AUX_null
for (auxstack = (AuxInfo *)stack; auxstack->au_id != AUX_null;
for (auxstack = (AuxInfo *)stack; auxstack->au_id != AUX_null;
for (auxstack = (AuxInfo *)stack; auxstack->au_id != AUX_null;
for (aux = (void *)envp; aux->au_id != AUX_null; aux++) {
for (auxstack = (AuxInfo *)stack; auxstack->au_id != AUX_null;
for (auxstack = (AuxInfo *)stack; auxstack->au_id != AUX_null;
for (auxstack = (AuxInfo *)stack; auxstack->au_id != AUX_null;
a->au_id = AUX_null;