// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <[email protected]>
#define _GNU_SOURCE
#include <dirent.h>
#include <fcntl.h>
#include <getopt.h>
#include <regex.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/signalfd.h>
#include <sys/timerfd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <linux/thermal.h>
#include <libconfig.h>
#include "thermal-tools.h"
#define CLASS_THERMAL "/sys/class/thermal"
enum {
THERMOMETER_SUCCESS = 0,
THERMOMETER_OPTION_ERROR,
THERMOMETER_LOG_ERROR,
THERMOMETER_CONFIG_ERROR,
THERMOMETER_TIME_ERROR,
THERMOMETER_INIT_ERROR,
THERMOMETER_RUNTIME_ERROR
};
struct options {
int loglvl;
int logopt;
int overwrite;
int duration;
const char *config;
char postfix[PATH_MAX];
char output[PATH_MAX];
};
struct tz_regex {
regex_t regex;
int polling;
};
struct configuration {
struct tz_regex *tz_regex;
int nr_tz_regex;
};
struct tz {
FILE *file_out;
int fd_temp;
int fd_timer;
int polling;
const char *name;
};
struct thermometer {
struct tz *tz;
int nr_tz;
};
static struct tz_regex *configuration_tz_match(const char *expr,
struct configuration *config)
{
int i;
for (i = 0; i < config->nr_tz_regex; i++) {
if (!regexec(&config->tz_regex[i].regex, expr, 0, NULL, 0))
return &config->tz_regex[i];
}
return NULL;
}
static int configuration_default_init(struct configuration *config)
{
config->tz_regex = realloc(config->tz_regex, sizeof(*config->tz_regex) *
(config->nr_tz_regex + 1));
if (regcomp(&config->tz_regex[config->nr_tz_regex].regex, ".*",
REG_NOSUB | REG_EXTENDED)) {
ERROR("Invalid regular expression\n");
return -1;
}
config->tz_regex[config->nr_tz_regex].polling = 250;
config->nr_tz_regex = 1;
return 0;
}
static int configuration_init(const char *path, struct configuration *config)
{
config_t cfg;
config_setting_t *tz;
int i, length;
if (path && access(path, F_OK)) {
ERROR("'%s' is not accessible\n", path);
return -1;
}
if (!path && !config->nr_tz_regex) {
INFO("No thermal zones configured, using wildcard for all of them\n");
return configuration_default_init(config);
}
config_init(&cfg);
if (!config_read_file(&cfg, path)) {
ERROR("Failed to parse %s:%d - %s\n", config_error_file(&cfg),
config_error_line(&cfg), config_error_text(&cfg));
return -1;
}
tz = config_lookup(&cfg, "thermal-zones");
if (!tz) {
ERROR("No thermal zone configured to be monitored\n");
return -1;
}
length = config_setting_length(tz);
INFO("Found %d thermal zone(s) regular expression\n", length);
for (i = 0; i < length; i++) {
config_setting_t *node;
const char *name;
int polling;
node = config_setting_get_elem(tz, i);
if (!node) {
ERROR("Missing node name '%d'\n", i);
return -1;
}
if (!config_setting_lookup_string(node, "name", &name)) {
ERROR("Thermal zone name not found\n");
return -1;
}
if (!config_setting_lookup_int(node, "polling", &polling)) {
ERROR("Polling value not found");
return -1;
}
config->tz_regex = realloc(config->tz_regex, sizeof(*config->tz_regex) *
(config->nr_tz_regex + 1));
if (regcomp(&config->tz_regex[config->nr_tz_regex].regex, name,
REG_NOSUB | REG_EXTENDED)) {
ERROR("Invalid regular expression '%s'\n", name);
continue;
}
config->tz_regex[config->nr_tz_regex].polling = polling;
config->nr_tz_regex++;
INFO("Thermal zone regular expression '%s' with polling %d\n",
name, polling);
}
return 0;
}
static void usage(const char *cmd)
{
printf("%s Version: %s\n", cmd, VERSION);
printf("Usage: %s [options]\n", cmd);
printf("\t-h, --help\t\tthis help\n");
printf("\t-o, --output <dir>\toutput directory for temperature capture\n");
printf("\t-c, --config <file>\tconfiguration file\n");
printf("\t-d, --duration <seconds>\tcapture duration\n");
printf("\t-l, --loglevel <level>\tlog level: ");
printf("DEBUG, INFO, NOTICE, WARN, ERROR\n");
printf("\t-p, --postfix <string>\tpostfix to be happened at the end of the files\n");
printf("\t-s, --syslog\t\toutput to syslog\n");
printf("\t-w, --overwrite\t\toverwrite the temperature capture files if they exist\n");
