components/cpu.c
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/* See LICENSE file for copyright and license details. */
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "../util.h"
#if defined(__linux__)
const char *
cpu_freq(void)
{
uintmax_t freq;
/* in kHz */
if (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/"
"scaling_cur_freq", "%ju", &freq) != 1) {
return NULL;
}
return fmt_human(freq * 1000, 1000);
}
const char *
cpu_perc(void)
{
static long double a[7];
long double b[7], sum;
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 (b[0] == 0) {
return NULL;
}
sum = (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]);
if (sum == 0) {
return NULL;
}
return bprintf("%d", (int)(100 *
((b[0] + b[1] + b[2] + b[5] + b[6]) -
(a[0] + a[1] + a[2] + a[5] + a[6])) / sum));
}
#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);
/* in MHz */
if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
warn("sysctl 'HW_CPUSPEED':");
return NULL;
}
return fmt_human(freq * 1E6, 1000);
}
const char *
cpu_perc(void)
{
int mib[2];
static uintmax_t a[CPUSTATES];
uintmax_t b[CPUSTATES], sum;
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) < 0) {
warn("sysctl 'KERN_CPTIME':");
return NULL;
}
if (b[0] == 0) {
return NULL;
}
sum = (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]);
if (sum == 0) {
return NULL;
}
return bprintf("%d", 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])) / sum);
}
#elif defined(__FreeBSD__)
#include <sys/param.h>
#include <sys/sysctl.h>
#include <devstat.h>
const char *
cpu_freq(void)
{
int freq;
size_t size;
size = sizeof(freq);
/* in MHz */
if (sysctlbyname("hw.clockrate", &freq, &size, NULL, 0) == -1
|| !size) {
warn("sysctlbyname 'hw.clockrate':");
return NULL;
}
return fmt_human(freq * 1E6, 1000);
}
const char *
cpu_perc(void)
{
size_t size;
static long a[CPUSTATES];
long b[CPUSTATES], sum;
size = sizeof(a);
memcpy(b, a, sizeof(b));
if (sysctlbyname("kern.cp_time", &a, &size, NULL, 0) == -1
|| !size) {
warn("sysctlbyname 'kern.cp_time':");
return NULL;
}
if (b[0] == 0) {
return NULL;
}
sum = (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]);
if (sum == 0) {
return NULL;
}
return bprintf("%d", 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])) / sum);
}
#endif