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105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
package procfs
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/*
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Copyright 2015 The Kubernetes 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"unicode"
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"github.com/sirupsen/logrus"
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)
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// PidOf finds process(es) with a specified name (regexp match)
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// and return their pid(s)
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func PidOf(name string) ([]int, error) {
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if len(name) == 0 {
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return []int{}, fmt.Errorf("name should not be empty")
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}
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re, err := regexp.Compile("(^|/)" + name + "$")
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if err != nil {
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return []int{}, err
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}
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return getPids(re), nil
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}
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func getPids(re *regexp.Regexp) []int {
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pids := []int{}
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dirFD, err := os.Open("/proc")
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if err != nil {
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return nil
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}
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defer dirFD.Close()
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for {
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// Read a small number at a time in case there are many entries, we don't want to
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// allocate a lot here.
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ls, err := dirFD.Readdir(10)
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if err == io.EOF {
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break
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}
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if err != nil {
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return nil
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}
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for _, entry := range ls {
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if !entry.IsDir() {
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continue
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}
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// If the directory is not a number (i.e. not a PID), skip it
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pid, err := strconv.Atoi(entry.Name())
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if err != nil {
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continue
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}
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cmdline, err := ioutil.ReadFile(filepath.Join("/proc", entry.Name(), "cmdline"))
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if err != nil {
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logrus.Infof("Error reading file %s: %+v", filepath.Join("/proc", entry.Name(), "cmdline"), err)
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continue
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}
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// The bytes we read have '\0' as a separator for the command line
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parts := bytes.SplitN(cmdline, []byte{0}, 2)
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if len(parts) == 0 {
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continue
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}
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// Split the command line itself we are interested in just the first part
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exe := strings.FieldsFunc(string(parts[0]), func(c rune) bool {
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return unicode.IsSpace(c) || c == ':'
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})
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if len(exe) == 0 {
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continue
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}
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// Check if the name of the executable is what we are looking for
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if re.MatchString(exe[0]) {
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// Grab the PID from the directory path
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pids = append(pids, pid)
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}
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}
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}
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return pids
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}
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