Method AddPid

pkg/cgroups/cgroups.go:587–620

AddPid moves the specified pid to the cgroup

(pid int)

// AddPid moves the specified pid to the cgroup
func (c *CgroupControl) AddPid(pid int) error {
	pidString := []byte(fmt.Sprintf("%d\n", pid))

	if c.cgroup2 {
		p := filepath.Join(cgroupRoot, c.path, "cgroup.procs")
		if err := ioutil.WriteFile(p, pidString, 0644); err != nil {
			return errors.Wrapf(err, "write %s", p)
		}
		return nil
	}

	names := make([]string, 0, len(handlers))
	for n := range handlers {
		names = append(names, n)
	}

	for _, c := range c.additionalControllers {
		if !c.symlink {
			names = append(names, c.name)
		}
	}

	for _, n := range names {
		// If we aren't using cgroup2, we won't write correctly to unified hierarchy
		if !c.cgroup2 && n == "unified" {
			continue
		}
		p := filepath.Join(c.getCgroupv1Path(n), "tasks")
		if err := ioutil.WriteFile(p, pidString, 0644); err != nil {
			return errors.Wrapf(err, "write %s", p)
		}
	}
	return nil
}

// Stat returns usage statistics for the cgroup
func (c *CgroupControl) Stat() (*Metrics, error) {