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                 return (pscanf(file, "%d", &temp) == 1) ?
  13                        bprintf("%d", temp / 1000) : NULL;
  14         }
  15 #elif defined(__OpenBSD__)
  16         #include <errno.h>
  17         #include <stdio.h>
  18         #include <string.h>
  19         #include <sys/time.h> /* before <sys/sensors.h> for struct timeval */
  20         #include <sys/sensors.h>
  21         #include <sys/sysctl.h>
  22
  23         const char *
  24         temp(const char *file)
  25         {
  26                 int mib[5];
  27                 size_t size;
  28                 struct sensor temp;
  29
  30                 UNUSED(file); /* no temperature file on OpenBSD */
  31
  32                 mib[0] = CTL_HW;
  33                 mib[1] = HW_SENSORS;
  34                 mib[2] = 0; /* cpu0 */
  35                 mib[3] = SENSOR_TEMP;
  36                 mib[4] = 0; /* temp0 */
  37
  38                 size = sizeof(temp);
  39
  40                 if (sysctl(mib, 5, &temp, &size, NULL, 0) < 0) {
  41                         fprintf(stderr, "sysctl 'SENSOR_TEMP': %s\n",
  42                                 strerror(errno));
  43                         return NULL;
  44                 }
  45
  46                 /* kelvin to celsius */
  47                 return bprintf("%d", (temp.value - 273150000) / 1000000);
  48         }
  49 #endif