R_SENT
rep->r_flags &= ~R_SENT;
if ((rep->r_flags & R_SENT) == 0) {
rep->r_flags |= R_SENT;
if (rep->r_flags & R_SENT) {
rep->r_flags &= ~R_SENT; /* paranoia */
(rep->r_flags & R_SENT) ||
if (rep->r_flags & R_SENT) {
rep->r_flags |= R_SENT;