SO_ERROR          765 net/core/sock.c 	case SO_ERROR:
SO_ERROR         1286 net/core/sock.c 	case SO_ERROR:
SO_ERROR         1271 tools/testing/selftests/net/nettest.c 	if (getsockopt(sd, SOL_SOCKET, SO_ERROR, &val, (socklen_t *)&sz) < 0) {