extern	int	kclose(int);extern	int	kdial(char*, char*, char*, int*);extern	int	kannounce(char*, char*);extern	void	kerrstr(char*);extern	void	kgerrstr(char*);extern	int	kopen(char*, int);extern	long	kread(int, void*, long);extern	long	kseek(int, vlong, int);extern	long	kwrite(int, void*, long);extern	void	kwerrstr(char *, ...);