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diff --git a/libs/binder/tests/IBinderRpcTest.aidl b/libs/binder/tests/IBinderRpcTest.aidl
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+++ b/libs/binder/tests/IBinderRpcTest.aidl
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+/*
+ * Copyright (C) 2020 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.
+ */
+
+interface IBinderRpcTest {
+    oneway void sendString(@utf8InCpp String str);
+    @utf8InCpp String doubleString(@utf8InCpp String str);
+
+    // number of known RPC binders to process, RpcState::countBinders by session
+    int[] countBinders();
+
+    // Caller sends server, callee pings caller's server and returns error code.
+    int pingMe(IBinder binder);
+    @nullable IBinder repeatBinder(@nullable IBinder binder);
+
+    void holdBinder(@nullable IBinder binder);
+    @nullable IBinder getHeldBinder();
+
+    // Idea is client creates its own instance of IBinderRpcTest and calls this,
+    // and the server calls 'binder' with (calls - 1) passing itself as 'binder',
+    // going back and forth until calls = 0
+    void nestMe(IBinderRpcTest binder, int calls);
+
+    // should always return the same binder
+    IBinder alwaysGiveMeTheSameBinder();
+
+    // Idea is that the server will not hold onto the session, the remote session
+    // object must. This is to test lifetimes of binder objects, and consequently, also
+    // identity (since by assigning sessions names, we can make sure a section always
+    // references the session it was originally opened with).
+    IBinderRpcSession openSession(@utf8InCpp String name);
+
+    // Decremented in ~IBinderRpcSession
+    int getNumOpenSessions();
+
+    // primitives to test threading behavior
+    void lock();
+    oneway void unlockInMsAsync(int ms);
+    void lockUnlock(); // locks and unlocks a mutex
+
+    // take up binder thread for some time
+    void sleepMs(int ms);
+    oneway void sleepMsAsync(int ms);
+
+    void die(boolean cleanup);
+}