loader/dos/module.c

   1 /*
   2  * DOS (MZ) loader
   3  *
   4  * Copyright 1998 Ove Kåven
   5  *
   6  * This code hasn't been completely cleaned up yet.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <errno.h>
  13 #include <fcntl.h>
  14 #include <signal.h>
  15 #include <unistd.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include "windef.h"
  20 #include "wine/winbase16.h"
  21 #include "winerror.h"
  22 #include "module.h"
  23 #include "peexe.h"
  24 #include "neexe.h"
  25 #include "task.h"
  26 #include "selectors.h"
  27 #include "file.h"
  28 #include "ldt.h"
  29 #include "process.h"
  30 #include "miscemu.h"
  31 #include "debug.h"
  32 #include "dosexe.h"
  33 #include "dosmod.h"
  34 #include "options.h"
  35 #include "server.h"
  36
  37 DEFAULT_DEBUG_CHANNEL(module)
  38
  39 #ifdef MZ_SUPPORTED
  40
  41 #include <sys/mman.h>
  42
  43 /* define this to try mapping through /proc/pid/mem instead of a temp file,
  44    but Linus doesn't like mmapping /proc/pid/mem, so it doesn't work for me */
  45 #undef MZ_MAPSELF
  46
  47 #define BIOS_DATA_SEGMENT 0x40
  48 #define START_OFFSET 0
  49 #define PSP_SIZE 0x10
  50
  51 #define SEG16(ptr,seg) ((LPVOID)((BYTE*)ptr+((DWORD)(seg)<<4)))
  52 #define SEGPTR16(ptr,segptr) ((LPVOID)((BYTE*)ptr+((DWORD)SELECTOROF(segptr)<<4)+OFFSETOF(segptr)))
  53
  54 static void MZ_InitPSP( LPVOID lpPSP, LPCSTR cmdline, WORD env )
  55 {
  56  PDB16*psp=lpPSP;
  57  const char*cmd=cmdline?strchr(cmdline,' '):NULL;
  58
  59  psp->int20=0x20CD; /* int 20 */
  60  /* some programs use this to calculate how much memory they need */
  61  psp->nextParagraph=0x9FFF;
  62  psp->environment=env;
  63  /* copy parameters */
  64  if (cmd) {
  65 #if 0
  66   /* command.com doesn't do this */
  67   while (*cmd == ' ') cmd++;
  68 #endif
  69   psp->cmdLine[0]=strlen(cmd);
  70   strcpy(psp->cmdLine+1,cmd);
  71   psp->cmdLine[psp->cmdLine[0]+1]='\r';
  72  } else psp->cmdLine[1]='\r';
  73  /* FIXME: integrate the memory stuff from Wine (msdos/dosmem.c) */
  74  /* FIXME: integrate the PDB stuff from Wine (loader/task.c) */
  75 }
  76
  77 /* default INT 08 handler: increases timer tick counter but not much more */
  78 static char int08[]={
  79  0xCD,0x1C,           /* int $0x1c */
  80  0x50,                /* pushw %ax */
  81  0x1E,                /* pushw %ds */
  82  0xB8,0x40,0x00,      /* movw $0x40,%ax */
  83  0x8E,0xD8,           /* movw %ax,%ds */
  84 #if 0
  85  0x83,0x06,0x6C,0x00,0x01, /* addw $1,(0x6c) */
  86  0x83,0x16,0x6E,0x00,0x00, /* adcw $0,(0x6e) */
  87 #else
  88  0x66,0xFF,0x06,0x6C,0x00, /* incl (0x6c) */
  89 #endif
  90  0xB0,0x20,           /* movb $0x20,%al */
  91  0xE6,0x20,           /* outb %al,$0x20 */
  92  0x1F,                /* popw %ax */
  93  0x58,                /* popw %ax */
  94  0xCF                 /* iret */
  95 };
  96
  97 static void MZ_InitHandlers( LPDOSTASK lpDosTask )
  98 {
