code: func IsTerminal(fd uintptr) bool {
  	var termios syscall.Termios
  	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
  	return err == 0
  }
docs: // IsTerminal return true if the file descriptor is terminal.