lua_getfield(L, index, HOST_FIELDNAME);
sg_host_t *pi = (sg_host_t *) luaL_checkudata(L, lua_gettop(L), HOST_MODULE_NAME);
lua_pop(L, 1);
lua_getfield(L, index, HOST_FIELDNAME);
sg_host_t *pi = (sg_host_t *) luaL_checkudata(L, lua_gettop(L), HOST_MODULE_NAME);
lua_pop(L, 1);