  99  WORD seg;
 100  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(int08),&seg);
 101  memcpy(start,int08,sizeof(int08));
 102 /* INT 08: point it at our tick-incrementing handler */
 103  ((SEGPTR*)(lpDosTask->img))[0x08]=PTR_SEG_OFF_TO_SEGPTR(seg,0);
 104 /* INT 1C: just point it to IRET, we don't want to handle it ourselves */
 105  ((SEGPTR*)(lpDosTask->img))[0x1C]=PTR_SEG_OFF_TO_SEGPTR(seg,sizeof(int08)-1);
 106 }
 107
 108 static char enter_xms[]={
 109 /* XMS hookable entry point */
 110  0xEB,0x03,           /* jmp entry */
 111  0x90,0x90,0x90,      /* nop;nop;nop */
 112                       /* entry: */
 113 /* real entry point */
 114 /* for simplicity, we'll just use the same hook as DPMI below */
 115  0xCD,0x31,           /* int $0x31 */
 116  0xCB                 /* lret */
 117 };
 118
 119 static void MZ_InitXMS( LPDOSTASK lpDosTask )
 120 {
 121  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,sizeof(enter_xms),&(lpDosTask->xms_seg));
 122  memcpy(start,enter_xms,sizeof(enter_xms));
 123 }
 124
 125 static char enter_pm[]={
 126  0x50,                /* pushw %ax */
 127  0x52,                /* pushw %dx */
 128  0x55,                /* pushw %bp */
 129  0x89,0xE5,           /* movw %sp,%bp */
 130 /* get return CS */
 131  0x8B,0x56,0x08,      /* movw 8(%bp),%dx */
 132 /* just call int 31 here to get into protected mode... */
 133 /* it'll check whether it was called from dpmi_seg... */
 134  0xCD,0x31,           /* int $0x31 */
 135 /* we are now in the context of a 16-bit relay call */
 136 /* need to fixup our stack;
 137  * 16-bit relay return address will be lost, but we won't worry quite yet */
 138  0x8E,0xD0,           /* movw %ax,%ss */
 139  0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
 140 /* set return CS */
 141  0x89,0x56,0x08,      /* movw %dx,8(%bp) */
 142  0x5D,                /* popw %bp */
 143  0x5A,                /* popw %dx */
 144  0x58,                /* popw %ax */
 145  0xCB                 /* lret */
 146 };
 147
 148 static void MZ_InitDPMI( LPDOSTASK lpDosTask )
 149 {
 150  unsigned size=sizeof(enter_pm);
 151  LPBYTE start=DOSMEM_GetBlock(lpDosTask->hModule,size,&(lpDosTask->dpmi_seg));
 152
 153  lpDosTask->dpmi_sel = SELECTOR_AllocBlock( start, size, SEGMENT_CODE, FALSE, FALSE );
 154
 155  memcpy(start,enter_pm,sizeof(enter_pm));
 156 }
 157
 158 static WORD MZ_InitEnvironment( LPDOSTASK lpDosTask, LPCSTR env, LPCSTR name )
 159 {
 160  unsigned sz=0;
 161  WORD seg;
 162  LPSTR envblk;
 163
 164  if (env) {
 165   /* get size of environment block */
 166   while (env[sz++]) sz+=strlen(env+sz)+1;
 167  } else sz++;
 168  /* allocate it */
 169  envblk=DOSMEM_GetBlock(lpDosTask->hModule,sz+sizeof(WORD)+strlen(name)+1,&seg);
 170  /* fill it */
 171  if (env) {
 172   memcpy(envblk,env,sz);
 173  } else envblk[0]=0;
 174  /* DOS 3.x: the block contains 1 additional string */
 175  *(WORD*)(envblk+sz)=1;
