gmane.comp.freedesktop.dbus

dbus-python cmake

Christoph Höger — 2012-05-24T11:37:41

I need python-dbus on windows. So I started a cmake port over there:

https://github.com/choeger/dbus-python-cmake

Currently it does only build & test on linux. I'll get to build & test 
on windows now. Installing should be trivial.

For testing on windows I first need to either get a bash or to port the 
testsuite to cmake/pure python. Dunno how long this will take.


Please let me know, what you think and feel free to merge if you think 
my work is useful.

dbus-1.4.20.tar.gz hangs after install in ubuntu 11.04

Lee Wei han — 2012-05-22T17:04:50

i am trying to compile vlc, everything from source, i need the dbus 
package, after i success install dbus-1.4.20, i reboot, the ubuntu 
crash, what shall i do please help_______________________________________________
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Dbus multiple threading problem

Vinoth V — 2012-05-21T15:01:57

Hi All,

I am using dbus-1.4.16 (glib binding is done using the library glib-2.30 )
in a multi-threaded environment, like a server(different process) runs in
one end, and a client(different process) in one end, but if i run a client,
calling a  same synchronous function for multiple times using threads, i am
getting error like

"Error in called_function name,
msg="GDBus.Error:org.freedesktop.DBus.Error.NoReply: Message did not
receive a reply (timeout by message bus)".

(process:2064): GLib-CRITICAL **: g_variant_get_fixed_array: assertion
`g_variant_is_of_type (value, G_VARIANT_TYPE_ARRAY)' failed

but if i call this function only once, i am gettin my output properly.

so i have a doubt like, whether dbus allows simultaneous execution
of synchronise functions ? or it is only serial execution.

kindly help me.

Regards
Vinoth
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libdbus and edge triggered watches

Nicolas Cavallari — 2012-05-21T12:58:46

Hi,

I am trying to use D-Bus in a C++(11) application.

I tried using dbus-c++, and integrated it with a external mainloop
(boost::asio) which internally uses edge triggered epoll. But i
found that some signal handlers are deferred, so watches are not always
working. I am using the custom watch API from dbus-c++, which is
essentially a thin wrapper around the DBusWatch API from libdbus.

Looking at the code, libdbus does not seem to support edge triggered
watches. Edge triggered support would essentially mean that libdbus
must read()/write() from/to the fd until it returns EAGAIN.
From what i see, the only limitation seems to come from the default
value of the max_bytes_{read,written}_per_iteration variables. I think
that setting them to an arbitrary high number should be enough to make
libdbus work with edge triggered epoll. Am i correct ? And how could i
change these variables ?

The alternative would be to call the (wrapped) dbus_watch_handle()
repeatedly until the fd is not readable/writable anymore, but that would
be an ugly hack to busyloop like that, considering it shouldn't be hard
to make libdbus work with edge triggered watches.
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Dbus-monitor cannot detect reply message for system dbus

2012-05-21T08:39:53

Thanks for your reply.  By the way,  is there a plan to fix this bug in future version ?

Cheers
Liang.



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Dbus-monitor cannot detect reply message for system dbus

2012-05-21T00:25:18

Hi:
         
          I use dbus-monitor to monitor method call and reply message on system dbus.
But I only get method call message, but can not any reply message. However i can get
both types of messages on session dbus with dbus-monitor.  I find someone has meet 
similiar issue in early version  http://lists.freedesktop.org/archives/dbus/2009-April/011146.html. 
Could someone kindly tell me how to fix it or it is a bug in system dbus.  Thanks a lot.

I am using dbus-1.5.8,  and system.conf is :

  <policy context="default">

    <!-- All users can connect to system bus -->
    <allow user="*"/>

    <!-- Holes must be punched in service configuration files for
         name ownership and sending method calls -->
    <deny own="*"/>
    <deny send_type="method_call"/>


    <!-- Signals and reply messages (method returns, errors) are allowed
         by default -->
    <allow send_type="signal"/>
    <allow send_requested_reply="true" send_type="method_return"/>
    <allow send_requested_reply="true" send_type="error"/>

    <!-- All messages may be received by default -->
    <allow receive_type="method_call"/>
    <allow receive_type="method_return"/>
    <allow receive_type="error"/>
    <allow receive_type="signal"/>

    <!-- Allow anyone to talk to the message bus -->
    <allow send_destination="org.freedesktop.DBus"/>
    <!-- But disallow some specific bus services -->
    <deny send_destination="org.freedesktop.DBus"
          send_interface="org.freedesktop.DBus"
          send_member="UpdateActivationEnvironment"/>


    <!-- Allow everything to be sent -->
    <allow send_destination="*" eavesdrop="true"/>
    <!-- Allow everything to be received -->
    <allow eavesdrop="true"/>
    <!-- Allow anyone to own anything -->
    <allow own="*"/>
</policy>


Cheers
Liang.



