int para_connect(int, struct sockaddr_in *);
int send_buffer(int, const char *);
int send_bin_buffer(int, const char *, size_t);
-int send_va_buffer(int, char *, ...);
+int send_va_buffer(int, const char *, ...);
int recv_buffer(int, char *, ssize_t);
int recv_bin_buffer(int, char *, ssize_t);
int para_accept(int, void *addr, socklen_t size);