[v2] tst: Provide test for sched_rr_get_interval

  This change adds new test to assess sched_rr_get_interval's
functionality.

To be more specific - following use cases are checked:
- If the read interval is correct
- If the proper ABI is used - to check if adjacent data is not
  overwritten

---
Changes for v2:
- Move test execution from tests to xtests
- Use TEST_VERIFY_EXIT () macro instead of if () clause with FAIL_EXIT1 ()
---
 posix/Makefile                    |  2 +-
 posix/tst-sched_rr_get_interval.c | 45 +++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 posix/tst-sched_rr_get_interval.c
  

On Feb 08 2021, Lukasz Majewski wrote:

> diff --git a/posix/tst-sched_rr_get_interval.c b/posix/tst-sched_rr_get_interval.c
> new file mode 100644
> index 0000000000..d632e03655
> --- /dev/null
> +++ b/posix/tst-sched_rr_get_interval.c
> @@ -0,0 +1,45 @@
> +/* Test for sched_rr_get_interval
> +   Copyright (C) 2021 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#include <time.h>
> +#include <sched.h>
> +#include <support/check.h>
> +
> +static int
> +do_test (void)
> +{
> +  struct timespec ts[2] = { { -1, -1 }, { -1, -1 } };
> +  const struct sched_param param = {
> +    .sched_priority = sched_get_priority_max (SCHED_RR) - 10,
> +  };
> +  int result = sched_setscheduler (0, SCHED_RR, &param);
> +
> +  if (result != 0)
> +    FAIL_UNSUPPORTED ("*** sched_setscheduler error: %m\n");
> +
> +  TEST_COMPARE (sched_rr_get_internal (0, ts), 0);
> +
> +  /* Check if returned time values are correct.  */
> +  TEST_VERIFY_EXIT (ts[0].tv_sec < 0);
> +  TEST_VERIFY_EXIT (ts[0].tv_nsec < 0 || ts[0].tv_nsec >= 1000000000);
> +  TEST_VERIFY_EXIT (ts[1].tv_sec != -1 || ts[1].tv_nsec != -1);

There should be no need to exit immediately on failure.

Andreas.
  

Hi Andreas,

> On Feb 08 2021, Lukasz Majewski wrote:
> 
> > diff --git a/posix/tst-sched_rr_get_interval.c
> > b/posix/tst-sched_rr_get_interval.c new file mode 100644
> > index 0000000000..d632e03655
> > --- /dev/null
> > +++ b/posix/tst-sched_rr_get_interval.c
> > @@ -0,0 +1,45 @@
> > +/* Test for sched_rr_get_interval
> > +   Copyright (C) 2021 Free Software Foundation, Inc.
> > +   This file is part of the GNU C Library.
> > +
> > +   The GNU C Library is free software; you can redistribute it
> > and/or
> > +   modify it under the terms of the GNU Lesser General Public
> > +   License as published by the Free Software Foundation; either
> > +   version 2.1 of the License, or (at your option) any later
> > version. +
> > +   The GNU C Library is distributed in the hope that it will be
> > useful,
> > +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > GNU
> > +   Lesser General Public License for more details.
> > +
> > +   You should have received a copy of the GNU Lesser General Public
> > +   License along with the GNU C Library; if not, see
> > +   <https://www.gnu.org/licenses/>.  */
> > +
> > +#include <time.h>
> > +#include <sched.h>
> > +#include <support/check.h>
> > +
> > +static int
> > +do_test (void)
> > +{
> > +  struct timespec ts[2] = { { -1, -1 }, { -1, -1 } };
> > +  const struct sched_param param = {
> > +    .sched_priority = sched_get_priority_max (SCHED_RR) - 10,
> > +  };
> > +  int result = sched_setscheduler (0, SCHED_RR, &param);
> > +
> > +  if (result != 0)
> > +    FAIL_UNSUPPORTED ("*** sched_setscheduler error: %m\n");
> > +
> > +  TEST_COMPARE (sched_rr_get_internal (0, ts), 0);
> > +
> > +  /* Check if returned time values are correct.  */
> > +  TEST_VERIFY_EXIT (ts[0].tv_sec < 0);
> > +  TEST_VERIFY_EXIT (ts[0].tv_nsec < 0 || ts[0].tv_nsec >=
> > 1000000000);
> > +  TEST_VERIFY_EXIT (ts[1].tv_sec != -1 || ts[1].tv_nsec != -1);  
> 
> There should be no need to exit immediately on failure.

Could you elaborate this?

When the second allocated on stack struct timespec's fields are not
equal to -1, it means that wrong ABI was used and some values were
overwritten.

> 
> Andreas.
> 




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
  

Just carry on with the next test.  That way you see all failures, not
just the first one.

Andreas.