sendto_variant
ret = sendto_variant(connect_fd, NULL, NULL, 0, MSG_FASTOPEN);
ret = sendto_variant(connect_fd, &self->srv0, "A", 1,
res = sendto_variant(client_fd, NULL, "A", 1, 0);
EXPECT_EQ(0, sendto_variant(client_fd, NULL, "C", 1, 0));
res = sendto_variant(client_fd, &self->srv1, "E", 1, 0);
res = sendto_variant(client_fd, &self->unspec_srv0, "B", 1, 0);
res = sendto_variant(client_fd, &self->unspec_srv1, "C", 1, 0);
EXPECT_EQ(-EACCES, sendto_variant(sock_fd, &self->srv0, "A", 1, 0));
EXPECT_EQ(-EACCES, sendto_variant(sock_fd, &self->srv1, "A", 1, 0));
sendto_variant(sock_fd, &self->unspec_srv0, "B", 1, 0));
ret = sendto_variant(client_fd, srv, "B", 1, 0);