openusb_init, openusb_fini
-- Initialize or destroy a libopenusb instanceopenusb_set_debug
-- Set debug informationopenusb_set_event_callback, openusb_coldplug_callbacks_done
-- Set event callbacks or Waiting for coldplug events completionopenusb_set_default_timeout
-- Set default timeout for USB transferThese functions comprise the core of Openusb. They are used by all applications that utilize libopenusb.