sysdeps/unix/sysv/linux/tst-ppoll.c

   1 /* Test for ppoll timeout
   2    Copyright (C) 2021-2024 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 <poll.h>
  21 #include <errno.h>
  22 #include <intprops.h>
  23 #include <support/check.h>
  24 #include <support/xtime.h>
  25 #include <support/timespec.h>
  26 #include <support/support.h>
  27 #include <stdbool.h>
  28
  29 static int test_ppoll_timeout (bool zero_tmo)
  30 {
  31   /* We wait for half a second.  */
  32   struct timespec ts;
  33   xclock_gettime (CLOCK_REALTIME, &ts);
  34   struct timespec timeout = make_timespec (0, zero_tmo ? 0 : TIMESPEC_HZ/2);
  35   ts = timespec_add (ts, timeout);
  36
  37   /* Ignore fds - just wait for timeout.  */
  38   struct pollfd fds = { -1, 0, 0 };
  39   TEST_COMPARE (ppoll (&fds, 1, &timeout, 0), 0);
  40
  41   TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts);
  42
  43   return 0;
  44 }
  45
  46 static void
  47 test_ppoll_large_timeout (void)
  48 {
  49   support_create_timer (0, 100000000, false, NULL);
  50   struct timespec ts = { TYPE_MAXIMUM (time_t), 0 };
  51   struct pollfd fds = { -1, 0, 0 };
  52   TEST_COMPARE (ppoll (&fds, 1, &ts, 0), -1);
  53   TEST_VERIFY (errno == EINTR || errno == EOVERFLOW);
  54 }
  55
  56 static int
  57 do_test (void)
  58 {
  59   /* Check if ppoll exits immediately.  */
  60   test_ppoll_timeout (true);
  61
  62   /* Check if ppoll exits after specified timeout.  */
  63   test_ppoll_timeout (false);
  64
  65   /* Check if ppoll with large timeout.  */
  66   test_ppoll_large_timeout ();
  67
  68   return 0;
  69 }
  70
  71 #include <support/test-driver.c>