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/*
* Copyright (C) 2019 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 <android-base/logging.h>
#include <android-base/unique_fd.h>
#include <binder/BinderService.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/ProcessState.h>
#include <binder/Status.h>
#include <cutils/native_handle.h>
#include <hidl/HidlTransportSupport.h>
#include <hidl/Status.h>
#include <utils/String16.h>
#include <android/ashmemd/BnAshmemDeviceService.h>
#include <android/system/ashmem/1.0/IAshmem.h>
using android::sp;
using android::String16;
using android::base::unique_fd;
using android::hardware::configureRpcThreadpool;
using android::hardware::joinRpcThreadpool;
using android::hardware::Return;
using android::hardware::Void;
using android::system::ashmem::V1_0::IAshmem;
namespace android {
namespace ashmemd {
inline unique_fd openDevAshmem() {
int fd = TEMP_FAILURE_RETRY(::open("/dev/ashmem", O_RDWR | O_CLOEXEC));
return unique_fd(fd);
}
class AshmemAidlService : public BnAshmemDeviceService {
public:
binder::Status open(os::ParcelFileDescriptor *ashmemFd) override {
ashmemFd->reset(openDevAshmem());
return binder::Status::ok();
}
};
class AshmemHidlService : public IAshmem {
public:
Return<void> open(open_cb _hidl_cb) override {
unique_fd fd = openDevAshmem();
if (fd == -1) {
_hidl_cb(nullptr);
} else {
native_handle_t *native_handle =
native_handle_create(1 /* num_fds */, 0 /* num_ints */);
native_handle->data[0] = fd.get();
_hidl_cb(native_handle);
// unique_fd, fd, will close when it falls out of scope, no need to
// call native_handle_close.
native_handle_delete(native_handle);
}
return Void();
}
};
} // namespace ashmemd
} // namespace android
using android::ashmemd::AshmemAidlService;
using android::ashmemd::AshmemHidlService;
int main() {
configureRpcThreadpool(1, true /* callerWillJoin */);
sp<AshmemAidlService> ashmemAidlService = new AshmemAidlService();
android::defaultServiceManager()->addService(
String16("ashmem_device_service"), ashmemAidlService,
true /* allowIsolated */);
sp<AshmemHidlService> ashmemHidlService = new AshmemHidlService();
auto status = ashmemHidlService->registerAsService();
if (status != android::OK) {
LOG(FATAL) << "Unable to register ashmem hidl service: " << status;
}
// Create non-HW binder threadpool for Aidl Service
sp<android::ProcessState> ps{android::ProcessState::self()};
ps->startThreadPool();
joinRpcThreadpool();
std::abort(); // unreachable
}
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