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tst: Add test for ntp_gettime 

This code provides test to check if time on target machine is properly
read via ntp_gettime syscall.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski 2021-03-09 11:33:34 +01:00
parent 3989bcb5e3
commit c0c926d00d
2 changed files with 57 additions and 1 deletions
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2
sysdeps/unix/sysv/linux/Makefile
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@ -108,7 +108,7 @@ tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
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-clock_adjtime tst-adjtimex tst-ntp_adjtime
tst-clock_adjtime tst-adjtimex tst-ntp_adjtime tst-ntp_gettime
# Test for the symbol version of fcntl that was replaced in glibc 2.28.
ifeq ($(have-GLIBC_2.27)$(build-shared),yesyes)

56
sysdeps/unix/sysv/linux/tst-ntp_gettime.c Normal file
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@ -0,0 +1,56 @@
/* Test for ntp_gettime.
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/timex.h>
#include <support/check.h>
#include <support/xtime.h>
#ifndef NTP_GETTIME_SYSCALL
# define NTP_GETTIME_SYSCALL ntp_gettime
#endif
#define STR(__s) #__s
static int
do_test (void)
{
struct timespec tv_before_ntp, tv_after_ntp;
struct ntptimeval ntv;
/* To prevent seconds rollover (which is very unlikely though),
loop until we do match seconds values before and after
call to ntp_gettime. */
do
{
tv_before_ntp = xclock_now (CLOCK_REALTIME);
int ret = NTP_GETTIME_SYSCALL (&ntv);
if (ret == -1)
FAIL_EXIT1 (STR(NTP_GETTIME_SYSCALL)" failed: %m\n");
tv_after_ntp = xclock_now (CLOCK_REALTIME);
}
while (tv_after_ntp.tv_sec != tv_before_ntp.tv_sec);
TEST_COMPARE (tv_after_ntp.tv_sec, ntv.time.tv_sec);
return 0;
}
#include <support/test-driver.c>