Fixed kdirwatch

1 files changed, 2 insertions, 1 deletions

diff --git a/microkde/kio/kio/kdirwatch.cpp b/microkde/kio/kio/kdirwatch.cpp
index 98d24e0..1596d1f 100644
--- a/microkde/kio/kio/kdirwatch.cpp
+++ b/microkde/kio/kio/kdirwatch.cpp
@@ -1,1442 +1,1443 @@
 // -*- c-basic-offset: 2 -*-
 /* This file is part of the KDE libraries
    Copyright (C) 1998 Sven Radej <sven@lisa.exp.univie.ac.at>
 
    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., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
 */
 
 /*
 Enhanced Version of the file for platform independent KDE tools.
 Copyright (c) 2004 Ulf Schenk
 
 $Id$
 */
 
 
 // CHANGES:
 // 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)
 
 
 //US #include <config.h>
 
 #ifdef HAVE_DNOTIFY
 #include <unistd.h>
 #include <time.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <errno.h>
 #endif
 
 #include <sys/stat.h>
 #include <assert.h>
 #include <qdir.h>
 #include <qfile.h>
 #include <qintdict.h>
 #include <qptrlist.h>
 #include <qsocketnotifier.h>
 #include <qstringlist.h>
 #include <qtimer.h>
 
 #include <kapplication.h>
 #include <kdebug.h>
 #include <kconfig.h>
 #include <kconfigbase.h>
 #include <kglobal.h>
 #include <kstaticdeleter.h>
 
 #include "kdirwatch.h"
 #include "kdirwatch_p.h"
 //US #include "global.h" //  KIO::probably_slow_mounted
 
 #define NO_NOTIFY (time_t) 0
 
 static KDirWatchPrivate* dwp_self = 0;
 
 #ifdef HAVE_DNOTIFY
 
 #include <sys/utsname.h>
 
 static int dnotify_signal = 0;
 
 /* DNOTIFY signal handler
  *
  * As this is called asynchronously, only a flag is set and
  * a rescan is requested.
  * This is done by writing into a pipe to trigger a QSocketNotifier
  * watching on this pipe: a timer is started and after a timeout,
  * the rescan is done.
  */
 void KDirWatchPrivate::dnotify_handler(int, siginfo_t *si, void *)
 {
   // write might change errno, we have to save it and restore it
   // (Richard Stevens, Advanced programming in the Unix Environment)
   int saved_errno = errno;
 
   Entry* e = (dwp_self) ? dwp_self->fd_Entry.find(si->si_fd) :0;
 
 //  kdDebug(7001) << "DNOTIFY Handler: fd " << si->si_fd << " path "
         //      << QString(e ? e->path:"unknown") << endl;
 
   if(!e || e->dn_fd != si->si_fd) {
     qDebug("fatal error in KDirWatch");
   } else
     e->dn_dirty = true;
 
   char c = 0;
   write(dwp_self->mPipe[1], &c, 1);
   errno = saved_errno;
 }
 
 static struct sigaction old_sigio_act;
 /* DNOTIFY SIGIO signal handler
  *
  * When the kernel queue for the dnotify_signal overflows, a SIGIO is send.
  */
 void KDirWatchPrivate::dnotify_sigio_handler(int sig, siginfo_t *si, void *p)
 {
   // write might change errno, we have to save it and restore it
   // (Richard Stevens, Advanced programming in the Unix Environment)
   int saved_errno = errno;
 
   if (dwp_self) 
     dwp_self->rescan_all = true;
 
   char c = 0;
   write(dwp_self->mPipe[1], &c, 1);
 
   errno = saved_errno;
   
   // Call previous signal handler
   if (old_sigio_act.sa_flags & SA_SIGINFO)
   {
     if (old_sigio_act.sa_sigaction)
       (*old_sigio_act.sa_sigaction)(sig, si, p);
   }
   else
   {
     if ((old_sigio_act.sa_handler != SIG_DFL) &&
         (old_sigio_act.sa_handler != SIG_IGN))
       (*old_sigio_act.sa_handler)(sig);
   }
 }
 #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.
  * - DNOTIFY: In late LINUX 2.3.x, directory notification was
  *   introduced. By opening a directory, you can request for
  *   UNIX signals to be sent to the process when a directory
  *   is changed.
  */
 
