#include <u.h>#include <libc.h>#include <auth.h> void	usage(void);void	catch(void*, char*); voidmain(int argc, char *argv[]){	char *spec;	ulong flag = 0;	int qflag = 0;	int fd; 	ARGBEGIN{	case 'a':		flag |= MAFTER;		break;	case 'b':		flag |= MBEFORE;		break;	case 'c':		flag |= MCREATE;		break;	case 'C':		flag |= MCACHE;		break;	case 'q':		qflag = 1;		break;	default:		usage();	}ARGEND 	spec = 0;	if(argc == 2)		spec = "";	else if(argc == 3)		spec = argv[2];	else		usage(); 	if((flag&MAFTER)&&(flag&MBEFORE))		usage(); 	fd = open(argv[0], ORDWR);	if(fd < 0){		if(qflag)			exits(0);		fprint(2, "%s: can't open %s: %r\n", argv0, argv[0]);		exits("open");	} 	notify(catch);	if(amount(fd, argv[1], flag, spec) < 0){		if(qflag)			exits(0);		fprint(2, "%s: mount %s: %r\n", argv0, argv[1]);		exits("mount");	}	exits(0);} voidcatch(void *x, char *m){	USED(x);	fprint(2, "mount: %s\n", m);	exits(m);} voidusage(void){	fprint(2, "usage: mount [-a|-b] [-c] [-r] /srv/service dir [spec]\n");	exits("usage");}