cpu.c

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