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//go:build linux
// +build linux
package cgroups
import (
"path/filepath"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/cgroups/fs"
"github.com/opencontainers/runc/libcontainer/cgroups/fs2"
"github.com/opencontainers/runc/libcontainer/configs"
)
type linuxPidHandler struct {
Pid fs.PidsGroup
}
func getPidsHandler() *linuxPidHandler {
return &linuxPidHandler{}
}
// Apply set the specified constraints
func (c *linuxPidHandler) Apply(ctr *CgroupControl, res *configs.Resources) error {
if ctr.cgroup2 {
man, err := fs2.NewManager(ctr.config, filepath.Join(cgroupRoot, ctr.config.Path))
if err != nil {
return err
}
return man.Set(res)
}
path := filepath.Join(cgroupRoot, Pids, ctr.config.Path)
return c.Pid.Set(path, res)
}
// Create the cgroup
func (c *linuxPidHandler) Create(ctr *CgroupControl) (bool, error) {
if ctr.cgroup2 {
return false, nil
}
return ctr.createCgroupDirectory(Pids)
}
// Destroy the cgroup
func (c *linuxPidHandler) Destroy(ctr *CgroupControl) error {
return rmDirRecursively(ctr.getCgroupv1Path(Pids))
}
// Stat fills a metrics structure with usage stats for the controller
func (c *linuxPidHandler) Stat(ctr *CgroupControl, m *cgroups.Stats) error {
if ctr.config.Path == "" {
// nothing we can do to retrieve the pids.current path
return nil
}
var PIDRoot string
if ctr.cgroup2 {
PIDRoot = filepath.Join(cgroupRoot, ctr.config.Path)
} else {
PIDRoot = ctr.getCgroupv1Path(Pids)
}
current, err := readFileAsUint64(filepath.Join(PIDRoot, "pids.current"))
if err != nil {
return err
}
m.PidsStats.Current = current
return nil
}
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