apt-pkg/acquire.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire.cc,v 1.16 1998/11/14 01:39:45 jgg Exp $
   4 /* ######################################################################
   5
   6    Acquire - File Acquiration
   7
   8    The core element for the schedual system is the concept of a named
   9    queue. Each queue is unique and each queue has a name derived from the
  10    URI. The degree of paralization can be controled by how the queue
  11    name is derived from the URI.
  12
  13    ##################################################################### */
  14                                                                         /*}}}*/
  15 // Include Files                                                        /*{{{*/
  16 #ifdef __GNUG__
  17 #pragma implementation "apt-pkg/acquire.h"
  18 #endif
  19 #include <apt-pkg/acquire.h>
  20 #include <apt-pkg/acquire-item.h>
  21 #include <apt-pkg/acquire-worker.h>
  22 #include <apt-pkg/configuration.h>
  23 #include <apt-pkg/error.h>
  24 #include <strutl.h>
  25
  26 #include <dirent.h>
  27 #include <sys/time.h>
  28                                                                         /*}}}*/
  29
  30 // Acquire::pkgAcquire - Constructor                                    /*{{{*/
  31 // ---------------------------------------------------------------------
  32 /* We grab some runtime state from the configuration space */
  33 pkgAcquire::pkgAcquire(pkgAcquireStatus *Log) : Log(Log)
  34 {
  35    Queues = 0;
  36    Configs = 0;
  37    Workers = 0;
  38    ToFetch = 0;
  39    Running = false;
  40
  41    string Mode = _config->Find("Acquire::Queue-Mode","host");
  42    if (strcasecmp(Mode.c_str(),"host") == 0)
  43       QueueMode = QueueHost;
  44    if (strcasecmp(Mode.c_str(),"access") == 0)
  45       QueueMode = QueueAccess;
  46
  47    Debug = _config->FindB("Debug::pkgAcquire",false);
  48 }
  49                                                                         /*}}}*/
  50 // Acquire::~pkgAcquire - Destructor                                    /*{{{*/
  51 // ---------------------------------------------------------------------
  52 /* Free our memory, clean up the queues (destroy the workers) */
  53 pkgAcquire::~pkgAcquire()
  54 {
  55    while (Items.size() != 0)
  56       delete Items[0];
  57
  58    while (Configs != 0)
  59    {
  60       MethodConfig *Jnk = Configs;
  61       Configs = Configs->Next;
  62       delete Jnk;
  63    }
  64
  65    while (Queues != 0)
  66    {
  67       Queue *Jnk = Queues;
  68       Queues = Queues->Next;
  69       delete Jnk;
  70    }
  71 }
  72                                                                         /*}}}*/
  73 // Acquire::Add - Add a new item                                        /*{{{*/
  74 // ---------------------------------------------------------------------
  75 /* This puts an item on the acquire list. This list is mainly for tracking
  76    item status */
  77 void pkgAcquire::Add(Item *Itm)
  78 {
  79    Items.push_back(Itm);
  80 }
  81                                                                         /*}}}*/
  82 // Acquire::Remove - Remove a item                                      /*{{{*/
  83 // ---------------------------------------------------------------------
  84 /* Remove an item from the acquire list. This is usually not used.. */
  85 void pkgAcquire::Remove(Item *Itm)
  86 {
  87    for (vector<Item *>::iterator I = Items.begin(); I < Items.end(); I++)
  88    {
  89       if (*I == Itm)
  90          Items.erase(I);
  91    }
  92 }
  93                                                                         /*}}}*/
  94 // Acquire::Add - Add a worker                                          /*{{{*/
  95 // ---------------------------------------------------------------------
  96 /* A list of workers is kept so that the select loop can direct their FD
