components/cpu.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdint.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                 uintmax_t freq;
  13
  14                 /* in kHz */
  15                 if (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/"
  16                            "scaling_cur_freq", "%ju", &freq) != 1) {
  17                         return NULL;
  18                 }
  19
  20                 return fmt_human(freq * 1000, 1000);
  21         }
  22
  23         const char *
  24         cpu_perc(void)
  25         {
  26                 static long double a[7];
  27                 long double b[7];
  28
  29                 memcpy(b, a, sizeof(b));
  30                 /* cpu user nice system idle iowait irq softirq */
  31                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  32                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6])
  33                     != 7) {
  34                         return NULL;
  35                 }
  36                 if (b[0] == 0) {
  37                         return NULL;
  38                 }
  39
  40                 return bprintf("%d", (int)(100 *
  41                                ((b[0] + b[1] + b[2] + b[5] + b[6]) -
  42                                 (a[0] + a[1] + a[2] + a[5] + a[6])) /
  43                                ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] +
  44                                  b[6]) -
  45                                 (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] +
  46                                  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(freq * 1E6, 1000);
  71         }
  72
  73         const char *
  74         cpu_perc(void)
  75         {
  76                 int mib[2];
  77                 static uintmax_t a[CPUSTATES];
  78                 uintmax_t 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] +
  97                                  a[CP_INTR]) -
  98                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
  99                                  b[CP_INTR])) /
 100                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
 101                                  a[CP_INTR] + a[CP_IDLE]) -
 102                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
 103                                  b[CP_INTR] + b[CP_IDLE])));
 104         }
 105 #elif defined(__FreeBSD__)
 106         #include <sys/param.h>
 107         #include <sys/sysctl.h>
 108         #include <devstat.h>
 109
 110         const char *
 111         cpu_freq(void)
 112         {
 113                 int freq;
 114                 size_t size;
 115
 116                 size = sizeof(freq);
 117                 /* in MHz */
 118                 if (sysctlbyname("hw.clockrate", &freq, &size, NULL, 0) == -1
 119                                 || !size) {
 120                         warn("sysctlbyname 'hw.clockrate':");
 121                         return NULL;
 122                 }
 123
 124                 return fmt_human(freq * 1E6, 1000);
 125         }
 126
 127         const char *
 128         cpu_perc(void)
 129         {
 130                 size_t size;
 131                 static long a[CPUSTATES];
 132                 long b[CPUSTATES];
 133
 134                 size = sizeof(a);
 135                 memcpy(b, a, sizeof(b));
 136                 if (sysctlbyname("kern.cp_time", &a, &size, NULL, 0) == -1
 137                                 || !size) {
 138                         warn("sysctlbyname 'kern.cp_time':");
 139                         return NULL;
 140                 }
 141                 if (b[0] == 0) {
 142                         return NULL;
 143                 }
 144
 145                 return bprintf("%d", 100 *
 146                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
 147                                  a[CP_INTR]) -
 148                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
 149                                  b[CP_INTR])) /
 150                                ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] +
 151                                  a[CP_INTR] + a[CP_IDLE]) -
 152                                 (b[CP_USER] + b[CP_NICE] + b[CP_SYS] +
 153                                  b[CP_INTR] + b[CP_IDLE])));
 154         }
 155 #endif