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KIO

kdirwatch.cpp

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// -*- c-basic-offset: 2 -*-
/* This file is part of the KDE libraries
   Copyright (C) 1998 Sven Radej <sven@lisa.exp.univie.ac.at>
   Copyright (C) 2006 Dirk Mueller <mueller@kde.org>
   Copyright (C) 2007 Flavio Castelli <flavio.castelli@gmail.com>
   Copyright (C) 2008 Rafal Rzepecki <divided.mind@gmail.com>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/


// CHANGES:
// Jul 30, 2008 - Don't follow symlinks when recursing to avoid loops (Rafal)
// Aug 6,  2007 - KDirWatch::WatchModes support complete, flags work fine also
// when using FAMD (Flavio Castelli)
// Aug 3,  2007 - Handled KDirWatch::WatchModes flags when using inotify, now
// recursive and file monitoring modes are implemented (Flavio Castelli)
// Jul 30, 2007 - Substituted addEntry boolean params with KDirWatch::WatchModes
// flag (Flavio Castelli)
// Oct 4,  2005 - Inotify support (Dirk Mueller)
// Februar 2002 - Add file watching and remote mount check for STAT
// Mar 30, 2001 - Native support for Linux dir change notification.
// Jan 28, 2000 - Usage of FAM service on IRIX (Josef.Weidendorfer@in.tum.de)
// May 24. 1998 - List of times introduced, and some bugs are fixed. (sven)
// May 23. 1998 - Removed static pointer - you can have more instances.
// It was Needed for KRegistry. KDirWatch now emits signals and doesn't
// call (or need) KFM. No more URL's - just plain paths. (sven)
// Mar 29. 1998 - added docs, stop/restart for particular Dirs and
// deep copies for list of dirs. (sven)
// Mar 28. 1998 - Created.  (sven)

#include "kdirwatch.h"
#include "kdirwatch_p.h"

#include <config-kdirwatch.h>
#include <config.h>

#include <sys/stat.h>
#include <assert.h>
#include <QtCore/QDir>
#include <QtCore/QFile>
#include <QtCore/QSocketNotifier>
#include <QtCore/QTimer>

#include <kapplication.h>
#include <kdebug.h>
#include <kconfig.h>
#include <kglobal.h>
#include <kde_file.h>
#include <kconfiggroup.h>
#include "kmountpoint.h"

#include <stdlib.h>

// debug
#include <sys/ioctl.h>


#include <sys/utsname.h>

#define NO_NOTIFY (time_t) 0

static KDirWatchPrivate* dwp_self = 0;
static KDirWatchPrivate* createPrivate() {
  if (!dwp_self)
    dwp_self = new KDirWatchPrivate;
  return dwp_self;
}


// Convert a string into a WatchMethod
static KDirWatchPrivate::WatchMethod methodFromString(const QString& method) {
  if (method == "Fam") {
    return KDirWatchPrivate::Fam;
  } else if (method == "Stat") {
    return KDirWatchPrivate::Stat;
  } else if (method == "QFSWatch") {
    return KDirWatchPrivate::QFSWatch;
  } else {
#ifdef Q_OS_WIN
    return KDirWatchPrivate::QFSWatch;
#elif defined(Q_OS_FREEBSD)
    return KDirWatchPrivate::Stat;
#else
    return KDirWatchPrivate::INotify;
#endif
  }
}


//
// Class KDirWatchPrivate (singleton)
//

/* All entries (files/directories) to be watched in the
 * application (coming from multiple KDirWatch instances)
 * are registered in a single KDirWatchPrivate instance.
 *
 * At the moment, the following methods for file watching
 * are supported:
 * - Polling: All files to be watched are polled regularly
 *   using stat (more precise: QFileInfo.lastModified()).
 *   The polling frequency is determined from global kconfig
 *   settings, defaulting to 500 ms for local directories
 *   and 5000 ms for remote mounts
 * - FAM (File Alternation Monitor): first used on IRIX, SGI
 *   has ported this method to LINUX. It uses a kernel part
 *   (IMON, sending change events to /dev/imon) and a user
 *   level damon (fam), to which applications connect for
 *   notification of file changes. For NFS, the fam damon
 *   on the NFS server machine is used; if IMON is not built
 *   into the kernel, fam uses polling for local files.
 * - INOTIFY: In LINUX 2.6.13, inode change notification was
 *   introduced. You're now able to watch arbitrary inode's
 *   for changes, and even get notification when they're
 *   unmounted.
 */

KDirWatchPrivate::KDirWatchPrivate()
  : timer(),
    freq( 3600000 ), // 1 hour as upper bound
    statEntries( 0 ),
    m_ref( 0 ),
    delayRemove( false ),
    rescan_all( false ),
    rescan_timer()
{
  timer.setObjectName( "KDirWatchPrivate::timer" );
  connect (&timer, SIGNAL(timeout()), this, SLOT(slotRescan()));

  KConfigGroup config(KGlobal::config(), "DirWatch");
  m_nfsPollInterval = config.readEntry("NFSPollInterval", 5000);
  m_PollInterval = config.readEntry("PollInterval", 500);

  QString method = config.readEntry("PreferredMethod", "inotify");
  m_preferredMethod = methodFromString(method);

  // The nfs method defaults to the normal (local) method
  m_nfsPreferredMethod = methodFromString(config.readEntry("nfsPreferredMethod", method));

  QStringList availableMethods;

  availableMethods << "Stat";

  // used for FAM
  rescan_timer.setObjectName( "KDirWatchPrivate::rescan_timer" );
  rescan_timer.setSingleShot( true );
  connect(&rescan_timer, SIGNAL(timeout()), this, SLOT(slotRescan()));

#ifdef HAVE_FAM
  // It's possible that FAM server can't be started
  if (FAMOpen(&fc) ==0) {
    availableMethods << "FAM";
    use_fam=true;
    sn = new QSocketNotifier( FAMCONNECTION_GETFD(&fc),
                  QSocketNotifier::Read, this);
    connect( sn, SIGNAL(activated(int)),
         this, SLOT(famEventReceived()) );
  }
  else {
    kDebug(7001) << "Can't use FAM (fam daemon not running?)";
    use_fam=false;
  }
#endif

#ifdef HAVE_SYS_INOTIFY_H
  supports_inotify = true;

  m_inotify_fd = inotify_init();

  if ( m_inotify_fd <= 0 ) {
    kDebug(7001) << "Can't use Inotify, kernel doesn't support it";
    supports_inotify = false;
  }

  {
    struct utsname uts;
    int major, minor, patch;
    if (uname(&uts) < 0)
      supports_inotify = false; // *shrug*
    else if (sscanf(uts.release, "%d.%d.%d", &major, &minor, &patch) != 3)
      supports_inotify = false; // *shrug*
    else if( major * 1000000 + minor * 1000 + patch < 2006014 ) { // <2.6.14
      kDebug(7001) << "Can't use INotify, Linux kernel too old";
      supports_inotify = false;
    }
  }

  if ( supports_inotify ) {
    availableMethods << "INotify";
    fcntl(m_inotify_fd, F_SETFD, FD_CLOEXEC);

    mSn = new QSocketNotifier( m_inotify_fd, QSocketNotifier::Read, this );
    connect( mSn, SIGNAL(activated( int )),
             this, SLOT( inotifyEventReceived() ) );
  }
#endif
#ifdef HAVE_QFILESYSTEMWATCHER
  availableMethods << "QFileSystemWatcher";
  fsWatcher = new KFileSystemWatcher();
  connect(fsWatcher, SIGNAL(directoryChanged(QString)), this, SLOT(fswEventReceived(QString)));
  connect(fsWatcher, SIGNAL(fileChanged(QString)),      this, SLOT(fswEventReceived(QString)));
#endif
  kDebug(7001) << "Available methods: " << availableMethods;
}

