void netdgramconn(struct socket *sk, struct sockaddr *addr, socklen_t addrlen);
int sockgetlocalname(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf);
int sockgetremotename(struct socket *sk, struct sockaddr **namebuf, socklen_t *lenbuf);
+int sockgetremotename2(struct socket *sk, struct socket *sk2, struct sockaddr **namebuf, socklen_t *lenbuf);
void closesock(struct socket *sk);
void *sockgetinbuf(struct socket *sk, size_t *size);
struct socket *wrapsock(int fd);