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