ipc/dde_proc.c

   1 /***************************************************************************
   2  * Copyright 1995, Technion, Israel Institute of Technology
   3  * Electrical Eng, Software Lab.
   4  * Author:    Michael Veksler.
   5  ***************************************************************************
   6  * File:      dde_proc.c
   7  * Purpose :  DDE signals and processes functionality for DDE
   8  ***************************************************************************
   9  */
  10 #ifdef CONFIG_IPC
  11
  12 #if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
  13 #define msgbuf mymsg
  14 #endif
  15
  16 #include <sys/time.h>
  17 #include <unistd.h>
  18 #include <stdlib.h>
  19 #include <signal.h>
  20 #include <errno.h>
  21 #include <sys/msg.h>
  22 #include "wintypes.h"
  23 #include "win.h"
  24 #include "shm_semaph.h"
  25 #include "shm_main_blk.h"
  26 #include "dde_proc.h"
  27 #include "dde_mem.h"
  28 #include "dde.h"
  29 #include "debug.h"
  30 #include "xmalloc.h"
  31
  32 int curr_proc_idx= -1;
  33
  34 enum stop_wait_op stop_wait_op=CONT;
  35 int had_SIGUSR2 = 0;
  36 sigjmp_buf env_get_ack;
  37 sigjmp_buf env_wait_x;
  38
  39 #define IDX_TO_HWND(idx)  (0xfffe - (idx))
  40 #define HWND_TO_IDX(wnd)  (0xfffe - (wnd))
  41 #define DDE_WIN_INFO(win) ( main_block->windows[HWND_TO_IDX(win)] )
  42 #define DDE_WIN2PROC(win) ( DDE_WIN_INFO(win).proc_idx )
  43 #define DDE_IsRemoteWindow(win)  (  (win)<0xffff && (win)>=(0xffff-DDE_PROCS))
  44 #define DDE_SEND 1
  45 #define DDE_POST 2
  46 #define DDE_ACK  3
  47 #define DDE_MSG_SIZE   sizeof(MSG16)
  48 #define FREE_WND (WORD)(-2)
  49 #define DELETED_WND (WORD)(-3)
  50 static char *msg_type[4]={"********", "DDE_SEND", "DDE_POST", "DDE_ACK"};
  51
  52 struct msg_dat {
  53         struct msgbuf dat;
  54         char filler[DDE_MSG_SIZE];
  55 } ;
  56
  57 typedef struct fifo_element {
  58         int value;
  59         struct fifo_element *next;
  60 } fifo_element;
  61
  62 struct fifo {
  63         fifo_element *first;       /* first element in the fifo or NULL */
  64         fifo_element *last;        /* last element in the fifo or NULL */
  65 };
  66 static struct fifo fifo = {NULL,NULL};
  67
  68 void dde_proc_delete(int proc_idx);
  69
  70 void dde_proc_add_fifo(int val)
  71 {
  72   fifo_element *created;
  73
  74   created= (fifo_element*) xmalloc( sizeof(fifo_element) );
  75   created->value = val;
  76   created->next = NULL;
  77
  78   if (fifo.first==NULL)
  79      fifo.first= created;
  80   else
  81      fifo.last->next= created;
  82   fifo.last = created;
  83 }
  84
  85 /* get an item from the fifo, and return it.
