#include <u.h>#include <libc.h>#include <fcall.h>#include <auth.h> int	connect(char*, char*);void	error(int, char*, ...);void	usage(void); voidmain(int argc, char **argv){	char *mntpt;	int fd, mntflags;	char *srv; 	srv = "";	mntflags = MREPL;	ARGBEGIN{	case 'a':		mntflags = MAFTER;		break;	case 'b':		mntflags = MBEFORE;		break;	case 'c':		mntflags |= MCREATE;		break;	case 't':		srv = "any";		break;	case 's':		srv = ARGF();		if(srv == 0)			usage();		break;	default:		usage();	}ARGEND; 	switch(argc) {	case 2:		mntpt = argv[1];		break;	case 3:		mntpt = argv[2];		break;			default:		mntpt = 0;		/* to shut up compiler */		usage();	} 	fd = connect(argv[0], argv[1]);	if(mount(fd, mntpt, mntflags, "", srv) < 0)		error(1, "can't mount %s", argv[1]);	exits(0);} intconnect(char *system, char *tree){	char buf[ERRLEN], *na, *err;	int fd, n; 	na = netmkaddr(system, 0, "exportfs");	if((fd = dial(na, 0, 0, 0)) < 0)		error(1, "can't dial %s", system); 	if(err = auth(fd, na))		error(1, "%s: %s", err, system); 	n = write(fd, tree, strlen(tree));	if(n < 0)		error(1, "can't write tree"); 	strcpy(buf, "can't read tree"); 	n = read(fd, buf, sizeof buf - 1);	if(n!=2 || buf[0]!='O' || buf[1]!='K'){		buf[sizeof buf - 1] = '\0';		error(0, "bad remote tree: %s\n", buf);	}	return fd;} voiderror(int syserr, char *fmt, ...){	char msg[256]; 	doprint(msg, msg+sizeof(msg), fmt, (&fmt+1));	if(syserr)		fprint(2, "import: %s: %r\n", msg);	else		fprint(2, "import: %s\n", msg);	exits(msg);} voidusage(void){	print("Usage: import [-abc] [-t|-s server] host remotefs [mountpoint]\n");	exits("usage");}