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#define _POSIX_C_SOURCE 200809L
#include <dirent.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "hwmon.h"
// size of input buffer for paths and lines
#define BUF_SIZE 256
// size of input buffer for labels
#define LABEL_SIZE 32
static void hwmon_collect(scrape_req *req, void *ctx);
const struct collector hwmon_collector = {
.name = "hwmon",
.collect = hwmon_collect,
};
static double hwmon_conv_millis(const char *text) {
char *endptr;
double value = strtod(text, &endptr);
if (*endptr == '\n' || *endptr == '\0')
return value / 1000;
return NAN;
}
static double hwmon_conv_id(const char *text) {
char *endptr;
double value = strtod(text, &endptr);
if (*endptr == '\n' || *endptr == '\0')
return value;
return NAN;
}
static double hwmon_conv_flag(const char *text) {
if ((text[0] == '0' || text[0] == '1') && (text[1] == '\n' || text[1] == '\0'))
return text[0] - '0';
return NAN;
}
struct metric_type {
const char *suffix;
const char *metric;
double (*conv)(const char *text);
};
struct metric_data {
const char *prefix;
const struct metric_type *types;
};
static const struct metric_data metrics[] = {
{
.prefix = "in",
.types = (const struct metric_type[]){
{
.suffix = "_input",
.metric = "node_hwmon_in_volts",
.conv = hwmon_conv_millis,
},
{
.suffix = "_min",
.metric = "node_hwmon_in_min_volts",
.conv = hwmon_conv_millis,
},
{
.suffix = "_max",
.metric = "node_hwmon_in_max_volts",
.conv = hwmon_conv_millis,
},
{
.suffix = "_alarm",
.metric = "node_hwmon_in_alarm",
.conv = hwmon_conv_flag,
},
{ .suffix = 0 },
},
},
{
.prefix = "fan",
.types = (const struct metric_type[]){
{
.suffix = "_input",
.metric = "node_hwmon_fan_rpm",
.conv = hwmon_conv_id,
},
{
.suffix = "_min",
.metric = "node_hwmon_fan_min_rpm",
.conv = hwmon_conv_id,
},
{
.suffix = "_alarm",
.metric = "node_hwmon_fan_alarm",
.conv = hwmon_conv_flag,
},
{ .suffix = 0 },
},
},
{
.prefix = "temp",
.types = (const struct metric_type[]){
{
.suffix = "_input",
.metric = "node_hwmon_temp_celsius",
.conv = hwmon_conv_millis,
},
{ .suffix = 0 },
},
},
{ .prefix = 0 },
};
static void hwmon_name(const char *path, char *dst, size_t dst_len) {
char buf[BUF_SIZE];
FILE *f;
size_t len;
// if the path is a symlink to "../../devices/X/Y/...", use X/Y as the name,
// except if it is "virtual/hwmon"
len = readlink(path, buf, sizeof buf);
if (len > 14 && memcmp(buf, "../../devices/", 14) == 0) {
char *start = buf + 14;
char *end = strchr(start, '/');
if (end)
end = strchr(end + 1, '/');
if (end)
*end = '\0';
if (strcmp(start, "virtual/hwmon") != 0) {
snprintf(dst, dst_len, "%s", start);
return;
}
}
// try to use the 'name' file
snprintf(buf, sizeof buf, "%s/name", path);
f = fopen(buf, "r");
if (f) {
bool found = false;
if (fgets(buf, sizeof buf, f)) {
len = strlen(buf);
if (len > 0 && buf[len-1] == '\n') {
len--;
buf[len] = '\0';
}
if (len > 0) {
snprintf(dst, dst_len, "hwmon/%s", buf);
found = true;
}
}
fclose(f);
if (found)
return;
}
// give up, just call this unknown
// TODO: add an index
snprintf(dst, dst_len, "unknown");
}
static void hwmon_collect(scrape_req *req, void *ctx) {
// buffers
char chip_label[LABEL_SIZE];
char sensor_label[LABEL_SIZE];
const char *labels[][2] = {
{ "chip", chip_label },
{ "sensor", sensor_label },
{ 0, 0 },
};
char path[BUF_SIZE];
char buf[BUF_SIZE];
FILE *f;
DIR *root;
struct dirent *dent;
// iterate over all hwmon instances in /sys/class/hwmon
root = opendir("/sys/class/hwmon");
if (!root)
return;
while ((dent = readdir(root))) {
if (strncmp(dent->d_name, "hwmon", 5) != 0)
continue;
snprintf(path, sizeof path, "/sys/class/hwmon/%s", dent->d_name);
hwmon_name(path, chip_label, sizeof chip_label);
DIR *dir = opendir(path);
if (!dir)
continue;
while ((dent = readdir(dir))) {
for (const struct metric_data *metric = metrics; metric->prefix; metric++) {
if (strncmp(dent->d_name, metric->prefix, strlen(metric->prefix)) != 0)
continue;
char *suffix = strchr(dent->d_name, '_');
if (!suffix)
continue;
snprintf(sensor_label, sizeof sensor_label, "%.*s", (int)(suffix - dent->d_name), dent->d_name);
for (const struct metric_type *type = metric->types; type->suffix; type++) {
if (strcmp(suffix, type->suffix) != 0)
continue;
snprintf(buf, sizeof buf, "%s/%s", path, dent->d_name);
f = fopen(buf, "r");
if (!f)
continue;
if (fgets(buf, sizeof buf, f)) {
double value = type->conv(buf);
if (!isnan(value))
scrape_write(req, type->metric, labels, value);
}
fclose(f);
}
}
}
closedir(dir);
}
closedir(root);
}
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