ktr_psig
struct ktr_psig kp;
kte->kte_kth.ktr_len = sizeof(struct ktr_psig);
__strong_alias(ktr_psig,nullop);
void ktr_psig(int, sig_t, const sigset_t *, const ksiginfo_t *);
ktr_psig(a, b, c, d);
struct ktr_psig ps;
case sizeof(struct ktr_psig):
struct ktr_psig *psig = (struct ktr_psig *)(kth + 1);