 176  /* being the program name itself */
 177  strcpy(envblk+sz+sizeof(WORD),name);
 178  return seg;
 179 }
 180
 181 static BOOL MZ_InitMemory( LPDOSTASK lpDosTask, NE_MODULE *pModule )
 182 {
 183  int x;
 184
 185  if (lpDosTask->img) return TRUE; /* already allocated */
 186
 187  /* allocate 1MB+64K shared memory */
 188  lpDosTask->img_ofs=START_OFFSET;
 189 #ifdef MZ_MAPSELF
 190  lpDosTask->img=VirtualAlloc(NULL,0x110000,MEM_COMMIT,PAGE_READWRITE);
 191  /* make sure mmap accepts it */
 192  ((char*)lpDosTask->img)[0x10FFFF]=0;
 193 #else
 194  tmpnam(lpDosTask->mm_name);
 195 /* strcpy(lpDosTask->mm_name,"/tmp/mydosimage"); */
 196  lpDosTask->mm_fd=open(lpDosTask->mm_name,O_RDWR|O_CREAT /* |O_TRUNC */,S_IRUSR|S_IWUSR);
 197  if (lpDosTask->mm_fd<0) ERR(module,"file %s could not be opened\n",lpDosTask->mm_name);
 198  /* expand file to 1MB+64K */
 199  lseek(lpDosTask->mm_fd,0x110000-1,SEEK_SET);
 200  x=0; write(lpDosTask->mm_fd,&x,1);
 201  /* map it in */
 202  lpDosTask->img=mmap(NULL,0x110000-START_OFFSET,PROT_READ|PROT_WRITE,MAP_SHARED,lpDosTask->mm_fd,0);
 203 #endif
 204  if (lpDosTask->img==(LPVOID)-1) {
 205   ERR(module,"could not map shared memory, error=%s\n",strerror(errno));
 206   return FALSE;
 207  }
 208  TRACE(module,"DOS VM86 image mapped at %08lx\n",(DWORD)lpDosTask->img);
 209  pModule->dos_image=lpDosTask->img;
 210
 211  /* initialize the memory */
 212  TRACE(module,"Initializing DOS memory structures\n");
 213  DOSMEM_Init(lpDosTask->hModule);
 214  MZ_InitHandlers(lpDosTask);
 215  MZ_InitXMS(lpDosTask);
 216  MZ_InitDPMI(lpDosTask);
 217  return TRUE;
 218 }
 219
 220 static BOOL MZ_LoadImage( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline,
 221                           LPCSTR env, LPDOSTASK lpDosTask, NE_MODULE *pModule )
 222 {
 223  IMAGE_DOS_HEADER mz_header;
 224  DWORD image_start,image_size,min_size,max_size,avail;
 225  BYTE*psp_start,*load_start;
 226  int x,old_com=0;
 227  SEGPTR reloc;
 228  WORD env_seg;
 229
 230  _llseek(hFile,0,FILE_BEGIN);
 231  if ((_lread(hFile,&mz_header,sizeof(mz_header)) != sizeof(mz_header)) ||
 232      (mz_header.e_magic != IMAGE_DOS_SIGNATURE)) {
 233   old_com=1; /* assume .COM file */
 234   image_start=0;
 235   image_size=GetFileSize(hFile,NULL);
 236   min_size=0x10000; max_size=0x100000;
 237   mz_header.e_crlc=0;
 238   mz_header.e_ss=0; mz_header.e_sp=0xFFFE;
 239   mz_header.e_cs=0; mz_header.e_ip=0x100;
 240  } else {
 241   /* calculate load size */
 242   image_start=mz_header.e_cparhdr<<4;
 243   image_size=mz_header.e_cp<<9; /* pages are 512 bytes */
 244   if ((mz_header.e_cblp!=0)&&(mz_header.e_cblp!=4)) image_size-=512-mz_header.e_cblp;
 245   image_size-=image_start;
 246   min_size=image_size+((DWORD)mz_header.e_minalloc<<4)+(PSP_SIZE<<4);
 247   max_size=image_size+((DWORD)mz_header.e_maxalloc<<4)+(PSP_SIZE<<4);
 248  }
 249
 250  MZ_InitMemory(lpDosTask,pModule);
 251
