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/*
* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Noncopyable.h>
#include <AK/StdLibExtras.h>
#include <unistd.h>
namespace IPC {
class File {
AK_MAKE_NONCOPYABLE(File);
public:
// Must have a default constructor, because LibIPC
// default-constructs arguments prior to decoding them.
File() = default;
// Intentionally not `explicit`.
File(int fd)
: m_fd(fd)
{
}
// Tagged constructor for fd's that should be closed on destruction unless take_fd() is called.
// Note that the tags are the same, this is intentional to allow expressive invocation.
enum Tag {
ConstructWithReceivedFileDescriptor = 1,
CloseAfterSending = 1,
};
File(int fd, Tag)
: m_fd(fd)
, m_close_on_destruction(true)
{
}
File(File&& other)
: m_fd(exchange(other.m_fd, -1))
, m_close_on_destruction(exchange(other.m_close_on_destruction, false))
{
}
File& operator=(File&& other)
{
if (this != &other) {
m_fd = exchange(other.m_fd, -1);
m_close_on_destruction = exchange(other.m_close_on_destruction, false);
}
return *this;
}
~File()
{
if (m_close_on_destruction && m_fd != -1)
close(m_fd);
}
int fd() const { return m_fd; }
// NOTE: This is 'const' since generated IPC messages expose all parameters by const reference.
[[nodiscard]] int take_fd() const
{
return exchange(m_fd, -1);
}
private:
mutable int m_fd { -1 };
bool m_close_on_destruction { false };
};
}
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