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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/CircularQueue.h>
#include <LibCore/ProcessStatisticsReader.h>
#include <LibGUI/Application.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Widget.h>
#include <LibGUI/Window.h>
#include <LibGfx/Palette.h>
#include <stdio.h>
class GraphWidget final : public GUI::Widget {
C_OBJECT(GraphWidget)
public:
GraphWidget()
: GUI::Widget(nullptr)
{
start_timer(1000);
}
virtual ~GraphWidget() override {}
private:
virtual void timer_event(Core::TimerEvent&) override
{
unsigned busy;
unsigned idle;
get_cpu_usage(busy, idle);
unsigned busy_diff = busy - m_last_busy;
unsigned idle_diff = idle - m_last_idle;
m_last_busy = busy;
m_last_idle = idle;
float cpu = (float)busy_diff / (float)(busy_diff + idle_diff);
m_cpu_history.enqueue(cpu);
update();
}
virtual void paint_event(GUI::PaintEvent& event) override
{
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.fill_rect(event.rect(), Color::Black);
int i = m_cpu_history.capacity() - m_cpu_history.size();
for (auto cpu_usage : m_cpu_history) {
painter.draw_line(
{ i, rect().bottom() },
{ i, (int)(height() - (cpu_usage * (float)height())) },
palette().menu_selection());
++i;
}
}
virtual void mousedown_event(GUI::MouseEvent& event) override
{
if (event.button() != GUI::MouseButton::Left)
return;
pid_t pid = fork();
if (pid < 0) {
perror("fork");
} else if (pid == 0) {
execl("/bin/SystemMonitor", "SystemMonitor", nullptr);
perror("execl");
ASSERT_NOT_REACHED();
}
}
static void get_cpu_usage(unsigned& busy, unsigned& idle)
{
busy = 0;
idle = 0;
auto all_processes = Core::ProcessStatisticsReader::get_all();
for (auto& it : all_processes) {
for (auto& jt : it.value.threads) {
if (it.value.pid == 0)
idle += jt.times_scheduled;
else
busy += jt.times_scheduled;
}
}
}
CircularQueue<float, 30> m_cpu_history;
unsigned m_last_busy { 0 };
unsigned m_last_idle { 0 };
};
int main(int argc, char** argv)
{
if (pledge("stdio shared_buffer accept proc exec rpath unix cpath fattr", nullptr) < 0) {
perror("pledge");
return 1;
}
GUI::Application app(argc, argv);
if (pledge("stdio shared_buffer accept proc exec rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
auto window = GUI::Window::construct();
window->set_title("CPUGraph");
window->set_window_type(GUI::WindowType::MenuApplet);
window->resize(30, 16);
auto widget = GraphWidget::construct();
window->set_main_widget(widget);
window->show();
if (unveil("/res", "r") < 0) {
perror("unveil");
return 1;
}
// FIXME: This is required by Core::ProcessStatisticsReader.
// It would be good if we didn't depend on that.
if (unveil("/etc/passwd", "r") < 0) {
perror("unveil");
return 1;
}
if (unveil("/proc/all", "r") < 0) {
perror("unveil");
return 1;
}
if (unveil("/bin/SystemMonitor", "x") < 0) {
perror("unveil");
return 1;
}
unveil(nullptr, nullptr);
return app.exec();
}
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