 252  /* allocate environment block */
 253  env_seg=MZ_InitEnvironment(lpDosTask,env,ofs->szPathName);
 254
 255  /* allocate memory for the executable */
 256  TRACE(module,"Allocating DOS memory (min=%ld, max=%ld)\n",min_size,max_size);
 257  avail=DOSMEM_Available(lpDosTask->hModule);
 258  if (avail<min_size) {
 259   ERR(module, "insufficient DOS memory\n");
 260   SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 261   return FALSE;
 262  }
 263  if (avail>max_size) avail=max_size;
 264  psp_start=DOSMEM_GetBlock(lpDosTask->hModule,avail,&lpDosTask->psp_seg);
 265  if (!psp_start) {
 266   ERR(module, "error allocating DOS memory\n");
 267   SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 268   return FALSE;
 269  }
 270  lpDosTask->load_seg=lpDosTask->psp_seg+(old_com?0:PSP_SIZE);
 271  load_start=psp_start+(PSP_SIZE<<4);
 272  MZ_InitPSP(psp_start, cmdline, env_seg);
 273
 274  /* load executable image */
 275  TRACE(module,"loading DOS %s image, %08lx bytes\n",old_com?"COM":"EXE",image_size);
 276  _llseek(hFile,image_start,FILE_BEGIN);
 277  if ((_lread(hFile,load_start,image_size)) != image_size) {
 278   SetLastError(ERROR_BAD_FORMAT);
 279   return FALSE;
 280  }
 281
 282  if (mz_header.e_crlc) {
 283   /* load relocation table */
 284   TRACE(module,"loading DOS EXE relocation table, %d entries\n",mz_header.e_crlc);
 285   /* FIXME: is this too slow without read buffering? */
 286   _llseek(hFile,mz_header.e_lfarlc,FILE_BEGIN);
 287   for (x=0; x<mz_header.e_crlc; x++) {
 288    if (_lread(hFile,&reloc,sizeof(reloc)) != sizeof(reloc)) {
 289     SetLastError(ERROR_BAD_FORMAT);
 290     return FALSE;
 291    }
 292    *(WORD*)SEGPTR16(load_start,reloc)+=lpDosTask->load_seg;
 293   }
 294  }
 295
 296  lpDosTask->init_cs=lpDosTask->load_seg+mz_header.e_cs;
 297  lpDosTask->init_ip=mz_header.e_ip;
 298  lpDosTask->init_ss=lpDosTask->load_seg+mz_header.e_ss;
 299  lpDosTask->init_sp=mz_header.e_sp;
 300
 301  TRACE(module,"entry point: %04x:%04x\n",lpDosTask->init_cs,lpDosTask->init_ip);
 302  return TRUE;
 303 }
 304
 305 LPDOSTASK MZ_AllocDPMITask( HMODULE16 hModule )
 306 {
 307  LPDOSTASK lpDosTask = calloc(1, sizeof(DOSTASK));
 308  NE_MODULE *pModule;
 309
 310  if (lpDosTask) {
 311   lpDosTask->hModule = hModule;
 312
 313   pModule = (NE_MODULE *)GlobalLock16(hModule);
 314   pModule->lpDosTask = lpDosTask;
 315
 316   lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
 317
 318   MZ_InitMemory(lpDosTask, pModule);
 319
 320   GlobalUnlock16(hModule);
 321  }
 322  return lpDosTask;
 323 }
 324
 325 static void MZ_InitTimer( LPDOSTASK lpDosTask, int ver )
 326 {
 327  if (ver<1) {
 328   /* can't make timer ticks */
 329  } else {
 330   int func;
 331   struct timeval tim;
 332
 333   /* start dosmod timer at 55ms (18.2Hz) */
 334   func=DOSMOD_SET_TIMER;
 335   tim.tv_sec=0; tim.tv_usec=54925;
 336   write(lpDosTask->write_pipe,&func,sizeof(func));
