libdbus - simple mainloop?

[Havoc Pennington]

somewhat shockingly I know, this limitation is documented in
read_write_dispatch docs:

 * The way to think of this function is that it either makes some sort
 * of progress, or it blocks. Note that, while it is blocked on I/O, it
 * cannot be interrupted (even by other threads), which makes this function
 * unsuitable for applications that do more than just react to received
 * messages.
 *

Havoc