SCTP_PARTIAL_DELIVERY_POINT
ret = setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval,
ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
case SCTP_PARTIAL_DELIVERY_POINT:
case SCTP_PARTIAL_DELIVERY_POINT: