#include <netdb.h> /* hostent */
int get_host_info(char *host, struct hostent **ret);
-int get_socket(void);
+int get_stream_socket(int domain);
void init_sockaddr(struct sockaddr_in*, int, const struct hostent*);
-int para_connect(int, struct sockaddr_in *);
+int para_connect(int fd, struct sockaddr_in *their_addr);
int send_buffer(int, const char *);
int send_bin_buffer(int, const char *, size_t);
__printf_2_3 int send_va_buffer(int fd, const char *fmt, ...);