SWI-Prolog -- API-function PL_unify

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PL_unify_stream()

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Documentation
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  - Foreign Language Interface
    - Foreign access to Prolog IO streams
      - Creating an IO stream
        
        Snew()
        
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        PL_unify_stream()
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Availability:C-language interface function

int PL_unify_stream(term_t t, IOSTREAM *s)

Unify t with a blob that points at s. Note that a blob provides a unique and reliable reference to a stream. Blobs are subject to atom garbage collection. If an open stream is garbage collected the behaviour depends on the Prolog flag agc_close_streams. See also Sgcclose().