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sysctl.go
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sysctl.go
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// Copyright 2019 Authors of Cilium
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sysctl
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
const (
prefixDir = "/proc/sys"
)
func fullPath(name string) string {
return filepath.Join(prefixDir, strings.Replace(name, ".", "/", -1))
}
func writeSysctl(name string, value string) error {
fPath := fullPath(name)
f, err := os.OpenFile(fPath, os.O_RDWR, 0644)
if err != nil {
return fmt.Errorf("could not open the sysctl file %s: %s",
fPath, err)
}
defer f.Close()
if _, err := io.WriteString(f, value); err != nil {
return fmt.Errorf("could not write to the systctl file %s: %s",
fPath, err)
}
return nil
}
// Disable disables the given sysctl parameter.
func Disable(name string) error {
return writeSysctl(name, "0")
}
// Enable enables the given sysctl parameter.
func Enable(name string) error {
return writeSysctl(name, "1")
}
// Write writes the given sysctl parameter.
func Write(name string, val string) error {
return writeSysctl(name, val)
}
// Read reads the given sysctl parameter.
func Read(name string) (string, error) {
fPath := fullPath(name)
val, err := ioutil.ReadFile(fPath)
if err != nil {
return "", fmt.Errorf("Failed to read %s: %s", fPath, val)
}
return strings.TrimRight(string(val), "\n"), nil
}