printf("\n");
exit(0);
}
static int options_init(int argc, char *argv[], struct options *options)
{
int opt;
time_t now = time(NULL);
struct option long_options[] = {
{ "help", no_argument, NULL, 'h' },
{ "config", required_argument, NULL, 'c' },
{ "duration", required_argument, NULL, 'd' },
{ "loglevel", required_argument, NULL, 'l' },
{ "postfix", required_argument, NULL, 'p' },
{ "output", required_argument, NULL, 'o' },
{ "syslog", required_argument, NULL, 's' },
{ "overwrite", no_argument, NULL, 'w' },
{ 0, 0, 0, 0 }
};
strftime(options->postfix, sizeof(options->postfix),
"-%Y-%m-%d_%H:%M:%S", gmtime(&now));
while (1) {
int optindex = 0;
opt = getopt_long(argc, argv, "ho:c:d:l:p:sw", long_options, &optindex);
if (opt == -1)
break;
switch (opt) {
case 'c':
options->config = optarg;
break;
case 'd':
options->duration = atoi(optarg) * 1000;
break;
case 'l':
options->loglvl = log_str2level(optarg);
break;
case 'h':
usage(basename(argv[0]));
break;
case 'p':
strcpy(options->postfix, optarg);
break;
case 'o':
strcpy(options->output, optarg);
break;
case 's':
options->logopt = TO_SYSLOG;
break;
case 'w':
options->overwrite = 1;
break;
default: /* '?' */
ERROR("Usage: %s --help\n", argv[0]);
return -1;
}
}
return 0;
}
static int thermometer_add_tz(const char *path, const char *name, int polling,
struct thermometer *thermometer)
{
int fd;
char tz_path[PATH_MAX];
sprintf(tz_path, CLASS_THERMAL"/%s/temp", path);
fd = open(tz_path, O_RDONLY);
if (fd < 0) {
ERROR("Failed to open '%s': %m\n", tz_path);
return -1;
}
thermometer->tz = realloc(thermometer->tz,
sizeof(*thermometer->tz) * (thermometer->nr_tz + 1));
if (!thermometer->tz) {
ERROR("Failed to allocate thermometer->tz\n");
return -1;
}
thermometer->tz[thermometer->nr_tz].fd_temp = fd;
thermometer->tz[thermometer->nr_tz].name = strdup(name);
thermometer->tz[thermometer->nr_tz].polling = polling;
thermometer->nr_tz++;
INFO("Added thermal zone '%s->%s (polling:%d)'\n", path, name, polling);
return 0;
}
static int thermometer_init(struct configuration *config,
struct thermometer *thermometer)
{
DIR *dir;
struct dirent *dirent;
struct tz_regex *tz_regex;
const char *tz_dirname = "thermal_zone";
if (mainloop_init()) {
ERROR("Failed to start mainloop\n");
return -1;
}
dir = opendir(CLASS_THERMAL);
if (!dir) {
ERROR("failed to open '%s'\n", CLASS_THERMAL);
return -1;
}
while ((dirent = readdir(dir))) {
char tz_type[THERMAL_NAME_LENGTH];
char tz_path[PATH_MAX];
FILE *tz_file;
if (strncmp(dirent->d_name, tz_dirname, strlen(tz_dirname)))
continue;
sprintf(tz_path, CLASS_THERMAL"/%s/type", dirent->d_name);
tz_file = fopen(tz_path, "r");
if (!tz_file) {
ERROR("Failed to open '%s': %m", tz_path);
continue;
}
fscanf(tz_file, "%s", tz_type);
fclose(tz_file);
tz_regex = configuration_tz_match(tz_type, config);
if (!tz_regex)
continue;
if (thermometer_add_tz(dirent->d_name, tz_type,
tz_regex->polling, thermometer))
continue;
}
closedir(dir);
return 0;
}
static int timer_temperature_callback(int fd, void *arg)
{
struct tz *tz = arg;
char buf[16] = { 0 };
pread(tz->fd_temp, buf, sizeof(buf), 0);
fprintf(tz->file_out, "%ld %s", getuptimeofday_ms(), buf);
read(fd, buf, sizeof(buf));
return 0;
}
static int thermometer_start(struct thermometer *thermometer,
struct options *options)
{
struct itimerspec timer_it = { 0 };
char *path;
FILE *f;
int i;
INFO("Capturing %d thermal zone(s) temperature...\n", thermometer->nr_tz);
if (access(options->output, F_OK) && mkdir(options->output, 0700)) {
ERROR("Failed to create directory '%s'\n", options->output);
return -1;
}
for (i = 0; i < thermometer->nr_tz; i++) {
asprintf(&path, "%s/%s%s", options->output,
thermometer->tz[i].name, options->postfix);
if (!options->overwrite && !access(path, F_OK)) {
ERROR("'%s' already exists\n", path);
return -1;
}
f = fopen(path, "w");
if (!f) {
ERROR("Failed to create '%s':%m\n", path);