  86  * If fifo is empty, return -1
  87  */
  88 int dde_proc_shift_fifo()
  89 {
  90   int val;
  91   fifo_element *deleted;
  92
  93   if (fifo.first == NULL)
  94      return -1;
  95
  96   deleted= fifo.first;
  97   val= deleted->value;
  98   fifo.first= deleted->next;
  99   if (fifo.first == NULL)
 100      fifo.last= NULL;
 101
 102   free(deleted);
 103   return val;
 104 }
 105
 106 static void print_dde_message(char *desc, MSG16 *msg);
 107
 108 /* This should be run only when main_block is first allocated.  */
 109 void dde_proc_init(dde_proc proc)
 110 {
 111   int proc_num;
 112
 113   for (proc_num=0 ; proc_num<DDE_PROCS ; proc_num++, proc++) {
 114      proc->msg=-1;
 115      proc->sem=-1;
 116      proc->shmid=-1;
 117      proc->pid=-1;
 118   }
 119 }
 120
 121 /* add current process to the list of processes */
 122 void dde_proc_add(dde_proc procs)
 123 {
 124   dde_proc proc;
 125   int proc_idx;
 126   TRACE(dde,"(..)\n");
 127   shm_write_wait(main_block->sem);
 128
 129   /* find free proc_idx and allocate it */
 130   for (proc_idx=0, proc=procs ; proc_idx<DDE_PROCS ; proc_idx++, proc++)
 131      if (proc->pid==-1)
 132         break;                     /* found! */
 133
 134   if (proc_idx<DDE_PROCS) {        /* got here beacuse a free was found ? */
 135      dde_msg_setup(&proc->msg);
 136      proc->pid=getpid();
 137      curr_proc_idx=proc_idx;
 138      shm_sem_init(&proc->sem);
 139   }
 140   else  {
 141      fflush(stdout);
 142      WARN(dde,"Can't allocate process\n");
 143   }
 144   shm_write_signal(main_block->sem);
 145 }
 146
 147 /* wait for dde - acknowledge message - or timout */
 148 static BOOL32 get_ack()
 149 {
 150     struct timeval timeout;
 151     int size;
 152     struct msg_dat ack_buff;
 153
 154     /* timeout after exactly one seconf */
 155     timeout.tv_sec = 1;
 156     timeout.tv_usec = 0;
 157
 158     sigsetjmp(env_get_ack, 1);
 159     /* get here after normal execution, or after siglongjmp */
 160
 161     do {                           /* loop to wait for DDE_ACK */
 162        had_SIGUSR2=0;
 163        stop_wait_op=CONT;          /*  sensitive code: disallow siglongjmp */
 164        size= msgrcv( main_block->proc[curr_proc_idx].msg , &ack_buff.dat,
 165                      1, DDE_ACK, IPC_NOWAIT);
 166        if (size>=0) {
 167           TRACE(msg,"get_ack: received DDE_ACK message\n");
 168           return TRUE;
 169        }
 170        if (DDE_GetRemoteMessage()) {
 171              had_SIGUSR2=1;  /* might have recieved SIGUSR2 */
 172        }
 173        stop_wait_op=STOP_WAIT_ACK; /* allow siglongjmp */
 174
 175     } while (had_SIGUSR2);         /* loop if SIGUSR2 was recieved */
 176
 177     /* siglongjmp should be enabled at this moment */
 178     select( 0, NULL, NULL, NULL, &timeout );
 179     stop_wait_op=CONT;             /* disallow further siglongjmp */
 180
 181     /* timeout !! (otherwise there would have been a siglongjmp) */
 182     return FALSE;
 183 }
 184
 185 /* Transfer one message to a given process */
 186 static BOOL32 DDE_DoOneMessage (int proc_idx, int size, struct msgbuf *msgbuf)
 187 {
 188   dde_proc proc= &main_block->proc[ proc_idx ];
 189
 190
 191   if (proc_idx == curr_proc_idx)
 192      return FALSE;
 193
 194   if (kill(proc->pid,0) < 0) {
 195      /* pid does not exist, or not our */
 196      dde_proc_delete(proc_idx);
 197      return FALSE;
 198   }
