[LTP] [RFC] syscalls/ipc: Make use of TST_EXP_FAIL macro

[xuyang2018.jy@fujitsu.com <xuyang2018.jy@fujitsu.com>]

Hi Cyril
> Hi!
>> Since TST_EXP_FAIL macro only recognizes sycalls succeeded when syscalls return 0,
>> Can we use this macro directly for the these syscalls's error test? It may result in
>> invalid retval value and print errno when syscall succeeded. I think it
>> is a nit and it can improve this api usage range. Is it right?
>
> I guess that it would be slightly cleaner to add more generic macro that
> allows us to pass the condition for succeess and build TST_EXP_FAIL() on
> the top of that. Maybe something as:
>
> diff --git a/include/tst_test_macros.h b/include/tst_test_macros.h
> index 89dfe5a31..4d41741a4 100644
> --- a/include/tst_test_macros.h
> +++ b/include/tst_test_macros.h
> @@ -120,13 +120,13 @@ extern void *TST_RET_PTR;
>                          TST_MSG_(TPASS, " passed", #SCALL, ##__VA_ARGS__);     \
>          } while (0)                                                            \
>
> -#define TST_EXP_FAIL(SCALL, ERRNO, ...)                                        \
> +#define TST_EXP_FAIL_(PASS_COND, SCALL, ERRNO, ...)                            \
>          do {                                                                   \
>                  TEST(SCALL);                                                   \
>                                                                                 \
>                  TST_PASS = 0;                                                  \
>                                                                                 \
> -               if (TST_RET == 0) {                                            \
> +               if (PASS_COND) {                                               \
>                          TST_MSG_(TFAIL, " succeeded", #SCALL, ##__VA_ARGS__);  \
>                          break;                                                 \
>                  }                                                              \
> @@ -150,4 +150,8 @@ extern void *TST_RET_PTR;
>                  }                                                              \
>          } while (0)
>
> +#define TST_EXP_FAIL(SCALL, ERRNO, ...) TST_EXP_FAIL_(TST_RET == 0, SCALL, ERRNO)
> +
> +#define TST_EXP_FAIL2(SCALL, ERRNO, ...) TST_EXP_FAIL_(TST_RET>= 0, SCALL, ERRNO)
> +
>   #endif /* TST_TEST_MACROS_H__ */
>
> The only hard thing is to find a good name for TST_EXP_FAIL2(), I'm out
> of ideas here...
I think using TST_EXP_FAIL2 directly is simple and clear.

Best Regards
Yang Xu
>