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