}
	defer forceCgoDNS()()
	order, _ := systemConf().hostLookupOrder(nil, "go.dev")
	if order != hostLookupCgo {
		t.Fatalf("hostLookupOrder returned: %v, want cgo", order)
	}
	order, _ = systemConf().addrLookupOrder(nil, "192.0.2.1")
	if order != hostLookupCgo {
		t.Fatalf("addrLookupOrder returned: %v, want cgo", order)
	}
	if systemConf().mustUseGoResolver(nil) {
		t.Fatal("mustUseGoResolver = true, want false")

	order, conf := systemConf().hostLookupOrder(r, host)
	if order == hostLookupCgo {
		return cgoLookupHost(ctx, host)
	}
	return r.goLookupHostOrder(ctx, host, order, conf)
}

func (r *Resolver) lookupIP(ctx context.Context, network, host string) (addrs []IPAddr, err error) {
	order, conf := systemConf().hostLookupOrder(r, host)
	if order == hostLookupCgo {

	for _, ip := range ips {
		addrs = append(addrs, ip.String())
	}
	return addrs, nil
}

func (r *Resolver) lookupIP(ctx context.Context, network, name string) ([]IPAddr, error) {
	if order, conf := systemConf().hostLookupOrder(r, name); order != hostLookupCgo {
		return r.goLookupIP(ctx, network, name, order, conf)
	}

	// TODO(bradfitz,brainman): use ctx more. See TODO below.

	var family int32 = syscall.AF_UNSPEC

				continue loop
			}
		}
		addrs = append(addrs, addr)
	}
	return
}

func (r *Resolver) lookupIP(ctx context.Context, network, host string) (addrs []IPAddr, err error) {
	if order, conf := systemConf().hostLookupOrder(r, host); order != hostLookupCgo {
		return r.goLookupIP(ctx, network, host, order, conf)
	}

	lits, err := r.lookupHost(ctx, host)
	if err != nil {
		return
	}

	mdnsAssumeExists
	mdnsAssumeDoesNotExist
)

var (
	confOnce sync.Once // guards init of confVal via initConfVal
	confVal  = &conf{goos: runtime.GOOS}
)

// systemConf returns the machine's network configuration.
func systemConf() *conf {
	confOnce.Do(initConfVal)
	return confVal
}

// initConfVal initializes confVal based on the environment
// that will not change during program execution.

	nssConfig.nssConf = nss
	nssConfig.mu.Unlock()
	nssConfig.acquireSema()
	nssConfig.lastChecked = time.Now().Add(addDur)
	nssConfig.releaseSema()
}

func TestSystemConf(t *testing.T) {
	systemConf()

	if err := os.WriteFile(tmpFile, []byte{}, 0660); err != nil {
		t.Fatal(err)
	}
	hostsFilePath = tmpFile

	const testName = "test.invalid"

	order, _ := systemConf().hostLookupOrder(DefaultResolver, testName)
	if order != hostLookupFiles {
		// skip test for systems which do not return hostLookupFiles
		t.Skipf("hostLookupOrder did not return hostLookupFiles")
	}