mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-23 12:30:46 +01:00
87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
// Copyright 2020 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package collector
|
|
|
|
import (
|
|
"golang.org/x/sys/unix"
|
|
"syscall"
|
|
"unsafe"
|
|
)
|
|
|
|
func int8ToString(a []int8) string {
|
|
buf := make([]byte, len(a))
|
|
for i, v := range a {
|
|
if byte(v) == 0 {
|
|
buf = buf[:i]
|
|
break
|
|
}
|
|
buf[i] = byte(v)
|
|
}
|
|
return string(buf)
|
|
}
|
|
|
|
// unix._C_int
|
|
type _C_int int32
|
|
|
|
var _zero uintptr
|
|
|
|
func errnoErr(e syscall.Errno) error {
|
|
switch e {
|
|
case 0:
|
|
return nil
|
|
case unix.EAGAIN:
|
|
return syscall.EAGAIN
|
|
case unix.EINVAL:
|
|
return syscall.EINVAL
|
|
case unix.ENOENT:
|
|
return syscall.ENOENT
|
|
}
|
|
return e
|
|
}
|
|
|
|
func _sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {
|
|
var _p0 unsafe.Pointer
|
|
if len(mib) > 0 {
|
|
_p0 = unsafe.Pointer(&mib[0])
|
|
} else {
|
|
_p0 = unsafe.Pointer(&_zero)
|
|
}
|
|
for {
|
|
_, _, e1 := unix.Syscall6(unix.SYS___SYSCTL, uintptr(_p0), uintptr(len(mib)), uintptr(unsafe.Pointer(old)), uintptr(unsafe.Pointer(oldlen)), uintptr(unsafe.Pointer(new)), uintptr(newlen))
|
|
if e1 != 0 {
|
|
err = errnoErr(e1)
|
|
}
|
|
if err != unix.EINTR {
|
|
return
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func sysctl(mib []_C_int) ([]byte, error) {
|
|
n := uintptr(0)
|
|
if err := _sysctl(mib, nil, &n, nil, 0); err != nil {
|
|
return nil, err
|
|
}
|
|
if n == 0 {
|
|
return nil, nil
|
|
}
|
|
|
|
buf := make([]byte, n)
|
|
if err := _sysctl(mib, &buf[0], &n, nil, 0); err != nil {
|
|
return nil, err
|
|
}
|
|
return buf[:n], nil
|
|
}
|