int get_socket_error(int sock);
int check_connection_completion(int fd);
int drain_rcvbuf(int fd);
+void drain_fd(int fd, size_t n_packets);
int make_unix_socket(int style, bool nonblock, bool passcred,
const char *bind_path, const char *connect_path);
int get_unix_name_len(socklen_t sun_len);