[maemo-developers] [maemo-developers] Waiting for DBUS events in shell scripts

[From: Stefan Tomanek]

During my experiments with DBUS (see my other message) I tried to react to
DBUS signals through shell scripts; However, I encountered a strange problem:

I tried to parse the output of "dbus-monitor --system", which should be no
problem with sh, grep or awk. But there is an issue regarding the buffering of
its output pipe. What I tried to code boiles down to the following lines:

dbus-monitor --system | while read LINE; do <something with $LINE>; done

However, nothing happens. I noticed that no lines are passed through the pipe,
which can be checked by this command:

dbus-monitor --system | cat -

Instead of printing dbus events to console, nothing happens. I guess that this
might be a buffering issue with busybox or dbus-monitor, however these
commands work fine on the Debian system installed on my notebook.

What would be even cooler than this would be a dbus-signal-wait command, which
just sleeps until a specified events occurs; This way, a shell script waiting
for internet connectivity could just be implemented by writing:

while dbus-signal-wait -i com.nokia.......; do
    use_connection
done

OK, any comments regarding my ideas? :-)
-- 
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