Re: Multiple connections to dbus-daemon in single appication

Hi Lawrence,

Could you give any advises in detail ?
In worst case, there is three commands sending to three different
destination in parallel.
I need to design server to adapt with that worst case.

Thanks,


On Tue, Sep 18, 2018 at 9:00 PM <[email protected]> wrote:

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>    1. Re: dbus Digest, Vol 158, Issue 6 - Multiple connections to
>       dbus-daemon in single appication (dtdang)
>    2. Re: Multiple connections to dbus-daemon in single appication
>       (Lawrence D'Oliveiro)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 18 Sep 2018 10:00:21 +0900
> From: dtdang <[email protected]>
> To: [email protected]
> Subject: Re: dbus Digest, Vol 158, Issue 6 - Multiple connections to
>         dbus-daemon in single appication
> Message-ID:
>         <CAJpUOadFcJW3Z=
> Nrtx1r0RcCZP3btKNwMJA_bWTHgo7jyebM8A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
> Content-Type: text/plain; charset="utf-8"
>
> Many thanks Lawrence & Simon,
>
> But you might misunderstand my point.
>
> I would like to register in three separated connections since client will
> send command with option (like using dbus-send with
> option --dest=com.app.bluetooth or --dest=com.ap.wifi or --dest=com.ap.ap).
> So I want to open three separated connection with specific name in three
> threads to listen from client. It mean that my process will try to
> open/register 3 separated DBUS connections to dbus-daemon so that whatever
> being sent by client (regardless of  any --dest option) will be proceeded
> by my server application.
>
> So is it possible that an application can register multiple separated
> dbus-connections to dbus-daemon ? Three separated dbus connections should
> operate independently.
>
> You are right about I am not owning app.com or ap.com. It just my example.
> Many thanks for correcting it.
>
> On Mon, Sep 17, 2018 at 9:00 PM <[email protected]>
> wrote:
>
> > Send dbus mailing list submissions to
> >         [email protected]
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
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> > or, via email, send a message with subject or body 'help' to
> >         [email protected]
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> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of dbus digest..."
> >
> >
> > Today's Topics:
> >
> >    1. Multiple connections to dbus-daemon in single appication (dtdang)
> >    2. Re: Multiple connections to dbus-daemon in single appication
> >       (Lawrence D'Oliveiro)
> >    3. Re: Multiple connections to dbus-daemon in single appication
> >       (Simon McVittie)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Mon, 17 Sep 2018 11:30:52 +0900
> > From: dtdang <[email protected]>
> > To: [email protected]
> > Subject: Multiple connections to dbus-daemon in single appication
> > Message-ID:
> >         <CAJpUOadT=+scdTHV4xY6Zrmt18+_N4wHfLAZfjeMKyN=-
> > [email protected]>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Dear all,
> >
> > Is it possible to create multiple connections by using "dbus_bus_get" &
> > "dbus_bus_request_name" inside a single server to listen from multiple
> > client ?
> > For instance, I just want to register three connections to dbus-daemon as
> > bellows in a single application.
> >
> > com.app.bluetooth
> > com.ap.wifi
> > com.ap.ap
> >
> > Thanks,
> > -------------- next part --------------
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> >
> > ------------------------------
> >
> > Message: 2
> > Date: Mon, 17 Sep 2018 15:03:11 +1200
> > From: Lawrence D'Oliveiro <ldo-kC51rjc0cqs1dNLGKZg6taU/[email protected]>
> > To: [email protected]
> > Subject: Re: Multiple connections to dbus-daemon in single appication
> > Message-ID: <20180917150311.07e9ddcf-QEjm8wl6P5m5/[email protected]>
> > Content-Type: text/plain; charset=US-ASCII
> >
> > On Mon, 17 Sep 2018 11:30:52 +0900, dtdang wrote:
> >
> > > Is it possible to create multiple connections by using "dbus_bus_get"
> > > & "dbus_bus_request_name" inside a single server to listen from
> > > multiple client ?
> > > For instance, I just want to register three connections to
