BpHwBinder.cpp - platform/system/libhwbinder - Git at Google

 /*
  * Copyright (C) 2005 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.
  */

 #define LOG_TAG "hw-BpHwBinder"
 //#define LOG_NDEBUG 0

 #include <hwbinder/BpHwBinder.h>

 #include <hwbinder/IPCThreadState.h>
 #include <utils/Log.h>

 #include <stdio.h>

 //#undef ALOGV
 //#define ALOGV(...) fprintf(stderr, __VA_ARGS__)

 namespace android {
 namespace hardware {

 // ---------------------------------------------------------------------------

 BpHwBinder::ObjectManager::ObjectManager()
 {
 }

 BpHwBinder::ObjectManager::~ObjectManager()
 {
     kill();
 }

 void BpHwBinder::ObjectManager::attach(
     const void* objectID, void* object, void* cleanupCookie,
     IBinder::object_cleanup_func func)
 {
     entry_t e;
     e.object = object;
     e.cleanupCookie = cleanupCookie;
     e.func = func;

     if (mObjects.indexOfKey(objectID) >= 0) {
         ALOGE("Trying to attach object ID %p to binder ObjectManager %p with object %p, but object ID already in use",
                 objectID, this,  object);
         return;
     }

     mObjects.add(objectID, e);
 }

 void* BpHwBinder::ObjectManager::find(const void* objectID) const
 {
     const ssize_t i = mObjects.indexOfKey(objectID);
     if (i < 0) return nullptr;
     return mObjects.valueAt(i).object;
 }

 void BpHwBinder::ObjectManager::detach(const void* objectID)
 {
     mObjects.removeItem(objectID);
 }

 void BpHwBinder::ObjectManager::kill()
 {
     const size_t N = mObjects.size();
     ALOGV("Killing %zu objects in manager %p", N, this);
     for (size_t i=0; i<N; i++) {
         const entry_t& e = mObjects.valueAt(i);
         if (e.func != nullptr) {
             e.func(mObjects.keyAt(i), e.object, e.cleanupCookie);
         }
     }

     mObjects.clear();
 }

 // ---------------------------------------------------------------------------

 BpHwBinder::BpHwBinder(int32_t handle)
     : mHandle(handle)
     , mAlive(1)
     , mObitsSent(0)
     , mObituaries(nullptr)
 {
     ALOGV("Creating BpHwBinder %p handle %d\n", this, mHandle);

     extendObjectLifetime(OBJECT_LIFETIME_WEAK);
     IPCThreadState::self()->incWeakHandle(handle, this);
 }

 status_t BpHwBinder::transact(
     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags, TransactCallback callback)
 {
     // Once a binder has died, it will never come back to life.
     if (mAlive) {
         status_t status = IPCThreadState::self()->transact(
             mHandle, code, data, reply, flags);

         if (status == ::android::OK && callback != nullptr) {
             callback(*reply);
         }

         if (status == DEAD_OBJECT) mAlive = 0;
         return status;
     }

     return DEAD_OBJECT;
 }

 status_t BpHwBinder::linkToDeath(
     const sp<DeathRecipient>& recipient, void* cookie, uint32_t flags)
 {
     Obituary ob;
     ob.recipient = recipient;
     ob.cookie = cookie;
     ob.flags = flags;

     LOG_ALWAYS_FATAL_IF(recipient == nullptr,
                         "linkToDeath(): recipient must be non-NULL");

     {
         AutoMutex _l(mLock);

         if (!mObitsSent) {
             if (!mObituaries) {
                 mObituaries = new Vector<Obituary>;
                 if (!mObituaries) {
                     return NO_MEMORY;
                 }
                 ALOGV("Requesting death notification: %p handle %d\n", this, mHandle);
                 getWeakRefs()->incWeak(this);
                 IPCThreadState* self = IPCThreadState::self();
                 self->requestDeathNotification(mHandle, this);
                 self->flushCommands();
             }
             ssize_t res = mObituaries->add(ob);
             return res >= (ssize_t)NO_ERROR ? (status_t)NO_ERROR : res;
         }
     }

     return DEAD_OBJECT;
 }

 status_t BpHwBinder::unlinkToDeath(
     const wp<DeathRecipient>& recipient, void* cookie, uint32_t flags,
     wp<DeathRecipient>* outRecipient)
 {
     AutoMutex _l(mLock);

