Linux udev Workflow Explained
udev is a device manager in the Linux system that is responsible for detecting and handling device plug-and-play events. Its working process is described as follows:
- The kernel sends an event notification to the udev daemon when a device is plugged in or removed.
- Rule Matching: After receiving event notifications from the kernel, the udev daemon matches the events based on predefined rules.
- Device management: If the rules match successfully, udev will perform corresponding actions such as loading device drivers, assigning device nodes, and executing user-defined scripts.
- Update device information: udev will also update the relevant information of devices in the system, such as device node permissions and names.
In general, the workflow of udev includes receiving kernel event notifications, matching rules, managing devices, and updating device information. Through these processes, udev achieves dynamic management and configuration of devices in the Linux system.
