1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package sysinfo
import (
"syscall"
"unsafe"
)
// PhysicalMemoryBytes returns the total amount of host memory.
func PhysicalMemoryBytes() (uint64, error) {
mib := []int32{6 /* CTL_HW */, 5 /* HW_PHYSMEM */}
buf := make([]byte, 8)
bufLen := uintptr(8)
_, _, e1 := syscall.Syscall6(syscall.SYS___SYSCTL,
uintptr(unsafe.Pointer(&mib[0])), uintptr(len(mib)),
uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&bufLen)),
uintptr(0), uintptr(0))
if e1 != 0 {
return 0, e1
}
switch bufLen {
case 4:
return uint64(*(*uint32)(unsafe.Pointer(&buf[0]))), nil
case 8:
return *(*uint64)(unsafe.Pointer(&buf[0])), nil
default:
return 0, syscall.EIO
}
}
|
