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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef android_hardware_automotive_vehicle_V2_0_impl_PipeComm_H_
     18 #define android_hardware_automotive_vehicle_V2_0_impl_PipeComm_H_
     19 
     20 #include <mutex>
     21 #include <vector>
     22 #include "CommBase.h"
     23 
     24 namespace android {
     25 namespace hardware {
     26 namespace automotive {
     27 namespace vehicle {
     28 namespace V2_0 {
     29 
     30 namespace impl {
     31 
     32 /**
     33  * PipeComm uses a qemu pipe interface to connect to the Goldfish Emulator.
     34  */
     35 class PipeComm : public CommBase {
     36 public:
     37     PipeComm();
     38 
     39     /**
     40      * Opens a pipe and begins listening.
     41      *
     42      * @return int Returns 0 on success.
     43      */
     44     int open() override;
     45 
     46     /**
     47      * Blocking call to read data from the connection.
     48      *
     49      * @return std::vector<uint8_t> Serialized protobuf data received from emulator.  This will be
     50      *              an empty vector if the connection was closed or some other error occurred.
     51      */
     52     std::vector<uint8_t> read() override;
     53 
     54     /**
     55      * Transmits a string of data to the emulator.
     56      *
     57      * @param data Serialized protobuf data to transmit.
     58      *
     59      * @return int Number of bytes transmitted, or -1 if failed.
     60      */
     61     int write(const std::vector<uint8_t>& data) override;
     62 
     63 private:
     64     std::mutex mMutex;
     65     int mPipeFd;
     66 };
     67 
     68 }  // impl
     69 
     70 }  // namespace V2_0
     71 }  // namespace vehicle
     72 }  // namespace automotive
     73 }  // namespace hardware
     74 }  // namespace android
     75 
     76 
     77 #endif  // android_hardware_automotive_vehicle_V2_0_impl_PipeComm_H_
     78