[LTP] [PATCH] shmget03: fix test when some shm segments already exist

[Alexey Kodanev]

On 12.07.2021 11:41, Petr Vorel wrote:
>> On 12.07.2021 05:31, xuyang2018.jy@fujitsu.com wrote:
>>> Hi All
>>>> Hi!
>>>>>>> Yes, good point, that would be more precise for ENOSPC testing.
>>>>>> AFAIK, ltp doesn't support parallel test now. I think parallel test
>>>>>> maybe a future plan that is why we use docparase to collect each case's
>>>>>> used resources(so we can convert many groups, like pid, memory, disk
>>>>>> space..., then we can run pid group and memory groups test case parallelly).
>>>>> Yes, parallel support is not supported atm. Richie and Cyril has done some work
>>>>> on runltp-ng to support it. Yes, first it's needed to add support in resources
>>>>> (docparse), see Cyril's old block post [1].
> 
>>>> Besides most of the SHM tests will crash and burn if executed in
>>>> parallel. The SysV IPC shares a global namespace and because of that we
>>>> can't really write tests without assuming that we are the only one
>>>> manipulating them when the test is executed.
>>> I guess we should reach a consensus that how to fix this problem
>>> 1)use for loop to trigger this error
>>> 2)use CLONE_NEWIPC to trigger this error
> 
>> Perhaps it can be done at the higher level, e.g. in the ltp tests
>> runner if some tests request it with a newipc flag...
> Well, we have at least two runners (runltp which uses ltp-pan, runltp-ng) and we
> also support running tests without runner, it'd be nice to solve this in LTP
> API.

I didn't mean these runners, I was thinking about fork_testrun() in tst_test.c.

> 
> Kind regards,
> Petr
> 
>>> 3)Or we are the only one that use shm and we can add a api to count the 
>>> existed_cnt
> 
>>> ps: I don't want to leave this problem too long time.
> 
>>> Best Regards
>>> Yang Xu
> 
>