Golang解决linux下 cmd.Start 执行shell指令僵尸进程无法回收的解决方案

Golang解决linux下 cmd.Start 执行shell指令僵尸进程无法回收的解决方案。

封装好的 linux下shell指令执行函数,  windows内powershell,cmd同理。

使用 

commandExample := `node ./val.js`
pid, out, err := CmdExec(commandExample)
// TODO use pid,out,err

func CmdExec(args ...string) (int, string, error) {
	ctx := context.Background()

	args = append([]string{"-c"}, args...)
	cmd := exec.CommandContext(ctx, os.Getenv("SHELL"), args...)

	cmd.SysProcAttr = &syscall.SysProcAttr{}

	outpip, err := cmd.StdoutPipe()
	defer outpip.Close()

	if err != nil {
		return 0, "", err
	}

	err = cmd.Start()
	if err != nil {
		return 0, "", err
	}

	out, err := ioutil.ReadAll(outpip)
	if err != nil {
		return 0, "", err
	}

	// 监听进程wait,回收子进程
	errCmdCh := make(chan error, 1)
	go func() {
		go func() {
			errCmdCh <- cmd.Wait()
		}()
		for {
			select {
			case <-ctx.Done():
				log.Println("ctx.done")
				pid := cmd.Process.Pid
				if err := syscall.Kill(-1*pid, syscall.SIGKILL); err != nil {
					return
				}
			case err := <-errCmdCh:
				log.Printf("errCmdCh error %+v \n", err)
				return
			default:
				log.Println(cmd.Process.Pid)
				time.Sleep(2 * time.Second)
			}
		}
	}()

	return cmd.Process.Pid, string(out), nil
}