Function NewSystemd

cgroup2/manager.go:944–1043

(slice, group string, pid int, resources *Resources)

}

func NewSystemd(slice, group string, pid int, resources *Resources) (*Manager, error) {
	if slice == "" {
		slice = defaultSlice
	}
	ctx := context.TODO()
	path := getSystemdFullPath(slice, group)
	conn, err := systemdDbus.NewWithContext(ctx)
	if err != nil {
		return &Manager{}, err
	}
	defer conn.Close()

	properties := []systemdDbus.Property{
		systemdDbus.PropDescription("cgroup " + group),
		newSystemdProperty("DefaultDependencies", false),
		newSystemdProperty("MemoryAccounting", true),
		newSystemdProperty("CPUAccounting", true),
		newSystemdProperty("IOAccounting", true),
	}

	// if we create a slice, the parent is defined via a Wants=
	if strings.HasSuffix(group, ".slice") {
		properties = append(properties, systemdDbus.PropWants(defaultSlice))
	} else {
		// otherwise, we use Slice=
		properties = append(properties, systemdDbus.PropSlice(defaultSlice))
	}

	// only add pid if its valid, -1 is used w/ general slice creation.
	if pid != -1 {
		properties = append(properties, newSystemdProperty("PIDs", []uint32{uint32(pid)}))
	}

	if resources.Memory != nil && resources.Memory.Min != nil && *resources.Memory.Min != 0 {
		properties = append(properties,
			newSystemdProperty("MemoryMin", uint64(*resources.Memory.Min)))
	}

	if resources.Memory != nil && resources.Memory.Max != nil && *resources.Memory.Max != 0 {
		properties = append(properties,
			newSystemdProperty("MemoryMax", uint64(*resources.Memory.Max)))
	}

	if resources.CPU != nil && resources.CPU.Weight != nil && *resources.CPU.Weight != 0 {
		properties = append(properties,
			newSystemdProperty("CPUWeight", *resources.CPU.Weight))
	}

	if resources.CPU != nil && resources.CPU.Max != "" {
		quota, period, err := resources.CPU.Max.extractQuotaAndPeriod()
		if err != nil {
			return &Manager{}, err
		}

		if period != 0 {
			if sdVer := systemdVersion(conn); sdVer >= cpuQuotaPeriodUSecSupportedVersion {
				properties = append(properties, newSystemdProperty("CPUQuotaPeriodUSec", period))
			} else {