1  /* Copyright (C) 2003-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <stdio.h>
      20  #include <unistd.h>
      21  #include <sys/time.h>
      22  #include <time.h>
      23  #include <intprops.h>
      24  #include <support/support.h>
      25  #include <support/check.h>
      26  
      27  /* Test that clock_nanosleep() does sleep.  */
      28  static void
      29  clock_nanosleep_test (void)
      30  {
      31    /* Current time.  */
      32    struct timeval tv1;
      33    gettimeofday (&tv1, NULL);
      34  
      35    struct timespec ts = { 1, 0 };
      36    TEMP_FAILURE_RETRY (clock_nanosleep (CLOCK_REALTIME, 0, &ts, &ts));
      37  
      38    /* At least one second must have passed.  */
      39    struct timeval tv2;
      40    gettimeofday (&tv2, NULL);
      41  
      42    tv2.tv_sec -= tv1.tv_sec;
      43    tv2.tv_usec -= tv1.tv_usec;
      44    if (tv2.tv_usec < 0)
      45      --tv2.tv_sec;
      46  
      47    TEST_VERIFY (tv2.tv_sec >= 1);
      48  }
      49  
      50  static void
      51  clock_nanosleep_large_timeout (void)
      52  {
      53    support_create_timer (0, 100000000, false, NULL);
      54    struct timespec ts = { TYPE_MAXIMUM (time_t), 0 };
      55    int r = clock_nanosleep (CLOCK_REALTIME, 0, &ts, NULL);
      56    TEST_VERIFY (r == EINTR || r == EOVERFLOW);
      57  }
      58  
      59  static int
      60  do_test (void)
      61  {
      62    clock_nanosleep_test ();
      63    clock_nanosleep_large_timeout ();
      64    return 0;
      65  }
      66  
      67  #include <support/test-driver.c>