/* This is called on app exit (K_GLOBAL_STATIC) */
KDirWatchPrivate::~KDirWatchPrivate()
{
  timer.stop();

  /* remove all entries being watched */
  removeEntries(0);

#ifdef HAVE_FAM
  if (use_fam) {
    FAMClose(&fc);
  }
#endif
#ifdef HAVE_SYS_INOTIFY_H
  if ( supports_inotify )
    ::close( m_inotify_fd );
#endif
#ifdef HAVE_QFILESYSTEMWATCHER
  delete fsWatcher;
#endif
}

void KDirWatchPrivate::inotifyEventReceived()
{
  //kDebug(7001);
#ifdef HAVE_SYS_INOTIFY_H
  if ( !supports_inotify )
    return;

  int pending = -1;
  int offset = 0;
  char buf[4096];
  assert( m_inotify_fd > -1 );
  ioctl( m_inotify_fd, FIONREAD, &pending );

  while ( pending > 0 ) {

    if ( pending > (int)sizeof( buf ) )
      pending = sizeof( buf );

    pending = read( m_inotify_fd, buf, pending);

    while ( pending > 0 ) {
      struct inotify_event *event = (struct inotify_event *) &buf[offset];
      pending -= sizeof( struct inotify_event ) + event->len;
      offset += sizeof( struct inotify_event ) + event->len;

      QString path;
      QByteArray cpath(event->name, event->len);
      if(event->len)
        path = QFile::decodeName ( cpath );

      if ( path.length() && isNoisyFile( cpath ) )
        continue;

      // now we're in deep trouble of finding the
      // associated entries
      // for now, we suck and iterate
      for ( EntryMap::Iterator it = m_mapEntries.begin();
            it != m_mapEntries.end();  ) {
        Entry* e = &( *it );
        ++it;
        if ( e->wd == event->wd ) {
          e->dirty = true;

          if( event->mask & IN_DELETE_SELF) {
            kDebug(7001) << "-->got deleteself signal for" << e->path;
            e->m_status = NonExistent;
            if (e->isDir)
              addEntry(0, QDir::cleanPath(e->path+"/.."), e, true);
            else
              addEntry(0, QFileInfo(e->path).absolutePath(), e, true);
          }
          if ( event->mask & IN_IGNORED ) {
            e->wd = 0;
          }
          if ( event->mask & (IN_CREATE|IN_MOVED_TO) ) {
            Entry* sub_entry = e->findSubEntry(e->path + '/' + path);

            if (sub_entry /*&& sub_entry->isDir*/) {
              removeEntry(0, e, sub_entry);
              //KDE_struct_stat stat_buf;
              //QByteArray tpath = QFile::encodeName(path);
              //KDE_stat(tpath, &stat_buf);

              //sub_entry->isDir = S_ISDIR(stat_buf.st_mode);
              //sub_entry->m_ctime = stat_buf.st_ctime;
              //sub_entry->m_status = Normal;
              //sub_entry->m_nlink = stat_buf.st_nlink;

              if(!useINotify(sub_entry))
                useStat(sub_entry);
              sub_entry->dirty = true;
            }
            else if ((e->isDir) && (!e->m_clients.empty())) {

              const QString tpath = e->path + QLatin1Char('/') + path;
              bool isDir = false;
              const QList<Client *> clients = e->clientsForFileOrDir(tpath, &isDir);
              Q_FOREACH(Client *client, clients) {
                // See discussion in addEntry for why we don't addEntry for individual
                // files in WatchFiles mode with inotify.
                if (isDir) {
                  addEntry(client->instance, tpath, 0, isDir,
                           isDir ? client->m_watchModes : KDirWatch::WatchDirOnly);
                }
              }
              if (!clients.isEmpty()) {
                emitEvent(e, Created, e->path+'/'+path);
                kDebug(7001).nospace() << clients.count() << " instance(s) monitoring the new "
                                       << (isDir ? "dir " : "file ") << tpath;
              }
            }
          }
          if (event->mask & (IN_DELETE|IN_MOVED_FROM)) {
            if ((e->isDir) && (!e->m_clients.empty())) {
              Client* client = 0;
              // A file in this directory has been removed.  It wasn't an explicitly
              // watched file as it would have its own watch descriptor, so
              // no addEntry/ removeEntry bookkeeping should be required.  Emit
              // the event immediately if any clients are interested.
              KDE_struct_stat stat_buf;
              QString tpath = e->path + QLatin1Char('/') + path;
              // Unlike clientsForFileOrDir, the stat can fail here (item deleted),
              // so in that case we'll just take both kinds of clients and emit Deleted.
              KDirWatch::WatchModes flag = KDirWatch::WatchSubDirs | KDirWatch::WatchFiles;
              if (KDE::stat(tpath, &stat_buf) == 0) {
                bool isDir = S_ISDIR(stat_buf.st_mode);
                flag = isDir ? KDirWatch::WatchSubDirs : KDirWatch::WatchFiles;
              }
              int counter = 0;
              Q_FOREACH(client, e->m_clients) {
                  if (client->m_watchModes & flag) {
                        counter++;
                  }
              }
              if (counter != 0) {
                  emitEvent (e, Deleted, e->path+'/'+path);
              }
            }
          }
          if (event->mask & (IN_MODIFY|IN_ATTRIB)) {
            if ((e->isDir) && (!e->m_clients.empty())) {
              // A file in this directory has been changed.  No
              // addEntry/ removeEntry bookkeeping should be required.
              // Add the path to the list of pending file changes if
              // there are any interested clients.
              //KDE_struct_stat stat_buf;
              //QByteArray tpath = QFile::encodeName(e->path+'/'+path);
              //KDE_stat(tpath, &stat_buf);
              //bool isDir = S_ISDIR(stat_buf.st_mode);

              // The API doc is somewhat vague as to whether we should emit
              // dirty() for implicitly watched files when WatchFiles has
              // not been specified - we'll assume they are always interested,
              // regardless.
              // Don't worry about duplicates for the time
              // being; this is handled in slotRescan.
              e->m_pendingFileChanges.append(e->path+'/'+path);
            }
          }

          if (!rescan_timer.isActive())
            rescan_timer.start(m_PollInterval); // singleshot

          break;
        }
      }
    }
  }
#endif
}

/* In FAM mode, only entries which are marked dirty are scanned.
 * We first need to mark all yet nonexistent, but possible created
 * entries as dirty...
 */
void KDirWatchPrivate::Entry::propagate_dirty()
{
  foreach(Entry *sub_entry, m_entries)
  {
     if (!sub_entry->dirty)
     {
        sub_entry->dirty = true;
        sub_entry->propagate_dirty();
     }
  }
}


