components/temperature.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stddef.h>
   3
   4 #include "../util.h"
   5
   6
   7 #if defined(__linux__)
   8         #include <stdint.h>
   9
  10         const char *
  11         temp(const char *file)
  12         {
  13                 uintmax_t temp;
  14
  15                 if (pscanf(file, "%ju", &temp) != 1) {
  16                         return NULL;
  17                 }
  18
  19                 return bprintf("%ju", temp / 1000);
  20         }
  21 #elif defined(__OpenBSD__)
  22         #include <stdio.h>
  23         #include <sys/time.h> /* before <sys/sensors.h> for struct timeval */
  24         #include <sys/sensors.h>
  25         #include <sys/sysctl.h>
  26
  27         const char *
  28         temp(const char *unused)
  29         {
  30                 int mib[5];
  31                 size_t size;
  32                 struct sensor temp;
  33
  34                 mib[0] = CTL_HW;
  35                 mib[1] = HW_SENSORS;
  36                 mib[2] = 0; /* cpu0 */
  37                 mib[3] = SENSOR_TEMP;
  38                 mib[4] = 0; /* temp0 */
  39
  40                 size = sizeof(temp);
  41
  42                 if (sysctl(mib, 5, &temp, &size, NULL, 0) < 0) {
  43                         warn("sysctl 'SENSOR_TEMP':");
  44                         return NULL;
  45                 }
  46
  47                 /* kelvin to celsius */
  48                 return bprintf("%d", (temp.value - 273150000) / 1E6);
  49         }
  50 #elif defined(__FreeBSD__)
  51         #include <stdio.h>
  52         #include <stdlib.h>
  53         #include <sys/sysctl.h>
  54
  55         const char *
  56         temp(const char *zone)
  57         {
  58                 char buf[256];
  59                 int temp;
  60                 size_t len;
  61
  62                 len = sizeof(temp);
  63                 snprintf(buf, sizeof(buf), "hw.acpi.thermal.%s.temperature", zone);
  64                 if (sysctlbyname(buf, &temp, &len, NULL, 0) == -1
  65                                 || !len)
  66                         return NULL;
  67
  68                 /* kelvin to decimal celcius */
  69                 return bprintf("%d.%d", (temp - 2731) / 10, abs((temp - 2731) % 10));
  70         }
  71 #endif