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