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typedef struct Rock Rock;
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enum
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{
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	Ctlsize=	128,
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	/* states */
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	Sopen=	0,
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	Sbound,
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	Sconnected,
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	/* types of name */
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	Tsys=	0,
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	Tip,
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	Tdom,
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};
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/*
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 *  since BSD programs expect to perform both control and data functions
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 *  through a single fd, we need to hide enough info under a rock to
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 *  be able to open the control file when we need it.
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 */
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struct Rock
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{
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	Rock		*next;
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	unsigned long	dev;		/* inode & dev of data file */
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	unsigned long	inode;		/* ... */
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	int		domain;		/* from socket call */
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	int		stype;		/* ... */
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	int		protocol;	/* ... */
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	struct sockaddr	addr;		/* address from bind */
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	int		reserved;	/* use a priveledged port # (< 1024) */
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	struct sockaddr	raddr;		/* peer address */
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	char		ctl[Ctlsize];	/* name of control file (if any) */
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	int		other;		/* fd of the remote end for Unix domain */
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};
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extern Rock*	_sock_findrock(int, struct stat*);
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extern Rock*	_sock_newrock(int);
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extern void	_sock_srvname(char*, char*);
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extern int	_sock_srv(char*, int);
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extern int	_sock_data(int, char*, int, int, int, Rock**);
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extern int	_sock_ipattr(char*);
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extern void	_sock_ingetaddr(Rock*, struct sockaddr_in*, int*, char*);
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extern void	_syserrno(void);