tools/testing/selftests/filesystems/kernfs_test.c

// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#define __SANE_USERSPACE_TYPES__

#include <fcntl.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/xattr.h>

#include "kselftest_harness.h"
#include "wrappers.h"

TEST(kernfs_listxattr)
{
	int fd;

	/* Read-only file that can never have any extended attributes set. */
	fd = open("/sys/kernel/warn_count", O_RDONLY | O_CLOEXEC);
	ASSERT_GE(fd, 0);
	ASSERT_EQ(flistxattr(fd, NULL, 0), 0);
	EXPECT_EQ(close(fd), 0);
}

TEST(kernfs_getxattr)
{
	int fd;
	char buf[1];

	/* Read-only file that can never have any extended attributes set. */
	fd = open("/sys/kernel/warn_count", O_RDONLY | O_CLOEXEC);
	ASSERT_GE(fd, 0);
	ASSERT_LT(fgetxattr(fd, "user.foo", buf, sizeof(buf)), 0);
	ASSERT_EQ(errno, ENODATA);
	EXPECT_EQ(close(fd), 0);
}

TEST_HARNESS_MAIN