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func (fd *FD) Close() error {
    // Take both locks, to exclude read and write operations from
    // accessing a closed sysfd.
    if err := fd.Lock(); err != nil {
        debugf("FD %03d: CL: Closed", fd.id)
        return err
    }
    defer fd.Unlock()
+   if fd.closed {
+       return ErrClosed
+   }
    fd.closed = true
        ...