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ShengYi Hung
749318f2ae
FreeBSD's libusb has three components: libusb01, libusb10, and libusb20. libusb20 handles communication with character devices. We now requires a backend context for libusb20. The backend context contains contains the capsicumized usbctrl fd and usb directory (/dev/usb) fd so that the library user can enter the capiblity mode safely while using libusb. libusb10 is updated to support capabilities via a context option. Since libusb allows general read/write access, we preserve all possible capabilities when passing backend context to libusb20. It is the responsibility of the libusb user to call cap_enter() at an appropriate time. All base system tools using libusb and libusb20 have been updated to support Capsicum. Reviewed by: adrian, markj Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D51865