  97    usage. */
  98 void pkgAcquire::Add(Worker *Work)
  99 {
 100    Work->NextAcquire = Workers;
 101    Workers = Work;
 102 }
 103                                                                         /*}}}*/
 104 // Acquire::Remove - Remove a worker                                    /*{{{*/
 105 // ---------------------------------------------------------------------
 106 /* A worker has died. This can not be done while the select loop is running
 107    as it would require that RunFds could handling a changing list state and
 108    it cant.. */
 109 void pkgAcquire::Remove(Worker *Work)
 110 {
 111    if (Running == true)
 112       abort();
 113
 114    Worker **I = &Workers;
 115    for (; *I != 0;)
 116    {
 117       if (*I == Work)
 118          *I = (*I)->NextAcquire;
 119       else
 120          I = &(*I)->NextAcquire;
 121    }
 122 }
 123                                                                         /*}}}*/
 124 // Acquire::Enqueue - Queue an URI for fetching                         /*{{{*/
 125 // ---------------------------------------------------------------------
 126 /* This is the entry point for an item. An item calls this function when
 127    it is construction which creates a queue (based on the current queue
 128    mode) and puts the item in that queue. If the system is running then
 129    the queue might be started. */
 130 void pkgAcquire::Enqueue(ItemDesc &Item)
 131 {
 132    // Determine which queue to put the item in
 133    const MethodConfig *Config;
 134    string Name = QueueName(Item.URI,Config);
 135    if (Name.empty() == true)
 136       return;
 137
 138    // Find the queue structure
 139    Queue *I = Queues;
 140    for (; I != 0 && I->Name != Name; I = I->Next);
 141    if (I == 0)
 142    {
 143       I = new Queue(Name,this);
 144       I->Next = Queues;
 145       Queues = I;
 146
 147       if (Running == true)
 148          I->Startup();
 149    }
 150
 151    // See if this is a local only URI
 152    if (Config->LocalOnly == true && Item.Owner->Complete == false)
 153       Item.Owner->Local = true;
 154    Item.Owner->Status = Item::StatIdle;
 155
 156    // Queue it into the named queue
 157    I->Enqueue(Item);
 158    ToFetch++;
 159
 160    // Some trace stuff
 161    if (Debug == true)
 162    {
 163       clog << "Fetching " << Item.URI << endl;
 164       clog << " to " << Item.Owner->DestFile << endl;
 165       clog << " Queue is: " << Name << endl;
 166    }
 167 }
 168                                                                         /*}}}*/
 169 // Acquire::Dequeue - Remove an item from all queues                    /*{{{*/
 170 // ---------------------------------------------------------------------
 171 /* This is called when an item is finished being fetched. It removes it
 172    from all the queues */
 173 void pkgAcquire::Dequeue(Item *Itm)
 174 {
 175    Queue *I = Queues;
 176    bool Res = false;
 177    for (; I != 0; I = I->Next)
 178       Res |= I->Dequeue(Itm);
 179
 180    if (Debug == true)
 181       clog << "Dequeuing " << Itm->DestFile << endl;
 182    if (Res == true)
 183       ToFetch--;
 184 }
 185                                                                         /*}}}*/
 186 // Acquire::QueueName - Return the name of the queue for this URI       /*{{{*/
 187 // ---------------------------------------------------------------------
 188 /* The string returned depends on the configuration settings and the
 189    method parameters. Given something like http://foo.org/bar it can
 190    return http://foo.org or http */
 191 string pkgAcquire::QueueName(string Uri,MethodConfig const *&Config)
 192 {
 193    URI U(Uri);
 194
 195    Config = GetConfig(U.Access);
 196    if (Config == 0)
 197       return string();
 198
 199    /* Single-Instance methods get exactly one queue per URI. This is