/* A KDirWatch instance is interested in getting events for
 * this file/Dir entry.
 */
void KDirWatchPrivate::Entry::addClient(KDirWatch* instance,
                                        KDirWatch::WatchModes watchModes)
{
  if (instance == 0)
    return;

  foreach(Client* client, m_clients) {
    if (client->instance == instance) {
      client->count++;
      client->m_watchModes = watchModes;
      return;
    }
  }

  Client* client = new Client;
  client->instance = instance;
  client->count = 1;
  client->watchingStopped = instance->isStopped();
  client->pending = NoChange;
  client->m_watchModes = watchModes;

  m_clients.append(client);
}

void KDirWatchPrivate::Entry::removeClient(KDirWatch* instance)
{
  QList<Client *>::iterator it = m_clients.begin();
  const QList<Client *>::iterator end = m_clients.end();
  for ( ; it != end ; ++it ) {
    Client* client = *it;
    if (client->instance == instance) {
      client->count--;
      if (client->count == 0) {
        m_clients.erase(it);
        delete client;
      }
      return;
    }
  }
}

/* get number of clients */
int KDirWatchPrivate::Entry::clients()
{
  int clients = 0;
  foreach(Client* client, m_clients)
    clients += client->count;

  return clients;
}

QList<KDirWatchPrivate::Client *> KDirWatchPrivate::Entry::clientsForFileOrDir(const QString& tpath, bool* isDir) const
{
  QList<Client *> ret;
  KDE_struct_stat stat_buf;
  if (KDE::stat(tpath, &stat_buf) == 0) {
    *isDir = S_ISDIR(stat_buf.st_mode);
    const KDirWatch::WatchModes flag =
      *isDir ? KDirWatch::WatchSubDirs : KDirWatch::WatchFiles;
    Q_FOREACH(Client *client, this->m_clients) {
      if (client->m_watchModes & flag) {
        ret.append(client);
      }
    }
  } else {
    // Happens frequently, e.g. ERROR: couldn't stat "/home/dfaure/.viminfo.tmp"
    //kDebug(7001) << "ERROR: couldn't stat" << tpath;
  }
  // If KDE_stat fails then isDir is not set, but ret is empty anyway
  // so isDir won't be used.
  return ret;
}

KDirWatchPrivate::Entry* KDirWatchPrivate::entry(const QString& _path)
{
// we only support absolute paths
  if (_path.isEmpty() || QDir::isRelativePath(_path)) {
    return 0;
  }

  QString path (_path);

  if ( path.length() > 1 && path.endsWith( QLatin1Char( '/' ) ) )
    path.truncate( path.length() - 1 );

  EntryMap::Iterator it = m_mapEntries.find( path );
  if ( it == m_mapEntries.end() )
    return 0;
  else
    return &(*it);
}

// set polling frequency for a entry and adjust global freq if needed
void KDirWatchPrivate::useFreq(Entry* e, int newFreq)
{
  e->freq = newFreq;

  // a reasonable frequency for the global polling timer
  if (e->freq < freq) {
    freq = e->freq;
    if (timer.isActive()) timer.start(freq);
    kDebug(7001) << "Global Poll Freq is now" << freq << "msec";
  }
}


#if defined(HAVE_FAM)
// setup FAM notification, returns false if not possible
bool KDirWatchPrivate::useFAM(Entry* e)
{
  if (!use_fam) return false;

  // handle FAM events to avoid deadlock
  // (FAM sends back all files in a directory when monitoring)
  famEventReceived();

  e->m_mode = FAMMode;
  e->dirty = false;

  if (e->isDir) {
    if (e->m_status == NonExistent) {
      // If the directory does not exist we watch the parent directory
      addEntry(0, QDir::cleanPath(e->path+"/.."), e, true);
    }
    else {
      int res =FAMMonitorDirectory(&fc, QFile::encodeName(e->path),
                   &(e->fr), e);
      if (res<0) {
    e->m_mode = UnknownMode;
    use_fam=false;
        delete sn; sn = 0;
    return false;
      }
      kDebug(7001).nospace() << " Setup FAM (Req " << FAMREQUEST_GETREQNUM(&(e->fr))
                   << ") for " << e->path;
    }
  }
  else {
    if (e->m_status == NonExistent) {
      // If the file does not exist we watch the directory
      addEntry(0, QFileInfo(e->path).absolutePath(), e, true);
    }
    else {
      int res = FAMMonitorFile(&fc, QFile::encodeName(e->path),
                   &(e->fr), e);
      if (res<0) {
    e->m_mode = UnknownMode;
    use_fam=false;
        delete sn; sn = 0;
    return false;
      }

      kDebug(7001).nospace() << " Setup FAM (Req " << FAMREQUEST_GETREQNUM(&(e->fr))
                   << ") for " << e->path;
    }
  }

  // handle FAM events to avoid deadlock
  // (FAM sends back all files in a directory when monitoring)
  famEventReceived();

  return true;
}
#endif

#ifdef HAVE_SYS_INOTIFY_H
// setup INotify notification, returns false if not possible
bool KDirWatchPrivate::useINotify( Entry* e )
{
  //kDebug (7001) << "trying to use inotify for monitoring";

  e->wd = 0;
  e->dirty = false;

  if (!supports_inotify) return false;

  e->m_mode = INotifyMode;

  if ( e->m_status == NonExistent ) {
    addEntry(0, QDir::cleanPath(e->path+"/.."), e, true);
    return true;
  }

  // May as well register for almost everything - it's free!
  int mask = IN_DELETE|IN_DELETE_SELF|IN_CREATE|IN_MOVE|IN_MOVE_SELF|IN_DONT_FOLLOW|IN_MOVED_FROM|IN_MODIFY|IN_ATTRIB;

  if ( ( e->wd = inotify_add_watch( m_inotify_fd,
                                    QFile::encodeName( e->path ), mask) ) > 0)
  {
    //kDebug (7001) << "inotify successfully used for monitoring";
    return true;
  }

  return false;
}
#endif
#ifdef HAVE_QFILESYSTEMWATCHER
bool KDirWatchPrivate::useQFSWatch(Entry* e)
{
  e->m_mode = QFSWatchMode;
  e->dirty = false;

  if ( e->m_status == NonExistent ) {
    addEntry( 0, QDir::cleanPath( e->path + "/.." ), e, true );
    return true;
  }

  fsWatcher->addPath( e->path );
  return true;
}
#endif

bool KDirWatchPrivate::useStat(Entry* e)
{
  KMountPoint::Ptr mp = KMountPoint::currentMountPoints().findByPath(e->path);
  const bool slow = mp ? mp->probablySlow() : false;
  if (slow)
    useFreq(e, m_nfsPollInterval);
  else
    useFreq(e, m_PollInterval);

  if (e->m_mode != StatMode) {
    e->m_mode = StatMode;
    statEntries++;

    if ( statEntries == 1 ) {
      // if this was first STAT entry (=timer was stopped)
      timer.start(freq);      // then start the timer
      kDebug(7001) << " Started Polling Timer, freq " << freq;
    }
  }

  kDebug(7001) << " Setup Stat (freq " << e->freq << ") for " << e->path;

  return true;
}


/* If <instance> !=0, this KDirWatch instance wants to watch at <_path>,
 * providing in <isDir> the type of the entry to be watched.
 * Sometimes, entries are dependant on each other: if <sub_entry> !=0,
 * this entry needs another entry to watch himself (when notExistent).
 */
void KDirWatchPrivate::addEntry(KDirWatch* instance, const QString& _path,
                Entry* sub_entry, bool isDir, KDirWatch::WatchModes watchModes)
{
  QString path (_path);
  if (path.isEmpty()
#ifndef Q_WS_WIN
    || path.startsWith("/dev/") || (path == "/dev")
#endif
  )
    return; // Don't even go there.

