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

[Yang Xu]

Hi Li


> Hi Xu,
> 
> Thanks for reviewing the patches.
> 
> Yang Xu <xuyang2018.jy@cn.fujitsu.com 
> <mailto: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.
Yes. I only noticed header file place and forgot C file place.
> 
> -- 
> Regards,
> Li Wang