/*
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* Copyright (c) 2016 Catalysts GmbH
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <fstream>
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#include <sstream>
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#include "common.h"
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#include "vendor/tinyformat.hpp"
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namespace ebpf {
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std::vector<int> read_cpu_range(std::string path) {
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std::ifstream cpus_range_stream { path };
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std::vector<int> cpus;
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std::string cpu_range;
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while (std::getline(cpus_range_stream, cpu_range, ',')) {
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std::size_t rangeop = cpu_range.find('-');
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if (rangeop == std::string::npos) {
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cpus.push_back(std::stoi(cpu_range));
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}
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else {
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int start = std::stoi(cpu_range.substr(0, rangeop));
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int end = std::stoi(cpu_range.substr(rangeop + 1));
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for (int i = start; i <= end; i++)
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cpus.push_back(i);
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}
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}
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return cpus;
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}
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std::vector<int> get_online_cpus() {
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return read_cpu_range("/sys/devices/system/cpu/online");
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}
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std::vector<int> get_possible_cpus() {
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return read_cpu_range("/sys/devices/system/cpu/possible");
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}
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std::string get_pid_exe(pid_t pid) {
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char exe_path[4096];
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int res;
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std::string exe_link = tfm::format("/proc/%d/exe", pid);
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res = readlink(exe_link.c_str(), exe_path, sizeof(exe_path));
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if (res == -1)
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return "";
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if (res >= sizeof(exe_path))
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res = sizeof(exe_path) - 1;
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exe_path[res] = '\0';
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return std::string(exe_path);
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}
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} // namespace ebpf
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