slp_sign
err = slp_sign(&((*msg)->urlbytes), 1, ts,
err = slp_sign(&((*msg)->attrbytes), 1, ts,
err = slp_sign(&((*msg)->urlbytes), 1, 0,
(void) slp_sign(&(p->msg->urlbytes), 1, now + p->lifetime,
(void) slp_sign(&(p->msg->attrbytes), 1, now + p->lifetime,
extern SLPError slp_sign(struct iovec *, int, time_t, struct iovec *, int);