This is an amazing article for folks interested in the low level IPC dbus. systemd, network manager, and or applications are leveraging dbus and with the new dbusbroker I expect more and more applications leverage it. It’s MASSIVELY confusing at first, but this is such a great article I hope it helps anyone interested in thr low level communications of userspace level linux applications.
Skimmed over the whole article – I wish this had been available back when I was trying to piece together the basics from the documentation. There really needs to be a 2nd part, though, with some discussion of the GVariant signatures, which the author says were ‘beyond the scope of’ this article – which is true; nevertheless, understanding that syntax (and how to use it e.g. with gdbus) is an absolute requirement for using dbus properly; and as a silly amateur, I lost so much time over them.
D-Bus is a message bus system, a simple way for applications to talk to one another. In addition to interprocess communication, D-Bus helps coordinate process lifecycle; it makes it simple and reliable to code a “single instance” application or daemon, and to launch applications and daemons on demand when their services are needed.
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