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package cgroups
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
spec "github.com/opencontainers/runtime-spec/specs-go"
)
type pidHandler struct {
}
func getPidsHandler() *pidHandler {
return &pidHandler{}
}
// Apply set the specified constraints
func (c *pidHandler) Apply(ctr *CgroupControl, res *spec.LinuxResources) error {
if res.Pids == nil {
return nil
}
var PIDRoot string
if ctr.cgroup2 {
PIDRoot = filepath.Join(cgroupRoot, ctr.path)
} else {
PIDRoot = ctr.getCgroupv1Path(Pids)
}
p := filepath.Join(PIDRoot, "pids.max")
return ioutil.WriteFile(p, []byte(fmt.Sprintf("%d\n", res.Pids.Limit)), 0644)
}
// Create the cgroup
func (c *pidHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
return false, fmt.Errorf("pid create not implemented for cgroup v2")
}
return ctr.createCgroupDirectory(Pids)
}
// Destroy the cgroup
func (c *pidHandler) Destroy(ctr *CgroupControl) error {
return os.Remove(ctr.getCgroupv1Path(Pids))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *pidHandler) Stat(ctr *CgroupControl, m *Metrics) error {
var PIDRoot string
if ctr.cgroup2 {
PIDRoot = filepath.Join(cgroupRoot, ctr.path)
} else {
PIDRoot = ctr.getCgroupv1Path(Pids)
}
current, err := readFileAsUint64(filepath.Join(PIDRoot, "pids.current"))
if err != nil {
return err
}
m.Pids = PidsMetrics{Current: current}
return nil
}
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