239 	int nullfd;  local
292 		(void) close(nullfd = open("/", O_RDONLY));
294 			(void) close(nullfd);
314 			(void) close(nullfd);
734 	int dcr, dcr2, nullfd, ret;  local
760 	(void) close(nullfd = open("/", O_RDONLY));
764 		(void) close(nullfd);
779 		(void) close(nullfd);	/* kernel might think dc2 is open */
850 	int nw, lt, dcf = -1, nullfd, dnf = -1;  local
861 	(void) close(nullfd = open("/dev/null", O_RDONLY));/* partial open hack */
864 		(void) close(nullfd);
925 	int nw, lt, dcf = -1, nullfd, dnf = -1, ret;  local
928 	(void) close(nullfd = open("/", O_RDONLY));	/* partial open hack */
933 		(void) close(nullfd);
978 	(void) close(nullfd = open("/", O_RDONLY));	/* partial open hack */
985 		(void) close(nullfd);		/* close partially opened modem */