runc/libcontainer/cgroups/fs/freezer_v2.go

75 lines
1.6 KiB
Go

// +build linux
package fs
import (
"fmt"
"strings"
"time"
"github.com/opencontainers/runc/libcontainer/cgroups"
"github.com/opencontainers/runc/libcontainer/configs"
)
type FreezerGroupV2 struct {
}
func (s *FreezerGroupV2) Name() string {
return "freezer"
}
func (s *FreezerGroupV2) Apply(d *cgroupData) error {
_, err := d.join("freezer")
if err != nil && !cgroups.IsNotFound(err) {
return err
}
return nil
}
func (s *FreezerGroupV2) Set(path string, cgroup *configs.Cgroup) error {
var desiredState string
filename := "cgroup.freeze"
if cgroup.Resources.Freezer == configs.Frozen {
desiredState = "1"
} else {
desiredState = "0"
}
switch cgroup.Resources.Freezer {
case configs.Frozen, configs.Thawed:
for {
// In case this loop does not exit because it doesn't get the expected
// state, let's write again this state, hoping it's going to be properly
// set this time. Otherwise, this loop could run infinitely, waiting for
// a state change that would never happen.
if err := writeFile(path, filename, desiredState); err != nil {
return err
}
state, err := readFile(path, filename)
if err != nil {
return err
}
if strings.TrimSpace(state) == desiredState {
break
}
time.Sleep(1 * time.Millisecond)
}
case configs.Undefined:
return nil
default:
return fmt.Errorf("Invalid argument '%s' to freezer.state", string(cgroup.Resources.Freezer))
}
return nil
}
func (s *FreezerGroupV2) Remove(d *cgroupData) error {
return removePath(d.path("freezer"))
}
func (s *FreezerGroupV2) GetStats(path string, stats *cgroups.Stats) error {
return nil
}