node_exporter/collector/sysctl_openbsd_amd64.go
ston1th bdba65df16 skip null bytes at the end of strings
Signed-off-by: ston1th <ston1th@giftfish.de>
2020-11-12 23:37:57 +01:00

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
}