NLMSGINFO_ATTR_PROCESS_ID
.nla.nla_type = NLMSGINFO_ATTR_PROCESS_ID,
{ .type = NLMSGINFO_ATTR_PROCESS_ID, .off = _OUT(process_id), .cb = snl_attr_get_uint32 },
ATF_REQUIRE(nlc[0].nla.nla_type == NLMSGINFO_ATTR_PROCESS_ID);