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get_proc_data.cpp

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

struct Proc {
    int pid;
    int ppid;
    double memory;
    double cpu;
    int threads;
    std::string name;
};

int main() {
    // Create Map
    std::map<int, std::vector<Proc>> processes;

    // Create file with all data about process
    system("ps xao pid,ppid,pmem,pcpu,thcount,comm > proc_list.dat");

    // Open file
    std::ifstream file("proc_list.dat");
    if (!file.is_open()) {
        exit(1);
    }

    // Just a variable to keep the line content
    std::string line;

    // Ignore first line with header info
    std::getline(file, line);

    // Read all lines from file
    while (std::getline(file, line)) {
        Proc a;
        std::stringstream ss(line);

        ss >> a.pid >> a.ppid >> a.memory >> a.cpu >> a.threads;
        if (ss >> a.name) {
            processes[a.ppid].push_back(a);
        }
    }

    // Close file and delete him
    file.close();
    system("rm proc_list.dat");

    return 0;
}