 337   write(lpDosTask->write_pipe,&tim,sizeof(tim));
 338  }
 339 }
 340
 341 BOOL MZ_InitTask( LPDOSTASK lpDosTask )
 342 {
 343   int write_fd[2],x_fd;
 344   pid_t child;
 345   char *fname,*farg,arg[16],fproc[64],path[256],*fpath;
 346   SECURITY_ATTRIBUTES attr={sizeof(attr),NULL,TRUE};
 347   struct get_read_fd_request r_req;
 348   struct get_write_fd_request w_req;
 349
 350   if (!lpDosTask) return FALSE;
 351   /* create pipes */
 352   /* this happens in the wrong process context, so we have to let the new process
 353      inherit it... (FIXME: call MZ_InitTask in the right process context) */
 354   if (!CreatePipe(&(lpDosTask->hReadPipe),&(lpDosTask->hXPipe),&attr,0)) return FALSE;
 355   if (pipe(write_fd)<0) {
 356     CloseHandle(lpDosTask->hReadPipe);
 357     CloseHandle(lpDosTask->hXPipe);
 358     return FALSE;
 359   }
 360   r_req.handle = lpDosTask->hReadPipe;
 361   CLIENT_SendRequest( REQ_GET_READ_FD, -1, 1, &r_req, sizeof(r_req) );
 362   CLIENT_WaitReply( NULL, &(lpDosTask->read_pipe), 0 );
 363   w_req.handle = lpDosTask->hXPipe;
 364   CLIENT_SendRequest( REQ_GET_WRITE_FD, -1, 1, &w_req, sizeof(w_req) );
 365   CLIENT_WaitReply( NULL, &x_fd, 0 );
 366
 367   TRACE(module,"win32 pipe: read=%d, write=%d, unix pipe: read=%d, write=%d\n",
 368                lpDosTask->hReadPipe,lpDosTask->hXPipe,lpDosTask->read_pipe,x_fd);
 369   TRACE(module,"outbound unix pipe: read=%d, write=%d, pid=%d\n",write_fd[0],write_fd[1],getpid());
 370
 371   lpDosTask->write_pipe=write_fd[1];
 372
 373   lpDosTask->hConInput=GetStdHandle(STD_INPUT_HANDLE);
 374   lpDosTask->hConOutput=GetStdHandle(STD_OUTPUT_HANDLE);
 375
 376   /* if we have a mapping file, use it */
 377   fname=lpDosTask->mm_name; farg=NULL;
 378   if (!fname[0]) {
 379     /* otherwise, map our own memory image */
 380     sprintf(fproc,"/proc/%d/mem",getpid());
 381     sprintf(arg,"%ld",(unsigned long)lpDosTask->img);
 382     fname=fproc; farg=arg;
 383   }
 384
 385   TRACE(module,"Loading DOS VM support module (hmodule=%04x)\n",lpDosTask->hModule);
 386   if ((child=fork())<0) {
 387     close(write_fd[0]);
 388     close(lpDosTask->read_pipe);
 389     close(lpDosTask->write_pipe);
 390     close(x_fd);
 391     CloseHandle(lpDosTask->hReadPipe);
 392     CloseHandle(lpDosTask->hXPipe);
 393     return FALSE;
 394   }
 395  if (child!=0) {
 396   /* parent process */
 397   int ret;
 398
 399   close(write_fd[0]);
 400   close(x_fd);
 401   lpDosTask->task=child;
 402   /* wait for child process to signal readiness */
 403   while (1) {
 404     if (read(lpDosTask->read_pipe,&ret,sizeof(ret))==sizeof(ret)) break;
 405     if ((errno==EINTR)||(errno==EAGAIN)) continue;
 406     /* failure */
 407     ERR(module,"dosmod has failed to initialize\n");
 408     if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
 409     return FALSE;
 410   }
 411   /* the child has now mmaped the temp file, it's now safe to unlink.
