mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-30 07:59:53 -08:00
87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
// Copyright 2020 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package collector
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import (
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"golang.org/x/sys/unix"
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"syscall"
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"unsafe"
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)
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func int8ToString(a []int8) string {
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buf := make([]byte, len(a))
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for i, v := range a {
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if byte(v) == 0 {
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buf = buf[:i]
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break
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}
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buf[i] = byte(v)
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}
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return string(buf)
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}
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// unix._C_int
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type _C_int int32
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var _zero uintptr
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func errnoErr(e syscall.Errno) error {
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switch e {
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case 0:
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return nil
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case unix.EAGAIN:
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return syscall.EAGAIN
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case unix.EINVAL:
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return syscall.EINVAL
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case unix.ENOENT:
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return syscall.ENOENT
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}
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return e
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}
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func _sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {
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var _p0 unsafe.Pointer
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if len(mib) > 0 {
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_p0 = unsafe.Pointer(&mib[0])
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} else {
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_p0 = unsafe.Pointer(&_zero)
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}
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for {
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_, _, 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))
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if e1 != 0 {
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err = errnoErr(e1)
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}
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if err != unix.EINTR {
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return
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}
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}
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return
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}
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func sysctl(mib []_C_int) ([]byte, error) {
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n := uintptr(0)
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if err := _sysctl(mib, nil, &n, nil, 0); err != nil {
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return nil, err
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}
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if n == 0 {
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return nil, nil
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}
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buf := make([]byte, n)
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if err := _sysctl(mib, &buf[0], &n, nil, 0); err != nil {
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return nil, err
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}
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return buf[:n], nil
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}
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