1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
// vim:sw=8:sts=8:ts=8:expandtab
#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#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)))
die("could not read %s\n", statpath);
if (sscanf(buf, "cpu %d %d %d %d", &curr_user, &curr_nice, &curr_system, &curr_idle) != 4)
die("could not read cpu utilization\n");
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;
#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");
}
}
}
|
