summaryrefslogtreecommitdiffstats
path: root/src/dbus/qdbusconnection.cpp
blob: f68a8caabaab58e424f4003d1f8f0d2e78b207cf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDBus module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <qdebug.h>
#include <qcoreapplication.h>
#include <qstringlist.h>

#include "qdbusconnection.h"
#include "qdbusconnectioninterface.h"
#include "qdbuserror.h"
#include "qdbusmessage.h"
#include "qdbusmessage_p.h"
#include "qdbusconnection_p.h"
#include "qdbusinterface_p.h"
#include "qdbusutil_p.h"

#include "qdbusthreaddebug_p.h"

#ifndef QT_NO_DBUS

QT_BEGIN_NAMESPACE

class QDBusConnectionManager
{
public:
    QDBusConnectionManager() {}
    ~QDBusConnectionManager();

    QDBusConnectionPrivate *connection(const QString &name) const;
    void removeConnection(const QString &name);
    void setConnection(const QString &name, QDBusConnectionPrivate *c);

    QDBusConnectionPrivate *sender() const;
    void setSender(const QDBusConnectionPrivate *s);

    mutable QMutex mutex;
private:
    QHash<QString, QDBusConnectionPrivate *> connectionHash;

    mutable QMutex senderMutex;
    QString senderName; // internal; will probably change
};

Q_GLOBAL_STATIC(QDBusConnectionManager, _q_manager)

QDBusConnectionPrivate *QDBusConnectionManager::sender() const
{
    QMutexLocker locker(&senderMutex);
    return connection(senderName);
}

void QDBusConnectionManager::setSender(const QDBusConnectionPrivate *s)
{
    QMutexLocker locker(&senderMutex);
    senderName = (s ? s->name : QString());
}

QDBusConnectionPrivate *QDBusConnectionManager::connection(const QString &name) const
{
    return connectionHash.value(name, 0);
}

void QDBusConnectionManager::removeConnection(const QString &name)
{
    QDBusConnectionPrivate *d = 0;
    d = connectionHash.take(name);
    if (d && !d->ref.deref())
        d->deleteYourself();

    // Static objects may be keeping the connection open.
    // However, it is harmless to have outstanding references to a connection that is
    // closing as long as those references will be soon dropped without being used.

    // ### Output a warning if connections are being used after they have been removed.
}

QDBusConnectionManager::~QDBusConnectionManager()
{
    for (QHash<QString, QDBusConnectionPrivate *>::const_iterator it = connectionHash.constBegin();
         it != connectionHash.constEnd(); ++it) {
        QDBusConnectionPrivate *d = it.value();
        if (!d->ref.deref())
            d->deleteYourself();
        else
            d->closeConnection();
    }
    connectionHash.clear();
}

Q_DBUS_EXPORT void qDBusBindToApplication();
void qDBusBindToApplication()
{
}

void QDBusConnectionManager::setConnection(const QString &name, QDBusConnectionPrivate *c)
{
    connectionHash[name] = c;
    c->name = name;
}

/*!
    \fn QDBusConnection &QDBusConnection::sessionBus()
    \relates QDBusConnection

    Returns a QDBusConnection object opened with the session bus. The object
    reference returned by this function is valid until the application terminates,
    at which point the connection will be closed and the object deleted.
*/
/*!
    \fn QDBusConnection &QDBusConnection::systemBus()
    \relates QDBusConnection

    Returns a QDBusConnection object opened with the system bus. The object reference returned
    by this function is valid until the QCoreApplication's destructor is run, when the
    connection will be closed and the object, deleted.
*/

/*!
    \class QDBusConnection
    \inmodule QtDBus
    \since 4.2

    \brief The QDBusConnection class represents a connection to the D-Bus bus daemon.

    This class is the initial point in a D-Bus session. Using it, you
    can get access to remote objects, interfaces; connect remote
    signals to your object's slots; register objects, etc.

    D-Bus connections are created using the connectToBus() function,
    which opens a connection to the server daemon and does the initial
    handshaking, associating that connection with a name. Further
    attempts to connect using the same name will return the same
    connection.

