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/*
* Copyright 2012-2020 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - 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
* FOUNDATION 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.
*/
#ifndef UNIQUE_FILE_DESCRIPTOR_HXX
#define UNIQUE_FILE_DESCRIPTOR_HXX
#include "FileDescriptor.hxx" // IWYU pragma: export
#include <cassert>
#include <utility>
/**
* An OO wrapper for a UNIX file descriptor.
*/
class UniqueFileDescriptor : public FileDescriptor {
public:
UniqueFileDescriptor() noexcept
:FileDescriptor(FileDescriptor::Undefined()) {}
explicit UniqueFileDescriptor(int _fd) noexcept
:FileDescriptor(_fd) {}
explicit UniqueFileDescriptor(FileDescriptor _fd) noexcept
:FileDescriptor(_fd) {}
UniqueFileDescriptor(const UniqueFileDescriptor &) = delete;
UniqueFileDescriptor(UniqueFileDescriptor &&other) noexcept
:FileDescriptor(other.Steal()) {}
~UniqueFileDescriptor() noexcept {
Close();
}
UniqueFileDescriptor &operator=(UniqueFileDescriptor &&other) noexcept {
using std::swap;
swap(fd, other.fd);
return *this;
}
/**
* Release ownership and return the descriptor as an unmanaged
* #FileDescriptor instance.
*/
FileDescriptor Release() noexcept {
return std::exchange(*(FileDescriptor *)this, Undefined());
}
protected:
void Set(int _fd) noexcept {
assert(!IsDefined());
assert(_fd >= 0);
FileDescriptor::Set(_fd);
}
public:
#ifndef _WIN32
static bool CreatePipe(UniqueFileDescriptor &r, UniqueFileDescriptor &w) noexcept {
return FileDescriptor::CreatePipe(r, w);
}
static bool CreatePipeNonBlock(UniqueFileDescriptor &r,
UniqueFileDescriptor &w) noexcept {
return FileDescriptor::CreatePipeNonBlock(r, w);
}
static bool CreatePipe(FileDescriptor &r, FileDescriptor &w) noexcept;
#endif
bool Close() noexcept {
return IsDefined() && FileDescriptor::Close();
}
};
#endif
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