Improving USB userland tools and ioctl(2)

by ludovic coues for The OpenBSD Foundation

This project aim to make the OpenBSD USB userland more consistent, simpler to use and deliver a unified tool to view attached usb device, usbdump(8). Currently, OpenBSD USB userland interface are opaque system call. We don't know what happen without reading the code, especially if they generate I/O. This cause problem with library like libusb which shouldn't cause I/O. Caching static data should fix this problem and suppress the need of system call for reading static data.