Close the stream. This first locks the stream (see PL_acquire_stream()).
When successful it flushes pending output and calls the
Sclose_function() hook. Finally, the stream is unlocked and all
memory associated to the stream is released. On success, the function
returns 0. On failure a Prolog exception is raised and the return value
is -1. Regardless of the return value, s becomes invalid
after completion of Sclose().
See also Sgcclose().
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