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                 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                 perc = 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                 return bprintf("%d", perc);
  44         }
  45
  46         const char *
  47         cpu_iowait(void)
  48         {
  49                 int perc;
  50                 static int valid;
  51                 static long double a[7];
  52                 long double b[7];
  53
  54                 memcpy(b, a, sizeof(b));
  55                 if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
  56                            &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
  57                         return NULL;
  58                 }
  59                 if (!valid) {
  60                         valid = 1;
  61                         return NULL;
  62                 }
  63
  64                 perc = 100 * ((b[4]) - (a[4])) /
  65                        ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) -
  66                         (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
  67
  68                 return bprintf("%d", perc);
  69         }
  70 #elif defined(__OpenBSD__)
  71         #include <sys/param.h>
  72         #include <sys/sched.h>
  73         #include <sys/sysctl.h>
  74
  75         const char *
  76         cpu_freq(void)
  77         {
  78                 int freq, mib[2];
  79                 size_t size;
  80
  81                 mib[0] = CTL_HW;
  82                 mib[1] = HW_CPUSPEED;
  83
  84                 size = sizeof(freq);
  85
  86                 if (sysctl(mib, 2, &freq, &size, NULL, 0) == -1) {
  87                         fprintf(stderr, "sysctl 'HW_CPUSPEED': %s\n",
  88                                 strerror(errno));
  89                         return NULL;
  90                 }
  91
  92                 return bprintf("%d", freq);
  93         }
  94
  95         const char *
  96         cpu_perc(void)
  97         {
  98                 int mib[2], perc;
  99                 static int valid;
 100                 static long int a[CPUSTATES];
 101                 long int b[CPUSTATES];
 102                 size_t size;
 103
 104                 mib[0] = CTL_KERN;
 105                 mib[1] = KERN_CPTIME;
 106
 107                 size = sizeof(a);
 108
 109                 memcpy(b, a, sizeof(b));
 110                 if (sysctl(mib, 2, &a, &size, NULL, 0) == -1) {
 111                         fprintf(stderr, "sysctl 'KERN_CPTIME': %s\n", strerror(errno));
 112                         return NULL;
 113                 }
 114                 if (!valid) {
 115                         valid = 1;
 116                         return NULL;
 117                 }
 118
 119                 perc = 100 *
 120                        ((a[CP_USER]+a[CP_NICE]+a[CP_SYS]+a[CP_INTR]) -
 121                         (b[CP_USER]+b[CP_NICE]+b[CP_SYS]+b[CP_INTR])) /
 122                        ((a[CP_USER]+a[CP_NICE]+a[CP_SYS]+a[CP_INTR]+a[CP_IDLE]) -
 123                         (b[CP_USER]+b[CP_NICE]+b[CP_SYS]+b[CP_INTR]+b[CP_IDLE]));
 124
 125                 return bprintf("%d", perc);
 126         }
 127 #endif