Final answer:
After the udevd daemon initiates a hotplug device, it generally creates or removes device nodes, modifies permissions, and triggers other processes or scripts as defined by the rules in /etc/udev/rules.d to integrate the device into the system.
Step-by-step explanation:
When a hotplug device is added or removed, the kernel indeed sends out a uevent message. The udevd daemon picks up this message and responds to it based on the rules defined in the /etc/udev/rules.d directory. After initiating the device, udevd generally performs several actions. It may create or remove device files, also known as nodes, in the /dev directory. It can change permissions and ownerships of these files according to the specified rules. Udevd may also trigger other system processes or scripts that are meant to perform additional configurations required for the device to operate correctly within the system. The workload for udevd is essentially to ensure that devices are set up correctly and seamlessly integrated into the system without requiring manual intervention from the user.