#include <u.h>#include <libc.h>#include <bio.h>#include <auth.h> char	*dest = "system";int	mountflag = MREPL; void	error(char *);void	rpc(int, int);void	post(char*, int);void	mountfs(char*, int); voidusage(void){	fprint(2, "usage: %s [-abcCm] [net!]host [srvname [mtpt]]\n", argv0);		exits("usage");} voidignore(void *a, char *c){	USED(a);	if(strcmp(c, "alarm") == 0){		fprint(2, "srv: timeout establishing connection to %s\n", dest);		exits("timeout");	}	noted(NDFLT);} voidmain(int argc, char *argv[]){	int fd;	char srv[64], mtpt[64];	char dir[1024];	char err[ERRMAX];	char *p, *p2;	int domount, reallymount, try; 	notify(ignore); 	domount = 0;	reallymount = 0; 	ARGBEGIN{	case 'a':		mountflag |= MAFTER;		domount = 1;		reallymount = 1;		break;	case 'b':		mountflag |= MBEFORE;		domount = 1;		reallymount = 1;		break;	case 'c':		mountflag |= MCREATE;		domount = 1;		reallymount = 1;		break;	case 'C':		mountflag |= MCACHE;		domount = 1;		reallymount = 1;		break;	case 'm':		domount = 1;		reallymount = 1;		break;	case 'q':		domount = 1;		reallymount = 0;		break;	case 'r':		/* deprecated -r flag; ignored for compatibility */		break;	default:		usage();		break;	}ARGEND 	if((mountflag&MAFTER)&&(mountflag&MBEFORE))		usage(); 	switch(argc){	case 1:	/* calculate srv and mtpt from address */		p = strrchr(argv[0], '/');		p = p ? p+1 : argv[0];		snprint(srv, sizeof(srv), "/srv/%.28s", p);		p2 = strchr(p, '!');		p2 = p2 ? p2+1 : p;		snprint(mtpt, sizeof(mtpt), "/n/%.28s", p2);		break;	case 2:	/* calculate mtpt from address, srv given */		snprint(srv, sizeof(srv), "/srv/%.28s", argv[1]);		p = strrchr(argv[0], '/');		p = p ? p+1 : argv[0];		p2 = strchr(p, '!');		p2 = p2 ? p2+1 : p;		snprint(mtpt, sizeof(mtpt), "/n/%.28s", p2);		break;	case 3:	/* srv and mtpt given */		domount = 1;		reallymount = 1;		snprint(srv, sizeof(srv), "/srv/%.28s", argv[1]);		snprint(mtpt, sizeof(mtpt), "%.28s", argv[2]);		break;	default:		usage();	} 	try = 0;	dest = *argv;Again:	try++; 	if(access(srv, 0) == 0){		if(domount){			fd = open(srv, ORDWR);			if(fd >= 0)				goto Mount;			remove(srv);		}		else{			fprint(2, "srv: %s already exists\n", srv);			exits(0);		}	} 	alarm(10000);	dest = netmkaddr(dest, 0, "9fs");	fd = dial(dest, 0, dir, 0);	if(fd < 0) {		fprint(2, "srv: dial %s: %r\n", dest);		exits("dial");	}	alarm(0); 	post(srv, fd); Mount:	if(domount == 0 || reallymount == 0)		exits(0); 	if(amount(fd, mtpt, mountflag, "") < 0){		err[0] = 0;		errstr(err, sizeof err);		if(strstr(err, "hungup") || strstr(err, "timed out")){			remove(srv);			if(try == 1)				goto Again;		}		fprint(2, "srv %s: mount failed: %s\n", dest, err);		exits("mount");	}	exits(0);} voidpost(char *srv, int fd){	int f;	char buf[128]; 	fprint(2, "post...\n");	f = create(srv, OWRITE, 0666);	if(f < 0){		sprint(buf, "create(%s)", srv);		error(buf);	}	sprint(buf, "%d", fd);	if(write(f, buf, strlen(buf)) != strlen(buf))		error("write");} voiderror(char *s){	fprint(2, "srv %s: %s: %r\n", dest, s);	exits("srv: error");}