    The connection is then torn down using the disconnectFromBus()
    function.

    Once disconnected, calling connectToBus() will not reestablish a
    connection, you must create a new QDBusConnection instance.

    As a convenience for the two most common connection types, the
    sessionBus() and systemBus() functions return open connections to
    the session server daemon and the system server daemon,
    respectively. Those connections are opened when first used and are
    closed when the QCoreApplication destructor is run.

    D-Bus also supports peer-to-peer connections, without the need for
    a bus server daemon. Using this facility, two applications can
    talk to each other and exchange messages. This can be achieved by
    passing an address to connectToBus() function, which was opened by
    another D-Bus application using QDBusServer.
*/

/*!
    \enum QDBusConnection::BusType
    Specifies the type of the bus connection. The valid bus types are:

    \value SessionBus           the session bus, associated with the running desktop session
    \value SystemBus            the system bus, used to communicate with system-wide processes
    \value ActivationBus        the activation bus, the "alias" for the bus that started the
                                service

    On the Session Bus, one can find other applications by the same user that are sharing the same
    desktop session (hence the name). On the System Bus, however, processes shared for the whole
    system are usually found.
*/

/*!
    \enum QDBusConnection::RegisterOption
    Specifies the options for registering objects with the connection. The possible values are:

    \value ExportAdaptors                       export the contents of adaptors found in this object

    \value ExportScriptableSlots                export this object's scriptable slots
    \value ExportScriptableSignals              export this object's scriptable signals
    \value ExportScriptableProperties           export this object's scriptable properties
    \value ExportScriptableInvokables           export this object's scriptable invokables
    \value ExportScriptableContents             shorthand form for ExportScriptableSlots |
                                                ExportScriptableSignals |
                                                ExportScriptableProperties

    \value ExportNonScriptableSlots             export this object's non-scriptable slots
    \value ExportNonScriptableSignals           export this object's non-scriptable signals
    \value ExportNonScriptableProperties        export this object's non-scriptable properties
    \value ExportNonScriptableInvokables        export this object's non-scriptable invokables
    \value ExportNonScriptableContents          shorthand form for ExportNonScriptableSlots |
                                                ExportNonScriptableSignals |
                                                ExportNonScriptableProperties

    \value ExportAllSlots                       export all of this object's slots
    \value ExportAllSignals                     export all of this object's signals
    \value ExportAllProperties                  export all of this object's properties
    \value ExportAllInvokables                  export all of this object's invokables
    \value ExportAllContents                    export all of this object's contents
    \value ExportChildObjects                   export this object's child objects

    \sa registerObject(), QDBusAbstractAdaptor, {usingadaptors.html}{Using adaptors}
*/

/*!
    \enum QDBusConnection::UnregisterMode
    The mode for unregistering an object path:

    \value UnregisterNode       unregister this node only: do not unregister child objects
    \value UnregisterTree       unregister this node and all its sub-tree

    Note, however, if this object was registered with the ExportChildObjects option, UnregisterNode
    will unregister the child objects too.
*/

/*!
    Creates a QDBusConnection object attached to the connection with name \a name.

    This does not open the connection. You have to call connectToBus() to open it.
*/
QDBusConnection::QDBusConnection(const QString &name)
{
    if (name.isEmpty()) {
        d = 0;
    } else {
        QMutexLocker locker(&_q_manager()->mutex);
        d = _q_manager()->connection(name);
        if (d)
            d->ref.ref();
    }
}

/*!
    Creates a copy of the \a other connection.
*/
QDBusConnection::QDBusConnection(const QDBusConnection &other)
{
    d = other.d;
    if (d)
        d->ref.ref();
}

/*!
  \internal
   Creates a connection object with the given \a dd as private object.
*/
QDBusConnection::QDBusConnection(QDBusConnectionPrivate *dd)
{
    d = dd;
    if (d)
        d->ref.ref();
}

/*!
    Disposes of this object. This does not close the connection: you
    have to call disconnectFromBus() to do that.
*/
QDBusConnection::~QDBusConnection()
{
    if (d && !d->ref.deref())
        d->deleteYourself();
}

/*!
    Creates a copy of the connection \a other in this object. Note
    that the connection this object referenced before the copy, is not
    spontaneously disconnected.

