node_exporter/collector/boot_time_openbsd_amd64.go

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// Copyright 2020 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 !noboottime
package collector
import (
"github.com/go-kit/kit/log"
"github.com/prometheus/client_golang/prometheus"
"golang.org/x/sys/unix"
"unsafe"
)
type bootTimeCollector struct {
name, description string
logger log.Logger
}
func init() {
registerCollector("boottime", defaultEnabled, newBootTimeCollector)
}
// newBootTimeCollector returns a new Collector exposing system boot time on BSD systems.
func newBootTimeCollector(logger log.Logger) (Collector, error) {
return &bootTimeCollector{
name: "boot_time_seconds",
description: "Unix time of last boot, including microseconds.",
logger: logger,
}, nil
}
// Update pushes boot time onto ch
func (c *bootTimeCollector) Update(ch chan<- prometheus.Metric) error {
raw, err := unix.SysctlRaw("kern.boottime")
if err != nil {
return err
}
tv := *(*unix.Timeval)(unsafe.Pointer(&raw[0]))
v := (float64(tv.Sec) + (float64(tv.Usec) / float64(1000*1000)))
ch <- prometheus.MustNewConstMetric(
prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", c.name),
c.description,
nil, nil,
), prometheus.GaugeValue, v)
return nil
}