mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 02:32:43 +01:00
76 lines
3.4 KiB
C++
76 lines
3.4 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_WRITE_H
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namespace ircd::fs
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{
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struct write_opts extern const write_opts_default;
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// Yields ircd::ctx for write from buffers; returns bytes written
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size_t write(const fd &, const const_buffers &, const write_opts & = write_opts_default);
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size_t write(const string_view &path, const const_buffers &, const write_opts & = write_opts_default);
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// Yields ircd::ctx for write from buffer; returns view of written portion
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const_buffer write(const fd &, const const_buffer &, const write_opts & = write_opts_default);
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const_buffer write(const string_view &path, const const_buffer &, const write_opts & = write_opts_default);
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// Yields ircd::ctx to append to file from buffers; returns bytes appended
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size_t append(const fd &, const const_buffers &, const write_opts & = write_opts_default);
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size_t append(const string_view &path, const const_buffers &, const write_opts & = write_opts_default);
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// Yields ircd::ctx to append to file from buffer; returns view of written portion
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const_buffer append(const fd &, const const_buffer &, const write_opts & = write_opts_default);
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const_buffer append(const string_view &path, const const_buffer &, const write_opts & = write_opts_default);
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// Yields ircd::ctx to overwrite (trunc) file from buffers; returns bytes written
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size_t overwrite(const fd &, const const_buffers &, const write_opts & = write_opts_default);
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size_t overwrite(const string_view &path, const const_buffers &, const write_opts & = write_opts_default);
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// Yields ircd::ctx to overwrite (trunc) file from buffer; returns view of written portion
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const_buffer overwrite(const fd &, const const_buffer & = {}, const write_opts & = write_opts_default);
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const_buffer overwrite(const string_view &path, const const_buffer & = {}, const write_opts & = write_opts_default);
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// Truncate file to explicit size
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void truncate(const fd &, const size_t &, const write_opts & = write_opts_default);
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void truncate(const string_view &path, const size_t &, const write_opts & = write_opts_default);
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// Allocate
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void allocate(const fd &, const size_t &size, const write_opts & = write_opts_default);
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}
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/// Options for a write operation
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struct ircd::fs::write_opts
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:opts
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{
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/// for allocate()
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bool keep_size {false};
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/// Yields the ircd::ctx until the buffers are written. This performs
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/// the unix incremental write loop internally. When this option is true,
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/// any return value from a function in the write() suite will not be a
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/// partial value requiring another invocation of write().
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bool all {true};
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/// Whether to propagate an EINTR; otherwise we reinvoke the syscall. For a
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/// write(2) family call this can only happen before any data was written;
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/// an exception will be thrown. We default to true because we have faith
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/// in the useful propagation of an exception for this event.
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bool interruptible {true};
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write_opts(const off_t &);
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write_opts() = default;
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};
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inline
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ircd::fs::write_opts::write_opts(const off_t &offset)
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:opts{offset}
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{}
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