}
			// FIXME: should probably check file length and hash here for
			// the duplicate.
		}
	}
	counterRE := regexp.MustCompile(fmt.Sprintf(coverage.CounterFileRegexp, coverage.CounterFilePref))
	for k, f := range files {
		base := filepath.Base(f)
		if m := counterRE.FindStringSubmatch(base); m != nil {
			tag := m[1] // meta hash
			pid, err := strconv.Atoi(m[2])
			if err != nil {
				continue