 KDirWatchPrivate::KDirWatchPrivate()
 {
   timer = new QTimer(this);
   connect (timer, SIGNAL(timeout()), this, SLOT(slotRescan()));
   freq = 3600000; // 1 hour as upper bound
   statEntries = 0;
   delayRemove = false;
   m_ref = 0;
 
 //US  KConfigGroup config(KGlobal::config(), QCString("DirWatch"));
 //US  m_nfsPollInterval = config.readNumEntry("NFSPollInterval", 5000);
 //US  m_PollInterval = config.readNumEntry("PollInterval", 500);
   KConfig *config = KGlobal::config();
   KConfigGroupSaver saver( config, QCString("DirWatch") );
   
   m_nfsPollInterval = config->readNumEntry("NFSPollInterval", 5000);
   m_PollInterval = config->readNumEntry("PollInterval", 500);
   
 
   QString available("Stat");
 
 #ifdef HAVE_FAM
   // It's possible that FAM server can't be started
   if (FAMOpen(&fc) ==0) {
     available += ", FAM";
     use_fam=true;
     sn = new QSocketNotifier( FAMCONNECTION_GETFD(&fc),
                               QSocketNotifier::Read, this);
     connect( sn, SIGNAL(activated(int)),
               this, SLOT(famEventReceived()) );
   }
   else {
     kdDebug(7001) << "Can't use FAM (fam daemon not running?)" << endl;
     use_fam=false;
   }
 #endif
 
 #ifdef HAVE_DNOTIFY
   supports_dnotify = true; // not guilty until proven guilty
   rescan_all = false;
   struct utsname uts;
   int major, minor, patch;
   if (uname(&uts) < 0)
     supports_dnotify = false; // *shrug*
   else if (sscanf(uts.release, "%d.%d.%d", &major, &minor, &patch) != 3)
     supports_dnotify = false; // *shrug*
   else if( major * 1000000 + minor * 1000 + patch < 2004019 ) { // <2.4.19
     kdDebug(7001) << "Can't use DNotify, Linux kernel too old" << endl;
     supports_dnotify = false; 
   }
 
   if( supports_dnotify ) {
     available += ", DNotify";
 
     pipe(mPipe);
     fcntl(mPipe[0], F_SETFD, FD_CLOEXEC);
     fcntl(mPipe[1], F_SETFD, FD_CLOEXEC);
     mSn = new QSocketNotifier( mPipe[0], QSocketNotifier::Read, this);
     connect(mSn, SIGNAL(activated(int)), this, SLOT(slotActivated()));
     connect(&mTimer, SIGNAL(timeout()), this, SLOT(slotRescan()));
     struct sigaction act;
     act.sa_sigaction = KDirWatchPrivate::dnotify_handler;
     sigemptyset(&act.sa_mask);
     act.sa_flags = SA_SIGINFO;
 #ifdef SA_RESTART
     act.sa_flags |= SA_RESTART;
 #endif
     if( dnotify_signal == 0 )
         dnotify_signal = SIGRTMIN + 8;
     sigaction(dnotify_signal, &act, NULL);
     
     act.sa_sigaction = KDirWatchPrivate::dnotify_sigio_handler;
     sigaction(SIGIO, &act, &old_sigio_act);
   }
 #endif
 
   kdDebug(7001) << "Available methods: " << available << endl;
 }
 
 /* This should never be called, but doesn't harm */
 KDirWatchPrivate::~KDirWatchPrivate()
 {
   timer->stop();
 
   /* remove all entries being watched */
   removeEntries(0);
 
 #ifdef HAVE_FAM
   if (use_fam) {
     FAMClose(&fc);
     kdDebug(7001) << "KDirWatch deleted (FAM closed)" << endl;
   }
 #endif
 
 }
 
 #ifdef HAVE_DNOTIFY
 void KDirWatchPrivate::slotActivated()
 {
    char dummy_buf[100];
    read(mPipe[0], &dummy_buf, 100);
 
    if (!mTimer.isActive())
       mTimer.start(200, true);
 }
 
 /* In DNOTIFY mode, only entries which are marked dirty are scanned.
  * We first need to mark all yet nonexistant, but possible created
  * entries as dirty...
  */
 void KDirWatchPrivate::Entry::propagate_dirty()
 {
   Entry* sub_entry;
   for(sub_entry = m_entries.first(); sub_entry; sub_entry = m_entries.next())
   {
      if (!sub_entry->dn_dirty)
      {
         sub_entry->dn_dirty = true;
         sub_entry->propagate_dirty();
      }
   }
 }
 
