time/tst-settimeofday.c

   1 /* Test for settimeofday
   2    Copyright (C) 2021 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 <time.h>
  20 #include <stdlib.h>
  21 #include <sys/time.h>
  22 #include <support/check.h>
  23 #include <support/xtime.h>
  24
  25 #define TIMESPEC_SEC_Y2038_OV 0x7FFFFFFF
  26 #define FUTURE_TIME (TIMESPEC_SEC_Y2038_OV - 10)
  27
  28 static int
  29 do_test (void)
  30 {
  31   const struct timeval tv = { FUTURE_TIME, 0};
  32   struct timespec tv_future, tv_now;
  33
  34   /* Check if altering target time is allowed.  */
  35   if (getenv (SETTIME_ENV_NAME) == NULL)
  36     FAIL_UNSUPPORTED ("settimeofday is executed only when "\
  37                       SETTIME_ENV_NAME" is set\n");
  38
  39   tv_now = xclock_now (CLOCK_REALTIME);
  40   int ret = settimeofday (&tv, NULL);
  41   if (ret == -1)
  42     FAIL_EXIT1 ("settimeofday failed: %m\n");
  43
  44   tv_future = xclock_now (CLOCK_REALTIME);
  45
  46   /* Restore old time value on target machine.  */
  47   xclock_settime (CLOCK_REALTIME, (const struct timespec*) &tv_now);
  48
  49   if (tv_future.tv_sec < tv.tv_sec)
  50     FAIL_EXIT1 ("settimeofday set wrong time!\n");
  51
  52   return 0;
  53 }
  54
  55 #include <support/test-driver.c>