components/temperature.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stddef.h>
   3
   4 #include "../util.h"
   5
   6 #if defined(__linux__)
   7         #include <stdint.h>
   8
   9         const char *
  10         temp(const char *file)
  11         {
  12                 uintmax_t temp;
  13
  14                 if (pscanf(file, "%ju", &temp) != 1) {
  15                         return NULL;
  16                 }
  17
  18                 return bprintf("%ju", temp / 1000);
  19         }
  20 #elif defined(__OpenBSD__)
  21         #include <stdio.h>
  22         #include <sys/time.h> /* before <sys/sensors.h> for struct timeval */
  23         #include <sys/sensors.h>
  24         #include <sys/sysctl.h>
  25
  26         const char *
  27         temp(const char *unused)
  28         {
  29                 int mib[5];
  30                 size_t size;
  31                 struct sensor temp;
  32
  33                 mib[0] = CTL_HW;
  34                 mib[1] = HW_SENSORS;
  35                 mib[2] = 0; /* cpu0 */
  36                 mib[3] = SENSOR_TEMP;
  37                 mib[4] = 0; /* temp0 */
  38
  39                 size = sizeof(temp);
  40
  41                 if (sysctl(mib, 5, &temp, &size, NULL, 0) < 0) {
  42                         warn("sysctl 'SENSOR_TEMP':");
  43                         return NULL;
  44                 }
  45
  46                 /* kelvin to celsius */
  47                 return bprintf("%d", (temp.value - 273150000) / 1E6);
  48         }
  49 #endif