[LTP] Add new test for pipe2 with/without O_NONBLOCK mode

[Li Wang]

Hi Xu,

Thanks for reviewing the patches.

Yang Xu <xuyang2018.jy@cn.fujitsu.com> wrote:

> ...
> > I modify your patch and merged into my ltp own fork.
> > see
> >
> https://github.com/xuyang0410/ltp/commits/Laniel_francis_pipe2_03_v3.fixes
> >
> > ps: I will convert pipe2_01/02.c into new libray and use SAFE_PIPE2
> macro.
> Can you merge the safe_pipe2 patch(don't need to add this macro into old
> safe_macro header) into master? so then I can write new test cases
>

I'm ok with only support it in the new library.

But if we export the safe macro only to use by new API, we'd better add it
into lib/tst_safe_macros.c
but not lib/safe_macros.c, this patch leaves the 'void (*cleanup_fn)
(void)' hook in function safe_pipe2()
and put in safe_macros.c that is compatible with both API using.

Do you think so? if yes I can help to move it to tst_safe_macros.c and
apply it.

-- 
Regards,
Li Wang
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