122 lines
No EOL
2.8 KiB
C
122 lines
No EOL
2.8 KiB
C
#define _GNU_SOURCE
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#include <limits.h>
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#include <stdio.h>
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#include <dirent.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <time.h>
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#define SENSOR 1
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int read_temperature(char *filename) {
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FILE *fp;
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fp = fopen(filename, "r");
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if (fp == NULL) {
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fprintf(stderr, "Error opening file %s: %s\n", filename, strerror(errno)); // instead of perror
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return INT_MIN;
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}
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char buffer[6]; // because the file returns 5 digits + null terminator
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if (fgets(buffer, sizeof(buffer), fp) == NULL) {
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fprintf(stderr, "Error reading from %s: %s\n", filename, strerror(errno));
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fclose(fp);
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return INT_MIN;
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}
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fclose(fp);
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int temperature = strtol(buffer, NULL, 10);
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return temperature;
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}
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int detect_ds18b20(char *w1_id) {
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DIR *d;
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struct dirent *dir;
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d = opendir("/sys/bus/w1/devices");
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bool success = false;
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if (d) {
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while ((dir = readdir(d)) != NULL) {
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strcpy(w1_id, dir->d_name);
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if (strncmp("28", w1_id, 2) == 0) {
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success = true;
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}
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}
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closedir(d);
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} else {
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perror("Unable to open w1 directory");
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}
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if (success) return 0;
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return 1;
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}
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int read_cpu_temperature() {
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return read_temperature("/sys/class/thermal/thermal_zone0/temp");
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}
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int read_w1_temperature(char *w1_id) {
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char *path;
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if (asprintf(&path, "/sys/bus/w1/devices/%s/temperature", w1_id) == -1) {
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fprintf(stderr, "Unable to get path for %s: %s\n", w1_id, strerror(errno));
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return INT_MIN;
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}
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return read_temperature(path);
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}
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int main(int argc, char *argv[]) {
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if (argc < 2) {
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printf("Filename required\n");
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return 1;
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}
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time_t now = time(0);
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char *line;
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int cpu_temperature;
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if ((cpu_temperature = read_cpu_temperature()) == INT_MIN) {
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perror("Failed to read cpu temperature");
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return 1;
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}
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if (SENSOR) {
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char w1_id[16];
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if ((detect_ds18b20(w1_id)) == 1)
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return 1;
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printf("Using sensor: %s\n", w1_id);
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int env_temperature;
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if ((env_temperature = read_w1_temperature(w1_id)) == INT_MIN) {
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perror("Failed to read env temperature");
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return 1;
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}
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asprintf(&line, "%ld,%d,%d\n", now, cpu_temperature, env_temperature);
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printf("timestamp,cpu_temp,env_temp\n%s", line);
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} else {
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asprintf(&line, "%ld,%d\n", now, cpu_temperature);
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printf("timestamp,cpu_temp\n%s", line);
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}
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FILE *fp;
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fp = fopen(argv[1], "a");
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if (fp == NULL) {
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perror("Error opening output file");
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return 1;
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}
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if (fprintf(fp, line) < 0) {
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perror("Error writing to output file");
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fclose(fp);
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return 1;
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}
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fclose(fp);
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} |