[LTP] [PATCH v3] io_submit04: Add test case for RWF_NOWAIT flag

[Petr Vorel]

Hi all,

...
> > > +static void run(void)
> > > +{
> > > +	struct io_event evbuf;
> > > +	struct timespec timeout = { .tv_sec = 1 };
> > > +	long nr = 1;
> > > +
> > > +	TEST(tst_syscall(__NR_io_submit, ctx, nr, iocbs));
> > > +
> > > +	if (TST_RET == nr)
> > > +		tst_res(TPASS, "io_submit() pass");
> > > +	else
> > > +		tst_res(TFAIL | TTERRNO, "io_submit() returns %ld, expected %ld", TST_RET, nr);

> > Our goal is to verify that io_getevents() returns EAGAIN, so we can just:

> > if (TST_RET != nr) {
> > 	tst_res(TBROK | TTERRNO, "io_submit() returns %ld, expected %ld", TST_RET, nr);
> > 	return;
> > }

> > We return because if io_submit() fails there's nothing to do more.
> tst_res(TBROK will trigger error such as :
> make[1]: Leaving directory '/home/wegao/ltp/lib'
> In file included from ../../../../include/tst_test.h:20,
>                  from io_submit04.c:14:
> io_submit04.c: In function ‘run’:
> ../../../../include/tst_common.h:80:32: error: size of unnamed array is negative
>    80 |         do { ((void)sizeof(char[1 - 2 * !!(condition)])); } while (0)
>       |                                ^
> ../../../../include/tst_common.h:83:9: note: in expansion of macro ‘TST_BUILD_BUG_ON’
>    83 |         TST_BUILD_BUG_ON(condition)
>       |         ^~~~~~~~~~~~~~~~
> ../../../../include/tst_test.h:71:17: note: in expansion of macro ‘TST_RES_SUPPORTS_TCONF_TDEBUG_TFAIL_TINFO_TPASS_TWARN’
>    71 |                 TST_RES_SUPPORTS_TCONF_TDEBUG_TFAIL_TINFO_TPASS_TWARN(\
>       |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> io_submit04.c:63:17: note: in expansion of macro ‘tst_res’
>    63 |                 tst_res(TBROK | TTERRNO, "io_submit() returns %ld, expected %ld",
>       |                 ^~~~~~~
> make: *** [../../../../include/mk/rules.mk:48: io_submit04] Error 1
> -bash: ./io_submit04: No such file or directory

> So i suppose we need use "tst_brk(TBROK" without return, correct?

Yes, that's a macro which enforces using TBROK only with tst_brk().

@Cyril @Li @Jan I wonder if we still need this enforcement after Cyril's change
a1f82704c2 ("lib/tst_test.c: Fix tst_brk() handling")

Kind regards,
Petr