Can I set file permissions?

[yanhaogang]

Whether the file permission can be set, for example, LOCK. *.log, I need 640,but these files are 644,I can not update the permission.

[tolex469]

Yes it can

[yanhaogang]

if !readOnly {
logw, err = os.OpenFile(filepath.Join(path, "LOG"), os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return nil, err
}
logSize, err = logw.Seek(0, os.SEEK_END)
if err != nil {
logw.Close()
return nil, err
}
}

How do i cover 644?