sysctl_cvt_out
static int sysctl_cvt_out(struct lwp *, int, const struct sysctlnode *,
error = sysctl_cvt_out(l, v, node, oldp, *oldlenp, oldlenp);
error = sysctl_cvt_out(l, v, &onode, oldp, *oldlenp, oldlenp);
error = sysctl_cvt_out(l, v, onode, oldp, left, &t);
(void)sysctl_cvt_out(l, v, &node[ni], oldp,