package flock import "os" type plan9Lock struct { f *os.File } func (l *plan9Lock) Release() error { return l.f.Close() } func newLock(fileName string) (Releaser, error) { f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, os.ModeExclusive|0644) if err != nil { return nil, err } return &plan9Lock{f}, nil }