    \sa disconnectFromBus()
*/
QDBusConnection &QDBusConnection::operator=(const QDBusConnection &other)
{
    if (other.d)
        other.d->ref.ref();
    if (d && !d->ref.deref())
        d->deleteYourself();
    d = other.d;
    return *this;
}

/*!
    Opens a connection of type \a type to one of the known busses and
    associate with it the connection name \a name. Returns a
    QDBusConnection object associated with that connection.
*/
QDBusConnection QDBusConnection::connectToBus(BusType type, const QString &name)
{
//    Q_ASSERT_X(QCoreApplication::instance(), "QDBusConnection::addConnection",
//               "Cannot create connection without a Q[Core]Application instance");
    if (!qdbus_loadLibDBus()) {
        QDBusConnectionPrivate *d = 0;
        return QDBusConnection(d);
    }

    QMutexLocker locker(&_q_manager()->mutex);

    QDBusConnectionPrivate *d = _q_manager()->connection(name);
    if (d || name.isEmpty())
        return QDBusConnection(d);

    d = new QDBusConnectionPrivate;
    DBusConnection *c = 0;
    QDBusErrorInternal error;
    switch (type) {
        case SystemBus:
            c = q_dbus_bus_get_private(DBUS_BUS_SYSTEM, error);
            break;
        case SessionBus:
            c = q_dbus_bus_get_private(DBUS_BUS_SESSION, error);
            break;
        case ActivationBus:
            c = q_dbus_bus_get_private(DBUS_BUS_STARTER, error);
            break;
    }
    d->setConnection(c, error); //setConnection does the error handling for us

    _q_manager()->setConnection(name, d);

    QDBusConnection retval(d);

    // create the bus service
    // will lock in QDBusConnectionPrivate::connectRelay()
    d->setBusService(retval);

    return retval;
}

/*!
    Opens a peer-to-peer connection on address \a address and associate with it the
    connection name \a name. Returns a QDBusConnection object associated with that connection.
*/
QDBusConnection QDBusConnection::connectToBus(const QString &address,
                                              const QString &name)
{
//    Q_ASSERT_X(QCoreApplication::instance(), "QDBusConnection::addConnection",
//               "Cannot create connection without a Q[Core]Application instance");
    if (!qdbus_loadLibDBus()){
        QDBusConnectionPrivate *d = 0;
        return QDBusConnection(d);
    }

    QMutexLocker locker(&_q_manager()->mutex);

    QDBusConnectionPrivate *d = _q_manager()->connection(name);
    if (d || name.isEmpty())
        return QDBusConnection(d);

    d = new QDBusConnectionPrivate;
    // setConnection does the error handling for us
    QDBusErrorInternal error;
    DBusConnection *c = q_dbus_connection_open_private(address.toUtf8().constData(), error);
    if (c) {
        if (!q_dbus_bus_register(c, error)) {
            q_dbus_connection_unref(c);
            c = 0;
        }
    }
    d->setConnection(c, error);
    _q_manager()->setConnection(name, d);

    QDBusConnection retval(d);

    // create the bus service
    // will lock in QDBusConnectionPrivate::connectRelay()
    d->setBusService(retval);

    return retval;
}

/*!
    Closes the connection of name \a name.

    Note that if there are still QDBusConnection objects associated
    with the same connection, the connection will not be closed until
    all references are dropped. However, no further references can be
    created using the QDBusConnection constructor.
*/
void QDBusConnection::disconnectFromBus(const QString &name)
{
    if (_q_manager()) {
        QMutexLocker locker(&_q_manager()->mutex);
        _q_manager()->removeConnection(name);
    }
}

/*!
    Sends the \a message over this connection, without waiting for a
    reply. This is suitable for errors, signals, and return values as
    well as calls whose return values are not necessary.

