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031243fee7
this supports mmap for marisa trie index related https://github.com/milvus-io/milvus/issues/21866 Signed-off-by: yah01 <yang.cen@zilliz.com>
72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. 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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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#pragma once
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#include <string>
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#include "common/EasyAssert.h"
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#include "common/Types.h"
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#include "fmt/core.h"
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#include <fcntl.h>
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#include <unistd.h>
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namespace milvus {
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class File {
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public:
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File(const File& file) = delete;
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File(File&& file) noexcept {
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fd_ = file.fd_;
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file.fd_ = -1;
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}
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~File() {
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if (fd_ >= 0) {
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close(fd_);
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}
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}
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static File
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Open(const std::string_view filepath, int flags) {
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int fd = open(filepath.data(), flags, S_IRUSR | S_IWUSR);
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AssertInfo(fd != -1,
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"failed to create mmap file {}: {}",
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filepath,
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strerror(errno));
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return File(fd);
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}
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int
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Descriptor() const {
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return fd_;
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}
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ssize_t
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Write(const void* buf, size_t size) {
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return write(fd_, buf, size);
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}
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offset_t
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Seek(offset_t offset, int whence) {
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return lseek(fd_, offset, whence);
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}
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void
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Close() {
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close(fd_);
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fd_ = -1;
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}
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private:
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explicit File(int fd) : fd_(fd) {
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}
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int fd_{-1};
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};
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} // namespace milvus
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