[LTP] [PATCH 1/2] syscalls/nice05: new test for nice()

[Richard Palethorpe]

Hello,

Zhao Gongyi via ltp <ltp@lists.linux.it> writes:

> Verify that user of root can decrease the nice value of
> the process successfully by passing a lower increment
> value (< min. applicable limits) to nice() system call.
>
> Signed-off-by: Zhao Gongyi <zhaogongyi@huawei.com>
> ---
>  runtest/syscalls                          |  1 +
>  testcases/kernel/syscalls/nice/.gitignore |  1 +
>  testcases/kernel/syscalls/nice/nice05.c   | 54 +++++++++++++++++++++++
>  3 files changed, 56 insertions(+)
>  create mode 100644 testcases/kernel/syscalls/nice/nice05.c
>
> diff --git a/runtest/syscalls b/runtest/syscalls
> index bd74373a4..7db399375 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -902,6 +902,7 @@ nice01 nice01
>  nice02 nice02
>  nice03 nice03
>  nice04 nice04
> +nice05 nice05

05 has already been taken. Also this test is very similar to
nice01. Maybe it could be added to that?

>
>  open01 open01
>  open01A symlink01 -T open01
> diff --git a/testcases/kernel/syscalls/nice/.gitignore b/testcases/kernel/syscalls/nice/.gitignore
> index 9d7a1bb43..58d64779e 100644
> --- a/testcases/kernel/syscalls/nice/.gitignore
> +++ b/testcases/kernel/syscalls/nice/.gitignore
> @@ -2,3 +2,4 @@
>  /nice02
>  /nice03
>  /nice04
> +/nice05
> diff --git a/testcases/kernel/syscalls/nice/nice05.c b/testcases/kernel/syscalls/nice/nice05.c
> new file mode 100644
> index 000000000..85f10fadf
> --- /dev/null
> +++ b/testcases/kernel/syscalls/nice/nice05.c
> @@ -0,0 +1,54 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright(c) 2022 Huawei Technologies Co., Ltd
> + * Author: Zhao Gongyi <zhaogongyi@huawei.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * Verify that user of root can decrease the nice value of
> + * the process successfully by passing a lower increment
> + * value (< min. applicable limits) to nice() system call.
> + */
> +#include <unistd.h>
> +#include "tst_test.h"
> +
> +#define	NICEINC -50
> +#define MIN_PRIO  -20
> +#define DEFAULT_PRIO 0
> +
> +static void verify_nice(void)
> +{
> +	int new_nice;
> +
> +	TEST(nice(NICEINC));

Why not use one of the TST_EXP* macros?

> +	if (TST_RET == -1) {
> +		tst_res(TFAIL | TTERRNO, "nice(%d) returned -1", NICEINC);
> +		return;
> +	}
> +
> +	if (TST_ERR) {
> +		tst_res(TFAIL | TTERRNO, "nice(%d) failed", NICEINC);
> +		return;
> +	}
> +
> +	new_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0);
> +
> +	if (new_nice != MIN_PRIO) {
> +		tst_res(TFAIL,
> +			"Process priority %i, expected %i", new_nice, MIN_PRIO);
> +		return;
> +	}
> +
> +	tst_res(TPASS, "nice(%d) passed", NICEINC);
> +
> +	TEST(nice(DEFAULT_PRIO));
> +	if (TST_ERR)
> +		tst_brk(TBROK | TTERRNO, "nice(%d) failed",
> DEFAULT_PRIO);

Again, could use TST_EXP* macro. Also just checking TST_ERR is not
strictly correct.

> +}
> +
> +static struct tst_test test = {
> +	.test_all = verify_nice,
> +	.needs_root = 1,
> +};
> --
> 2.17.1

-- 
Thank you,
Richard.