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DeviceManager

kbd_evdev::devices

Struct DeviceManager 

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pub struct DeviceManager { /* private fields */ }
Expand description

Manages discovered input devices and watches for hotplug events.

On creation, scans the input directory for keyboard devices and sets up an inotify watch for add/remove events. Call poll_fds to get file descriptors for poll(2), then pass the results to process_polled_events to get key events.

§Lifecycle

  1. Create with DeviceManager::new
  2. Loop: a. Call poll(2) on poll_fds() b. Pass the polled fds to process_polled_events c. Handle the returned PollResult

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impl DeviceManager

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pub fn new(input_dir: &Path, grab_mode: DeviceGrabMode) -> Self

Create a new device manager for the given input directory.

Scans input_dir for existing keyboard devices and sets up an inotify watch for hotplug events. If inotify initialization fails, hotplug detection is silently disabled.

Use DeviceGrabMode::Exclusive to grab devices for exclusive access (requires write permission on the device nodes).

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pub fn poll_fds(&self) -> &[RawFd] ⓘ

File descriptors to pass to poll(2).

Includes the inotify watch descriptor (if active) followed by all open device descriptors. The order may change after hotplug events.

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pub fn process_polled_events(&mut self, polled_fds: &[pollfd]) -> PollResult

Process all ready file descriptors from a completed poll.

Returns key events and a list of device fds that were disconnected, so the caller can update its own key state tracking.

Trait Implementations§

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impl Debug for DeviceManager

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for DeviceManager

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fn default() -> Self

Returns the “default value” for a type. Read more

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