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
   6 #include "../util.h"
   7
   8 #if defined(__linux__)
   9         #include <inttypes.h>
  10         #include <stdint.h>
  11
  12         const char *
  13         cpu_freq(void)
  14         {
  15                 uint64_t freq;
  16
  17                 /* in kHz */
  18                 if (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
  19                             "%"SCNu64, &freq) != 1) {
  20                         return NULL;
  21                 }
  22
  23                 return fmt_human_10(freq * 1000, "Hz");
  24         }
  25
  26         const char *
  27         cpu_perc(void)
  28         {
  29                 static long double a[7];
  30                 long double b[7];
  31
  32                 memcpy(b, a, sizeof(b));
  33                 /* cpu user nice system idle iowait irq softirq */
  34                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  35                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
  36                         return NULL;
  37                 }
  38                 if (b[0] == 0) {
  39                         return NULL;
  40                 }
  41
  42                 return bprintf("%d%%", (int)(100 *
  43                                ((b[0] + b[1] + b[2] + b[5] + b[6]) -
  44                                 (a[0] + a[1] + a[2] + a[5] + a[6])) /
  45                                ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
  46                                 (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]))));
  47         }
  48 #elif defined(__OpenBSD__)
  49         #include <sys/param.h>
  50         #include <sys/sched.h>
  51         #include <sys/sysctl.h>
  52
  53         const char *
  54         cpu_freq(void)
  55         {
  56                 int freq, mib[2];
  57                 size_t size;
  58
  59                 mib[0] = CTL_HW;
  60                 mib[1] = HW_CPUSPEED;
  61
  62                 size = sizeof(freq);
  63
  64                 /* in MHz */
  65                 if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
  66                         warn("sysctl 'HW_CPUSPEED':");
  67                         return NULL;
  68                 }
  69
  70                 return fmt_human_10((size_t)freq * 1000 * 1000, "Hz");
  71         }
  72
  73         const char *
  74         cpu_perc(void)
  75         {
  76                 int mib[2];
  77                 static long int a[CPUSTATES];
  78                 long int b[CPUSTATES];
  79                 size_t size;
  80
  81                 mib[0] = CTL_KERN;
  82                 mib[1] = KERN_CPTIME;
  83
  84                 size = sizeof(a);
  85
  86                 memcpy(b, a, sizeof(b));
  87                 if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
  88                         warn("sysctl 'KERN_CPTIME':");
  89                         return NULL;
  90                 }
  91                 if (b[0] == 0) {
  92                         return NULL;
  93                 }
  94
  95                 return bprintf("%d%%", 100 *
  96                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR]) -
  97                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR])) /
  98                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] +
  99                                  a[CP_IDLE]) -
 100                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] +
 101                                  b[CP_IDLE])));
 102         }
 103 #endif