int fclose (FILE *stream);
FILE *fdopen (int fd, char const *mode);
int fflush (FILE *stream);
-FILE *fopen (char const *pathname, char const *mode);
+FILE *fopen (char const *file_name, char const *mode);
int ferror (FILE *stream);
int fprintf (FILE *stream, char const *format, ...);
int fdputc (int c, int fd);