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79fa9765ca
We now use AK::Error and AK::ErrorOr<T> in both kernel and userspace! This was a slightly tedious refactoring that took a long time, so it's not unlikely that some bugs crept in. Nevertheless, it does pass basic functionality testing, and it's just real nice to finally see the same pattern in all contexts. :^)
68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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/Locking/Mutex.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 OpenFileDescription;
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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 ErrorOr<NonnullRefPtr<FIFO>> try_create(UserID);
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virtual ~FIFO() override;
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UserID uid() const { return m_uid; }
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ErrorOr<NonnullRefPtr<OpenFileDescription>> open_direction(Direction);
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ErrorOr<NonnullRefPtr<OpenFileDescription>> open_direction_blocking(Direction);
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Woverloaded-virtual"
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void attach(Direction);
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void detach(Direction);
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#pragma GCC diagnostic pop
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private:
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// ^File
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual ErrorOr<void> stat(::stat&) const override;
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virtual bool can_read(const OpenFileDescription&, size_t) const override;
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virtual bool can_write(const OpenFileDescription&, size_t) const override;
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virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_path(const OpenFileDescription&) const override;
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virtual StringView class_name() const override { return "FIFO"sv; }
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virtual bool is_fifo() const override { return true; }
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explicit FIFO(UserID, NonnullOwnPtr<DoubleBuffer> buffer);
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unsigned m_writers { 0 };
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unsigned m_readers { 0 };
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NonnullOwnPtr<DoubleBuffer> m_buffer;
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UserID 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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Mutex m_open_lock;
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};
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}
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