  if ( path.length() > 1 && path.endsWith( QLatin1Char( '/' ) ) )
    path.truncate( path.length() - 1 );

  EntryMap::Iterator it = m_mapEntries.find( path );
  if ( it != m_mapEntries.end() )
  {
    if (sub_entry) {
       (*it).m_entries.append(sub_entry);
       kDebug(7001) << "Added already watched Entry" << path
                    << "(for" << sub_entry->path << ")";
#ifdef HAVE_SYS_INOTIFY_H
       Entry* e = &(*it);
       if( (e->m_mode == INotifyMode) && (e->wd > 0) ) {
         int mask = IN_DELETE|IN_DELETE_SELF|IN_CREATE|IN_MOVE|IN_MOVE_SELF|IN_DONT_FOLLOW;
         if(!e->isDir)
           mask |= IN_MODIFY|IN_ATTRIB;
         else
           mask |= IN_ONLYDIR;

         inotify_rm_watch (m_inotify_fd, e->wd);
         e->wd = inotify_add_watch( m_inotify_fd, QFile::encodeName( e->path ),
                                    mask);
       }
#endif
    }
    else {
       (*it).addClient(instance, watchModes);
       kDebug(7001) << "Added already watched Entry" << path
             << "(now" <<  (*it).clients() << "clients)"
             << QString("[%1]").arg(instance->objectName());
    }
    return;
  }

  // we have a new path to watch

  KDE_struct_stat stat_buf;
  bool exists = (KDE::stat(path, &stat_buf) == 0);

  EntryMap::iterator newIt = m_mapEntries.insert( path, Entry() );
  // the insert does a copy, so we have to use <e> now
  Entry* e = &(*newIt);

  if (exists) {
    e->isDir = S_ISDIR(stat_buf.st_mode);

    if (e->isDir && !isDir) {
      KDE::lstat(path, &stat_buf);
      if (S_ISLNK(stat_buf.st_mode))
        // if it's a symlink, don't follow it
        e->isDir = false;
      else
        qWarning() << "KDirWatch:" << path << "is a directory. Use addDir!";
    } else if (!e->isDir && isDir)
      qWarning("KDirWatch: %s is a file. Use addFile!", qPrintable(path));

    if (!e->isDir && ( watchModes != KDirWatch::WatchDirOnly)) {
      qWarning() << "KDirWatch:" << path << "is a file. You can't use recursive or "
                    "watchFiles options";
      watchModes = KDirWatch::WatchDirOnly;
    }

#ifdef Q_OS_WIN
    // ctime is the 'creation time' on windows - use mtime instead
    e->m_ctime = stat_buf.st_mtime;
#else
    e->m_ctime = stat_buf.st_ctime;
#endif
    e->m_status = Normal;
    e->m_nlink = stat_buf.st_nlink;
  }
  else {
    e->isDir = isDir;
    e->m_ctime = invalid_ctime;
    e->m_status = NonExistent;
    e->m_nlink = 0;
  }

  e->path = path;
  if (sub_entry)
    e->m_entries.append(sub_entry);
  else
    e->addClient(instance, watchModes);

  kDebug(7001).nospace() << "Added " << (e->isDir ? "Dir " : "File ") << path
    << (e->m_status == NonExistent ? " NotExisting" : "")
    << " for " << (sub_entry ? sub_entry->path : "")
    << " [" << (instance ? instance->objectName() : "") << "]";

  // now setup the notification method
  e->m_mode = UnknownMode;
  e->msecLeft = 0;

  if ( isNoisyFile( QFile::encodeName( path ) ) )
    return;

  if (exists && e->isDir && (watchModes != KDirWatch::WatchDirOnly)) {
    QFlags<QDir::Filter> filters = QDir::NoDotAndDotDot;

    if ((watchModes & KDirWatch::WatchSubDirs) &&
        (watchModes & KDirWatch::WatchFiles)) {
      filters |= (QDir::Dirs|QDir::Files);
    } else if (watchModes & KDirWatch::WatchSubDirs) {
      filters |= QDir::Dirs;
    } else if (watchModes & KDirWatch::WatchFiles) {
      filters |= QDir::Files;
    }

#if defined(HAVE_SYS_INOTIFY_H)
    if (e->m_mode == INotifyMode || (e->m_mode == UnknownMode && m_preferredMethod == INotify)  )
    {
        kDebug (7001) << "Ignoring WatchFiles directive - this is implicit with inotify";
        // Placing a watch on individual files is redundant with inotify
        // (inotify gives us WatchFiles functionality "for free") and indeed
        // actively harmful, so prevent it.  WatchSubDirs is necessary, though.
        filters &= ~QDir::Files;
    }
#endif

    QDir basedir (e->path);
    const QFileInfoList contents = basedir.entryInfoList(filters);
    for (QFileInfoList::const_iterator iter = contents.constBegin();
         iter != contents.constEnd(); ++iter)
    {
      const QFileInfo &fileInfo = *iter;
      // treat symlinks as files--don't follow them.
      bool isDir = fileInfo.isDir() && !fileInfo.isSymLink();

      addEntry (instance, fileInfo.absoluteFilePath(), 0, isDir,
                isDir ? watchModes : KDirWatch::WatchDirOnly);
    }
  }

  // If the watch is on a network filesystem use the nfsPreferredMethod as the
  // default, otherwise use preferredMethod as the default, if the methods are
  // the same we can skip the mountpoint check

  // This allows to configure a different method for NFS mounts, since inotify
  // cannot detect changes made by other machines. However as a default inotify
  // is fine, since the most common case is a NFS-mounted home, where all changes
  // are made locally. #177892.
  WatchMethod preferredMethod = m_preferredMethod;
  if (m_nfsPreferredMethod != m_preferredMethod) {
    KMountPoint::Ptr mountPoint = KMountPoint::currentMountPoints().findByPath(e->path);
    if (mountPoint && mountPoint->probablySlow()) {
      preferredMethod = m_nfsPreferredMethod;
    }
  }

  // Try the appropriate preferred method from the config first
  bool entryAdded = false;
  switch (preferredMethod) {
#if defined(HAVE_FAM)
  case Fam: entryAdded = useFAM(e); break;
#endif
#if defined(HAVE_SYS_INOTIFY_H)
  case INotify: entryAdded = useINotify(e); break;
#endif
#if defined(HAVE_QFILESYSTEMWATCHER)
  case QFSWatch: entryAdded = useQFSWatch(e); break;
#endif
  case Stat: entryAdded = useStat(e); break;
  default: break;
  }

