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* is an error code, or zero if no error. The val0 member is the
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* updated value of seqno; it has been incremented by 1 for each
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* packet sent. That increment may be less than nentries if an
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* handles equal to NETIO_PKT_HANDLE_NONE. The val1 member is the
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* updated value of nentries; it has been decremented by 1 for each
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* vector entry processed. Again, that decrement may be less than