components/OpenBSD/temperature.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #include <sys/sysctl.h>
   6 #include <sys/time.h>
   7 #include <sys/sensors.h>
   8
   9 #include "../../util.h"
  10
  11 const char *
  12 temp(const char *null)
  13 {
  14         int mib[5];
  15         size_t size;
  16         struct sensor temp;
  17
  18         mib[0] = CTL_HW;
  19         mib[1] = HW_SENSORS;
  20         mib[2] = 0; /* cpu0 */
  21         mib[3] = SENSOR_TEMP;
  22         mib[4] = 0; /* temp0 */
  23
  24         size = sizeof(temp);
  25
  26         if (sysctl(mib, 5, &temp, &size, NULL, 0) == -1) {
  27                 fprintf(stderr, "sysctl 'SENSOR_TEMP': %s\n", strerror(errno));
  28                 return NULL;
  29         }
  30
  31         return bprintf("%d", (temp.value - 273150000) / 1000000); /* kelvin to celsius */
  32 }