     if (mObitsSent) {
         return DEAD_OBJECT;
     }

     const size_t N = mObituaries ? mObituaries->size() : 0;
     for (size_t i=0; i<N; i++) {
         const Obituary& obit = mObituaries->itemAt(i);
         if ((obit.recipient == recipient
                     || (recipient == nullptr && obit.cookie == cookie))
                 && obit.flags == flags) {
             if (outRecipient != nullptr) {
                 *outRecipient = mObituaries->itemAt(i).recipient;
             }
             mObituaries->removeAt(i);
             if (mObituaries->size() == 0) {
                 ALOGV("Clearing death notification: %p handle %d\n", this, mHandle);
                 IPCThreadState* self = IPCThreadState::self();
                 self->clearDeathNotification(mHandle, this);
                 self->flushCommands();
                 delete mObituaries;
                 mObituaries = nullptr;
             }
             return NO_ERROR;
         }
     }

     return NAME_NOT_FOUND;
 }

 void BpHwBinder::sendObituary()
 {
     ALOGV("Sending obituary for proxy %p handle %d, mObitsSent=%s\n",
         this, mHandle, mObitsSent ? "true" : "false");

     mAlive = 0;
     if (mObitsSent) return;

     mLock.lock();
     Vector<Obituary>* obits = mObituaries;
     if(obits != nullptr) {
         ALOGV("Clearing sent death notification: %p handle %d\n", this, mHandle);
         IPCThreadState* self = IPCThreadState::self();
         self->clearDeathNotification(mHandle, this);
         self->flushCommands();
         mObituaries = nullptr;
     }
     mObitsSent = 1;
     mLock.unlock();

     ALOGV("Reporting death of proxy %p for %zu recipients\n",
         this, obits ? obits->size() : 0U);

     if (obits != nullptr) {
         const size_t N = obits->size();
         for (size_t i=0; i<N; i++) {
             reportOneDeath(obits->itemAt(i));
         }

         delete obits;
     }
 }

 // Returns the strong refcount on the object this proxy points to, or
 // -1 in case of failure.
 ssize_t BpHwBinder::getNodeStrongRefCount()
 {
     return ProcessState::self()->getStrongRefCountForNodeByHandle(mHandle);
 }

 void BpHwBinder::reportOneDeath(const Obituary& obit)
 {
     sp<DeathRecipient> recipient = obit.recipient.promote();
     ALOGV("Reporting death to recipient: %p\n", recipient.get());
     if (recipient == nullptr) return;

     recipient->binderDied(this);
 }


 void BpHwBinder::attachObject(
     const void* objectID, void* object, void* cleanupCookie,
     object_cleanup_func func)
 {
     AutoMutex _l(mLock);
     ALOGV("Attaching object %p to binder %p (manager=%p)", object, this, &mObjects);
     mObjects.attach(objectID, object, cleanupCookie, func);
 }

 void* BpHwBinder::findObject(const void* objectID) const
 {
     AutoMutex _l(mLock);
     return mObjects.find(objectID);
 }

 void BpHwBinder::detachObject(const void* objectID)
 {
     AutoMutex _l(mLock);
     mObjects.detach(objectID);
 }

 BpHwBinder* BpHwBinder::remoteBinder()
 {
     return this;
 }

 BpHwBinder::~BpHwBinder()
 {
     ALOGV("Destroying BpHwBinder %p handle %d\n", this, mHandle);

     IPCThreadState* ipc = IPCThreadState::self();

     if (ipc) {
         ipc->expungeHandle(mHandle, this);
         ipc->decWeakHandle(mHandle);
     }
 }

 void BpHwBinder::onFirstRef()
 {
     ALOGV("onFirstRef BpHwBinder %p handle %d\n", this, mHandle);
     IPCThreadState* ipc = IPCThreadState::self();
     if (ipc) ipc->incStrongHandle(mHandle, this);
 }

 void BpHwBinder::onLastStrongRef(const void* /*id*/)
 {
     ALOGV("onLastStrongRef BpHwBinder %p handle %d\n", this, mHandle);
     IF_ALOGV() {
         printRefs();
     }
     IPCThreadState* ipc = IPCThreadState::self();
     if (ipc) {
         ipc->decStrongHandle(mHandle);
         ipc->flushCommands();
     }

     mLock.lock();
     Vector<Obituary>* obits = mObituaries;
     if(obits != nullptr) {
         if (!obits->isEmpty()) {
             ALOGI("onLastStrongRef automatically unlinking death recipients");
         }

         if (ipc) ipc->clearDeathNotification(mHandle, this);
         mObituaries = nullptr;
     }
     mLock.unlock();

     if (obits != nullptr) {
         // XXX Should we tell any remaining DeathRecipient
         // objects that the last strong ref has gone away, so they
         // are no longer linked?
         delete obits;
         obits = nullptr;
     }
 }

 bool BpHwBinder::onIncStrongAttempted(uint32_t /*flags*/, const void* /*id*/)
 {
     ALOGV("onIncStrongAttempted BpHwBinder %p handle %d\n", this, mHandle);
     IPCThreadState* ipc = IPCThreadState::self();
     return ipc ? ipc->attemptIncStrongHandle(mHandle) == NO_ERROR : false;
 }

