mirror of https://github.com/siddontang/go.git
37 lines
755 B
Go
37 lines
755 B
Go
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// Copyright 2013 The LevelDB-Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package filelock
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import (
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"io"
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"syscall"
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)
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// lockCloser hides all of an syscall.Handle's methods, except for Close.
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type lockCloser struct {
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fd syscall.Handle
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}
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func (l lockCloser) Close() error {
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return syscall.Close(l.fd)
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}
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func Lock(name string) (io.Closer, error) {
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p, err := syscall.UTF16PtrFromString(name)
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if err != nil {
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return nil, err
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}
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fd, err := syscall.CreateFile(p,
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syscall.GENERIC_READ|syscall.GENERIC_WRITE,
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0, nil, syscall.CREATE_ALWAYS,
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syscall.FILE_ATTRIBUTE_NORMAL,
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0,
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)
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if err != nil {
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return nil, err
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}
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return lockCloser{fd: fd}, nil
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}
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