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/*
* Copyright (C) 2018 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 <cutils/uevent.h>
#include <dirent.h>
#include <sys/inotify.h>
#include <sys/resource.h>
#include <sys/types.h>
#include <chrono>
#include <fstream>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include "thermal_watcher.h"
namespace android {
namespace hardware {
namespace thermal {
namespace V2_0 {
namespace implementation {
using std::chrono_literals::operator""ms;
void ThermalWatcher::registerFilesToWatch(const std::set<std::string> &sensors_to_watch,
bool uevent_monitor) {
monitored_sensors_.insert(sensors_to_watch.begin(), sensors_to_watch.end());
if (!uevent_monitor) {
is_polling_ = true;
return;
}
uevent_fd_.reset((TEMP_FAILURE_RETRY(uevent_open_socket(64 * 1024, true))));
if (uevent_fd_.get() < 0) {
LOG(ERROR) << "failed to open uevent socket";
is_polling_ = true;
return;
}
fcntl(uevent_fd_, F_SETFL, O_NONBLOCK);
looper_->addFd(uevent_fd_.get(), 0, Looper::EVENT_INPUT, nullptr, nullptr);
is_polling_ = false;
thermal_triggered_ = true;
last_update_time_ = boot_clock::now();
}
bool ThermalWatcher::startWatchingDeviceFiles() {
if (cb_) {
auto ret = this->run("FileWatcherThread", PRIORITY_HIGHEST);
if (ret != NO_ERROR) {
LOG(ERROR) << "ThermalWatcherThread start fail";
return false;
} else {
LOG(INFO) << "ThermalWatcherThread started";
return true;
}
}
return false;
}
void ThermalWatcher::parseUevent(std::set<std::string> *sensors_set) {
bool thermal_event = false;
constexpr int kUeventMsgLen = 2048;
char msg[kUeventMsgLen + 2];
char *cp;
while (true) {
int n = uevent_kernel_multicast_recv(uevent_fd_.get(), msg, kUeventMsgLen);
if (n <= 0) {
if (errno != EAGAIN && errno != EWOULDBLOCK) {
LOG(ERROR) << "Error reading from Uevent Fd";
}
break;
}
if (n >= kUeventMsgLen) {
LOG(ERROR) << "Uevent overflowed buffer, discarding";
continue;
}
msg[n] = '\0';
msg[n + 1] = '\0';
cp = msg;
while (*cp) {
std::string uevent = cp;
if (!thermal_event) {
if (uevent.find("SUBSYSTEM=") == 0) {
if (uevent.find("SUBSYSTEM=thermal") != std::string::npos) {
thermal_event = true;
} else {
break;
}
}
} else {
auto start_pos = uevent.find("NAME=");
if (start_pos != std::string::npos) {
start_pos += 5;
std::string name = uevent.substr(start_pos);
if (std::find(monitored_sensors_.begin(), monitored_sensors_.end(), name) !=
monitored_sensors_.end()) {
sensors_set->insert(name);
}
break;
}
}
while (*cp++) {
}
}
}
}
void ThermalWatcher::wake() {
looper_->wake();
}
bool ThermalWatcher::threadLoop() {
LOG(VERBOSE) << "ThermalWatcher polling...";
// Polling interval 2s
static constexpr int kMinPollIntervalMs = 2000;
// Max uevent timeout 5mins
static constexpr int kUeventPollTimeoutMs = 300000;
int fd;
std::set<std::string> sensors;
auto time_elapsed_ms = std::chrono::duration_cast<std::chrono::milliseconds>(boot_clock::now() -
last_update_time_)
.count();
int timeout = (thermal_triggered_ || is_polling_) ? kMinPollIntervalMs : kUeventPollTimeoutMs;
if (time_elapsed_ms < timeout && looper_->pollOnce(timeout, &fd, nullptr, nullptr) >= 0) {
if (fd != uevent_fd_.get()) {
return true;
}
parseUevent(&sensors);
// Ignore cb_ if uevent is not from monitored sensors
if (sensors.size() == 0) {
return true;
}
}
thermal_triggered_ = cb_(sensors);
last_update_time_ = boot_clock::now();
return true;
}
} // namespace implementation
} // namespace V2_0
} // namespace thermal
} // namespace hardware
} // namespace android
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