1  /* Test for timerfd related functions
       2     Copyright (C) 2021-2023 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 <errno.h>
      20  #include <intprops.h>
      21  #include <time.h>
      22  #include <support/check.h>
      23  #include <support/support.h>
      24  #include <support/xunistd.h>
      25  #include <support/timespec.h>
      26  #include <sys/time.h>
      27  #include <sys/timerfd.h>
      28  
      29  static void
      30  timerfd_test (void)
      31  {
      32    struct itimerspec settings = { { 0, 0 }, { 2, 0 } };
      33    struct itimerspec val;
      34    int fd, ret;
      35  
      36    fd = timerfd_create (CLOCK_REALTIME, 0);
      37    if (fd < 0)
      38      FAIL_EXIT1 ("*** timerfd_create failed: %m");
      39  
      40    /* Set the timer.  */
      41    ret = timerfd_settime (fd, 0, &settings, NULL);
      42    if (ret != 0)
      43      FAIL_EXIT1 ("*** timerfd_settime failed: %m\n");
      44  
      45    /* Sleep for 1 second.  */
      46    ret = usleep (1000000);
      47    if (ret != 0)
      48      FAIL_EXIT1 ("*** usleep failed: %m\n");
      49  
      50    /* Read the timer just after sleep.  */
      51    ret = timerfd_gettime (fd, &val);
      52    if (ret != 0)
      53      FAIL_EXIT1 ("*** timerfd_gettime failed: %m\n");
      54  
      55    /* Check difference between timerfd_gettime calls.  */
      56    TEST_COMPARE (support_timespec_check_in_range
      57                  ((struct timespec) { 1, 0 }, val.it_value, 0.9, 1.0), 1);
      58  
      59    xclose (fd);
      60  }
      61  
      62  static void
      63  timerfd_large_timeout (void)
      64  {
      65    int fd = timerfd_create (CLOCK_REALTIME, 0);
      66    TEST_VERIFY (fd != -1);
      67    support_create_timer (0, 100000000, false, NULL);
      68    struct itimerspec it = { { 0, 0 }, { TYPE_MAXIMUM (time_t), 0 } };
      69    int r = timerfd_settime (fd, 0, &it, NULL);
      70    if (r == 0)
      71      {
      72        uint64_t buf;
      73        TEST_COMPARE (read (fd, &buf, sizeof (buf)), -1);
      74        TEST_VERIFY (errno == EINTR);
      75      }
      76    else
      77      TEST_COMPARE (errno, EOVERFLOW);
      78  }
      79  
      80  static int
      81  do_test (void)
      82  {
      83    timerfd_test ();
      84    timerfd_large_timeout ();
      85    return 0;
      86  }
      87  
      88  #include <support/test-driver.c>