fcf98514cb
The dup() function returns a duplicate of the file descriptor. Wrapping it in a FileDescriptor isn't wrong as such, but it prevents from using it in contexts where a UniqueFD is needed. As the duplicate is guaranteed to have a single owner when created, return it as a UniqueFD instead. A FileDescriptor can easily be created from the UniqueFD if desired. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Hirokazu Honda <hiroh@chromium.org> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
50 lines
934 B
C++
50 lines
934 B
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2019, Google Inc.
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*
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* file_descriptor.h - File descriptor wrapper
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*/
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#pragma once
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#include <memory>
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namespace libcamera {
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class UniqueFD;
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class FileDescriptor final
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{
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public:
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explicit FileDescriptor(const int &fd = -1);
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explicit FileDescriptor(int &&fd);
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explicit FileDescriptor(UniqueFD fd);
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FileDescriptor(const FileDescriptor &other);
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FileDescriptor(FileDescriptor &&other);
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~FileDescriptor();
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FileDescriptor &operator=(const FileDescriptor &other);
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FileDescriptor &operator=(FileDescriptor &&other);
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bool isValid() const { return fd_ != nullptr; }
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int fd() const { return fd_ ? fd_->fd() : -1; }
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UniqueFD dup() const;
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private:
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class Descriptor
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{
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public:
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Descriptor(int fd, bool duplicate);
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~Descriptor();
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int fd() const { return fd_; }
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private:
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int fd_;
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};
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std::shared_ptr<Descriptor> fd_;
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};
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} /* namespace libcamera */
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