__tun_prn
__tun_prn(__tunnel, dbg, _kms, __fmt, ## __VA_ARGS__)
__tun_prn(__tunnel, dbg, _kms, __fmt " (Failed, err: %pe)\n", \
__tun_prn(__tunnel, dbg, _kms, __fmt " (Ok)\n", \
__tun_prn(__tunnel, dbg, _atomic, __fmt, ## __VA_ARGS__)