 #else // !HAVE_DNOTIFY
 // slots always have to be defined...
 void KDirWatchPrivate::slotActivated() {}
 #endif
 
 /* A KDirWatch instance is interested in getting events for
  * this file/Dir entry.
  */
 void KDirWatchPrivate::Entry::addClient(KDirWatch* instance)
 {
   Client* client = m_clients.first();
   for(;client; client = m_clients.next())
     if (client->instance == instance) break;
 
   if (client) {
     client->count++;
     return;
   }
 
   client = new Client;
   client->instance = instance;
   client->count = 1;
   client->watchingStopped = instance->isStopped();
   client->pending = NoChange;
 
   m_clients.append(client);
 }
 
 void KDirWatchPrivate::Entry::removeClient(KDirWatch* instance)
 {
   Client* client = m_clients.first();
   for(;client; client = m_clients.next())
     if (client->instance == instance) break;
 
   if (client) {
     client->count--;
     if (client->count == 0) {
       m_clients.removeRef(client);
       delete client;
     }
   }
 }
 
 /* get number of clients */
 int KDirWatchPrivate::Entry::clients()
 {
   int clients = 0;
   Client* client = m_clients.first();
   for(;client; client = m_clients.next())
     clients += client->count;
 
   return clients;
 }
 
 
 KDirWatchPrivate::Entry* KDirWatchPrivate::entry(const QString& _path)
 {
 // we only support absolute paths
   if (_path.left(1) != "/") {
     return 0;
   }
 
   QString path = _path;
 
   if ( path.length() > 1 && path.right(1) == "/" )
     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->changeInterval(freq);
     kdDebug(7001) << "Global Poll Freq is now " << freq << " msec" << endl;
   }
 }
 
 
 #if defined(HAVE_FAM)
 // setup FAM notification, returns false if not possible
 bool KDirWatchPrivate::useFAM(Entry* e)
 {
   if (!use_fam) return false;
 
   e->m_mode = FAMMode;
 
   if (e->isDir) {
     if (e->m_status == NonExistent) {
       // If the directory does not exist we watch the parent directory
       addEntry(0, QDir::cleanDirPath(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;
         return false;
       }
       kdDebug(7001) << " Setup FAM (Req "
                     << FAMREQUEST_GETREQNUM(&(e->fr))
                     << ") for " << e->path << endl;
     }
   }
   else {
     if (e->m_status == NonExistent) {
       // If the file does not exist we watch the directory
       addEntry(0, QFileInfo(e->path).dirPath(true), e, true);
     }
     else {
       int res = FAMMonitorFile(&fc, QFile::encodeName(e->path),
                                &(e->fr), e);
       if (res<0) {
         e->m_mode = UnknownMode;
         use_fam=false;
         return false;
       }
 
       kdDebug(7001) << " Setup FAM (Req "
                     << FAMREQUEST_GETREQNUM(&(e->fr))
                     << ") for " << e->path << endl;
     }
   }
 
   // handle FAM events to avoid deadlock
   // (FAM sends back all files in a directory when monitoring)
   famEventReceived();
 
   return true;
 }
 #endif
 
 
 #ifdef HAVE_DNOTIFY
 // setup DNotify notification, returns false if not possible
 bool KDirWatchPrivate::useDNotify(Entry* e)
 {
   e->dn_fd = 0;
   if (!supports_dnotify) return false;
 
   e->m_mode = DNotifyMode;
 
   if (e->isDir) {
     e->dn_dirty = false;
     if (e->m_status == Normal) {
       int fd = open(QFile::encodeName(e->path).data(), O_RDONLY);
       // Migrate fd to somewhere above 128. Some libraries have 
       // constructs like:
       //    fd = socket(...)
       //    if (fd > ARBITRARY_LIMIT)
       //       return error;
       //
       // Since programs might end up using a lot of KDirWatch objects 
       // for a rather long time the above braindamage could get
       // triggered.
       // 
       // By moving the kdirwatch fd's to > 128, calls like socket() will keep
       // returning fd's < ARBITRARY_LIMIT for a bit longer.
       int fd2 = fcntl(fd, F_DUPFD, 128);
       if (fd2 >= 0)
       {
         close(fd);
         fd = fd2;
       }
       if (fd<0) {
         e->m_mode = UnknownMode;
         return false;
       }
 
