/
util.go
executable file
·113 lines (94 loc) · 2.38 KB
/
util.go
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// Copyright 2019 Chaos Mesh 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package chaosdaemon
import (
"fmt"
"io/ioutil"
"os"
"strconv"
"sync"
"github.com/chaos-mesh/chaos-mesh/pkg/bpm"
)
// ReadCommName returns the command name of process
func ReadCommName(pid int) (string, error) {
f, err := os.Open(fmt.Sprintf("%s/%d/comm", bpm.DefaultProcPrefix, pid))
if err != nil {
return "", err
}
defer f.Close()
b, err := ioutil.ReadAll(f)
if err != nil {
return "", err
}
return string(b), nil
}
// GetChildProcesses will return all child processes's pid. Include all generations.
// only return error when /proc/pid/tasks cannot be read
func GetChildProcesses(ppid uint32) ([]uint32, error) {
procs, err := ioutil.ReadDir(bpm.DefaultProcPrefix)
if err != nil {
return nil, err
}
type processPair struct {
Pid uint32
Ppid uint32
}
pairs := make(chan processPair)
done := make(chan bool)
go func() {
var wg sync.WaitGroup
for _, proc := range procs {
_, err := strconv.ParseUint(proc.Name(), 10, 32)
if err != nil {
continue
}
statusPath := bpm.DefaultProcPrefix + "/" + proc.Name() + "/stat"
wg.Add(1)
go func() {
defer wg.Done()
reader, err := os.Open(statusPath)
if err != nil {
log.Error(err, "read status file error", "path", statusPath)
return
}
defer reader.Close()
var (
pid uint32
comm string
state string
parent uint32
)
// according to procfs's man page
fmt.Fscanf(reader, "%d %s %s %d", &pid, &comm, &state, &parent)
pairs <- processPair{
Pid: pid,
Ppid: parent,
}
}()
}
wg.Wait()
done <- true
}()
processGraph := NewGraph()
for {
select {
case pair := <-pairs:
processGraph.Insert(pair.Ppid, pair.Pid)
case <-done:
return processGraph.Flatten(ppid), nil
}
}
}
func encodeOutputToError(output []byte, err error) error {
return fmt.Errorf("error code: %v, msg: %s", err, string(output))
}