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/*
* Copyright (C) 2015 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/IBinder.h>
#include <binder/Binder.h>
#include <binder/IInterface.h>
#include <binder/Parcel.h>
#include <log/log.h>
#include <utils/String16.h>
namespace android {
IBinder::IBinder() : RefBase() {}
IBinder::~IBinder() {}
sp<IInterface> IBinder::queryLocalInterface(const String16& /*descriptor*/) {
return NULL;
}
BBinder* IBinder::localBinder() {
return nullptr;
}
BpBinder* IBinder::remoteBinder() {
return nullptr;
}
BBinder::BBinder() {}
BBinder::~BBinder() {}
const String16& BBinder::getInterfaceDescriptor() const {
// This is a local static rather than a global static,
// to avoid static initializer ordering issues.
static String16 sEmptyDescriptor;
ALOGW("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;
}
BBinder* BBinder::localBinder() {
return this;
}
status_t BBinder::onTransact(uint32_t /*code*/,
const Parcel& /*data*/,
Parcel* /*reply*/,
uint32_t /*flags*/) {
return UNKNOWN_TRANSACTION;
}
status_t BBinder::pingBinder() {
return NO_ERROR;
}
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;
}
bool BBinder::isBinderAlive() const {
return true;
}
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
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