/* * 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. */ #include <binder/Binder.h> #include <utils/Atomic.h> #include <binder/BpBinder.h> #include <binder/IInterface.h> #include <binder/Parcel.h> #include <stdio.h> namespace android { // --------------------------------------------------------------------------- IBinder::IBinder() : RefBase() { } IBinder::~IBinder() { } // --------------------------------------------------------------------------- sp<IInterface> IBinder::queryLocalInterface(const String16& descriptor) { return NULL; } BBinder* IBinder::localBinder() { return NULL; } BpBinder* IBinder::remoteBinder() { return NULL; } bool IBinder::checkSubclass(const void* /*subclassID*/) const { return false; } // --------------------------------------------------------------------------- class BBinder::Extras { public: Mutex mLock; BpBinder::ObjectManager mObjects; }; // --------------------------------------------------------------------------- BBinder::BBinder() : mExtras(NULL) { } bool BBinder::isBinderAlive() const { return true; } status_t BBinder::pingBinder() { return NO_ERROR; } const String16& BBinder::getInterfaceDescriptor() const { // This is a local static rather than a global static, // to avoid static initializer ordering issues. static String16 sEmptyDescriptor; LOGW("reached BBinder::getInterfaceDescriptor (this=%p)", this); return sEmptyDescriptor; } status_t BBinder::transact( uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) { data.setDataPosition(0); status_t err = NO_ERROR; switch (code) { case PING_TRANSACTION: reply->writeInt32(pingBinder()); break; default: err = onTransact(code, data, reply, flags); break; } if (reply != NULL) { reply->setDataPosition(0); } return err; } status_t BBinder::linkToDeath( const sp<DeathRecipient>& recipient, void* cookie, uint32_t flags) { return INVALID_OPERATION; } status_t BBinder::unlinkToDeath( const wp<DeathRecipient>& recipient, void* cookie, uint32_t flags, wp<DeathRecipient>* outRecipient) { return INVALID_OPERATION; } status_t BBinder::dump(int fd, const Vector<String16>& args) { return NO_ERROR; } void BBinder::attachObject( const void* objectID, void* object, void* cleanupCookie, object_cleanup_func func) { Extras* e = mExtras; if (!e) { e = new Extras; if (android_atomic_cmpxchg(0, reinterpret_cast<int32_t>(e), reinterpret_cast<volatile int32_t*>(&mExtras)) != 0) { delete e; e = mExtras; } if (e == 0) return; // out of memory } AutoMutex _l(e->mLock); e->mObjects.attach(objectID, object, cleanupCookie, func); } void* BBinder::findObject(const void* objectID) const { Extras* e = mExtras; if (!e) return NULL; AutoMutex _l(e->mLock); return e->mObjects.find(objectID); } void BBinder::detachObject(const void* objectID) { Extras* e = mExtras; if (!e) return; AutoMutex _l(e->mLock); e->mObjects.detach(objectID); } BBinder* BBinder::localBinder() { return this; } BBinder::~BBinder() { if (mExtras) delete mExtras; } status_t BBinder::onTransact( uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags) { switch (code) { case INTERFACE_TRANSACTION: reply->writeString16(getInterfaceDescriptor()); return NO_ERROR; case DUMP_TRANSACTION: { int fd = data.readFileDescriptor(); int argc = data.readInt32(); Vector<String16> args; for (int i = 0; i < argc && data.dataAvail() > 0; i++) { args.add(data.readString16()); } return dump(fd, args); } default: return UNKNOWN_TRANSACTION; } } // --------------------------------------------------------------------------- enum { // This is used to transfer ownership of the remote binder from // the BpRefBase object holding it (when it is constructed), to the // owner of the BpRefBase object when it first acquires that BpRefBase. kRemoteAcquired = 0x00000001 }; BpRefBase::BpRefBase(const sp<IBinder>& o) : mRemote(o.get()), mRefs(NULL), mState(0) { extendObjectLifetime(OBJECT_LIFETIME_WEAK); if (mRemote) { mRemote->incStrong(this); // Removed on first IncStrong(). mRefs = mRemote->createWeak(this); // Held for our entire lifetime. } } BpRefBase::~BpRefBase() { if (mRemote) { if (!(mState&kRemoteAcquired)) { mRemote->decStrong(this); } mRefs->decWeak(this); } } void BpRefBase::onFirstRef() { android_atomic_or(kRemoteAcquired, &mState); } void BpRefBase::onLastStrongRef(const void* id) { if (mRemote) { mRemote->decStrong(this); } } bool BpRefBase::onIncStrongAttempted(uint32_t flags, const void* id) { return mRemote ? mRefs->attemptIncStrong(this) : false; } // --------------------------------------------------------------------------- }; // namespace android