[LTP] [PATCH v4] Add stat04 test

[Petr Vorel]

> From: Andrea Cervesato <andrea.cervesato@suse.com>

> This test has been extracted from symlink01 test and it checks that
> stat() executed on file provide the same information of symlink linking
> to it.

> Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
> ---
> free() tmpdir
> rename link_stat into link
> rename path_stat into path

>  runtest/smoketest                         |  2 +-
>  runtest/syscalls                          |  4 +-
>  testcases/kernel/syscalls/stat/.gitignore |  2 +
>  testcases/kernel/syscalls/stat/stat04.c   | 50 +++++++++++++++++++++++
>  4 files changed, 55 insertions(+), 3 deletions(-)
>  create mode 100644 testcases/kernel/syscalls/stat/stat04.c

> diff --git a/runtest/smoketest b/runtest/smoketest
> index 83eebfe7b..5608417f9 100644
> --- a/runtest/smoketest
> +++ b/runtest/smoketest
> @@ -8,7 +8,7 @@ time01 time01
>  wait02 wait02
>  write01 write01
>  symlink01 symlink01
> -stat04 symlink01 -T stat04
> +stat04 stat04
>  utime01A symlink01 -T utime01
>  rename01A symlink01 -T rename01
>  splice02 splice02 -s 20
> diff --git a/runtest/syscalls b/runtest/syscalls
> index 7794f1465..ef90076e4 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -1529,8 +1529,8 @@ stat02 stat02
>  stat02_64 stat02_64
>  stat03 stat03
>  stat03_64 stat03_64
> -stat04 symlink01 -T stat04
> -stat04_64 symlink01 -T stat04_64
> +stat04 stat04
> +stat04_64 stat04_64

>  statfs01 statfs01
>  statfs01_64 statfs01_64
> diff --git a/testcases/kernel/syscalls/stat/.gitignore b/testcases/kernel/syscalls/stat/.gitignore
> index fa0a4ce9f..0a62dc6ee 100644
> --- a/testcases/kernel/syscalls/stat/.gitignore
> +++ b/testcases/kernel/syscalls/stat/.gitignore
> @@ -4,3 +4,5 @@
>  /stat02_64
>  /stat03
>  /stat03_64
> +/stat04
> +/stat04_64
> diff --git a/testcases/kernel/syscalls/stat/stat04.c b/testcases/kernel/syscalls/stat/stat04.c
> new file mode 100644
> index 000000000..aebfacf5a
> --- /dev/null
> +++ b/testcases/kernel/syscalls/stat/stat04.c
> @@ -0,0 +1,50 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
> + *    Author: David Fenner
> + *    Copilot: Jon Hendrickson
very nit:
 * Author: David Fenner, Jon Hendrickson

> + * Copyright (C) 2024 Andrea Cervesato <andrea.cervesato@suse.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * This test checks that stat() executed on file provide the same information
> + * of symlink linking to it.
> + */
> +
> +#include <stdlib.h>
> +#include "tst_test.h"
> +
> +static void run(void)
> +{
> +	char *symname = "my_symlink0";
> +	char *tmpdir = tst_get_tmpdir();
> +
> +	SAFE_SYMLINK(tmpdir, symname);
> +
> +	struct stat path;
> +	struct stat link;
nit: maybe define struct at the top of the function?
> +
> +	TST_EXP_PASS(stat(tmpdir, &path));
> +	free(tmpdir);
If SAFE_SYMLINK() fails, free() will not happen. I wonder if we should bother
(we'd have to set it NULL and add a cleanup function).

Reviewed-by: Petr Vorel <pvorel@suse.cz>

Kind regards,
Petr

> +
> +	TST_EXP_PASS(stat(symname, &link));
> +
> +	TST_EXP_EQ_LI(path.st_dev, link.st_dev);
> +	TST_EXP_EQ_LI(path.st_mode, link.st_mode);
> +	TST_EXP_EQ_LI(path.st_nlink, link.st_nlink);
> +	TST_EXP_EQ_LI(path.st_uid, link.st_uid);
> +	TST_EXP_EQ_LI(path.st_gid, link.st_gid);
> +	TST_EXP_EQ_LI(path.st_size, link.st_size);
> +	TST_EXP_EQ_LI(path.st_atime, link.st_atime);
> +	TST_EXP_EQ_LI(path.st_mtime, link.st_mtime);
> +	TST_EXP_EQ_LI(path.st_ctime, link.st_ctime);
> +
> +	SAFE_UNLINK(symname);
> +}
> +
> +static struct tst_test test = {
> +	.test_all = run,
> +	.needs_tmpdir = 1,
> +};