 200       also used for the Access queue method  */
 201    if (Config->SingleInstance == true || QueueMode == QueueAccess)
 202        return U.Access;
 203
 204    return U.Access + ':' + U.Host;
 205 }
 206                                                                         /*}}}*/
 207 // Acquire::GetConfig - Fetch the configuration information             /*{{{*/
 208 // ---------------------------------------------------------------------
 209 /* This locates the configuration structure for an access method. If
 210    a config structure cannot be found a Worker will be created to
 211    retrieve it */
 212 pkgAcquire::MethodConfig *pkgAcquire::GetConfig(string Access)
 213 {
 214    // Search for an existing config
 215    MethodConfig *Conf;
 216    for (Conf = Configs; Conf != 0; Conf = Conf->Next)
 217       if (Conf->Access == Access)
 218          return Conf;
 219
 220    // Create the new config class
 221    Conf = new MethodConfig;
 222    Conf->Access = Access;
 223    Conf->Next = Configs;
 224    Configs = Conf;
 225
 226    // Create the worker to fetch the configuration
 227    Worker Work(Conf);
 228    if (Work.Start() == false)
 229       return 0;
 230
 231    return Conf;
 232 }
 233                                                                         /*}}}*/
 234 // Acquire::SetFds - Deal with readable FDs                             /*{{{*/
 235 // ---------------------------------------------------------------------
 236 /* Collect FDs that have activity monitors into the fd sets */
 237 void pkgAcquire::SetFds(int &Fd,fd_set *RSet,fd_set *WSet)
 238 {
 239    for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 240    {
 241       if (I->InReady == true && I->InFd >= 0)
 242       {
 243          if (Fd < I->InFd)
 244             Fd = I->InFd;
 245          FD_SET(I->InFd,RSet);
 246       }
 247       if (I->OutReady == true && I->OutFd >= 0)
 248       {
 249          if (Fd < I->OutFd)
 250             Fd = I->OutFd;
 251          FD_SET(I->OutFd,WSet);
 252       }
 253    }
 254 }
 255                                                                         /*}}}*/
 256 // Acquire::RunFds - Deal with active FDs                               /*{{{*/
 257 // ---------------------------------------------------------------------
 258 /* Dispatch active FDs over to the proper workers. It is very important
 259    that a worker never be erased while this is running! The queue class
 260    should never erase a worker except during shutdown processing. */
 261 void pkgAcquire::RunFds(fd_set *RSet,fd_set *WSet)
 262 {
 263    for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 264    {
 265       if (I->InFd >= 0 && FD_ISSET(I->InFd,RSet) != 0)
 266          I->InFdReady();
 267       if (I->OutFd >= 0 && FD_ISSET(I->OutFd,WSet) != 0)
 268          I->OutFdReady();
 269    }
 270 }
 271                                                                         /*}}}*/
 272 // Acquire::Run - Run the fetch sequence                                /*{{{*/
 273 // ---------------------------------------------------------------------
 274 /* This runs the queues. It manages a select loop for all of the
 275    Worker tasks. The workers interact with the queues and items to
 276    manage the actual fetch. */
 277 bool pkgAcquire::Run()
 278 {
 279    Running = true;
 280
 281    for (Queue *I = Queues; I != 0; I = I->Next)
 282       I->Startup();
 283
 284    if (Log != 0)
 285       Log->Start();
 286
 287    // Run till all things have been acquired
 288    struct timeval tv;
 289    tv.tv_sec = 0;
 290    tv.tv_usec = 500000;
 291    while (ToFetch > 0)
 292    {
 293       fd_set RFds;
 294       fd_set WFds;
 295       int Highest = 0;
 296       FD_ZERO(&RFds);
 297       FD_ZERO(&WFds);
 298       SetFds(Highest,&RFds,&WFds);
 299
 300       int Res = select(Highest+1,&RFds,&WFds,0,&tv);
