mirror of
https://github.com/matrix-construct/construct
synced 2024-11-12 13:01:07 +01:00
117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_FS_FD_H
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namespace ircd::fs
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{
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struct fd;
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size_t size(const fd &);
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size_t block_size(const fd &);
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ulong fstype(const fd &);
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ulong device(const fd &);
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uint64_t write_life(const fd &) noexcept;
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void write_life(const fd &, const uint64_t &);
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size_t advise(const fd &, const int &, const size_t & = 0, const opts & = opts_default);
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size_t evict(const fd &, const size_t &size = 0, const opts & = opts_default);
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}
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/// File Desc++ptor. This is simply a native fd (i.e. integer) with c++ object
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/// semantics.
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struct ircd::fs::fd
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{
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struct opts;
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int fdno {-1};
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public:
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operator const int &() const;
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operator bool() const;
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bool operator!() const;
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opts options() const;
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int release() noexcept;
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explicit fd(const int &);
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fd(const int &dirfd, const string_view &path, const opts &);
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fd(const string_view &path, const opts &);
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fd(const string_view &path);
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fd() = default;
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fd(fd &&) noexcept;
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fd(const fd &) = delete;
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fd &operator=(fd &&) noexcept;
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fd &operator=(const fd &) = delete;
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~fd() noexcept;
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};
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/// Descriptor options (open options)
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struct ircd::fs::fd::opts
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:fs::opts
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{
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static conf::item<bool> direct_io_enable;
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/// std openmode passed from ctor.
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std::ios::openmode mode {std::ios::openmode(0)};
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/// open(2) flags. Usually generated from ios::open_mode ctor.
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ulong flags {0};
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/// open(2) mode_t mode used for file creation.
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ulong mask {0};
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/// Seek to end after open. This exists to convey the flag for open_mode.
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bool ate {false};
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/// (O_DIRECT) Direct IO bypassing the operating system caches.
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bool direct {false};
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/// (O_CLOEXEC) Close this descriptor on an exec().
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bool cloexec {true};
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/// Allows file to be created if it doesn't exist. Set this to false to
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/// prevent file from being created when opened with a write-mode.
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bool create {true};
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/// Allows file to opened if and only if it doesn't exist and will be
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/// created by this open().
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bool exclusive {false};
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/// Advise for random access (ignored when direct=true)
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bool random {false};
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/// Advise for sequential access (ignored when direct=true)
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bool sequential {false};
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/// Advise for dontneed access (ignored when direct=true)
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bool dontneed {false};
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};
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inline bool
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ircd::fs::fd::operator!()
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const
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{
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return !bool(*this);
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}
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inline ircd::fs::fd::operator
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bool()
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const
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{
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return int(*this) >= 0;
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}
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inline ircd::fs::fd::operator
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const int &()
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const
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{
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return fdno;
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}
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