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// vim:sw=8:sts=8:ts=8:expandtab
#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <yajl/yajl_gen.h>
#include <yajl/yajl_version.h>
#if defined(__FreeBSD__) || defined(__OpenBSD__)
#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/dkstat.h>
#endif
#include "i3status.h"
static int prev_total = 0;
static int prev_idle = 0;
/*
* Reads the CPU utilization from /proc/stat and returns the usage as a
* percentage.
*
*/
void print_cpu_usage(yajl_gen json_gen, char *buffer, const char *format) {
const char *walk;
char *outwalk = buffer;
char buf[1024];
int curr_user = 0, curr_nice = 0, curr_system = 0, curr_idle = 0, curr_total;
int diff_idle, diff_total, diff_usage;
#if defined(LINUX)
static char statpath[512];
strcpy(statpath, "/proc/stat");
if (!slurp(statpath, buf, sizeof(buf)) ||
sscanf(buf, "cpu %d %d %d %d", &curr_user, &curr_nice, &curr_system, &curr_idle) != 4)
goto error;
curr_total = curr_user + curr_nice + curr_system + curr_idle;
diff_idle = curr_idle - prev_idle;
diff_total = curr_total - prev_total;
diff_usage = (diff_total ? (1000 * (diff_total - diff_idle)/diff_total + 5)/10 : 0);
prev_total = curr_total;
prev_idle = curr_idle;
#elif defined(__FreeBSD__) || defined(__OpenBSD__)
#if defined(__FreeBSD__)
size_t size;
long cp_time[CPUSTATES];
size = sizeof cp_time;
if (sysctlbyname("kern.cp_time", &cp_time, &size, NULL, 0) < 0)
goto error;
#else
/* This information is taken from the boot cpu, any other cpus are currently ignored. */
long cp_time[CPUSTATES];
int mib[2];
size_t size = sizeof(cp_time);
mib[0] = CTL_KERN;
mib[1] = KERN_CPTIME;
if (sysctl(mib, 2, cp_time, &size, NULL, 0))
goto error;
#endif
curr_user = cp_time[CP_USER];
curr_nice = cp_time[CP_NICE];
curr_system = cp_time[CP_SYS];
curr_idle = cp_time[CP_IDLE];
curr_total = curr_user + curr_nice + curr_system + curr_idle;
diff_idle = curr_idle - prev_idle;
diff_total = curr_total - prev_total;
diff_usage = (diff_total ? (1000 * (diff_total - diff_idle)/diff_total + 5)/10 : 0);
prev_total = curr_total;
prev_idle = curr_idle;
#else
goto error;
#endif
for (walk = format; *walk != '\0'; walk++) {
if (*walk != '%') {
*(outwalk++) = *walk;
continue;
}
if (strncmp(walk+1, "usage", strlen("usage")) == 0) {
outwalk += sprintf(outwalk, "%02d%%", diff_usage);
walk += strlen("usage");
}
}
OUTPUT_FULL_TEXT(buffer);
return;
error:
OUTPUT_FULL_TEXT("cant read cpu usage");
(void)fputs("i3status: Cannot read CPU usage\n", stderr);
}
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