 301       if (Res < 0)
 302       {
 303          _error->Errno("select","Select has failed");
 304          break;
 305       }
 306
 307       RunFds(&RFds,&WFds);
 308       if (_error->PendingError() == true)
 309          break;
 310
 311       // Timeout, notify the log class
 312       if (Res == 0 || (Log != 0 && Log->Update == true))
 313       {
 314          tv.tv_usec = 500000;
 315          for (Worker *I = Workers; I != 0; I = I->NextAcquire)
 316             I->Pulse();
 317          if (Log != 0)
 318             Log->Pulse(this);
 319       }
 320    }
 321
 322    if (Log != 0)
 323       Log->Stop();
 324
 325    // Shut down the acquire bits
 326    Running = false;
 327    for (Queue *I = Queues; I != 0; I = I->Next)
 328       I->Shutdown();
 329
 330    return !_error->PendingError();
 331 }
 332                                                                         /*}}}*/
 333 // Acquire::Bump - Called when an item is dequeued                      /*{{{*/
 334 // ---------------------------------------------------------------------
 335 /* This routine bumps idle queues in hopes that they will be able to fetch
 336    the dequeued item */
 337 void pkgAcquire::Bump()
 338 {
 339    for (Queue *I = Queues; I != 0; I = I->Next)
 340       I->Bump();
 341 }
 342                                                                         /*}}}*/
 343 // Acquire::WorkerStep - Step to the next worker                        /*{{{*/
 344 // ---------------------------------------------------------------------
 345 /* Not inlined to advoid including acquire-worker.h */
 346 pkgAcquire::Worker *pkgAcquire::WorkerStep(Worker *I)
 347 {
 348    return I->NextAcquire;
 349 };
 350                                                                         /*}}}*/
 351 // Acquire::Clean - Cleans a directory                                  /*{{{*/
 352 // ---------------------------------------------------------------------
 353 /* This is a bit simplistic, it looks at every file in the dir and sees
 354    if it is part of the download set. */
 355 bool pkgAcquire::Clean(string Dir)
 356 {
 357    DIR *D = opendir(Dir.c_str());
 358    if (D == 0)
 359       return _error->Errno("opendir","Unable to read %s",Dir.c_str());
 360
 361    string StartDir = SafeGetCWD();
 362    if (chdir(Dir.c_str()) != 0)
 363    {
 364       closedir(D);
 365       return _error->Errno("chdir","Unable to change to ",Dir.c_str());
 366    }
 367
 368    for (struct dirent *Dir = readdir(D); Dir != 0; Dir = readdir(D))
 369    {
 370       // Skip some files..
 371       if (strcmp(Dir->d_name,"lock") == 0 ||
 372           strcmp(Dir->d_name,"partial") == 0 ||
 373           strcmp(Dir->d_name,".") == 0 ||
 374           strcmp(Dir->d_name,"..") == 0)
 375          continue;
 376
 377       // Look in the get list
 378       vector<Item *>::iterator I = Items.begin();
 379       for (; I != Items.end(); I++)
 380          if (flNotDir((*I)->DestFile) == Dir->d_name)
 381             break;
 382
 383       // Nothing found, nuke it
 384       if (I == Items.end())
 385          unlink(Dir->d_name);
 386    };
 387
 388    chdir(StartDir.c_str());
 389    closedir(D);
 390    return true;
 391 }
 392                                                                         /*}}}*/
 393 // Acquire::TotalNeeded - Number of bytes to fetch                      /*{{{*/
 394 // ---------------------------------------------------------------------
 395 /* This is the total number of bytes needed */
 396 unsigned long pkgAcquire::TotalNeeded()
 397 {
 398    unsigned long Total = 0;
 399    for (pkgAcquire::Item **I = ItemsBegin(); I != ItemsEnd(); I++)
 400       Total += (*I)->FileSize;
 401    return Total;
 402 }
 403                                                                         /*}}}*/
 404 // Acquire::FetchNeeded - Number of bytes needed to get                 /*{{{*/
