mirror of https://github.com/docker/cli.git
134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
// Copyright 2019 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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"regexp"
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"github.com/prometheus/procfs/internal/util"
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)
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// Regexp variables
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var (
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rPos = regexp.MustCompile(`^pos:\s+(\d+)$`)
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rFlags = regexp.MustCompile(`^flags:\s+(\d+)$`)
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rMntID = regexp.MustCompile(`^mnt_id:\s+(\d+)$`)
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rInotify = regexp.MustCompile(`^inotify`)
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rInotifyParts = regexp.MustCompile(`^inotify\s+wd:([0-9a-f]+)\s+ino:([0-9a-f]+)\s+sdev:([0-9a-f]+)(?:\s+mask:([0-9a-f]+))?`)
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)
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// ProcFDInfo contains represents file descriptor information.
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type ProcFDInfo struct {
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// File descriptor
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FD string
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// File offset
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Pos string
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// File access mode and status flags
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Flags string
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// Mount point ID
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MntID string
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// List of inotify lines (structed) in the fdinfo file (kernel 3.8+ only)
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InotifyInfos []InotifyInfo
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}
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// FDInfo constructor. On kernels older than 3.8, InotifyInfos will always be empty.
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func (p Proc) FDInfo(fd string) (*ProcFDInfo, error) {
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data, err := util.ReadFileNoStat(p.path("fdinfo", fd))
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if err != nil {
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return nil, err
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}
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var text, pos, flags, mntid string
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var inotify []InotifyInfo
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scanner := bufio.NewScanner(bytes.NewReader(data))
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for scanner.Scan() {
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text = scanner.Text()
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if rPos.MatchString(text) {
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pos = rPos.FindStringSubmatch(text)[1]
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} else if rFlags.MatchString(text) {
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flags = rFlags.FindStringSubmatch(text)[1]
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} else if rMntID.MatchString(text) {
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mntid = rMntID.FindStringSubmatch(text)[1]
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} else if rInotify.MatchString(text) {
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newInotify, err := parseInotifyInfo(text)
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if err != nil {
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return nil, err
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}
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inotify = append(inotify, *newInotify)
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}
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}
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i := &ProcFDInfo{
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FD: fd,
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Pos: pos,
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Flags: flags,
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MntID: mntid,
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InotifyInfos: inotify,
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}
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return i, nil
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}
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// InotifyInfo represents a single inotify line in the fdinfo file.
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type InotifyInfo struct {
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// Watch descriptor number
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WD string
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// Inode number
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Ino string
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// Device ID
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Sdev string
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// Mask of events being monitored
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Mask string
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}
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// InotifyInfo constructor. Only available on kernel 3.8+.
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func parseInotifyInfo(line string) (*InotifyInfo, error) {
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m := rInotifyParts.FindStringSubmatch(line)
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if len(m) >= 4 {
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var mask string
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if len(m) == 5 {
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mask = m[4]
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}
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i := &InotifyInfo{
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WD: m[1],
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Ino: m[2],
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Sdev: m[3],
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Mask: mask,
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}
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return i, nil
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}
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return nil, errors.New("invalid inode entry: " + line)
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}
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// ProcFDInfos represents a list of ProcFDInfo structs.
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type ProcFDInfos []ProcFDInfo
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func (p ProcFDInfos) Len() int { return len(p) }
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func (p ProcFDInfos) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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func (p ProcFDInfos) Less(i, j int) bool { return p[i].FD < p[j].FD }
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// InotifyWatchLen returns the total number of inotify watches
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func (p ProcFDInfos) InotifyWatchLen() (int, error) {
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length := 0
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for _, f := range p {
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length += len(f.InotifyInfos)
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}
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return length, nil
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}
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