/
modules_linux.go
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/
modules_linux.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 modules
import (
"bufio"
"fmt"
"io"
"os"
"strings"
)
const (
modulesFilepath = "/proc/modules"
)
func moduleLoader() string {
return "modprobe"
}
// parseModulesFile returns the list of loaded kernel modules names.
func parseModulesFile(r io.Reader) ([]string, error) {
var result []string
scanner := bufio.NewScanner(r)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
moduleInfoRaw := scanner.Text()
moduleInfoSeparated := strings.Split(moduleInfoRaw, " ")
if len(moduleInfoSeparated) < 6 {
return nil, fmt.Errorf(
"invalid module info - it has %d fields (less than 6): %s",
len(moduleInfoSeparated), moduleInfoRaw)
}
result = append(result, moduleInfoSeparated[0])
}
return result, nil
}
// listModules returns the list of loaded kernel modules names parsed from
// /proc/modules.
func listModules() ([]string, error) {
fModules, err := os.Open(modulesFilepath)
if err != nil {
return nil, fmt.Errorf(
"failed to open modules information at %s: %s",
modulesFilepath, err)
}
defer fModules.Close()
return parseModulesFile(fModules)
}