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send credentials or not?

Martin Vidner — 2012-05-17T11:25:13

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Sending response from an asynchrnous method call

Sruthi M — 2012-05-17T07:15:27

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Way to show programs receiving dbus-signal ?

2012-05-14T15:44:10

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MessageRead in Dbus java is not found

Lusy Hakobyan — 2012-05-09T15:48:55

Hello guys,

I am new to Dbus world.
I would highly appreciate if someone would react to my email.

I m using ubuntu 12.04 and making a program with Dbus java.
I could connect successfully to the session bus but when i am trying to
read or write i get strange errors.

I should mention that i got all the jar files by installing directly from
ubuntu so I didnt not build anything special.
just apt-get install libdbus-java.

the peace of code that i have is here.

mDBusConn =
DBusConnection.getConnection("tcp:host=xxx.xxx.xxx.xxx,port=123544");

 InputStream in = new ByteArrayInputStream(data);
 MessageReader mReader = MessageReader(in);

the error that i get during the compilation is

*[javac] DbusChannel.java:39: cannot find symbol
    [javac] symbol  : method MessageReader(java.io.InputStream)
    [javac] location: class com.tomtom.reflection2.dbus.DbusChannel
    [javac]      MessageReader mReader = MessageReader(in);
    [javac]                                                         ^
    [javac] 1 error*


I dont understand why it is complaining about the constructor, since based
on documentation(http://dbus.freedesktop.org/doc/dbus-java/api/) it should
be there.
I am using just gedit for implementing classes so i cant see immediately if
it is there or not.


Thanks in advance,
Kind regards,
Lusy
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alloc_link, pthread mutex locks, malloc and performance

Andrew Marlow — 2012-05-03T13:21:17

Hello dbus guys,

I am new to dbus and need some help please. I have some performance
concerns about a dbus app I am working on.

callgrind indicates that many posix mutex locks are being taken on the
server side during message validation. These calls are in alloc_link
(and the corresponding call to free_link). I did a temporary hack to
these functions, making them use malloc and free instead. This caused
the mutex locks to drop off the radar (hurrah!) but it also caused
malloc to feature much higher in the costs (boo!).

I know that the code is the way it is because originally the cost of
lots of small allocates via direct calls to malloc was found to be
expensive. Heap fragmentation springs to mind. This was solved using a
memory pool which was later made thread-safe by adding the locks. So
going back to direct malloc is only an experimental hack. I am not
proposing that this is done officially. Indeed, my profile results
demonstrate that the repeated allocates are an issue. But I have a few
thoughts about how to deal with this issue that I want to discuss in
this mailinglist.

First, has anyone looked at replacing the memory pool with a more
efficient allocator than malloc? I came across one called nedmalloc, at
http://www.nedprod.com/programs/portable/nedmalloc. This seems to
compare very favourably with hoard but with a more permissive license.
Has anyone tried that? What do people think?

Second, I notice from my callgrind results that the memory pool is used
extensively during message validation. Would it not be possible to
change the message validation so it used its own memory management. A
validation memory management package might still use a memory pool but
might also take a parameter to say whether or not to lock the pool. I am
just guessing here, since I dont know enough about the dbus code, but I
am wondering about specifying such a flag in my server since I know my
server is single-threaded. Maybe there should be a set flag routine that
a server can call during initialisation that says whether or not it is
single-threaded. What do people think about this please?

Third, a hybrid approach could be used. alloc_link could continue to use
the memory pool but the pool could employ a flag that controls whether
or not it locks the pool. Single threaded servers can set this flag to
false. This is slightly more dangerous because it assumes that a
single-threaded server will not have any threads started behind the dbus
scenes that calls alloc_link.

--
Regards,

Andrew Marlow

This transmission contains information that may be confidential and contain personal views which are not necessarily those of YouView TV Ltd. YouView TV Ltd (Co No:7308805) is a limited liability company registered in England and Wales with its registered address at B6, Ground Floor Broadcast Centre, 201 Wood Lane, London, UK, W12 7TP.

For details see our web site at http://www.youview.com.

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Activation problem: shell script

Dave Lee — 2012-04-21T09:55:09

hello. I am trying to set up dbus activation for a service (running on system bus). The service file looks like this:

[D-BUS Service]
Name=...
Exec=...
User=root

The Exec= line specifies a shell script, which basically read options from a config file, and then
launch a daemon with these options as arguments.

I found that if my script's hashbang is #!/bin/sh, dbus won't do activation. When I launch a client,
it will attempt to activate the service, but then will show an error:

ERROR: Failed to connect to XXXXX: org.freedesktop.DBus.Error.Spawn.ExecFailed: Cannot launch daemon, file not found or permissions invalid
ERROR: Failed to connect to daemon (bus: 'system')!