 199
 200   if (TRACE_ON(dde) || WARN_ON_dde) {
 201      MSG16 *msg=(MSG16*) &msgbuf->mtext;
 202      char *title;
 203      if (msgbuf->mtype==DDE_SEND)
 204         title="sending dde:";
 205      else if (msgbuf->mtype==DDE_POST)
 206         title="posting dde:";
 207      else
 208         title=NULL;
 209      if (title)
 210          print_dde_message(title, msg);
 211      else
 212        WARN(dde, "Unknown message type=0x%lx\n", msgbuf->mtype);
 213   }
 214   TRACE(msg, "to proc_idx=%d (pid=%d), queue=%u\n",
 215                proc_idx, proc->pid, (unsigned)proc->msg);
 216   if ( proc->msg != -1) {
 217      TRACE(msg, "doing...(type=%s)\n", msg_type[msgbuf->mtype]);
 218      size=msgsnd (proc->msg, msgbuf, size, 0);
 219
 220      if (size<0) {
 221          fflush(stdout);
 222          perror("msgsnd");
 223      }
 224      kill(proc->pid,SIGUSR2);      /* tell the process there is a message */
 225
 226      TRACE(msg, "Trying to get acknowledgment from msg queue=%d\n",
 227                   proc->msg);
 228      Yield16();                 /* force task switch, and */
 229                                 /* acknowledgment sending */
 230      if (get_ack()) {
 231         return TRUE;
 232      } else {
 233         fflush(stdout);
 234         WARN(dde,"get_ack: DDE_DoOneMessage: timeout\n");
 235         return FALSE;
 236      }
 237   }
 238   else {
 239      WARN(msg, "message not sent, target has no message queue\n");
 240      return FALSE;
 241   }
 242 }
 243
 244 /* Do some sort of premitive hash table */
 245 static HWND16 HWND_Local2Remote(HWND16 orig)
 246 {
 247   int dde_wnd_idx;
 248   int deleted_idx= -1;
 249   WND_DATA *tested;
 250   WND_DATA *deleted= NULL;
 251   int i;
 252
 253   dde_wnd_idx= orig % DDE_WINDOWS;
 254   for ( i=0 ; i < DDE_WINDOWS ; i++, dde_wnd_idx++) {
 255     if (dde_wnd_idx >= DDE_WINDOWS)
 256       dde_wnd_idx -= DDE_WINDOWS; /* wrap-around */
 257
 258     tested= &main_block->windows[ dde_wnd_idx ];
 259     if (tested->proc_idx == FREE_WND)
 260       break;
 261
 262     if (deleted == NULL && tested->proc_idx == DELETED_WND) {
 263       deleted= tested;
 264       deleted_idx= dde_wnd_idx;
 265     } else if (tested->wnd == orig && tested->proc_idx == curr_proc_idx) {
 266       return IDX_TO_HWND(dde_wnd_idx);
 267     }
 268   }
 269   if (deleted != NULL)  {       /* deleted is preferable */
 270     /* free item, allocate it */
 271     deleted->proc_idx= curr_proc_idx;
 272     deleted->wnd = orig;
 273     return IDX_TO_HWND(deleted_idx);
 274   }
 275   if (tested->proc_idx == FREE_WND) {
 276     tested->proc_idx= curr_proc_idx;
 277     tested->wnd = orig;
 278     return IDX_TO_HWND(dde_wnd_idx);
 279   }
 280
 281   WARN(dde, "Can't map any more windows to DDE windows\n");
 282   return 0;
 283 }
 284
 285 static BOOL32 DDE_DoMessage( MSG16 *msg, int type )
 286 {
 287   int proc_idx;
 288
 289   MSG16 *remote_message;
 290   struct msg_dat msg_dat;
 291   BOOL32 success;
 292
 293   if (msg->wParam == 0)
 294       return FALSE;
 295
 296   if (main_block==NULL) {
 297     if (msg->message >=  WM_DDE_FIRST && msg->message <= WM_DDE_LAST)
 298       DDE_IPC_init();
 299     else
 300       return FALSE;
 301   }
 302
 303
 304   if (msg->wParam == (HWND16)-1)
 305      return FALSE;
 306
 307   if ( ! DDE_IsRemoteWindow(msg->hwnd) && msg->hwnd!= (HWND16)-1)
 308      return FALSE;
 309
