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/*
* Copyright (C) 2022 Igalia S.L.
*
* 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 APPLE INC. ``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 APPLE INC. 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.
*/
#pragma once
#include <utility>
#include <wtf/Compiler.h>
#include <wtf/Noncopyable.h>
#include <wtf/StdLibExtras.h>
#include <wtf/UniStdExtras.h>
namespace WTF {
class UnixFileDescriptor {
public:
// This class is noncopyable because otherwise it's very hard to avoid accidental file
// descriptor duplication. If you intentionally want a dup, call the duplicate method.
WTF_MAKE_NONCOPYABLE(UnixFileDescriptor);
UnixFileDescriptor() = default;
enum AdoptionTag { Adopt };
UnixFileDescriptor(int fd, AdoptionTag)
: m_value(fd)
{ }
enum DuplicationTag { Duplicate };
UnixFileDescriptor(int fd, DuplicationTag)
{
if (fd >= 0)
m_value = dupCloseOnExec(fd);
}
UnixFileDescriptor(UnixFileDescriptor&& o)
{
m_value = o.release();
}
UnixFileDescriptor& operator=(UnixFileDescriptor&& o)
{
if (&o == this)
return *this;
this->~UnixFileDescriptor();
new (this) UnixFileDescriptor(WTFMove(o));
return *this;
}
~UnixFileDescriptor()
{
if (m_value >= 0)
closeWithRetry(std::exchange(m_value, -1));
}
explicit operator bool() const { return m_value >= 0; }
int value() const { return m_value; }
UnixFileDescriptor duplicate() const
{
return UnixFileDescriptor { m_value, Duplicate };
}
int release() WARN_UNUSED_RETURN { return std::exchange(m_value, -1); }
private:
int m_value { -1 };
};
} // namespace WTF
using WTF::UnixFileDescriptor;
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