sctp_disconnect
extern int sctp_disconnect(struct sctp_s *conn);
error = sctp_disconnect(ssa->ssa_conn);
error = sctp_disconnect((struct sctp_s *)so->so_proto_handle);
(void) sctp_disconnect((struct sctp_s *)so->so_proto_handle);
(void) sctp_disconnect(ssa->ssa_conn);
error = sctp_disconnect(
(void) sctp_disconnect(ssa->ssa_conn);