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/* Test gettimeofday function.
Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/time.h>
#include <time.h>
#include <support/check.h>
#include <support/test-driver.h>
/* Compare two struct timeval values, returning a value -1, 0 or 1. */
int
compare_timeval (const struct timeval *tv1, const struct timeval *tv2)
{
if (tv1->tv_sec < tv2->tv_sec)
return -1;
if (tv1->tv_sec > tv2->tv_sec)
return 1;
if (tv1->tv_usec < tv2->tv_usec)
return -1;
if (tv1->tv_usec > tv2->tv_usec)
return 1;
return 0;
}
int
do_test (void)
{
struct timeval tv1, tv2, tv3;
int ret;
time_t t1;
/* Verify that the calls to gettimeofday succeed, that the time does
not decrease, and that time returns a truncated (not rounded)
version of the time. */
t1 = time (NULL);
TEST_VERIFY_EXIT (t1 != (time_t) -1);
ret = gettimeofday (&tv1, NULL);
TEST_VERIFY_EXIT (ret == 0);
TEST_VERIFY (t1 <= tv1.tv_sec);
TEST_VERIFY (tv1.tv_usec >= 0);
TEST_VERIFY (tv1.tv_usec < 1000000);
ret = gettimeofday (&tv2, NULL);
TEST_VERIFY_EXIT (ret == 0);
TEST_VERIFY (compare_timeval (&tv1, &tv2) <= 0);
TEST_VERIFY (tv2.tv_usec >= 0);
TEST_VERIFY (tv2.tv_usec < 1000000);
/* Also verify that after sleeping, the time returned has increased.
Repeat several times to verify that each time, the time from the
time function is truncated not rounded. */
const struct timespec duration = { .tv_nsec = 100000000 };
for (int i = 0; i < 10; i++)
{
ret = nanosleep (&duration, NULL);
TEST_VERIFY_EXIT (ret == 0);
t1 = time (NULL);
TEST_VERIFY_EXIT (t1 != (time_t) -1);
ret = gettimeofday (&tv3, NULL);
TEST_VERIFY_EXIT (ret == 0);
TEST_VERIFY (compare_timeval (&tv2, &tv3) < 0);
TEST_VERIFY (t1 <= tv3.tv_sec);
TEST_VERIFY (tv3.tv_usec >= 0);
TEST_VERIFY (tv3.tv_usec < 1000000);
tv2 = tv3;
}
/* Also test with the obsolete tz argument not being NULL. */
struct timezone tz = { 0 };
t1 = time (NULL);
TEST_VERIFY_EXIT (t1 != (time_t) -1);
ret = gettimeofday (&tv3, &tz);
TEST_VERIFY_EXIT (ret == 0);
TEST_VERIFY (t1 <= tv3.tv_sec);
TEST_VERIFY (compare_timeval (&tv2, &tv3) <= 0);
TEST_VERIFY (tv3.tv_usec >= 0);
TEST_VERIFY (tv3.tv_usec < 1000000);
return 0;
}
#include <support/test-driver.c>
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