99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
// Copyright 2022 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 procfs
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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// Interrupt represents a single interrupt line.
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type Interrupt struct {
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// Info is the type of interrupt.
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Info string
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// Devices is the name of the device that is located at that IRQ
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Devices string
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// Values is the number of interrupts per CPU.
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Values []string
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}
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// Interrupts models the content of /proc/interrupts. Key is the IRQ number.
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// - https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/s2-proc-interrupts
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// - https://raspberrypi.stackexchange.com/questions/105802/explanation-of-proc-interrupts-output
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type Interrupts map[string]Interrupt
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// Interrupts creates a new instance from a given Proc instance.
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func (p Proc) Interrupts() (Interrupts, error) {
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data, err := util.ReadFileNoStat(p.path("interrupts"))
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if err != nil {
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return nil, err
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}
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return parseInterrupts(bytes.NewReader(data))
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}
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func parseInterrupts(r io.Reader) (Interrupts, error) {
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var (
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interrupts = Interrupts{}
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scanner = bufio.NewScanner(r)
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)
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if !scanner.Scan() {
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return nil, errors.New("interrupts empty")
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}
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cpuNum := len(strings.Fields(scanner.Text())) // one header per cpu
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for scanner.Scan() {
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parts := strings.Fields(scanner.Text())
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if len(parts) == 0 { // skip empty lines
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continue
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}
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if len(parts) < 2 {
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return nil, fmt.Errorf("%w: Not enough fields in interrupts (expected 2+ fields but got %d): %s", ErrFileParse, len(parts), parts)
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}
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intName := parts[0][:len(parts[0])-1] // remove trailing :
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if len(parts) == 2 {
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interrupts[intName] = Interrupt{
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Info: "",
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Devices: "",
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Values: []string{
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parts[1],
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},
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}
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continue
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}
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intr := Interrupt{
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Values: parts[1 : cpuNum+1],
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}
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if _, err := strconv.Atoi(intName); err == nil { // numeral interrupt
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intr.Info = parts[cpuNum+1]
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intr.Devices = strings.Join(parts[cpuNum+2:], " ")
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} else {
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intr.Info = strings.Join(parts[cpuNum+1:], " ")
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}
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interrupts[intName] = intr
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}
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return interrupts, scanner.Err()
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}
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