ladybird/Userland/Services/ProtocolServer/Protocol.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/HashMap.h>
#include <ProtocolServer/Protocol.h>
#include <fcntl.h>
#include <string.h>

namespace ProtocolServer {

static HashMap<String, Protocol*>& all_protocols()
{
    static HashMap<String, Protocol*> map;
    return map;
}

Protocol* Protocol::find_by_name(const String& name)
{
    return all_protocols().get(name).value_or(nullptr);
}

Protocol::Protocol(const String& name)
{
    all_protocols().set(name, this);
}

Protocol::~Protocol()
{
    ASSERT_NOT_REACHED();
}

Result<Protocol::Pipe, String> Protocol::get_pipe_for_download()
{
    int fd_pair[2] { 0 };
    if (pipe(fd_pair) != 0) {
        auto saved_errno = errno;
        dbgln("Protocol: pipe() failed: {}", strerror(saved_errno));
        return String { strerror(saved_errno) };
    }
    fcntl(fd_pair[1], F_SETFL, fcntl(fd_pair[1], F_GETFL) | O_NONBLOCK);
    return Pipe { fd_pair[0], fd_pair[1] };
}

}