Integration / D Bus Interview Questions
Define a D-Bus method call?
A D-Bus method call is a request-response message sent to a specific object path and interface on another process, asking it to run a named operation and, in most cases, return a result or an error back to the caller.
The caller specifies the destination service's bus name, the object path, the interface, the method name, and any arguments matching the method's expected type signature. The bus daemon routes the call to the destination process, which processes it and sends back either a method return message containing results or an error message describing what went wrong.
Method calls can be made synchronously, blocking until the reply arrives, or asynchronously, registering a callback and continuing other work while waiting, which matters a lot for avoiding unresponsive applications.
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