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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/*
+ * Copyright (C) 2008 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 ANDROID_IBINDER_H
+#define ANDROID_IBINDER_H
+
+#include <utils/Errors.h>
+#include <utils/RefBase.h>
+#include <utils/String16.h>
+#include <utils/Vector.h>
+
+
+#define B_PACK_CHARS(c1, c2, c3, c4) \
+ ((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))
+
+// ---------------------------------------------------------------------------
+namespace android {
+
+class BBinder;
+class BpBinder;
+class IInterface;
+class Parcel;
+
+/**
+ * Base class and low-level protocol for a remotable object.
+ * You can derive from this class to create an object for which other
+ * processes can hold references to it. Communication between processes
+ * (method calls, property get and set) is down through a low-level
+ * protocol implemented on top of the transact() API.
+ */
+class IBinder : public virtual RefBase
+{
+public:
+ enum {
+ FIRST_CALL_TRANSACTION = 0x00000001,
+ LAST_CALL_TRANSACTION = 0x00ffffff,
+
+ PING_TRANSACTION = B_PACK_CHARS('_','P','N','G'),
+ DUMP_TRANSACTION = B_PACK_CHARS('_','D','M','P'),
+ INTERFACE_TRANSACTION = B_PACK_CHARS('_', 'N', 'T', 'F'),
+
+ // Corresponds to TF_ONE_WAY -- an asynchronous call.
+ FLAG_ONEWAY = 0x00000001
+ };
+
+ IBinder();
+
+ /**
+ * Check if this IBinder implements the interface named by
+ * @a descriptor. If it does, the base pointer to it is returned,
+ * which you can safely static_cast<> to the concrete C++ interface.
+ */
+ virtual sp<IInterface> queryLocalInterface(const String16& descriptor);
+
+ /**
+ * Return the canonical name of the interface provided by this IBinder
+ * object.
+ */
+ virtual const String16& getInterfaceDescriptor() const = 0;
+
+ virtual bool isBinderAlive() const = 0;
+ virtual status_t pingBinder() = 0;
+ virtual status_t dump(int fd, const Vector<String16>& args) = 0;
+
+ virtual status_t transact( uint32_t code,
+ const Parcel& data,
+ Parcel* reply,
+ uint32_t flags = 0) = 0;
+
+ /**
+ * This method allows you to add data that is transported through
+ * IPC along with your IBinder pointer. When implementing a Binder
+ * object, override it to write your desired data in to @a outData.
+ * You can then call getConstantData() on your IBinder to retrieve
+ * that data, from any process. You MUST return the number of bytes
+ * written in to the parcel (including padding).
+ */
+ class DeathRecipient : public virtual RefBase
+ {
+ public:
+ virtual void binderDied(const wp<IBinder>& who) = 0;
+ };
+
+ /**
+ * Register the @a recipient for a notification if this binder
+ * goes away. If this binder object unexpectedly goes away
+ * (typically because its hosting process has been killed),
+ * then DeathRecipient::binderDied() will be called with a reference
+ * to this.
+ *
+ * The @a cookie is optional -- if non-NULL, it should be a
+ * memory address that you own (that is, you know it is unique).
+ *
+ * @note You will only receive death notifications for remote binders,
+ * as local binders by definition can't die without you dying as well.
+ * Trying to use this function on a local binder will result in an
+ * INVALID_OPERATION code being returned and nothing happening.
+ *
+ * @note This link always holds a weak reference to its recipient.
+ *
+ * @note You will only receive a weak reference to the dead
+ * binder. You should not try to promote this to a strong reference.
+ * (Nor should you need to, as there is nothing useful you can
+ * directly do with it now that it has passed on.)
+ */
+ virtual status_t linkToDeath(const sp<DeathRecipient>& recipient,
+ void* cookie = NULL,
+ uint32_t flags = 0) = 0;
+
+ /**
+ * Remove a previously registered death notification.
+ * The @a recipient will no longer be called if this object
+ * dies. The @a cookie is optional. If non-NULL, you can
+ * supply a NULL @a recipient, and the recipient previously
+ * added with that cookie will be unlinked.
+ */
+ virtual status_t unlinkToDeath( const wp<DeathRecipient>& recipient,
+ void* cookie = NULL,
+ uint32_t flags = 0,
+ wp<DeathRecipient>* outRecipient = NULL) = 0;
+
+ virtual bool checkSubclass(const void* subclassID) const;
+
+ typedef void (*object_cleanup_func)(const void* id, void* obj, void* cleanupCookie);
+
+ virtual void attachObject( const void* objectID,
+ void* object,
+ void* cleanupCookie,
+ object_cleanup_func func) = 0;
+ virtual void* findObject(const void* objectID) const = 0;
+ virtual void detachObject(const void* objectID) = 0;
+
+ virtual BBinder* localBinder();
+ virtual BpBinder* remoteBinder();
+
+protected:
+ virtual ~IBinder();
+
+private:
+};
+
+}; // namespace android
+
+// ---------------------------------------------------------------------------
+
+#endif // ANDROID_IBINDER_H