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// vim:ts=4:sw=4: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>
#if defined(__OpenBSD__)
#include <sys/sched.h>
#else
#include <sys/dkstat.h>
#endif
#endif
#if defined(__DragonFly__)
#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/resource.h>
#endif
#if defined(__NetBSD__)
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <sys/sched.h>
#endif
#include "i3status.h"
struct cpu_usage {
int user;
int nice;
int system;
int idle;
int total;
};
static int cpu_count = 0;
static struct cpu_usage prev_all = {0, 0, 0, 0, 0};
static struct cpu_usage *prev_cpus = NULL;
static struct cpu_usage *curr_cpus = NULL;
/*
* 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 *format_above_threshold, const char *format_above_degraded_threshold, const char *path, const float max_threshold, const float degraded_threshold) {
const char *selected_format = format;
const char *walk;
char *outwalk = buffer;
struct cpu_usage curr_all = {0, 0, 0, 0, 0};
int diff_idle, diff_total, diff_usage;
bool colorful_output = false;
#if defined(LINUX)
// Detecting if CPU count has changed
int curr_cpu_count = sysconf(_SC_NPROCESSORS_ONLN);
if (curr_cpu_count != cpu_count) {
cpu_count = curr_cpu_count;
free(prev_cpus);
prev_cpus = (struct cpu_usage *)calloc(cpu_count, sizeof(struct cpu_usage));
free(curr_cpus);
curr_cpus = (struct cpu_usage *)calloc(cpu_count, sizeof(struct cpu_usage));
}
char buf[4096];
if (!slurp(path, buf, sizeof(buf)))
goto error;
// Parsing all cpu values using strtok
if (strtok(buf, "\n") == NULL)
goto error;
char *buf_itr = NULL;
for (int cpu_idx = 0; cpu_idx < cpu_count; cpu_idx++) {
buf_itr = strtok(NULL, "\n");
int curr_cpu_idx = -1;
if (!buf_itr || sscanf(buf_itr, "cpu%d %d %d %d %d", &curr_cpu_idx, &curr_cpus[cpu_idx].user, &curr_cpus[cpu_idx].nice, &curr_cpus[cpu_idx].system, &curr_cpus[cpu_idx].idle) != 5 || curr_cpu_idx != cpu_idx)
goto error;
curr_cpus[cpu_idx].total = curr_cpus[cpu_idx].user + curr_cpus[cpu_idx].nice + curr_cpus[cpu_idx].system + curr_cpus[cpu_idx].idle;
curr_all.user += curr_cpus[cpu_idx].user;
curr_all.nice += curr_cpus[cpu_idx].nice;
curr_all.system += curr_cpus[cpu_idx].system;
curr_all.idle += curr_cpus[cpu_idx].idle;
curr_all.total += curr_cpus[cpu_idx].total;
}
diff_idle = curr_all.idle - prev_all.idle;
diff_total = curr_all.total - prev_all.total;
diff_usage = (diff_total ? (1000 * (diff_total - diff_idle) / diff_total + 5) / 10 : 0);
prev_all = curr_all;
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__)
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_all.user = cp_time[CP_USER];
curr_all.nice = cp_time[CP_NICE];
curr_all.system = cp_time[CP_SYS];
curr_all.idle = cp_time[CP_IDLE];
curr_all.total = curr_all.user + curr_all.nice + curr_all.system + curr_all.idle;
diff_idle = curr_all.idle - prev_all.idle;
diff_total = curr_all.total - prev_all.total;
diff_usage = (diff_total ? (1000 * (diff_total - diff_idle) / diff_total + 5) / 10 : 0);
prev_all = curr_all;
#else
goto error;
#endif
if (diff_usage >= max_threshold) {
START_COLOR("color_bad");
colorful_output = true;
if (format_above_threshold != NULL)
selected_format = format_above_threshold;
} else if (diff_usage >= degraded_threshold) {
START_COLOR("color_degraded");
colorful_output = true;
if (format_above_degraded_threshold != NULL)
selected_format = format_above_degraded_threshold;
}
for (walk = selected_format; *walk != '\0'; walk++) {
if (*walk != '%') {
*(outwalk++) = *walk;
} else if (BEGINS_WITH(walk + 1, "usage")) {
outwalk += sprintf(outwalk, "%02d%s", diff_usage, pct_mark);
walk += strlen("usage");
}
#if defined(LINUX)
else if (BEGINS_WITH(walk + 1, "cpu")) {
int number = -1;
sscanf(walk + 1, "cpu%d", &number);
if (number < 0 || number >= cpu_count) {
fprintf(stderr, "provided CPU number '%d' above detected number of CPU %d\n", number, cpu_count);
} else {
int cpu_diff_idle = curr_cpus[number].idle - prev_cpus[number].idle;
int cpu_diff_total = curr_cpus[number].total - prev_cpus[number].total;
int cpu_diff_usage = (cpu_diff_total ? (1000 * (cpu_diff_total - cpu_diff_idle) / cpu_diff_total + 5) / 10 : 0);
outwalk += sprintf(outwalk, "%02d%s", cpu_diff_usage, pct_mark);
}
int padding = 1;
int step = 10;
while (step <= number) {
step *= 10;
padding++;
}
walk += strlen("cpu") + padding;
}
#endif
else {
*(outwalk++) = '%';
}
}
for (int i = 0; i < cpu_count; i++)
prev_cpus[i] = curr_cpus[i];
if (colorful_output)
END_COLOR;
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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