 310   TRACE(msg, "(hwnd=0x%x,msg=0x%x,..) - %s\n",
 311                (int)msg->hwnd,(int)msg->message,msg_type[type]);
 312
 313
 314   TRACE(msg, "(hwnd=0x%x,msg=0x%x,..) -- HWND_BROADCAST !\n",
 315                (int)msg->hwnd,(int)msg->message);
 316   remote_message=(void*)&msg_dat.dat.mtext;
 317
 318   memcpy(remote_message, msg, sizeof(*msg));
 319   remote_message->wParam= HWND_Local2Remote(msg->wParam);
 320   if (remote_message->wParam == 0)
 321     return FALSE;
 322
 323   msg_dat.dat.mtype=type;
 324
 325   if (msg->hwnd == (HWND16)-1) {
 326      success= FALSE;
 327      for ( proc_idx=0; proc_idx < DDE_PROCS ; proc_idx++) {
 328         if (proc_idx == curr_proc_idx)
 329            continue;
 330         if (main_block->proc[ proc_idx ].msg != -1)
 331            success|=DDE_DoOneMessage(proc_idx, DDE_MSG_SIZE, &msg_dat.dat);
 332      }
 333      return success;
 334   } else {
 335      return DDE_DoOneMessage(DDE_WIN2PROC(msg->hwnd), DDE_MSG_SIZE,
 336                              &msg_dat.dat);
 337   }
 338 }
 339
 340 BOOL32 DDE_SendMessage( MSG16 *msg)
 341 {
 342   return DDE_DoMessage(msg, DDE_SEND);
 343 }
 344
 345 BOOL32 DDE_PostMessage( MSG16 *msg)
 346 {
 347   return DDE_DoMessage(msg, DDE_POST);
 348 }
 349
 350
 351 void dde_proc_send_ack(HWND16 wnd, BOOL32 val) {
 352    int proc,msg;
 353
 354    static struct msgbuf msg_ack={DDE_ACK,{'0'}};
 355
 356    proc=DDE_WIN2PROC(wnd);
 357    msg=main_block->proc[proc].msg;
 358    TRACE(msg,"sending ACK to wnd=%4x, proc=%d,msg=%d, pid=%d\n",
 359                 wnd,proc,msg,main_block->proc[proc].pid);
 360
 361    msg_ack.mtext[0]=val;
 362    msgsnd (msg, &msg_ack, 1, 0);
 363    kill(main_block->proc[proc].pid, SIGUSR2);
 364 }
 365
 366 /* return true (non zero) if had a remote message */
 367 #undef DDE_GetRemoteMessage
 368
 369 int DDE_GetRemoteMessage()
 370 {
 371   static int nesting=0;            /* to avoid infinite recursion */
 372
 373   MSG16 *remote_message;
 374   int size;
 375   struct msg_dat msg_dat;
 376   BOOL32 was_sent;                 /* sent/received */
 377   BOOL32 passed;
 378   WND *wndPtr;
 379
 380   if (curr_proc_idx==-1)           /* do we have DDE initialized ? */
 381      return 0;
 382
 383   if (nesting>10) {
 384      fflush(stdout);
 385      ERR(msg, "suspecting infinite recursion, exiting");
 386      return 0;
 387   }
 388
 389   remote_message=(void*)&msg_dat.dat.mtext;
 390
 391   /* test for SendMessage */
 392   size= msgrcv( main_block->proc[curr_proc_idx].msg , &msg_dat.dat,
 393                 DDE_MSG_SIZE, DDE_SEND, IPC_NOWAIT);
 394
 395   if (size==DDE_MSG_SIZE) {        /* is this a correct message (if any) ?*/
 396      was_sent=TRUE;
 397      TRACE(msg, "DDE:receive sent message. msg=%04x wPar=%04x"
 398                   " lPar=%08lx\n",
 399                   remote_message->message, remote_message->wParam,
 400                   remote_message->lParam);
 401   } else {
 402      size= msgrcv( main_block->proc[curr_proc_idx].msg , &msg_dat.dat,
 403                    DDE_MSG_SIZE, DDE_POST, IPC_NOWAIT);
 404
 405      if (size==DDE_MSG_SIZE) {     /* is this a correct message (if any) ?*/
 406         was_sent=FALSE;
 407         TRACE(msg, "DDE:receive posted message. "
 408                     "msg=%04x wPar=%04x lPar=%08lx\n",
 409                     remote_message->message, remote_message->wParam,
 410                     remote_message->lParam);
