ladybird/Userland/Libraries/LibCore/Notifier.cpp

/*
 * 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/Badge.h>
#include <LibCore/Event.h>
#include <LibCore/EventLoop.h>
#include <LibCore/Notifier.h>

namespace Core {

Notifier::Notifier(int fd, unsigned event_mask, Object* parent)
    : Object(parent)
    , m_fd(fd)
    , m_event_mask(event_mask)
{
    set_enabled(true);
}

Notifier::~Notifier()
{
    set_enabled(false);
}

void Notifier::set_enabled(bool enabled)
{
    if (m_fd < 0)
        return;
    if (enabled)
        Core::EventLoop::register_notifier({}, *this);
    else
        Core::EventLoop::unregister_notifier({}, *this);
}

void Notifier::close()
{
    if (m_fd < 0)
        return;
    set_enabled(false);
    m_fd = -1;
}

void Notifier::event(Core::Event& event)
{
    if (event.type() == Core::Event::NotifierRead && on_ready_to_read) {
        on_ready_to_read();
    } else if (event.type() == Core::Event::NotifierWrite && on_ready_to_write) {
        on_ready_to_write();
    } else {
        Object::event(event);
    }
}

}