tools/testing/selftests/namespaces/listns_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/namespaces/listns_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/namespaces/listns_test.c
Extension
.c
Size
15034 bytes
Lines
680
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (fd >= 0) {
			int ns_type;
			/* Verify it's a network namespace via ioctl */
			ns_type = ioctl(fd, NS_GET_NSTYPE);
			if (ns_type >= 0) {
				ASSERT_EQ(ns_type, CLONE_NEWNET);
			}
			close(fd);
		}
	}
}

/*
 * Test listns() pagination.
 * List namespaces in batches.
 */
TEST(listns_pagination)
{
	struct ns_id_req req = {
		.size = sizeof(req),
		.spare = 0,
		.ns_id = 0,
		.ns_type = 0,
		.spare2 = 0,
		.user_ns_id = 0,
	};
	__u64 batch1[2], batch2[2];
	ssize_t ret1, ret2;

	/* Get first batch */
	ret1 = sys_listns(&req, batch1, ARRAY_SIZE(batch1), 0);
	if (ret1 < 0) {
		if (errno == ENOSYS)
			SKIP(return, "listns() not supported");
		TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno);
		ASSERT_TRUE(false);
	}
	ASSERT_GE(ret1, 0);

	if (ret1 == 0)
		SKIP(return, "No namespaces found");

	TH_LOG("First batch: %zd namespaces", ret1);

	/* Get second batch using last ID from first batch */
	if (ret1 == ARRAY_SIZE(batch1)) {
		req.ns_id = batch1[ret1 - 1];
		ret2 = sys_listns(&req, batch2, ARRAY_SIZE(batch2), 0);
		ASSERT_GE(ret2, 0);

		TH_LOG("Second batch: %zd namespaces (after ns_id=%llu)",
		       ret2, (unsigned long long)req.ns_id);

		/* If we got more results, verify IDs are monotonically increasing */
		if (ret2 > 0) {
			ASSERT_GT(batch2[0], batch1[ret1 - 1]);
			TH_LOG("Pagination working: %llu > %llu",
			       (unsigned long long)batch2[0],
			       (unsigned long long)batch1[ret1 - 1]);
		}
	} else {
		TH_LOG("All namespaces fit in first batch");
	}
}

/*
 * Test listns() with LISTNS_CURRENT_USER.
 * List namespaces owned by current user namespace.
 */
TEST(listns_current_user)
{
	struct ns_id_req req = {
		.size = sizeof(req),
		.spare = 0,
		.ns_id = 0,
		.ns_type = 0,
		.spare2 = 0,
		.user_ns_id = LISTNS_CURRENT_USER,
	};
	__u64 ns_ids[100];
	ssize_t ret;

	ret = sys_listns(&req, ns_ids, ARRAY_SIZE(ns_ids), 0);
	if (ret < 0) {
		if (errno == ENOSYS)
			SKIP(return, "listns() not supported");
		TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno);
		ASSERT_TRUE(false);
	}
	ASSERT_GE(ret, 0);

Annotation

Implementation Notes