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 #include <yajl/yajl_version.h>
   8
   9 #include "i3status.h"
  10
  11 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  12 #include <err.h>
  13 #include <sys/types.h>
  14 #include <sys/sysctl.h>
  15 #define TZ_ZEROC 2732
  16 #define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10)
  17 #endif
  18
  19 static char *thermal_zone;
  20
  21 /*
  22  * Reads the CPU temperature from /sys/class/thermal/thermal_zone0/temp and
  23  * returns the temperature in degree celcius.
  24  *
  25  */
  26 void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const char *path, const char *format) {
  27 #ifdef THERMAL_ZONE
  28         const char *walk;
  29         char *outwalk = buffer;
  30         static char buf[16];
  31
  32         if (path == NULL) {
  33                 asprintf(&thermal_zone, THERMAL_ZONE, zone);
  34                 path = thermal_zone;
  35         }
  36
  37         INSTANCE(path);
  38
  39         for (walk = format; *walk != '\0'; walk++) {
  40                 if (*walk != '%') {
  41                         *(outwalk++) = *walk;
  42                         continue;
  43                 }
  44
  45                 if (BEGINS_WITH(walk+1, "degrees")) {
  46 #if defined(LINUX)
  47                         long int temp;
  48                         if (!slurp(path, buf, sizeof(buf)))
  49                                 goto error;
  50                         temp = strtol(buf, NULL, 10);
  51                         if (temp == LONG_MIN || temp == LONG_MAX || temp <= 0)
  52                                 *(outwalk++) = '?';
  53                         else
  54                                 outwalk += sprintf(outwalk, "%ld", (temp/1000));
  55 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  56                         int sysctl_rslt;
  57                         size_t sysctl_size = sizeof(sysctl_rslt);
  58                         if (sysctlbyname(path, &sysctl_rslt, &sysctl_size, NULL, 0))
  59                                 goto error;
  60
  61                         outwalk += sprintf(outwalk, "%d.%d", TZ_KELVTOC(sysctl_rslt));
  62 #endif
  63                         walk += strlen("degrees");
  64                 }
  65         }
  66
  67         OUTPUT_FULL_TEXT(buffer);
  68         return;
  69 error:
  70 #endif
  71         (void)fputs("Cannot read temperature\n", stderr);
  72 }