 411      }
 412      else
 413         return 0;                  /* no DDE message found */
 414   }
 415
 416   /* At this point we are sure that there is a DDE message,
 417    * was_sent is TRUE is the message was sent, and false if it was posted
 418    */
 419
 420   nesting++;
 421
 422   if (TRACE_ON(dde)) {
 423      char *title;
 424      if (was_sent)
 425         title="receive sent dde:";
 426      else
 427         title="receive posted dde:";
 428      print_dde_message(title, remote_message);
 429   }
 430
 431   if (remote_message->hwnd != (HWND16) -1 ) {
 432     HWND16 dde_window= DDE_WIN_INFO(remote_message->hwnd).wnd;
 433      /* we should know exactly where to send the message (locally)*/
 434      if (was_sent) {
 435         TRACE(dde, "SendMessage(wnd=0x%04x, msg=0x%04x, wPar=0x%04x,"
 436                     "lPar=0x%08x\n", dde_window, remote_message->message,
 437                     remote_message->wParam, (int)remote_message->lParam);
 438
 439         /* execute the recieved message */
 440         passed= SendMessage16(dde_window, remote_message->message,
 441                             remote_message->wParam, remote_message->lParam);
 442
 443         /* Tell the sended, that the message is here */
 444         dde_proc_send_ack(remote_message->wParam, passed);
 445      }
 446      else {
 447         passed= PostMessage16(dde_window, remote_message->message,
 448                             remote_message->wParam, remote_message->lParam);
 449         if (passed == FALSE) {
 450            /* Tell the sender, that the message is here, and failed */
 451             dde_proc_send_ack(remote_message->wParam, FALSE);
 452         }
 453         else {
 454            /* ack will be sent later, at the first peek/get message  */
 455            dde_proc_add_fifo(remote_message->wParam);
 456         }
 457      }
 458      nesting--;
 459      return 1;
 460   }
 461
 462   /* iterate through all the windows */
 463   for (wndPtr = WIN_FindWndPtr(GetTopWindow32(GetDesktopWindow32()));
 464        wndPtr != NULL;
 465        wndPtr = wndPtr->next)
 466   {
 467      if (wndPtr->dwStyle & WS_POPUP || wndPtr->dwStyle & WS_CAPTION) {
 468         if (was_sent)
 469            SendMessage16( wndPtr->hwndSelf, remote_message->message,
 470                         remote_message->wParam, remote_message->lParam );
 471         else
 472            PostMessage16( wndPtr->hwndSelf, remote_message->message,
 473                         remote_message->wParam, remote_message->lParam );
 474      } /* if */
 475   } /* for */
 476
 477   /* replay with DDE_ACK after broadcasting in DDE_GetRemoteMessage */
 478   dde_proc_send_ack(remote_message->wParam, TRUE);
 479
 480   nesting--;
 481   return 1;
 482 }
 483
 484 int dde_reschedule()
 485 {
 486     int ack_wnd;
 487
 488     ack_wnd= dde_proc_shift_fifo();
 489     if (ack_wnd != -1) {
 490         dde_proc_send_ack(ack_wnd, TRUE);
 491         usleep(10000);          /* force unix task switch */
 492         return 1;
 493     }
 494     return 0;
 495 }
 496 void dde_msg_setup(int *msg_ptr)
 497 {
 498   *msg_ptr= msgget (IPC_PRIVATE, IPC_CREAT | 0700);
 499   if (*msg_ptr==-1)
 500      perror("dde_msg_setup fails to get message queue");
 501 }
 502
 503 /* do we have dde handling in the window ?
 504  * If we have, atom usage will make this instance of wine set up
 505  * it's IPC stuff.