       int mask = DN_DELETE|DN_CREATE|DN_RENAME|DN_MULTISHOT;
       // if dependant is a file watch, we check for MODIFY & ATTRIB too
       for(Entry* dep=e->m_entries.first();dep;dep=e->m_entries.next())
         if (!dep->isDir) { mask |= DN_MODIFY|DN_ATTRIB; break; }
 
       if(fcntl(fd, F_SETSIG, dnotify_signal) < 0 ||
          fcntl(fd, F_NOTIFY, mask) < 0) {
 
         kdDebug(7001) << "Not using Linux Directory Notifications."
                       << endl;
         supports_dnotify = false;
         ::close(fd);
         e->m_mode = UnknownMode;
         return false;
       }
 
       fd_Entry.replace(fd, e);
       e->dn_fd = fd;
 
       kdDebug(7001) << " Setup DNotify (fd " << fd
                     << ") for " << e->path << endl;
     }
     else { // NotExisting
       addEntry(0, QDir::cleanDirPath(e->path+"/.."), e, true);
     }
   }
   else { // File
     // we always watch the directory (DNOTIFY can't watch files alone)
     // this notifies us about changes of files therein
     addEntry(0, QFileInfo(e->path).dirPath(true), e, true);
   }
 
   return true;
 }
 #endif
 
 
 bool KDirWatchPrivate::useStat(Entry* e)
 {
 //US we have no KIO::probably_slow_mounted. So disable this part
 //US  if (KIO::probably_slow_mounted(e->path))
 //US    useFreq(e, m_nfsPollInterval);
 //US  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
       kdDebug(7001) << " Started Polling Timer, freq " << freq << endl;
     }
   }
 
   kdDebug(7001) << " Setup Stat (freq " << e->freq
                 << ") for " << e->path << endl;
 
   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)
 {
   QString path = _path;
   if (path.startsWith("/dev/") || (path == "/dev"))
     return; // Don't even go there.
 
   if ( path.length() > 1 && path.right(1) == "/" )
     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);
        kdDebug(7001) << "Added already watched Entry " << path
                      << " (for " << sub_entry->path << ")" << endl;
 #ifdef HAVE_DNOTIFY
        Entry* e = &(*it);
        if( e->dn_fd > 0 ) {
          int mask = DN_DELETE|DN_CREATE|DN_RENAME|DN_MULTISHOT;
          // if dependant is a file watch, we check for MODIFY & ATTRIB too
          for(Entry* dep=e->m_entries.first();dep;dep=e->m_entries.next())
                 if (!dep->isDir) { mask |= DN_MODIFY|DN_ATTRIB; break; }
          if( fcntl(e->dn_fd, F_NOTIFY, mask) < 0) { // shouldn't happen
            ::close(e->dn_fd);
            e->m_mode = UnknownMode;
              fd_Entry.remove(e->dn_fd);
            e->dn_fd = 0;
            useStat( e );
          }
        }
 #endif
     }
     else {
        (*it).addClient(instance);
        kdDebug(7001) << "Added already watched Entry " << path
                      << " (now " <<  (*it).clients() << " clients)"
                      << QString(" [%1]").arg(instance->name()) << endl;
     }
     return;
   }
 
   // we have a new path to watch
 
   struct stat stat_buf;
   bool exists = (stat(QFile::encodeName(path), &stat_buf) == 0);
 
   Entry newEntry;
   m_mapEntries.insert( path, newEntry );
   // the insert does a copy, so we have to use <e> now
   Entry* e = &(m_mapEntries[path]);
 
   if (exists) {
-    e->isDir = S_ISDIR(stat_buf.st_mode);
+    QFileInfo fi ( path );
+    e->isDir = fi.isDir();
 
     if (e->isDir && !isDir)
       qWarning("KDirWatch: %s is a directory. Use addDir!", path.ascii());
     else if (!e->isDir && isDir)
       qWarning("KDirWatch: %s is a file. Use addFile!", path.ascii());
 
     e->m_ctime = stat_buf.st_ctime;
     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);
 
   kdDebug(7001) << "Added " << (e->isDir ? "Dir ":"File ") << path
                 << (e->m_status == NonExistent ? " NotExisting" : "")
                 << (sub_entry ? QString(" for %1").arg(sub_entry->path) : QString(""))
                 << (instance ? QString(" [%1]").arg(instance->name()) : QString(""))
                 << endl;
 