However if the hashbang is #!/usr/bin/env sh, activation works.

Why does the hashbang make a difference? Thanks.

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problem with dbus execution

ben ayed wiem — 2012-04-18T15:05:14

Hi,

I have runned an application, on the robot MarXbot, that call these 2 functions in the same time and wait for their replies. 

First function:
QDBusConnection connection = QDBusConnection::systemBus();
 ch::epfl::mobots::AsebaNetwork network(DBUS_SERVICE_ASEBA, DBUS_PATH_ASEBA, connection);
 QDBusPendingReply<Values> reply = network.GetVariable("base-sensors","proximity.corrected");
 reply.waitForFinished();
 if (reply.isError()){
     qDebug() << "error proxy \n";
   } 

Second function:
QDBusConnection connection = QDBusConnection::systemBus();

ch::epfl::mobots::AsebaNetwork network(DBUS_SERVICE_ASEBA, DBUS_PATH_ASEBA, connection);
QDBusPendingReply<Values> replyV = network.GetVariable("sensor-turret","sharp.value");
 replyV.waitForFinished();   
QDBusPendingReply<Values> replyA = network.GetVariable("sensor-turret","sharp.angle");
replyA.waitForFinished();
if (replyV.isError()||replyA.isError()){    
 qDebug() << "error sharp \n";
  } 

but some times I get this message:

QDBusConnectionPrivate::connectSignal: received error from D-Bus server while connecting signal to QDBusAbstractInterface::_q_serviceOwnerChanged(QString,QString,QString): org.freedesktop.DBus.Error.NoMemory (Not enough memory)
QDBusConnectionPrivate::connectSignal: received error from D-Bus server while connecting signal to QDBusAbstractInterface::_q_serviceOwnerChanged(QString,QString,QString): org.freedesktop.DBus.Error.NoMemory (Not enough memory)
error proxy
 
QDBusConnectionPrivate::connectSignal: received error from D-Bus server while connecting signal to QDBusAbstractInterface::_q_serviceOwnerChanged(QString,QString,QString): org.freedesktop.DBus.Error.NoMemory (Not enough memory)
error sharp
 
QDBusConnectionPrivate::connectSignal: received error from D-Bus server while connecting signal to QDBusAbstractInterface::_q_serviceOwnerChanged(QString,QString,QString): org.freedesktop.DBus.Error.NoMemory (Not enough memory)

When I run only one function in a time, I don't get this message and the execution go very well.

Is there any way to avoid this problem?

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DBus for LSB

Robert Schweikert — 2012-04-17T17:39:11

Hi,

For the next LSB release (LSB 5.0) the LSB work group would like to 
include DBus in the LSB. For this to heppen we need to figure out what 
interfaces and commands should be included in the LSB. The target 
version for inclusion would be DBus 1.4

Taking a look at openSUSE 11.4 I found 333 interfaces marked as GLOBAL 
in the library. But I didn't find any documentation of the interfaces on 
the DBus site. I was probably looking the the wrong place, thus if 
someone can point me in the right direction, that would be great. Also, 
should all the 333 interfaces be in the LSB, and if not what would be 
the best candidates for LSB inclusion?

On the DBus site I found the following commands documented:

dbus-daemon, dbus-send, dbus-monitor, dbus-launch, and dbus-uuidgen

on openSUSE the dbus-launch command does not exist. Is this also common 
on other distributions?

Thanks,
Robert

control groups

Havoc Pennington — 2012-04-11T13:49:49

Hi,

In the performance paper
http://shorestreet.com/sites/shorestreet.com/files/dbus-perf-report-0.9.9.pdf
there's discussion of scheduler issues where the bus only gets the
same CPU slice as each individual dependent app, so in the aggregate
the apps get way too much time and the bus way too little.

I was just reading Lennart's post here
http://0pointer.de/blog/projects/cgroups-vs-cgroups.html where he
mentions balancing mysql and httpd even though they are made up of
different numbers of processes.

Some docs here:
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Resource_Management_Guide/sec-cpu.html

If you were to split the system into "dbus-daemon" and "everything
else" and say that when both need CPU, the CPU should be divided
equally between those two groups, I wonder if that would solve the
scheduling problem. I don't know if it's possible.

Havoc
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DBUS getall method

Shah, Nirav J2 — 2012-04-06T19:32:31

Hello,

I have a dbus implementation which is implementing multiple Interfaces inside a single object beside the standard dbus interfaces. I have 2 questions.

1) The get_all() function takes the interface_name as an input. But this input seems to be optional (at-least according to the qdbusviewer). According to the specification is it in fact true (for multiple interface usecase).

2) If the input is infact optional and If some of the properties are not always valid. In the situation can the get_all() just skip those properties? I tried this and maybe it's just my implementation but it crashed. Has anyone done something similar? I couldn't find any examples of multiple interface in a single object at all.

