int my_fopenr(const char *path, const char *mode, istream *os);
int my_fopen(const char *path, const char *mode, ostream *os);
int my_fseek(ostream *stream, long offset, int whence);
int my_fopenr(const char *path, const char *mode, istream *os);
int my_fopen(const char *path, const char *mode, ostream *os);
int my_fseek(ostream *stream, long offset, int whence);