char *fn_extension (const char *fn);
bool fn_is_absolute (const char *fn);
-bool fn_is_special (const char *fn);
bool fn_exists (const char *fn);
const char *fn_getenv (const char *variable);
FILE *fn_open (const char *fn, const char *mode);
int fn_close (const char *fn, FILE *file);
-FILE *create_stream (const char *fn, const char *mode, mode_t permissions);
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struct file_identity *fn_get_identity (const char *file_name);
void fn_free_identity (struct file_identity *);
int fn_compare_file_identities (const struct file_identity *,