From: Michael Albinus <michael.albinus@gmx.de>
To: Julien Danjou <julien@danjou.info>
Cc: 9581@debbugs.gnu.org
Subject: bug#9581: 24.0.50; dbus-unregister-object fails if service is nil
Date: Sun, 25 Sep 2011 13:59:45 +0200 [thread overview]
Message-ID: <87mxdsvnm6.fsf@gmx.de> (raw)
In-Reply-To: <87aa9setsi.fsf@keller.adm.naquadah.org> (Julien Danjou's message of "Sun, 25 Sep 2011 13:38:21 +0200")
Julien Danjou <julien@danjou.info> writes:
>> I've played exactly this example (replacing "some.service" by
>> "org.gtk.Private.GduVolumeMonitor" in order to have an existing
>> service). No problem.
>
> Indeed. It works fine with org.gtk.Private.GduVolumeMonitor as service,
> but with "some.service" it fails. Why?
`dbus-register-signal' checks for the a valid service name, if it isn't
nil. Usually, "some.service" is not known; in my test
`dbus-register-signal' raises an error then.
How did you manage to register your signal with that service?
>> Could you apply (dbus-list-hash-table) before calling
>> `dbus-unregister-object', and show the result?
>
> Yeah. I start emacs-snapshot, then register then call
> `dbus-list-hash-table', it messages:
>
> (((:session "org.freedesktop.Notifications" "ActionInvoked")
> (":1.129"
> "org.freedesktop.Notifications" "/org/freedesktop/Notifications"
> notifications-on-action-signal
> "type='signal',interface='org.freedesktop.Notifications',member='ActionInvoked',sender=':1.129',path='/org/freedesktop/Notifications'"))
> ((:session "org.freedesktop.Notifications" "NotificationClosed")
> (":1.129" "org.freedesktop.Notifications"
> "/org/freedesktop/Notifications" notifications-on-closed-signal
> "type='signal',interface='org.freedesktop.Notifications',member='NotificationClosed',sender=':1.129',path='/org/freedesktop/Notifications'"))
These two entries show the correct match rule (the respective last element).
> ((:session "org.gtk.Private.RemoteVolumeMonitor" "VolumeAdded")
> (""
> "some.service" "/org/gtk/Private/RemoteVolumeMonitor" identity
> "\x01")))
This entry has a corrupted match rule. Again, which trick brings
`dbus-register-signal' to accept it? I must implement a counter-check
for this!
> Then I call unregister it yells:
> Debugger entered--Lisp error: (dbus-error "Unable to append argument" "\202\x01")
> dbus-call-method(:session "org.freedesktop.DBus" "/org/freedesktop/DBus" "org.freedesktop.DBus" "RemoveMatch" "\202\x01")
>
> Where the last string is obviously the same as I talked about above. :)
Which is the correct answer, because there isn't a valid match rule. I
could add a check for a valid match rule before sending the
"RemoveMatch" message, but I believe this is superfluous, because there
is exactly one place that match rule is appended. At this place, we must
prevent wrong values.
Best regards, Michael.
next prev parent reply other threads:[~2011-09-25 11:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-22 23:01 bug#9581: 24.0.50; dbus-unregister-object fails if service is nil Julien Danjou
2011-09-23 15:37 ` Michael Albinus
2011-09-23 16:12 ` Julien Danjou
2011-09-24 11:50 ` Michael Albinus
2011-09-24 14:19 ` Julien Danjou
2011-09-24 14:37 ` Michael Albinus
2011-09-25 11:38 ` Julien Danjou
2011-09-25 11:59 ` Michael Albinus [this message]
2011-09-25 12:19 ` Julien Danjou
2011-09-25 16:03 ` Michael Albinus
2011-09-26 12:16 ` Julien Danjou
2011-09-26 13:57 ` Michael Albinus
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