PS: By valid I mean it is not always relevant.

Example to clarify the doubt.
//standard Interface each needs to implement
Object 1-> Object1.Dbus.Introspectable
Object 1-> Object1.Dbus.Properties
//implementation specific interfaces.
Object 1 -> Object1.Interface.A
Object 1-> Object1.Interface.B
Object 1 -> Object1.Interface.C

During introspection I am passing a structure with all the properties belonging to all the interfaces.

Each interface has a set of properties which are not always valid for the object. So in the above example for a particular run time scenario properties of Interface.B may not valid. What is the get all supposed to do then.

Thanks,
Nirav.

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Bluetooth headset not appearing in pavucontrol

Fabrice DELENTE — 2012-04-01T13:10:27

Hello.

I have compiled and installed blueman and pulseaudio on a linux
slackware 13.37 system.

In blueman, I can pair my bluetooth headset with the computer, and
then connect to the AudioSink (A2DP) service.

However, in pavucontrol, I don't have the headset available to choose
in the "Configuration" tab, as is the case in Ubuntu for example.

I can't use the BT headset in mplayer either (with alsa as an output
layer), because I get an error (bt_audio_service_open: connect()
failed: Connection refused (111))

Is this a D-BUS error?

Any help/hint around?

Thanks!

Mounting volumes through the command line

László Monda — 2012-03-31T22:12:32

Hi List,

There's a second HDD in my laptop which is fully encrypted.  I saved
its password and I can easily mount it by simply clicking on its label
in Nautilus.  I'd like to automatically get this HDD mounted upon
logging into Gnome.

I'm sure that it's possible somehow, either through D-Bus or by
calling Nautilus with some arguments.  D-Bus may be more beneficial
because it wouldn't involve any windows popping up.

Please help or direct me to somewhere where somebody can answer my question.

Thanks in advance.

libdbus : 495: assertion failed "!(connection)->have_connection_lock"file "external/dbus/dbus/dbus-connection.c

Ankit Verma — 2012-03-29T21:04:52

Hi,

I am getting this assertion failure causing a crash on a android mobile
phone using DBUS 1.4.0.

W libdbus : 495: assertion failed "!(connection)->have_connection_lock"
file "external/dbus/dbus/dbus-connection.c" line 369 function
_dbus_connection_lock
01-02 09:44:10.580 495 1620 F libc : Fatal signal 11 (SIGSEGV) at
0xdeadbaad (code=1)

I have picked up below few patches from the community which could have
fixed this issue, but i am still seeing the issue.

1.  dbus_bus_register: don't unref the messages with the lock held
2.  _dbus_connection_message_sent: rename to _unlocked
3.  Add _dbus_counter_notify and call it after every adjustment
4.  Comment some places where it's OK to unref a message despite holding
locks
5.  When attaching counters to messages, don't automatically notify
callbacks
6.  Don't inline the contents of _dbus_connection_unlock
7.  Don't finalize sent or dispatched messages while under the connection
lock

Can anyone suggest if this issue is already fixed on latest dbus and point
me to the patches which fixed it.

Thanks a lot,
Ankit
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Connect to signal in DBUS

ben ayed wiem — 2012-03-27T20:36:27

Hi,

I am looking for a fonction in DBUS that able me to connect to a signal like this one that exist in Glib :"dbus_g_proxy_connect_signal" .

The reason that I can't use the Glib library is that I manipulate INT16 variable which Glib don't support.

 
Any help please.

Best regards.
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Announcing dbus 1.5.12

Simon McVittie — 2012-03-27T18:22:06

The “Big Book of Science” release.

http://dbus.freedesktop.org/releases/dbus/dbus-1.5.12.tar.gz
http://dbus.freedesktop.org/releases/dbus/dbus-1.5.12.tar.gz.asc

• Add public API to validate various string types:
  dbus_validate_path(), dbus_validate_interface(),
  dbus_validate_member(), dbus_validate_error_name(),
  dbus_validate_bus_name(), dbus_validate_utf8()
  (fd.o #39549, Simon McVittie)

• Turn DBusBasicValue into public API so bindings don't need to invent
  their own "union of everything" type (fd.o #11191, Simon McVittie)

• Enumerate data files included in the build rather than using find(1)
  (fd.o #33840, Simon McVittie)

• Add support for policy rules like
  <allow own_prefix="com.example.Service"/> in dbus-daemon
  (fd.o #46273, Alban Crequy)

• Windows-specific:
  · make dbus-daemon.exe --print-address (and --print-pid) work again
    on Win32, but not on WinCE (fd.o #46049, Simon McVittie)
  · fix duplicate case value when compiling against mingw-w64
    (fd.o #47321, Andoni Morales Alastruey)
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