133 lines
3.4 KiB
Go
133 lines
3.4 KiB
Go
// Copyright 2019 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"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"regexp"
|
|
"strings"
|
|
)
|
|
|
|
// Regexp variables
|
|
var (
|
|
rPos = regexp.MustCompile(`^pos:\s+(\d+)$`)
|
|
rFlags = regexp.MustCompile(`^flags:\s+(\d+)$`)
|
|
rMntID = regexp.MustCompile(`^mnt_id:\s+(\d+)$`)
|
|
rInotify = regexp.MustCompile(`^inotify`)
|
|
)
|
|
|
|
// ProcFDInfo contains represents file descriptor information.
|
|
type ProcFDInfo struct {
|
|
// File descriptor
|
|
FD string
|
|
// File offset
|
|
Pos string
|
|
// File access mode and status flags
|
|
Flags string
|
|
// Mount point ID
|
|
MntID string
|
|
// List of inotify lines (structed) in the fdinfo file (kernel 3.8+ only)
|
|
InotifyInfos []InotifyInfo
|
|
}
|
|
|
|
// FDInfo constructor. On kernels older than 3.8, InotifyInfos will always be empty.
|
|
func (p Proc) FDInfo(fd string) (*ProcFDInfo, error) {
|
|
f, err := os.Open(p.path("fdinfo", fd))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
fdinfo, err := ioutil.ReadAll(f)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("could not read %s: %s", f.Name(), err)
|
|
}
|
|
|
|
var text, pos, flags, mntid string
|
|
var inotify []InotifyInfo
|
|
|
|
scanner := bufio.NewScanner(strings.NewReader(string(fdinfo)))
|
|
for scanner.Scan() {
|
|
text = scanner.Text()
|
|
if rPos.MatchString(text) {
|
|
pos = rPos.FindStringSubmatch(text)[1]
|
|
} else if rFlags.MatchString(text) {
|
|
flags = rFlags.FindStringSubmatch(text)[1]
|
|
} else if rMntID.MatchString(text) {
|
|
mntid = rMntID.FindStringSubmatch(text)[1]
|
|
} else if rInotify.MatchString(text) {
|
|
newInotify, err := parseInotifyInfo(text)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
inotify = append(inotify, *newInotify)
|
|
}
|
|
}
|
|
|
|
i := &ProcFDInfo{
|
|
FD: fd,
|
|
Pos: pos,
|
|
Flags: flags,
|
|
MntID: mntid,
|
|
InotifyInfos: inotify,
|
|
}
|
|
|
|
return i, nil
|
|
}
|
|
|
|
// InotifyInfo represents a single inotify line in the fdinfo file.
|
|
type InotifyInfo struct {
|
|
// Watch descriptor number
|
|
WD string
|
|
// Inode number
|
|
Ino string
|
|
// Device ID
|
|
Sdev string
|
|
// Mask of events being monitored
|
|
Mask string
|
|
}
|
|
|
|
// InotifyInfo constructor. Only available on kernel 3.8+.
|
|
func parseInotifyInfo(line string) (*InotifyInfo, error) {
|
|
r := regexp.MustCompile(`^inotify\s+wd:([0-9a-f]+)\s+ino:([0-9a-f]+)\s+sdev:([0-9a-f]+)\s+mask:([0-9a-f]+)`)
|
|
m := r.FindStringSubmatch(line)
|
|
i := &InotifyInfo{
|
|
WD: m[1],
|
|
Ino: m[2],
|
|
Sdev: m[3],
|
|
Mask: m[4],
|
|
}
|
|
return i, nil
|
|
}
|
|
|
|
// ProcFDInfos represents a list of ProcFDInfo structs.
|
|
type ProcFDInfos []ProcFDInfo
|
|
|
|
func (p ProcFDInfos) Len() int { return len(p) }
|
|
func (p ProcFDInfos) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
|
|
func (p ProcFDInfos) Less(i, j int) bool { return p[i].FD < p[j].FD }
|
|
|
|
// InotifyWatchLen returns the total number of inotify watches
|
|
func (p ProcFDInfos) InotifyWatchLen() (int, error) {
|
|
length := 0
|
|
for _, f := range p {
|
|
length += len(f.InotifyInfos)
|
|
}
|
|
|
|
return length, nil
|
|
}
|