Desktop applications and system services exchange method calls and signals through a common message bus.
This mechanism does not directly create device nodes.
Which mechanism is appropriate?
D-Bus mediates interprocess messages between clients and services through system and session buses.
Detailed explanation
Incorrect. udev manages device nodes and links in response to device events.
Incorrect. udev manages device nodes and links in response to device events.
Incorrect. sysfs exposes kernel objects and device attributes.
Incorrect. sysfs exposes kernel objects and device attributes.
Incorrect. procfs exposes process and kernel state through virtual files.
Incorrect. procfs exposes process and kernel state through virtual files.
Correct. D-Bus brokers method calls and signals between processes.
Correct. D-Bus brokers method calls and signals between processes.
Try it yourself
An example you can run in a temporary verification environment.
busctl --help | sed -n '1,10p'Expected result
list、status、monitor、call等のバス操作Key points
- D-Bus is an IPC message bus
- System and session buses differ
- It is distinct from udev
Notes
- Environment: systemd busctl / ヘルプ表示のみ
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.