#include	"u.h"#include	"lib.h"#include	"dat.h"#include	"fns.h"#include	"error.h"  voidcinit(void){} voidcopen(Chan *c){	USED(c);} intcread(Chan *c, uchar *buf, int len, vlong off){	USED(c);	USED(buf);	USED(len);	USED(off); 	return 0;} voidcupdate(Chan *c, uchar *buf, int len, vlong off){	USED(c);	USED(buf);	USED(len);	USED(off);} voidcwrite(Chan* c, uchar *buf, int len, vlong off){	USED(c);	USED(buf);	USED(len);	USED(off);}