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

[Shuah Khan]

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@xxxxxxxxxxx>
> > > > ---
> > > >    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@xxxxxxxxxxx | (970) 672-0658
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