_rtld_sysctl
i = _rtld_sysctl("machdep.pvr", &_rtld_ppc_pvr, &j);
i = _rtld_sysctl("hw.ncpu", &_rtld_ncpus, &j);
if ((i = _rtld_sysctl(x->ctlname, &val, &j)) == -1) {
int _rtld_sysctl(const char *, void *, size_t *);