ns_flag
void ns_newmsg_flag(ns_newmsg *handle, ns_flag flag, u_int value);
namei_simple_flags_t ns_flag;
ns_flag = NSM_NOFOLLOW_TRYEMULROOT;
ns_flag = NSM_FOLLOW_TRYEMULROOT;
error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp);
namei_simple_flags_t ns_flag;
ns_flag = NSM_NOFOLLOW_TRYEMULROOT;
ns_flag = NSM_FOLLOW_TRYEMULROOT;
error = fd_nameiat_simple_user(l, fdat, path, ns_flag, &vp);