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Date: Sun, 24 Oct 2010 10:36:07 -0400
From: Ken Brown <kbrown AT cornell DOT edu>
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Subject: Re: emacs-23.2-3 DBus hangs
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On 10/24/2010 4:59 AM, Michael Albinus wrote:
> nyc4bos AT aol DOT com writes:
>
>> OK, it looks like loading dbus.el is where it fails when following
>> the instructions given in this URL:
>>
>>      http://cygwin.com/ml/cygwin/2010-08/msg00892.html
>>
>> I guess this step is not necessary but emacs shouldn't hang.
>>
>> Here's the steps I followed:
>>
>> $ eval `dbus-launch --auto-syntax`
>> $ echo $DBUS_SESSION_BUS_ADDRESS
>> unix:path=/tmp/dbus-dlr0QTU52y,guid=2ed2e65c8040f348d71319f94cc36ca0
>> $ xterm&   # This gives me a new xterm with "DBUS_SESSION_BUS_ADDRESS"
>> set.
>>
>> In new xterm:
>>
>> $ dbus-monitor
>> signal sender=org.freedesktop.DBus ->  dest=:1.0 serial=2 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameAcquired
>>     string ":1.0"
>> method call sender=:1.0 ->  dest=org.freedesktop.DBus serial=3 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=AddMatch
>>     string "type='method_call'"
>> method call sender=:1.0 ->  dest=org.freedesktop.DBus serial=4 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=AddMatch
>>     string "type='method_return'"
>> method call sender=:1.0 ->  dest=org.freedesktop.DBus serial=5 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=AddMatch
>>     string "type='error'"
>>
>> In first xterm:
>> $ emacs&
>>
>> In that emacs:
>> (dbus-get-unique-name :session)
>> ":1.0"
>>
>> load-file /usr/share/emacs/23.2/lisp/net/dbus.el.gz
>>
>> Hangs emacs after the "done" message...
>
> Likely, you didn't start the system bus (the scenario is only about the
> session bus).
>
> I've committed a patch to the Emacs-23 branch which ought to handle this
> situation:
>
>
> 2010-10-08  Michael Albinus<michael DOT albinus AT gmx DOT de>
>
> 	* dbusbind.c (xd_get_dispatch_status): Return a Lisp_Object.
> 	(xd_pending_messages): Catch xd_get_dispatch_status calls.
>
> I don't know, whether this has reached already in Cygwin's Emacs
> package. However, if you are using D-Bus you shall ensure that both the
> system and session buses are running.

That patch has not yet been applied to the Cygwin build.  I'm inclined 
to let it wait for Emacs 23.3, unless I need to issue a new release of 
Emacs for some other reason.  The workaround (making sure that the 
system bus is running) is easy enough.

Ken

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