code: func logName(logger, tag string, t time.Time) (name, link string) {
  	name = fmt.Sprintf("%s.%s.%s.log.%s.%s.%04d%02d%02d-%02d%02d%02d.%d",
  		program,
  		host,
  		userName,
  		logger,
  		tag,
  		t.Year(),
  		t.Month(),
  		t.Day(),
  		t.Hour(),
  		t.Minute(),
  		t.Second(),
  		pid)
  	return name, program + "." + tag
  }
docs: // logName returns a new log file name containing tag, with start time t, and
  // the name for the symlink for tag.