hmz007
36ed224bac
Signed-off-by: hmz007 <hmz007@gmail.com> Change-Id: Ib87fdbe7a0be7dc961af3500fe9ea4589a127f9f
80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
//
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// Copyright (C) 2022 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include <errno.h>
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#include <string.h>
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#include <algorithm>
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#include <iostream>
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#include <numeric>
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#include <type_traits>
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#include <vector>
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#ifndef __IO_URING_SQE_CPP_H
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#define __IO_URING_SQE_CPP_H
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namespace io_uring_cpp {
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struct [[nodiscard]] IoUringSubmitResult {
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constexpr bool IsOk() const { return ret > 0; }
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const char *ErrMsg() const {
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if (IsOk()) {
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return nullptr;
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}
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return strerror(-ret);
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}
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constexpr auto ErrCode() const { return std::min(ret, 0); }
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constexpr auto EntriesSubmitted() const { return std::max(ret, 0); }
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int ret;
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};
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struct [[nodiscard]] Errno {
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constexpr Errno(int ret) : error_code(ret) {
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error_code = std::abs(error_code);
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}
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int error_code;
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constexpr int ErrCode() { return error_code; }
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const char *ErrMsg();
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constexpr bool IsOk() const { return error_code == 0; }
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};
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std::ostream &operator<<(std::ostream &, Errno err);
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struct [[nodiscard]] IoUringSQE {
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constexpr IoUringSQE(void *p) : sqe(p) {}
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IoUringSQE &SetFlags(unsigned int flags);
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template <typename T>
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IoUringSQE &SetData(const T &data) {
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static_assert(
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std::is_trivially_copy_constructible_v<T>,
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"Only trivially copiable types can be passed for io_uring data");
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static_assert(sizeof(T) <= 8,
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"io_uring SQE's data field has size of 8 bytes, can't pass "
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"data larger than that.");
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return SetData(*reinterpret_cast<const uint64_t*>(&data));
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}
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IoUringSQE& SetData(uint64_t data);
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constexpr bool IsOk() const { return sqe != nullptr; }
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private:
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void *sqe;
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};
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} // namespace io_uring_cpp
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#endif
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