ub_ctx_create
ub_ctx_delete
ub_ctx_set_option
ub_ctx_config
ub_ctx_set_fwd
ub_ctx_resolvconf
ub_ctx_hosts
ub_ctx_add_ta
ub_ctx_add_ta_file
ub_ctx_trustedkeys
ub_ctx_debugout
ub_ctx_debuglevel
ub_ctx_async
ub_poll
ub_wait
ub_fd
ub_process
ub_resolve
ub_resolve_async
ub_cancel
ub_resolve_free
ub_strerror