> > > dbus-daemon as bellows in a single application.
> > >
> > > com.app.bluetooth
> > > com.ap.wifi
> > > com.ap.ap
> >
> > You can register multiple bus names on a single connection.
> >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Mon, 17 Sep 2018 12:45:10 +0100
> > From: Simon McVittie <smcv-ZGY8ohtN/[email protected]>
> > To: [email protected]
> > Subject: Re: Multiple connections to dbus-daemon in single appication
> > Message-ID: <20180917114510.GA22202-KlMPWNVy2xGznp5rFuqWZquhQ75O6kbf0Fzj8UutsXo@public.gmane.org>
> > Content-Type: text/plain; charset=us-ascii
> >
> > On Mon, 17 Sep 2018 at 11:30:52 +0900, dtdang wrote:
> > > Is it possible to create multiple connections by using "dbus_bus_get" &
> > > "dbus_bus_request_name" inside a single server to listen from multiple
> > client ?
> >
> > You seem to be mixing up connections with well-known bus names.
> >
> > As Lawrence D'Oliveiro said in a previous reply, you can register
> > multiple well-known bus names on the same connection by calling
> > dbus_bus_request_name() several times on the same DBusConnection. If you
> > want multiple well-known bus names, 95% of the time this is the right
> > thing to do.
> >
> > You can also open multiple connections, each of which can own any number
> > of well-known names, by calling dbus_bus_get_private() several times to
> > get several distinct DBusConnection objects. This is usually the wrong
> > thing to do, but is an option if you have specialized requirements.
> > If you do this, beware that there are no ordering guarantees between
> > different DBusConnection objects: if two messages A and B are sent,
> > then one DBusConnection might see both A and B before a second
> > DBusConnection has seen A.
> >
> > Consider using a more user-friendly (and thread-safe) D-Bus
> implementation
> > such as GLib's GDBus. The reference implementation, libdbus, has this
> > statement on the first page of its documentation:
> >
> >     This manual documents the *low-level* D-Bus C API. **If you use
> >     this low-level API directly, you're signing up for some pain.**
> >
> > In GDBus, the equivalent of dbus_bus_get() is g_bus_get()
> > or g_bus_get_sync(), the equivalent of DBusConnection is
> > GDBusConnection, the equivalent of dbus_bus_request_name() is
> > g_bus_own_name_on_connection(), and the closest equivalent for
> > g_bus_get_private() is g_dbus_connection_new_for_address[_sync]()
> > with the G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT and
> > G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION flags. Similar comments
> > apply about the ability to own more than one well-known name per
> > GDBusConnection.
> >
> > > com.app.bluetooth
> > > com.ap.wifi
> > > com.ap.ap
> >
> > I suspect you don't own app.com (owned by Gannett Media Technologies
> > International, according to whois) and ap.com (owned by Audio Precision,
> > according to web page content). Please choose a namespace starting with
> > a reversed domain name that your organisation controls.
> >
> >     smcv
> >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
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> >
> > End of dbus Digest, Vol 158, Issue 6
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> ------------------------------
>
> Message: 2
> Date: Tue, 18 Sep 2018 13:22:51 +1200
> From: Lawrence D'Oliveiro <ldo-kC51rjc0cqs1dNLGKZg6taU/[email protected]>
> To: [email protected]
> Subject: Re: Multiple connections to dbus-daemon in single appication
> Message-ID: <20180918132251.34490d17-QEjm8wl6P5m5/[email protected]>
> Content-Type: text/plain; charset=US-ASCII
>
> On Tue, 18 Sep 2018 10:00:21 +0900, dtdang wrote:
>
> > I would like to register in three separated connections since client
> > will send command with option (like using dbus-send with
> > option --dest=com.app.bluetooth or --dest=com.ap.wifi or
> > --dest=com.ap.ap). So I want to open three separated connection with
> > specific name in three threads to listen from client.
>
> You can do all that on one connection.
>
>
> ------------------------------
>
> Subject: Digest Footer
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> End of dbus Digest, Vol 158, Issue 7
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