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70619d40e8
Make sure that listxattr() returns zero and that getxattr() returns ENODATA when no extended attributs are set. Use /sys/kernel/warn_count as that always exists and is a read-only file. Link: https://lore.kernel.org/20250702-hochmoderne-abklatsch-af9c605b57b2@brauner Signed-off-by: Christian Brauner <brauner@kernel.org>
38 lines
819 B
C
38 lines
819 B
C
// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#define __SANE_USERSPACE_TYPES__
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/xattr.h>
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#include "../kselftest_harness.h"
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#include "wrappers.h"
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TEST(kernfs_listxattr)
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{
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int fd;
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/* Read-only file that can never have any extended attributes set. */
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fd = open("/sys/kernel/warn_count", O_RDONLY | O_CLOEXEC);
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ASSERT_GE(fd, 0);
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ASSERT_EQ(flistxattr(fd, NULL, 0), 0);
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EXPECT_EQ(close(fd), 0);
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}
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TEST(kernfs_getxattr)
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{
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int fd;
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char buf[1];
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/* Read-only file that can never have any extended attributes set. */
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fd = open("/sys/kernel/warn_count", O_RDONLY | O_CLOEXEC);
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ASSERT_GE(fd, 0);
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ASSERT_LT(fgetxattr(fd, "user.foo", buf, sizeof(buf)), 0);
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ASSERT_EQ(errno, ENODATA);
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EXPECT_EQ(close(fd), 0);
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}
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TEST_HARNESS_MAIN
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