1 /*
2 * Copyright (C) 2020 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 <log/log.h>
18 #include <sys/epoll.h>
19 #include "multihal_sensors.h"
20
21 namespace goldfish {
22
23 namespace {
epollCtlAdd(int epollFd,int fd)24 int epollCtlAdd(int epollFd, int fd) {
25 struct epoll_event ev;
26 ev.events = EPOLLIN;
27 ev.data.fd = fd;
28 return TEMP_FAILURE_RETRY(epoll_ctl(epollFd, EPOLL_CTL_ADD, fd, &ev));
29 }
30
qemuSensortThreadRcvCommand(const int fd)31 int qemuSensortThreadRcvCommand(const int fd) {
32 char buf;
33 if (TEMP_FAILURE_RETRY(read(fd, &buf, 1)) == 1) {
34 return buf;
35 } else {
36 return -1;
37 }
38 }
39 } // namespace
40
qemuSensorListenerThreadStart(MultihalSensors * that)41 void MultihalSensors::qemuSensorListenerThreadStart(MultihalSensors* that) {
42 that->qemuSensorListenerThread();
43 }
44
qemuSensorListenerThread()45 void MultihalSensors::qemuSensorListenerThread() {
46 const unique_fd epollFd(epoll_create1(0));
47 if (!epollFd.ok()) {
48 ALOGE("%s:%d: epoll_create1 failed", __func__, __LINE__);
49 ::abort();
50 }
51
52 epollCtlAdd(epollFd.get(), m_qemuSensorsFd.get());
53 epollCtlAdd(epollFd.get(), m_sensorThreadFd.get());
54
55 QemuSensorsProtocolState protocolState;
56
57 while (true) {
58 struct epoll_event events[2];
59 const int kTimeoutMs = 60000;
60 const int n = TEMP_FAILURE_RETRY(epoll_wait(epollFd.get(),
61 events, 2,
62 kTimeoutMs));
63 if (n < 0) {
64 ALOGE("%s:%d: epoll_wait failed with '%s'",
65 __func__, __LINE__, strerror(errno));
66 continue;
67 }
68
69 for (int i = 0; i < n; ++i) {
70 const struct epoll_event* ev = &events[i];
71 const int fd = ev->data.fd;
72 const int ev_events = ev->events;
73
74 if (fd == m_qemuSensorsFd.get()) {
75 if (ev_events & (EPOLLERR | EPOLLHUP)) {
76 ALOGE("%s:%d: epoll_wait: devFd has an error, ev_events=%x",
77 __func__, __LINE__, ev_events);
78 ::abort();
79 } else if (ev_events & EPOLLIN) {
80 parseQemuSensorEvent(m_qemuSensorsFd.get(), &protocolState);
81 }
82 } else if (fd == m_sensorThreadFd.get()) {
83 if (ev_events & (EPOLLERR | EPOLLHUP)) {
84 ALOGE("%s:%d: epoll_wait: threadsFd has an error, ev_events=%x",
85 __func__, __LINE__, ev_events);
86 ::abort();
87 } else if (ev_events & EPOLLIN) {
88 const int cmd = qemuSensortThreadRcvCommand(fd);
89 if (cmd == kCMD_QUIT) {
90 return;
91 } else {
92 ALOGE("%s:%d: qemuSensortThreadRcvCommand returned unexpected command, cmd=%d",
93 __func__, __LINE__, cmd);
94 ::abort();
95 }
96 }
97 } else {
98 ALOGE("%s:%d: epoll_wait() returned unexpected fd",
99 __func__, __LINE__);
100 }
101 }
102 }
103 }
104
105 } // namespace goldfish
106