linux_memoryload.cpp

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/**
 * @author: Daniel Fuchs
 * @contact: fuxeysolutions@gmail.com
 *
 * distributed under the MIT License (MIT).
 * Copyright (c) Daniel Fuchs
 *
 */
#include "linux_memoryload.hpp"
 
#include <cinttypes>
#include <cmath>
#include <fstream>
#include <iostream>
 
bool
memoryLoad::parseMemoryFile()
{
    if (timeStamp + std::chrono::milliseconds(10) > std::chrono::steady_clock::now())
    {
        return true;
    }
    std::ifstream memoryFile;
    memoryFile.open(this->memInfoFile);
    this->timeStamp = std::chrono::steady_clock::now();
    if (!memoryFile.is_open())
    {
        return false;
    }
 
    std::string line;
    while (std::getline(memoryFile, line))
    {
        sscanf(line.c_str(), "MemTotal: %" PRIu64, &this->totalMemoryInKB);
        sscanf(line.c_str(), "MemAvailable: %" PRIu64, &this->currentMemoryUsageInKB);
    }
    memoryFile.close();
    return true;
}
 
uint64_t
memoryLoad::getTotalMemoryInKB()
{
    this->parseMemoryFile();
    return this->totalMemoryInKB;
}
 
uint64_t
memoryLoad::getCurrentMemUsageInKB()
{
    this->parseMemoryFile();
    return this->getTotalMemoryInKB() - this->currentMemoryUsageInKB;
}
 
float
memoryLoad::getCurrentMemUsageInPercent()
{
    this->parseMemoryFile();
    uint64_t memavail = this->getCurrentMemUsageInKB();
    return round((((memavail * 100.0 / this->getTotalMemoryInKB()))) * 100.0) / 100.0;
}
 
uint64_t
memoryLoad::getMemoryUsageByThisProcess()
{
    return this->parseProcessMemoryFile(this->memInfoOfProcessFile);
}
 
uint64_t
memoryLoad::getMemoryUsedByProcess(int pid)
{
    return memoryLoad::parseProcessMemoryFile("/proc/" + std::to_string(pid) + "/status");
}
 
uint64_t
memoryLoad::parseProcessMemoryFile(std::string fileToParse)
{
    uint64_t MemFree = 0;
    std::ifstream memoryFile;
    memoryFile.open(fileToParse);
    std::string line;
    while (std::getline(memoryFile, line))
    {
        sscanf(line.c_str(), "VmSize: %" PRIu64, &MemFree);
    }
    return MemFree;
}