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// Copyright (C) 2020 Joel Rosdahl and other contributors
//
// See doc/AUTHORS.adoc for a complete list of contributors.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#pragma once
#include "system.hpp"
#include "NonCopyable.hpp"
#include "assertions.hpp"
class Fd : NonCopyable
{
public:
Fd() = default;
explicit Fd(int fd);
Fd(Fd&& other_fd) noexcept;
~Fd();
explicit operator bool() const;
int get() const;
int operator*() const;
Fd& operator=(Fd&& other_fd) noexcept;
// Close wrapped fd before the lifetime of Fd has ended.
bool close();
// Release ownership of wrapped fd.
int release();
private:
int m_fd = -1;
};
inline Fd::Fd(int fd) : m_fd(fd)
{
}
inline Fd::Fd(Fd&& other_fd) noexcept : m_fd(other_fd.release())
{
}
inline Fd::~Fd()
{
close();
}
inline Fd::operator bool() const
{
return m_fd != -1;
}
inline int
Fd::get() const
{
return m_fd;
}
// clang-format off
inline int
Fd::operator*() const
// clang-format on
{
ASSERT(m_fd != -1);
return m_fd;
}
inline Fd&
Fd::operator=(Fd&& other_fd) noexcept
{
close();
m_fd = other_fd.release();
return *this;
}
inline bool
Fd::close()
{
return m_fd != -1 && ::close(release()) == 0;
}
inline int
Fd::release()
{
int fd = m_fd;
m_fd = -1;
return fd;
}
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