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                                "%i", &freq) == 1) ?
  16                        bprintf("%d", (freq + 500) / 1000) : NULL;
  17         }
  18
  19         const char *
  20         cpu_perc(void)
  21         {
  22                 int perc;
  23                 static long double a[7];
  24                 static int valid;
  25                 long double b[7];
  26
  27                 memcpy(b, a, sizeof(b));
  28                 /* cpu user nice system idle iowait irq softirq */
  29                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  30                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
  31                         return NULL;
  32                 }
  33                 if (!valid) {
  34                         valid = 1;
  35                         return NULL;
  36                 }
  37
  38                 perc = 100 * ((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                 return bprintf("%d", perc);
  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 freq, mib[2];
  54                 size_t size;
  55
  56                 mib[0] = CTL_HW;
  57                 mib[1] = HW_CPUSPEED;
  58
  59                 size = sizeof(freq);
  60
  61                 if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
  62                         fprintf(stderr, "sysctl 'HW_CPUSPEED': %s\n", strerror(errno));
  63                         return NULL;
  64                 }
  65
  66                 return bprintf("%d", freq);
  67         }
  68
  69         const char *
  70         cpu_perc(void)
  71         {
  72                 int mib[2], perc;
  73                 static int valid;
  74                 static long int a[CPUSTATES];
  75                 long int b[CPUSTATES];
  76                 size_t size;
  77
  78                 mib[0] = CTL_KERN;
  79                 mib[1] = KERN_CPTIME;
  80
  81                 size = sizeof(a);
  82
  83                 memcpy(b, a, sizeof(b));
  84                 if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
  85                         fprintf(stderr, "sysctl 'KERN_CPTIME': %s\n", strerror(errno));
  86                         return NULL;
  87                 }
  88                 if (!valid) {
  89                         valid = 1;
  90                         return NULL;
  91                 }
  92
  93                 perc = 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] + a[CP_IDLE]) -
  97                        (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] + b[CP_IDLE]));
  98
  99                 return bprintf("%d", perc);
 100         }
 101 #endif