 405 // ---------------------------------------------------------------------
 406 /* This is the number of bytes that is not local */
 407 unsigned long pkgAcquire::FetchNeeded()
 408 {
 409    unsigned long Total = 0;
 410    for (pkgAcquire::Item **I = ItemsBegin(); I != ItemsEnd(); I++)
 411       if ((*I)->Local == false)
 412          Total += (*I)->FileSize;
 413    return Total;
 414 }
 415                                                                         /*}}}*/
 416
 417 // Acquire::MethodConfig::MethodConfig - Constructor                    /*{{{*/
 418 // ---------------------------------------------------------------------
 419 /* */
 420 pkgAcquire::MethodConfig::MethodConfig()
 421 {
 422    SingleInstance = false;
 423    PreScan = false;
 424    Pipeline = false;
 425    SendConfig = false;
 426    LocalOnly = false;
 427    Next = 0;
 428 }
 429                                                                         /*}}}*/
 430
 431 // Queue::Queue - Constructor                                           /*{{{*/
 432 // ---------------------------------------------------------------------
 433 /* */
 434 pkgAcquire::Queue::Queue(string Name,pkgAcquire *Owner) : Name(Name),
 435             Owner(Owner)
 436 {
 437    Items = 0;
 438    Next = 0;
 439    Workers = 0;
 440 }
 441                                                                         /*}}}*/
 442 // Queue::~Queue - Destructor                                           /*{{{*/
 443 // ---------------------------------------------------------------------
 444 /* */
 445 pkgAcquire::Queue::~Queue()
 446 {
 447    Shutdown();
 448
 449    while (Items != 0)
 450    {
 451       QItem *Jnk = Items;
 452       Items = Items->Next;
 453       delete Jnk;
 454    }
 455 }
 456                                                                         /*}}}*/
 457 // Queue::Enqueue - Queue an item to the queue                          /*{{{*/
 458 // ---------------------------------------------------------------------
 459 /* */
 460 void pkgAcquire::Queue::Enqueue(ItemDesc &Item)
 461 {
 462    // Create a new item
 463    QItem *I = new QItem;
 464    I->Next = Items;
 465    Items = I;
 466    *I = Item;
 467
 468    Item.Owner->QueueCounter++;
 469    if (Items->Next == 0)
 470       Cycle();
 471 }
 472                                                                         /*}}}*/
 473 // Queue::Dequeue - Remove an item from the queue                       /*{{{*/
 474 // ---------------------------------------------------------------------
 475 /* We return true if we hit something*/
 476 bool pkgAcquire::Queue::Dequeue(Item *Owner)
 477 {
 478    bool Res = false;
 479
 480    QItem **I = &Items;
 481    for (; *I != 0;)
 482    {
 483       if ((*I)->Owner == Owner)
 484       {
 485          QItem *Jnk= *I;
 486          *I = (*I)->Next;
 487          Owner->QueueCounter--;
 488          delete Jnk;
 489          Res = true;
 490       }
 491       else
 492          I = &(*I)->Next;
 493    }
 494
 495    return Res;
 496 }
 497                                                                         /*}}}*/
 498 // Queue::Startup - Start the worker processes                          /*{{{*/
 499 // ---------------------------------------------------------------------
 500 /* */
 501 bool pkgAcquire::Queue::Startup()
 502 {
 503    Shutdown();
 504
 505    URI U(Name);
 506    pkgAcquire::MethodConfig *Cnf = Owner->GetConfig(U.Access);
 507    if (Cnf == 0)
 508       return false;
 509
 510    Workers = new Worker(this,Cnf,Owner->Log);
 511    Owner->Add(Workers);
 512    if (Workers->Start() == false)
 513       return false;
 514
 515    return Cycle();
 516 }
 517                                                                         /*}}}*/
 518 // Queue::Shutdown - Shutdown the worker processes                      /*{{{*/