 412    * do it here to avoid leaving a mess in /tmp if/when Wine crashes... */
 413   if (lpDosTask->mm_name[0]!=0) unlink(lpDosTask->mm_name);
 414   /* start simulated system timer */
 415   MZ_InitTimer(lpDosTask,ret);
 416   if (ret<2) {
 417     ERR(module,"dosmod version too old! Please install newer dosmod properly\n");
 418     ERR(module,"If you don't, the new dosmod event handling system will not work\n");
 419   }
 420   /* all systems are now go */
 421  } else {
 422   /* child process */
 423   close(lpDosTask->read_pipe);
 424   close(lpDosTask->write_pipe);
 425   /* put our pipes somewhere dosmod can find them */
 426   dup2(write_fd[0],0); /* stdin */
 427   dup2(x_fd,1);        /* stdout */
 428   /* enable signals */
 429   SIGNAL_MaskAsyncEvents(FALSE);
 430   /* now load dosmod */
 431   /* check argv[0]-derived paths first, since the newest dosmod is most likely there
 432    * (at least it was once for Andreas Mohr, so I decided to make it easier for him) */
 433   fpath=strrchr(strcpy(path,Options.argv0),'/');
 434   if (fpath) {
 435    strcpy(fpath,"/dosmod");
 436    execl(path,fname,farg,NULL);
 437    strcpy(fpath,"/loader/dos/dosmod");
 438    execl(path,fname,farg,NULL);
 439   }
 440   /* okay, it wasn't there, try in the path */
 441   execlp("dosmod",fname,farg,NULL);
 442   /* last desperate attempts: current directory */
 443   execl("dosmod",fname,farg,NULL);
 444   /* and, just for completeness... */
 445   execl("loader/dos/dosmod",fname,farg,NULL);
 446   /* if failure, exit */
 447   ERR(module,"Failed to spawn dosmod, error=%s\n",strerror(errno));
 448   exit(1);
 449  }
 450  return TRUE;
 451 }
 452
 453 BOOL MZ_CreateProcess( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline, LPCSTR env,
 454                        LPSECURITY_ATTRIBUTES psa, LPSECURITY_ATTRIBUTES tsa,
 455                        BOOL inherit, DWORD flags, LPSTARTUPINFOA startup,
 456                        LPPROCESS_INFORMATION info )
 457 {
 458  LPDOSTASK lpDosTask = NULL; /* keep gcc from complaining */
 459  HMODULE16 hModule;
 460  PDB *pdb = PROCESS_Current();
 461  TDB *pTask = (TDB*)GlobalLock16( GetCurrentTask() );
 462  NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 463  int alloc = !(pModule && pModule->dos_image);
 464
 465  if (alloc && (lpDosTask = calloc(1, sizeof(DOSTASK))) == NULL) {
 466   SetLastError(ERROR_NOT_ENOUGH_MEMORY);
 467   return FALSE;
 468  }
 469
 470  if ((!env)&&pdb) env = pdb->env_db->environ;
 471  if (alloc) {
 472   if ((hModule = MODULE_CreateDummyModule(ofs, NULL)) < 32) {
 473    SetLastError(hModule);
 474    return FALSE;
 475   }
 476   lpDosTask->hModule = hModule;
 477
 478   pModule = (NE_MODULE *)GlobalLock16(hModule);
 479   pModule->lpDosTask = lpDosTask;
 480
 481   lpDosTask->img=NULL; lpDosTask->mm_name[0]=0; lpDosTask->mm_fd=-1;
 482  } else lpDosTask=pModule->lpDosTask;
