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

   1 /* Check that gettimeofday does not clobber errno.
   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 <stddef.h>
  21 #include <support/check.h>
  22 #include <sys/time.h>
  23
  24 static int
  25 do_test (void)
  26 {
  27   for (int original_errno = 0; original_errno < 2; ++original_errno)
  28     {
  29       errno = original_errno;
  30       struct timeval tv;
  31       gettimeofday (&tv, NULL);
  32       TEST_COMPARE (errno, original_errno);
  33     }
  34   return 0;
  35 }
  36
  37 #include <support/test-driver.c>