Dear community,

> This code provides test to check if time on target machine is properly
> read via ntp_gettime syscall.
> 
> ---
> Changes for v2:
> - Check time before and after calling ntp_gettime{x} to avoid
> situation when seconds rollover between call to ntp_gettime and
> wrapper providing current time.

Are there any more comments regarding v2 of this patch?

Is it ready for submission?

> ---
>  sysdeps/unix/sysv/linux/Makefile          |  2 +-
>  sysdeps/unix/sysv/linux/tst-ntp_gettime.c | 56
> +++++++++++++++++++++++ 2 files changed, 57 insertions(+), 1
> deletion(-) create mode 100644
> sysdeps/unix/sysv/linux/tst-ntp_gettime.c
> 
> diff --git a/sysdeps/unix/sysv/linux/Makefile
> b/sysdeps/unix/sysv/linux/Makefile index b8c1caa505..8a07870cb4 100644
> --- a/sysdeps/unix/sysv/linux/Makefile
> +++ b/sysdeps/unix/sysv/linux/Makefile
> @@ -113,7 +113,7 @@ tests += tst-clone tst-clone2 tst-clone3
> tst-fanotify tst-personality \ 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-futimes \
> -	 tst-lutimes
> +	 tst-lutimes tst-ntp_gettime
>  tests-internal += tst-ofdlocks-compat tst-sigcontext-get_pc
>  tests-time64 += \
>    tst-futimes-time64\
> diff --git a/sysdeps/unix/sysv/linux/tst-ntp_gettime.c
> b/sysdeps/unix/sysv/linux/tst-ntp_gettime.c new file mode 100644
> index 0000000000..6cd3a0ec2c
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/tst-ntp_gettime.c
> @@ -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);
> +
> +  if (tv_after_ntp.tv_sec != ntv.time.tv_sec)
> +    FAIL_EXIT1 (STR(NTP_GETTIME_SYSCALL)" provided wrong time!\n");
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>




Best regards,

Lukasz Majewski

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