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/*
* Copyright (C) 2016 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/BpBinder.h>
#include <binder/IPCThreadState.h>
#include <binder/Parcel.h>
namespace android {
BpBinder::BpBinder(int32_t handle)
: mObitsSent(0),
mObituaries(NULL),
mHandle(handle),
mAlive(1) {}
BpBinder::~BpBinder() {}
status_t BpBinder::transact(uint32_t code,
const Parcel& data,
Parcel* reply,
uint32_t flags) {
if (mAlive) {
status_t status = IPCThreadState::self()->transact(mHandle, code, data,
reply, flags);
if (status == DEAD_OBJECT) {
mAlive = 0;
}
return status;
}
return DEAD_OBJECT;
}
bool BpBinder::isBinderAlive() const {
return mAlive != 0;
}
BpBinder* BpBinder::remoteBinder() {
return this;
}
status_t BpBinder::pingBinder() {
Parcel send;
Parcel reply;
send.writeInt32(NO_ERROR);
status_t err = transact(PING_TRANSACTION, send, &reply);
if (err != NO_ERROR) return err;
if (reply.dataSize() < sizeof(status_t)) return NOT_ENOUGH_DATA;
return (status_t)reply.readInt32();
}
const String16& BpBinder::getInterfaceDescriptor() const {
if (isDescriptorCached() == false) {
Parcel send, reply;
// do the IPC without a lock held.
status_t err = const_cast<BpBinder*>(this)->transact(
INTERFACE_TRANSACTION, send, &reply);
if (err == NO_ERROR) {
String16 res(reply.readString16());
Mutex::Autolock _l(mLock);
// mDescriptorCache could have been assigned while the lock was
// released.
if (mDescriptorCache.size() == 0)
mDescriptorCache = res;
}
}
// we're returning a reference to a non-static object here. Usually this
// is not something smart to do, however, with binder objects it is
// (usually) safe because they are reference-counted.
return mDescriptorCache;
}
status_t BpBinder::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 == NULL,
"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);
}
ssize_t res = mObituaries->add(ob);
return res >= (ssize_t)NO_ERROR ? (status_t)NO_ERROR : res;
}
}
return DEAD_OBJECT;
}
status_t BpBinder::unlinkToDeath(const wp<DeathRecipient>& /*recipient*/,
void * /*cookie*/,
uint32_t /*flags*/,
wp<DeathRecipient> * /*outRecipient*/) {
// TODO: unimplemented.
return FAILED_TRANSACTION;
}
void BpBinder::sendObituary() {
mAlive = 0;
if (mObituaries != NULL) {
const size_t N = mObituaries->size();
for (size_t i = 0; i < N; i++) {
sp<DeathRecipient> recipient = mObituaries->itemAt(i).recipient.promote();
recipient->binderDied(this);
}
}
}
bool BpBinder::isDescriptorCached() const {
Mutex::Autolock _l(mLock);
return mDescriptorCache.size() ? true : false;
}
} // namespace android
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