    Returns true if the message was queued successfully, false otherwise.
*/
bool QDBusConnection::send(const QDBusMessage &message) const
{
    if (!d || !d->connection) {
        QDBusError err = QDBusError(QDBusError::Disconnected,
                                    QLatin1String("Not connected to D-BUS server"));
        if (d)
            d->lastError = err;
        return false;
    }
    return d->send(message) != 0;
}

/*!
    Sends the \a message over this connection and returns immediately.
    When the reply is received, the method \a returnMethod is called in
    the \a receiver object. If an error occurs, the method \a errorMethod
    will be called instead.

    If no reply is received within \a timeout milliseconds, an automatic
    error will be delivered indicating the expiration of the call.
    The default \a timeout is -1, which will be replaced with an
    implementation-defined value that is suitable for inter-process
    communications (generally, 25 seconds).

    This function is suitable for method calls only. It is guaranteed
    that the slot will be called exactly once with the reply, as long
    as the parameter types match and no error occurs.

    Returns true if the message was sent, or false if the message could
    not be sent.
*/
bool QDBusConnection::callWithCallback(const QDBusMessage &message, QObject *receiver,
                                       const char *returnMethod, const char *errorMethod,
                                       int timeout) const
{
    if (!d || !d->connection) {
        QDBusError err = QDBusError(QDBusError::Disconnected,
                                    QLatin1String("Not connected to D-BUS server"));
        if (d)
            d->lastError = err;
        return false;
    }
    return d->sendWithReplyAsync(message, receiver, returnMethod, errorMethod, timeout) != 0;
}

/*!
    \overload
    \deprecated
    Sends the \a message over this connection and returns immediately.
    When the reply is received, the method \a returnMethod is called in
    the \a receiver object.

    This function is suitable for method calls only. It is guaranteed
    that the slot will be called exactly once with the reply, as long
    as the parameter types match and no error occurs.

    This function is dangerous because it cannot report errors, including
    the expiration of the timeout.

    Returns true if the message was sent, or false if the message could
    not be sent.
*/
bool QDBusConnection::callWithCallback(const QDBusMessage &message, QObject *receiver,
                                       const char *returnMethod, int timeout) const
{
    return callWithCallback(message, receiver, returnMethod, 0, timeout);
}

/*!
    Sends the \a message over this connection and blocks, waiting for
    a reply, for at most \a timeout milliseconds. This function is
    suitable for method calls only. It returns the reply message as
    its return value, which will be either of type
    QDBusMessage::ReplyMessage or QDBusMessage::ErrorMessage.

    If no reply is received within \a timeout milliseconds, an automatic
    error will be delivered indicating the expiration of the call.
    The default \a timeout is -1, which will be replaced with an
    implementation-defined value that is suitable for inter-process
    communications (generally, 25 seconds).

    See the QDBusInterface::call() function for a more friendly way
    of placing calls.

    \warning If \a mode is QDBus::BlockWithGui, this function will
             reenter the Qt event loop in order to wait for the
             reply. During the wait, it may deliver signals and other
             method calls to your application. Therefore, it must be
             prepared to handle a reentrancy whenever a call is
             placed with call().
*/
QDBusMessage QDBusConnection::call(const QDBusMessage &message, QDBus::CallMode mode, int timeout) const
{
    if (!d || !d->connection) {
        QDBusError err = QDBusError(QDBusError::Disconnected,
                                    QLatin1String("Not connected to D-Bus server"));
        if (d)
            d->lastError = err;

        return QDBusMessage::createError(err);
    }

    if (mode != QDBus::NoBlock)
        return d->sendWithReply(message, mode, timeout);

    d->send(message);
    QDBusMessage retval;
    retval << QVariant(); // add one argument (to avoid .at(0) problems)
    return retval;
}

/*!
    \since 4.5
    Sends the \a message over this connection and returns
    immediately. This function is suitable for method calls only. It
    returns an object of type QDBusPendingCall which can be used to
    track the status of the reply.

