components/cpu.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdint.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 #include "../util.h"
   7
   8 #if defined(__linux__)
   9         const char *
  10         cpu_freq(void)
  11         {
  12                 uintmax_t freq;
  13
  14                 /* in kHz */
  15                 if (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
  16                             "%ju", &freq) != 1) {
  17                         return NULL;
  18                 }
  19
  20                 return fmt_human(freq * 1000, 1000);
  21         }
  22
  23         const char *
  24         cpu_perc(void)
  25         {
  26                 static long double a[7];
  27                 long double b[7];
  28
  29                 memcpy(b, a, sizeof(b));
  30                 /* cpu user nice system idle iowait irq softirq */
  31                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  32                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
  33                         return NULL;
  34                 }
  35                 if (b[0] == 0) {
  36                         return NULL;
  37                 }
  38
  39                 return bprintf("%d", (int)(100 *
  40                                ((b[0] + b[1] + b[2] + b[5] + b[6]) -
  41                                 (a[0] + a[1] + a[2] + a[5] + a[6])) /
  42                                ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
  43                                 (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]))));
  44         }
  45 #elif defined(__OpenBSD__)
  46         #include <sys/param.h>
  47         #include <sys/sched.h>
  48         #include <sys/sysctl.h>
  49
  50         const char *
  51         cpu_freq(void)
  52         {
  53                 int mib[2];
  54                 uintmax_t freq;
  55                 size_t size;
  56
  57                 mib[0] = CTL_HW;
  58                 mib[1] = HW_CPUSPEED;
  59
  60                 size = sizeof(freq);
  61
  62                 /* in MHz */
  63                 if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
  64                         warn("sysctl 'HW_CPUSPEED':");
  65                         return NULL;
  66                 }
  67
  68                 return fmt_human(freq * 1E6, 1000);
  69         }
  70
  71         const char *
  72         cpu_perc(void)
  73         {
  74                 int mib[2];
  75                 static uintmax_t a[CPUSTATES];
  76                 uintmax_t b[CPUSTATES];
  77                 size_t size;
  78
  79                 mib[0] = CTL_KERN;
  80                 mib[1] = KERN_CPTIME;
  81
  82                 size = sizeof(a);
  83
  84                 memcpy(b, a, sizeof(b));
  85                 if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
  86                         warn("sysctl 'KERN_CPTIME':");
  87                         return NULL;
  88                 }
  89                 if (b[0] == 0) {
  90                         return NULL;
  91                 }
  92
  93                 return bprintf("%d", 100 *
  94                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR]) -
  95                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR])) /
  96                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] +
  97                                  a[CP_IDLE]) -
  98                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] +
  99                                  b[CP_IDLE])));
 100         }
 101 #endif