nsd_options_create
options = nsd_options_create(region_create(xalloc, free));
nsd.options = nsd_options_create(region_create_custom(xalloc, free,
if(!(opt = nsd_options_create(region_create(xalloc, free)))) {
nsd.options = nsd_options_create(region_create_custom(xalloc, free,
nsd.options = nsd_options_create(region_create_custom(xalloc, free,
struct nsd_options* nsd_options_create(region_type* region);
opt = nsd_options_create(region);
options = nsd_options_create(region);