posix/tst-sched_rr_get_interval.c

   1 /* Test for sched_rr_get_interval
   2    Copyright (C) 2021-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <time.h>
  20 #include <sched.h>
  21 #include <support/check.h>
  22
  23 static int
  24 do_test (void)
  25 {
  26   struct timespec ts[2] = { { -1, -1 }, { -1, -1 } };
  27   const struct sched_param param = {
  28     .sched_priority = sched_get_priority_max (SCHED_RR) - 10,
  29   };
  30   int result = sched_setscheduler (0, SCHED_RR, &param);
  31
  32   if (result != 0)
  33     FAIL_UNSUPPORTED ("sched_setscheduler error: %m\n");
  34
  35   TEST_COMPARE (sched_rr_get_interval (0, ts), 0);
  36
  37   /* Check if returned time values are correct.  */
  38   TEST_VERIFY (ts[0].tv_sec >= 0);
  39   TEST_VERIFY (ts[0].tv_nsec >= 0 && ts[0].tv_nsec < 1000000000);
  40   TEST_VERIFY (ts[1].tv_sec == -1 && ts[1].tv_nsec == -1);
  41
  42   return 0;
  43 }
  44
  45 #include <support/test-driver.c>