int accept(int s, struct sockaddr *addr, socklen_t *addrlen);
int shutdown(int s, int how);
int connect(int s, const struct sockaddr *name, socklen_t namelen);
int accept(int s, struct sockaddr *addr, socklen_t *addrlen);
int shutdown(int s, int how);
int connect(int s, const struct sockaddr *name, socklen_t namelen);
int recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen);
int sendto(int s, const void *msg, size_t len, int flags, const struct sockaddr *to, socklen_t tolen);
int select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);
int recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen);
int sendto(int s, const void *msg, size_t len, int flags, const struct sockaddr *to, socklen_t tolen);
int select(int n, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);