 506  */
 507 void DDE_TestDDE(HWND16 hwnd)
 508 {
 509   static in_test = 0;
 510   if (in_test++) return;
 511   if (main_block != NULL) {
 512      in_test--;
 513      return;
 514   }
 515   TRACE(msg,"(0x%04x)\n", hwnd);
 516   if (hwnd==0)
 517       hwnd=-1;
 518   /* just send a message to see how things are going */
 519   SendMessage16( hwnd, WM_DDE_INITIATE, 0, 0);
 520   in_test--;
 521 }
 522
 523 void dde_proc_delete(int proc_idx)
 524 {
 525   dde_proc_done(&main_block->proc[proc_idx]);
 526 }
 527 void stop_wait(int a)
 528 {
 529
 530   had_SIGUSR2=1;
 531   switch(stop_wait_op) {
 532     case STOP_WAIT_ACK:
 533       siglongjmp(env_get_ack,1);
 534       break;  /* never reached */
 535     case STOP_WAIT_X:
 536       siglongjmp(env_wait_x,1);
 537       break;  /* never reached */
 538     case CONT:
 539       /* do nothing */
 540   }
 541 }
 542
 543 static void print_dde_message(char *desc, MSG16 *msg)
 544 {
 545 /*    extern const char *MessageTypeNames[];*/
 546     extern int debug_last_handle_size;
 547     WORD wStatus,hWord;
 548     void *ptr;
 549     DDEACK *ddeack;
 550     DDEADVISE *ddeadvise;
 551     DDEDATA *ddedata;
 552     DDEPOKE *ddepoke;
 553     dbg_decl_str(dde, 2048);
 554
 555     if (is_dde_handle(msg->lParam & 0xffff) )
 556         ptr=DDE_AttachHandle(msg->lParam&0xffff, NULL);
 557     else
 558         ptr =NULL;
 559     wStatus=LOWORD(msg->lParam);
 560     hWord=HIWORD(msg->lParam);
 561
 562     dsprintf(dde,"%s", desc);
 563     dsprintf(dde,"%04x %04x==%s %04x %08lx ",
 564             msg->hwnd, msg->message,"",/*MessageTypeNames[msg->message],*/
 565             msg->wParam, msg->lParam);
 566     switch(msg->message) {
 567       case WM_DDE_INITIATE:
 568       case WM_DDE_REQUEST:
 569       case WM_DDE_EXECUTE:
 570       case WM_DDE_TERMINATE:
 571         /* nothing to do */
 572         break;
 573       case WM_DDE_ADVISE:
 574         /* DDEADVISE: hOptions in WM_DDE_ADVISE message */
 575         if (ptr) {
 576            ddeadvise=ptr;
 577            dsprintf(dde,"fDeferUpd=%d,fAckReq=%d,cfFormat=0x%x",
 578                    ddeadvise->fDeferUpd, ddeadvise->fAckReq,
 579                    ddeadvise->cfFormat);
 580         } else
 581            dsprintf(dde,"NO-DATA");
 582         dsprintf(dde," atom=0x%x",hWord);
 583         break;
 584
 585       case WM_DDE_UNADVISE:
 586         dsprintf(dde,"format=0x%x, atom=0x%x",wStatus,hWord);
 587         break;
 588       case WM_DDE_ACK:
 589         ddeack=(DDEACK*)&wStatus;
 590         dsprintf(dde,"bAppReturnCode=%d,fBusy=%d,fAck=%d",
 591                 ddeack->bAppReturnCode, ddeack->fBusy, ddeack->fAck);
 592         if (ddeack->fAck)
 593            dsprintf(dde,"(True)");
 594         else
 595            dsprintf(dde,"(False)");
 596         break;
 597
 598       case WM_DDE_DATA:
 599         if (ptr) {
 600            ddedata=ptr;
 601            dsprintf(dde,"fResponse=%d,fRelease=%d,"
 602                    "fAckReq=%d,cfFormat=0x%x,value=\"%.*s\"",
 603                    ddedata->fResponse, ddedata->fRelease,
 604                    ddedata->fAckReq, ddedata->cfFormat,
 605                    debug_last_handle_size- (int)sizeof(*ddedata)+1,
