Ubuntu temperature and cpu frequency

src/CpuTemperatureMonitor.cpp

@@ -0,0 +1,118 @@
+// Copyright (c) 2022 Robin Davies
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+#include "CpuTemperatureMonitor.hpp"
+
+#include <iostream>
+#include <filesystem>
+#include <fstream>
+#include <string>
+#include <string_view>
+#include <optional>
+#include <system_error>
+
+namespace fs = std::filesystem;
+using namespace pipedal;
+
+
+
+static constexpr std::string_view THERMAL_PATH = "/sys/class/thermal/";
+
+
+static std::optional<std::string> readFile(const fs::path& path) {
+    std::ifstream file(path);
+    if (!file) {
+        return std::nullopt;
+    }
+    
+    std::string content;
+    std::getline(file, content);
+    return content;
+}
+
+
+static bool isCpuThermal(const fs::path &zone_path) {
+    auto type = readFile(zone_path / "type");
+    return type && (*type == "cpu-thermal") || (*type == "x86_pkg_temp");
+}
+
+
+
+
+class CpuTemperatureMonitorImpl: public CpuTemperatureMonitor {
+private:
+    std::vector<fs::path> cpuZones;
+public:
+    explicit CpuTemperatureMonitorImpl(std::vector<fs::path>&&cpuZones) 
+    : cpuZones(std::move(cpuZones)) {
+    }
+
+
+    virtual float GetTemperatureC() override {
+        float result = INVALID_TEMPERATURE*1000;
+
+        for (const auto&cpuZone: cpuZones)
+        {
+
+            std::ifstream file(cpuZone / "temp");
+            if (file) {
+                float v;
+                file >> v;
+                if (file)
+                {
+                    if (v > result)
+                    {
+                        result = v;
+                    }
+                }
+            }
+        }
+        return result/1000;
+    }
+};
+
+static std::vector<fs::path> findCpuThermalZones() {
+    std::vector<fs::path> cpu_zones;
+    std::error_code ec;
+    
+    for (const auto& entry : fs::directory_iterator(THERMAL_PATH, ec)) {
+        if (ec) {
+            std::cerr << "Error reading directory: " << ec.message() << '\n';
+            continue;
+        }
+        
+        const auto& path = entry.path();
+        if (path.filename().string().find("thermal_zone") == 0) {
+            if (isCpuThermal(path)) {
+                cpu_zones.push_back(path);
+            }
+        }
+    }
+    return cpu_zones;
+}
+
+
+CpuTemperatureMonitor::ptr CpuTemperatureMonitor::Get()
+{
+
+    std::vector<fs::path> cpuZones = findCpuThermalZones();
+
+    return std::make_unique<CpuTemperatureMonitorImpl>(std::move(cpuZones));
+}