extern struct sgrp *__sgr_dup(const struct sgrp *);
extern void __sgr_set_changed(void);
extern int sgr_close(void);
extern int sgr_file_present(void);
extern const struct sgrp *sgr_locate(const char *);
extern int sgr_lock(void);
extern int sgr_name(const char *);
extern const struct sgrp *sgr_next(void);
extern int sgr_open(int);
extern int sgr_remove(const char *);
extern int sgr_rewind(void);
extern int sgr_unlock(void);
extern int sgr_update(const struct sgrp *);
extern int sgr_sort(void);