components/cpu.c

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