components/cpu.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #if defined(__OpenBSD__)
   6 #include <sys/sysctl.h>
   7 #endif
   8
   9 #include "../util.h"
  10
  11 #if defined(__linux__)
  12 const char *
  13 cpu_freq(void)
  14 {
  15         int freq;
  16
  17         return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
  18                        "%i", &freq) == 1) ?
  19                bprintf("%d", (freq + 500) / 1000) : NULL;
  20 }
  21
  22 const char *
  23 cpu_perc(void)
  24 {
  25         int perc;
  26         static long double a[7];
  27         static int valid;
  28         long double b[7];
  29
  30         memcpy(b, a, sizeof(b));
  31         if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
  32                    &a[3], &a[4], &a[5], &a[6]) != 7) {
  33                 return NULL;
  34         }
  35         if (!valid) {
  36                 valid = 1;
  37                 return NULL;
  38         }
  39
  40         perc = 100 * ((b[0]+b[1]+b[2]+b[5]+b[6]) - (a[0]+a[1]+a[2]+a[5]+a[6])) /
  41                ((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]));
  42
  43         return bprintf("%d", perc);
  44 }
  45
  46 const char *
  47 cpu_iowait(void)
  48 {
  49         int perc;
  50         static int valid;
  51         static long double a[7];
  52         long double b[7];
  53
  54         memcpy(b, a, sizeof(b));
  55         if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf", &a[0], &a[1], &a[2],
  56                    &a[3], &a[4], &a[5], &a[6]) != 7) {
  57                 return NULL;
  58         }
  59         if (!valid) {
  60                 valid = 1;
  61                 return NULL;
  62         }
  63
  64         perc = 100 * ((b[4]) - (a[4])) /
  65                ((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]));
  66
  67         return bprintf("%d", perc);
  68 }
  69 #elif defined(__OpenBSD__)
  70 const char *
  71 cpu_freq(void)
  72 {
  73         int freq, mib[2];
  74         size_t size;
  75
  76         mib[0] = CTL_HW;
  77         mib[1] = HW_CPUSPEED;
  78
  79         size = sizeof(freq);
  80
  81         if (sysctl(mib, 2, &freq, &size, NULL, 0) == -1) {
  82                 fprintf(stderr, "sysctl 'HW_CPUSPEED': %s\n", strerror(errno));
  83                 return NULL;
  84         }
  85
  86         return bprintf("%d", freq);
  87 }
  88 #endif