components/cpu.c
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/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "../util.h"
#if defined(__linux__)
const char *
cpu_freq(void)
{
int freq;
return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
"%i", &freq) == 1) ?
bprintf("%d", (freq + 500) / 1000) : NULL;
}
const char *
cpu_perc(void)
{
int perc;
static long double a[7];
static int valid;
long double b[7];
memcpy(b, a, sizeof(b));
/* cpu user nice system idle iowait irq softirq */
if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
&a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
return NULL;
}
if (!valid) {
valid = 1;
return NULL;
}
perc = 100 * ((b[0] + b[1] + b[2] + b[5] + b[6]) -
(a[0] + a[1] + a[2] + a[5] + a[6])) /
((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
(a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]));
return bprintf("%d", perc);
}
#elif defined(__OpenBSD__)
#include <sys/param.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
const char *
cpu_freq(void)
{
int freq, mib[2];
size_t size;
mib[0] = CTL_HW;
mib[1] = HW_CPUSPEED;
size = sizeof(freq);
if (sysctl(mib, 2, &freq, &size, NULL, 0) == -1) {
fprintf(stderr, "sysctl 'HW_CPUSPEED': %s\n",
strerror(errno));
return NULL;
}
return bprintf("%d", freq);
}
const char *
cpu_perc(void)
{
int mib[2], perc;
static int valid;
static long int a[CPUSTATES];
long int b[CPUSTATES];
size_t size;
mib[0] = CTL_KERN;
mib[1] = KERN_CPTIME;
size = sizeof(a);
memcpy(b, a, sizeof(b));
if (sysctl(mib, 2, &a, &size, NULL, 0) == -1) {
fprintf(stderr, "sysctl 'KERN_CPTIME': %s\n", strerror(errno));
return NULL;
}
if (!valid) {
valid = 1;
return NULL;
}
perc = 100 *
((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR]) -
(b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR])) /
((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] + a[CP_IDLE]) -
(b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] + b[CP_IDLE]));
return bprintf("%d", perc);
}
#endif