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tst: Add test for clock_adjtime

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This code privides test to check if time on target machine is properly
adjusted.
The time is altered only when cross-test-ssh.sh is executed with
--allow-time-setting flag.
As the delta added to CLOCK_REALTIME is only 1 sec the original time is
not restored and further tests are executed with this bias.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski 2021-01-20 12:10:42 +01:00
parent 3f337843ec
commit b4effffde8
2 changed files with 59 additions and 1 deletions
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3
sysdeps/unix/sysv/linux/Makefile
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@ -107,7 +107,8 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
test-errno-linux tst-memfd_create tst-mlock2 tst-pkey \
tst-rlimit-infinity tst-ofdlocks tst-gettid tst-gettid-kill \
tst-tgkill tst-sysvsem-linux tst-sysvmsg-linux tst-sysvshm-linux \
tst-timerfd tst-ppoll tst-futimens tst-utime tst-utimes
tst-timerfd tst-ppoll tst-futimens tst-utime tst-utimes \
tst-clock_adjtime
tests-internal += tst-ofdlocks-compat tst-sigcontext-get_pc
CFLAGS-tst-sigcontext-get_pc.c = -fasynchronous-unwind-tables

57
sysdeps/unix/sysv/linux/tst-clock_adjtime.c Normal file
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@ -0,0 +1,57 @@
/* Test for clock_adjtime
Copyright (C) 2021 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 <time.h>
#include <stdlib.h>
#include <sys/time.h>
#include <support/check.h>
#include <support/timespec.h>
static int
do_test (void)
{
struct timespec tv_then, tv_now;
struct timex delta;
/* Check if altering target time is allowed. */
if (getenv (SETTIME_ENV_NAME) == NULL)
FAIL_UNSUPPORTED ("clock_adjtime is executed only when "\
SETTIME_ENV_NAME" is set\n");
tv_then = xclock_now (CLOCK_REALTIME);
/* Setup time value to adjust - 1 sec. */
delta.time.tv_sec = 1;
delta.time.tv_usec = 0;
delta.modes = ADJ_SETOFFSET;
int ret = clock_adjtime (CLOCK_REALTIME, &delta);
if (ret == -1)
FAIL_EXIT1 ("clock_adjtime failed: %m\n");
tv_now = xclock_now (CLOCK_REALTIME);
/* Check if clock_adjtime adjusted the system time. */
struct timespec r = timespec_sub (tv_now, tv_then);
TEST_COMPARE (support_timespec_check_in_range
((struct timespec) { 1, 0 }, r, 0.9, 1.1), 1);
return 0;
}
#include <support/test-driver.c>