 
   // now setup the notification method
   e->m_mode = UnknownMode;
   e->msecLeft = 0;
 
 #if defined(HAVE_FAM)
   if (useFAM(e)) return;
 #endif
 
 #ifdef HAVE_DNOTIFY
   if (useDNotify(e)) return;
 #endif
 
   useStat(e);
 }
 
 
 void KDirWatchPrivate::removeEntry( KDirWatch* instance,
                                     const QString& _path, Entry* sub_entry )
 {
   Entry* e = entry(_path);
   if (!e) {
     kdWarning(7001) << "KDirWatch::removeDir can't handle '" << _path << "'" << endl;
     return;
   }
 
   if (sub_entry)
     e->m_entries.removeRef(sub_entry);
   else
     e->removeClient(instance);
 
   if (e->m_clients.count() || e->m_entries.count())
     return;
 
   if (delayRemove) {
     // removeList is allowed to contain any entry at most once
     if (removeList.findRef(e)==-1)
     removeList.append(e);
     // now e->isValid() is false
     return;
   }
 
 #ifdef HAVE_FAM
   if (e->m_mode == FAMMode) {
     if ( e->m_status == Normal) {
       FAMCancelMonitor(&fc, &(e->fr) );
       kdDebug(7001) << "Cancelled FAM (Req "
                     << FAMREQUEST_GETREQNUM(&(e->fr))
                     << ") for " << e->path << endl;
     }
     else {
       if (e->isDir)
         removeEntry(0, QDir::cleanDirPath(e->path+"/.."), e);
       else
         removeEntry(0, QFileInfo(e->path).dirPath(true), e);
     }
   }
 #endif
 
 #ifdef HAVE_DNOTIFY
   if (e->m_mode == DNotifyMode) {
     if (!e->isDir) {
       removeEntry(0, QFileInfo(e->path).dirPath(true), e);
     }
     else { // isDir
       // must close the FD.
       if ( e->m_status == Normal) {
         if (e->dn_fd) {
           ::close(e->dn_fd);
           fd_Entry.remove(e->dn_fd);
 
           kdDebug(7001) << "Cancelled DNotify (fd " << e->dn_fd
                         << ") for " << e->path << endl;
           e->dn_fd = 0;
 
         }
       }
       else {
         removeEntry(0, QDir::cleanDirPath(e->path+"/.."), e);
       }
     }
   }
 #endif
 
   if (e->m_mode == StatMode) {
     statEntries--;
     if ( statEntries == 0 ) {
       timer->stop(); // stop timer if lists are empty
       kdDebug(7001) << " Stopped Polling Timer" << endl;
     }
   }
 
   kdDebug(7001) << "Removed " << (e->isDir ? "Dir ":"File ") << e->path
                 << (sub_entry ? QString(" for %1").arg(sub_entry->path) : QString(""))
                 << (instance ? QString(" [%1]").arg(instance->name()) : QString(""))
                 << endl;
   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 )
 {
   QPtrList<Entry> list;
   int minfreq = 3600000;
 
   // put all entries where instance is a client in list
   EntryMap::Iterator it = m_mapEntries.begin();
   for( ; it != m_mapEntries.end(); ++it ) {
     Client* c = (*it).m_clients.first();
     for(;c;c=(*it).m_clients.next())
       if (c->instance == instance) break;
     if (c) {
       c->count = 1; // forces deletion of instance as client
       list.append(&(*it));
     }
     else if ( (*it).m_mode == StatMode && (*it).freq < minfreq )
       minfreq = (*it).freq;
   }
 
   for(Entry* e=list.first();e;e=list.next())
     removeEntry(instance, e->path, 0);
 
   if (minfreq > freq) {
     // we can decrease the global polling frequency
     freq = minfreq;
     if (timer->isActive()) timer->changeInterval(freq);
     kdDebug(7001) << "Poll Freq now " << freq << " msec" << endl;
   }
 }
 
