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Use ifstream to reaad /proc/meminfo

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This commit is contained in:
Robinhuett 2018-11-09 16:24:13 +01:00
parent 6b62079d8a
commit 9ea0815dea
2 changed files with 45 additions and 17 deletions
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2
include/modules/memory.hpp
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@ -1,7 +1,7 @@
#pragma once
#include <fmt/format.h>
#include <stdio.h>
#include <fstream>
#include "util/chrono.hpp"
#include "ALabel.hpp"

50
src/modules/memory.cpp
View File

@ -14,28 +14,56 @@ waybar::modules::Memory::Memory(const Json::Value& config)
auto waybar::modules::Memory::update() -> void
{
parseMeminfo();
if(memtotal_ > 0 && memfree_ >= 0) {
int used_ram_percentage = 100 * (memtotal_ - memfree_) / memtotal_;
label_.set_text(fmt::format(format_, used_ram_percentage));
auto used_ram_gigabytes = (memtotal_ - memfree_) / std::pow(1024, 2);
label_.set_tooltip_text(fmt::format("{:.{}f}Gb used", used_ram_gigabytes, 1));
label_.show();
} else {
label_.hide();
}
}
void waybar::modules::Memory::parseMeminfo()
{
int memtotal, memfree, memavail, membuffer, memcache;
FILE* info = fopen("/proc/meminfo","r");
if(fscanf (info, "MemTotal: %d kB MemFree: %d kB Buffers: %d kB Cached: %d kB",&memtotal, &memfree, &membuffer, &memcache) < 4) { // Old meminfo format
rewind(info);
if(fscanf(info, "MemTotal: %d kB MemFree: %d kB MemAvailable: %d kB Buffers: %d kB Cached: %d kB",&memtotal, &memfree, &memavail, &membuffer, &memcache) < 5) { // Current meminfo format
memtotal_ = -1;
memfree_ = -1;
} else {
memtotal_ = memtotal;
memfree_ = memavail;
long memtotal = -1, memfree = -1, membuffer = -1, memcache = -1, memavail = -1;
int count = 0;
std::string line;
std::ifstream info("/proc/meminfo");
if(info.is_open()) {
while(getline(info, line)) {
auto posDelim = line.find(":");
std::string name = line.substr(0, posDelim);
long value = std::stol(line.substr(posDelim + 1));
if(name.compare("MemTotal") == 0) {
memtotal = value;
count++;
} else if(name.compare("MemAvailable") == 0) {
memavail = value;
count++;
} else if(name.compare("MemFree") == 0) {
memfree = value;
count++;
} else if(name.compare("Buffers") == 0) {
membuffer = value;
count++;
} else if(name.compare("Cached") == 0) {
memcache = value;
count++;
}
if (count >= 5 || (count >= 4 && memavail >= -1)) {
info.close();
}
}
} else {
throw std::runtime_error("Can't open /proc/meminfo");
}
memtotal_ = memtotal;
if(memavail >= 0) {
memfree_ = memavail;
} else {
memfree_ = memfree + (membuffer + memcache);
}
fclose(info);
}