mirror of
https://github.com/SerenityOS/serenity
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85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <Kernel/DoubleBuffer.h>
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#include <Kernel/FileSystem/File.h>
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#include <Kernel/Lock.h>
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#include <Kernel/UnixTypes.h>
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#include <Kernel/WaitQueue.h>
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namespace Kernel {
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class FileDescription;
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class FIFO final : public File {
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public:
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enum class Direction : u8 {
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Neither,
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Reader,
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Writer
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};
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static NonnullRefPtr<FIFO> create(uid_t);
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virtual ~FIFO() override;
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uid_t uid() const { return m_uid; }
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KResultOr<NonnullRefPtr<FileDescription>> open_direction(Direction);
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KResultOr<NonnullRefPtr<FileDescription>> open_direction_blocking(Direction);
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void attach(Direction);
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void detach(Direction);
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private:
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// ^File
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual KResult stat(::stat&) const override;
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual bool can_write(const FileDescription&, size_t) const override;
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virtual String absolute_path(const FileDescription&) const override;
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virtual const char* class_name() const override { return "FIFO"; }
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virtual bool is_fifo() const override { return true; }
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explicit FIFO(uid_t);
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unsigned m_writers { 0 };
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unsigned m_readers { 0 };
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DoubleBuffer m_buffer;
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uid_t m_uid { 0 };
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int m_fifo_id { 0 };
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WaitQueue m_read_open_queue;
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WaitQueue m_write_open_queue;
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Lock m_open_lock;
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};
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}
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