return -1;
}
fprintf(f, "timestamp(ms) %s(°mC)\n", thermometer->tz[i].name);
thermometer->tz[i].file_out = f;
DEBUG("Created '%s' file for thermal zone '%s'\n", path, thermometer->tz[i].name);
/*
* Create polling timer
*/
thermometer->tz[i].fd_timer = timerfd_create(CLOCK_MONOTONIC, 0);
if (thermometer->tz[i].fd_timer < 0) {
ERROR("Failed to create timer for '%s': %m\n",
thermometer->tz[i].name);
return -1;
}
DEBUG("Watching '%s' every %d ms\n",
thermometer->tz[i].name, thermometer->tz[i].polling);
timer_it.it_interval = timer_it.it_value =
msec_to_timespec(thermometer->tz[i].polling);
if (timerfd_settime(thermometer->tz[i].fd_timer, 0,
&timer_it, NULL) < 0)
return -1;
if (mainloop_add(thermometer->tz[i].fd_timer,
timer_temperature_callback,
&thermometer->tz[i]))
return -1;
}
return 0;
}
static int thermometer_execute(int argc, char *argv[], char *const envp[], pid_t *pid)
{
if (!argc)
return 0;
*pid = fork();
if (*pid < 0) {
ERROR("Failed to fork process: %m");
return -1;
}
if (!(*pid)) {
execvpe(argv[0], argv, envp);
exit(1);
}
return 0;
}
static int kill_process(__maybe_unused int fd, void *arg)
{
pid_t pid = *(pid_t *)arg;
if (kill(pid, SIGTERM))
ERROR("Failed to send SIGTERM signal to '%d': %p\n", pid);
else if (waitpid(pid, NULL, 0))
ERROR("Failed to wait pid '%d': %p\n", pid);
mainloop_exit();
return 0;
}
static int exit_mainloop(__maybe_unused int fd, __maybe_unused void *arg)
{
mainloop_exit();
return 0;
}
static int thermometer_wait(struct options *options, pid_t pid)
{
int fd;
sigset_t mask;
/*
* If there is a duration specified, we will exit the mainloop
* and gracefully close all the files which will flush the
* file system cache
*/
if (options->duration) {
struct itimerspec timer_it = { 0 };
timer_it.it_value = msec_to_timespec(options->duration);
fd = timerfd_create(CLOCK_MONOTONIC, 0);
if (fd < 0) {
ERROR("Failed to create duration timer: %m\n");
return -1;
}
if (timerfd_settime(fd, 0, &timer_it, NULL)) {
ERROR("Failed to set timer time: %m\n");
return -1;
}
if (mainloop_add(fd, pid < 0 ? exit_mainloop : kill_process, &pid)) {
ERROR("Failed to set timer exit mainloop callback\n");
return -1;
}
}
/*
* We want to catch any keyboard interrupt, as well as child
* signals if any in order to exit properly
*/
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGQUIT);
sigaddset(&mask, SIGCHLD);
if (sigprocmask(SIG_BLOCK, &mask, NULL)) {
ERROR("Failed to set sigprocmask: %m\n");
return -1;
}
fd = signalfd(-1, &mask, 0);
if (fd < 0) {
ERROR("Failed to set the signalfd: %m\n");
return -1;
}
if (mainloop_add(fd, exit_mainloop, NULL)) {
ERROR("Failed to set timer exit mainloop callback\n");
return -1;
}
return mainloop(-1);
}
static int thermometer_stop(struct thermometer *thermometer)
{
int i;
INFO("Closing/flushing output files\n");
for (i = 0; i < thermometer->nr_tz; i++)
fclose(thermometer->tz[i].file_out);
return 0;
}
int main(int argc, char *argv[], char *const envp[])
{
struct options options = {
.loglvl = LOG_DEBUG,
.logopt = TO_STDOUT,
.output = ".",
};
struct configuration config = { 0 };
struct thermometer thermometer = { 0 };
pid_t pid = -1;
if (options_init(argc, argv, &options))
return THERMOMETER_OPTION_ERROR;
if (log_init(options.loglvl, argv[0], options.logopt))
return THERMOMETER_LOG_ERROR;
if (configuration_init(options.config, &config))
return THERMOMETER_CONFIG_ERROR;
if (uptimeofday_init())
return THERMOMETER_TIME_ERROR;
if (thermometer_init(&config, &thermometer))
return THERMOMETER_INIT_ERROR;
if (thermometer_start(&thermometer, &options))
return THERMOMETER_RUNTIME_ERROR;
if (thermometer_execute(argc - optind, &argv[optind], envp, &pid))
return THERMOMETER_RUNTIME_ERROR;
if (thermometer_wait(&options, pid))
return THERMOMETER_RUNTIME_ERROR;
if (thermometer_stop(&thermometer))
return THERMOMETER_RUNTIME_ERROR;
return THERMOMETER_SUCCESS;
}
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