 519 // ---------------------------------------------------------------------
 520 /* */
 521 bool pkgAcquire::Queue::Shutdown()
 522 {
 523    // Delete all of the workers
 524    while (Workers != 0)
 525    {
 526       pkgAcquire::Worker *Jnk = Workers;
 527       Workers = Workers->NextQueue;
 528       Owner->Remove(Jnk);
 529       delete Jnk;
 530    }
 531
 532    return true;
 533 }
 534                                                                         /*}}}*/
 535 // Queue::Finditem - Find a URI in the item list                        /*{{{*/
 536 // ---------------------------------------------------------------------
 537 /* */
 538 pkgAcquire::Queue::QItem *pkgAcquire::Queue::FindItem(string URI,pkgAcquire::Worker *Owner)
 539 {
 540    for (QItem *I = Items; I != 0; I = I->Next)
 541       if (I->URI == URI && I->Worker == Owner)
 542          return I;
 543    return 0;
 544 }
 545                                                                         /*}}}*/
 546 // Queue::ItemDone - Item has been completed                            /*{{{*/
 547 // ---------------------------------------------------------------------
 548 /* The worker signals this which causes the item to be removed from the
 549    queue. If this is the last queue instance then it is removed from the
 550    main queue too.*/
 551 bool pkgAcquire::Queue::ItemDone(QItem *Itm)
 552 {
 553    if (Itm->Owner->QueueCounter <= 1)
 554       Owner->Dequeue(Itm->Owner);
 555    else
 556    {
 557       Dequeue(Itm->Owner);
 558       Owner->Bump();
 559    }
 560
 561    return Cycle();
 562 }
 563                                                                         /*}}}*/
 564 // Queue::Cycle - Queue new items into the method                       /*{{{*/
 565 // ---------------------------------------------------------------------
 566 /* This locates a new idle item and sends it to the worker */
 567 bool pkgAcquire::Queue::Cycle()
 568 {
 569    if (Items == 0 || Workers == 0)
 570       return true;
 571
 572    // Look for a queable item
 573    QItem *I = Items;
 574    for (; I != 0; I = I->Next)
 575       if (I->Owner->Status == pkgAcquire::Item::StatIdle)
 576          break;
 577
 578    // Nothing to do, queue is idle.
 579    if (I == 0)
 580       return true;
 581
 582    I->Worker = Workers;
 583    I->Owner->Status = pkgAcquire::Item::StatFetching;
 584    return Workers->QueueItem(I);
 585 }
 586                                                                         /*}}}*/
 587 // Queue::Bump - Fetch any pending objects if we are idle               /*{{{*/
 588 // ---------------------------------------------------------------------
 589 /* */
 590 void pkgAcquire::Queue::Bump()
 591 {
 592 }
 593                                                                         /*}}}*/
 594
 595 // AcquireStatus::pkgAcquireStatus - Constructor                        /*{{{*/
 596 // ---------------------------------------------------------------------
 597 /* */
 598 pkgAcquireStatus::pkgAcquireStatus()
 599 {
 600    Start();
 601 }
 602                                                                         /*}}}*/
 603 // AcquireStatus::Pulse - Called periodically                           /*{{{*/
 604 // ---------------------------------------------------------------------
 605 /* This computes some internal state variables for the derived classes to
 606    use. It generates the current downloaded bytes and total bytes to download
 607    as well as the current CPS estimate. */
 608 void pkgAcquireStatus::Pulse(pkgAcquire *Owner)
 609 {
 610    TotalBytes = 0;
 611    CurrentBytes = 0;
 612
 613    // Compute the total number of bytes to fetch
 614    unsigned int Unknown = 0;
 615    unsigned int Count = 0;
 616    for (pkgAcquire::Item **I = Owner->ItemsBegin(); I != Owner->ItemsEnd();
 617         I++, Count++)
