70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
/*
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* Copyright 2020 Max Kellermann <max.kellermann@gmail.com>
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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
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "ReadOperation.hxx"
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#include "Queue.hxx"
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#include "io/FileDescriptor.hxx"
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#include <cassert>
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namespace Uring {
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void
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ReadOperation::Start(Queue &queue, FileDescriptor fd, off_t offset,
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std::size_t size, ReadHandler &_handler) noexcept
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{
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assert(!buffer);
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handler = &_handler;
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buffer = std::make_unique<std::byte[]>(size);
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auto &s = queue.RequireSubmitEntry();
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iov.iov_base = buffer.get();
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iov.iov_len = size;
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io_uring_prep_readv(&s, fd.Get(), &iov, 1, offset);
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queue.Push(s, *this);
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}
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void
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ReadOperation::OnUringCompletion(int res) noexcept
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{
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if (handler == nullptr)
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/* operation was canceled */
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delete this;
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else if (res >= 0)
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handler->OnRead(std::move(buffer), res);
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else
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handler->OnReadError(-res);
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}
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} // namespace Uring
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