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 #if defined(__linux__)
   8         #include <inttypes.h>
   9         #include <stdint.h>
  10
  11         const char *
  12         cpu_freq(void)
  13         {
  14                 uint64_t freq;
  15
  16                 /* in kHz */
  17                 if (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
  18                             "%"SCNu64, &freq) != 1) {
  19                         return NULL;
  20                 }
  21
  22                 return fmt_human(freq * 1000, 1000);
  23         }
  24
  25         const char *
  26         cpu_perc(void)
  27         {
  28                 static long double a[7];
  29                 long double b[7];
  30
  31                 memcpy(b, a, sizeof(b));
  32                 /* cpu user nice system idle iowait irq softirq */
  33                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  34                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
  35                         return NULL;
  36                 }
  37                 if (b[0] == 0) {
  38                         return NULL;
  39                 }
  40
  41                 return bprintf("%d", (int)(100 *
  42                                ((b[0] + b[1] + b[2] + b[5] + b[6]) -
  43                                 (a[0] + a[1] + a[2] + a[5] + a[6])) /
  44                                ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
  45                                 (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]))));
  46         }
  47 #elif defined(__OpenBSD__)
  48         #include <sys/param.h>
  49         #include <sys/sched.h>
  50         #include <sys/sysctl.h>
  51
  52         const char *
  53         cpu_freq(void)
  54         {
  55                 int freq, mib[2];
  56                 size_t size;
  57
  58                 mib[0] = CTL_HW;
  59                 mib[1] = HW_CPUSPEED;
  60
  61                 size = sizeof(freq);
  62
  63                 /* in MHz */
  64                 if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
  65                         warn("sysctl 'HW_CPUSPEED':");
  66                         return NULL;
  67                 }
  68
  69                 return fmt_human((size_t)freq * 1000 * 1000, 1000);
  70         }
  71
  72         const char *
  73         cpu_perc(void)
  74         {
  75                 int mib[2];
  76                 static long int a[CPUSTATES];
  77                 long int b[CPUSTATES];
  78                 size_t size;
  79
  80                 mib[0] = CTL_KERN;
  81                 mib[1] = KERN_CPTIME;
  82
  83                 size = sizeof(a);
  84
  85                 memcpy(b, a, sizeof(b));
  86                 if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
  87                         warn("sysctl 'KERN_CPTIME':");
  88                         return NULL;
  89                 }
  90                 if (b[0] == 0) {
  91                         return NULL;
  92                 }
  93
  94                 return bprintf("%d", 100 *
  95                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR]) -
  96                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR])) /
  97                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] +
  98                                  a[CP_IDLE]) -
  99                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] +
 100                                  b[CP_IDLE])));
 101         }
 102 #endif