According to the C Standard, Section 7.21.3, para. paragraph 6 [ISO/IEC 9899:2011],
The address of the
FILE
object used to control a stream may be significant; a copy of aFILE
object need not serve in place of the original.
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ISO/IEC 9899:2011 Section 7.21.3, "Files"
ISO/IEC TR TS 17961 (Draft) Copying a FILE object [filecpy]
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