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#define LOG_TAG "PipeComm" 18 19#include <android/hardware/automotive/vehicle/2.0/IVehicle.h> 20#include <log/log.h> 21#include <qemu_pipe.h> 22 23#include "PipeComm.h" 24 25#define CAR_SERVICE_NAME "pipe:qemud:car" 26 27 28namespace android { 29namespace hardware { 30namespace automotive { 31namespace vehicle { 32namespace V2_0 { 33 34namespace impl { 35 36PipeComm::PipeComm() { 37 // Initialize member vars 38 mPipeFd = -1; 39} 40 41 42int PipeComm::open() { 43 int fd = qemu_pipe_open(CAR_SERVICE_NAME); 44 45 if (fd < 0) { 46 ALOGE("%s: Could not open connection to service: %s %d", __FUNCTION__, strerror(errno), fd); 47 return -errno; 48 } 49 50 ALOGI("%s: OPENED PIPE, fd=%d", __FUNCTION__, fd); 51 mPipeFd = fd; 52 return 0; 53} 54 55std::vector<uint8_t> PipeComm::read() { 56 static constexpr int MAX_RX_MSG_SZ = 2048; 57 std::vector<uint8_t> msg = std::vector<uint8_t>(MAX_RX_MSG_SZ); 58 int numBytes; 59 60 numBytes = qemu_pipe_frame_recv(mPipeFd, msg.data(), msg.size()); 61 62 if (numBytes == MAX_RX_MSG_SZ) { 63 ALOGE("%s: Received max size = %d", __FUNCTION__, MAX_RX_MSG_SZ); 64 } else if (numBytes > 0) { 65 msg.resize(numBytes); 66 return msg; 67 } else { 68 ALOGD("%s: Connection terminated on pipe %d, numBytes=%d", __FUNCTION__, mPipeFd, numBytes); 69 { 70 std::lock_guard<std::mutex> lock(mMutex); 71 mPipeFd = -1; 72 } 73 } 74 75 return std::vector<uint8_t>(); 76} 77 78int PipeComm::write(const std::vector<uint8_t>& data) { 79 int retVal = 0; 80 81 { 82 std::lock_guard<std::mutex> lock(mMutex); 83 if (mPipeFd != -1) { 84 retVal = qemu_pipe_frame_send(mPipeFd, data.data(), data.size()); 85 } 86 } 87 88 if (retVal < 0) { 89 retVal = -errno; 90 ALOGE("%s: send_cmd: (fd=%d): ERROR: %s", __FUNCTION__, mPipeFd, strerror(errno)); 91 } 92 93 return retVal; 94} 95 96 97} // impl 98 99} // namespace V2_0 100} // namespace vehicle 101} // namespace automotive 102} // namespace hardware 103} // namespace android 104 105 106 107