#define	nelem(x)	(sizeof(x)/sizeof((x)[0])) /* the rest */#include "lib.h"#include "user.h" /* * random number */extern	void	p9srand(long);extern	int	p9rand(void); extern	int	p9nrand(int);extern	long	p9lrand(void);extern	long	p9lnrand(long);extern	double	p9frand(void);extern	ulong	truerand(void);			/* uses /dev/random */extern	ulong	ntruerand(ulong);		/* uses /dev/random */ #ifndef NOPLAN9DEFINES#define	srand	p9srand#define	rand	p9rand#define	nrand	p9nrand#define	lrand	p9lrand#define	lnrand	p9lnrand#define	frand	p9frand#endif  /* * one-of-a-kind */enum{	PNPROC		= 1,	PNGROUP		= 2,}; extern	int	atexit(void(*)(void));extern	void	exits(char*);extern	int	postnote(int, int, char *);extern	vlong	strtoll(char*, char**, int);  /* *  network services */typedef struct NetConnInfo NetConnInfo;struct NetConnInfo{	char	*dir;		/* connection directory */	char	*root;		/* network root */	char	*spec;		/* binding spec */	char	*lsys;		/* local system */	char	*lserv;		/* local service */	char	*rsys;		/* remote system */	char	*rserv;		/* remote service */	char	*laddr;		/* local address */	char	*raddr;		/* remote address */};extern	NetConnInfo*	getnetconninfo(char*, int);extern	void		freenetconninfo(NetConnInfo*); /* * system calls * */#define	STATMAX	65535U	/* max length of machine-independent stat structure */#define	DIRMAX	(sizeof(Dir)+STATMAX)	/* max length of Dir structure */#define	ERRMAX	128	/* max length of error string */   extern	Dir*	dirstat(char*);extern	Dir*	dirfstat(int);extern	int	dirwstat(char*, Dir*);extern	int	dirfwstat(int, Dir*);extern	long	dirread(int, Dir**);extern	void	nulldir(Dir*);extern	long	dirreadall(int, Dir**);extern	int	getpid(void);extern	int	getppid(void);extern	void	rerrstr(char*, uint);extern	void	werrstr(char*, ...);