The IOUSBLib Framework
The library used to write a user-space driver for a USB device is known as IOUSBLib, which is part of the I/O Kit framework (that is, the same framework a user-space application includes if it is communicating with a user client it defined itself).
The first task a user-space driver needs to perform is to watch for the arrival of the particular USB devices it is interested in. Since USB devices can be connected and disconnected from the computer at any time, there is no guarantee the device an application is interested in will be present when the application is launched. Therefore, it's a good idea for an application to install a notification callback that watches for the arrival of the USB devices it controls.
In Chapter ...
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