ktrwrite2
ktrwrite2(p, &kth, &ktp, sizeof(ktp), retval, len);
error = ktrwrite2(p, &kth, &ktp, sizeof(ktp), cp, count);
ktrwrite2(p, &kth, name, strlen(name) + 1, data, datalen);
ktrwrite2(p, &kth, &ktp, sizeof(ktp), memp, len);
int ktrwrite2(struct proc *, struct ktr_header *, const void *, size_t,