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
   7 #include "i3status.h"
   8
   9 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  10 #include <err.h>
  11 #include <sys/types.h>
  12 #include <sys/sysctl.h>
  13 #define TZ_ZEROC 2732
  14 #define TZ_KELVTOC(x) (((x) - TZ_ZEROC) / 10), abs(((x) - TZ_ZEROC) % 10)
  15 #endif
  16
  17 static char *thermal_zone;
  18
  19 /*
  20  * Reads the CPU temperature from /sys/class/thermal/thermal_zone0/temp and
  21  * returns the temperature in degree celcius.
  22  *
  23  */
  24 void print_cpu_temperature_info(int zone, const char *path, const char *format) {
  25 #ifdef THERMAL_ZONE
  26         const char *walk;
  27         static char buf[16];
  28
  29         if (path == NULL) {
  30                 asprintf(&thermal_zone, THERMAL_ZONE, zone);
  31                 path = thermal_zone;
  32         }
  33
  34         if (output_format == O_I3BAR)
  35                 printf("{\"name\":\"cpu_temperature\", \"instance\": \"%s\", \"full_text\":\"", path);
  36
  37         for (walk = format; *walk != '\0'; walk++) {
  38                 if (*walk != '%') {
  39                         putchar(*walk);
  40                         continue;
  41                 }
  42
  43                 if (BEGINS_WITH(walk+1, "degrees")) {
  44 #if defined(LINUX)
  45                         long int temp;
  46                         if (!slurp(path, buf, sizeof(buf)))
  47                                 goto error;
  48                         temp = strtol(buf, NULL, 10);
  49                         if (temp == LONG_MIN || temp == LONG_MAX || temp <= 0)
  50                                 (void)printf("?");
  51                         else
  52                                 (void)printf("%ld", (temp/1000));
  53 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  54                         int sysctl_rslt;
  55                         size_t sysctl_size = sizeof(sysctl_rslt);
  56                         if (sysctlbyname(path, &sysctl_rslt, &sysctl_size, NULL, 0))
  57                                 goto error;
  58
  59                         (void)printf("%d.%d", TZ_KELVTOC(sysctl_rslt));
  60 #endif
  61                         walk += strlen("degrees");
  62                 }
  63         }
  64
  65         if (output_format == O_I3BAR)
  66                 printf("\"}");
  67
  68         return;
  69 error:
  70 #endif
  71         (void)fputs("Cannot read temperature\n", stderr);
  72 }