APM_ENT_SIG
entry->ent.ent_sig = APM_ENT_SIG;
table->self.ent_sig = APM_ENT_SIG;
if (table->self.ent_sig != APM_ENT_SIG)
be16enc(buf, APM_ENT_SIG);
be16enc(ptr, APM_ENT_SIG);
be16enc(&ent->ent_sig, APM_ENT_SIG);
be16enc(&ent->ent_sig, APM_ENT_SIG);