mirror of
https://github.com/prometheus-community/windows_exporter.git
synced 2026-10-17 10:09:05 +02:00
64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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//
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// Copyright The Prometheus Authors
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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//go:build windows
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package ntdll
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import (
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"fmt"
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"time"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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// SystemTimeOfDayInformation is the SYSTEM_TIMEOFDAY_INFORMATION structure.
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// The times are in 100-nanosecond intervals since January 1, 1601 (UTC).
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type SystemTimeOfDayInformation struct {
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BootTime int64
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CurrentTime int64
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TimeZoneBias int64
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TimeZoneID uint32
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Reserved uint32
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BootTimeBias uint64
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SleepTimeBias uint64
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}
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// BootTime returns the time the system booted.
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//
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// The kernel moves the boot time along when the system time is set, so it
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// stays correct after a clock correction.
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func BootTime() (time.Time, error) {
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var info SystemTimeOfDayInformation
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err := windows.NtQuerySystemInformation(
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windows.SystemTimeOfDayInformation,
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unsafe.Pointer(&info),
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uint32(unsafe.Sizeof(info)),
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nil,
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)
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if err != nil {
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return time.Time{}, fmt.Errorf("NtQuerySystemInformation(SystemTimeOfDayInformation): %w", err)
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}
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ft := windows.Filetime{
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LowDateTime: uint32(info.BootTime),
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HighDateTime: uint32(info.BootTime >> 32),
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}
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return time.Unix(0, ft.Nanoseconds()), nil
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}
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