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// Copyright 2015 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.
// +build !noloadavg
package collector
import (
"fmt"
"strconv"
"github.com/siebenmann/go-kstat"
)
// #include <sys/param.h>
import "C"
func kstatToFloat(ks *kstat.KStat, kstatKey string) float64 {
kstatValue, err := ks.GetNamed(kstatKey)
if err != nil {
panic(err)
}
kstatLoadavg, err := strconv.ParseFloat(
fmt.Sprintf("%.2f", float64(kstatValue.UintVal)/C.FSCALE), 64)
if err != nil {
panic(err)
}
return kstatLoadavg
}
func getLoad() ([]float64, error) {
tok, err := kstat.Open()
if err != nil {
panic(err)
}
defer tok.Close()
ks, err := tok.Lookup("unix", 0, "system_misc")
if err != nil {
panic(err)
}
loadavg1Min := kstatToFloat(ks, "avenrun_1min")
loadavg5Min := kstatToFloat(ks, "avenrun_5min")
loadavg15Min := kstatToFloat(ks, "avenrun_15min")
return []float64{loadavg1Min, loadavg5Min, loadavg15Min}, nil
}
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