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// Copyright 2019 The Prometheus Authors
// 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.
//go:build linux
// +build linux
package sysfs
import (
"path/filepath"
"strings"
"github.com/prometheus/procfs/internal/util"
)
// ClockSource contains metrics related to the clock source.
type ClockSource struct {
Name string
Available []string
Current string
}
// ClockSources returns clocksource information including current and available clocksources
// read from '/sys/devices/system/clocksource'.
func (fs FS) ClockSources() ([]ClockSource, error) {
clocksourcePaths, err := filepath.Glob(fs.sys.Path("devices/system/clocksource/clocksource[0-9]*"))
if err != nil {
return nil, err
}
clocksources := make([]ClockSource, len(clocksourcePaths))
for i, clocksourcePath := range clocksourcePaths {
clocksourceName := strings.TrimPrefix(filepath.Base(clocksourcePath), "clocksource")
clocksource, err := parseClocksource(clocksourcePath)
if err != nil {
return nil, err
}
clocksource.Name = clocksourceName
clocksources[i] = *clocksource
}
return clocksources, nil
}
func parseClocksource(clocksourcePath string) (*ClockSource, error) {
stringFiles := []string{
"available_clocksource",
"current_clocksource",
}
stringOut := make([]string, len(stringFiles))
var err error
for i, f := range stringFiles {
stringOut[i], err = util.SysReadFile(filepath.Join(clocksourcePath, f))
if err != nil {
return &ClockSource{}, err
}
}
return &ClockSource{
Available: strings.Fields(stringOut[0]),
Current: stringOut[1],
}, nil
}
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