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/*
* Copyright (C) 2019 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.
*/
#define LOG_TAG "pwrstats_util"
#include <android-base/logging.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <algorithm>
#include <chrono>
#include <csignal>
#include <fstream>
#include <iostream>
#include <pwrstatsutil.pb.h>
#include "PowerStatsCollector.h"
namespace {
volatile std::sig_atomic_t gSignalStatus;
}
static void signalHandler(int signal) {
gSignalStatus = signal;
}
class Options {
public:
bool humanReadable;
bool daemonMode;
std::string filePath;
};
static Options parseArgs(int argc, char** argv) {
Options opt = {
.humanReadable = false,
.daemonMode = false,
};
static struct option long_options[] = {/* These options set a flag. */
{"human-readable", no_argument, 0, 0},
{"daemon", required_argument, 0, 'd'},
{0, 0, 0, 0}};
// getopt_long stores the option index here
int option_index = 0;
int c;
while ((c = getopt_long(argc, argv, "d:", long_options, &option_index)) != -1) {
switch (c) {
case 0:
if ("human-readable" == std::string(long_options[option_index].name)) {
opt.humanReadable = true;
}
break;
case 'd':
opt.daemonMode = true;
opt.filePath = std::string(optarg);
break;
default: /* '?' */
std::cerr << "pwrstats_util: Prints out device power stats." << std::endl
<< "--human-readable: human-readable format" << std::endl
<< "--daemon <path/to/file>, -d <path/to/file>: daemon mode. Spawns a "
"daemon process and prints out its <pid>. kill -INT <pid> will "
"trigger a write to specified file."
<< std::endl;
exit(EXIT_FAILURE);
}
}
return opt;
}
static void snapshot(const Options& opt, const PowerStatsCollector& collector) {
std::vector<PowerStatistic> stats;
int ret = collector.get(&stats);
if (ret) {
exit(EXIT_FAILURE);
}
if (opt.humanReadable) {
collector.dump(stats, &std::cout);
} else {
for (const auto& stat : stats) {
stat.SerializeToOstream(&std::cout);
}
}
exit(EXIT_SUCCESS);
}
static void daemon(const Options& opt, const PowerStatsCollector& collector) {
// Following a subset of steps outlined in http://man7.org/linux/man-pages/man7/daemon.7.html
// Call fork to create child process
pid_t pid;
if ((pid = fork()) < 0) {
LOG(ERROR) << "can't fork" << std::endl;
exit(EXIT_FAILURE);
} else if (pid != 0) {
std::cout << "pid = " << pid << std::endl;
exit(EXIT_SUCCESS);
}
// Daemon process:
// Get maximum number of file descriptors
struct rlimit rl;
if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
LOG(ERROR) << "can't get file limit" << std::endl;
exit(EXIT_FAILURE);
}
// Close all open file descriptors
if (rl.rlim_max == RLIM_INFINITY) {
rl.rlim_max = 1024;
}
for (int i = 0; i < rl.rlim_max; i++) {
close(i);
}
// Detach from any terminal and create an independent session
if (setsid() < 0) {
LOG(ERROR) << "SID creation failed";
exit(EXIT_FAILURE);
}
// connect /dev/null to standard input, output, and error.
int devnull = open("/dev/null", O_RDWR | O_CLOEXEC);
dup2(devnull, STDIN_FILENO);
dup2(devnull, STDOUT_FILENO);
dup2(devnull, STDERR_FILENO);
// Reset the umask to 0
umask(0);
// Change the current directory to the root
// directory (/), in order to avoid that the daemon involuntarily
// blocks mount points from being unmounted
if (chdir("/") < 0) {
LOG(ERROR) << "can't change directory to /" << std::endl;
exit(EXIT_FAILURE);
}
// Install a signal handler
std::signal(SIGINT, signalHandler);
// get the start_data
auto start_time = std::chrono::system_clock::now();
std::vector<PowerStatistic> start_stats;
int ret = collector.get(&start_stats);
if (ret) {
LOG(ERROR) << "failed to get start stats";
exit(EXIT_FAILURE);
}
// Wait for INT signal
while (gSignalStatus != SIGINT) {
pause();
}
// get the end data
std::vector<PowerStatistic> interval_stats;
ret = collector.get(start_stats, &interval_stats);
if (ret) {
LOG(ERROR) << "failed to get interval stats";
exit(EXIT_FAILURE);
}
auto end_time = std::chrono::system_clock::now();
std::chrono::duration<double> elapsed_seconds = end_time - start_time;
// Write data to file
std::ofstream myfile(opt.filePath, std::ios::out | std::ios::binary);
if (!myfile.is_open()) {
LOG(ERROR) << "failed to open file";
exit(EXIT_FAILURE);
}
myfile << "elapsed time: " << elapsed_seconds.count() << "s" << std::endl;
if (opt.humanReadable) {
collector.dump(interval_stats, &myfile);
} else {
for (const auto& stat : interval_stats) {
stat.SerializeToOstream(&myfile);
}
}
myfile.close();
exit(EXIT_SUCCESS);
}
static void runWithOptions(const Options& opt, const PowerStatsCollector& collector) {
if (opt.daemonMode) {
daemon(opt, collector);
} else {
snapshot(opt, collector);
}
}
int run(int argc, char** argv, const PowerStatsCollector& collector) {
Options opt = parseArgs(argc, argv);
runWithOptions(opt, collector);
return 0;
}
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