void clearerr( FILE *stream);
int feof( FILE *stream);
int ferror( FILE *stream);
int fileno( FILE *stream);
The function feof tests the end-of-file indicator for the stream pointed to by stream, returning non-zero if it is set. The end-of-file indicator can only be cleared by the function clearerr.
The function ferror tests the error indicator for the stream pointed to by stream, returning non-zero if it is set. The error indicator can only be reset by the clearerr function.
The function fileno examines the argument stream and returns its integer descriptor.