extern struct spwd *__spw_dup(const struct spwd *);
extern void __spw_set_changed(void);
extern int spw_close(void);
extern int spw_file_present(void);
extern const struct spwd *spw_locate(const char *);
extern int spw_lock(void);
extern int spw_name(const char *);
extern const struct spwd *spw_next(void);
extern int spw_open(int);
extern int spw_remove(const char *);
extern int spw_rewind(void);
extern int spw_unlock(void);
extern int spw_update(const struct spwd *);