| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed 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. |
| */ |
| |
| #include <log/log.h> |
| #include <sys/epoll.h> |
| #include "multihal_sensors.h" |
| |
| namespace goldfish { |
| |
| namespace { |
| int epollCtlAdd(int epollFd, int fd) { |
| struct epoll_event ev; |
| ev.events = EPOLLIN; |
| ev.data.fd = fd; |
| return TEMP_FAILURE_RETRY(epoll_ctl(epollFd, EPOLL_CTL_ADD, fd, &ev)); |
| } |
| |
| int qemuSensortThreadRcvCommand(const int fd) { |
| char buf; |
| if (TEMP_FAILURE_RETRY(read(fd, &buf, 1)) == 1) { |
| return buf; |
| } else { |
| return -1; |
| } |
| } |
| } // namespace |
| |
| void MultihalSensors::qemuSensorListenerThread() { |
| const unique_fd epollFd(epoll_create1(0)); |
| if (!epollFd.ok()) { |
| ALOGE("%s:%d: epoll_create1 failed", __func__, __LINE__); |
| ::abort(); |
| } |
| |
| epollCtlAdd(epollFd.get(), m_qemuSensorsFd.get()); |
| epollCtlAdd(epollFd.get(), m_sensorThreadFd.get()); |
| |
| QemuSensorsProtocolState protocolState; |
| |
| while (true) { |
| struct epoll_event events[2]; |
| const int kTimeoutMs = 60000; |
| const int n = TEMP_FAILURE_RETRY(epoll_wait(epollFd.get(), |
| events, 2, |
| kTimeoutMs)); |
| if (n < 0) { |
| ALOGE("%s:%d: epoll_wait failed with '%s'", |
| __func__, __LINE__, strerror(errno)); |
| continue; |
| } |
| |
| for (int i = 0; i < n; ++i) { |
| const struct epoll_event* ev = &events[i]; |
| const int fd = ev->data.fd; |
| const int ev_events = ev->events; |
| |
| if (fd == m_qemuSensorsFd.get()) { |
| if (ev_events & (EPOLLERR | EPOLLHUP)) { |
| ALOGE("%s:%d: epoll_wait: devFd has an error, ev_events=%x", |
| __func__, __LINE__, ev_events); |
| ::abort(); |
| } else if (ev_events & EPOLLIN) { |
| parseQemuSensorEvent(m_qemuSensorsFd.get(), &protocolState); |
| } |
| } else if (fd == m_sensorThreadFd.get()) { |
| if (ev_events & (EPOLLERR | EPOLLHUP)) { |
| ALOGE("%s:%d: epoll_wait: threadsFd has an error, ev_events=%x", |
| __func__, __LINE__, ev_events); |
| ::abort(); |
| } else if (ev_events & EPOLLIN) { |
| const int cmd = qemuSensortThreadRcvCommand(fd); |
| if (cmd == kCMD_QUIT) { |
| return; |
| } else { |
| ALOGE("%s:%d: qemuSensortThreadRcvCommand returned unexpected command, cmd=%d", |
| __func__, __LINE__, cmd); |
| ::abort(); |
| } |
| } |
| } else { |
| ALOGE("%s:%d: epoll_wait() returned unexpected fd", |
| __func__, __LINE__); |
| } |
| } |
| } |
| } |
| |
| } // namespace goldfish |