linux-kernel - Re: [PATCH] tools: msgque improve error handling when not running as root

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Message-id: <53AB31C3.1080309@samsung.com>
Date:	Wed, 25 Jun 2014 14:32:03 -0600
From:	Shuah Khan <shuah.kh@...sung.com>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	gregkh@...uxfoundation.org, akpm@...ux-foundation.org,
	colin.king@...onical.com, linux-kernel@...r.kernel.org,
	Shuah Khan <shuah.kh@...sung.com>
Subject: Re: [PATCH] tools: msgque improve error handling when not running as
 root

On 06/25/2014 02:22 PM, Davidlohr Bueso wrote:
> On Wed, 2014-06-25 at 14:15 -0600, Shuah Khan wrote:
>> On 06/25/2014 02:05 PM, Davidlohr Bueso wrote:
>>> On Wed, 2014-06-25 at 13:40 -0600, Shuah Khan wrote:
>>>> The test fails in the middle when it is not run as root while
>>>> accessing /proc/sys/kernel/msg_next_id. Changed it to check
>>>> for root at the beginning of the test. Also added messages
>>>> to indicate start and test pass status.
>>>>
>>>> Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
>>>> ---
>>>>    tools/testing/selftests/ipc/msgque.c | 7 +++++++
>>>>    1 file changed, 7 insertions(+)
>>>>
>>>> diff --git a/tools/testing/selftests/ipc/msgque.c b/tools/testing/selftests/ipc/msgque.c
>>>> index aa290c0..30c627a 100644
>>>> --- a/tools/testing/selftests/ipc/msgque.c
>>>> +++ b/tools/testing/selftests/ipc/msgque.c
>>>> @@ -193,6 +193,12 @@ int main(int argc, char **argv)
>>>>    	int msg, pid, err;
>>>>    	struct msgque_data msgque;
>>>>
>>>> +	if (getuid() != 0) {
>>>> +		fprintf(stderr, "Please run the test as root - Exiting.\n");
>>>> +		exit(1);
>>>> +	}
>>>
>>> Please use err(3).
>>
>> I will make this printf to be consistent with the rest of the
>> printfs in this file.
>
> Can you please update the file then. err(EXIT_FAILURE, ...) is a lot
> nicer than fprintf+exit combos all over the place.

That would make sense as a separate patch and not as part of fix for
this problem.

>
>>
>>>
>>>> +	printf("Starting ipc tests:\n");
>>>
>>> This is unnecessary and adds nothing to the program.
>>
>> The reason for doing this is it becomes easier to parse when this test
>> is run as part of run_tests at the top level:
>
> Parsing reasons should not determine such things. What if I add shm, or
> semaphore tests to the ipc dir?? Then the text would be bogus. What if
> not all tests pass? There is no way of determining a percentage of
> completeness. Please do not add such things for a simple msg queue
> program as it doesn't necessarily represent ipc selftests.
>

I can drop these messages. However, I do think it would make sense
to add a summary of tests passed. Similar to what mqueue does for
example.

-- Shuah

-- 
Shuah Khan
Senior Linux Kernel Developer - Open Source Group
Samsung Research America(Silicon Valley)
shuah.kh@...sung.com | (970) 672-0658
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