    If no reply is received within \a timeout milliseconds, an automatic
    error will be delivered indicating the expiration of the call. The
    default \a timeout is -1, which will be replaced with an
    implementation-defined value that is suitable for inter-process
    communications (generally, 25 seconds). This timeout is also the
    upper limit for waiting in QDBusPendingCall::waitForFinished().

    See the QDBusInterface::asyncCall() function for a more friendly way
    of placing calls.
*/
QDBusPendingCall QDBusConnection::asyncCall(const QDBusMessage &message, int timeout) const
{
    if (!d || !d->connection) {
        return QDBusPendingCall(0); // null pointer -> disconnected
    }

    QDBusPendingCallPrivate *priv = d->sendWithReplyAsync(message, timeout);
    return QDBusPendingCall(priv);
}

/*!
    Connects the signal specified by the \a service, \a path, \a interface and \a name parameters to
    the slot \a slot in object \a receiver. The arguments \a service and \a path can be empty,
    denoting a connection to any signal of the (\a interface, \a name) pair, from any remote
    application.

    Returns true if the connection was successful.

    \warning The signal will only be delivered to the slot if the parameters match. This verification
             can be done only when the signal is received, not at connection time.
*/
bool QDBusConnection::connect(const QString &service, const QString &path, const QString& interface,
                              const QString &name, QObject *receiver, const char *slot)
{
    return connect(service, path, interface, name, QStringList(), QString(), receiver, slot);
}

/*!
    \overload

    Connects the signal to the slot \a slot in object \a
    receiver. Unlike the previous connect() overload, this function
    allows one to specify the parameter signature to be connected
    using the \a signature variable. The function will then verify
    that this signature can be delivered to the slot specified by \a
    slot and return false otherwise.

    Returns true if the connection was successful.

    \note This function verifies that the signal signature matches the
          slot's parameters, but it does not verify that the actual
          signal exists with the given signature in the remote
          service.
*/
bool QDBusConnection::connect(const QString &service, const QString &path, const QString& interface,
                              const QString &name, const QString &signature,
                              QObject *receiver, const char *slot)
{
    return connect(service, path, interface, name, QStringList(), signature, receiver, slot);
}

/*!
    \overload
    \since 4.6

    Connects the signal to the slot \a slot in object \a
    receiver. Unlike the previous connect() overload, this function
    allows one to specify the parameter signature to be connected
    using the \a signature variable. The function will then verify
    that this signature can be delivered to the slot specified by \a
    slot and return false otherwise.

    The \a argumentMatch parameter lists the string parameters to be matched,
    in sequential order. Note that, to match an empty string, you need to
    pass a QString that is empty but not null (i.e., QString("")). A null
    QString skips matching at that position.

    Returns true if the connection was successful.

    \note This function verifies that the signal signature matches the
          slot's parameters, but it does not verify that the actual
          signal exists with the given signature in the remote
          service.
*/
bool QDBusConnection::connect(const QString &service, const QString &path, const QString& interface,
                              const QString &name, const QStringList &argumentMatch, const QString &signature,
                              QObject *receiver, const char *slot)
{

    if (!receiver || !slot || !d || !d->connection)
        return false;
    if (!interface.isEmpty() && !QDBusUtil::isValidInterfaceName(interface))
        return false;
    if (interface.isEmpty() && name.isEmpty())
        return false;

    QDBusWriteLocker locker(ConnectAction, d);
    return d->connectSignal(service, path, interface, name, argumentMatch, signature, receiver, slot);
}

/*!
    Disconnects the signal specified by the \a service, \a path, \a interface
    and \a name parameters from the slot \a slot in object \a receiver. The
    arguments must be the same as passed to the connect() function.

    Returns true if the disconnection was successful.
*/
bool QDBusConnection::disconnect(const QString &service, const QString &path, const QString &interface,
                                 const QString &name, QObject *receiver, const char *slot)
{
    return disconnect(service, path, interface, name, QStringList(), QString(), receiver, slot);
}

/*!
    \overload

    Disconnects the signal specified by the \a service, \a path, \a
    interface, \a name, and \a signature parameters from the slot \a slot in
    object \a receiver. The arguments must be the same as passed to the
    connect() function.

