func prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) {
	err = prlimit1(pid, resource, newlimit, old)
	if err == nil && newlimit != nil && resource == RLIMIT_NOFILE && (pid == 0 || pid == Getpid()) {
		origRlimitNofile.Store(nil)
	}
	return err