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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| package link | ||
|
|
||
| import ( | ||
| "errors" | ||
| ) | ||
|
|
||
| var ( | ||
| ErrUnsupported = errors.New("not supported arch") | ||
| ErrNotFound = errors.New("not found") | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| // 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" | ||
| ) | ||
|
|
||
| // Setting represents a sysctl setting. Its purpose it to be able to iterate | ||
| // over a slice of settings. | ||
| type Setting struct { | ||
| Name string | ||
| Val string | ||
| IgnoreErr bool | ||
| } | ||
|
|
||
| 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 | ||
| } |
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