SEI CERT C Coding Standard

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The address of the FILE object used to control a stream may be significant; a copy of a FILE object need not serve in place of the original.

According to C99, Section 7.19.3 p6:

The address of the FILE object used to control a stream may be significant; a copy of a FILE object need not serve in place of the original.

Consequently, do not use a copy of a FILE object in any input/output operations.

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