#ifdef __STDC__#define ARGS(x) x#else#define ARGS(x) ()#endif/* mallocs.c */extern char *mymalloc();extern char *myrealloc();extern char *dupstr();/* find_addr.c */extern struct in_addr find_addr();extern int find_port();/* error.c */extern void remark ARGS((char *,...));extern void error ARGS((char *,...));extern void panic ARGS((char *,...));extern char *progname;/* print_data.c */extern void print_data();/* ring.c */typedef struct RING {    struct RING *succ;                 /* successor */    struct RING *pred;                 /* predecessor */} RING;extern void ring_init ARGS((RING *));extern void ring_prepend ARGS((RING *, RING *));extern void ring_append ARGS((RING *, RING *));extern void ring_detach ARGS((RING *));#define ring_succ(c) ((c)->succ)#define ring_pred(c) ((c)->pred)