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From: Michael Albinus <michael DOT albinus AT gmx DOT de>
To: cygwin AT cygwin DOT com
Subject: Re: emacs-23.2-3 DBus hangs
References: <834ocd4jy2 DOT fsf AT aol DOT com> <4CC2F11B DOT 2070101 AT cornell DOT edu>	<83ocakl7m7 DOT fsf AT aol DOT com>
Date: Sun, 24 Oct 2010 10:59:38 +0200
In-Reply-To: <83ocakl7m7.fsf@aol.com> (nyc4bos@aol.com's message of "Sat, 23	Oct 2010 21:09:04 -0400")
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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.

Best regards, Michael.

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