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diff --git a/otautil/ThermalUtil.h b/otautil/ThermalUtil.h
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+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef OTAUTIL_THERMALUTIL_H
+#define OTAUTIL_THERMALUTIL_H
+
+// We can find the temperature reported by all sensors in /sys/class/thermal/thermal_zone*/temp.
+// Their values are in millidegree Celsius; and we will log the maximum one.
+int GetMaxValueFromThermalZone();
+
+#endif  // OTAUTIL_THERMALUTIL_H