components/Linux/cpu.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 #include "../../util.h"
   7
   8 const char *
   9 cpu_freq(void)
  10 {
  11         int freq;
  12
  13         return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
  14                        "%i", &freq) == 1) ?
  15                bprintf("%d", (freq + 500) / 1000) : NULL;
  16 }
  17
  18 const char *
  19 cpu_perc(void)
  20 {
  21         int perc;
  22         static long double a[7];
  23         static int valid;
  24         long double b[7];
  25
  26         memcpy(b, a, sizeof(b));
  27         if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
  28                    &a[3], &a[4], &a[5], &a[6]) != 7) {
  29                 return NULL;
  30         }
  31         if (!valid) {
  32                 valid = 1;
  33                 return NULL;
  34         }
  35
  36         perc = 100 * ((b[0]+b[1]+b[2]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[5]+a[6])) /
  37                ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
  38
  39         return bprintf("%d", perc);
  40 }
  41
  42 const char *
  43 cpu_iowait(void)
  44 {
  45         int perc;
  46         static int valid;
  47         static long double a[7];
  48         long double b[7];
  49
  50         memcpy(b, a, sizeof(b));
  51         if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
  52                    &a[3], &a[4], &a[5], &a[6]) != 7) {
  53                 return NULL;
  54         }
  55         if (!valid) {
  56                 valid = 1;
  57                 return NULL;
  58         }
  59
  60         perc = 100 * ((b[4]) - (a[4])) /
  61                ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
  62
  63         return bprintf("%d", perc);
  64 }