NG_HOOK_SET_RCVDATA
#define NG_HOOK_SET_RCVDATA(hook, val) do {(hook)->rcvdata = val;} while (0)
#define NG_HOOK_SET_RCVDATA(hook, val) _ng_hook_set_rcvdata(hook, val, _NN_)
#define NG_HOOK_SET_RCVDATA(hook, val) _NG_HOOK_SET_RCVDATA(hook, val)