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

[Petr Vorel <pvorel@suse.cz>]

> 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.

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