Hardware hotplug events on Linux, the gory details

18 hours ago

Linux hardware hotplug events can be detected using libusb, but alternative methods exist for specific use cases.
udev is a system component that handles device events in Linux, recommended over direct netlink usage to avoid race conditions.
Netlink is a Linux-specific protocol for kernel-userspace communication, supporting multicast for event broadcasting.
Example code demonstrates listening to kernel and udev events via netlink sockets, including parsing udev's packet format.
udev's packet format includes a header with magic numbers, property offsets, and hashes for filtering (subsystem, devtype, tags).
Security considerations include verifying message credentials to prevent spoofing, with kernel messages having zeroed credentials.

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