| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| /* |
| * Implementation of the user-space ashmem API for devices, which have our |
| * ashmem-enabled kernel. See ashmem-sim.c for the "fake" tmp-based version, |
| * used by the simulator. |
| */ |
| |
| #include "IPCSender.h" |
| #include "Buffering/IPCBuffer.h" |
| #include "IPCArguments.h" |
| #include "IPCByteArray.h" |
| #include "IPCCheck.h" |
| #include "IPCCommunicator.h" |
| #include "IPCException.h" |
| #include "IPCHandler.h" |
| #include "IPCResult.h" |
| #include "IPCString.h" |
| #include "Serializing/IPCSerializer.h" |
| #include <errno.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <vector> |
| |
| namespace { |
| class IPCSenderImpl : public IPCCommunicator, public IPCSender { |
| public: |
| IPCSenderImpl(IPCFutexPageQueue*, IPCHandler* handler); |
| ~IPCSenderImpl(); |
| std::unique_ptr<IPCResult> send(IPCBuffer*) override; |
| |
| private: |
| bool checkBufferAsync(IPCBuffer* buffer); |
| IPCHandler* m_handler; |
| }; |
| |
| IPCSenderImpl::IPCSenderImpl(IPCFutexPageQueue* futexPageQueue, IPCHandler* handler) |
| : IPCCommunicator(futexPageQueue) |
| , m_handler(handler) |
| { |
| } |
| |
| IPCSenderImpl::~IPCSenderImpl() |
| { |
| } |
| |
| std::unique_ptr<IPCResult> IPCSenderImpl::send(IPCBuffer* buffer) |
| { |
| doSendBufferOnly(buffer); |
| if (checkBufferAsync(buffer)) |
| return createVoidResult(); |
| while (true) { |
| uint32_t msg = doReadPackage(); |
| bool isAsync = !!(msg & MSG_FLAG_ASYNC); |
| msg &= MSG_MASK; |
| if (msg == MSG_END) { |
| std::unique_ptr<IPCResult> result = assembleResult(); |
| releaseBlob(); |
| return result; |
| } else if (msg == MSG_TERMINATE) { |
| releaseBlob(); |
| throw IPCException("peer terminates"); |
| } |
| std::unique_ptr<IPCArguments> arguments = assembleArguments(); |
| releaseBlob(); |
| std::unique_ptr<IPCResult> sendBack = m_handler->handle(msg, arguments.get()); |
| if (!isAsync) { |
| std::unique_ptr<IPCBuffer> resultBuffer = generateResultBuffer(sendBack.get()); |
| doSendBufferOnly(resultBuffer.get()); |
| } |
| } |
| } |
| |
| bool IPCSenderImpl::checkBufferAsync(IPCBuffer* buffer) |
| { |
| uint32_t msg = *static_cast<const uint32_t*>(buffer->get()); |
| return !!(msg & MSG_FLAG_ASYNC); |
| } |
| } |
| |
| std::unique_ptr<IPCSender> createIPCSender(IPCFutexPageQueue* futexPageQueue, IPCHandler* handler) |
| { |
| return std::unique_ptr<IPCSender>(new IPCSenderImpl(futexPageQueue, handler)); |
| } |