/* * tee-- pipe fitting */ #include <u.h>#include <libc.h> int	uflag;int	aflag;int	openf[100]; char in[8192]; int	intignore(void*, char*); voidmain(int argc, char **argv){	int i, j;	int r, n; 	ARGBEGIN {	case 'a':		aflag++;		break; 	case 'i':		atnotify(intignore, 1);		break; 	case 'u':		uflag++;		break;	ARGEND } 	USED(argc);	n = 0;	while(*argv) {		if(aflag) {			openf[n] = open(argv[0], OWRITE);			if(openf[n] < 0)				openf[n] = create(argv[0], OWRITE, 0666);			seek(openf[n], 0L, 2);		} else			openf[n] = create(argv[0], OWRITE, 0666);		if(openf[n] < 0) {			fprint(2, "tee: cannot open %s: ", argv[0]);			perror("");		} else			n++;		argv++;	}	openf[n++] = 1; 	for(;;) {		r = read(0, in, sizeof in);		if(r <= 0)			exits(0);		if(uflag) {			for(j=0; j<r; j++)			for(i=0; i<n; i++)				write(openf[i], &in[j], 1);		} else		for(i=0; i<n; i++)			write(openf[i], in, r);	}} intintignore(void *a, char *msg){	USED(a);	if(strcmp(msg, "interrupt") == 0)		return 1;	return 0;}