return Itimerval{}, err
	}

	return prev, nil
}

//sysnb	rtSigprocmask(how int, set *Sigset_t, oldset *Sigset_t, sigsetsize uintptr) (err error) = SYS_RT_SIGPROCMASK

func PthreadSigmask(how int, set, oldset *Sigset_t) error {
	if oldset != nil {
		// Explicitly clear in case Sigset_t is larger than _C__NSIG.
		*oldset = Sigset_t{}
	}
	return rtSigprocmask(how, set, oldset, _C__NSIG/8)
}