    Returns true if the disconnection was successful.
*/
bool QDBusConnection::disconnect(const QString &service, const QString &path, const QString& interface,
                                 const QString &name, const QString &signature,
                                 QObject *receiver, const char *slot)
{
    return disconnect(service, path, interface, name, QStringList(), signature, receiver, slot);
}

/*!
    \overload
    \since 4.6

    Disconnects the signal specified by the \a service, \a path, \a
    interface, \a name, \a argumentMatch, and \a signature parameters from
    the slot \a slot in object \a receiver. The arguments must be the same as
    passed to the connect() function.

    Returns true if the disconnection was successful.
*/
bool QDBusConnection::disconnect(const QString &service, const QString &path, const QString& interface,
                                 const QString &name, const QStringList &argumentMatch, const QString &signature,
                                 QObject *receiver, const char *slot)
{
    if (!receiver || !slot || !d || !d->connection)
        return false;
    if (!interface.isEmpty() && !QDBusUtil::isValidInterfaceName(interface))
        return false;
    if (interface.isEmpty() && name.isEmpty())
        return false;

    QDBusWriteLocker locker(DisconnectAction, d);
    return d->disconnectSignal(service, path, interface, name, argumentMatch, signature, receiver, slot);
}

/*!
    Registers the object \a object at path \a path and returns true if
    the registration was successful. The \a options parameter
    specifies how much of the object \a object will be exposed through
    D-Bus.

    This function does not replace existing objects: if there is already an object registered at
    path \a path, this function will return false. Use unregisterObject() to unregister it first.

    You cannot register an object as a child object of an object that
    was registered with QDBusConnection::ExportChildObjects.
*/
bool QDBusConnection::registerObject(const QString &path, QObject *object, RegisterOptions options)
{
    Q_ASSERT_X(QDBusUtil::isValidObjectPath(path), "QDBusConnection::registerObject",
               "Invalid object path given");
    if (!d || !d->connection || !object || !options || !QDBusUtil::isValidObjectPath(path))
        return false;

    QStringList pathComponents = path.split(QLatin1Char('/'));
    if (pathComponents.last().isEmpty())
        pathComponents.removeLast();
    QDBusWriteLocker locker(RegisterObjectAction, d);

    // lower-bound search for where this object should enter in the tree
    QDBusConnectionPrivate::ObjectTreeNode *node = &d->rootNode;
    int i = 1;
    while (node) {
        if (pathComponents.count() == i) {
            // this node exists
            // consider it free if there's no object here and the user is not trying to
            // replace the object sub-tree
            if ((options & ExportChildObjects && !node->children.isEmpty()) || node->obj)
                return false;

            // we can add the object here
            node->obj = object;
            node->flags = options;

            d->registerObject(node);
            //qDebug("REGISTERED FOR %s", path.toLocal8Bit().constData());
            return true;
        }

        // find the position where we'd insert the node
        QDBusConnectionPrivate::ObjectTreeNode::DataList::Iterator it =
            qLowerBound(node->children.begin(), node->children.end(), pathComponents.at(i));
        if (it != node->children.end() && it->name == pathComponents.at(i)) {
            // match: this node exists
            node = it;

            // are we allowed to go deeper?
            if (node->flags & ExportChildObjects) {
                // we're not
                qDebug("Cannot register object at %s because %s exports its own child objects",
                       qPrintable(path), qPrintable(pathComponents.at(i)));
                return false;
            }
        } else {
            // add entry
            node = node->children.insert(it, pathComponents.at(i));
        }

        // iterate
        ++i;
    }

    Q_ASSERT_X(false, "QDBusConnection::registerObject", "The impossible happened");
    return false;
}

/*!
    Unregisters an object that was registered with the registerObject() at the object path given by
    \a path and, if \a mode is QDBusConnection::UnregisterTree, all of its sub-objects too.

