue;
1398     strncpy( lpte->szModule, pTask->module_name, 8 );
1399     lpte->szModule[8]   = '\0';
1400     lpte->wPSPOffset    = 0x100;  /*??*/
1401     lpte->hNext         = pTask->hNext;
1402     return TRUE;
1403 }
1404
1405
1406 /***********************************************************************
1407  *           TaskFindHandle   (TOOLHELP.65)
1408  */
1409 BOOL16 TaskFindHandle( TASKENTRY *lpte, HTASK16 hTask )
1410 {
1411     lpte->hNext = hTask;
1412     return TaskNext( lpte );
1413 }
1414
1415
1416 /***********************************************************************
1417  *           GetAppCompatFlags   (KERNEL.354) (USER32.205)
1418  */
1419 DWORD GetAppCompatFlags( HTASK32 hTask )
1420 {
1421     TDB *pTask;
1422
1423     if (!hTask) hTask = GetCurrentTask();
1424     if (!(pTask=(TDB *)GlobalLock16( (HTASK16)hTask ))) return 0;
1425     if (GlobalSize16(hTask) < sizeof(TDB)) return 0;
1426     return pTask->compat_flags;
1427 }