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45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
// +build darwin
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/*
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Copyright 2018 The Kubernetes 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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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 util
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import (
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"fmt"
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"syscall"
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"time"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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// GetBootTime returns the time at which the machine was started, truncated to the nearest second
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func GetBootTime() (time.Time, error) {
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output, err := unix.SysctlRaw("kern.boottime")
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if err != nil {
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return time.Time{}, err
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}
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var timeval syscall.Timeval
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if len(output) != int(unsafe.Sizeof(timeval)) {
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return time.Time{}, fmt.Errorf("unexpected output when calling syscall kern.bootime. Expected len(output) to be %v, but got %v",
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int(unsafe.Sizeof(timeval)), len(output))
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}
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timeval = *(*syscall.Timeval)(unsafe.Pointer(&output[0]))
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sec, nsec := timeval.Unix()
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return time.Unix(sec, nsec).Truncate(time.Second), nil
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}
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