/*

* Copyright (c) 2016 Catalysts GmbH

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

#include <fstream>

#include <sstream>

#include "common.h"

#include "vendor/tinyformat.hpp"

namespace ebpf {

std::vector<int> read_cpu_range(std::string path) {

std::ifstream cpus_range_stream { path };

std::vector<int> cpus;

std::string cpu_range;

while (std::getline(cpus_range_stream, cpu_range, ',')) {

std::size_t rangeop = cpu_range.find('-');

if (rangeop == std::string::npos) {

cpus.push_back(std::stoi(cpu_range));

}

else {

int start = std::stoi(cpu_range.substr(0, rangeop));

int end = std::stoi(cpu_range.substr(rangeop + 1));

for (int i = start; i <= end; i++)

cpus.push_back(i);

}

}

return cpus;

}

std::vector<int> get_online_cpus() {

return read_cpu_range("/sys/devices/system/cpu/online");

}

std::vector<int> get_possible_cpus() {

return read_cpu_range("/sys/devices/system/cpu/possible");

}

std::string get_pid_exe(pid_t pid) {

char exe_path[4096];

int res;

std::string exe_link = tfm::format("/proc/%d/exe", pid);

res = readlink(exe_link.c_str(), exe_path, sizeof(exe_path));

if (res == -1)

return "";

if (res >= sizeof(exe_path))

res = sizeof(exe_path) - 1;

exe_path[res] = '\0';

return std::string(exe_path);

}

} // namespace ebpf