mirror of
https://github.com/kubernetes/node-problem-detector.git
synced 2026-03-02 09:40:29 +00:00
80 lines
2.6 KiB
Go
80 lines
2.6 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package system
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import (
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"encoding/json"
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"fmt"
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"strconv"
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"strings"
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)
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type Module struct {
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ModuleName string `json:"moduleName"`
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Instances uint64 `json:"instances"`
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Proprietary bool `json:"proprietary"`
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OutOfTree bool `json:"outOfTree"`
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Unsigned bool `json:"unsigned"`
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}
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func (d Module) String() string {
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s, _ := json.Marshal(d)
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return string(s)
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}
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// Module returns all the kernel modules and their
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// usage. It is read from cat /proc/modules.
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func Modules(modulesFilePath string) ([]Module, error) {
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lines, err := ReadFileIntoLines(modulesFilePath)
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if err != nil {
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return nil, fmt.Errorf("error reading the contents of %s: %s", modulesFilePath, err)
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}
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var result = make([]Module, 0, len(lines))
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/* a line of /proc/modules has the following structure
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nf_nat 61440 2 xt_MASQUERADE,iptable_nat, Live 0x0000000000000000 (O)
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(1) (2) (3) (4) (5) (6) (7)
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(1) name of the module
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(2) memory size of the module, in bytes
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(3) instances of the module are currently loaded
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(4) module dependencies
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(5) load state of the module: live, loading or unloading
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(6) memory offset for the loaded module.
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(7) return a string to represent the kernel taint state. (used here: "P" - Proprietary, "O" - out of tree kernel module, "E" - unsigned module
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*/
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for _, line := range lines {
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fields := strings.Fields(line)
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moduleName := fields[0] // name of the module
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numberOfInstances, err :=
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strconv.ParseUint((fields[2]), 10, 64) // instances of the module are currently loaded
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if err != nil {
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numberOfInstances = 0
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}
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var module = Module{
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ModuleName: moduleName,
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Instances: numberOfInstances,
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}
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// if the len of the fields is greater than 6, then the kernel taint state is available.
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if len(fields) > 6 {
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module.Proprietary = strings.Contains(fields[6], "P")
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module.OutOfTree = strings.Contains(fields[6], "O")
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module.Unsigned = strings.Contains(fields[6], "E")
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}
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result = append(result, module)
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}
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return result, nil
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}
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