sigclear
sigclear(&l->l_sigpend, NULL, &kq);
sigclear(&p->p_sigpend, &stopsigmask, &kq);
sigclear(&p->p_sigpend, &contsigmask, &kq);
sigclear(&p->p_sigpend, mask, kq);
sigclear(&l->l_sigpend, mask, kq);
sigclear(&p->p_sigpend, mask, kq);
void sigclear(sigpend_t *, const sigset_t *, ksiginfoq_t *);