func getReferencedKBytes()

in container/libcontainer/handler.go [388:431]
41 lines of code
11 McCabe index (conditional complexity)

func getReferencedKBytes(pids []int) (uint64, error) {
	referencedKBytes := uint64(0)
	readSmapsContent := false
	foundMatch := false
	for _, pid := range pids {
		smapsFilePath := fmt.Sprintf(smapsFilePathPattern, pid)
		smapsContent, err := os.ReadFile(smapsFilePath)
		if err != nil {
			klog.V(5).Infof("Cannot read %s file, err: %s", smapsFilePath, err)
			if os.IsNotExist(err) {
				continue // smaps file does not exists for all PIDs
			}
			return 0, err
		}
		readSmapsContent = true

		allMatches := referencedRegexp.FindAllSubmatch(smapsContent, -1)
		if len(allMatches) == 0 {
			klog.V(5).Infof("Not found any information about referenced bytes in %s file", smapsFilePath)
			continue // referenced bytes may not exist in smaps file
		}

		for _, matches := range allMatches {
			if len(matches) != 2 {
				return 0, fmt.Errorf("failed to match regexp in output: %s", string(smapsContent))
			}
			foundMatch = true
			referenced, err := strconv.ParseUint(string(matches[1]), 10, 64)
			if err != nil {
				return 0, err
			}
			referencedKBytes += referenced
		}
	}

	if len(pids) != 0 {
		if !readSmapsContent {
			klog.Warningf("Cannot read smaps files for any PID from %s", "CONTAINER")
		} else if !foundMatch {
			klog.Warningf("Not found any information about referenced bytes in smaps files for any PID from %s", "CONTAINER")
		}
	}
	return referencedKBytes, nil
}