u_int8_t tcp_tos _P((struct socket *));
int tcp_emu _P((struct socket *, struct mbuf *));
int tcp_ctl _P((struct socket *));
-struct tcpcb *tcp_drop(struct tcpcb *tp, int errno);
+struct tcpcb *tcp_drop(struct tcpcb *tp, int err);
#ifdef USE_PPP
#define MIN_MRU MINMRU