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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 "real_binder_wrapper.h"
#include <base/logging.h>
#include <binder/Binder.h>
#include <binder/IBinder.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
namespace android {
// Class that handles binder death notifications. libbinder wants the recipient
// to be wrapped in sp<>, so registering RealBinderWrapper as a recipient would
// be awkward.
class RealBinderWrapper::DeathRecipient : public IBinder::DeathRecipient {
public:
explicit DeathRecipient(const base::Closure& callback)
: callback_(callback) {}
~DeathRecipient() = default;
// IBinder::DeathRecipient:
void binderDied(const wp<IBinder>& who) override {
callback_.Run();
}
private:
// Callback to run in response to binder death.
base::Closure callback_;
DISALLOW_COPY_AND_ASSIGN(DeathRecipient);
};
RealBinderWrapper::RealBinderWrapper() = default;
RealBinderWrapper::~RealBinderWrapper() = default;
sp<IBinder> RealBinderWrapper::GetService(const std::string& service_name) {
sp<IServiceManager> service_manager = defaultServiceManager();
if (!service_manager.get()) {
LOG(ERROR) << "Unable to get service manager";
return sp<IBinder>();
}
sp<IBinder> binder =
service_manager->checkService(String16(service_name.c_str()));
if (!binder.get())
LOG(ERROR) << "Unable to get \"" << service_name << "\" service";
return binder;
}
bool RealBinderWrapper::RegisterService(const std::string& service_name,
const sp<IBinder>& binder) {
sp<IServiceManager> service_manager = defaultServiceManager();
if (!service_manager.get()) {
LOG(ERROR) << "Unable to get service manager";
return false;
}
status_t status = defaultServiceManager()->addService(
String16(service_name.c_str()), binder);
if (status != OK) {
LOG(ERROR) << "Failed to register \"" << service_name << "\" with service "
<< "manager";
return false;
}
return true;
}
sp<BBinder> RealBinderWrapper::CreateLocalBinder() {
return sp<BBinder>(new BBinder());
}
bool RealBinderWrapper::RegisterForDeathNotifications(
const sp<IBinder>& binder,
const base::Closure& callback) {
sp<DeathRecipient> recipient(new DeathRecipient(callback));
if (binder->linkToDeath(recipient) != OK) {
LOG(ERROR) << "Failed to register for death notifications on "
<< binder.get();
return false;
}
death_recipients_[binder] = recipient;
return true;
}
bool RealBinderWrapper::UnregisterForDeathNotifications(
const sp<IBinder>& binder) {
auto it = death_recipients_.find(binder);
if (it == death_recipients_.end()) {
LOG(ERROR) << "Not registered for death notifications on " << binder.get();
return false;
}
if (binder->unlinkToDeath(it->second) != OK) {
LOG(ERROR) << "Failed to unregister for death notifications on "
<< binder.get();
return false;
}
death_recipients_.erase(it);
return true;
}
uid_t RealBinderWrapper::GetCallingUid() {
return IPCThreadState::self()->getCallingUid();
}
pid_t RealBinderWrapper::GetCallingPid() {
return IPCThreadState::self()->getCallingPid();
}
} // namespace android