  // Failing that try in order INotify, FAM, QFSWatch, Stat
  if (!entryAdded) {
#if defined(HAVE_SYS_INOTIFY_H)
    if (useINotify(e)) return;
#endif
#if defined(HAVE_FAM)
    if (useFAM(e)) return;
#endif
#if defined(HAVE_QFILESYSTEMWATCHER)
    if (useQFSWatch(e)) return;
#endif
    useStat(e);
  }
}


void KDirWatchPrivate::removeEntry(KDirWatch* instance,
                                   const QString& _path,
                                   Entry* sub_entry)
{
  //kDebug(7001) << "path=" << _path << "sub_entry:" << sub_entry;
  Entry* e = entry(_path);
  if (!e) {
    kWarning(7001) << "doesn't know" << _path;
    return;
  }

  removeEntry(instance, e, sub_entry);
}

void KDirWatchPrivate::removeEntry(KDirWatch* instance,
                                   Entry* e,
                                   Entry* sub_entry)
{
  removeList.remove(e);

  if (sub_entry)
    e->m_entries.removeAll(sub_entry);
  else
    e->removeClient(instance);

  if (e->m_clients.count() || e->m_entries.count())
    return;

  if (delayRemove) {
    removeList.insert(e);
    // now e->isValid() is false
    return;
  }

#ifdef HAVE_FAM
  if (e->m_mode == FAMMode) {
    if ( e->m_status == Normal) {
      FAMCancelMonitor(&fc, &(e->fr) );
      kDebug(7001).nospace()  << "Cancelled FAM (Req " << FAMREQUEST_GETREQNUM(&(e->fr))
                    << ") for " << e->path;
    }
    else {
      if (e->isDir)
    removeEntry(0, QDir::cleanPath(e->path+"/.."), e);
      else
    removeEntry(0, QFileInfo(e->path).absolutePath(), e);
    }
  }
#endif

#ifdef HAVE_SYS_INOTIFY_H
  if (e->m_mode == INotifyMode) {
    if ( e->m_status == Normal ) {
      (void) inotify_rm_watch( m_inotify_fd, e->wd );
      kDebug(7001).nospace() << "Cancelled INotify (fd " << m_inotify_fd << ", "
                             << e->wd << ") for " << e->path;
    }
    else {
      if (e->isDir)
        removeEntry(0, QDir::cleanPath(e->path+"/.."), e);
      else
        removeEntry(0, QFileInfo(e->path).absolutePath(), e);
    }
  }
#endif

#ifdef HAVE_QFILESYSTEMWATCHER
  if (e->m_mode == QFSWatchMode) {
    fsWatcher->removePath(e->path);
  }
#endif
  if (e->m_mode == StatMode) {
    statEntries--;
    if ( statEntries == 0 ) {
      timer.stop(); // stop timer if lists are empty
      kDebug(7001) << " Stopped Polling Timer";
    }
  }

  //kDebug(7001).nospace() << "Removed " << (e->isDir ? "Dir ":"File ") << e->path
  //   << " for " << (sub_entry ? sub_entry->path : "")
  //   << " [" << (instance ? instance->objectName() : "") << "]";
  m_mapEntries.remove( e->path ); // <e> not valid any more
}


/* Called from KDirWatch destructor:
 * remove <instance> as client from all entries
 */
void KDirWatchPrivate::removeEntries( KDirWatch* instance )
{
  int minfreq = 3600000;

  QStringList pathList;
  // put all entries where instance is a client in list
  EntryMap::Iterator it = m_mapEntries.begin();
  for( ; it != m_mapEntries.end(); ++it ) {
    Client* c = 0;
    foreach(Client* client, (*it).m_clients) {
      if (client->instance == instance) {
        c = client;
        break;
      }
    }
    if (c) {
      c->count = 1; // forces deletion of instance as client
      pathList.append((*it).path);
    }
    else if ( (*it).m_mode == StatMode && (*it).freq < minfreq )
      minfreq = (*it).freq;
  }

  foreach(const QString &path, pathList)
    removeEntry(instance, path, 0);

  if (minfreq > freq) {
    // we can decrease the global polling frequency
    freq = minfreq;
    if (timer.isActive()) timer.start(freq);
    kDebug(7001) << "Poll Freq now" << freq << "msec";
  }
}

// instance ==0: stop scanning for all instances
bool KDirWatchPrivate::stopEntryScan( KDirWatch* instance, Entry* e)
{
  int stillWatching = 0;
  foreach(Client* client, e->m_clients) {
    if (!instance || instance == client->instance)
      client->watchingStopped = true;
    else if (!client->watchingStopped)
      stillWatching += client->count;
  }

  kDebug(7001)  << (instance ? instance->objectName() : "all")
                << "stopped scanning" << e->path << "(now"
                << stillWatching << "watchers)";

  if (stillWatching == 0) {
    // if nobody is interested, we don't watch
    if ( e->m_mode != INotifyMode ) {
      e->m_ctime = invalid_ctime; // invalid
      e->m_status = NonExistent;
    }
    //    e->m_status = Normal;
  }
  return true;
}

// instance ==0: start scanning for all instances
bool KDirWatchPrivate::restartEntryScan( KDirWatch* instance, Entry* e,
                     bool notify)
{
  int wasWatching = 0, newWatching = 0;
  foreach(Client* client, e->m_clients) {
    if (!client->watchingStopped)
      wasWatching += client->count;
    else if (!instance || instance == client->instance) {
      client->watchingStopped = false;
      newWatching += client->count;
    }
  }
  if (newWatching == 0)
    return false;

  kDebug(7001)  << (instance ? instance->objectName() : "all")
                << "restarted scanning" << e->path
                << "(now" << wasWatching+newWatching << "watchers)";

  // restart watching and emit pending events

  int ev = NoChange;
  if (wasWatching == 0) {
    if (!notify) {
      KDE_struct_stat stat_buf;
      bool exists = (KDE::stat(e->path, &stat_buf) == 0);
      if (exists) {
#ifdef Q_OS_WIN
        // ctime is the 'creation time' on windows - use mtime instead
        e->m_ctime = stat_buf.st_mtime;
#else
        e->m_ctime = stat_buf.st_ctime;
#endif
        e->m_status = Normal;
        e->m_nlink = stat_buf.st_nlink;
      }
      else {
        e->m_ctime = invalid_ctime;
        e->m_status = NonExistent;
        e->m_nlink = 0;
      }
    }
    e->msecLeft = 0;
    ev = scanEntry(e);
  }
  emitEvent(e,ev);

  return true;
}

// instance ==0: stop scanning for all instances
void KDirWatchPrivate::stopScan(KDirWatch* instance)
{
  EntryMap::Iterator it = m_mapEntries.begin();
  for( ; it != m_mapEntries.end(); ++it )
    stopEntryScan(instance, &(*it));
}


void KDirWatchPrivate::startScan(KDirWatch* instance,
                                 bool notify, bool skippedToo )
{
  if (!notify)
    resetList(instance,skippedToo);