 // instance ==0: stop scanning for all instances
 bool KDirWatchPrivate::stopEntryScan( KDirWatch* instance, Entry* e)
 {
   int stillWatching = 0;
   Client* c = e->m_clients.first();
   for(;c;c=e->m_clients.next()) {
     if (!instance || instance == c->instance)
       c->watchingStopped = true;
     else if (!c->watchingStopped)
       stillWatching += c->count;
   }
 
   kdDebug(7001) << instance->name() << " stopped scanning " << e->path
                 << " (now " << stillWatching << " watchers)" << endl;
 
   if (stillWatching == 0) {
     // if nobody is interested, we don't watch
     e->m_ctime = invalid_ctime; // invalid
     //    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;
   Client* c = e->m_clients.first();
   for(;c;c=e->m_clients.next()) {
     if (!c->watchingStopped)
       wasWatching += c->count;
     else if (!instance || instance == c->instance) {
       c->watchingStopped = false;
       newWatching += c->count;
     }
   }
   if (newWatching == 0)
     return false;
 
   kdDebug(7001) << instance->name() << " restarted scanning " << e->path
                 << " (now " << wasWatching+newWatching << " watchers)" << endl;
 
   // restart watching and emit pending events
 
   int ev = NoChange;
   if (wasWatching == 0) {
     if (!notify) {
       struct stat stat_buf;
       bool exists = (stat(QFile::encodeName(e->path), &stat_buf) == 0);
       if (exists) {
         e->m_ctime = stat_buf.st_ctime;
         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 ) {
 
     Client* c = (*it).m_clients.first();
     for(;c;c=(*it).m_clients.next())
       if (!c->watchingStopped || skippedToo)
         c->pending = NoChange;
   }
 }
 
 // Return event happened on <e>
 //
 int KDirWatchPrivate::scanEntry(Entry* e)
 {
 #ifdef HAVE_FAM
   // we do not stat entries using FAM
   if (e->m_mode == FAMMode) return NoChange;
 #endif
 
   // Shouldn't happen: Ignore "unknown" notification method
   if (e->m_mode == UnknownMode) return NoChange;
 
 #ifdef HAVE_DNOTIFY
   if (e->m_mode == DNotifyMode) {
     // we know nothing has changed, no need to stat
     if(!e->dn_dirty) return NoChange;
     e->dn_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;
   }
 
   struct stat stat_buf;
   bool exists = (stat(QFile::encodeName(e->path), &stat_buf) == 0);
   if (exists) {
 
     if (e->m_status == NonExistent) {
       e->m_ctime = stat_buf.st_ctime;
       e->m_status = Normal;
       e->m_nlink = stat_buf.st_nlink;
       return Created;
     }
 
     if ( (e->m_ctime != invalid_ctime) && 
          ((stat_buf.st_ctime != e->m_ctime) || 
         //  (stat_buf.st_nlink != (nlink_t) e->m_nlink)) ) {
           (stat_buf.st_nlink != e->m_nlink)) ) {
       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)
     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(Entry* e, int event, const QString &fileName)
 {
   QString path = e->path;
   if (!fileName.isEmpty()) {
     if (fileName[0] == '/')
       path = fileName;
     else
       path += "/" + fileName;
   }
 
   Client* c = e->m_clients.first();
   for(;c;c=e->m_clients.next()) {
     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()
 {
   Entry* e;
   delayRemove = false;
   for(e=removeList.first();e;e=removeList.next())
     removeEntry(0, e->path, 0);
   removeList.clear();
 }
 
 /* Scan all entries to be watched for changes. This is done regularly
  * when polling and once after a DNOTIFY signal. 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;
 
 #ifdef HAVE_DNOTIFY
   QPtrList<Entry> dList, cList;
 
   // for DNotify method,
   if (rescan_all)
   {
     // mark all as dirty
     it = m_mapEntries.begin();
     for( ; it != m_mapEntries.end(); ++it )
       (*it).dn_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 == DNotifyMode) && (*it).dn_dirty )
         (*it).propagate_dirty();
   }
 
 #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_DNOTIFY
     if ((*it).m_mode == DNotifyMode) {
       if ((*it).isDir && (ev == Deleted)) {
         dList.append( &(*it) );
 
         // must close the FD.
         if ((*it).dn_fd) {
           ::close((*it).dn_fd);
           fd_Entry.remove((*it).dn_fd);
           (*it).dn_fd = 0;
         }
       }
 
       else if ((*it).isDir && (ev == Created)) {
         // For created, but yet without DNOTIFYing ...
         if ( (*it).dn_fd == 0) {
           cList.append( &(*it) );
           if (! useDNotify( &(*it) )) {
             // if DNotify setup fails...
             useStat( &(*it) );
           }
         }
       }
     }
 #endif
 
     if ( ev != NoChange )
       emitEvent( &(*it), ev);
   }
 
 
 #ifdef HAVE_DNOTIFY
   // Scan parent of deleted directories for new creation
   Entry* e;
   for(e=dList.first();e;e=dList.next())
     addEntry(0, QDir::cleanDirPath( e->path+"/.."), e, true);
 
