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 #include "PipeRelay.h" 18 19 #include <sys/socket.h> 20 #include <utils/Thread.h> 21 22 namespace android { 23 namespace lshal { 24 25 struct PipeRelay::RelayThread : public Thread { 26 explicit RelayThread(int fd, std::ostream &os); 27 28 bool threadLoop() override; 29 30 private: 31 int mFd; 32 std::ostream &mOutStream; 33 34 DISALLOW_COPY_AND_ASSIGN(RelayThread); 35 }; 36 37 //////////////////////////////////////////////////////////////////////////////// 38 RelayThread(int fd,std::ostream & os)39 PipeRelay::RelayThread::RelayThread(int fd, std::ostream &os) 40 : mFd(fd), 41 mOutStream(os) { 42 } 43 threadLoop()44 bool PipeRelay::RelayThread::threadLoop() { 45 char buffer[1024]; 46 ssize_t n = read(mFd, buffer, sizeof(buffer)); 47 48 if (n <= 0) { 49 return false; 50 } 51 52 mOutStream.write(buffer, n); 53 54 return true; 55 } 56 57 //////////////////////////////////////////////////////////////////////////////// 58 PipeRelay(std::ostream & os)59 PipeRelay::PipeRelay(std::ostream &os) 60 : mOutStream(os), 61 mInitCheck(NO_INIT) { 62 int res = socketpair(AF_UNIX, SOCK_STREAM, 0 /* protocol */, mFds); 63 64 if (res < 0) { 65 mInitCheck = -errno; 66 return; 67 } 68 69 mThread = new RelayThread(mFds[0], os); 70 mInitCheck = mThread->run("RelayThread"); 71 } 72 CloseFd(int * fd)73 void PipeRelay::CloseFd(int *fd) { 74 if (*fd >= 0) { 75 close(*fd); 76 *fd = -1; 77 } 78 } 79 ~PipeRelay()80 PipeRelay::~PipeRelay() { 81 if (mFds[1] >= 0) { 82 shutdown(mFds[1], SHUT_WR); 83 } 84 85 if (mFds[0] >= 0) { 86 shutdown(mFds[0], SHUT_RD); 87 } 88 89 if (mThread != NULL) { 90 mThread->join(); 91 mThread.clear(); 92 } 93 94 CloseFd(&mFds[1]); 95 CloseFd(&mFds[0]); 96 } 97 initCheck() const98 status_t PipeRelay::initCheck() const { 99 return mInitCheck; 100 } 101 fd() const102 int PipeRelay::fd() const { 103 return mFds[1]; 104 } 105 106 } // namespace lshal 107 } // namespace android 108