  EntryMap::Iterator it = m_mapEntries.begin();
  for( ; it != m_mapEntries.end(); ++it )
    restartEntryScan(instance, &(*it), notify);

  // timer should still be running when in polling mode
}


// clear all pending events, also from stopped
void KDirWatchPrivate::resetList( KDirWatch* /*instance*/, bool skippedToo )
{
  EntryMap::Iterator it = m_mapEntries.begin();
  for( ; it != m_mapEntries.end(); ++it ) {

    foreach(Client* client, (*it).m_clients) {
      if (!client->watchingStopped || skippedToo)
        client->pending = NoChange;
    }
  }
}

// Return event happened on <e>
//
int KDirWatchPrivate::scanEntry(Entry* e)
{
#ifdef HAVE_FAM
  if (e->m_mode == FAMMode) {
    // we know nothing has changed, no need to stat
    if(!e->dirty) return NoChange;
    e->dirty = false;
  }
#endif

  // Shouldn't happen: Ignore "unknown" notification method
  if (e->m_mode == UnknownMode) return NoChange;

#if defined( HAVE_SYS_INOTIFY_H )
  if (e->m_mode == DNotifyMode || e->m_mode == INotifyMode ) {
    // we know nothing has changed, no need to stat
    if(!e->dirty) return NoChange;
    e->dirty = false;
  }
#endif

#if defined( HAVE_QFILESYSTEMWATCHER )
  if (e->m_mode == QFSWatchMode ) {
    // we know nothing has changed, no need to stat
    if(!e->dirty) return NoChange;
    e->dirty = false;
  }
#endif

  if (e->m_mode == StatMode) {
    // only scan if timeout on entry timer happens;
    // e.g. when using 500msec global timer, a entry
    // with freq=5000 is only watched every 10th time

    e->msecLeft -= freq;
    if (e->msecLeft>0) return NoChange;
    e->msecLeft += e->freq;
  }

  KDE_struct_stat stat_buf;
  bool exists = (KDE::stat(e->path, &stat_buf) == 0);
  if (exists) {

    if (e->m_status == NonExistent) {
#ifdef Q_OS_WIN
      // ctime is the 'creation time' on windows - use mtime instead
      e->m_ctime = stat_buf.st_mtime;
#else
      e->m_ctime = stat_buf.st_ctime;
#endif
      e->m_status = Normal;
      e->m_nlink = stat_buf.st_nlink;
      return Created;
    }

#ifdef Q_OS_WIN
    stat_buf.st_ctime = stat_buf.st_mtime;
#endif
    if ( (e->m_ctime != invalid_ctime) &&
          ((stat_buf.st_ctime != e->m_ctime) ||
          (stat_buf.st_nlink != (nlink_t) e->m_nlink))
#if defined( HAVE_QFILESYSTEMWATCHER )
          // we trust QFSW to get it right, the ctime comparisons above
          // fail for example when adding files to directories on Windows
          // which doesn't change the mtime of the directory
        ||(e->m_mode == QFSWatchMode )
#endif
    ) {
      e->m_ctime = stat_buf.st_ctime;
      e->m_nlink = stat_buf.st_nlink;
      return Changed;
    }

    return NoChange;
  }

  // dir/file doesn't exist

  if (e->m_ctime == invalid_ctime) {
    e->m_nlink = 0;
    e->m_status = NonExistent;
    return NoChange;
  }

  e->m_ctime = invalid_ctime;
  e->m_nlink = 0;
  e->m_status = NonExistent;

  return Deleted;
}

/* Notify all interested KDirWatch instances about a given event on an entry
 * and stored pending events. When watching is stopped, the event is
 * added to the pending events.
 */
void KDirWatchPrivate::emitEvent(const Entry* e, int event, const QString &fileName)
{
  QString path (e->path);
  if (!fileName.isEmpty()) {
    if (!QDir::isRelativePath(fileName))
      path = fileName;
    else
#ifdef Q_OS_UNIX
      path += '/' + fileName;
#elif defined(Q_WS_WIN)
      //current drive is passed instead of /
      path += QDir::currentPath().left(2) + '/' + fileName;
#endif
  }

  foreach(Client* c, e->m_clients)
  {
    if (c->instance==0 || c->count==0) continue;

    if (c->watchingStopped) {
      // add event to pending...
      if (event == Changed)
        c->pending |= event;
      else if (event == Created || event == Deleted)
        c->pending = event;
      continue;
    }
    // not stopped
    if (event == NoChange || event == Changed)
      event |= c->pending;
    c->pending = NoChange;
    if (event == NoChange) continue;

    if (event & Deleted) {
      c->instance->setDeleted(path);
      // emit only Deleted event...
      continue;
    }

    if (event & Created) {
      c->instance->setCreated(path);
      // possible emit Change event after creation
    }

    if (event & Changed)
      c->instance->setDirty(path);
  }
}

// Remove entries which were marked to be removed
void KDirWatchPrivate::slotRemoveDelayed()
{
  delayRemove = false;
  // Removing an entry could also take care of removing its parent
  // (e.g. in FAM or inotify mode), which would remove other entries in removeList,
  // so don't use foreach or iterators here...
  while (!removeList.isEmpty()) {
    Entry* entry = *removeList.begin();
    removeEntry(0, entry, 0); // this will remove entry from removeList
  }
}

/* Scan all entries to be watched for changes. This is done regularly
 * when polling. This is NOT used by FAM.
 */
void KDirWatchPrivate::slotRescan()
{
  EntryMap::Iterator it;

  // People can do very long things in the slot connected to dirty(),
  // like showing a message box. We don't want to keep polling during
  // that time, otherwise the value of 'delayRemove' will be reset.
  bool timerRunning = timer.isActive();
  if ( timerRunning )
    timer.stop();

  // We delay deletions of entries this way.
  // removeDir(), when called in slotDirty(), can cause a crash otherwise
  delayRemove = true;

  if (rescan_all)
  {
    // mark all as dirty
    it = m_mapEntries.begin();
    for( ; it != m_mapEntries.end(); ++it )
      (*it).dirty = true;
    rescan_all = false;
  }
  else
  {
    // progate dirty flag to dependant entries (e.g. file watches)
    it = m_mapEntries.begin();
    for( ; it != m_mapEntries.end(); ++it )
      if (((*it).m_mode == INotifyMode || (*it).m_mode == DNotifyMode) && (*it).dirty )
        (*it).propagate_dirty();
  }

#ifdef HAVE_SYS_INOTIFY_H
  QList<Entry*> dList, cList;
#endif

  it = m_mapEntries.begin();
  for( ; it != m_mapEntries.end(); ++it ) {
    // we don't check invalid entries (i.e. remove delayed)
    if (!(*it).isValid()) continue;

    int ev = scanEntry( &(*it) );

