can't understand this function definition# Programming - 葵花宝典
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the gdbm package,
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extern GDBM_FILE gdbm_open __P((char *, int, int, int, void (*)()));
extern void gdbm_close __P((GDBM_FILE));
extern int gdbm_store __P((GDBM_FILE, datum, datum, int));
extern datum gdbm_fetch __P((GDBM_FILE, datum));
extern int gdbm_delete __P((GDBM_FILE, datum));
extern datum gdbm_firstkey __P((GDBM_FILE));
extern datum gdbm_nextkey __P((GDBM_FILE, datum));
extern int gdbm_reorganize __P((GDBM_FILE));
extern void gdbm_sync __P((GDBM_FILE));
extern int gdbm_
look into
extern GDBM_FILE gdbm_open __P((char *, int, int, int, void (*)()));
extern void gdbm_close __P((GDBM_FILE));
extern int gdbm_store __P((GDBM_FILE, datum, datum, int));
extern datum gdbm_fetch __P((GDBM_FILE, datum));
extern int gdbm_delete __P((GDBM_FILE, datum));
extern datum gdbm_firstkey __P((GDBM_FILE));
extern datum gdbm_nextkey __P((GDBM_FILE, datum));
extern int gdbm_reorganize __P((GDBM_FILE));
extern void gdbm_sync __P((GDBM_FILE));
extern int gdbm_