git.sur5r.net Git - i3/i3status/blob - src/print_cpu_temperature.c

   1 // vim:ts=8:expandtab
   2 #include <stdlib.h>
   3 #include <limits.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <yajl/yajl_gen.h>
   7 #include <yajl/yajl_version.h>
   8
   9 #include "i3status.h"
  10
  11 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  12 #include <err.h>
  13 #include <sys/types.h>
  14 #include <sys/sysctl.h>
  15 #define TZ_ZEROC 2732
  16 #define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10)
  17 #endif
  18
  19 #if defined(__OpenBSD__)
  20 #include <sys/param.h>
  21 #include <sys/types.h>
  22 #include <sys/sysctl.h>
  23 #include <sys/sensors.h>
  24 #include <errno.h>
  25 #include <err.h>
  26 #endif
  27
  28 static char *thermal_zone;
  29
  30 /*
  31  * Reads the CPU temperature from /sys/class/thermal/thermal_zone0/temp and
  32  * returns the temperature in degree celcius.
  33  *
  34  */
  35 void print_cpu_temperature_info(yajl_gen json_gen, char *buffer, int zone, const char *path, const char *format) {
  36 #ifdef THERMAL_ZONE
  37         const char *walk;
  38         char *outwalk = buffer;
  39         static char buf[16];
  40
  41         if (path == NULL)
  42                 asprintf(&thermal_zone, THERMAL_ZONE, zone);
  43         else
  44                 asprintf(&thermal_zone, path, zone);
  45         path = thermal_zone;
  46
  47         INSTANCE(path);
  48
  49         for (walk = format; *walk != '\0'; walk++) {
  50                 if (*walk != '%') {
  51                         *(outwalk++) = *walk;
  52                         continue;
  53                 }
  54
  55                 if (BEGINS_WITH(walk+1, "degrees")) {
  56 #if defined(LINUX)
  57                         long int temp;
  58                         if (!slurp(path, buf, sizeof(buf)))
  59                                 goto error;
  60                         temp = strtol(buf, NULL, 10);
  61                         if (temp == LONG_MIN || temp == LONG_MAX || temp <= 0)
  62                                 *(outwalk++) = '?';
  63                         else
  64                                 outwalk += sprintf(outwalk, "%ld", (temp/1000));
  65 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  66                         int sysctl_rslt;
  67                         size_t sysctl_size = sizeof(sysctl_rslt);
  68                         if (sysctlbyname(path, &sysctl_rslt, &sysctl_size, NULL, 0))
  69                                 goto error;
  70
  71                         outwalk += sprintf(outwalk, "%d.%d", TZ_KELVTOC(sysctl_rslt));
  72 #elif defined(__OpenBSD__)
  73         struct sensordev sensordev;
  74         struct sensor sensor;
  75         size_t sdlen, slen;
  76         int dev, numt, mib[5] = { CTL_HW, HW_SENSORS, 0, 0, 0 };
  77
  78         sdlen = sizeof(sensordev);
  79         slen = sizeof(sensor);
  80
  81         for (dev = 0; ; dev++) {
  82                 mib[2] = dev;
  83                 if (sysctl(mib, 3, &sensordev, &sdlen, NULL, 0) == -1) {
  84                         if (errno == ENXIO)
  85                                 continue;
  86                         if (errno == ENOENT)
  87                                 break;
  88                         goto error;
  89                 }
  90                 /*
  91                  * 'path' is actually the node within the full path (eg, cpu0).
  92                  * XXX: Extend the API to allow a string instead of just an int for path, this would
  93                  * allow us to have a path of 'acpitz0' for example.
  94                  */
  95                 if (strncmp(sensordev.xname, path, strlen(path)) == 0) {
  96                         mib[3] = SENSOR_TEMP;
  97                         for (numt = 0; numt < sensordev.maxnumt[SENSOR_TEMP]; numt++) {
  98                                 mib[4] = numt;
  99                                 if (sysctl(mib, 5, &sensor, &slen, NULL, 0) == -1) {
 100                                         if (errno != ENOENT)
 101                                                 warn("sysctl");
 102                                         continue;
 103                                 }
 104                                 outwalk += sprintf(outwalk, "%.2f", (sensor.value - 273150000) / 1000000.0 );
 105                         }
 106                 }
 107         }
 108 #endif
 109                         walk += strlen("degrees");
 110                 }
 111         }
 112         OUTPUT_FULL_TEXT(buffer);
 113         return;
 114 error:
 115 #endif
 116         (void)fputs("i3status: Cannot read temperature. Verify that you have a thermal zone in /sys/class/thermal or disable the cpu_temperature module in your i3status config.\n", stderr);
 117 }