code: func (m *podContainerManagerImpl) killOnePid(pid int) error {
  	// os.FindProcess never returns an error on POSIX
  	// https://go-review.googlesource.com/c/go/+/19093
  	p, _ := os.FindProcess(pid)
  	if err := p.Kill(); err != nil {
  		// If the process already exited, that's fine.
  		if strings.Contains(err.Error(), "process already finished") {
  			// Hate parsing strings, but
  			// vendor/github.com/opencontainers/runc/libcontainer/
  			// also does this.
  			klog.V(3).Infof("process with pid %v no longer exists", pid)
  			return nil
  		}
  		return err
  	}
  	return nil
  }
docs: // Kill one process ID