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For various usecases it is useful to read relevant data from the DMI udev device, but this means we need a way to wait for it for this to be probed to be race-free. Hence tag it with "systemd", so that sys-devices-virtual-dmi-id.device can be used as synchronization point.
Files in this directory contain configuration for systemd-udevd.service, a daemon that manages symlinks to device nodes, permissions of devices nodes, emits device events for userspace, and renames network interfaces. See man:udev(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of service itself. Use 'systemd-analyze cat-config udev/rules.d' to display the effective config.