 618    {
 619       // Totally ignore local items
 620       if ((*I)->Local == true)
 621          continue;
 622
 623       TotalBytes += (*I)->FileSize;
 624       if ((*I)->Complete == true)
 625          CurrentBytes += (*I)->FileSize;
 626       if ((*I)->FileSize == 0 && (*I)->Complete == false)
 627          Unknown++;
 628    }
 629
 630    // Compute the current completion
 631    for (pkgAcquire::Worker *I = Owner->WorkersBegin(); I != 0;
 632         I = Owner->WorkerStep(I))
 633       if (I->CurrentItem != 0 && I->CurrentItem->Owner->Complete == false)
 634          CurrentBytes += I->CurrentSize;
 635
 636    // Normalize the figures and account for unknown size downloads
 637    if (TotalBytes <= 0)
 638       TotalBytes = 1;
 639    if (Unknown == Count)
 640       TotalBytes = Unknown;
 641    else
 642       TotalBytes += TotalBytes/(Count - Unknown)*Unknown;
 643
 644    // Compute the CPS
 645    struct timeval NewTime;
 646    gettimeofday(&NewTime,0);
 647    if (NewTime.tv_sec - Time.tv_sec == 6 && NewTime.tv_usec > Time.tv_usec ||
 648        NewTime.tv_sec - Time.tv_sec > 6)
 649    {
 650       // Compute the delta time with full accuracy
 651       long usdiff = NewTime.tv_usec - Time.tv_usec;
 652       long sdiff = NewTime.tv_sec - Time.tv_sec;
 653
 654       // Borrow
 655       if (usdiff < 0)
 656       {
 657          usdiff += 1000000;
 658          sdiff--;
 659       }
 660
 661       // Compute the CPS value
 662       if (sdiff == 0 && usdiff == 0)
 663          CurrentCPS = 0;
 664       else
 665          CurrentCPS = (CurrentBytes - LastBytes)/(sdiff + usdiff/1000000.0);
 666       LastBytes = CurrentBytes;
 667       ElapsedTime = NewTime.tv_sec - StartTime.tv_sec;
 668       Time = NewTime;
 669    }
 670 }
 671                                                                         /*}}}*/
 672 // AcquireStatus::Start - Called when the download is started           /*{{{*/
 673 // ---------------------------------------------------------------------
 674 /* We just reset the counters */
 675 void pkgAcquireStatus::Start()
 676 {
 677    gettimeofday(&Time,0);
 678    gettimeofday(&StartTime,0);
 679    LastBytes = 0;
 680    CurrentCPS = 0;
 681    CurrentBytes = 0;
 682    TotalBytes = 0;
 683    FetchedBytes = 0;
 684    ElapsedTime = 0;
 685 }
 686                                                                         /*}}}*/
 687 // AcquireStatus::Stop - Finished downloading                           /*{{{*/
 688 // ---------------------------------------------------------------------
 689 /* This accurately computes the elapsed time and the total overall CPS. */
 690 void pkgAcquireStatus::Stop()
 691 {
 692    // Compute the CPS and elapsed time
 693    struct timeval NewTime;
 694    gettimeofday(&NewTime,0);
 695
 696    // Compute the delta time with full accuracy
 697    long usdiff = NewTime.tv_usec - StartTime.tv_usec;
 698    long sdiff = NewTime.tv_sec - StartTime.tv_sec;
 699
 700    // Borrow
 701    if (usdiff < 0)
 702    {
 703       usdiff += 1000000;
 704       sdiff--;
 705    }
 706
 707    // Compute the CPS value
 708    if (sdiff == 0 && usdiff == 0)
 709       CurrentCPS = 0;
 710    else
 711       CurrentCPS = FetchedBytes/(sdiff + usdiff/1000000.0);
 712    LastBytes = CurrentBytes;
 713    ElapsedTime = sdiff;
 714 }
 715                                                                         /*}}}*/
 716 // AcquireStatus::Fetched - Called when a byte set has been fetched     /*{{{*/
 717 // ---------------------------------------------------------------------
 718 /* This is used to get accurate final transfer rate reporting. */
 719 void pkgAcquireStatus::Fetched(unsigned long Size,unsigned long Resume)
 720 {
 721    FetchedBytes += Size - Resume;
 722 }
 723                                                                         /*}}}*/