使用c++解析/proc/stat

#include <iostream>
#include <fstream>
#include <sstream>
#include <vector>
#include <string>

struct CPUStat {
    std::string name;
    long user, nice, system, idle, iowait, irq, softirq, steal, guest, guest_nice;
};

std::vector<CPUStat> parseProcStat() {
    std::ifstream file("/proc/stat");
    std::string line;
    std::vector<CPUStat> stats;

    if (file.is_open()) {
        while (getline(file, line)) {
            if (line.empty() || line[0] == 'c') continue; // Skip header and invalid lines

            std::istringstream iss(line);
            CPUStat stat;
            iss >> stat.name;

            if (stat.name == "cpu") {
                iss >> stat.user >> stat.nice >> stat.system >> stat.idle >> stat.iowait >> stat.irq >> stat.softirq >> stat.steal >> stat.guest >> stat.guest_nice;
            } else if (stat.name.substr(0, 3) == "cpu") {
                stat.name = stat.name.substr(3); // Remove "cpu" prefix for individual cores
                iss >> stat.user >> stat.nice >> stat.system >> stat.idle >> stat.iowait >> stat.irq >> stat.softirq >> stat.steal >> stat.guest >> stat.guest_nice;
            } else {
                continue; // Skip other non-CPU related lines
            }

            stats.push_back(stat);
        }
        file.close();
    }

    return stats;
}

int main() {
    auto stats = parseProcStat();

    for (const auto& stat : stats) {
        std::cout << "CPU " << stat.name << ": "
                  << "user=" << stat.user << ", "
                  << "system=" << stat.system << ", "
                  << "idle=" << stat.idle << std::endl;
    }

    return 0;
}