1 // vim:sw=8:sts=8:ts=8:expandtab
9 #include <sys/sysctl.h>
10 #include <sys/dkstat.h>
15 static int prev_total = 0;
16 static int prev_idle = 0;
19 * Reads the CPU utilization from /proc/stat and returns the usage as a
23 void print_cpu_usage(const char *format) {
26 int curr_user, curr_nice, curr_system, curr_idle, curr_total;
27 int diff_idle, diff_total, diff_usage;
30 static char statpath[512];
31 strcpy(statpath, "/proc/stat");
32 if (!slurp(statpath, buf, sizeof(buf)))
33 die("could not read %s\n", statpath);
35 if (sscanf(buf, "cpu %d %d %d %d", &curr_user, &curr_nice, &curr_system, &curr_idle) != 4)
36 die("could not read cpu utilization\n");
38 curr_total = curr_user + curr_nice + curr_system + curr_idle;
39 diff_idle = curr_idle - prev_idle;
40 diff_total = curr_total - prev_total;
41 diff_usage = (1000 * (diff_total - diff_idle)/diff_total + 5)/10;
42 prev_total = curr_total;
43 prev_idle = curr_idle;
45 #if defined(__FreeBSD__)
47 long cp_time[CPUSTATES];
48 size = sizeof cp_time;
49 if (sysctlbyname("kern.cp_time", &cp_time, &size, NULL, 0) < 0){
52 curr_user = cp_time[CP_USER];
53 curr_nice = cp_time[CP_NICE];
54 curr_system = cp_time[CP_SYS];
55 curr_idle = cp_time[CP_IDLE];
56 curr_total = curr_user + curr_nice + curr_system + curr_idle;
57 diff_idle = curr_idle - prev_idle;
58 diff_total = curr_total - prev_total;
59 diff_usage = (1000 * (diff_total - diff_idle)/diff_total + 5)/10;
60 prev_total = curr_total;
61 prev_idle = curr_idle;
64 for (walk = format; *walk != '\0'; walk++) {
70 if (strncmp(walk+1, "usage", strlen("usage")) == 0) {
71 printf("%02d%%", diff_usage);
72 walk += strlen("usage");