SCARG_COMPAT_PTR
if (SCARG_COMPAT_PTR(uap, nss)) { \
error = copyin(SCARG_COMPAT_PTR(uap, nss), &css, sizeof css); \
error = sigaltstack1(curlwp, SCARG_COMPAT_PTR(uap, nss) ? &nss : 0, \
SCARG_COMPAT_PTR(uap, oss) ? &oss : 0); \
if (SCARG_COMPAT_PTR(uap, oss)) { \
error = copyout(&css, SCARG_COMPAT_PTR(uap, oss), sizeof(css));\