tools/testing/selftests/filesystems/kernfs_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/filesystems/kernfs_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/filesystems/kernfs_test.c
Extension
.c
Size
816 bytes
Lines
39
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

// 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

Annotation

Implementation Notes