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 } 46