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         const char *
  10         cpu_freq(void)
  11         {
  12                 int freq;
  13
  14                 return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
  15                                "%d", &freq) == 1) ?
  16                        bprintf("%d", (freq + 500) / 1000) : NULL;
  17         }
  18
  19         const char *
  20         cpu_perc(void)
  21         {
  22                 static int valid;
  23                 static long double a[7];
  24                 long double b[7];
  25
  26                 memcpy(b, a, sizeof(b));
  27                 /* cpu user nice system idle iowait irq softirq */
  28                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  29                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
  30                         return NULL;
  31                 }
  32                 if (!valid) {
  33                         valid = 1;
  34                         return NULL;
  35                 }
  36
  37                 return bprintf("%d%%", (int)(100 *
  38                                ((b[0] + b[1] + b[2] + b[5] + b[6]) -
  39                                 (a[0] + a[1] + a[2] + a[5] + a[6])) /
  40                                ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
  41                                 (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]))));
  42         }
  43 #elif defined(__OpenBSD__)
  44         #include <sys/param.h>
  45         #include <sys/sched.h>
  46         #include <sys/sysctl.h>
  47
  48         const char *
  49         cpu_freq(void)
  50         {
  51                 int freq, mib[2];
  52                 size_t size;
  53
  54                 mib[0] = CTL_HW;
  55                 mib[1] = HW_CPUSPEED;
  56
  57                 size = sizeof(freq);
  58
  59                 if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
  60                         warn("sysctl 'HW_CPUSPEED':");
  61                         return NULL;
  62                 }
  63
  64                 return bprintf("%d", freq);
  65         }
  66
  67         const char *
  68         cpu_perc(void)
  69         {
  70                 int mib[2];
  71                 static int valid;
  72                 static long int a[CPUSTATES];
  73                 long int b[CPUSTATES];
  74                 size_t size;
  75
  76                 mib[0] = CTL_KERN;
  77                 mib[1] = KERN_CPTIME;
  78
  79                 size = sizeof(a);
  80
  81                 memcpy(b, a, sizeof(b));
  82                 if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
  83                         warn("sysctl 'KERN_CPTIME':");
  84                         return NULL;
  85                 }
  86                 if (!valid) {
  87                         valid = 1;
  88                         return NULL;
  89                 }
  90
  91                 return bprintf("%d%%", 100 *
  92                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR]) -
  93                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR])) /
  94                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] +
  95                                  a[CP_IDLE]) -
  96                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] +
  97                                  b[CP_IDLE])));
  98         }
  99 #endif