k8s.io/kubernetes@v1.29.3/pkg/kubelet/util/boottime_util_darwin.go (about)

     1  //go:build darwin
     2  // +build darwin
     3  
     4  /*
     5  Copyright 2018 The Kubernetes Authors.
     6  
     7  Licensed under the Apache License, Version 2.0 (the "License");
     8  you may not use this file except in compliance with the License.
     9  You may obtain a copy of the License at
    10  
    11      http://www.apache.org/licenses/LICENSE-2.0
    12  
    13  Unless required by applicable law or agreed to in writing, software
    14  distributed under the License is distributed on an "AS IS" BASIS,
    15  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16  See the License for the specific language governing permissions and
    17  limitations under the License.
    18  */
    19  
    20  package util
    21  
    22  import (
    23  	"fmt"
    24  	"syscall"
    25  	"time"
    26  	"unsafe"
    27  
    28  	"golang.org/x/sys/unix"
    29  )
    30  
    31  // GetBootTime returns the time at which the machine was started, truncated to the nearest second
    32  func GetBootTime() (time.Time, error) {
    33  	output, err := unix.SysctlRaw("kern.boottime")
    34  	if err != nil {
    35  		return time.Time{}, err
    36  	}
    37  	var timeval syscall.Timeval
    38  	if len(output) != int(unsafe.Sizeof(timeval)) {
    39  		return time.Time{}, fmt.Errorf("unexpected output when calling syscall kern.bootime.  Expected len(output) to be %v, but got %v",
    40  			int(unsafe.Sizeof(timeval)), len(output))
    41  	}
    42  	timeval = *(*syscall.Timeval)(unsafe.Pointer(&output[0]))
    43  	sec, nsec := timeval.Unix()
    44  	return time.Unix(sec, nsec).Truncate(time.Second), nil
    45  }