mirror of
https://github.com/prometheus/node_exporter.git
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db8ec9c6b4
Adds new sysctl type, bsdSysctlTypeStructTimeval to enable parsing of timevals from raw memory.
123 lines
2.9 KiB
Go
123 lines
2.9 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
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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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"github.com/prometheus/client_golang/prometheus"
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"golang.org/x/sys/unix"
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"unsafe"
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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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)
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// Contains all the info needed to map a single bsd-sysctl to a prometheus 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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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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/*
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* From 10.3-RELEASE sources:
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*
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* /usr/include/sys/_timeval.h:47
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* time_t tv_sec
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* suseconds_t tv_usec
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*
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* /usr/include/sys/_types.h:60
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* long __suseconds_t
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*
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* ... architecture dependent, via #ifdef:
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* typedef __int64_t __time_t;
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* typedef __int32_t __time_t;
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*/
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if len(raw) != (C.sizeof_time_t + C.sizeof_suseconds_t) {
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// Shouldn't get here, unless the ABI changes...
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return 0, fmt.Errorf(
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"Length of bytes recieved from sysctl (%d) does not match expected bytes (%d).",
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len(raw),
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C.sizeof_time_t+C.sizeof_suseconds_t,
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)
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}
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secondsUp := unsafe.Pointer(&raw[0])
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susecondsUp := uintptr(secondsUp) + C.sizeof_time_t
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unix := float64(*(*C.time_t)(secondsUp))
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usec := float64(*(*C.suseconds_t)(unsafe.Pointer(susecondsUp)))
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// This conversion maintains the usec precision. Using
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// the time package did not.
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tmpf64 = unix + (usec / float64(1000*1000))
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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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