youtubebeat/vendor/github.com/elastic/beats/journalbeat/checkpoint/file_windows.go

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2018-11-18 11:08:38 +01:00
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package checkpoint
import (
"os"
"syscall"
)
const (
_FILE_FLAG_WRITE_THROUGH = 0x80000000
)
func create(path string) (*os.File, error) {
return createWriteThroughFile(path)
}
// createWriteThroughFile creates a file whose write operations do not go
// through any intermediary cache, they go directly to disk.
func createWriteThroughFile(path string) (*os.File, error) {
if len(path) == 0 {
return nil, syscall.ERROR_FILE_NOT_FOUND
}
pathp, err := syscall.UTF16PtrFromString(path)
if err != nil {
return nil, err
}
h, err := syscall.CreateFile(
pathp, // Path
syscall.GENERIC_READ|syscall.GENERIC_WRITE, // Access Mode
uint32(syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE), // Share Mode
nil, // Security Attributes
syscall.CREATE_ALWAYS, // Create Mode
uint32(syscall.FILE_ATTRIBUTE_NORMAL|_FILE_FLAG_WRITE_THROUGH), // Flags and Attributes
0) // Template File
return os.NewFile(uintptr(h), path), err
}