R_SENT
(rep->r_flags & R_SENT) ||
if (rep->r_flags & R_SENT) {
rep->r_flags |= R_SENT;
rep->r_flags &= ~R_SENT;
rep->r_flags |= R_SENT;
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT; /* paranoia */