Emacs and DBUS
Thu Aug 26 19:41:00 GMT 2010
On 8/26/2010 12:16 AM, Michael Albinus wrote:
> Ken Brown writes:
>>> The blocking you observed when dbus.el is loaded doesn't occur with a
>>> build from the Emacs trunk (r101187).
>> Correction: It occurs if and only if the system messagebus service is
> I'm confused: do you mean, the problem is happening when the system bus
> is running, or when it is *not* running? I suspect the latter case.
I really meant it the way I said it: The problem occurs if the system
bus *is* running. I've done some further testing, and here are the
results, all with a build of emacs from the trunk, starting in the emacs
1. With the system bus not running, I start Emacs via 'dbus-launch
./emacs.exe -Q&' and load dbus.el. In the *scratch* buffer I evaluate
some of the expressions that you suggested in your earlier email:
(defun my-dbus-signal-handler (&rest args)
(message "Signal from bus %s received: %s"
(dbus-event-bus-name last-input-event) args))
:session dbus-service-dbus dbus-path-dbus dbus-interface-dbus
((:session "org.freedesktop.DBus" "NameOwnerChanged")
("org.freedesktop.DBus" "/org/freedesktop/DBus" my-dbus-signal-handler))
Now I try 'dbus-monitor --session' in the xterm window from which I
started emacs. This produces output in the xterm window, but I don't
see anything in Emacs.
Back to *scratch*:
This throws me into the lisp debugger with the error (dbus-error "Failed
to connect to socket /var/run/dbus/system_bus_socket: Connection
refused"). I guess this is to be expected, since the system bus is not
running. I now start the system bus via 'net start messagebus' in a
shell, and I try again:
Is this to be expected, that I get the same name for :system that I got
2. With the system bus running, I start Emacs as above and load dbus.el.
The cursor stops blinking, and Emacs becomes unresponsive. I can type
C-g and hear a bell, and I can type C-x C-c to exit, but I can't get a
response to any other key presses.
I'm willing to try anything else you suggest. Otherwise, I hope you're
able to debug this when you return from your travels. The unstripped
emacs-X11.exe binary (Emacs 23.2) is at
and the binary for my build from the trunk is at
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