 606                    ddedata->Value);
 607         } else
 608            dsprintf(dde,"NO-DATA");
 609         dsprintf(dde," atom=0x%04x",hWord);
 610         break;
 611
 612       case WM_DDE_POKE:
 613         if (ptr) {
 614            ddepoke=ptr;
 615            dsprintf(dde,"fRelease=%d,cfFormat=0x%x,value[0]='%c'",
 616                    ddepoke->fRelease, ddepoke->cfFormat, ddepoke->Value[0]);
 617         } else
 618            dsprintf(dde,"NO-DATA");
 619         dsprintf(dde," atom=0x%04x",hWord);
 620         break;
 621     }
 622     TRACE(dde,"%s\n", dbg_str(dde));
 623 }
 624
 625 void dde_proc_done(dde_proc proc)
 626 {
 627   if (proc->msg != -1)
 628      msgctl(proc->msg, IPC_RMID, NULL);
 629   proc->msg=-1;
 630   proc->pid=-1;
 631   shm_delete_chain(&proc->shmid);
 632   shm_sem_done(&proc->sem);
 633 }
 634
 635 /* delete entry, if old junk */
 636 void dde_proc_refresh(dde_proc proc)
 637 {
 638   if (proc->pid == -1)
 639      return;
 640
 641   if (kill(proc->pid, 0) != -1)
 642      return;
 643
 644   /* get here if entry non empty, and the process does not exist */
 645   dde_proc_done(proc);
 646 }
 647
 648 void dde_wnd_setup()
 649 {
 650   int i;
 651
 652   for (i=0 ; i < DDE_WINDOWS ; i++)
 653     main_block->windows[i].proc_idx = FREE_WND;
 654 }
 655
 656 static BOOL32 DDE_ProcHasWindows(int proc_idx)
 657 {
 658   WND_DATA *tested;
 659   int i;
 660
 661   for ( i=0 ; i < DDE_WINDOWS ; i++) {
 662     tested= &main_block->windows[ i ];
 663
 664     if (tested->proc_idx == proc_idx)
 665       return TRUE;
 666   }
 667   return FALSE;
 668 }
 669 /* Look for hwnd in the hash table of DDE windows,
 670  * Delete it from there. If there are no more windows for this
 671  * process, remove the process from the DDE data-structure.
 672  * If there are no more processes - delete the whole DDE struff.
 673  *
 674  * This is inefficient, but who cares for the efficiency of this rare
 675  * operation...
 676  */
 677 void DDE_DestroyWindow(HWND16 hwnd)
 678 {
 679   int dde_wnd_idx;
 680   WND_DATA *tested;
 681   int i;
 682
 683   if (main_block == NULL)
 684     return;
 685
 686   dde_wnd_idx= hwnd % DDE_WINDOWS;
 687
 688   for ( i=0 ; i < DDE_WINDOWS ; i++, dde_wnd_idx++) {
 689     if (dde_wnd_idx >= DDE_WINDOWS)
 690       dde_wnd_idx -= DDE_WINDOWS; /* wrap-around */
 691
 692     tested= &main_block->windows[ dde_wnd_idx ];
 693     if (tested->proc_idx == FREE_WND)
 694       return;                   /* No window will get deleted here */
 695
 696     if (tested->wnd == hwnd && tested->proc_idx == curr_proc_idx) {
 697       dde_reschedule();
 698       tested->proc_idx= DELETED_WND;
 699       if (DDE_ProcHasWindows( curr_proc_idx ))
 700         return;
 701       while (dde_reschedule())  /* make sure there are no other */
 702                                 /* processes waiting for acknowledgment */
 703         ;
 704       dde_proc_delete( curr_proc_idx );
 705       if (DDE_no_of_attached() == 1)
 706         shm_delete_all(-1);
 707       else {
 708         shmdt( (void *) main_block);
 709         main_block= NULL;
 710       }
 711       return;
 712     }
 713   }
 714 }
 715
 716 #endif  /* CONFIG_IPC */