tst: Add test for settimeofday

  This code brings test to check if time on target machine is properly set.
To avoid any issues with altering the time:

- The time, which was set before the test was executed is restored.

- The time is altered only when cross-test-ssh.sh is executed with
  --allow-time-setting flag
---
 time/Makefile           |  2 +-
 time/tst-settimeofday.c | 52 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 time/tst-settimeofday.c
  

On 07/03/2021 09:59, Lukasz Majewski wrote:
> This code brings test to check if time on target machine is properly set.
> To avoid any issues with altering the time:
> 
> - The time, which was set before the test was executed is restored.
> 
> - The time is altered only when cross-test-ssh.sh is executed with
>   --allow-time-setting flag

Ok with the changes below.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

> ---
>  time/Makefile           |  2 +-
>  time/tst-settimeofday.c | 52 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 53 insertions(+), 1 deletion(-)
>  create mode 100644 time/tst-settimeofday.c
> 
> diff --git a/time/Makefile b/time/Makefile
> index 414721ecc5..acfd08ef36 100644
> --- a/time/Makefile
> +++ b/time/Makefile
> @@ -49,7 +49,7 @@ tests	:= test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
>  	   tst-tzname tst-y2039 bug-mktime4 tst-strftime2 tst-strftime3 \
>  	   tst-clock tst-clock2 tst-clock_nanosleep tst-cpuclock1 \
>  	   tst-adjtime tst-ctime tst-difftime tst-mktime4 tst-clock_settime \
> -	   tst-itimer tst-gmtime tst-timegm tst-timespec_get
> +	   tst-itimer tst-gmtime tst-timegm tst-timespec_get tst-settimeofday
>  
>  tests-time64 := \
>    tst-adjtime-time64 \

Ok.

> diff --git a/time/tst-settimeofday.c b/time/tst-settimeofday.c
> new file mode 100644
> index 0000000000..6d0f936a15
> --- /dev/null
> +++ b/time/tst-settimeofday.c
> @@ -0,0 +1,52 @@
> +/* Test for settimeofday
> +   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/xtime.h>
> +
> +#define TIMESPEC_SEC_Y2038_OV 0x7FFFFFFF
> +#define FUTURE_TIME (TIMESPEC_SEC_Y2038_OV - 10)
> +
> +static int
> +do_test (void)
> +{
> +  const struct timeval tv = { FUTURE_TIME, 0};
> +  struct timespec tv_future, tv_now;
> +
> +  /* Check if altering target time is allowed.  */
> +  if (getenv (SETTIME_ENV_NAME) == NULL)
> +    FAIL_UNSUPPORTED ("settimeofday is executed only when "\
> +                      SETTIME_ENV_NAME" is set\n");
> +
> +  tv_now = xclock_now(CLOCK_REALTIME);
> +  settimeofday(&tv, NULL);
> +  tv_future = xclock_now(CLOCK_REALTIME);

Missing space after '(' and check settimeofday return value.

> +
> +  /* Restore old time value on target machine.  */
> +  xclock_settime(CLOCK_REALTIME, (const struct timespec*) &tv_now);

Missing space after '('.

> +
> +  if (tv_future.tv_sec < tv.tv_sec)
> +    FAIL_EXIT1 ("settimeofday set wrong time!\n");
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>
>