void
xfwrite (const void *ptr, size_t size, size_t nmemb, FILE *stream);
+int
+xsocket (int domain, int type, int protocol);
+
+void
+xbind (int sockfd, const struct sockaddr *my_addr, socklen_t addrlen);
+
+void
+xlisten (int s, int backlog);
+
+int
+xfcntl (int fd, int cmd, long arg);
+
+int
+xselect (int n,
+ fd_set *readfds,
+ fd_set *writefds,
+ fd_set *exceptfds,
+ struct timeval *timeout);
+
#endif /* _X_H_ */