selftests/bpf: add auto-detach test

	return rc;

}

static int test_autodetach(void)

{

	__u32 prog_cnt = 4, attach_flags;

	int allow_prog[2] = {0};

	__u32 prog_ids[2] = {0};

	int cg = 0, i, rc = -1;

	void *ptr = NULL;

	int attempts;

	for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {

		allow_prog[i] = prog_load_cnt(1, 1 << i);

		if (!allow_prog[i])

			goto err;

	}

	if (setup_cgroup_environment())

		goto err;

	/* create a cgroup, attach two programs and remember their ids */

	cg = create_and_get_cgroup("/cg_autodetach");

	if (cg < 0)

		goto err;

	if (join_cgroup("/cg_autodetach"))

		goto err;

	for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {

		if (bpf_prog_attach(allow_prog[i], cg, BPF_CGROUP_INET_EGRESS,

				    BPF_F_ALLOW_MULTI)) {

			log_err("Attaching prog[%d] to cg:egress", i);

			goto err;

		}

	}

	/* make sure that programs are attached and run some traffic */

	assert(bpf_prog_query(cg, BPF_CGROUP_INET_EGRESS, 0, &attach_flags,

			      prog_ids, &prog_cnt) == 0);

	assert(system(PING_CMD) == 0);

	/* allocate some memory (4Mb) to pin the original cgroup */

	ptr = malloc(4 * (1 << 20));

	if (!ptr)

		goto err;

	/* close programs and cgroup fd */

	for (i = 0; i < ARRAY_SIZE(allow_prog); i++) {

		close(allow_prog[i]);

		allow_prog[i] = 0;

	}

	close(cg);

	cg = 0;

	/* leave the cgroup and remove it. don't detach programs */

	cleanup_cgroup_environment();

	/* wait for the asynchronous auto-detachment.

	 * wait for no more than 5 sec and give up.

	 */

	for (i = 0; i < ARRAY_SIZE(prog_ids); i++) {

		for (attempts = 5; attempts >= 0; attempts--) {

			int fd = bpf_prog_get_fd_by_id(prog_ids[i]);

			if (fd < 0)

				break;

			/* don't leave the fd open */

			close(fd);

			if (!attempts)

				goto err;

			sleep(1);

		}

	}

	rc = 0;

err:

	for (i = 0; i < ARRAY_SIZE(allow_prog); i++)

		if (allow_prog[i] > 0)

			close(allow_prog[i]);

	if (cg)

		close(cg);

	free(ptr);

	cleanup_cgroup_environment();

	if (!rc)

		printf("#autodetach:PASS\n");

	else

		printf("#autodetach:FAIL\n");

	return rc;

}

int main(void)

{

	int (*tests[])(void) = {test_foo_bar, test_multiprog};

	int (*tests[])(void) = {

		test_foo_bar,

		test_multiprog,

		test_autodetach,

	};

	int errors = 0;

	int i;