    Note that you cannot unregister objects that were not registered with registerObject().
*/
void QDBusConnection::unregisterObject(const QString &path, UnregisterMode mode)
{
    if (!d || !d->connection || !QDBusUtil::isValidObjectPath(path))
        return;

    QStringList pathComponents = path.split(QLatin1Char('/'));
    QDBusWriteLocker locker(UnregisterObjectAction, d);
    QDBusConnectionPrivate::ObjectTreeNode *node = &d->rootNode;
    int i = 1;

    // find the object
    while (node) {
        if (pathComponents.count() == i) {
            // found it
            node->obj = 0;
            node->flags = 0;

            if (mode == UnregisterTree) {
                // clear the sub-tree as well
                node->children.clear();  // can't disconnect the objects because we really don't know if they can
                                // be found somewhere else in the path too
            }

            return;
        }

        QDBusConnectionPrivate::ObjectTreeNode::DataList::Iterator it =
            qLowerBound(node->children.begin(), node->children.end(), pathComponents.at(i));
        if (it == node->children.end() || it->name != pathComponents.at(i))
            break;              // node not found

        node = it;
        ++i;
    }
}

/*!
    Return the object that was registered with the registerObject() at the object path given by
    \a path.
*/
QObject *QDBusConnection::objectRegisteredAt(const QString &path) const
{
    Q_ASSERT_X(QDBusUtil::isValidObjectPath(path), "QDBusConnection::registeredObject",
               "Invalid object path given");
    if (!d || !d->connection || !QDBusUtil::isValidObjectPath(path))
        return false;

    QStringList pathComponents = path.split(QLatin1Char('/'));
    if (pathComponents.last().isEmpty())
        pathComponents.removeLast();

    // lower-bound search for where this object should enter in the tree
    QDBusReadLocker lock(ObjectRegisteredAtAction, d);
    const QDBusConnectionPrivate::ObjectTreeNode *node = &d->rootNode;

    int i = 1;
    while (node) {
        if (pathComponents.count() == i)
            return node->obj;

        QDBusConnectionPrivate::ObjectTreeNode::DataList::ConstIterator it =
            qLowerBound(node->children.constBegin(), node->children.constEnd(), pathComponents.at(i));
        if (it == node->children.constEnd() || it->name != pathComponents.at(i))
            break;              // node not found

        node = it;
        ++i;
    }
    return 0;
}

/*!
    Returns a QDBusConnectionInterface object that represents the
    D-Bus server interface on this connection.
*/
QDBusConnectionInterface *QDBusConnection::interface() const
{
    if (!d)
        return 0;
    return d->busService;
}

/*!
    Returns true if this QDBusConnection object is connected.
*/
bool QDBusConnection::isConnected() const
{
    return d && d->connection && q_dbus_connection_get_is_connected(d->connection);
}

/*!
    Returns the last error that happened in this connection.

    This function is provided for low-level code. If you're using
    QDBusInterface::call(), error codes are reported by its return
    value.

    \sa QDBusInterface, QDBusMessage
*/
QDBusError QDBusConnection::lastError() const
{
    return d ? d->lastError : QDBusError();
}

/*!
    Returns the unique connection name for this connection, if this QDBusConnection object is
    connected, or an empty QString otherwise.

    A Unique Connection Name is a string in the form ":x.xxx" (where x
    are decimal digits) that is assigned by the D-Bus server daemon
    upon connection. It uniquely identifies this client in the bus.

    This function returns an empty QString for peer-to-peer connections.
*/
QString QDBusConnection::baseService() const
{
    return d ? d->baseService : QString();
}

/*!
    \since 4.5

    Returns the connection name for this connection, as given as the
    name parameter to connectToBus().

    The connection name can be used to uniquely identify actual
    underlying connections to buses.  Copies made from a single
    connection will always implicitly share the underlying connection,
    and hence will have the same connection name.

    Inversely, two connections having different connection names will
    always either be connected to different buses, or have a different
    unique name (as returned by baseService()) on that bus.

