1  /* Check that clock_gettime does not clobber errno on success.
       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 <time.h>
      21  #include <support/check.h>
      22  #include <stdio.h>
      23  
      24  static void
      25  test_clock (clockid_t clk)
      26  {
      27    printf ("info: testing clock: %d\n", (int) clk);
      28  
      29    for (int original_errno = 0; original_errno < 2; ++original_errno)
      30      {
      31        errno = original_errno;
      32        struct timespec ts;
      33        if (clock_gettime (clk, &ts) == 0)
      34          TEST_COMPARE (errno, original_errno);
      35      }
      36  }
      37  
      38  static int
      39  do_test (void)
      40  {
      41    test_clock (CLOCK_BOOTTIME);
      42    test_clock (CLOCK_BOOTTIME_ALARM);
      43    test_clock (CLOCK_MONOTONIC);
      44    test_clock (CLOCK_MONOTONIC_COARSE);
      45    test_clock (CLOCK_MONOTONIC_RAW);
      46    test_clock (CLOCK_PROCESS_CPUTIME_ID);
      47    test_clock (CLOCK_REALTIME);
      48    test_clock (CLOCK_REALTIME_ALARM);
      49    test_clock (CLOCK_REALTIME_COARSE);
      50  #ifdef CLOCK_TAI
      51    test_clock (CLOCK_TAI);
      52  #endif
      53    test_clock (CLOCK_THREAD_CPUTIME_ID);
      54    return 0;
      55  }
      56  
      57  #include <support/test-driver.c>