extern void soisconnecting(struct socket *so);
extern void soisdisconnected(struct socket *so);
extern void soisdisconnecting(struct socket *so);
+extern int soisbackground(struct socket *so);
extern int solisten(struct socket *so, int backlog);
extern struct socket *sodropablereq(struct socket *head);
extern struct socket *sonewconn(struct socket *head, int connstatus,