 // ---------------------------------------------------------------------------

 } // namespace hardware
 } // namespace android
	/*
	* Copyright (C) 2005 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.
	*/

	#define LOG_TAG "hw-BpHwBinder"
	//#define LOG_NDEBUG 0

	#include <hwbinder/BpHwBinder.h>

	#include <hwbinder/IPCThreadState.h>
	#include <utils/Log.h>

	#include <stdio.h>

	//#undef ALOGV
	//#define ALOGV(...) fprintf(stderr, __VA_ARGS__)

	namespace android {
	namespace hardware {

	// ---------------------------------------------------------------------------

	BpHwBinder::ObjectManager::ObjectManager()
	{
	}

	BpHwBinder::ObjectManager::~ObjectManager()
	{
	kill();
	}

	void BpHwBinder::ObjectManager::attach(
	const void* objectID, void* object, void* cleanupCookie,
	IBinder::object_cleanup_func func)
	{
	entry_t e;
	e.object = object;
	e.cleanupCookie = cleanupCookie;
	e.func = func;

	if (mObjects.indexOfKey(objectID) >= 0) {
	ALOGE("Trying to attach object ID %p to binder ObjectManager %p with object %p, but object ID already in use",
	objectID, this, object);
	return;
	}

	mObjects.add(objectID, e);
	}

	void* BpHwBinder::ObjectManager::find(const void* objectID) const
	{
	const ssize_t i = mObjects.indexOfKey(objectID);
	if (i < 0) return nullptr;
	return mObjects.valueAt(i).object;
	}

	void BpHwBinder::ObjectManager::detach(const void* objectID)
	{
	mObjects.removeItem(objectID);
	}

	void BpHwBinder::ObjectManager::kill()
	{
	const size_t N = mObjects.size();
	ALOGV("Killing %zu objects in manager %p", N, this);
	for (size_t i=0; i<N; i++) {
	const entry_t& e = mObjects.valueAt(i);
	if (e.func != nullptr) {
	e.func(mObjects.keyAt(i), e.object, e.cleanupCookie);
	}
	}

	mObjects.clear();
	}

	// ---------------------------------------------------------------------------

	BpHwBinder::BpHwBinder(int32_t handle)
	: mHandle(handle)
	, mAlive(1)
	, mObitsSent(0)
	, mObituaries(nullptr)
	{
	ALOGV("Creating BpHwBinder %p handle %d\n", this, mHandle);

	extendObjectLifetime(OBJECT_LIFETIME_WEAK);
	IPCThreadState::self()->incWeakHandle(handle, this);
	}

	status_t BpHwBinder::transact(
	uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags, TransactCallback callback)
	{
	// Once a binder has died, it will never come back to life.
	if (mAlive) {
	status_t status = IPCThreadState::self()->transact(
	mHandle, code, data, reply, flags);

	if (status == ::android::OK && callback != nullptr) {
	callback(*reply);
	}

	if (status == DEAD_OBJECT) mAlive = 0;
	return status;
	}

	return DEAD_OBJECT;
	}

	status_t BpHwBinder::linkToDeath(
	const sp<DeathRecipient>& recipient, void* cookie, uint32_t flags)
	{
	Obituary ob;
	ob.recipient = recipient;
	ob.cookie = cookie;
	ob.flags = flags;

	LOG_ALWAYS_FATAL_IF(recipient == nullptr,
	"linkToDeath(): recipient must be non-NULL");

	{
	AutoMutex _l(mLock);

	if (!mObitsSent) {
	if (!mObituaries) {
	mObituaries = new Vector<Obituary>;
	if (!mObituaries) {
	return NO_MEMORY;
	}
	ALOGV("Requesting death notification: %p handle %d\n", this, mHandle);
	getWeakRefs()->incWeak(this);
	IPCThreadState* self = IPCThreadState::self();
	self->requestDeathNotification(mHandle, this);
	self->flushCommands();
	}
	ssize_t res = mObituaries->add(ob);
	return res >= (ssize_t)NO_ERROR ? (status_t)NO_ERROR : res;
	}
	}

	return DEAD_OBJECT;
	}

	status_t BpHwBinder::unlinkToDeath(
	const wp<DeathRecipient>& recipient, void* cookie, uint32_t flags,
	wp<DeathRecipient>* outRecipient)
	{
	AutoMutex _l(mLock);

	if (mObitsSent) {
	return DEAD_OBJECT;
	}

	const size_t N = mObituaries ? mObituaries->size() : 0;
	for (size_t i=0; i<N; i++) {
	const Obituary& obit = mObituaries->itemAt(i);
	if ((obit.recipient == recipient
	\|\| (recipient == nullptr && obit.cookie == cookie))
	&& obit.flags == flags) {
	if (outRecipient != nullptr) {
	*outRecipient = mObituaries->itemAt(i).recipient;
	}
	mObituaries->removeAt(i);
	if (mObituaries->size() == 0) {
	ALOGV("Clearing death notification: %p handle %d\n", this, mHandle);
	IPCThreadState* self = IPCThreadState::self();
	self->clearDeathNotification(mHandle, this);
	self->flushCommands();
	delete mObituaries;
	mObituaries = nullptr;
	}
	return NO_ERROR;
	}
	}