   // Remove watch of parent of new created directories
   for(e=cList.first();e;e=cList.next())
     removeEntry(0, QDir::cleanDirPath( e->path+"/.."), e);
 #endif
 
   if ( timerRunning )
     timer->start(freq);
 
   QTimer::singleShot(0, this, SLOT(slotRemoveDelayed()));
 }
 
 #ifdef HAVE_FAM
 void KDirWatchPrivate::famEventReceived()
 {
   static FAMEvent fe;
 
   delayRemove = true;
 
   while(use_fam && FAMPending(&fc)) {
     if (FAMNextEvent(&fc, &fe) == -1) {
       kdWarning(7001) << "FAM connection problem, switching to polling."
                       << endl;
       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_DNOTIFY
           if (useDNotify( &(*it) )) continue;
 #endif
           useStat( &(*it) );
         }
     }
     else
       checkFAMEvent(&fe);
   }
 
   QTimer::singleShot(0, this, SLOT(slotRemoveDelayed()));
 }
 
 void KDirWatchPrivate::checkFAMEvent(FAMEvent* fe)
 {
   // Don't be too verbose ;-)
   if ((fe->code == FAMExists) ||
       (fe->code == FAMEndExist) ||
       (fe->code == FAMAcknowledge)) return;
 
   // $HOME/.X.err grows with debug output, so don't notify change
   if ( *(fe->filename) == '.') {
     if (strncmp(fe->filename, ".X.err", 6) == 0) return;
     if (strncmp(fe->filename, ".xsession-errors", 16) == 0) 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);
 
   kdDebug(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))
                 << ")" << endl;
 
   if (!e) {
     // this happens e.g. for FAMAcknowledge after deleting a dir...
     //    kdDebug(7001) << "No entry for FAM event ?!" << endl;
     return;
   }
 
   if (e->m_status == NonExistent) {
     kdDebug(7001) << "FAM event for nonExistent entry " << e->path << endl;
     return;
   }
 
   if (e->isDir)
     switch (fe->code)
     {
       case FAMDeleted:
        // file absolute: watched dir
         if (fe->filename[0] == '/')
         {
           // a watched directory was deleted
 
           e->m_status = NonExistent;
           FAMCancelMonitor(&fc, &(e->fr) ); // needed ?
           kdDebug(7001) << "Cancelled FAMReq "
                         << FAMREQUEST_GETREQNUM(&(e->fr))
                         << " for " << e->path << endl;
           // Scan parent for a new creation
           addEntry(0, QDir::cleanDirPath( e->path+"/.."), e, true);
         }
         emitEvent(e, Deleted, QFile::decodeName(fe->filename));
         break;
 
       case FAMCreated: {
           // check for creation of a directory we have to watch
           Entry *sub_entry = e->m_entries.first();
           for(;sub_entry; sub_entry = e->m_entries.next())
             if (sub_entry->path == e->path + "/" + fe->filename) break;
           if (sub_entry && sub_entry->isDir) {
             QString path = e->path;
             removeEntry(0,e->path,sub_entry); // <e> can be invalid here!!
             sub_entry->m_status = Normal;
             if (!useFAM(sub_entry))
               useStat(sub_entry);
 
             emitEvent(sub_entry, Created);
           }
           else emitEvent(e, Created, QFile::decodeName(fe->filename));
           break;
         }
 
       case FAMChanged:
         emitEvent(e, Changed, QFile::decodeName(fe->filename));
 
       default:
         break;
     }
   else switch (fe->code)
     {
       case FAMCreated: emitEvent(e, Created);
                        break;
       case FAMDeleted: emitEvent(e, Deleted);
                        break;
       case FAMChanged: emitEvent(e, Changed);
                        break;
       default: break;
     }
 }
 #else
 void KDirWatchPrivate::famEventReceived() {}
 #endif
 
 
 void KDirWatchPrivate::statistics()
 {
   EntryMap::Iterator it;
 
   kdDebug(7001) << "Entries watched:" << endl;
   if (m_mapEntries.count()==0) {
     kdDebug(7001) << "  None." << endl;
   }
   else {
     it = m_mapEntries.begin();
     for( ; it != m_mapEntries.end(); ++it ) {
       Entry* e = &(*it);
       kdDebug(7001) << "  " << e->path << " ("
                     << ((e->m_status==Normal)?"":"Nonexistent ")
                     << (e->isDir ? "Dir":"File") << ", using "
                     << ((e->m_mode == FAMMode) ? "FAM" :
                         (e->m_mode == DNotifyMode) ? "DNotify" :
                         (e->m_mode == StatMode) ? "Stat" : "Unknown Method")
                     << ")" << endl;
 