 483  if (!MZ_LoadImage( hFile, ofs, cmdline, env, lpDosTask, pModule )) {
 484   if (alloc) {
 485    if (lpDosTask->mm_name[0]!=0) {
 486     if (lpDosTask->img!=NULL) munmap(lpDosTask->img,0x110000-START_OFFSET);
 487     if (lpDosTask->mm_fd>=0) close(lpDosTask->mm_fd);
 488     unlink(lpDosTask->mm_name);
 489    } else
 490     if (lpDosTask->img!=NULL) VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
 491   }
 492   return FALSE;
 493  }
 494  if (alloc) {
 495   pModule->dos_image = lpDosTask->img;
 496   if (!MZ_InitTask( lpDosTask )) {
 497    MZ_KillModule( lpDosTask );
 498    /* FIXME: cleanup hModule */
 499    SetLastError(ERROR_GEN_FAILURE);
 500    return FALSE;
 501   }
 502   inherit = TRUE; /* bad hack for inheriting the CreatePipe... */
 503   if (!PROCESS_Create( pModule, cmdline, env, 0, 0,
 504                        psa, tsa, inherit, flags, startup, info ))
 505    return FALSE;
 506  }
 507  return TRUE;
 508 }
 509
 510 void MZ_KillModule( LPDOSTASK lpDosTask )
 511 {
 512   DOSEVENT *event,*p_event;
 513   DOSSYSTEM *sys,*p_sys;
 514
 515   TRACE(module,"killing DOS task\n");
 516   if (lpDosTask->mm_name[0]!=0) {
 517     munmap(lpDosTask->img,0x110000-START_OFFSET);
 518     close(lpDosTask->mm_fd);
 519   } else VirtualFree(lpDosTask->img,0x110000,MEM_RELEASE);
 520   close(lpDosTask->read_pipe);
 521   close(lpDosTask->write_pipe);
 522   CloseHandle(lpDosTask->hReadPipe);
 523   CloseHandle(lpDosTask->hXPipe);
 524   kill(lpDosTask->task,SIGTERM);
 525 /* free memory allocated for events and systems */
 526 #define DFREE(var,pvar,svar) \
 527   var = lpDosTask->svar; \
 528   while (var) { \
 529     if (var->data) free(var->data); \
 530     pvar = var->next; free(var); var = pvar; \
 531   }
 532
 533   DFREE(event,p_event,pending)
 534   DFREE(event,p_event,current)
 535   DFREE(sys,p_sys,sys)
 536
 537 #undef DFREE
 538
 539 #if 0
 540  /* FIXME: this seems to crash */
 541  if (lpDosTask->dpmi_sel)
 542   UnMapLS(PTR_SEG_OFF_TO_SEGPTR(lpDosTask->dpmi_sel,0));
 543 #endif
 544 }
 545
 546 LPDOSTASK MZ_Current( void )
 547 {
 548   TDB *pTask = (TDB *)GlobalLock16( GetCurrentTask() );
 549   NE_MODULE *pModule = pTask ? NE_GetPtr( pTask->hModule ) : NULL;
 550
 551   GlobalUnlock16( GetCurrentTask() );
 552
 553   if (pModule)
 554     return pModule->lpDosTask;
 555
 556   return NULL;
 557 }
 558
 559 #else /* !MZ_SUPPORTED */
 560
 561 BOOL MZ_CreateProcess( HFILE hFile, OFSTRUCT *ofs, LPCSTR cmdline, LPCSTR env,
 562                        LPSECURITY_ATTRIBUTES psa, LPSECURITY_ATTRIBUTES tsa,
 563                        BOOL inherit, DWORD flags, LPSTARTUPINFOA startup,
 564                        LPPROCESS_INFORMATION info )
 565 {
 566  WARN(module,"DOS executables not supported on this architecture\n");
 567  SetLastError(ERROR_BAD_FORMAT);
 568  return FALSE;
 569 }
 570
 571 LPDOSTASK MZ_Current( void )
 572 {
 573   return NULL;
 574 }
 575
 576 #endif