git.sur5r.net Git - i3/i3status/blob - src/print_cpu_temperature.c

   1 // vim:ts=8:expandtab
   2 #include <stdlib.h>
   3 #include <limits.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <yajl/yajl_gen.h>
   7
   8 #include "i3status.h"
   9
  10 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  11 #include <err.h>
  12 #include <sys/types.h>
  13 #include <sys/sysctl.h>
  14 #define TZ_ZEROC 2732
  15 #define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10)
  16 #endif
  17
  18 static char *thermal_zone;
  19
  20 /*
  21  * Reads the CPU temperature from /sys/class/thermal/thermal_zone0/temp and
  22  * returns the temperature in degree celcius.
  23  *
  24  */
  25 void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const char *path, const char *format) {
  26 #ifdef THERMAL_ZONE
  27         const char *walk;
  28         char *outwalk = buffer;
  29         static char buf[16];
  30
  31         if (path == NULL) {
  32                 asprintf(&thermal_zone, THERMAL_ZONE, zone);
  33                 path = thermal_zone;
  34         }
  35
  36         INSTANCE(path);
  37
  38         for (walk = format; *walk != '\0'; walk++) {
  39                 if (*walk != '%') {
  40                         *(outwalk++) = *walk;
  41                         continue;
  42                 }
  43
  44                 if (BEGINS_WITH(walk+1, "degrees")) {
  45 #if defined(LINUX)
  46                         long int temp;
  47                         if (!slurp(path, buf, sizeof(buf)))
  48                                 goto error;
  49                         temp = strtol(buf, NULL, 10);
  50                         if (temp == LONG_MIN || temp == LONG_MAX || temp <= 0)
  51                                 *(outwalk++) = '?';
  52                         else
  53                                 outwalk += sprintf(outwalk, "%ld", (temp/1000));
  54 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  55                         int sysctl_rslt;
  56                         size_t sysctl_size = sizeof(sysctl_rslt);
  57                         if (sysctlbyname(path, &sysctl_rslt, &sysctl_size, NULL, 0))
  58                                 goto error;
  59
  60                         outwalk += sprintf(outwalk, "%d.%d", TZ_KELVTOC(sysctl_rslt));
  61 #endif
  62                         walk += strlen("degrees");
  63                 }
  64         }
  65
  66         OUTPUT_FULL_TEXT(buffer);
  67         return;
  68 error:
  69 #endif
  70         (void)fputs("Cannot read temperature\n", stderr);
  71 }