KFILTER_BYNAME
IOCTL_STRUCT_CONV_TO(KFILTER_BYNAME, kfilter_mapping);
case KFILTER_BYNAME: /* convert name -> filter */
RL(ioctl(kq, KFILTER_BYNAME, &km));
ATF_REQUIRE_EQ(ioctl(kq, KFILTER_BYNAME, &km), -1);
RL(ioctl(kq, KFILTER_BYNAME, &km));