       Client* c = e->m_clients.first();
       for(;c; c = e->m_clients.next()) {
         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;
         }
         kdDebug(7001) << "    by " << c->instance->name()
                       << " (" << c->count << " times)"
                       << pending << endl;
       }
       if (e->m_entries.count()>0) {
         kdDebug(7001) << "    dependent entries:" << endl;
         Entry* d = e->m_entries.first();
         for(;d; d = e->m_entries.next()) {
           kdDebug(7001) << "      " << d->path << endl;
         }
       }
     }
   }
 }
 
 
 //
 // Class KDirWatch
 //
 
 static KStaticDeleter<KDirWatch> sd_dw;
 KDirWatch* KDirWatch::s_pSelf = 0L;
 
 KDirWatch* KDirWatch::self()
 {
   if ( !s_pSelf ) {
 //US    sd_dw.setObject( s_pSelf, new KDirWatch );
     s_pSelf = sd_dw.setObject( new KDirWatch );
   }
 
   return s_pSelf;
 }
 
 bool KDirWatch::exists()
 {
   return s_pSelf != 0;
 }
 
 KDirWatch::KDirWatch (QObject* parent, const char* name)
   : QObject(parent,name)
 {
   if (!name) {
     static int nameCounter = 0;
 
     nameCounter++;
     setName(QString("KDirWatch-%1").arg(nameCounter).ascii());
   }
 
   if (!dwp_self)
     dwp_self = new KDirWatchPrivate;
   d = dwp_self;
   d->ref();
 
   _isStopped = false;
 }
 
 KDirWatch::~KDirWatch()
 {
   if (d) d->removeEntries(this);
   if ( d->deref() )
   {
     // delete it if it's the last one
     delete d;
     dwp_self = 0L;
   }
 }
 
 
 // TODO: add watchFiles/recursive support
 void KDirWatch::addDir( const QString& _path,
                         bool watchFiles, bool recursive)
 {
   if (watchFiles || recursive) {
     kdDebug(7001) << "addDir - recursive/watchFiles not supported in KDE 3.0"
                   << endl;
   }
   if (d) d->addEntry(this, _path, 0, true);
 }
 
 void KDirWatch::addFile( const QString& _path )
 {
   if (d) d->addEntry(this, _path, 0, false);
 }
 
 QDateTime KDirWatch::ctime( const QString &_path )
 {
   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);
   _isStopped = true;
 }
 
 void KDirWatch::startScan( bool notify, bool skippedToo )
 {
   _isStopped = false;
   if (d) d->startScan(this, notify, skippedToo);
 }
 
 
 bool KDirWatch::contains( const QString& _path ) const
 {
   KDirWatchPrivate::Entry* e = d->entry(_path);
   if (!e)
      return false;
 
   KDirWatchPrivate::Client* c = e->m_clients.first();
   for(;c;c=e->m_clients.next())
     if (c->instance == this) return true;
 
   return false;
 }
 
 void KDirWatch::statistics()
 {
   if (!dwp_self) {
     kdDebug(7001) << "KDirWatch not used" << endl;
     return;
   }
   dwp_self->statistics();
 }
 
 
 void KDirWatch::setCreated( const QString & _file )
 {
   kdDebug(7001) << name() << " emitting created " << _file << endl;
   emit created( _file );
 }
 
 void KDirWatch::setDirty( const QString & _file )
 {
   kdDebug(7001) << name() << " emitting dirty " << _file << endl;
   emit dirty( _file );
 }
 
 void KDirWatch::setDeleted( const QString & _file )
 {
   kdDebug(7001) << name() << " emitting deleted " << _file << endl;
   emit deleted( _file );
 }
 
 //US #include "kdirwatch.moc"
 //US #include "kdirwatch_p.moc"
 
 //sven
 
 // vim: sw=2 ts=8 et