mirror of
https://github.com/matrix-construct/construct
synced 2024-10-03 06:08:52 +02:00
42 lines
1.7 KiB
C++
42 lines
1.7 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_IOV_H
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extern "C"
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{
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struct iovec;
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};
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namespace ircd::fs
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{
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using const_iovec_view = vector_view<const struct ::iovec>;
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using iovec_view = vector_view<struct ::iovec>;
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using const_buffers = vector_view<const const_buffer>;
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using mutable_buffers = vector_view<const mutable_buffer>;
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// utility; count the total bytes of an iov.
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size_t bytes(const const_iovec_view &);
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// Transforms our buffers to struct iovec ones. The offset value allows
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// a front-truncation of the input buffers when transforming. This is
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// useful for progressive readv()'s filling the buffers.
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const_iovec_view make_iov(const iovec_view &, const const_buffers &, const size_t &off = 0);
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const_iovec_view make_iov(const iovec_view &, const mutable_buffers &, const size_t &off = 0);
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// Transforms our buffers to struct iovec ones. This is done using an
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// internal thread_local array of IOV_MAX. The returned view is of that
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// array. We get away with using a single buffer because the synchronous
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// readv()/writev() calls block the thread and for AIO the iov is copied out
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// of userspace on io_submit().
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const_iovec_view make_iov(const const_buffers &, const size_t &off = 0);
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const_iovec_view make_iov(const mutable_buffers &, const size_t &off = 0);
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}
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