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

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Noncompliant Code Example

This non-compliant noncompliant code example can fail because a copy of stdout is being used in the call to fputs().

int main(void) {
  FILE my_stdout = *(stdout);
  if (fputs("Hello, World!\n", &my_stdout) == EOF) {
    /* Handle Error */
  }
  return 0;
}

For example, this non-compliant noncompliant example fails with an "access violation" when compiled under Microsoft Visual Studio 2005 and run under Windows.

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