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// vim:sw=8:sts=8:ts=8:expandtab
#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#ifdef __FreeBSD__
#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(const char *format) {
const char *walk;
char buf[1024];
int curr_user, curr_nice, curr_system, curr_idle, 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 = (1000 * (diff_total - diff_idle)/diff_total + 5)/10;
prev_total = curr_total;
prev_idle = curr_idle;
#elif 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;
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 = (1000 * (diff_total - diff_idle)/diff_total + 5)/10;
prev_total = curr_total;
prev_idle = curr_idle;
#else
goto error;
#endif
for (walk = format; *walk != '\0'; walk++) {
if (*walk != '%') {
putchar(*walk);
continue;
}
if (strncmp(walk+1, "usage", strlen("usage")) == 0) {
printf("%02d%%", diff_usage);
walk += strlen("usage");
}
}
return;
error:
(void)fputs("Cannot read usage\n", stderr);
}
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