mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-24 19:29:56 +01:00
143 lines
3.4 KiB
Go
143 lines
3.4 KiB
Go
// Copyright 2017 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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// +build freebsd dragonfly openbsd netbsd darwin
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// +build !nomeminfo
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package collector
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import (
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"fmt"
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"syscall"
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"unsafe"
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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/sys/unix"
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)
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// #include <sys/types.h>
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import "C"
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type bsdSysctlType uint8
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// BSD-specific sysctl value types. There is an impedience mismatch between
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// native C types, e.g. int vs long, and the golang unix.Sysctl variables
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const (
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// Default to uint32.
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bsdSysctlTypeUint32 bsdSysctlType = iota
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bsdSysctlTypeUint64
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bsdSysctlTypeStructTimeval
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bsdSysctlTypeCLong
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)
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// Contains all the info needed to map a single bsd-sysctl to a prometheus
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// value.
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type bsdSysctl struct {
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// Prometheus name
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name string
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// Simple prometheus description
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description string
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// Prometheus type
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valueType prometheus.ValueType
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// Sysctl name
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mib string
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// Sysctl data-type
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dataType bsdSysctlType
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// Post-retrieval conversion hooks
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conversion func(float64) float64
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}
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func (b bsdSysctl) Value() (float64, error) {
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var tmp32 uint32
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var tmp64 uint64
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var tmpf64 float64
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var err error
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switch b.dataType {
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case bsdSysctlTypeUint32:
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tmp32, err = unix.SysctlUint32(b.mib)
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tmpf64 = float64(tmp32)
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case bsdSysctlTypeUint64:
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tmp64, err = unix.SysctlUint64(b.mib)
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tmpf64 = float64(tmp64)
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case bsdSysctlTypeStructTimeval:
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tmpf64, err = b.getStructTimeval()
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case bsdSysctlTypeCLong:
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tmpf64, err = b.getCLong()
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}
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if err != nil {
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return 0, err
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}
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if b.conversion != nil {
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return b.conversion(tmpf64), nil
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}
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return tmpf64, nil
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}
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func (b bsdSysctl) getStructTimeval() (float64, error) {
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raw, err := unix.SysctlRaw(b.mib)
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if err != nil {
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return 0, err
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}
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if len(raw) != int(unsafe.Sizeof(syscall.Timeval{})) {
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// Shouldn't get here.
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return 0, fmt.Errorf(
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"length of bytes received from sysctl (%d) does not match expected bytes (%d)",
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len(raw),
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unsafe.Sizeof(syscall.Timeval{}),
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)
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}
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tv := *(*syscall.Timeval)(unsafe.Pointer(&raw[0]))
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// This conversion maintains the usec precision. Using the time
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// package did not.
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return (float64(tv.Sec) + (float64(tv.Usec) / float64(1000*1000))), nil
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}
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func (b bsdSysctl) getCLong() (float64, error) {
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raw, err := unix.SysctlRaw(b.mib)
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if err != nil {
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return 0, err
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}
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if len(raw) == C.sizeof_long {
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return float64(*(*C.long)(unsafe.Pointer(&raw[0]))), nil
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}
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if len(raw) == C.sizeof_int {
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// This is valid for at least vfs.bufspace, and the default
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// long handler - which can clamp longs to 32-bits:
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// https://github.com/freebsd/freebsd/blob/releng/10.3/sys/kern/vfs_bio.c#L338
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// https://github.com/freebsd/freebsd/blob/releng/10.3/sys/kern/kern_sysctl.c#L1062
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return float64(*(*C.int)(unsafe.Pointer(&raw[0]))), nil
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}
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return 0, fmt.Errorf(
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"length of bytes received from sysctl (%d) does not match expected bytes (long: %d), (int: %d)",
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len(raw),
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C.sizeof_long,
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C.sizeof_int,
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)
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}
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