	return NAME_NOT_FOUND;
	}

	void BpHwBinder::sendObituary()
	{
	ALOGV("Sending obituary for proxy %p handle %d, mObitsSent=%s\n",
	this, mHandle, mObitsSent ? "true" : "false");

	mAlive = 0;
	if (mObitsSent) return;

	mLock.lock();
	Vector<Obituary>* obits = mObituaries;
	if(obits != nullptr) {
	ALOGV("Clearing sent death notification: %p handle %d\n", this, mHandle);
	IPCThreadState* self = IPCThreadState::self();
	self->clearDeathNotification(mHandle, this);
	self->flushCommands();
	mObituaries = nullptr;
	}
	mObitsSent = 1;
	mLock.unlock();

	ALOGV("Reporting death of proxy %p for %zu recipients\n",
	this, obits ? obits->size() : 0U);

	if (obits != nullptr) {
	const size_t N = obits->size();
	for (size_t i=0; i<N; i++) {
	reportOneDeath(obits->itemAt(i));
	}

	delete obits;
	}
	}

	// Returns the strong refcount on the object this proxy points to, or
	// -1 in case of failure.
	ssize_t BpHwBinder::getNodeStrongRefCount()
	{
	return ProcessState::self()->getStrongRefCountForNodeByHandle(mHandle);
	}

	void BpHwBinder::reportOneDeath(const Obituary& obit)
	{
	sp<DeathRecipient> recipient = obit.recipient.promote();
	ALOGV("Reporting death to recipient: %p\n", recipient.get());
	if (recipient == nullptr) return;

	recipient->binderDied(this);
	}


	void BpHwBinder::attachObject(
	const void* objectID, void* object, void* cleanupCookie,
	object_cleanup_func func)
	{
	AutoMutex _l(mLock);
	ALOGV("Attaching object %p to binder %p (manager=%p)", object, this, &mObjects);
	mObjects.attach(objectID, object, cleanupCookie, func);
	}

	void* BpHwBinder::findObject(const void* objectID) const
	{
	AutoMutex _l(mLock);
	return mObjects.find(objectID);
	}

	void BpHwBinder::detachObject(const void* objectID)
	{
	AutoMutex _l(mLock);
	mObjects.detach(objectID);
	}

	BpHwBinder* BpHwBinder::remoteBinder()
	{
	return this;
	}

	BpHwBinder::~BpHwBinder()
	{
	ALOGV("Destroying BpHwBinder %p handle %d\n", this, mHandle);

	IPCThreadState* ipc = IPCThreadState::self();

	if (ipc) {
	ipc->expungeHandle(mHandle, this);
	ipc->decWeakHandle(mHandle);
	}
	}

	void BpHwBinder::onFirstRef()
	{
	ALOGV("onFirstRef BpHwBinder %p handle %d\n", this, mHandle);
	IPCThreadState* ipc = IPCThreadState::self();
	if (ipc) ipc->incStrongHandle(mHandle, this);
	}

	void BpHwBinder::onLastStrongRef(const void* /id/)
	{
	ALOGV("onLastStrongRef BpHwBinder %p handle %d\n", this, mHandle);
	IF_ALOGV() {
	printRefs();
	}
	IPCThreadState* ipc = IPCThreadState::self();
	if (ipc) {
	ipc->decStrongHandle(mHandle);
	ipc->flushCommands();
	}

	mLock.lock();
	Vector<Obituary>* obits = mObituaries;
	if(obits != nullptr) {
	if (!obits->isEmpty()) {
	ALOGI("onLastStrongRef automatically unlinking death recipients");
	}

	if (ipc) ipc->clearDeathNotification(mHandle, this);
	mObituaries = nullptr;
	}
	mLock.unlock();

	if (obits != nullptr) {
	// XXX Should we tell any remaining DeathRecipient
	// objects that the last strong ref has gone away, so they
	// are no longer linked?
	delete obits;
	obits = nullptr;
	}
	}

	bool BpHwBinder::onIncStrongAttempted(uint32_t /flags/, const void* /id/)
	{
	ALOGV("onIncStrongAttempted BpHwBinder %p handle %d\n", this, mHandle);
	IPCThreadState* ipc = IPCThreadState::self();
	return ipc ? ipc->attemptIncStrongHandle(mHandle) == NO_ERROR : false;
	}

	// ---------------------------------------------------------------------------

	} // namespace hardware
	} // namespace android