emacs-23.2-3 DBus hangs

Michael Albinus michael.albinus@gmx.de
Sun Oct 24 14:36:00 GMT 2010


nyc4bos@aol.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.albinus@gmx.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.

Best regards, Michael.

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