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50 lines
1.7 KiB
Go
50 lines
1.7 KiB
Go
//go:build windows
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// +build windows
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/*
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Copyright 2024 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package logs
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import (
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"os"
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"syscall"
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)
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// Based on Windows implementation of Windows' syscall.Open
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// https://cs.opensource.google/go/go/+/refs/tags/go1.22.2:src/syscall/syscall_windows.go;l=342
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// In addition to syscall.Open, this function also adds the syscall.FILE_SHARE_DELETE flag to sharemode,
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// which will allow us to read from the file without blocking the file from being deleted or renamed.
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// This is essential for Log Rotation which is done by renaming the open file. Without this, the file rename would fail.
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func openFileShareDelete(path string) (*os.File, error) {
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pathp, err := syscall.UTF16PtrFromString(path)
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if err != nil {
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return nil, err
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}
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var access uint32 = syscall.GENERIC_READ
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var sharemode uint32 = syscall.FILE_SHARE_READ | syscall.FILE_SHARE_WRITE | syscall.FILE_SHARE_DELETE
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var createmode uint32 = syscall.OPEN_EXISTING
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var attrs uint32 = syscall.FILE_ATTRIBUTE_NORMAL
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handle, err := syscall.CreateFile(pathp, access, sharemode, nil, createmode, attrs, 0)
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if err != nil {
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return nil, err
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}
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return os.NewFile(uintptr(handle), path), nil
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}
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