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#include "os.h"
#include <boost/algorithm/string/split.hpp>
#include <unistd.h>
#include <fstream>
#include <vector>
using namespace std::string_literals;
namespace {
std::string to_string(uint32_t v, size_t size)
{
std::string result{std::to_string(v)};
return (size > result.size() ? std::string(size - result.size(), char('0')) : ""s) + result;
}
std::string to_time_string(uint32_t sec)
{
uint32_t days = sec / (24 * 3600);
uint32_t hours = (sec % (24 * 3600)) / 3600;
uint32_t minutes = (sec % 3600) / 60;
uint32_t seconds = (sec % 60);
return std::to_string(days) + " days, "s + to_string(hours, 2) + ":"s + to_string(minutes, 2) + ":"s + to_string(seconds, 2);
}
uint64_t uptime()
{
double uptime_seconds{};
if (std::ifstream("/proc/uptime", std::ios::in) >> uptime_seconds)
{
return static_cast<uint64_t>(uptime_seconds);
}
return 0;
}
} // anonymous namespace
std::string Reichwein::OS::uptime_host()
{
return to_time_string(uptime());
}
std::string Reichwein::OS::uptime_process()
{
std::string filepath{"/proc/self/stat"};
std::ifstream f(filepath, std::ios::in);
if (f.is_open()) {
std::string line;
std::getline(f, line);
std::vector<std::string> elements;
boost::algorithm::split(elements, line, [](char c){ return c == ' '; });
if (elements.size() < 22)
throw std::runtime_error("Bad contents of /proc/self/stat");
long jiffies_per_second {sysconf(_SC_CLK_TCK)};
if (jiffies_per_second == 0)
throw std::runtime_error("Jiffies per second is 0");
try {
unsigned long starttime { std::stoul(elements[21])};
unsigned long runtime = uptime() - starttime / jiffies_per_second;
return to_time_string(runtime);
} catch (const std::exception& ex) {
throw std::runtime_error("Bad value in /proc/self/stat: "s + ex.what());
}
} else
throw std::runtime_error("Reading /proc/self/stat");
}
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