sysdeps/unix/sysv/linux/tst-clock_gettime-clobber.c

   1 /* Check that clock_gettime does not clobber errno on success.
   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 <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>