    \sa connectToBus(), disconnectFromBus()
*/
QString QDBusConnection::name() const
{
    return d ? d->name : QString();
}

/*!
    Attempts to register the \a serviceName on the D-Bus server and
    returns true if the registration succeeded. The registration will
    fail if the name is already registered by another application.

    \sa unregisterService(), QDBusConnectionInterface::registerService()
*/
bool QDBusConnection::registerService(const QString &serviceName)
{
    if (interface() && interface()->registerService(serviceName)) {
        if (d) d->registerService(serviceName);
        return true;
    }
    return false;
}

/*!
    Unregisters the service \a serviceName that was previously
    registered with registerService() and returns true if it
    succeeded.

    \sa registerService(), QDBusConnectionInterface::unregisterService()
*/
bool QDBusConnection::unregisterService(const QString &serviceName)
{
    if (interface()->unregisterService(serviceName)) {
        if (d) d->unregisterService(serviceName);
        return true;
    }
    return false;
}

static const char _q_sessionBusName[] = "qt_default_session_bus";
static const char _q_systemBusName[] = "qt_default_system_bus";

class QDBusDefaultConnection: public QDBusConnection
{
    const char *ownName;
public:
    inline QDBusDefaultConnection(BusType type, const char *name)
        : QDBusConnection(connectToBus(type, QString::fromLatin1(name))), ownName(name)
    { }

    inline ~QDBusDefaultConnection()
    { disconnectFromBus(QString::fromLatin1(ownName)); }
};

Q_GLOBAL_STATIC_WITH_ARGS(QDBusDefaultConnection, _q_sessionBus,
                          (QDBusConnection::SessionBus, _q_sessionBusName))
Q_GLOBAL_STATIC_WITH_ARGS(QDBusDefaultConnection, _q_systemBus,
                          (QDBusConnection::SystemBus, _q_systemBusName))

QDBusConnection QDBusConnection::sessionBus()
{
    return *_q_sessionBus();
}

QDBusConnection QDBusConnection::systemBus()
{
    return *_q_systemBus();
}

/*!
  \nonreentrant

  Returns the connection that sent the signal, if called in a slot activated
  by QDBus; otherwise it returns 0.

  \note Please avoid this function. This function is not thread-safe, so if
  there's any other thread delivering a D-Bus call, this function may return
  the wrong connection. In new code, please use QDBusContext::connection()
  (see that class for a description on how to use it).
*/
QDBusConnection QDBusConnection::sender()
{
    return QDBusConnection(_q_manager()->sender());
}

/*!
  \internal
*/
void QDBusConnectionPrivate::setSender(const QDBusConnectionPrivate *s)
{
    _q_manager()->setSender(s);
}

/*!
  \internal
*/
void QDBusConnectionPrivate::setBusService(const QDBusConnection &connection)
{
    busService = new QDBusConnectionInterface(connection, this);
    ref.deref(); // busService has increased the refcounting to us
                 // avoid cyclic refcounting

    QObject::connect(this, SIGNAL(callWithCallbackFailed(QDBusError,QDBusMessage)),
                     busService, SIGNAL(callWithCallbackFailed(QDBusError,QDBusMessage)),
                     Qt::QueuedConnection);
}

/*!
    \namespace QDBus
    \inmodule QtDBus

    \brief The QDBus namespace contains miscellaneous identifiers used
    throughout the QtDBus library.
*/

/*!
    \enum QDBus::CallMode

    This enum describes the various ways of placing a function call. The valid modes are:

    \value NoBlock              Place the call but don't wait for the reply (the reply's contents
                                will be discarded).
    \value Block                Don't use an event loop to wait for a reply, but instead block on
                                network operations while waiting. This means the
                                user-interface may not be updated until the function returns.
    \value BlockWithGui         Use the Qt event loop to wait for a reply. This means that the
                                user-interface will stay responsive (processing input events),
                                but it also means other events may happen, like signal delivery
                                and other D-Bus method calls.
    \value AutoDetect           Automatically detect if the called function has a reply.

    When using BlockWithGui, applications must be prepared for reentrancy in any function.
*/

QT_END_NAMESPACE

#endif // QT_NO_DBUS