1 /* 2 * Copyright (C) 2010 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 <stdint.h> 18 #include <sys/types.h> 19 20 #include <unistd.h> 21 #include <fcntl.h> 22 23 #include <utils/Errors.h> 24 25 #include <binder/Parcel.h> 26 27 #include <gui/SensorChannel.h> 28 29 namespace android { 30 // ---------------------------------------------------------------------------- 31 32 SensorChannel::SensorChannel() 33 : mSendFd(-1), mReceiveFd(-1) 34 { 35 int fds[2]; 36 if (pipe(fds) == 0) { 37 mReceiveFd = fds[0]; 38 mSendFd = fds[1]; 39 fcntl(mReceiveFd, F_SETFL, O_NONBLOCK); 40 fcntl(mSendFd, F_SETFL, O_NONBLOCK); 41 } 42 } 43 44 SensorChannel::SensorChannel(const Parcel& data) 45 : mSendFd(-1), mReceiveFd(-1) 46 { 47 mReceiveFd = dup(data.readFileDescriptor()); 48 fcntl(mReceiveFd, F_SETFL, O_NONBLOCK); 49 } 50 51 SensorChannel::~SensorChannel() 52 { 53 if (mSendFd >= 0) 54 close(mSendFd); 55 56 if (mReceiveFd >= 0) 57 close(mReceiveFd); 58 } 59 60 int SensorChannel::getFd() const 61 { 62 return mReceiveFd; 63 } 64 65 ssize_t SensorChannel::write(void const* vaddr, size_t size) 66 { 67 ssize_t len = ::write(mSendFd, vaddr, size); 68 if (len < 0) 69 return -errno; 70 return len; 71 } 72 73 ssize_t SensorChannel::read(void* vaddr, size_t size) 74 { 75 ssize_t len = ::read(mReceiveFd, vaddr, size); 76 if (len < 0) 77 return -errno; 78 return len; 79 } 80 81 status_t SensorChannel::writeToParcel(Parcel* reply) const 82 { 83 if (mReceiveFd < 0) 84 return -EINVAL; 85 86 status_t result = reply->writeDupFileDescriptor(mReceiveFd); 87 close(mReceiveFd); 88 mReceiveFd = -1; 89 return result; 90 } 91 92 // ---------------------------------------------------------------------------- 93 }; // namespace android 94
