ARK-OS/arkos/system/modules/ark/sys/cpu.c

#include "cpu.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int ark_sys_cpu_get_usage(void) {
    FILE *fp = fopen("/proc/stat", "r");
    if (!fp) return 0;
    
    char line[256];
    if (!fgets(line, sizeof(line), fp)) {
        fclose(fp);
        return 0;
    }
    fclose(fp);
    
    uint64_t user = 0, nice = 0, system = 0, idle = 0;
    if (sscanf(line, "cpu %lu %lu %lu %lu", &user, &nice, &system, &idle) < 4) {
        return 0;
    }
    
    uint64_t total = user + nice + system + idle;
    if (total == 0) return 0;
    
    int usage = (total - idle) * 100 / total;
    if (usage < 0) usage = 0;
    if (usage > 100) usage = 100;
    return usage;
}