mirror of
https://github.com/containers/podman.git
synced 2025-11-16 11:07:44 +08:00
60a74088fa
When running podman top, the processes collected can exit befor psgo gets information on the processes. This can cause some weird errors and creates some CI flakes. psgo now properly ignores this situation rather then returning errors Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
94 lines
2.1 KiB
Go
94 lines
2.1 KiB
Go
// Copyright 2018 psgo authors
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//
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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 proc
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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// GetPIDs extracts and returns all PIDs from /proc.
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func GetPIDs() ([]string, error) {
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procDir, err := os.Open("/proc/")
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if err != nil {
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return nil, err
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}
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defer procDir.Close()
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// extract string slice of all directories in procDir
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pidDirs, err := procDir.Readdirnames(0)
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if err != nil {
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return nil, err
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}
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pids := []string{}
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for _, pidDir := range pidDirs {
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_, err := strconv.Atoi(pidDir)
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if err != nil {
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// skip non-numerical entries (e.g., `/proc/softirqs`)
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continue
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}
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pids = append(pids, pidDir)
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}
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return pids, nil
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}
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// pidCgroupPath returns the path to the pid's pids cgroup.
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func pidCgroupPath(pid string) (string, error) {
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f, err := os.Open(fmt.Sprintf("/proc/%s/cgroup", pid))
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if err != nil {
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return "", err
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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fields := strings.Split(scanner.Text(), ":")
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if len(fields) != 3 {
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continue
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}
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if fields[1] == "pids" {
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return fmt.Sprintf("/sys/fs/cgroup/pids/%s/cgroup.procs", fields[2]), nil
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}
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}
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return "", fmt.Errorf("couldn't find pids group for PID %s", pid)
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}
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// GetPIDsFromCgroup returns a strings slice of all pids listesd in pid's pids
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// cgroup.
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func GetPIDsFromCgroup(pid string) ([]string, error) {
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cgroupPath, err := pidCgroupPath(pid)
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if err != nil {
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return nil, err
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}
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f, err := os.Open(cgroupPath)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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pids := []string{}
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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pids = append(pids, scanner.Text())
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}
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return pids, nil
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}
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