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 int valid;
  30                 static long double a[7];
  31                 long double b[7];
  32
  33                 memcpy(b, a, sizeof(b));
  34                 /* cpu user nice system idle iowait irq softirq */
  35                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  36                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
  37                         return NULL;
  38                 }
  39                 if (!valid) {
  40                         valid = 1;
  41                         return NULL;
  42                 }
  43
  44                 return bprintf("%d%%", (int)(100 *
  45                                ((b[0] + b[1] + b[2] + b[5] + b[6]) -
  46                                 (a[0] + a[1] + a[2] + a[5] + a[6])) /
  47                                ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
  48                                 (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]))));
  49         }
  50 #elif defined(__OpenBSD__)
  51         #include <sys/param.h>
  52         #include <sys/sched.h>
  53         #include <sys/sysctl.h>
  54
  55         const char *
  56         cpu_freq(void)
  57         {
  58                 int freq, mib[2];
  59                 size_t size;
  60
  61                 mib[0] = CTL_HW;
  62                 mib[1] = HW_CPUSPEED;
  63
  64                 size = sizeof(freq);
  65
  66                 /* in MHz */
  67                 if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
  68                         warn("sysctl 'HW_CPUSPEED':");
  69                         return NULL;
  70                 }
  71
  72                 return fmt_human_10((size_t)freq * 1000 * 1000, "Hz");
  73         }
  74
  75         const char *
  76         cpu_perc(void)
  77         {
  78                 int mib[2];
  79                 static int valid;
  80                 static long int a[CPUSTATES];
  81                 long int b[CPUSTATES];
  82                 size_t size;
  83
  84                 mib[0] = CTL_KERN;
  85                 mib[1] = KERN_CPTIME;
  86
  87                 size = sizeof(a);
  88
  89                 memcpy(b, a, sizeof(b));
  90                 if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
  91                         warn("sysctl 'KERN_CPTIME':");
  92                         return NULL;
  93                 }
  94                 if (!valid) {
  95                         valid = 1;
  96                         return NULL;
  97                 }
  98
  99                 return bprintf("%d%%", 100 *
 100                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR]) -
 101                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR])) /
 102                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] +
 103                                  a[CP_IDLE]) -
 104                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] +
 105                                  b[CP_IDLE])));
 106         }
 107 #endif