// Freeze toggles the container's freezer cgroup depending on the state
// provided
func (m *Manager) Freeze(state configs.FreezerState) error {
d, err := getCgroupData(m.Cgroups, 0)
if err != nil {
return err
}
dir, err := d.path("freezer")
if err != nil {
return err
}
if !cgroups.PathExists(dir) {
return cgroups.NewNotFoundError("freezer")
}
prevState := m.Cgroups.Freezer
m.Cgroups.Freezer = state
freezer := subsystems["freezer"]
err = freezer.Set(dir, m.Cgroups)
if err != nil {
m.Cgroups.Freezer = prevState
return err
}
return nil
}
func (m *Manager) GetPids() ([]int, error) {
d, err := getCgroupData(m.Cgroups, 0)
if err != nil {
return nil, err
}
dir, err := d.path("devices")
if err != nil {
return nil, err
}
if !cgroups.PathExists(dir) {
return nil, cgroups.NewNotFoundError("devices")
}
return cgroups.ReadProcsFile(dir)
}
func (raw *data) path(subsystem string) (string, error) {
// If the cgroup name/path is absolute do not look relative to the cgroup of the init process.
if filepath.IsAbs(raw.cgroup) {
path := filepath.Join(raw.root, subsystem, raw.cgroup)
if _, err := os.Stat(path); err != nil {
if os.IsNotExist(err) {
return "", cgroups.NewNotFoundError(subsystem)
}
return "", err
}
return path, nil
}
parent, err := raw.parent(subsystem)
if err != nil {
return "", err
}
return filepath.Join(parent, raw.cgroup), nil
}