x86_set_ldt1
error = x86_set_ldt1(l, &ua, descv);
int x86_set_ldt1(struct lwp *, struct x86_set_ldt_args *, union descriptor *);
error = x86_set_ldt1(l, &ua, descv);
return x86_set_ldt1(l, &sl, &d);