#ifdef HAVE_SYS_INOTIFY_H
    if ((*it).m_mode == INotifyMode) {
      if ( ev == Deleted ) {
        addEntry(0, QDir::cleanPath( ( *it ).path+"/.."), &*it, true);
      }
    }
    if ((*it).m_mode == INotifyMode && ev == Created && (*it).wd == 0) {
      cList.append( &(*it) );
      if (! useINotify( &(*it) )) {
        useStat( &(*it) );
      }
    }

    if ((*it).isDir)
    {
      // Report and clear the the list of files that have changed in this directory.
      // Remove duplicates by changing to set and back again:
      // we don't really care about preserving the order of the
      // original changes.
      QList<QString> pendingFileChanges = (*it).m_pendingFileChanges.toSet().toList();
      Q_FOREACH(QString changedFilename, pendingFileChanges )
      {
        emitEvent(&(*it), Changed, changedFilename);
      }
      (*it).m_pendingFileChanges.clear();
    }
#endif

    if ( ev != NoChange )
      emitEvent( &(*it), ev);
  }

  if ( timerRunning )
    timer.start(freq);

#ifdef HAVE_SYS_INOTIFY_H
  // Remove watch of parent of new created directories
  Q_FOREACH(Entry* e, cList)
    removeEntry(0, QDir::cleanPath( e->path+"/.."), e);
#endif

  QTimer::singleShot(0, this, SLOT(slotRemoveDelayed()));
}

bool KDirWatchPrivate::isNoisyFile( const char * filename )
{
  // $HOME/.X.err grows with debug output, so don't notify change
  if ( *filename == '.') {
    if (strncmp(filename, ".X.err", 6) == 0) return true;
    if (strncmp(filename, ".xsession-errors", 16) == 0) return true;
    // fontconfig updates the cache on every KDE app start
    // (inclusive kio_thumbnail slaves)
    if (strncmp(filename, ".fonts.cache", 12) == 0) return true;
  }

  return false;
}

#ifdef HAVE_FAM
void KDirWatchPrivate::famEventReceived()
{
  static FAMEvent fe;

  delayRemove = true;

  //kDebug(7001) << "Fam event received";

  while(use_fam && FAMPending(&fc)) {
    if (FAMNextEvent(&fc, &fe) == -1) {
      kWarning(7001) << "FAM connection problem, switching to polling.";
      use_fam = false;
      delete sn; sn = 0;

      // Replace all FAMMode entries with DNotify/Stat
      EntryMap::Iterator it;
      it = m_mapEntries.begin();
      for( ; it != m_mapEntries.end(); ++it )
        if ((*it).m_mode == FAMMode && (*it).m_clients.count()>0) {
#ifdef HAVE_SYS_INOTIFY_H
          if (useINotify( &(*it) )) continue;
#endif
          useStat( &(*it) );
        }
    }
    else
      checkFAMEvent(&fe);
  }

  QTimer::singleShot(0, this, SLOT(slotRemoveDelayed()));
}

void KDirWatchPrivate::checkFAMEvent(FAMEvent* fe)
{
  //kDebug(7001);

  // Don't be too verbose ;-)
  if ((fe->code == FAMExists) ||
      (fe->code == FAMEndExist) ||
      (fe->code == FAMAcknowledge)) return;

  if ( isNoisyFile( fe->filename ) )
    return;

  Entry* e = 0;
  EntryMap::Iterator it = m_mapEntries.begin();
  for( ; it != m_mapEntries.end(); ++it )
    if (FAMREQUEST_GETREQNUM(&( (*it).fr )) ==
       FAMREQUEST_GETREQNUM(&(fe->fr)) ) {
      e = &(*it);
      break;
    }

  // Entry* e = static_cast<Entry*>(fe->userdata);

#if 0 // #88538
  kDebug(7001)  << "Processing FAM event ("
                << ((fe->code == FAMChanged) ? "FAMChanged" :
                    (fe->code == FAMDeleted) ? "FAMDeleted" :
                    (fe->code == FAMStartExecuting) ? "FAMStartExecuting" :
                    (fe->code == FAMStopExecuting) ? "FAMStopExecuting" :
                    (fe->code == FAMCreated) ? "FAMCreated" :
                    (fe->code == FAMMoved) ? "FAMMoved" :
                    (fe->code == FAMAcknowledge) ? "FAMAcknowledge" :
                    (fe->code == FAMExists) ? "FAMExists" :
                    (fe->code == FAMEndExist) ? "FAMEndExist" : "Unknown Code")
                << ", " << fe->filename
                << ", Req " << FAMREQUEST_GETREQNUM(&(fe->fr)) << ")";
#endif

  if (!e) {
    // this happens e.g. for FAMAcknowledge after deleting a dir...
    //    kDebug(7001) << "No entry for FAM event ?!";
    return;
  }

  if (e->m_status == NonExistent) {
    kDebug(7001) << "FAM event for nonExistent entry " << e->path;
    return;
  }

  // Delayed handling. This rechecks changes with own stat calls.
  e->dirty = true;
  if (!rescan_timer.isActive())
    rescan_timer.start(m_PollInterval); // singleshot

  // needed FAM control actions on FAM events
  if (e->isDir)
    switch (fe->code)
    {
      case FAMDeleted:
       // file absolute: watched dir
        if (!QDir::isRelativePath(fe->filename))
        {
          // a watched directory was deleted

          e->m_status = NonExistent;
          FAMCancelMonitor(&fc, &(e->fr) ); // needed ?
          kDebug(7001)  << "Cancelled FAMReq"
                        << FAMREQUEST_GETREQNUM(&(e->fr))
                        << "for" << e->path;
          // Scan parent for a new creation
          addEntry(0, QDir::cleanPath( e->path+"/.."), e, true);
        }
        break;

      case FAMCreated: {
          // check for creation of a directory we have to watch
        QString tpath(e->path + QLatin1Char('/') + fe->filename);

        Entry* sub_entry = e->findSubEntry(tpath);
        if (sub_entry && sub_entry->isDir) {
          removeEntry(0, e, sub_entry);
          sub_entry->m_status = Normal;
          if (!useFAM(sub_entry)) {
#ifdef HAVE_SYS_INOTIFY_H
            if (!useINotify(sub_entry ))
#endif
              useStat(sub_entry);
          }
        }
        else if ((sub_entry == 0) && (!e->m_clients.empty())) {
          bool isDir = false;
          const QList<Client *> clients = e->clientsForFileOrDir(tpath, &isDir);
          Q_FOREACH(Client *client, clients) {
            addEntry (client->instance, tpath, 0, isDir,
                      isDir ? client->m_watchModes : KDirWatch::WatchDirOnly);
          }

          if (!clients.isEmpty()) {
            emitEvent(e, Created, tpath);

