Integration / D Bus Interview Questions
What is D-Bus introspection?
Introspection is D-Bus's built-in mechanism for a client to ask an object, at runtime, exactly which methods, signals, and properties it exposes, without needing prior documentation or hardcoded knowledge of that service's API.
Any object that supports it implements the org.freedesktop.DBus.Introspectable interface with a single method, Introspect(), which returns an XML document describing the object: its interfaces, each method's name and argument types, each signal's name and argument types, each property's name, type, and access mode, and any child object paths nested beneath it.
This is what lets generic tools, GUI browsers like D-Feet, and code generators like gdbus-codegen work against arbitrary services they've never seen before, simply by asking the object to describe itself first.
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