state.go

Documentation: github.com/containerd/cgroups/v2

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package v2
    18  
    19  import (
    20  	"os"
    21  	"path/filepath"
    22  	"strings"
    23  )
    24  
    25  // State is a type that represents the state of the current cgroup
    26  type State string
    27  
    28  const (
    29  	Unknown State = ""
    30  	Thawed  State = "thawed"
    31  	Frozen  State = "frozen"
    32  	Deleted State = "deleted"
    33  
    34  	cgroupFreeze = "cgroup.freeze"
    35  )
    36  
    37  func (s State) Values() []Value {
    38  	v := Value{
    39  		filename: cgroupFreeze,
    40  	}
    41  	switch s {
    42  	case Frozen:
    43  		v.value = "1"
    44  	case Thawed:
    45  		v.value = "0"
    46  	}
    47  	return []Value{
    48  		v,
    49  	}
    50  }
    51  
    52  func fetchState(path string) (State, error) {
    53  	current, err := os.ReadFile(filepath.Join(path, cgroupFreeze))
    54  	if err != nil {
    55  		return Unknown, err
    56  	}
    57  	switch strings.TrimSpace(string(current)) {
    58  	case "1":
    59  		return Frozen, nil
    60  	case "0":
    61  		return Thawed, nil
    62  	default:
    63  		return Unknown, nil
    64  	}
    65  }
    66
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