            QString msg (QString::number(clients.count()));
            msg += " instance/s monitoring the new ";
            msg += (isDir ? "dir " : "file ") + tpath;
            kDebug(7001) << msg;
          }
        }
      }
        break;
      default:
        break;
    }
}
#else
void KDirWatchPrivate::famEventReceived()
{
    kWarning (7001) << "Fam event received but FAM is not supported";
}
#endif


void KDirWatchPrivate::statistics()
{
  EntryMap::Iterator it;

  kDebug(7001) << "Entries watched:";
  if (m_mapEntries.count()==0) {
    kDebug(7001) << "  None.";
  }
  else {
    it = m_mapEntries.begin();
    for( ; it != m_mapEntries.end(); ++it ) {
      Entry* e = &(*it);
      kDebug(7001)  << "  " << e->path << " ("
                    << ((e->m_status==Normal)?"":"Nonexistent ")
                    << (e->isDir ? "Dir":"File") << ", using "
                    << ((e->m_mode == FAMMode) ? "FAM" :
                        (e->m_mode == INotifyMode) ? "INotify" :
                        (e->m_mode == DNotifyMode) ? "DNotify" :
                        (e->m_mode == QFSWatchMode) ? "QFSWatch" :
                        (e->m_mode == StatMode) ? "Stat" : "Unknown Method")
                    << ")";

      foreach(Client* c, e->m_clients) {
        QString pending;
        if (c->watchingStopped) {
          if (c->pending & Deleted) pending += "deleted ";
          if (c->pending & Created) pending += "created ";
          if (c->pending & Changed) pending += "changed ";
          if (!pending.isEmpty()) pending = " (pending: " + pending + ')';
          pending = ", stopped" + pending;
        }
        kDebug(7001)  << "    by " << c->instance->objectName()
                      << " (" << c->count << " times)" << pending;
      }
      if (e->m_entries.count()>0) {
        kDebug(7001) << "    dependent entries:";
        foreach(Entry *d, e->m_entries) {
          kDebug(7001) << "      " << d->path;
        }
      }
    }
  }
}

#ifdef HAVE_QFILESYSTEMWATCHER
// Slot for QFileSystemWatcher
void KDirWatchPrivate::fswEventReceived(const QString &path)
{
  EntryMap::Iterator it;
  it = m_mapEntries.find(path);
  if(it != m_mapEntries.end()) {
    Entry entry = *it;  // deep copy to not point to uninialized data (can happen inside emitEvent() )
    Entry *e = &entry;
    e->dirty = true;
    int ev = scanEntry(e);
    if (ev != NoChange)
      emitEvent(e, ev);
    if(ev == Deleted) {
      if (e->isDir)
        addEntry(0, QDir::cleanPath(e->path + "/.."), e, true);
      else
        addEntry(0, QFileInfo(e->path).absolutePath(), e, true);
    } else
    if (ev == Changed && e->isDir && e->m_entries.count()) {
      Entry* sub_entry = 0;
      Q_FOREACH(sub_entry, e->m_entries) {
        if(e->isDir) { // ####### !?!? Already checked above
          if (QFileInfo(sub_entry->path).isDir()) // ##### !? no comparison between sub_entry->path and path?
            break;
        } else {
          if (QFileInfo(sub_entry->path).isFile())
            break;
        }
      }
      if (sub_entry) {
        removeEntry(0, e, sub_entry);
        //KDE_struct_stat stat_buf;
        //QByteArray tpath = QFile::encodeName(path);
        //KDE_stat(tpath, &stat_buf);

        if(!useQFSWatch(sub_entry))
#ifdef HAVE_SYS_INOTIFY_H
          if(!useINotify(sub_entry))
#endif
            useStat(sub_entry);
        fswEventReceived(sub_entry->path);
      }
    }
  }
}
#else
void KDirWatchPrivate::fswEventReceived(const QString &path)
{
    Q_UNUSED(path);
    kWarning (7001) << "QFileSystemWatcher event received but QFileSystemWatcher is not supported";
}
#endif    // HAVE_QFILESYSTEMWATCHER

//
// Class KDirWatch
//

K_GLOBAL_STATIC(KDirWatch, s_pKDirWatchSelf)
KDirWatch* KDirWatch::self()
{
  return s_pKDirWatchSelf;
}

bool KDirWatch::exists()
{
  return s_pKDirWatchSelf != 0;
}

KDirWatch::KDirWatch (QObject* parent)
  : QObject(parent), d(createPrivate())
{
  static int nameCounter = 0;

  nameCounter++;
  setObjectName(QString("KDirWatch-%1").arg(nameCounter) );

  d->ref();

  d->_isStopped = false;
}

KDirWatch::~KDirWatch()
{
  d->removeEntries(this);
  if ( d->deref() )
  {
    // delete it if it's the last one
    delete d;
    dwp_self = 0;
  }
}

void KDirWatch::addDir( const QString& _path, WatchModes watchModes)
{
  if (d) d->addEntry(this, _path, 0, true, watchModes);
}

void KDirWatch::addFile( const QString& _path )
{
  if (d) d->addEntry(this, _path, 0, false);
}

QDateTime KDirWatch::ctime( const QString &_path ) const
{
  KDirWatchPrivate::Entry* e = d->entry(_path);

  if (!e)
    return QDateTime();

  QDateTime result;
  result.setTime_t(e->m_ctime);
  return result;
}

void KDirWatch::removeDir( const QString& _path )
{
  if (d) d->removeEntry(this, _path, 0);
}

void KDirWatch::removeFile( const QString& _path )
{
  if (d) d->removeEntry(this, _path, 0);
}

bool KDirWatch::stopDirScan( const QString& _path )
{
  if (d) {
    KDirWatchPrivate::Entry *e = d->entry(_path);
    if (e && e->isDir) return d->stopEntryScan(this, e);
  }
  return false;
}

bool KDirWatch::restartDirScan( const QString& _path )
{
  if (d) {
    KDirWatchPrivate::Entry *e = d->entry(_path);
    if (e && e->isDir)
      // restart without notifying pending events
      return d->restartEntryScan(this, e, false);
  }
  return false;
}

void KDirWatch::stopScan()
{
  if (d) {
    d->stopScan(this);
    d->_isStopped = true;
  }
}

bool KDirWatch::isStopped()
{
  return d->_isStopped;
}

void KDirWatch::startScan( bool notify, bool skippedToo )
{
  if (d) {
    d->_isStopped = false;
    d->startScan(this, notify, skippedToo);
  }
}


bool KDirWatch::contains( const QString& _path ) const
{
  KDirWatchPrivate::Entry* e = d->entry(_path);
  if (!e)
     return false;

  foreach(KDirWatchPrivate::Client* client, e->m_clients) {
    if (client->instance == this)
      return true;
  }

  return false;
}

void KDirWatch::statistics()
{
  if (!dwp_self) {
    kDebug(7001) << "KDirWatch not used";
    return;
  }
  dwp_self->statistics();
}


void KDirWatch::setCreated( const QString & _file )
{
  kDebug(7001) << objectName() << "emitting created" << _file;
  emit created( _file );
}

void KDirWatch::setDirty( const QString & _file )
{
  kDebug(7001) << objectName() << "emitting dirty" << _file;
  emit dirty( _file );
}

void KDirWatch::setDeleted( const QString & _file )
{
  kDebug(7001) << objectName() << "emitting deleted" << _file;
  emit deleted( _file );
}

KDirWatch::Method KDirWatch::internalMethod()
{
#ifdef HAVE_FAM
  if (d->use_fam)
    return KDirWatch::FAM;
#endif
#ifdef HAVE_SYS_INOTIFY_H
  if (d->supports_inotify)
    return KDirWatch::INotify;
#endif
  return KDirWatch::Stat;
}


#include "kdirwatch.moc"
#include "kdirwatch_p.moc"

//sven

// vim: sw=2 ts=8 et

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