bsd/kern/uipc_syscalls.c

2064 	struct user_sf_hdtr user_hdtr;
2155 		bzero(&user_hdtr, sizeof (user_hdtr));
2167 			user_hdtr.headers = user64_hdtr.headers;
2168 			user_hdtr.hdr_cnt = user64_hdtr.hdr_cnt;
2169 			user_hdtr.trailers = user64_hdtr.trailers;
2170 			user_hdtr.trl_cnt = user64_hdtr.trl_cnt;
2172 			user_hdtr.headers = user32_hdtr.headers;
2173 			user_hdtr.hdr_cnt = user32_hdtr.hdr_cnt;
2174 			user_hdtr.trailers = user32_hdtr.trailers;
2175 			user_hdtr.trl_cnt = user32_hdtr.trl_cnt;
2181 		if (user_hdtr.headers != USER_ADDR_NULL) {
2184 			nuap.iovp = user_hdtr.headers;
2185 			nuap.iovcnt = user_hdtr.hdr_cnt;
2431 	    user_hdtr.trailers != USER_ADDR_NULL) {
2434 		nuap.iovp = user_hdtr.trailers;
2435 		nuap.iovcnt = user_hdtr.trl_cnt;