message: added swoole_string_format and swSocket_create_server
diff: @@ -1237,8 +1237,10 @@ void swoole_print_trace(void);
  void swoole_ioctl_set_block(int sock, int nonblock);
  void swoole_fcntl_set_option(int sock, int nonblock, int cloexec);
  int swoole_gethostbyname(int type, char *name, char *addr);
  +char* swoole_string_format(size_t n, const char *format, ...);
  //----------------------core function---------------------
  int swSocket_set_timeout(int sock, double timeout);
  +int swSocket_create_server(int type, char *address, int port, int backlog);
  //----------------------------------------Socket---------------------------------------
  static sw_inline int swSocket_is_dgram(uint8_t type)
  {
  